含非线性和不平衡负载的分布式电源并网逆变器控制策略研究

针对带LCL 滤波的并网电压源型逆变器提出了一种多环控制器。该控制器由内环
预测电流控制器、外环电压矢量控制器及电压指令补偿器三部分组成。将该控制器应用于微电网中微型电源的逆变器中，可以有效调节负载端电压，尤其是当系统中含不平衡和非线性负载时，均可以实现零静态误差。最后，给出了分布式电源单独运行和联网运行时的带平衡、不平衡及非线性负载时的仿真分析。
Abstract: A multi-loop controller for gird-connected voltage source converters with LCL
filter is proposed in this paper. The controller consists of three segments – inner predictive current controller, outer voltage vector controller, and the command voltage modifier. The whole controller is applied to converters based DRs in microgrids, and regulate the load terminal voltage with zero steady-state error even under load unbalanced conditions and conditions with non-linear loads. Selected results from simulation studies conducted on the performance of the controller
under balanced, unbalanced and non-linear conditions both in island and grid-connected mode are presented.
关键词：微电网；逆变器；多环控制器；不平衡；非线性负载
Key words: mirogrids; converters; multi-loop controller; unbalanced condition; non-linear
loads