低电压穿越(Low Voltage Ride-through, LVRT)是考核光伏逆变器并网性能的一项重要指标。为了实现光伏逆变器在低电压穿越测试过程中交流侧电压与电流的实时监测以及测试结果评价，本文设计了一种基于虚拟仪器技术的光伏逆变器低电压穿越测试系统。介绍了光伏逆变器低电压穿越测试系统的硬件结构和软件设计方案，研究了光伏逆变器低电压穿越测试有功功率恢复和动态无功支撑等关键指标计算方法。在此基础上，通过实例验证了平台具有较高的测量精度。
英文摘要:
Low voltage ride through (Low Voltage Ride-through, LVRT) is an important evaluation index of photovoltaic inverter grid-connected performance. In order to monitor the AC side voltage and current of photovoltaic inverter in real time and evaluate the test results during the LVRT test, a low voltage ride-through test system of photovoltaic inverter based on virtual instrument technology is designed in this paper. The hardware structure and software design scheme of the photovoltaic inverter low voltage ride-through test system are introduced and the critical index calculation method of the photovoltaic inverter active power recovery and dynamic reactive power support in the low voltage ride through test is studied in this paper. An example proves that the system has high precision on this basis.