摘要
为提高基于LCL滤波器拓扑的风电变流器系统稳定性,对变流器的谐振阻尼策略进行了研究。通过对LCL滤波的变流器电流闭环特性分析,提出了一种新型的有源阻尼策略。利用电容电流和比例环节对电网电流闭环极点进行配置,以增大电网电流闭环控制系统的阻尼,抑制谐振发生。为降低采样环节对系统稳定性的影响,提出了利用相位超前滤波器对延迟进行补偿的措施。通过搭建基于LCL滤波器的风力发电系统网侧变流器仿真模型和实验系统,对理论进行了验证。仿真和实验结果证明所提出的控制方案是正确可行的。
The damping strategy of resonance oscillations is investigated to improve the system stability of the grid-side converter with LCL filter in wind power system.Based on the characteristic analysis of its current loop,an active damping control strategy is proposed.The proportion parameter is used to control the pole of capacitor current for increasing the damping of grid current closed loop control system to suppress the resonance oscillations.The phase-leading filter is used to compensate the time delay for decreasing the influence of sampling on system stability.The simulation model the experimental system of wind power system based on LCL filter are built to verify the correctness of theoretic analysis and the feasibility of control strategy.
出处
《电力自动化设备》
EI
CSCD
北大核心
2010年第6期11-15,共5页
Electric Power Automation Equipment
