海上风电直流汇集变换器改进型控制策略研究

Research on Control Strategy of Offshore Wind Power DC Collection Converter

针对IPOS-DAB变换器在传统的输入均流下垂控制策略中存在的静态偏差问题,提出了一种改进的输入均流下垂控制策略。根据传统的输入均流下垂控制策略存在静态偏差的原因,在传统的输入均流下垂环节,引入模块输入电流均值来减小输出电压跌落,从而在实现各模块均压/均流的同时,减小了系统的静态偏差;最后通过MATLAB/Simulink进行仿真验证,结果表明,改进后的输入均流下垂控制策略在输入电压发生突变、输出负载突变,以及电感参数不同的情况下,圴能使系统正常稳定地运行,并具有优良的均压效果。

Aiming at the static deviation problem existing in the traditional input current sharing droop control strategy of IPOSDAB converter,an improved input current sharing droop control strategy is proposed.According to the reason for the static devia⁃tion of the traditional input current sharing droop control strategy,in the traditional input current sharing droop link,the module input current average value is introduced to reduce the output voltage drop,so as to realize the voltage/current sharing of each module while reducing the static deviation of the system.Finally,the simulation verification is carried out through MATLAB/Simulink.The results show that the improved input current sharing droop control strategy can make the system operate normally and stably with excellent voltage equalization under the conditions of sudden changes in input voltage,sudden changes in output load and different inductance parameters.