摘要
局部遮荫是光伏发电系统中普遍存在的现象,会造成阵列失配和热斑效应,不仅会影响光伏发电系统的输出功率,还会造成安全和可靠性问题。提出了一种光伏阵列的连接方式:CTCT结构(complex-total-cross-tied array),在保持输出功率不变的情况下,监测发电系统的工作状态。配合一定数量的电流传感器,可以确定发生热斑现象的光伏电池板的位置。文中还推导了光伏电池板总数N、分辨度L和电流传感器数量X三者之间关系公式。在光伏电池板的数量已知的条件下,通过合理选择分辨度的大小,确定电流传感器的需要数量,最终达到用尽可能少的电流传感器来检测出发生热斑现象的光伏电池板的位置。
Partially shaded conditions are common in all kinds of PV systems. The mismatch phenomenon such as partial shade not only affects the power generated by solar system, but also leads to security and reliability problem. As to detecting the occurrence of Hot Spot, this paper presents a new type of photovoltaic （PV） arrays connection： CTCT structure （complex-total-cross-tied array）. In the array of CTCT-type PV cells, by adding a certain number of current sensors, comparing the current can find the location of PV cells that have Hot Spot. This paper derives the formula between the total number of solar panels in parallel, the resolution and the total number of current sensors. With as little as possible to minimize the current sensor, detect the precise location of PV cells that have Hot Spot.
出处
《电子测量与仪器学报》
CSCD
2010年第2期131-136,共6页
Journal of Electronic Measurement and Instrumentation
基金
国家重点基础研究发展计划(编号:2009CB219700)资助项目
天津市科技支撑重点项目(编号:09ZCGYGX01100)资助项目
