CN102222932A - Isolated island detecting device and method based on load characteristic - Google Patents
Isolated island detecting device and method based on load characteristic Download PDFInfo
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- CN102222932A CN102222932A CN2011101517401A CN201110151740A CN102222932A CN 102222932 A CN102222932 A CN 102222932A CN 2011101517401 A CN2011101517401 A CN 2011101517401A CN 201110151740 A CN201110151740 A CN 201110151740A CN 102222932 A CN102222932 A CN 102222932A
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- 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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses an isolated island detecting device and a method based on load characteristic. The concept of load characteristic is applied to new energy resource isolated island detection so that the isolated island can be well detected and the isolated island detecting time can be reduced. The isolated island detecting device based on load characteristic comprises the following structures or units: a grid-connected bus side current and voltage collecting unit, a current and voltage regulation circuit, an algorithm control unit, a driving circuit and an inverting unit, wherein the grid-connected bus side current and voltage collecting unit collects the data of the grid-connected bus side current and voltage; the current and voltage regulation circuit can filtrate and amplify the voltage and current signal obtained by sampling; the algorithm control unit analyzes the sampled data, controls the conduction of the inverting system and the power network according to the power network state, and controls PWM (pulse width modulation) signal output by the algorithm; the driving circuit reinforces the driving capability of the PWM control signal; and the inverting unit can reversely converts the direct-current signal into the alternating-current signal by the PWM control signal.
Description
Technical field
The present invention relates to a kind of checkout gear and method, relate in particular to a kind of island detection device and method based on load characteristic.
Background technology
Power supply when Utilities Electric Co., barrier accident or when having a power failure maintenance and escape for some reason, the solar grid-connected electricity generation system of each user side is failed in time to detect power down mode and will self be cut off electricity network, and the self-energizing isolated island that the Utilities Electric Co. that formation is formed by solar grid-connected electricity generation system and local on every side load can't grasp, grid-connected system and local load form the independent operating state, and this state is exactly the island effect of solar grid-connected generating.Island effect does not only occur in the solar grid-connected electricity generation system, in fact, so long as distributed grid-connected system all might produce the island effect problem.
Isolated island produces reason can be summed up as the following aspects:
(1) the grid generation system is out of service greatly causes whole grid power blackout, but photovoltaic parallel in system still is connected on the big electrical network by throwing the lock switch, and its output capacity might be kept to mains supply and surpass section sometime;
(2) big electrical network or power distribution network somewhere circuit disconnect or switch trip, cause photovoltaic parallel in system to form autonomous power supply system with connection load (may comprise the fractional load on the power distribution network), and may enter steady operational status;
(3) photovoltaic parallel in system is thrown the autonomous or unexpected disconnection of lock switch, but grid-connected system and local network form islet operation.
Utilities Electric Co. just loses the control to line voltage distribution, frequency under island state, and then can bring a series of potential safety hazard and accident dispute:
(1) influences the operation program of protection switch on the distribution system;
(2) electrical network can not be controlled the voltage and the frequency in electric power isolated island zone, may cause because of supply power voltage and frequency shakiness to make user's power consumption equipment damage;
(3) harm transmission line maintenance personal's safety;
(4) influencing electrical network manually or automatically resumes operation.
Therefore, Utilities Electric Co.'s distributed generation system of requiring to be incorporated into the power networks can in time must in time detect isolated island and the line between distributed power generation device and public electric wire net is disconnected.Be definition like this in the photovoltaic system that U.S. electric and Electronic Engineering Association work out is incorporated into the power networks international standard IEEE Std.929-2000 and " no isolated island inverter (the non-islanding inverter) " of electrical network interface:
(1) the mismatch degree of PV inverter active power of output and load consumption power is greater than 50%; Or: the local power-factor of load must stop to mains supply in 10 cycles after the electrical network decompression less than 95% o'clock.
(2) active power mismatch degree 50% with the interior and local power-factor of load greater than 95% o'clock, inverter should be able to stop mains supply in the 2s after the electrical network decompression.
The load object of These parameters indication is the parallel resonance load of quality factor q f≤2.5.
The U.S., Germany, Japan etc. to solar power generation research country early from just setting about beginning to work out the concerned countries standard at the end of last century, and to its constantly revise, perfect, with the development of standard, the domestic photovoltaic generation industry of guiding.The photovoltaic system of working out as the U.S. U.S. rule of the standard IEEE1547/IEEE1547.1 standard that is incorporated into the power networks; The photovoltaic system that Germany the works out standard TUV (authentication with newest standards DIN VDE 0126-1-1) that is incorporated into the power networks; The photovoltaic system that Australia the works out standard Australia rule AS4777 standard that is incorporated into the power networks; The photovoltaic system that Spain works out standard RD 1663/2000 authentication of being incorporated into the power networks; Other country as Canada, Britain, Holland etc. have also formulated oneself national standard following closely, authenticate as the photovoltaic system of the Britain's formulation standard G83/1 that is incorporated into the power networks; The photovoltaic system that Italy the works out standard DK5940 authentication of being incorporated into the power networks.In the requirement and technical indicator of island detection, country variant greatly differs from each other, and only requires to carry out the detection of transfiniting of passive type voltage, frequency as Holland, and Germany has but planned active detection method and test request thereof meticulously; The country that has thinks that the photovoltaic system isolated island is little to the influence of the automatic reclosing of relay, therefore grow (reaching 5 seconds) detection time that allows in standard, and the national requirements that has is shorter, as the regulation island detection time in the Unite States Standard be 2 seconds; From grid power return to shortest time that inverter is incorporated into the power networks again at interval the regulation of aspect also differ greatly, the North America requires to lag behind at least 5 minutes, Germany only required to lag behind 20 seconds.
China issues the concerned countries standard in November, 2005, i.e. the photovoltaic system specification requirement of being incorporated into the power networks, and this standard is respectively from January 1st, 2006 and 2006 enforcement on February 1.In the standard island detection requirement is comprised:
(1) during the electrical network decompression, the isolated island effect prevention protection must be moved in 2s, with photovoltaic system and electrical network disconnection;
(2) each is a kind of should to adopt active and passive island detection method at least.
Mention in the choosing of CNCA/CTS 0004-2009 " special inverter specification requirement of the following low-pressure grid-connection photovoltaic generation of 400V and test method " the isolated island effect prevention protection scheme of in August, 2009 promulgation: be divided into active anti-isolated island protection scheme and passive type is prevented the isolated island protection scheme based on the isolated island effect prevention protection scheme of combining inverter.The passive type scheme detects island effect unusually by what detect inverter ac output end voltage or frequency.Because the detection range of passive type scheme is limited, therefore, must adopt active scheme in order to satisfy the requirement of the anti-isolated island protection of combining inverter safety standard.Active scheme is come the respective change of voltage in the supervisory control system, frequency and impedance by introducing disturbing signal wittingly, to determine whether existing of electrical network.Active isolated island effect prevention protection scheme mainly contains frequency shift (FS), current impulse and injects the impedance change that causes, electric line carrier communication etc.Passive type isolated island effect prevention protection scheme mainly contains voltage-phase saltus step, 3 voltage harmonic changes, frequency change rate detection, active power change, reactive power change etc.
Also clearly mention the scheme of choosing of isolated island effect prevention protection scheme among Beijing mirror weighing apparatus authentication techniques standard " specification requirement of grid-connected photovoltaic power generation special inverter and test method " CGC/GF001:2010 of authentication center (CNCA/CTS00X:2010):
Isolated island effect prevention protection scheme based on combining inverter is divided into active anti-isolated island protection scheme and the anti-isolated island protection scheme of passive type.The passive type scheme detects island effect unusually by what detect inverter ac output end voltage or frequency.Because the detection range of passive type scheme is limited, therefore,, the protection of each a kind of active and passive isolated island effect prevention should be set at least according to GB19939-2005 6.3 joint regulations in order to satisfy the requirement of the anti-isolated island protection of combining inverter safety standard.Active scheme is come the respective change of voltage in the supervisory control system, frequency and impedance by introducing disturbing signal wittingly, to determine whether existing of electrical network.
Active isolated island effect prevention protection scheme mainly contains frequency shift (FS), current impulse and injects the impedance change that causes, electric line carrier communication etc.
Passive type isolated island effect prevention protection scheme mainly contains voltage-phase saltus step, 3 voltage harmonic changes, frequency change rate detection, active power change, reactive power change etc.
Choosing of isolated island effect prevention protection scheme should be considered following rule:
A) to take into account and consider to detect performance, the output quality of power supply and the influence of whole system transient response;
B) if a simple and harm that the low isolated island effect prevention protection scheme of cost brings island effect is reduced to below other the electric power harm, so this scheme be suitable.
Conventional initiatively island detection method all is to inject a disturbance quantity in electrical network, judges island state by the variation of disturbance quantity.Initiatively frequency-shift type and active phase shift island detection method produce disturbance to frequency and phase place, and this disturbance exists when grid-connected work all the time, must influence the quality of photovoltaic system output current, makes the output current aberration rate improve.The photovoltaic system interconnection technology requires to require current distortion rate control in (GB/T 19939-2005) within limits, be that total harmonic current should be less than 5% of the specified output of inverter, wherein the aberration rate of odd harmonic is less than 4.0%, and the aberration rate of even-order harmonic is less than 2.0%.
The inverter output quality of power supply need satisfy the clause standard in the following files simultaneously:
GB/T 12325 quality of power supply admissible deviation of supply volt-ages
GB/T 14549 quality of power supply utility network harmonic waves
GB/T 15543 quality of power supply three-phase voltages allow degree of unbalance
GB/T 15945 quality of power supply power system frequency permissible variations
The immunity experiment of GB/T 17626.11-2008 EMC test and measuring technique voltage dip, interruption in short-term and change in voltage (IEC 61000-4-11:2004, IDT)
GB/T 17626.5-2008 EMC test and measuring technique surge (impact) immunity experiment (IEC61000-4-5:2005, IDT)
Same inverter current control strategy, PWM modulation strategy, switching frequency, mains frequency fluctuation etc. all can produce certain current distortion, the distortion of having only the island detection algorithm to introduce should be much smaller than the specification requirement of being incorporated into the power networks, and these detection methods just may be widely accepted.
Therefore, need a kind of new island detection device and method of exploitation to solve the problem that prior art exists.
Summary of the invention
The objective of the invention is to solve above-mentioned the deficiencies in the prior art and problem, a kind of island detection device based on load characteristic is provided, it is applied to the notion of load characteristic in the new forms of energy island detection, can well detect isolated island, and reduce the island detection time.
The present invention also provides this island detection Device Testing method based on load characteristic.
Technical scheme of the present invention is as follows:
Island detection device based on load characteristic of the present invention, it comprises following structure or unit: the bus bar side that is incorporated into the power networks electric current and voltage acquisition unit: the data of gathering be incorporated into the power networks bus bar side electric current and voltage; Electric current and voltage modulate circuit: voltage and current signal filtering, amplification that sampling is obtained; The algorithm controls unit: the analytical sampling data, according to the break-make of electric network state control inversion system and electrical network, and by the output of algorithm controls pwm signal; Drive circuit: the driving force that strengthens pwm control signal; Inversion unit: is AC signal by pwm control signal with the direct current signal inversion.
Island detection device based on load characteristic of the present invention, its further technical scheme is that described bus bar side electric current and the voltage acquisition unit of being incorporated into the power networks is made up of voltage sensor and Hall current sensor, voltage sensor and Hall current sensor directly are connected inverter output bus bar side, and are connected with the current regulating circuit; Connect by drive circuit between described algorithm controls unit, the inversion unit.
Island detection device based on load characteristic of the present invention, the control circuit that its further technical scheme is described inversion unit is made up of digital signal processor TMS320F2812.
Island detection Device Testing method based on load characteristic of the present invention, it may further comprise the steps:
A) beginning, the bus bar side that is incorporated into the power networks electric current and voltage acquisition unit acquired signal, checkout gear detects phase place and the frequency between load-side and the grid side;
B) judge the characteristic of load by detected voltage, electric current; If voltage not at zero crossing, then returns the phase place and the frequency of resampling voltage, electric current, if voltage at zero crossing, judges then whether electric current is in zero crossing;
C) if electric current is in zero crossing, judge that then load is a resistive load, if electric current is a capacitive load greater than zero, otherwise load is a perception;
D) after load characteristic is judged, judge according to the side-play amount of frequency whether the isolated island fault takes place; If the positive side-play amount of frequency negative bias of frequency when setting amplitude or resistance, capacitive load moves greater than set point during inductive load, can determine that then the isolated island fault takes place, otherwise return the phase place and the frequency of resampling voltage, electric current, thereby realize the isolated island protection.
Island detection Device Testing method based on load characteristic of the present invention, its further technical scheme is the digital signal processor TMS320F2812 that described be incorporated into the power networks bus bar side electric current and voltage acquisition unit acquired signal are input to the control circuit of inversion unit, detect by load characteristic, frequency shift (FS), the frequency positive feedback produces reference current, control PWM output.
Island detection Device Testing method based on load characteristic of the present invention, its further technical scheme can also be that described TMS320F2812 output control signal is amplified by drive circuit.
In the island detection device and method based on load characteristic of the present invention, the inverter circuit control signal realizes the isolated island protection by the output that combines of island detection algorithm among the DSP and inversion algorithm.
Basic principle of the present invention is: by in real time line voltage, current phase being detected, judge network load characteristic, the different loads characteristic is selected different offset directions, to compare with given frequency to the signal bias amount, produce new given reference signal and give inverter, as control signal, to realize island detection.In the method, also added amount of positive feedback, the further like this detection speed that improved.
Among the present invention, control unit is made up of digital signal processor TMS320F2812, and it is according to the voltage that is sent by collecting unit, current regulating circuit, the detection that current signal is realized isolated island.With TMS320F2812 is the control core unit, and the basic thought of its realization is: by given mains frequency signal is carried out different skews, satisfying under the quality of power supply requirement fast detecting isolated island.Implementation procedure is as follows particularly:
(1) grid side electric voltage frequency frequency, phase place theta_U, the current phase theta_I that sampling is obtained carries out phase deviation and judges, determines the load characteristic at present electrical network Coupling point place, suc as formula (1):
Δtheta＝theta_U-theta_I ①
If current phase leading voltage phase place, promptly the 1. middle Δ theta of formula＞0 illustrates that then this load is a capacitive load; If current phase lagging voltage phase place, promptly the 1. middle Δ theta of formula＜0 illustrates that then this load is an inductive load; Otherwise be resistive load.
(2) adopting different frequency shift (FS) directions for different loads, is capacitive if detect Coupling point, adopts the frequency negative bias to move; Be perception if detect Coupling point, adopt frequency just to be offset.
Formula 2. in, when load is that perception is just put K=1, increase frequency; When just putting K=-1, reduce frequency for capacitive; Otherwise just put K=0, keep original frequency change.
(3) in order to improve system's island detection time, the present invention has adopted Feedback Design, and offset deviation is fed back to system, as the superposition value of input next time.
f
k+1＝f
k+k*(f
k·f
k-1) ③
Formula 3. in, combine with load characteristic by frequency departure and to realize frequency shift (FS).
(4) size of judgement mains frequency frequency
f
under≤f≤f
over ④
Formula 4. in, f is an actual frequency, f
UnderBe lower-frequency limit, f
OverBe upper frequency limit.
If 4. formula is set up, illustrate that system frequency judges that applying disturbing signal carries out frequency shift (FS) to system so proceed load characteristic in quality of power supply range of operation at this moment.
(5) obtained the sinusoidal current waveform in reference tape dead band according to frequency offset.At this moment, will multiply by current amplitude as the reference electric current, produce the signal controlling inverter by comparing with actual current with waveform.
The present invention has following beneficial effect:
The island detection method and the device that the present invention is based on load characteristic are applied to load characteristic in the island detection, and the detection of grid characteristic realizes different skews more quickly and accurately, has reduced the island detection blind area; Owing to only need detect, not need to increase the additional hardware cost to power network current, voltage; The island detection time is further shortened in the adding of positive feedback.
Description of drawings
Fig. 1 is the island detection device hardware platform structural representation that the present invention is based on load characteristic, among Fig. 1: 1-photovoltaic battery panel, 2-direct current sample circuit, 3-maximal power tracing (MPPT), 4-SPWM output control circuit, 5-DC-DC converter, 6-DC-AC inverter, 7-inverter control circuit, 8-filter circuit, 9-AC network, 10-load characteristic island detection.
Fig. 2 is based on load characteristic island detection method schematic flow sheet.
Embodiment
Below in conjunction with accompanying drawing the technology of the present invention content is explained:
As shown in Figure 1 and Figure 2, the present invention is based on load characteristic the island detection device it comprise following structure or unit: the bus bar side that is incorporated into the power networks electric current and voltage acquisition unit: the data of gathering be incorporated into the power networks bus bar side electric current and voltage; Electric current and voltage modulate circuit: voltage and current signal filtering, amplification that sampling is obtained; The algorithm controls unit: the analytical sampling data, according to the break-make of electric network state control inversion system and electrical network, and by the output of algorithm controls pwm signal; Drive circuit: the driving force that strengthens pwm control signal; Inversion unit: is AC signal by pwm control signal with the direct current signal inversion; Described bus bar side electric current and the voltage acquisition unit of being incorporated into the power networks is made up of voltage sensor and Hall current sensor, and voltage sensor and Hall current sensor directly are connected inverter output bus bar side, and is connected with the current regulating circuit; Connect by drive circuit between described algorithm controls unit, the inversion unit; The control circuit of described inversion unit is made up of digital signal processor TMS320F2812, and drive circuit is made up of three groups of IR2101 circuit, is connected by IR2101 between inverter control end and the TMS320F2812.
The island detection Device Testing method based on load characteristic of this enforcement, it may further comprise the steps:
A) beginning, the bus bar side that is incorporated into the power networks electric current and voltage acquisition unit acquired signal, checkout gear detects phase place and the frequency between load-side and the grid side;
B) judge the characteristic of load by detected voltage, electric current; If voltage not at zero crossing, then returns the phase place and the frequency of resampling voltage, electric current, if voltage at zero crossing, judges then whether electric current is in zero crossing;
C) if electric current is in zero crossing, judge that then load is a resistive load, if electric current is a capacitive load greater than zero, otherwise load is a perception;
D) after load characteristic is judged, judge according to the side-play amount of frequency whether the isolated island fault takes place; If the positive side-play amount of frequency negative bias of frequency when setting amplitude or resistance, capacitive load moves greater than set point during inductive load, can determine that then the isolated island fault takes place, otherwise return the phase place and the frequency of resampling voltage, electric current, thereby realize the isolated island protection;
Wherein said be incorporated into the power networks bus bar side electric current and voltage acquisition unit acquired signal are input to the digital signal processor TMS320F2812 of the control circuit of inversion unit, detect by load characteristic, frequency shift (FS), the frequency positive feedback produces reference current, control PWM output; Described TMS320F2812 output control signal is amplified by drive circuit.
In this enforcement, the three-phase line voltage of electric network source is 380V, and the triple line electric current can reach 80A, and sampling unit working voltage instrument transformer detects the three-phase voltage of grid side, uses Hall current sensor to detect the electric current of grid side.Because what control unit used is the TMS320F2812 chip, the A/D converter that carries on its sheet is unipolar, can only receive the voltage signal of 0～3.3V.Yet current detection signal is ambipolar, so the current signal by Hall current sensor output must convert voltage signal to through sampling resistor, and then through a dc bias circuit within the scope of voltage transformation to 0～3.3V, could be connected with the TMS320F2812 of control unit like this.The current signal of current sensor output converts voltage signal to through the sampling resistor of 0.03 Ω, send into the anti-aliasing filter circuit of back level after the voltage that the voltage of process voltage follower output and dc offset voltage circuit produce is superimposed, so just exported the voltage signal of 0～3.3V, thereby realized being connected of sampling unit and control unit.
In this enforcement,, need pass through phase-locked loop, detect mains frequency voltage, the current signal that collects for control unit TMS320F2812.Realize that by the zero passage capturing function voltage, current phase detect, and realize the detection of load characteristic.In TMS320F2812, the different loads characteristic is adopted different offset manner, in skew, add positive feedback.Produce reference current signal by different offset manner,,, thereby realize island detection by the drive circuit control inverter with actual current and reference current comparative parameter inverter control signal.
Claims (6)
1. the island detection device based on load characteristic is characterized in that comprising following structure or unit: the bus bar side that is incorporated into the power networks electric current and voltage acquisition unit: the data of gathering be incorporated into the power networks bus bar side electric current and voltage; Electric current and voltage modulate circuit: voltage and current signal filtering, amplification that sampling is obtained; The algorithm controls unit: the analytical sampling data, according to the break-make of electric network state control inversion system and electrical network, and by the output of algorithm controls pwm signal; Drive circuit: the driving force that strengthens pwm control signal; Inversion unit: is AC signal by pwm control signal with the direct current signal inversion.
2. the island detection device based on load characteristic according to claim 1, it is characterized in that described bus bar side electric current and the voltage acquisition unit of being incorporated into the power networks be made up of voltage sensor and Hall current sensor, voltage sensor and Hall current sensor directly are connected inverter output bus bar side, and are connected with the current regulating circuit; Connect by drive circuit between described algorithm controls unit, the inversion unit.
3. the island detection device based on load characteristic according to claim 1 is characterized in that the control circuit of described inversion unit is made up of digital signal processor TMS320F2812.
4. the island detection Device Testing method based on load characteristic according to claim 1 is characterized in that may further comprise the steps:
A) beginning, the bus bar side that is incorporated into the power networks electric current and voltage acquisition unit acquired signal, checkout gear detects phase place and the frequency between load-side and the grid side;
B) judge the characteristic of load by detected voltage, electric current; If voltage not at zero crossing, then returns the phase place and the frequency of resampling voltage, electric current, if voltage at zero crossing, judges then whether electric current is in zero crossing;
C) if electric current is in zero crossing, judge that then load is a resistive load, if electric current is a capacitive load greater than zero, otherwise load is a perception;
D) after load characteristic is judged, judge according to the side-play amount of frequency whether the isolated island fault takes place; If the positive side-play amount of frequency negative bias of frequency when setting amplitude or resistance, capacitive load moves greater than set point during inductive load, can determine that then the isolated island fault takes place, otherwise return the phase place and the frequency of resampling voltage, electric current, thereby realize the isolated island protection.
5. the island detection Device Testing method based on load characteristic according to claim 4, it is characterized in that described be incorporated into the power networks bus bar side electric current and voltage acquisition unit acquired signal are input to the digital signal processor TMS320F2812 of the control circuit of inversion unit, detect by load characteristic, frequency shift (FS), the frequency positive feedback produces reference current, control PWM output.
6. the island detection Device Testing method based on load characteristic according to claim 5 is characterized in that described TMS320F2812 exports control signal and amplified by drive circuit.
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| CN102611183A (en) * | 2012-03-01 | 2012-07-25 | 珠海天兆新能源技术有限公司 | Method for detecting and protecting isolated island of grid-connected power generation system |
| CN103116103A (en) * | 2013-02-04 | 2013-05-22 | 江苏大全凯帆电器股份有限公司 | Method for actively detecting frequency drift islands |
| CN103645404A (en) * | 2013-12-16 | 2014-03-19 | 辽宁工业大学 | Micro-grid islanding detection method |
| CN104237712A (en) * | 2014-10-16 | 2014-12-24 | 华北电力大学 | Method and device for detecting island and island processing system |
| CN104682356A (en) * | 2015-02-10 | 2015-06-03 | 南京能迪电气技术有限公司 | Adaptive variable load anti-islanding method for distributed type photovoltaic power supply |
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| CN106019010A (en) * | 2016-05-23 | 2016-10-12 | 南昌大学 | Mixed island detection method based on combination of slide mode frequency shift method and passive method |
| US9520819B2 (en) | 2014-02-28 | 2016-12-13 | General Electric Company | System and method for controlling a power generation system based on a detected islanding event |
| CN108680822A (en) * | 2018-08-20 | 2018-10-19 | 金陵科技学院 | A kind of adaptive island detection method and capacitive load determination method therein |
| CN109390941A (en) * | 2018-12-21 | 2019-02-26 | 重庆樱花能源科技有限公司 | A kind of electric power distribution system for distributing-supplying-energy system |
| CN114069717A (en) * | 2022-01-18 | 2022-02-18 | 国网上海能源互联网研究院有限公司 | Method and device for anti-islanding control of transformer area integrated with distributed photovoltaic |
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