[특허]Mitigation of harmonic currents and conservation of power in non-linear load systems

Mitigation of harmonic currents and conservation of power in non-linear load systems 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H02P-027/16 G05F-001/70
출원번호	US-0018139 (2011-01-31)
등록번호	US-8564240 (2013-10-22)
발명자 / 주소	Garza, Filiberto D.
출원인 / 주소	Power Conservation Ltd.
대리인 / 주소	Griggs, Scott T.
인용정보	피인용 횟수 : 0 인용 특허 : 42

초록 ▼

An AC power controller system applies three-phase AC operating power to an induction motor that drives a non-linear mechanical load. A primary low pass filter is connected in series between branch phase conductors and a power controller of the type that uses gate-controlled switching thyristors for controlling power to the motor. KVAR capacitors connected between the power controller and the induction motor phase windings form a secondary low pass filter across the controller output terminals. The primary and secondary low pass filters isolate the power controller and induction motor with respect to spurious noise and harmonics generated by local as well as remote sources, and also improve real power transfer efficiency from the power generating source to the induction motor by transforming the effective impedance of the power source and induction motor load.

대표청구항 ▼

1. A power controller system including one or more supply input terminals for receiving AC voltage from one or more supply phases of an AC power source, and one or more supply output terminals for conducting AC current to one or more stator phase windings of an AC induction motor, comprising in combination: an electronic power controller including one or more power input terminals for receiving AC voltage from one or more of the controller system supply input terminals, one or more power output terminals electrically connected for conducting AC current to one or more of the controller system supply output terminals, and switching means coupled between the power input terminals and power output terminals for controlling the conduction of current to one or more of the system supply output terminals;a primary low pass filter circuit including one or more input terminals coupled to one or more of the supply input terminals and one or more output terminals coupled to one or more power input terminals of the electronic controller;one or more capacitors connected in shunt phase to neutral relation across one or more of the controller power output terminals; andthe electronic power controller comprising first and second gate-controlled switches, each switch having a respective control gate and the switches being connected in parallel, opposing polarity relation with each other between a first node and a second node, for each phase of the AC voltage, wherein the first node is electrically coupled to one of the system supply input terminals and the second node is electrically coupled to one of the system supply output terminals. 2. A power controller system according to claim 1, wherein the capacitance value of each shunt capacitor is selected and coordinated with the inductance value of one or more stator phase windings of an induction motor that is to be connected to the power controller system, thereby forming in combination one or more secondary low pass filter circuits when so connected. 3. A power controller system according to claim 1, wherein the capacitance value of each shunt capacitor is selected and coordinated with the inductance value of one or more stator phase windings of an induction motor that is to be connected to the power controller system, thereby transforming the effective load impedance presented by an induction motor when so connected into an electrical impedance that is comparable to the effective source impedance presented on the output of the primary low pass filter circuit when the primary low pass filter circuit is coupled to an AC power source. 4. A power controller system according to claim 1, wherein each shunt capacitor is rated for kilovolt ampere reactive service. 5. A power controller system as set forth in claim 1, wherein the primary low pass filter circuit comprises one or more low pass LC filters connected between one or more of the supply input terminals and one or more of the power input terminals. 6. A method of controlling the application of AC operating voltage from a power source in one or more phases of AC voltage to one or more stator phase windings of an AC induction motor to match the power requirements of a mechanical load being driven by the motor, the method comprising the following steps performed for each phase: coupling a gate-controlled switch in series between a selected phase of the AC voltage and a selected motor stator winding wherein the gate-controlled switch includes first and second control gates, one for each polarity of the AC voltage applied to the switch and the motor;alternately triggering the gate-controlled switch into a conductive state during each alternation of the AC voltage;inhibiting the conduction of the gate-controlled switch during each alternation of the AC voltage for a time interval proportional to an interval beginning when the AC voltage of an alternation in the motor winding passes through a first zero-crossing and ending when the corresponding AC current of an alternation in the motor winding passes through a second zero-crossing;filtering the AC supply voltage that is conducted through the gate controlled switch; andconnecting a capacitor in shunt phase to neutral relation across one of the controller power output terminals, wherein the capacitance value of the capacitor is selected and coordinated with the inductance value of one of the stator phase windings thereby forming in combination a secondary low pass filter circuit when so connected. 7. A method of controlling the application of AC operating power according to claim 6, including the step of selecting and coordinating the capacitance value of the shunt capacitor with the inductance value of one of the stator phase windings, thereby providing a secondary low pass filter circuit which transforms the electrical impedance presented by the induction motor into an effective electrical impedance that is comparable to the effective source impedance presented on the output of the primary low pass filter circuit when the primary low pass filter circuit is receiving AC voltage from an AC power source. 8. A method of controlling the application of AC operating power to an AC induction motor according to claim 6, including the step of controlling the operation of the gate controlled switch by an electronic controller, and further including the step of applying the filtered voltage output from the low pass filter as operating power to the electronic controller. 9. A method of controlling the application of AC operating power to an AC induction motor according to claim 6, including the step of selecting the capacitance value of the shunt capacitor in coordination with the inductance value of the stator phase winding to transform the electrical impedance presented by the induction motor into an effective impedance ZL that is substantially in balance with the effective source impedance Zs presented on the output of the primary low pass filter circuit when the primary low pass filter circuit is receiving AC voltage from an AC power source.

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Richardson Robert D. (San Ramon CA) Erdman William L. (Livermore CA), Four quadrant motor controller minimizing distortion index.
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Chen Li (Milwaukee WI) Unsworth Peter (Lewes GB2), Method and apparatus for RMS current measurement in induction motors without a current transformer.
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Beverly Leon H. (Lockport IL) Hance Richard D. (Elburn IL) Kristalinski Alexandr L. (Naperville IL) Visser Age T. (Geneva IL), Method and apparatus for reducing the harmonic currents in alternating-current distribution networks.
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Garza, Filiberto D., Mitigation of harmonic currents and conservation of power in non-linear load systems.
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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Mitigation of harmonic currents and conservation of power in non-linear load systems 원문보기

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