基于LabVIEW的光伏逆变器低电压穿越检测方法研究

低电压穿越(LVRT)能力作为并网光伏逆变器的一项重要能力,关系到整个电网系统的稳定。针对低电压穿越标准要求,设计了一种基于LabVIEW的光伏逆变器LVRT检测系统,设计了专用检测试验平台;通过解析测试标准要求,研究基于测试数据计算基波正序线电压有效值、无功电流等重要参数的方法;利用LabVIEW软件开发自动化低电压穿越检测软件,可实现光伏逆变器LVRT测试过程中交流侧各项参数指标的检测分析和测试结果评估。在此专用检测平台上测试了某光伏并网逆变器的LVRT能力,结果表明此系统自动化程度高、可扩展性强,检测能力满足要求。

Research on low voltage ride through detection method of photovoltaic inverter based on LabVIEW

Low voltage ride through (LVRT) capability, as an important capability of grid-connected photovoltaic inverters, is related to the stability of the entire power grid system. Aiming at the requirements of LVRT standards, this paper designs a LVRT detection system for photovoltaic inverters based on virtual instrument technology, and designs a dedicated detection test platform. By analyzing the requirements of the test standards, this paper studies the calculation of the fundamental positive sequence line voltage based on the test data. Methods of important parameters such as effective value and reactive current; the use of LabVIEW software to develop automated LVRT detection software, that can realize the detection and analysis of the various parameters of the AC inverters AC side during the LVRT test and the evaluation of the test results. The LVRT capability of a photovoltaic grid-connected inverter was tested on this platform. The results show that the system with a high degree of automation, strong scalability and the detection capability meets the requirements.