【摘要】 随着一些地区光伏发电供应比例的急剧增加,大规模光伏发电对地区电网稳定性造成的影响愈发显著。电网导则要求光伏逆变器在电网电压跌落瞬间一定范围内不能脱网运行,并对电网电压的稳定和故障穿越做出贡献。为测试光伏发电系统低电压穿越(LVRT)运行能力,需要搭建模拟测试平台来模拟各种电网电压跌落故障,通过分析LVRT技术要求,给出了4种LVRT测试平台设计方案,并对其工作原理和特点进行了对比分析,为在不同的测试环境下更高效地进行LVRT测试工作提供优化方案。更多还原

【Abstract】 When the photovoltaic generation ratio increases rapidly in some areas,the large scale developed photovoltaic plants have more effects on the stability of regional power grid.According to the new grid guideline,the photovoltaic inverter should continue to work even the power grid voltage drops and have the capability to maintain the stability of power grid voltage and to support the grid voltage fault ride through.To test the ability of photovoltaic inverter low voltage ride through(LVRT),the test platform need to be set up which can simulate all kinds of power grid voltage drop fault.On the basis of low voltage through technical requirements,the four kinds of design for LVRT test platform are put forward and respective work principle and characteristics are analyzed.At the same time some test methods are given in order to provide optimization solution for the LVRT test work.更多还原