WO2002096696A1 - System and method for actively limiting the power drawn from a power distribution bus - Google Patents
System and method for actively limiting the power drawn from a power distribution bus Download PDFInfo
- Publication number
- WO2002096696A1 WO2002096696A1 PCT/US2002/010475 US0210475W WO02096696A1 WO 2002096696 A1 WO2002096696 A1 WO 2002096696A1 US 0210475 W US0210475 W US 0210475W WO 02096696 A1 WO02096696 A1 WO 02096696A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- command signal
- magnitude
- voltage
- current
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
- B60L15/2045—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for optimising the use of energy
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Definitions
- the present invention relates to a system and method for limiting power drawn by a load. More particularly, the invention relates to a system and method for actively limiting the electric power drawn from a power distribution bus by one or more electric motor loads.
- Electric motor loads are installed and utilized in various environments in which size, weight, and cost are limiting variables.
- modern aircraft both for commercial and military applications, are now being designed with electrically powered actuation systems.
- Such actuation systems increase the electric load on the aircraft's main electric power distribution system.
- the electric power demand of electric actuation systems is determined by actuator speed and the load on J e actuator. It is difficult, however, to design the power distribution system for the full range of load that the actuators may naturally encounter over the entire operating envelope of the aircraft.
- the power generation and distribution system must be designed with a sufficiently conservative design margin.
- a system and method for limiting the power that is drawn from a main power distribution bus by one or more electric motor loads that solves at least the above-described problems. Namely, a system and method for actively limiting the power drawn from the main power distribution bus by one or more electric motor loads so that the required design capacity of both the generation and distribution system, and the motor controllers, can be reduced, resulting in reduced size, weight, and cost.
- a control system for actively limiting the power drawn from a power distribution bus by one or more electrical loads to a predetermined maximum power level includes current based power limit determination means and power limiting means.
- the current based power limit determination means receives at least a signal representative of a voltage magnitude supplied to the one or more electrical loads, determines a maximum permissible current magnitude, based on the received signal, that may be supplied to the one or more electrical loads from the power distribution bus to prevent the electrical power drawn therefrom from exceeding the predetermined maximum power level, and generates a power limited current command signal based on the determined maximum permissible current magnitude.
- a control system for actively limiting electrical power drawn from a power distribution bus by one or more electrical loads to a predetermined maximum power level includes voltage based power limit determination means and power limiting means.
- the voltage based power limit determination means receives at least a signal representative of a current magnitude supplied to the one or more electrical loads, determines a maximum permissible voltage magnitude, based on the received signal, that may be supplied to the one or more electrical loads from the power distribution bus to prevent the electrical power drawn therefrom from exceeding the predetermined maximum power level, and generates a power limited voltage command signal based on the determined maximum permissible voltage magnitude.
- the power limiting means in response to the power limited voltage command signal, limits the power drawn from the power distribution bus to the maximum permissible power level.
- a control system for actively limiting electrical power drawn from a power distribution bus by one or more electrical loads to a predetermined maximum power level includes current based power limit determination means, voltage command determination means, voltage based power limit determination means, and power limiting means.
- the current based power limit determination means receives at least a signal representative of a voltage magnitude supplied to the one or more electrical loads, determines a maximum permissible current magnitude, based on the received signal, that may be supplied to the one or more electrical loads from the power distribution bus to prevent the electrical power drawn therefrom from exceeding the predetermined maximum power level, and generates a power limited current command signal based on the determined maximum permissible current magnitude.
- the voltage command determination means receives the power limited current command signal and a signal representative of a current magnitude supplied to the one or more electrical loads, determines a voltage magnitude to be supplied to the one or more electrical loads from the power distribution bus, and generates a voltage command signal.
- the voltage based power limit determination means receives at least the voltage command signal and a signal representative of a current magnitude supplied to the one or more electrical loads, determines a maximum permissible voltage magnitude, based on the received current magnitude signal, that may be supplied to the one or more electrical loads from the power distribution bus to prevent the electrical power drawn therefrom from exceeding the predetermined maximum power level, and generates a power limited voltage command signal based on the determined maximum permissible voltage magnitude.
- the power limiting means in response to the power limited voltage command signal, limits the power drawn from the power distribution bus to the maximum permissible power level.
- FIG. 1 is a functional block diagram of a controller circuit according to a preferred embodiment of the present
- FIG. 2 is a functional block diagram of a controller circuit according to an alternative embodiment of the present.
- FIG. 3 is a functional block diagram of a controller circuit according to yet another alternative embodiment of the present
- FIG. 4 is a flowchart depicting the method of actively limiting the power drawn by one or more electric loads according to the preferred embodiment of the present invention.
- FIG. 5 illustrates various graphs depicting an operation of a thrust reverser actuation system during a deploy operation that implements the present invention.
- the predetermined power level is the design power level of the main power distribution system into which the present invention is installed. It should be appreciated, however, that the present invention is not limited to the predetermined power level being the design power level. Indeed, the predetermined power level could be any power level drawn from a power distribution system, by one or more electrical loads, that is required or desired not to be exceeded. Additionally, it should be noted that for purposes of this disclosure, the term “motor load” includes both an electric motor 32 and any concomitant power conditioning circuitry 34 (see FIG. 1).
- the power conditioning circuitry 34 which may encompass various designs, such as an inverter or driver, controls the delivery of power from a main power distribution bus 20 to the electric motor 32.
- the controller circuit 10 is electrically coupled between a main power distribution bus 20 and a motor load 30.
- the controller circuit 10 comprises at least four functional circuits for actively limiting the power drawn from the main power distribution bus 20 by the motor load 30. These functional circuits include current command determination circuitry 12, current based power limit determination circuitry 14, voltage command determination circuitry 16, and voltage based power limit determination circuitry 18. It will be appreciated that the controller circuit 10 may include other functional circuitry as well; however, for clarity, only these four functional circuits are depicted and described. It will further be appreciated that four functional circuits is only exemplary of a preferred embodiment, and that these functional circuits could be combined.
- the current command determination circuitry 12 receives an input command signal 40 and provides a current command signal (ICOM) representative of the current magnitude that should be drawn by the motor load 30.
- ICOM current command signal
- the input command signal 40 is representative of the desired speed and rotational direction of the motor 32.
- the current command determination circuitry 12 receives a feedback signal 42 representative of the actual rotational speed of the motor 32.
- the current command signal (ICOM) is generated based on a comparison of the commanded rate signal 40 with the feedback signal 42.
- the current based power limit determination circuitry 14 receives the current command signal (ICOM) and a signal 44 representative of the voltage magnitude supplied from the main power distribution bus 20 to the motor load 30. The current based power limit determination circuitry 14 uses these signals to determine the current magnitude that should be supplied to the motor load 30. Specifically, the current based power limit determination circuitry 14 determines, based on the supplied voltage magnitude signal, the maximum permissible current magnitude that may be supplied to the motor load 30 from the main power distribution bus 20 to prevent the power drawn from the main power distribution bus 20 from greatly exceeding the predetermined power level. From this maximum permissible current magnitude determination, the current based power limit determination circuitry 14 generates a "maximum" current command signal (ICOM M AX).
- ICOM M AX maximum permissible current command signal
- This maximum current command signal (ICOMMAX) is compared to the current command signal (ICOM) received from the current command determination circuitry 12, and a "power limited" current command signal (ICOMu m it) is output on the basis of this comparison. For instance, if the current command signal (ICOM) exceeds the maximum current command signal
- the power limited command signal (ICOMumit) output from the current based power limit determination circuitry 14 is the lesser in magnitude of the maximum current command signal (ICOMM AX ) and the current command signal (ICOM).
- the maximum permissible current determination performed by the current based power limit determination circuitry 14 described above may be implemented using either analog or digital circuitry. If digital circuitry is utilized, then the determination may be made by a straightforward software driven calculation, by utilizing one or more look-up tables, by a combination thereof, or by other numerous methods known in the art.
- the signal representative of the voltage magnitude supplied to the motor load 30 is generated using one of numerous methods known in the art.
- the signal may be based on a voltage magnitude that is sensed directly.
- the signal may be based on a voltage magnitude that is estimated from various operational or design parameters of the motor load 30.
- the voltage magnitude may be estimated based on a sensed rotational speed of the motor load 30, from motor design parameters such as back EMF. If the motor load 30 is a multi-phase motor, then different phase voltages may be determined directly or estimated from operational or design parameters.
- the voltage command determination circuitry 16 receives the power limited current command signal (ICOM ⁇ mit) from the current based power limit determination circuitry 14 and a signal 46 representative of the current magnitude supplied from the main power distribution bus 20 to the motor load 30.
- the voltage command determination circuitry 16 uses these signals to generate a voltage command signal (VCOM).
- the voltage command signal (VCOM) is a signal representative of the voltage magnitude that should be supplied to the motor load 30, based on the received power limited current command signal (ICOMnmit).
- the voltage command signal (VCOM) is then transmitted to the voltage based power limit determination circuitry 18.
- the voltage based power limit determination circuitry 18 functions similar to the current based power limit determination circuitry 14, in that it determines the maximum permissible voltage magnitude, based on the supplied current magnitude signal, that may be supplied to the motor load 30 from the main power distribution bus 20 to prevent the power drawn from the main power distribution bus 20 from exceeding the predetermined power level. Specifically, the voltage based power limit determination circuitry 18 receives the voltage command signal (VCOM) and a signal 46 representative of the current magnitude supplied from the main power distribution bus 20 to the motor load 30. The voltage limit determination circuitry 18 then uses these signals to determine the maximum voltage magnitude that should be supplied to the motor load 30.
- VCOM voltage command signal
- the voltage based power limit determination circuitry 18 As with the current based power limit determination circuitry 14, from the determined maximum voltage magnitude, the voltage based power limit determination circuitry 18 generates a "maximum" voltage command signal (VCOMMAX).
- This maximum voltage command signal (VCOM MAX ) is compared to the voltage command signal (VCOM) received from the voltage command determination circuitry 16, and a "power limited” voltage command signal (VCOM ⁇ ; m i t ) is output on the basis of this comparison. Specifically, if the voltage command signal (VCOM) exceeds the maximum voltage command signal (VCOM MA X), then this indicates that the main power distribution bus 20 will be supplying power to the motor load 30 in excess of the predetermined power level.
- the power limited voltage current command signal (VCOMnmit) output from the voltage based power limit determination circuitry 18 is the lesser in magnitude of the maximum voltage command signal (VCOM M A X ) and the voltage command signal (VCOM).
- the signal representative of the current magnitude supplied to the motor load 30 is also generated using one of numerous methods known in the art.
- the signal may be based on a current magnitude that is sensed directly.
- the signal may be based on a current magnitude that is estimated from various operational or design parameters of the motor load 30.
- the maximum permissible voltage determination performed by the voltage based power limit determination circuitry 18 may be implemented using either analog or digital circuitry. If digital circuitry is utilized, then the determination may be made by a straightforward software driven calculation, by utilizing one or more look-up tables, by a combination thereof, or by other numerous methods known in the art.
- the motor load 30, as defined herein, includes not only the electric motor 32, but the power conditioning circuitry 34 as well.
- the power conditioning circuitry 34 receives a power signal (Pin) from the main power distribution bus 20 and the power limited voltage command signal (VCOMu m i t ) output by the voltage based power limit determination circuitry 18, as described above.
- the power conditioning circuitry 34 based on this signal, provides a properly conditioned signal to the electric motor 32 that ensures the power drawn from the main power distribution bus 20 does not exceed the predetermined power level.
- the specific signal conditioning performed by the power conditioning circuitry 34 will depend on the type of electric motor 32 (e.g., AC or DC) that is being used.
- the current based power limit determination circuitry 14 includes two limit determination circuits, the current based power limit determination circuitry 14 and the voltage based power limit determination circuitry 18. It should be appreciated, however, that this is only exemplary of the preferred embodiment for carrying out the present invention. Indeed, in one alternative embodiment, depicted in FIG. 2, only the current based power limit determination circuitry 14 is used. And, in a second alternative embodiment depicted in FIG. 3, only the voltage based power limit determination circuitry 18 is utilized.
- FIG. 4 depicts the methodological process flow 100.
- the parenthetical references to "STEPs" correspond to the particular reference numerals of the methodological flow 100 depicted in FIG. 4.
- the process 100 starts when the motor load 30 is, in some way, commanded to be energized (STEP 102).
- a current magnitude necessary to rotate the motor load 30 at the desired speed and direction is determined, and a current command (ICOM) is generated on the basis of this determination (STEP 104).
- ICOM current command
- the motor load 30 is energized (STEP 106), and signals representative of the voltage and current magnitudes supplied from the main power distribution bus 20 to the motor load 30 is determined (STEP 108).
- the magnitude of the commanded current (ICOM) and determined maximum allowable current command (ICOM MAX ) are compared, and the lesser of the two is output as the power limited current command signal (ICOMnmit), which is used to determine the appropriate voltage command (STEP 112).
- the voltage magnitude necessary to provide the commanded current is determined based on (ICOMumit) and the determined supply current, and a voltage command (VCOM) is generated on the basis of this determination (STEP 114).
- the maximum allowable voltage (VCOM MA X) corresponding to the determined supply current, which ensures that predetermined power level is not exceeded, is then determined (STEP 116).
- the magnitude of the commanded voltage (VCOM) and determined maximum allowable voltage command (VCOM MAX ) are compared, and the lesser of the two is output as the power limited voltage command signal (VCOM ⁇ m i t ) (STEP 118), which is used to limit the power drawn from the main power distribution bus 20 to the maximum allowable power (STEP 122).
- FIGS. 5A-5E are various graphs depicting an operation of a thrust reverser actuation system during the thrust reverser deployment operation.
- FIG. 5 A depicts the displacement of a thrust reverser versus time
- FIG. 5B depicts the aerodynamic forces on the thrust reverser versus time
- FIG. 5C depicts motor speed versus time
- FIG. 5D depicts the power drawn from the main power supply bus 20 by the motor load 30; and FIG. 5E depicts the absolute valve of motor power (e.g., based on torque and speed) of the motor load 30.
- the predetermined maximum power level is the design power of the main power supply bus 20, which is 15.5 kW per motor load 30, and the desired steady-state rotational speed of the motor 32 is 16,000 revolutions-per- minute (rpm).
- the dotted lines on the graphs depict the system response without the active power limiting method of the present invention. It will be appreciated that the system values depicted and described herein are only exemplary of one particular preferred embodiment, and that other values may be chosen based on the specific design criteria of the system employing the present invention.
- the input power (FIG. 5D), motor speed (FIG 5C), and motor output power (FIG. 5E) continue to steadily increase, to overcome the resistive aerodynamic forces (FIG. 5B) and displace the thrust reversers (FIG. 5 A), until time t 2 .
- power drawn from the main power distribution bus 20 reaches the predetermined maximum power level which, as noted above, is 15.5 kW.
- the power drawn is clamped at 15.5 kW, which results in a concomitant clamping of the motor output power (FIG. 5E).
- the thrust reversers begin to move toward the deployed position (FIG. 5A)
- the resistive aerodynamic forces acting against their movement begins to decrease (FIG. 5B).
- the input power is clamped at 15.5 kW
- the rotational speed of the motor 30 continues to rise toward the desired steady-state rotational speed of 16,000 rpm, albeit at a reduced rate of acceleration (FIG. 5C).
- the present invention is not so limited. Indeed, the present invention may be incorporated in numerous environments where it is desirable and/or necessary to limit the power drawn by a load, such as a motor load, to a predetermined level.
- a load such as a motor load
- an electrically propelled automobile is another environment for which the present invention is useful.
- the disclosure explicitly describes the load being supplied as a motor load, the present invention is not limited thereto. Rather, the present invention is useful with many other types of electrical loads.
- circuit components of the present invention may be formed of either discrete components, or incorporated into a single integrated circuit. Additionally, while the functional blocks are depicted and described as separate physical blocks, this is only done for clarity in presenting and describing the invention. It will be appreciated that two or more of the functional blocks may be combined into a single physical structure. Moreover, the present invention is not limited to a particular motor control scheme, such as the speed control scheme explicitly described herein as a preferred embodiment, but includes other control schemes, such as those that directly control torque (e.g., a "dq" type of control scheme). Furthermore, the process carried out by the circuit components may be realized using software driven devices, or carried out using analog devices and signals, or a combination of both.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002593188A JP2004533197A (en) | 2001-04-06 | 2002-04-04 | System and method for actively limiting power drawn from a distribution bus |
EP20020749514 EP1373009A1 (en) | 2001-04-06 | 2002-04-04 | System and method for actively limiting the power drawn from a power distribution bus |
CA 2443780 CA2443780A1 (en) | 2001-04-06 | 2002-04-04 | System and method for actively limiting the power drawn from a power distribution bus |
BR0208702A BR0208702A (en) | 2001-04-06 | 2002-04-04 | System and method for actively limiting the power consumption of a power distribution bus by one or more electrical loads to a previously determined maximum energy level |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/828,561 | 2001-04-06 | ||
US09/828,561 US6792338B2 (en) | 2001-04-06 | 2001-04-06 | System and method for actively limiting the power drawn from a power distribution bus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002096696A1 true WO2002096696A1 (en) | 2002-12-05 |
Family
ID=25252158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/010475 WO2002096696A1 (en) | 2001-04-06 | 2002-04-04 | System and method for actively limiting the power drawn from a power distribution bus |
Country Status (6)
Country | Link |
---|---|
US (1) | US6792338B2 (en) |
EP (1) | EP1373009A1 (en) |
JP (1) | JP2004533197A (en) |
BR (1) | BR0208702A (en) |
CA (1) | CA2443780A1 (en) |
WO (1) | WO2002096696A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10752252B2 (en) | 2013-03-15 | 2020-08-25 | Honda Motor Co., Ltd. | System and method for responding to driver state |
Families Citing this family (7)
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US7360100B2 (en) * | 2003-08-01 | 2008-04-15 | Ge Medical Systems Global Technology Company, Llc | Intelligent power management control system and method |
US7486053B2 (en) * | 2005-06-17 | 2009-02-03 | Hamilton Sundstrand Corporation | Power manager for an electrical power generator |
US7447923B2 (en) * | 2005-08-19 | 2008-11-04 | International Business Machines Corporation | Systems and methods for mutually exclusive activation of microprocessor resources to control maximum power |
US8547675B2 (en) * | 2006-11-07 | 2013-10-01 | Hamilton Sundstrand Corporation | Solid state power controller with lightning protection |
US20120013278A1 (en) * | 2010-07-13 | 2012-01-19 | Honeywell International Inc. | Resistorless dynamic motor braking system and method |
EP2702657B1 (en) * | 2011-04-27 | 2016-02-24 | Steffes Corporation | Energy storage device control |
WO2015116408A2 (en) | 2014-01-31 | 2015-08-06 | Steffes Corporation | Energy storage device power consumption management |
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- 2002-04-04 BR BR0208702A patent/BR0208702A/en not_active IP Right Cessation
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- 2002-04-04 EP EP20020749514 patent/EP1373009A1/en not_active Withdrawn
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US10752252B2 (en) | 2013-03-15 | 2020-08-25 | Honda Motor Co., Ltd. | System and method for responding to driver state |
US10759438B2 (en) | 2013-03-15 | 2020-09-01 | Honda Motor Co., Ltd. | System and method for responding to driver state |
US10759436B2 (en) | 2013-03-15 | 2020-09-01 | Honda Motor Co., Ltd. | System and method for responding to driver state |
US10759437B2 (en) | 2013-03-15 | 2020-09-01 | Honda Motor Co., Ltd. | System and method for responding to driver state |
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Also Published As
Publication number | Publication date |
---|---|
EP1373009A1 (en) | 2004-01-02 |
JP2004533197A (en) | 2004-10-28 |
BR0208702A (en) | 2004-06-22 |
US20020147529A1 (en) | 2002-10-10 |
CA2443780A1 (en) | 2002-12-05 |
US6792338B2 (en) | 2004-09-14 |
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