Novel solutions for protection of matrix converter to three phase induction machine

Induction motors are traditionally controlled by standard PWM-VS inverters. An alternative is the matrix converter which consists of nine bidirectional switches. This converter has benefits compared to a standard inverter like sinusoidal input current and bidirectional power flow. The main disadvantage is the lack of a bidirectional switch because such a switch may be done by two transistors and two diodes. An important topic is also protection of the matrix converter and this paper proposes two new components' reduced protection circuits for matrix converters. The number of protection diodes is reduced by 6. Design expressions of the protection circuit are calculated and validated by simulation. The standard protection circuit and the new circuits are demonstrated by simulation to have the same performances. Experimental results on an 8.5 kVA matrix converter show the design expressions are correct. It is concluded that it is possible to reduce the necessary power devices in a matrix converter.

[1]  Jose Espinoza,et al.  A direct frequency converter controlled by space vectors , 1993, Proceedings of IEEE Power Electronics Specialist Conference - PESC '93.

[2]  L. Huber,et al.  Space vector modulator for forced commutated cycloconverters , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[3]  Boon-Teck Ooi,et al.  Direct AC-AC matrix converter based on three-phase voltage-source converter modules , 1993, Proceedings of IECON '93 - 19th Annual Conference of IEEE Industrial Electronics.

[4]  Thomas A. Lipo,et al.  New control strategy for matrix converter , 1989, 20th Annual IEEE Power Electronics Specialists Conference.

[5]  Marco Venturini,et al.  The generalised transformer: A new bidirectional, sinusoidal waveform frequency converter with continuously adjustable input power factor , 1980, 1980 IEEE Power Electronics Specialists Conference.

[6]  Prasad Enjeti,et al.  A critical evaluation of harmonics generated by forced commutated cycloconverters (FCC's) under unbalance , 1990, [Proceedings] IECON '90: 16th Annual Conference of IEEE Industrial Electronics Society.

[7]  A. Alesina,et al.  Analysis and design of optimum-amplitude nine-switch direct AC-AC converters , 1989 .

[8]  Bimal K. Bose,et al.  Power Electronics and Variable Frequency Drives , 1996 .

[9]  C.L. Neft,et al.  Theory and design of a 30-hp matrix converter , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[10]  Paolo Tenti,et al.  Optimum control of N-input K-output matrix converters , 1992 .

[11]  Eduardo P. Wiechmann,et al.  High performance direct frequency converters controlled by predictive current loop , 1995 .

[12]  M. Ehsani,et al.  Control of force-commutated direct frequency changers , 1990, Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting.

[13]  L. Huber,et al.  Digital modulator for forced commutated cycloconverters with input power factor correction , 1992, Proceedings of the 1992 International Conference on Industrial Electronics, Control, Instrumentation, and Automation.