基于双闭环重复控制的并网逆变器的研究

Study on the Dual Closed Loop Repetitive Control Based on Grid Connected Inverter

在并网逆变器中,重复控制算法因其良好的跟踪性能和抗扰能力而得到广泛应用。提出了电流双闭环结构的并网逆变器硬件方案,分析了电流内环的设置对系统抗扰性能的改善和对稳定性的提高,给出了双闭环条件下重复控制算法的设计方法。理论分析和实验表明,基于双闭环重复控制的并网逆变器具有较高的输出电能质量和较低的并网电流谐波畸变率。

Repetitive control algorithm is widely implemented in the grid-connected inverters as its excellent tracing and anti-jamming performances.A grid-connected inverter hardware solution of dual current loop structure is proposed,and it is analyzed that the anti-jamming performance and the stability of the system are improved when the inner current loop is set,a design method of repetitive control algorithm under dual closed loop is also proposed.Theoretical analysis and experimental results verify that the dual closed loop repetitive control based inverter has high output energy quality and low THD of grid-connected current.