网侧变流器控制策略的改进

在传统的矢量控制策略下,当风速发生阶跃变化时变流器直流母线电压会产生剧烈波动,从而影响整个风电系统的稳定运行。针对该问题,文章对直驱风电系统网侧变流器控制策略进行改进,提出了基于模糊理论的自整定PI控制策略。为了验证该控制策略的有效性,在Matlab/Simulink环境下建立了容量为2MW的直驱风电系统模型,在阶跃风速情况下进行系统仿真,结果表明模糊PI控制策略能够有效的减小直流侧母线电压的波动。

Under the traditional vector control strategy, when the wind speed changes step by step, the DC bus voltage of theconverter will fluctuate violently, which will affect the stable operation of the whole wind power system. In order to solve this problem,this paper improves the control strategy of grid-side converter in direct-drive wind power system, and proposes a self-tuning PI controlstrategy based on fuzzy theory. In order to verify the effectiveness of the control strategy, a model of direct-drive wind power systemwith capacity of 2MW is established under Matlab/Simulink environment, and the system simulation is carried out under the conditionof step wind speed. The results show that the fuzzy PI control strategy can effectively reduce the DC side voltage fluctuations.