基于RTDS的光伏发电系统低电压穿越建模与控制策略  

Low Voltage Ride-through Modeling and Control Strategy for Photovoltaic Generation System Based on RTDS

作　　者：郑飞[1] 张军军[1] 丁明昌[1] 

机构地区：[1]中国电力科学研究院,江苏省南京市210003

出　　处：《电力系统自动化》2012年第22期19-24,共6页Automation of Electric Power Systems

摘　　要：基于实时数字仿真器(RTDS)提出了一种光伏发电系统低电压穿越(LVRT)实时数字仿真方案。首先,通过RTDS的大步长模型和小步长模型构建了整套LVRT仿真平台,具体包括电压跌落发生器、光伏阵列、隔离变压器和光伏并网逆变器等。然后,设计了光伏并网逆变器在三相电网电压正常和对称跌落2种运行工况下的LVRT控制策略。最后,以一台250kW光伏并网逆变器为例,进行了LVRT仿真测试和现场检测实验。仿真和实验表明:该RTDS仿真平台能较好地模拟现场检测平台,且所述控制策略在LVRT过程中具有良好的动、静态特性。Based on the real time digital simulator （RTDS）, a low voltage ride-through （LVRT） real time digital simulation scheme is presented for the photovoltaic generation system. A set of LVRT simulation platform including the voltage sag generator, photovoltaic array, isolation transformer and photovoltaic grid-connected inverter, is built by RTDS big step models and small step models. A LVRT control strategy is designed to ensure the photovoltaic grid-connected inverter operate in three- phase grid voltage＇ s normal and symmetrical drop conditions. Finally, the LVRT simulation test and field experiment have been carried out for a 250 kW photovoltaic grid-connected inverter. The simulation and experiment results show that the RTDS simulation platform is able to simulate the on-site testing platform and the proposed control strategy has good dynamic as well as static characteristics in LVRT process.

关 键 词：光伏发电 低电压穿越 实时数字仿真器 电压跌落发生器 并网逆变器 

分 类 号：TM615[电气工程—电力系统及自动化] TM76