IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0551109
(2009-08-31)
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등록번호 |
US-8264191
(2012-09-11)
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발명자
/ 주소 |
- Ranganathan, Vilianguppam Thathachary
- Ranganathan, legal representative, Sowmithri
- Banerjee, Debmalya
|
출원인 / 주소 |
- Indian Institute of Science
|
대리인 / 주소 |
McDonnell Boehnen Hulbert & Berghoff LLP
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
4 |
초록
▼
A motor drive system using a current source inverter (CSI) for providing the main power and an active filter for providing the reactive power and harmonics is disclosed. The CSI can be a load-commutated inverter (LCI) build using silicon-controlled rectifiers (SCRs), while the active filter can be b
A motor drive system using a current source inverter (CSI) for providing the main power and an active filter for providing the reactive power and harmonics is disclosed. The CSI can be a load-commutated inverter (LCI) build using silicon-controlled rectifiers (SCRs), while the active filter can be based on a voltage-controlled inverter. An LCI circuit comprising of SCRs, wherein CSI is autosequentially turned off is provided. In other words, the negative voltage for turning the SCR off is not load dependent. A control scheme for operating the motor drive system through proper control of the SCRs in the LCI circuit is also provided. As presented, the motor drive system is able to feed medium to high voltage motors using a simple circuit, such that low-frequency torque pulsations are eliminated.
대표청구항
▼
1. A motor drive system, comprising: a motor drive terminal configured to receive a first power portion and a second power portion, wherein the first power portion is larger than the second power portion, and wherein the motor drive terminal is effective to provide a motor terminal voltage; a curren
1. A motor drive system, comprising: a motor drive terminal configured to receive a first power portion and a second power portion, wherein the first power portion is larger than the second power portion, and wherein the motor drive terminal is effective to provide a motor terminal voltage; a current-source inverter coupled to the motor drive terminal, wherein the current source inverter is configured to provide the first power portion to the motor drive terminal when the motor terminal voltage is capable of load commutation; and an active filter coupled to the motor drive terminal, wherein the active filter is configured to provide either a startup voltage or a startup current to the motor drive terminal during a startup of the motor drive system, and to provide either a compensating current or a compensating voltage as the second power to the motor drive terminal when the motor terminal voltage is capable of load commutation. 2. The motor drive system of claim 1, wherein the active filter is a voltage-source inverter. 3. The motor drive system of claim 2, wherein the voltage-source inverter has a switching frequency in the range of 5 to 10 kilo-Hertz. 4. The motor drive system of claim 1, wherein the current-source inverter has a switching frequency in the range of 0 to 60 Hertz. 5. The motor drive system of claim 1, wherein the current-source inverter is implemented using silicon-controlled rectifier devices. 6. A current-source inverter circuit for a motor drive system comprising: a direct current source;a reference current, wherein the reference current defines a switching signal to control the current-source inverter;a first silicon-controlled rectifier connected in series with a second silicon-controlled rectifier, wherein a cathode of the first silicon-controlled rectifier is connected to an anode of the second-silicon-controlled rectifier at a first node; anda third silicon-controlled rectifier connected in series with a fourth silicon-controlled rectifier; wherein a cathode of the third silicon-controlled rectifier is connected to an anode of the second silicon-controlled rectifier at a second node; wherein the anodes of the first and third silicon-controlled rectifiers are coupled to the direct current source; wherein the cathodes of the second and fourth silicon-controlled rectifiers are coupled to the reference current; and wherein switching on the third silicon-controlled rectifier results in the switching off of the first silicon-controlled rectifier. 7. The current-source inverter circuit of claim 6, further comprising a fifth silicon-controlled rectifier connected in series with a sixth silicon-controlled rectifier; wherein the cathode of the fifth silicon-controlled rectifier is connected to the anode of the sixth silicon-controlled rectifier at a third node; wherein the anode of the fifth silicon-controlled rectifier is coupled to the direct current source and the cathode of the sixth silicon-controlled rectifier is coupled to the reference current; and wherein the first node, second node and third node provide a three-phase input signal to a motor. 8. The current-source inverter circuit of claim 6 further comprising a switching frequency in the range of 0 to 60 Hertz. 9. A control system for controlling the operations of a motor drive system, comprising: an estimator configured to calculate estimated magnitudes and positions of a rotor flux of an induction motor based on signals from a motor terminal of a motor drive system;a speed control configured to provide first motor current information based on signals received from the estimator;a flux control configured to provide second motor current information based on signals received from the estimator;a current reference generator configured to provide reference current information based on signals received from the motor terminal, the speed control, the flux control, and the estimator;an active filter current control configured to provide active filter control information based on signals from the motor terminal and the estimator;a VSI in-phase sine triangle pulsewidth modulator (IP-SPWM) configured to control transistors in an active filter in the motor drive system based on signals received from the active filter current control;a DC control configured to provide DC control information based on signals from a DC link inductor in the motor drive system and signals received from the current reference generator;a CSI gate configured to control a current-source inverter in the motor drive system based on signals received from the current reference generator; anda rectifier gate configured to control thyristors in an inverter in the motor drive system based on signals received from the DC control. 10. The control system of claim 9, wherein the signals from the motor terminal comprise motor current magnitude, motor current phase, motor voltage magnitude and motor voltage phase. 11. The control system of claim 9, wherein the signals by the current reference generator to provide the reference current information comprise the first motor current information received from the speed control, the second motor current information received from the flux control, motor current phase information received from the estimator, and voltage phase information received from the estimator. 12. The control system of claim 9, wherein the signals by the active filter current control to provide active filter control information comprise the motor voltage information from the motor terminal of the motor drive system and the estimated magnitudes and positions from the estimator. 13. The control system of claim 9, wherein the signals by the IP-SPWM to control transistors in an active filter comprise the active filter control information received from the active filter current control. 14. The control system of claim 9, wherein the signals by the DC control to provide DC control information comprise DC link current information from the DC link inductor in the motor drive system and the reference current information received from the current reference generator. 15. The control system of claim 9, wherein the signals by the CSI gate to control the current source inverter in the motor drive system comprise the reference current information received from the reference current generator. 16. The control system of claim 9, wherein the signals by the rectifier gate to control the thyristors in the inverter in the motor drive system comprise the DC control information received from the DC control. 17. The control system of claim 9, wherein the current source inverter controlled by the CSI gate is configured to provide a main portion of the power to motor drive terminal, and the active control controlled by the IP-SPWM functions as a harmonic and reactive compensator. 18. The control system of claim 17, wherein the active filter controlled by the IP-SPWM is configured to provide the main portion of the power to the motor drive when a motor drive voltage of the is not high enough for load commutation.
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