光伏发电系统并网故障分析及纠正措施
2020-08-25何有山
何有山


摘 要:太阳能取之不尽,用之不竭,清洁安全,对于缓解日趋严峻的能源与环境问题具有重大的战略意义。随着太阳能光伏发电行业的发展,大量逆变型分布式光伏电源接入电网,光伏发电系统并网潜藏的故障逐步暴露。本文分析了工程现场光伏发电系统并网电弧放电和短路故障,然后提出了行之有效的纠正措施,解决了光伏发电系统并网故障,从而最大限度地节约维修费用和减少系统停机损失。
关键词:光伏发电;并网故障;电弧放电;短路故障;纠正措施
中图分类号:TM642文献标识码:A文章编号:1003-5168(2020)20-0145-03
Abstract: Solar energy is inexhaustible, inexhaustible, clean and safe, and has great strategic significance for alleviating the increasingly serious energy and environmental problems. With the development of the solar photovoltaic power generation industry, a large number of inverter-type distributed photovoltaic power sources are connected to the grid, and the potential faults of the photovoltaic power generation system are gradually exposed. This paper analyzed the grid-connected arc discharge and short-circuit faults of the photovoltaic power generation system on the project site, and then put forward effective corrective measures to solve the grid-connected failures of the photovoltaic power generation system, thereby maximizing the maintenance cost and reducing the loss of system shutdown.
Keywords: photovoltaic power generation;grid-connected fault;arc discharge;short-circuit fault;corrective measures
当前,世界能源形势紧迫,能源问题成为世界十大焦点问题之首。在能源日益匮乏的今天,太阳能因取之不尽、用之不竭、清洁安全的特点,对于缓解日趋严峻的能源与环境问题具有重大的战略意义。
随着光伏发电行业的发展,近年来,大量逆变型分布式光伏电源接入电网,光伏发电并网故障也备受关注[1],光伏发电系统并网所产生的故障逐步暴露,如电器短路、电压波动、闪变、逆变器故障停机等,导致光伏发电系统不能正常并网的现象时有发生[2-3]。
逆变器是光伏电站并网中不可缺少的电能转换装置,它的控制技术直接影响光伏发电馈入电网的品质。根据相关国家标准[4]要求,通过10~35 kV电压等级并网的光伏发电功率因数应在超前0.98到滞后0.98范围内连续调节。业内有不少关于逆变器控制策略方面的研究[5-6],逆变器厂家为了追求最大利用容量和最大发电量,常常会将并网逆变器的功率因数设定为0.99。……
