This paper investigated of damping of resonance oscillations for grid-side converter with LCL filter for doubly-fed wind power system. Firstly, capacitors parallel with or in series with resistors as reactive damping were analyzed in this paper, and the effect to filtering high order harmonics and power losses for different reactive damping strategies were compared. Secondly, in order to reduce power losses of damping resistors this paper proposed a novel active damping control strategy. The grid-side currents converter with LCL filter were measured and controlled, and capacitor currents were used to regulate converter-side voltage to damping resonance of LCL filter. The proportional links were used to change amplitude of capacitor currents to meet system requirement. Finally, Simulating model and experimental system were set up, and the analyses of theories in the paper are verified by stimulated and experimental results.

国家高技术研究发展计划项目(863计划)(2003AA512022-1)。