基于PSCAD/EMTDC的并网光伏电站设计与仿真分析

摘要

Introduction was made to the topological structure of grid-connected photovoltaic (PV) station. This paper established a passive damping control model of iflter capacitor series resistance based on LCL iflter and the values of related components were decided. The dou-ble closed-loop control strategy was drafted for the inverter, so as to track the reference signals. Both normal operation of PV station and the short-circuit fault occurred in the power grid were simulated and analyzed in PSCAD/EMTDC. The results of simulation show the rationality of the iflter parameters design and the effectiveness of the inverter’s control strategy.%介绍了并网光伏电站拓扑结构，建立了基于LCL滤波器滤波电容串联电阻的无源阻尼控制模型，并通过设计方案得出相关元件的参数取值。设计的外环电压、内环电流的并网逆变器双闭环控制策略，实现了对交直流参考信号的准确跟踪。通过在PSCAD/EMTDC软件环境下搭建并网仿真模型，分析光伏电站在正常运行状态以及网侧故障情况下的输出特性，结果验证了滤波器参数设计的合理性及逆变器控制策略的有效性。