CA1262257A - Method and system for operating power converter system - Google Patents
Method and system for operating power converter systemInfo
- Publication number
- CA1262257A CA1262257A CA000511104A CA511104A CA1262257A CA 1262257 A CA1262257 A CA 1262257A CA 000511104 A CA000511104 A CA 000511104A CA 511104 A CA511104 A CA 511104A CA 1262257 A CA1262257 A CA 1262257A
- Authority
- CA
- Canada
- Prior art keywords
- bus line
- power
- power converter
- breaker
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/75—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/757—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
- H02M7/7575—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only for high voltage direct transmission link
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
ABSTRACT OF THE DISCLOSURE
A synchronous condenser is provided on an AC bus line which is connected to an AC power system via a circuit breaker. The AC bus line and a DC bus line are connected via a power converter system. In such a system, if three conditions: the breaker is opened; the synchronous condenser is under operation; and the power converter operates as an inverter, are met, the power converter is driven into a zero power factor operation, i.e., an operation to cancel a capacitive reactive power on the AC bus line including AC filters in order to prevent the synchronous condenser self-excitation.
A synchronous condenser is provided on an AC bus line which is connected to an AC power system via a circuit breaker. The AC bus line and a DC bus line are connected via a power converter system. In such a system, if three conditions: the breaker is opened; the synchronous condenser is under operation; and the power converter operates as an inverter, are met, the power converter is driven into a zero power factor operation, i.e., an operation to cancel a capacitive reactive power on the AC bus line including AC filters in order to prevent the synchronous condenser self-excitation.
Description
BACKGROUND OF THE INVENTION
Field of the Invention . . .
The present invention relates to a method and a sys-tem for operating a power converter system.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a block diagram of a power converter system according to an embodiment of the present invention; and Figure 2 is a block diagram of a conventional power converter system.
Technical B~ckground of the Invention and its Problems Figure 2 is a block diagram showing an example of a power converter system for power transmission. AC bus lines 1,1' are connected via transformers 2, 2' to power converters 3, 3' constructed of, e.g., plural thyris-tors connected in series or parallel. By controlling the firing phase of the converter, AC current is converted into DC current or vice versa. The system also includes reactors 4, ~', DC power transmission lines 5, potential transformers (P.T.) 6, 6', and current transformers (C.T,) 7, 7'. The control circuit for the power converter system is constructed of automatic current regulators (ACR) 8, 8', con-stan-t margin angle regulator (CER) 9, 9', and the like.
Besides the automatic current regulators 8, 8' and the constant margin angle regulator 9, 9', an automatic voltage regulator (AVR) and the like may be provided for maintaining the DC voltage constant. Calculated values by the automa-tic cur-rent regulators 8, 8' and the constant margin angle regulators 9, 9' are inputted as control votages (Ec) to minimum value .`'i, "~:
~L~ t;~ 3~
-la- 20375-558 selection circuits (LVG) 10, 10' automatically selecting a control voltage which leads the control angle of the system to the smallest~ The selected control voltages are limited by control voltage .limiter circuits (EcL) 11, 11' respectively and are inputted to ;phase control circuits (PCC~ 12, 12' which output firirlg pulses to -the thyristors by determin.ing firing phases corresponding to the selected control vol-tages. As well known, in the power converter system constructed as above, one of the converters opera-tes as a rectifier under constant current ~ ~ti~ ~l7 control while the other oE the converters operates under constant margin angle control, by switching a current margin (I~.
When a fault occurs in the converters or AC power systemsr signals a~ a' or b, b' are applied from protection units (PU) 13r 13 I to the phase control circuits 12 r 12' respectively for protection of the converters. The signals ar a' are used for a bypass pair operationr while the signals br b' are used for a gate blocking operation. Generally the converters are protected by the ~ypass pair operation or the gate blocking operation.
Alsor the power converters 3, 3' require a reactive power during their operations. Thereforer it is common to provide AC filters 14r 14' for removing harmonics and a synchronous conden~er 15 for supplying a reactive power. Reference numerals 16, 16' designate the AC power - systems, and reference numerals 17r 17' designate circuit breakers.
For convenience of descriptionr it is assumed that the converter 3 of Fig. 2 works as inverter and the converter 3' wo~rks as rectifier.
~hen a fault occurs in the AC bus line 1 of the sy~tem, it is common to protect the system by opening the breaker near the ~ault point. However, while the converter 3 in the power converter system works as inverter and the inverter operation continues with the breaker 17 at the AC power system opened, energy is fed to the filter 14 from the DC system so that an excessive voltage is generated on the AC bus line. Further, if the converter 3 is stopped by a gate blocking operation to prevent energy from the DC system, there arises a risk of generating an excessive voltage on the ~C bus line as well as a risk of self excitation phenomenon of the synchronous condenser 15 to accordingly generate an excessive voltage on the AC bus line 1 because the converter 3 does not consume a reactive power.
-3- 20-~65-558 Furthermore, even i~ the converter 3 is driven into a bypass pair operation, the converter 3 does not consume a reactive power as in the case of a ga-te blocking operation.
Thus, the synchronous condenser 15 is subjected to a self excitation phenomenon to make the AC bus line have an excessive voltage. Since non-conductive valves of the converter 3 under the bypass pair operation are applied with line voltages, exces-sive voltages are applied to the non-conductive valves, resulting in a possibility of breakdown of the power conver~er system.
SUMMARY OF T~E INVENTIO~
.
In view of the above-described problems, an object of the present invention is to provide a method and a system for operating a power converter system without generating an excessive voltage.
To achieve the above object.of the present invention, in a power converter connected to an AC power system provided with a synchronous condenser, if the power converter works as inverter while the synchronous condenser operates and a circuit breaker connected to the AC power system is opened to make the converter station load capacitive, then the power con-verter is driven in a zero power factor operation to consume a reactive power so that no energy from a DC system is received by the AC power system and an excessive voltage on the AC bus is prevented. Further, if the power converter works as rectifier, the operation may continue as it is to consume a reactive power and prevent an excessive voltage.
~ j7 -3a- 20375-55g rrhus~ in accordance with a broad aspect of the invention there is provided a method for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line provided with a snychronous condenser and connected to an AC power system through a breaker, comprising the steps of:
detecting whether or not said breaker is opened;
detecting whether or not said synchronous condenser is under operation;
detecting whether or not said power converter works as inverter; and driving said power converter at a firing angle cancelling a capacitive reactive power of said AC bus line when said breaker is opened, said synchronous condenser is under operation, and said power converter works as inverter.
In accordance with another broad aspect of the invention, there is provided a system for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line provided with a synchronous condenser 0 and connected to an AC power system through a breaker comprising:
first means for generating a second signal while said breaker is opened;
second means for generating a second signal while said synchronous condenser is under operation;
third means for generating a third signal ~hile said power converter works as inverter; and ., .
j 7 -3b- 20375-558 control means for driving said power converter a-t a predetermined firing angle upon reception of said first, second and third signals thereby cons~ming on said AC bus line a reactive po~er sufficient for cancelling a capaci-tive reactive power of said AC bus line.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The embodiment of the present invention will now be described with reference to Figure 1 wherein similar ,~ .
, .~ ~...
~ 7 elements to those in Fig. 2 are designated by the same reference numerals and the description therefor is omitted~ Reference numerals 18 to 21 represent AND
gates, reference numeral 22 represents an inverter, 23 a S firing angle setting device, 24 a switch, d a synchronous condenser status signal, and c a status signal of the circuit breaker 17. Signal INV indicates that the converter 3 operates as inverter, and signal f is a zero power factor operation command.
During an ordinary operation the breaker 17 is closed. Therefore, the signal c is "0" and hence the signal _ is "0" so that the converter 3 operates without incorporating a zero power fackor operation. Assume that the breaker 17 is opened during operation of the synchornous condenser 15. In this case, the signal d is "1" under operation of the synchronous condenser 15.
When the breaker 17 is opened, the signal c also becomes "1" to make the output signal e of the AND gate 18 "1".
In addition~ when the converter 3 works as inverter, the signal INV beomes "1". As a result, the output f of the AND gate 19 becomes "1" to close the switch 24 and input a firing angle set by the firing angle setting device 23 to the minimum value selection circuit 10. The firing angle is set at about 90 degrees. Since the output Z5 angles of the automatic current regulator 8 and the constant maryin angle circuit 9 are larger than 90 degre~s, the minimum value selection circuit 10 selects an input from the firing angle setting device ~3 and outputs it. As a result, the firing angle of the converter 3 becomes about 90 degrees to start a zero power factor operation consuming a substantial reactive power. Since the converter 3 is driven into a zero power factor operation and current continues to flow in the DC
system, there is no possibility of an excessive voltage.
In addition, since no energy is fed from the DC system to the AC system, an excessive voltage on the AC bus line, which might be caused by energy from the DC power system, 5 ~
does not occur. Further, since the converter 3 consumes a reactive power during its operation, the synchronous condenser 15 is not subject to the self excitation phenomenon and the AC bus line 1 does not generate an excessive voltage. The DC current under a zero power factor operation is needed to be set such that the converter 3 consumes a reactive power corresponding to the capacitive reactive power on the AC bus line including AC filters 14. If the DC current is set too small, an excessive voltage on the AC bus line 1 may occur. On the other hand, if the DC current is set too large, the voltage at the AC bus line is lowered, resulting in a possibility of commutation failure of the converter 3.
If the converter 3 works as rectifier, energy is not fed from the DC system to the AC system so that the rectifier operation may be continued. In this case, since the signal INV becomes "0", the zero power factor operation command f also becomes "0" so that the zero power factor operation does not occur and the reactive power is consumed and an excessive voltage is suppressed under the continued rectifier operation. Similar to the case of the zero power factor inverter operation, it i5 necessary to ~et the DC current so as to correspond to the capacitive reactive power on the AC bus.
Signal a represents a bypass pair command for the converter 3, and signal b represents a gate blocking signal for the converter 3. The signal f passing through the inverter 22 and the bypass pair command a are inputted to the AND gate 20 so as to block the bypass pair command a when the breaker 17 is opened during operation of the synchronous condenser 15. Thus, the converter 3 does not driven into a bypass pair operation.
Similarly, the signal r passing through the inverter 22 and the gate blocking signal b are inputted to the AND
gate 21 so as to block the gate blocking signal b when the breaker 17 is opened while the synchronous condenser 15 operates. Thus, the converter 3 is not subjected to gate blocking. The AND gates 20 and 21 are provided for the purpose of continuing the consumption of the reactive power by the converter.
If the synchronous condenser 15 is not under operation, the signal f remains "0" even i the breaker is opened, resulting in a "1" output of the inverter 22.
Therefore, the bypass pair command a or the gate blocking signal b from the protection unit 13 is not blocked by the AND gate 20 or 21. Consequently, if the sign~l a or b is "1", then the signal q or h becomes "1" to start the bypass pair operation or the gate blocking opexation by the phase control circuit 12.
AS seen from the foregoing description of the invention, it is possible to provide a method for operating the power converte~ system in which, even if the circuit breaker to the AC system is opened while the synchronous condenser operates, an excessive voltage by the self excitation of the synchronous condenser or an excessive voltage by energy fed from the AC power system, does not occur.
Field of the Invention . . .
The present invention relates to a method and a sys-tem for operating a power converter system.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a block diagram of a power converter system according to an embodiment of the present invention; and Figure 2 is a block diagram of a conventional power converter system.
Technical B~ckground of the Invention and its Problems Figure 2 is a block diagram showing an example of a power converter system for power transmission. AC bus lines 1,1' are connected via transformers 2, 2' to power converters 3, 3' constructed of, e.g., plural thyris-tors connected in series or parallel. By controlling the firing phase of the converter, AC current is converted into DC current or vice versa. The system also includes reactors 4, ~', DC power transmission lines 5, potential transformers (P.T.) 6, 6', and current transformers (C.T,) 7, 7'. The control circuit for the power converter system is constructed of automatic current regulators (ACR) 8, 8', con-stan-t margin angle regulator (CER) 9, 9', and the like.
Besides the automatic current regulators 8, 8' and the constant margin angle regulator 9, 9', an automatic voltage regulator (AVR) and the like may be provided for maintaining the DC voltage constant. Calculated values by the automa-tic cur-rent regulators 8, 8' and the constant margin angle regulators 9, 9' are inputted as control votages (Ec) to minimum value .`'i, "~:
~L~ t;~ 3~
-la- 20375-558 selection circuits (LVG) 10, 10' automatically selecting a control voltage which leads the control angle of the system to the smallest~ The selected control voltages are limited by control voltage .limiter circuits (EcL) 11, 11' respectively and are inputted to ;phase control circuits (PCC~ 12, 12' which output firirlg pulses to -the thyristors by determin.ing firing phases corresponding to the selected control vol-tages. As well known, in the power converter system constructed as above, one of the converters opera-tes as a rectifier under constant current ~ ~ti~ ~l7 control while the other oE the converters operates under constant margin angle control, by switching a current margin (I~.
When a fault occurs in the converters or AC power systemsr signals a~ a' or b, b' are applied from protection units (PU) 13r 13 I to the phase control circuits 12 r 12' respectively for protection of the converters. The signals ar a' are used for a bypass pair operationr while the signals br b' are used for a gate blocking operation. Generally the converters are protected by the ~ypass pair operation or the gate blocking operation.
Alsor the power converters 3, 3' require a reactive power during their operations. Thereforer it is common to provide AC filters 14r 14' for removing harmonics and a synchronous conden~er 15 for supplying a reactive power. Reference numerals 16, 16' designate the AC power - systems, and reference numerals 17r 17' designate circuit breakers.
For convenience of descriptionr it is assumed that the converter 3 of Fig. 2 works as inverter and the converter 3' wo~rks as rectifier.
~hen a fault occurs in the AC bus line 1 of the sy~tem, it is common to protect the system by opening the breaker near the ~ault point. However, while the converter 3 in the power converter system works as inverter and the inverter operation continues with the breaker 17 at the AC power system opened, energy is fed to the filter 14 from the DC system so that an excessive voltage is generated on the AC bus line. Further, if the converter 3 is stopped by a gate blocking operation to prevent energy from the DC system, there arises a risk of generating an excessive voltage on the ~C bus line as well as a risk of self excitation phenomenon of the synchronous condenser 15 to accordingly generate an excessive voltage on the AC bus line 1 because the converter 3 does not consume a reactive power.
-3- 20-~65-558 Furthermore, even i~ the converter 3 is driven into a bypass pair operation, the converter 3 does not consume a reactive power as in the case of a ga-te blocking operation.
Thus, the synchronous condenser 15 is subjected to a self excitation phenomenon to make the AC bus line have an excessive voltage. Since non-conductive valves of the converter 3 under the bypass pair operation are applied with line voltages, exces-sive voltages are applied to the non-conductive valves, resulting in a possibility of breakdown of the power conver~er system.
SUMMARY OF T~E INVENTIO~
.
In view of the above-described problems, an object of the present invention is to provide a method and a system for operating a power converter system without generating an excessive voltage.
To achieve the above object.of the present invention, in a power converter connected to an AC power system provided with a synchronous condenser, if the power converter works as inverter while the synchronous condenser operates and a circuit breaker connected to the AC power system is opened to make the converter station load capacitive, then the power con-verter is driven in a zero power factor operation to consume a reactive power so that no energy from a DC system is received by the AC power system and an excessive voltage on the AC bus is prevented. Further, if the power converter works as rectifier, the operation may continue as it is to consume a reactive power and prevent an excessive voltage.
~ j7 -3a- 20375-55g rrhus~ in accordance with a broad aspect of the invention there is provided a method for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line provided with a snychronous condenser and connected to an AC power system through a breaker, comprising the steps of:
detecting whether or not said breaker is opened;
detecting whether or not said synchronous condenser is under operation;
detecting whether or not said power converter works as inverter; and driving said power converter at a firing angle cancelling a capacitive reactive power of said AC bus line when said breaker is opened, said synchronous condenser is under operation, and said power converter works as inverter.
In accordance with another broad aspect of the invention, there is provided a system for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line provided with a synchronous condenser 0 and connected to an AC power system through a breaker comprising:
first means for generating a second signal while said breaker is opened;
second means for generating a second signal while said synchronous condenser is under operation;
third means for generating a third signal ~hile said power converter works as inverter; and ., .
j 7 -3b- 20375-558 control means for driving said power converter a-t a predetermined firing angle upon reception of said first, second and third signals thereby cons~ming on said AC bus line a reactive po~er sufficient for cancelling a capaci-tive reactive power of said AC bus line.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The embodiment of the present invention will now be described with reference to Figure 1 wherein similar ,~ .
, .~ ~...
~ 7 elements to those in Fig. 2 are designated by the same reference numerals and the description therefor is omitted~ Reference numerals 18 to 21 represent AND
gates, reference numeral 22 represents an inverter, 23 a S firing angle setting device, 24 a switch, d a synchronous condenser status signal, and c a status signal of the circuit breaker 17. Signal INV indicates that the converter 3 operates as inverter, and signal f is a zero power factor operation command.
During an ordinary operation the breaker 17 is closed. Therefore, the signal c is "0" and hence the signal _ is "0" so that the converter 3 operates without incorporating a zero power fackor operation. Assume that the breaker 17 is opened during operation of the synchornous condenser 15. In this case, the signal d is "1" under operation of the synchronous condenser 15.
When the breaker 17 is opened, the signal c also becomes "1" to make the output signal e of the AND gate 18 "1".
In addition~ when the converter 3 works as inverter, the signal INV beomes "1". As a result, the output f of the AND gate 19 becomes "1" to close the switch 24 and input a firing angle set by the firing angle setting device 23 to the minimum value selection circuit 10. The firing angle is set at about 90 degrees. Since the output Z5 angles of the automatic current regulator 8 and the constant maryin angle circuit 9 are larger than 90 degre~s, the minimum value selection circuit 10 selects an input from the firing angle setting device ~3 and outputs it. As a result, the firing angle of the converter 3 becomes about 90 degrees to start a zero power factor operation consuming a substantial reactive power. Since the converter 3 is driven into a zero power factor operation and current continues to flow in the DC
system, there is no possibility of an excessive voltage.
In addition, since no energy is fed from the DC system to the AC system, an excessive voltage on the AC bus line, which might be caused by energy from the DC power system, 5 ~
does not occur. Further, since the converter 3 consumes a reactive power during its operation, the synchronous condenser 15 is not subject to the self excitation phenomenon and the AC bus line 1 does not generate an excessive voltage. The DC current under a zero power factor operation is needed to be set such that the converter 3 consumes a reactive power corresponding to the capacitive reactive power on the AC bus line including AC filters 14. If the DC current is set too small, an excessive voltage on the AC bus line 1 may occur. On the other hand, if the DC current is set too large, the voltage at the AC bus line is lowered, resulting in a possibility of commutation failure of the converter 3.
If the converter 3 works as rectifier, energy is not fed from the DC system to the AC system so that the rectifier operation may be continued. In this case, since the signal INV becomes "0", the zero power factor operation command f also becomes "0" so that the zero power factor operation does not occur and the reactive power is consumed and an excessive voltage is suppressed under the continued rectifier operation. Similar to the case of the zero power factor inverter operation, it i5 necessary to ~et the DC current so as to correspond to the capacitive reactive power on the AC bus.
Signal a represents a bypass pair command for the converter 3, and signal b represents a gate blocking signal for the converter 3. The signal f passing through the inverter 22 and the bypass pair command a are inputted to the AND gate 20 so as to block the bypass pair command a when the breaker 17 is opened during operation of the synchronous condenser 15. Thus, the converter 3 does not driven into a bypass pair operation.
Similarly, the signal r passing through the inverter 22 and the gate blocking signal b are inputted to the AND
gate 21 so as to block the gate blocking signal b when the breaker 17 is opened while the synchronous condenser 15 operates. Thus, the converter 3 is not subjected to gate blocking. The AND gates 20 and 21 are provided for the purpose of continuing the consumption of the reactive power by the converter.
If the synchronous condenser 15 is not under operation, the signal f remains "0" even i the breaker is opened, resulting in a "1" output of the inverter 22.
Therefore, the bypass pair command a or the gate blocking signal b from the protection unit 13 is not blocked by the AND gate 20 or 21. Consequently, if the sign~l a or b is "1", then the signal q or h becomes "1" to start the bypass pair operation or the gate blocking opexation by the phase control circuit 12.
AS seen from the foregoing description of the invention, it is possible to provide a method for operating the power converte~ system in which, even if the circuit breaker to the AC system is opened while the synchronous condenser operates, an excessive voltage by the self excitation of the synchronous condenser or an excessive voltage by energy fed from the AC power system, does not occur.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line provided with a synchronous condenser and connected to an AC
power system through a breaker, comprising the steps of:
detecting whether or not said breaker is opened;
detecting whether or not said synchronous condenser is under operation;
detecting whether or not said power converter works as inverter; and driving said power converter at a firing angle cancelling a capacitive reactive power of said AC bus line when said breaker is opened, said synchronous condenser is under operation and said power converter works as inverter.
power system through a breaker, comprising the steps of:
detecting whether or not said breaker is opened;
detecting whether or not said synchronous condenser is under operation;
detecting whether or not said power converter works as inverter; and driving said power converter at a firing angle cancelling a capacitive reactive power of said AC bus line when said breaker is opened, said synchronous condenser is under operation and said power converter works as inverter.
2. A method for operating a power converter according to claim 1, wherein said firing angle is about 90 degrees.
3. A system for operating a power converter connected between a DC bus line and an AC bus line, said AC bus line pro-vided with a synchronous condenser and connected to an AC power system through a breaker, comprising:
first means for generating a second signal while said breaker is opened;
second means for generating a second signal while said synchronous condenser is under operation;
third means for generating a third signal while said power converter works as inverter; and control means for driving said power converter at a predetermined firing angle upon reception of said first, second and third signals thereby consuming on said AC bus line a reactive power sufficient for cancelling a capacitive reactive power of said AC bus line.
first means for generating a second signal while said breaker is opened;
second means for generating a second signal while said synchronous condenser is under operation;
third means for generating a third signal while said power converter works as inverter; and control means for driving said power converter at a predetermined firing angle upon reception of said first, second and third signals thereby consuming on said AC bus line a reactive power sufficient for cancelling a capacitive reactive power of said AC bus line.
4. A system for operating a power converter according to claim 3, wherein:
said control means comprises firing angle setting means for outputting a fourth signal corresponding to said predetermined firing angle; and said control means drives said power converter at said predetermined firing angle based on said fourth signal.
said control means comprises firing angle setting means for outputting a fourth signal corresponding to said predetermined firing angle; and said control means drives said power converter at said predetermined firing angle based on said fourth signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60124283A JPS61285027A (en) | 1985-06-10 | 1985-06-10 | Operation of ac-dc converter |
| JP124283/1985 | 1985-06-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1262257A true CA1262257A (en) | 1989-10-10 |
Family
ID=14881502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000511104A Expired CA1262257A (en) | 1985-06-10 | 1986-06-09 | Method and system for operating power converter system |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4680691A (en) |
| EP (1) | EP0205100B1 (en) |
| JP (1) | JPS61285027A (en) |
| CA (1) | CA1262257A (en) |
| DE (1) | DE3680246D1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170334A (en) * | 1990-10-12 | 1992-12-08 | Kabushiki Kaisha Toshiba | Bypass-pair control apparatus for thyristor bridge |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2507387B2 (en) * | 1987-02-13 | 1996-06-12 | 株式会社東芝 | Power converter |
| US6169334B1 (en) | 1998-10-27 | 2001-01-02 | Capstone Turbine Corporation | Command and control system and method for multiple turbogenerators |
| US6093975A (en) * | 1998-10-27 | 2000-07-25 | Capstone Turbine Corporation | Turbogenerator/motor control with synchronous condenser |
| DE10156694B4 (en) * | 2001-11-17 | 2005-10-13 | Semikron Elektronik Gmbh & Co. Kg | circuitry |
| KR101480533B1 (en) * | 2013-06-28 | 2015-01-08 | 한국전력공사 | Apparatus and method for interconnecting distributed generations into power grid |
| CN111835020B (en) * | 2020-08-10 | 2021-04-20 | 中国南方电网有限责任公司超高压输电公司柳州局 | Converter station reactive power optimization method considering main transformer low-voltage side reactive power compensation device |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1943646C3 (en) * | 1969-08-28 | 1978-04-13 | Brown, Boveri & Cie Ag, 6800 Mannheim | Control arrangement for avoiding the line-frequency excess voltage that occurs in the event of a load shedding of a high-voltage direct current transmission system |
| JPS4937126A (en) * | 1972-08-12 | 1974-04-06 | ||
| SU752607A1 (en) * | 1978-04-03 | 1980-07-30 | Московское Отделение Научно-Исследовательского Института Постоянного Тока | Method of starting direct-current electric drive |
| JPS58148625A (en) * | 1982-02-26 | 1983-09-03 | 株式会社東芝 | Controller for converter |
| ZA837849B (en) * | 1982-11-03 | 1984-06-27 | Bbc Brown Boveri & Cie | Static power converter |
| JPS605781A (en) * | 1983-06-21 | 1985-01-12 | Toshiba Corp | Converter control system |
| JPS60235219A (en) * | 1984-05-08 | 1985-11-21 | Toshiba Corp | Control method of phase modifying equipment |
| JPS61157232A (en) * | 1984-12-28 | 1986-07-16 | 株式会社東芝 | Transient-time control method of alternating current and direct current converter |
-
1985
- 1985-06-10 JP JP60124283A patent/JPS61285027A/en active Pending
-
1986
- 1986-06-05 EP EP86107634A patent/EP0205100B1/en not_active Expired
- 1986-06-05 DE DE8686107634T patent/DE3680246D1/en not_active Expired - Lifetime
- 1986-06-06 US US06/871,365 patent/US4680691A/en not_active Expired - Fee Related
- 1986-06-09 CA CA000511104A patent/CA1262257A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5170334A (en) * | 1990-10-12 | 1992-12-08 | Kabushiki Kaisha Toshiba | Bypass-pair control apparatus for thyristor bridge |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3680246D1 (en) | 1991-08-22 |
| EP0205100B1 (en) | 1991-07-17 |
| JPS61285027A (en) | 1986-12-15 |
| EP0205100A3 (en) | 1987-09-02 |
| EP0205100A2 (en) | 1986-12-17 |
| US4680691A (en) | 1987-07-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3593078A (en) | Starting and operating control for an ac motor powered by a dc power supply | |
| US4695932A (en) | Superconductive energy storage circuit | |
| CA1127236A (en) | Control method and system for a high voltage direct current system | |
| CA1262257A (en) | Method and system for operating power converter system | |
| US4680692A (en) | Control apparatus of AC/DC power converter | |
| GB1280411A (en) | Improvements in or relating to high voltage direct current transmission systems | |
| US4107771A (en) | Circuit for shutting down an inverter | |
| US4394614A (en) | Static VAR generators | |
| RU2037249C1 (en) | System of uninterrupted power supply | |
| JPH0715875A (en) | Controller for reactive power compensator | |
| JP2909820B2 (en) | Load starting method using AC uninterruptible power supply | |
| JPS6154822A (en) | Method of controlling switching of bus in power plant | |
| JPS63195595A (en) | Nuclear power plant | |
| KR920001795Y1 (en) | Power converting apparatus | |
| JPH05207650A (en) | Controller for dc transmission system | |
| JP2001095156A (en) | Power distribution system | |
| JPH0421433B2 (en) | ||
| JPH10145976A (en) | Control of phase advance capacitor installation | |
| JPH0221217B2 (en) | ||
| JPS60241715A (en) | Operation system of dc transmitter | |
| JPH04308428A (en) | Method for preventing reverse charging of system interconnection power transformer | |
| JPS6285649A (en) | Electric source apparatus | |
| JPH10145975A (en) | Control of phase advance capacitor installation | |
| JPH0556564A (en) | Distributed power system | |
| JPH0130370B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |