To satisfy the needs of research of grid connected distributed generation systems, this paper develops a high performance multi-functional grid simulator which could provide regulated grid voltage and simulate different power system faults such as instantaneous voltage sag, frequency shift and three-phase unbalance.The simulator could work in four quadrant operations, so that energy generated by distributed systems could flow into grid.The fundamental voltage and harmonic voltage are controlled respectively:multiple feedback loop control scheme is applied in fundamental mode and effective value feedback control scheme is applied in harmonic mede.A DSP platform is used for implementing the control.The Simulation and experimental results verify the functionality of the simulator.%为适应分布式发电并网研究的需要,提出一种多功能电网模拟器.模拟器不仅可以四象限运行以实现电能向电网的回馈,而且可提供三相电网电压输出并模拟如电压跌落、频率偏移、三相不平衡、谐波畸变等各种电网故障情况.为了获得高性能的控制效果,将模拟器的工作模式分为基波模式和谐波模式,分别控制基波和高次谐波:在基波工作模式下采用双环控制,谐波工作模式下采用输出电压有效值反馈控制.系统采用DSP控制,仿真和实验结果表明模拟器性能优良.
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