System and method of dynamic regulation of real power to a load
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02P-027/00
H02P-027/04
출원번호
US-0541320
(2009-08-14)
등록번호
US-8232760
(2012-07-31)
발명자
/ 주소
Lu, Bin
Yan, Ting
Fredette, Steven John
Luebke, Charles John
출원인 / 주소
Easton Corporation
대리인 / 주소
Ziolkowski Patent Solutions Group, SC
인용정보
피인용 횟수 :
18인용 특허 :
9
초록▼
A system and method for controlling an AC motor drive includes a control system programmed with an energy algorithm configured to optimize operation of the motor drive. Specifically, the control system input an initial voltage-frequency command to the AC motor drive based on an initial voltage/frequ
A system and method for controlling an AC motor drive includes a control system programmed with an energy algorithm configured to optimize operation of the motor drive. Specifically, the control system input an initial voltage-frequency command to the AC motor drive based on an initial voltage/frequency (V/Hz) curve, receives a real-time output of the AC motor drive generated according to the initial voltage-frequency command, and feedback a plurality of modified voltage-frequency commands to the AC motor drive, each of the plurality of modified voltage-frequency commands comprising a deviation from the initial V/Hz curve. The control system also determines a real-time value of the motor parameter corresponding to each of the plurality of modified voltage-frequency commands, and feeds back a modified voltage-frequency command to the AC motor drive so that the real-time value of the motor parameter is within a motor parameter tolerance range.
대표청구항▼
1. A control system for controlling an AC motor drive, the control system programmed to: input an initial voltage-frequency command to the AC motor drive based on an initial voltage/frequency (V/Hz) curve;receive a real-time output of the AC motor drive generated according to the initial voltage-fre
1. A control system for controlling an AC motor drive, the control system programmed to: input an initial voltage-frequency command to the AC motor drive based on an initial voltage/frequency (V/Hz) curve;receive a real-time output of the AC motor drive generated according to the initial voltage-frequency command;feedback a plurality of modified voltage-frequency commands to the AC motor drive, each of the plurality of modified voltage-frequency commands comprising a deviation from the initial V/Hz curve;determine a real-time value of the motor parameter corresponding to each of the plurality of modified voltage-frequency commands; andfeedback a modified voltage-frequency command to the AC motor drive so that the real-time value of the motor parameter is within a motor parameter tolerance range;wherein the modified voltage-frequency command operates the AC motor drive at a reduced input power as compared to the initial voltage-frequency command, while maintaining the real-time value of the motor parameter within the motor parameter tolerance range. 2. The control system of claim 1 wherein the motor parameter comprises one of a motor rms voltage, a motor rms current, a motor input power, a motor speed, a motor slip, a motor power factor, a motor efficiency, and a motor temperature. 3. The control system of claim 1 programmed to monitor at least one of the real-time value of the motor parameter and a rate-of-change of the real-time value of the motor parameter. 4. The control system of claim 1 programmed to determine a value of at least one of an instability identification parameter and an undesirable operation parameter based on the received real-time output of the AC motor drive, the instability identification parameter and the undesirable operation parameter comprising at least one of a motor voltage, a motor current, a motor torque, a motor speed, a motor slip, a motor power factor, a motor efficiency, and a motor temperature. 5. The control system of claim 4 programmed to: detect a motor instability condition based on the value of the instability identification parameter; andadjust the voltage-frequency command if the motor instability condition is detected. 6. The control system of claim 5 programmed to reset the voltage-frequency command within a period to match one of the initial V/Hz curve, a linear V/Hz curve, and a pre-defined V/Hz curve if the motor instability condition is detected. 7. The control system of claim 4 programmed to: detect an undesirable motor condition based on the value of the undesirable operation parameter; andadjust the voltage-frequency command if the undesirable motor condition is detected. 8. The control system of claim 1 wherein the real-time output of the AC motor drive comprises at least one of a real-time voltage and a real-time current. 9. The control system of claim 8 programmed to detect a motor instability condition and a transient motor condition based on a value or a rate-of-change of the at least one of a motor power factor, efficiency, motor slip, voltage, current, torque, and temperature. 10. The control system of claim 1 programmed to adjust the voltage-frequency command by a predefined value to modify the voltage-frequency command. 11. The control system of claim 1 programmed to: compare the initial voltage-frequency command and the modified voltage-frequency command corresponding to the value of the motor parameter within the motor parameter tolerance zone; anddetermine a motor input power savings based on the comparison. 12. A method for controlling a motor drive output comprising: operating a motor drive according to a static voltage-frequency profile to generate an output power;determining a value of a specified motor parameter corresponding to the static voltage-frequency profile;determining a tolerance zone of the specified motor parameter;selectively modifying the static voltage-frequency profile during operation of the motor drive to generate a reduced motor input power; andoperating the motor drive at a voltage-frequency setting corresponding to a value of the specified motor parameter within the tolerance zone. 13. The method of claim 12 wherein selectively modifying the default voltage-frequency profile comprises: adjusting a voltage-frequency setting during operation of the motor drive such that a reduced motor input power is generated according to a dynamic voltage-frequency profile; anddetermining a value of the specified motor parameter for each voltage-frequency setting of the dynamic voltage-frequency profile. 14. The method of claim 12 wherein determining the value of the specified motor parameter comprises determining the value of one of a motor rms voltage, a motor rms current, a motor input power, a motor speed, a motor slip, a motor power factor, a motor efficiency, and a motor temperature. 15. A motor drive configured to supply power to a load, the motor drive comprising: an inverter designed to provide power to the load; anda controller operationally connected to control operation of the inverter, the controller configured to: adjust a voltage-frequency setting during operation of the motor drive to cause the inverter to operate according to each of a plurality of varied voltage-frequency settings;monitor a real-time value of a motor parameter corresponding to each voltage-frequency setting;identify a tolerance zone for the motor parameter; andcause the inverter to operate according to the voltage-frequency setting such that the motor parameter is within the tolerance zone;wherein adjusting the voltage-frequency setting during operation of the motor drive comprises adjusting at least one of a motor voltage and a motor frequency, so as to minimize at least one of a motor torque and a motor input power. 16. The motor drive of claim 15 wherein the tolerance zone comprises a range of values of the motor parameter corresponding an optimized operation of the motor drive. 17. The motor drive of claim 15 wherein the monitored real-time motor parameter comprises one of an rms voltage, an rms current, a motor speed, a motor slip, a motor power factor, and a motor efficiency. 18. The motor drive of claim 15 wherein the controller is configured to: detect an undesirable motor condition based on a real-time value of at least one of a motor power factor, efficiency, motor slip, voltage, current, torque, and temperature; andupon detection of the undesirable motor condition, reset the voltage-frequency setting to one of an initial voltage-frequency setting, a linear voltage-frequency setting, and a pre-defined voltage-frequency setting.
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