基于VSG的储能功率变流器离网并联控制策略

Grid-off Parallel Control Strategy of Power Conversion System Based on VSG

针对利用虚拟同步机控制进行储能变流器离网并联时存在的功率振荡问题,分析了功率振荡产生的原因,进而提出一种自适应惯性参数调节方法。该方法以虚拟同步机中的惯性参数为控制量,使其能够根据功率变化量自主调节,使得虚拟同步机策略既能实现无互联线并联,又能提高系统的并联动态响应。最终的实验结果进一步验证了所提出控制策略的可行性。

Aiming at the power oscillation problem existing when the power conversion system(PCS)is connected in parallel by using the virtual synchronous generator(VSG),the cause of the power oscillation was analyzed,and an adaptive inertia parameter adjustment method was proposed.The method took the inertia parameter in the virtual synchronous machine as the control quantity,so that it could adjust autonomously according to the power variation,and the virtual synchronous generator strategy not only realized the parallel operation with wireless,but also improved the parallel dynamic response of the system.The final experimental results further validate the feasibility of the proposed control strategy.