直流微电网改进虚拟直流电机控制策略

DC Microgrid Improved Virtual Direct Current Motor Control Strategy

针对已有虚拟直流电机(VDCM)控制增大直流母线电压稳态误差的问题,提出一种改进VDCM控制策略。通过分析传统VDCM模型中阻尼系数对母线电压稳态误差及储能变换器控制系统阻尼特性的影响规律,提出一种去掉阻尼系数环节的改进VDCM控制策略。该控制策略既能提高直流变换器的阻尼特性,又能消除阻尼系数对直流母线电压稳态误差的影响,提升直流母线电压的稳定性。仿真和实验结果表明了改进VDCM控制策略的正确性和优越性。

Aiming at the problem that the existing virtual direct current machine(VDCM)control increases the direct current bus voltage steady-state error,an improved VDCM control strategy is proposed.By analyzing the influence of the damping coefficient on the busbar voltage steady-state error and the damping characteristics of the energy storage converter control system in the traditional VDCM model,an improved VDCM control strategy is proposed to remove the damping coefficient.This control strategy can not only improve the damping characteristics of the direct current converter,but also eliminate the influence of the damping coefficient on the direct current bus voltage steady-state error,and improve the stability of the direct current bus voltage.Simulation and experimental results show the correctness and superiority of the improved VDCM control strategy.