摘要
针对电网电压不平衡时,模块化多电平换流器(MMC)系统出现网侧电流不对称问题,提出了非线性微分平滑控制方法。根据MMC系统拓扑,建立暂态数学模型,并分别对正、负序系统进行微分平滑性分析。功率外环采用基于功率前馈的微分平滑控制方法,为电流内环提供参考值;电流内环采用基于Lyapunov稳定理论的微分平滑控制方法,能够快速抑制负序电流,实现系统输出电流三相对称。在Matlab/Simulink平台上进行该控制方法和传统矢量控制方法的仿真对比,验证了非线性微分平滑控制方法具有更好的快速性和稳定性。
In the case of the unbalanced grid voltage,modular multilevel converter(MMC)system has an asymmetrical problem with the grid current,and the nonlinear differential flatness control method is proposed in this paper.According to the topology of MMC system,the transient mathematical model is established,and the differential flatness of positive and negative order systems is analyzed.The power outer loop adopts the differential flatness control method based on power feed-forward to provide reference value for the current inner loop.The current inner loop adopts the differential flatness control method based on Lyapunov stability theory,which can quickly suppress the negative sequence current and realize the three-phase symmetry of the system output current.The simulation comparison between the control method and the traditional vector control method on Matlab/Simulink platform verifies that the nonlinear differential flatness control method has better rapidity and stability.
作者
王艳青
薛花
Wang Yanqing;Xue Hua(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China)
出处
《电测与仪表》
北大核心
2020年第12期118-124,130,共8页
Electrical Measurement & Instrumentation
基金
上海市科技创新行动计划项目(16DZ0503300)。
