摘要
海上风电变流器采用封闭式柜体及水冷散热设计,以适应海上高湿度及盐雾的环境要求。当风速突然减小,风机发电功率骤降时,冷却水和散热器温度随之快速下降;但是柜内空气温度由于散热条件下降缓慢,散热器等成为潜在的冷点。当冷点温度降到柜内空气凝露点温度以下时,将发生冷凝现象,表面形成的露水会损坏变流器电气和机械部件,甚至导致短路故障。针对目前兆瓦级海上风电变流器的并联型拓扑结构,提出一种基于无功环流的主动热控制策略,用以调节冷点的温度始终高于柜内空气凝露温度。对所提出的方法进行了建模和理论分析,并通过3MW风力发电系统的仿真和试验平台测试,验证控制策略的有效性。
Offshore wind power converters are usually installed in a closed cabinet equipped with water cooling to meet the requirements of high humidity and salt spray prevention.When the wind speed suddenly decreases and the output power decreases dramatically,the temperature of the cooling water and heatsinks decreases rapidly.However,the temperature of the air in the cabinet drops slowly due to its heat dissipation condition.Therefore,when the heatsink and water pipes’temperature drops below the air dew point temperature in the cabinet,the condensation will occur;and the dew formed on the surface will damage the electrical and mechanical components of the converter,even lead to short circuit faults.In view of parallel topology of MW level offshore wind power converter at present,an active thermal control strategy was proposed based on reactive power circulating current.Through this thermal control technology,the temperature of the coldest point can be always higher than the air dew point temperature in the cabinet.Therefore,anti-condensation was achieved without other external devices such as a heater or dehumidifier.In this paper,the proposed method was modeled and theoretically analyzed,and the validity of the control strategy was verified by the simulation and test platform of 3 MW wind power generation system.
作者
张建文
陈根
蔡旭
施刚
ZHANG Jianwen;CHEN Gen;CAI Xu;SHI Gang(Wind Power Research Center,School of Electronic Information and Electrical Engineering,Shanghai Jiao Tong University,Minhang District,Shanghai 200240,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2019年第9期2748-2757,共10页
Proceedings of the CSEE
基金
国家自然科学基金项目(5150070025)~~
关键词
海上风电变流器
可靠性
电热模型
主动防凝露
主动热控制
offshore wind power converter
reliability
electro-thermal model
active anti-condensation
active thermal control
