A current-type PWM rectifier with active damping function

A new control method for current-type pulse-width modulation (PWM) rectifiers which can provide active damping function is presented. This damping function is effective only on the harmonic components of AC input current selectively. Thus steady-state waveform distortion and transient oscillation of the input current are reduced by the active damping effects. The active damping function can be realized by feedback control of an LC filter connected to the AC side of the rectifier, and it does not require any additional components in the main circuits, permitting a simple circuit configuration. The control system of the proposed PWM rectifier is analyzed by using a simple block diagram developed in the present paper. From the analytical results, the influence of the circuit parameters and control delay on the active damping effects and the stability of the operation are clarified to establish the design method. To confirm the effectiveness of the active damping function, some results of basic experiments are included. As an example of application of the active damping function, the proposed rectifier is applied to reduce the harmonic currents generated by conventional rectifiers operating in parallel with the proposed rectifier. Some experimental results in this application are also included.

[1]  Y. Hayashi,et al.  A novel control of a current source active filter for AC power system harmonic compensation , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[2]  Fang L. Luo,et al.  Current Source Optimization in AC-DC GTO Thyristor Converters , 1987, IEEE Transactions on Industrial Electronics.

[3]  T. Kataoka,et al.  State feedback control of current type PWM AC-to-DC converters , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[4]  Y. Sato,et al.  An analysis of voltage spike clamping circuits for current type PWM power converters , 1988, PESC '88 Record., 19th Annual IEEE Power Electronics Specialists Conference.

[5]  Victor R. Stefanovic,et al.  PWM Control Techniques for Rectifier Filter Minimization , 1985, IEEE Transactions on Industry Applications.

[6]  Seshagiri R. Doradla,et al.  A Three-Phase AC-to-DC Power Transistor Converter-Controlled DC Motor Drive , 1987, IEEE Transactions on Industry Applications.

[7]  Teruo Kataoka,et al.  A Pulsewidth Controlled AC-to-DC Converter to Improve Power Factor and Waveform of AC Line Current , 1979, IEEE Transactions on Industry Applications.

[8]  T. Kataoka,et al.  A new control strategy to improve AC input current waveform of high-power parallel connected PWM rectifiers , 1993, Conference Record of the Power Conversion Conference - Yokohama 1993.

[9]  H. Akagi,et al.  A new approach to harmonic compensation in power systems , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[10]  Akiteru Ueda,et al.  A New Speed Control System for DC Motors Using GTO Converter and its Application to Elevators , 1985, IEEE Transactions on Industry Applications.