论文信息 - A new common-mode sinusoidal inverter output filter

A new common-mode sinusoidal inverter output filter

Long cables between a PWM inverter and a motor will result in over-voltage at motor terminals. PWM voltage source inverter generates high d/spl nu//dt and high frequency common-mode voltage, which leads to shaft voltage and bearing current. Conventional inverter output filter may eliminate over-voltage when using very longer cable, but cannot achieve better filtering effects under all kinds of operation conditions for its parameter values are fixed and is useless for decreasing the common-mode voltage. A new common-mode sinusoidal inverter output filter with variable inductors is proposed in this paper to achieve a motor-friendly performance of the PWM voltage source inverter, which can automatically adjust cutoff frequency of the filter and achieve optimizing sinusoidal waveforms when operation conditions are varying, and due to the common-mode connection, common-mode voltage is also reduced significantly. Common-mode and differential-mode problems are solved with the same filter configuration. Simulation and experimental results identify the effectiveness of the proposed filter.

Xu Dianguo | Chen Xiyou | Ma Hongfei | Cui Bo

[1] J. Erdman,et al. Effect of PWM inverters on AC motor bearing currents and shaft voltages , 1996 .

[2] A. von Jouanne,et al. Application issues for PWM adjustable speed AC motor drives , 1996 .

[3] Xu Dianguo,et al. Research of inverter output filters for PWM drives , 2001, ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501).

[4] A. von Jouanne,et al. Design considerations for an inverter output filter to mitigate the effects of long motor leads in ASD applications , 1997 .

[5] K. Satoh,et al. Damping circuit to suppress motor terminal overvoltage and ringing in PWM inverter-fed AC motor drive systems with long motor leads , 1998, Conference Record of 1998 IEEE Industry Applications Conference. Thirty-Third IAS Annual Meeting (Cat. No.98CH36242).

[6] P. T. Finlayson,et al. Output filters for PWM drives with induction motors , 1997, Conference Record of 1997 Annual Pulp and Paper Industry Technical Conference.

[7] J. K. Steinke,et al. Use of an LC filter to achieve a motor-friendly performance of the PWM voltage source inverter , 1997 .

[8] Prasad Enjeti,et al. An improved inverter output filter configuration reduces common and differential modes dv/dt at the motor terminals in PWM drive systems , 1998 .