基于热点温度仿真的光伏电站变压器容量优化

Optimization of Transformer Capacity in Photovoltaic Power Stations Based on Hotspot Temperature Simulation

光伏电站项目的设计规划中,大多数的主变压器容量都较大。通过分析光伏系统每小时的发电数据与环境的温度状况,结合计算可得出主变每小时的热点温度及对应的热老化参数,进而准确模拟主变的设备使用状况。研究发现:主变的空载运行时长远大于满载时长,空载运行呈现低老化状态,可有效弥补满载运行的快速老化状况,且在可控范围内的满载、过载,不会影响主变设备的绝缘性能。高热点温度引发的主变设备早期损害问题,是主变容量优化设计中的主要影响因素,需加以重视。

In design and planning of photovoltaic power station projects,most of the main transformers have a large capacity.By analyzing the hourly power generation data of photovoltaic system and the temperature conditions of the environment,combined with calculations,the hourly hot spot degree and corresponding thermal aging parameters of the main transformer can be obtained,and then the equipment usage of the main transformer can be accurately simulated.It is found that no-load operation time of the main transformer is longer than full load operation time,and the no-load operation presents a low aging state,which can effectively compensate for the rapid aging situation of full load operation.Moreover,full load and overload within a controllable range will not affect the insulation performance of the main transformer equipment.The early damage problem of main transformer equipment caused by high hot spot degree is the main influencing factor in the optimization design of the main transformer capacity,which deserves serious deliberation.