Multi-loop power control strategy of current source PWM rectifier

Abstract

In the two phase static coordinate system, the power control strategy of the current source PWM rectifier is established based on the instantaneous power theory. This article proposes a reactive power compensation scheme based on ac side filter capacitors, which enables CSR to achieve unit power factor operation under different load conditions. In order to effectively suppress the parallel resonance generated by the LC filter on the input side of the rectifier, a capacitive voltage feedback active damping loop is introduced, and the influence of different damping gains on the system performance is analyzed in detail. The dc side outer loop is converted into a linear time invariant system, the ac and dc side power calculation process is analyzed in detail, and the entire control loop is analyzed using frequency domain method to determine the controller parameters. Finally, the correctness of the control strategy proposed in this article is verified by Matlab/Simulink simulation and experimental prototype test.

Keywords

• Current source PWM rectifier
• Power control
• Reactive power compensation
• Frequency response method
• Harmonic analysis