一种改进的逆变器并联功率解耦控制策略

摘要

针对传统下垂控制在逆变器并联系统中应用所带来的功率控制耦合及稳定性问题，在分析了传统下垂理论及已有解耦控制方法的基础上，提出了一种基于电压频率幅值变换并加入微分环节的改进的下垂控制策略。电压频率幅值变换实现功率的直接解耦控制，微分环节实现系统的快速动态响应。结合2台单相电压型逆变器搭建了并联系统仿真模型，仿真结果证实了该控制策略的可行性。%The traditional droop control will lead to power control coupling and stability problem when imple-mented in parallel inverters system. On the basis of the analysis of traditional droop control and other present decou-pling methods,a new droop control method with differential block was proposed,which is based on the transformation of the frequency and amplitude of the output voltage. The transformation is used to realize directly decoupled power control and at the same time,the differential block is used to achieve fast dynamic response of the system. Simulation model with two parallel connected single-phase voltage source inverters was built. Simulation results confirm the fea-sibility of the proposed control strategy.