Research on rotor-side converter based on DSP for double fed wind power generation system

Abstract

The PWM converter which provides a suitable excitation current for the generator is one of the key components of double fed wind power generation system. This paper takes the rotor-side converter in double fed wind power generation system as the research object. The control objective of the grid-side converter is analyzed in this paper. Based on the control objective, the key issues of realizing the control objectives are discussed in this paper. Then a new DSP-based implementation method of the rotor-side converter is proposed. The mt-coordinates mathematical model of rotor-side converter is established in this paper. Based on the mathematical model and the control objective, control strategy for rotor side PWM converter is proposed, including voltage control strategy pre-grid and PQ decoupling control strategy in grid-connected operation mode. At last, the control strategy is realizing by DSP. Simulation platform for 11kw double feed wind power generation system is built for experimental research on the rotor-side converter. Experimental result has fully proved the validity of control strategies and satisfactory control performance has been achieved. Experimental waveforms are given in the paper.