Steady state analysis of an inverter-fed induction motor employing natural commutation

Singh, Bhim; Naik, K. B.; Goel, Ankit

doi:10.1109/63.46006

Cited by 17 publications

(4 citation statements)

References 19 publications

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“…The load angle between the motor phase voltage and the motor current is determined by the motor characteristics, which was about 25 in this simulation. The dc-link current command was set by (5) to minimize the VSI rating. The dc-link current is regulated to a slightly higher value than the motor current amplitude with 30 phase shift angle between the LCI and the motor currents, leading to a 56% rating factor .…”

Section: Simulation and Experimental Resultsmentioning

confidence: 99%

“…In addition, is the lagging power factor angle of the induction motor, which is detectable. Then, the dc-link current value, which minimizes the rating factor, can be obtained by (4) This yields a dc-link current command given by (5) Equation (5) allows the dc-link current control to achieve the minimum VSI rating and the maximum LCI rating, based on the motor current and phase shift between the motor current and the LCI output current. This dc-link current control algorithm is implemented by the buck converter.…”

Section: Buck Converter Control Principlementioning

confidence: 99%

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A Hybrid Converter System for High-Performance Large Induction Motor Drives

Kwak

Toliyat

2005

IEEE Trans. On Energy Conversion

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A hybrid converter system employing a combination of a load-commutated inverter (LCI), a dc-dc buck converter, and a voltage-source inverter (VSI) is proposed for the large induction motor drives. The VSI ensures the safe commutation of the LCI with active commutation angle control over all speed regions. By replacing capacitor banks and a forced dc-commutation circuit, this system can eliminate all drawbacks related to these circuits in the conventional LCI-based induction motor drives. Sinusoidal motor current and voltage waveforms are achieved with the VSI providing the reactive and harmonic power to the motor, resulting in high-performance drives. The buck converter enables both the VSI and the LCI to be fed from the single-diode rectifier. As a result, the dc-link inductor size can be reduced and the LCI is operated without the controlled rectifier. In addition, faster dynamic response can be obtained through the VSI and the buck converter operation. Finally, the buck converter performs the dc-link current control to ensure minimum VSI rating. The feasibility of the proposed hybrid circuit for the high-power drive systems is verified by computer simulation for a 500-hp induction motor. Experimental results are also included for a 1-hp induction motor laboratory setup controlled by the proposed hybrid system.

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Section: Simulation and Experimental Resultsmentioning

confidence: 99%

Section: Buck Converter Control Principlementioning

confidence: 99%

A Hybrid Converter System for High-Performance Large Induction Motor Drives

Kwak

Toliyat

2005

IEEE Trans. On Energy Conversion

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“…On the other hand, the load power factor angle (θ) between the motor phase voltage and the motor phase current is determined by the motor characteristics, which is about 30° in this simulation. The dc link current command I dc * was set by (5) in order to minimize the voltage source inverter rating. It is noticed that the dc link current I dc is regulated to about 18% higher value than the motor current amplitude I om with 40° phase shift angle between the LCI and the motor currents.…”

Section: Simulation Resultsmentioning

confidence: 99%

A novel hybrid solution for load commutated inverter-fed induction motor drives

Kwak¹,

Toliyat²

38th IAS Annual Meeting on Conference Record of the Industry Applications Conference, 2003.

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A novel, hybrid solution employing a combination of a load-commutated inverter and a voltage-source inverter is proposed for the induction motor drives. By avoiding the use of output capacitors and a forced dc-commutation circuit, this solution can eliminate all disadvantages related with these circuits in the conventional load commutated inverter based induction motor drives. In addition, improved quality of output current waveforms and faster dynamic response can be achieved. The proposed hybrid scheme features the following tasks: 1) the safe commutation angle for the load commutated inverter, controlled by the voltage source inverter in all speed region of the induction motor and 2) a dc-link current control loop to ensure minimum voltage source inverter rating. Advantages of the proposed solution over the conventional load commutated inverter based induction motor include the followings: 1) sinusoidal motor phase current and voltage based on the instantaneous motor speed control; 2) fast dynamic response by the voltage source inverter operation; 3) elimination of motor circuit resonance and motor torque pulsation. The feasibility of the proposed hybrid circuit for the high power drive system is verified by computer simulation for a 500 Hp induction motor. Experimental results are also under way in our laboratory to show the validity of the proposed technique.

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“…This type of CSI has been called a load commutated CSI (LCCSI). [3,4] The analysis of this LCCSI-fed induction motor system does not seem to be thoroughly established, especially in view of dynamic stability. Considering the fact that the speed sensor is not necessary for the industry applications not requiring a precise speed control, a stator voltage control system for the LCCSI-fed induction motor is studied and the control loops making the system stable are investigated.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a load commutated CSI-fed induction motor drive

Song

Yoon

Kim

et al.

[Proceedings] APEC '91: Sixth Annual Applied Power Electronics Conference and Exhibition

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This paper presents a systematic study for the induction motor drive system employing a load commutated current source inverter(LCCS1). The steady state characteristics of a LCCSI-fed induction motor are shown to be. the intermediate characteristics between the voltage source inverter (VSI) and the auto sequentially commutated current source inverter (ASCI). The dynamic characteristics of the LCCSI-fed induction motor are also investigated using a linearized model. A study through the pole / zero locations of the linearized system shows that a V/Hz ratio control loop plays an essential role in the stabilizaton of the system.

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Steady state analysis of an inverter-fed induction motor employing natural commutation

Cited by 17 publications

References 19 publications

A Hybrid Converter System for High-Performance Large Induction Motor Drives

A Hybrid Converter System for High-Performance Large Induction Motor Drives

A novel hybrid solution for load commutated inverter-fed induction motor drives

Analysis of a load commutated CSI-fed induction motor drive

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