并網(wǎng)光伏電站LVRT特性對(duì)升壓變壓器繼電保護(hù)的影響
王冰冰
(南京理工大學(xué) 自動(dòng)化學(xué)院,江蘇 南京 210094)
摘 要:并網(wǎng)光伏電站具備低電壓穿越能力,對(duì)光伏電站的故障電流特性起決定性作用,給電網(wǎng)繼電保護(hù)造成影響?;赑SCAD/EMTDC平臺(tái)搭建光伏電站并網(wǎng)模型,研究光伏系統(tǒng)的故障電流特性;針對(duì)光伏電站升壓變壓器的繼電保護(hù)配置方案,分析光伏電站對(duì)其動(dòng)作特性的影響。仿真結(jié)果表明,在故障初期,二次諧波制動(dòng)會(huì)短暫閉鎖差動(dòng)保護(hù),同時(shí)光伏電站的無(wú)功電流會(huì)降低保護(hù)靈敏度;光伏電站容量增大,保護(hù)靈敏度也有所增大。
關(guān)鍵詞:光伏電站;低電壓穿越;故障特性;二次諧波制動(dòng);靈敏度
中圖分類號(hào):TM401;TM615 文獻(xiàn)標(biāo)識(shí)碼:A 文章編號(hào):1007-3175(2019)08-0011-06
Influence of Grid-Connected Photovoltaic Station with Low Voltage Ride-Through Capability on Step-Up Transformer Relay Protection
WANG Bing-bing
(School of Automation, Nanjing University of Science and Technology, Nanjing 210094, China)
Abstract: The low voltage ride-through capability plays a decisive role in the characteristic of failure current in grid-connected photovoltaic power station and has impacts on the grid relay protection. A model of photovoltaic power station connected with the grid was built on PSCAD/EMTDC, and the failure current characteristics were studied. Aiming at the configuration scheme of relay protection of the step-up transformer, this paper analyzed the influence of photovoltaic power station on its performance characteristics. The simulation results show that the secondary harmonics braking will temporarily close the differential protection at the beginning of the fault. The reactive current in a photovoltaic power station will reduce the sensitivity of the protection. The capacity of photovoltaic power station increases and the sensitivity of the protection increases accordingly.
Key words: photovoaltaic power station; low voltage ride through; fault characteristics; secondary harmonics restraint; sensitivity
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