分布式电源与电网并联运行逆变系统的设计

Inverting Control System for Parallel Operation of Distributed Generation

在分布式发电装置与电网并联运行模式下,通过分析逆变型分布式电源的"负荷"特性,提出基于功率电流双环控制策略的逆变系统。通过合理选取功率控制环、电流控制环、软件锁相环的PI控制器参数,可以使得分布式发电并网逆变装置具有良好的稳态及动态性能。Matlab仿真模型表明,该控制系统能较好地维持逆变型分布式电源恒功率电压源的拟负荷外特性,控制灵活,反应迅速。

Under the grid-connected mode, the DGS has fixed as a ＂load＂. According to this idea, dual control loops for out power and current is chosen as the control strategy. By optimize designing the PI parameters of the average power control loop, current control loop and soft-PLL loop, the system for parallel operation of distributed generation possesses a great performance of stable and dynamic responses. The Matlab simulation model of the inverter-based grid-connected DGS has established, it shows that the designed control system can properly maintain the constant power voltage source external characteristics of DG and is flexible.