基于RTDS的光伏发电系统对称跌落低电压穿越无功控制策略

Reactive Control Strategy for Symmetrical Low Voltage Ride Through of Photovoltaic System Based on RTDS

分析了光伏发电系统有功、无功功率解耦控制,在RTDS实时仿真系统平台搭建了DC-DC和DC-AC两级光伏逆变器模型。提出了一种新型的光伏发电系统的低电压穿越控制策略。在电网对称跌落故障情况下,光伏发电系统向电网输出一定的无功功率,支持电网电压恢复,节省无功设备投入。通过在RTDS实时仿真系统平台仿真及实验验证了控制策略的可行性和有效性。

The active and reactive power decoupling control of photovoltaic system is analyzed in this paper. The DCDC and DC-AC duel-stage PV inverter model are built on the platform of RTDS real-time simulation system. A new control strategy for PV system low voltage ride through( LVRT) is proposed. In the case of symmetrical grid drop fault,PV system outputs some reactive power to the grid for voltage restore without more reactive power equipment installation. The feasibility and effectiveness of the control strategy is verified by simulation and experiment on the RTDS real-time simulation system platform.