分布式直流并网变流器母线电压稳定性分析与电机效率优化控制

摘要

从功率平衡的角度对分布式直流并网变流器的母线电压稳定性问题进行了分析,基于永磁风力发电机的损耗模型,并以机侧PWM变流器输出功率为优化目标函数,得到了考虑母线电压稳定的永磁风力发电机效率优化方法.通过增加直流侧卸荷电路,并以功率变化量作为其工作的控制条件很好地处理了分布式直流并网变流器的母线电压波动问题,提高了整个系统的稳定性和运行效率.仿真结果和分析表明了方法的有效性.%Stability of busbar voltage was analyzed from the aspect of the power balance for distributed DC grid converter, and the generator efficiency optimization algorithm considering the busbar voltage stability was presented based on the loss model of permanent magnet wind generator and the optimal objective function of generator-side PWM converter output power. The problem of busbar voltage fluctuation was improved with the unloading circuit adapting the power variation as the control condition, and improved the operation stability and efficiency of whole system. Simulation results and analysis show that the effectiveness of the method.