摘要：为了提高模块化多电平变流器MMC(modular multilevel converter)的稳定性与动态性能,实现环流抑制,提出基于交流电流和环流双目标调节的无差拍控制。通过MMC单相等效电路的动态方程,设计MMC交流电流分量以及环流分量的无差拍电流预测控制器,并针对实际控制存在的时延问题进行理论分析提出改进措施。通过搭建无差拍控制下模块化多电平变流器的十电平Simulink仿真模型,验证控制策略的有效性。结果表明:通过无差拍控制可以显著提高模块化多电平变流器的稳态和动态性能,且达到环流抑制和均压的目的。

摘要：In predictive direct power control(PDPC)system of three-phase pulse width modulation(PWM)rectifier,grid voltage sensor makes the whole system more complex and ***,third-order generalized integrator(TOGI)is used to generate orthogonal signals with the same frequency to estimate the grid *** addition,in view of the deviation between actual and reference power in the three-phase PWM rectifier traditional PDPC strategy,a power correction link is designed to correct the power reference *** grid voltage sensor free algorithm based on TOGI and the corrected PDPC strategy are applied to three-phase PWM rectifier and simulated on the simulation *** results show that the proposed method can effectively eliminate the power tracking deviation and the grid *** effectiveness of the proposed method is verified by comparing the simulation results.