单相并联逆变器的并网和孤岛控制策略

摘要

基于并网和孤岛控制原理，研究了两台逆变器并联系统的并网和孤岛控制策略。在并网运行时采用电流闭环控制，通过准PR调节器实现零稳态误差调节；在孤岛运行模式时采用下垂控制和虚拟电感实现功率均分和环流抑制目标，并在下垂控制基础上提出了一种混合滤波器平均功率提取方法。仿真结果表明，在孤岛运行模式下，与传统提取方法相比，采用混合滤波器平均功率提取方法能够有效抑制功率振荡，提高系统电能质量。%Based on the grid-connected and islanding control principle, this paper studied the grid-connected and islanding control strategy of the system with two parallel inverters. The current closed-loop control was adopted at the time of grid-connected operation. The standard PR regulator was used to realize zero steady state error regulation. In the islanding mode, the droop control and virtual inductance methods realized the targets of power sharing and circulating current suppression. On the basis of the droop control, this paper proposed a kind of average power extraction method with a hybrid iflter. The simulation results show that under the isolated island operation mode, compared with the traditional extraction method, the average power extraction method adopting the hybrid iflter could suppress the power vibration effectively, raising the system power quality.