摘要
光伏电源主动参与配电网无功调控会增大光伏逆变器输出电流,导致绝缘栅双极型晶体管(insulated gate bipolar transistor,IGBT)最大结温升高、结温波动加剧,严重影响光伏电源的可靠运行。为了实现光伏电源无功主动支撑,同时保证光伏电源可靠运行,提出考虑光伏电源可靠性的配电网无功电压调控策略,采用基于任务剖面的IGBT可靠性评估方法,实现光伏逆变器中IGBT可靠性的量化评估;考虑分布式光伏电源无功支撑能力,建立基于IGBT最大结温、配电网网损、光伏有功削减的有源配电网多目标无功优化模型,通过线性化与二阶锥松弛将非线性非凸模型转化为二阶锥规划模型,实现模型快速求解;利用IEEE 33节点典型配电系统与实际配电系统验证了所提策略在提升光伏电源最小寿命、平均寿命、可靠性等方面的有效性。
The active participation of photovoltaic power supply in reactive power regulation of distribution network will increase the output current of photovoltaic inverter,thus the maximum junction temperature of IGBT will increase and the junction temperature fluctuation will be intensified,which will seriously affect the operation reliability of photovoltaic power supply.In order to realize the reactive power active support of photovoltaic power supply and ensure the reliable operation of photovoltaic power supply,this paper proposed a reactive voltage control strategy of distribution network considering reliability of photovoltaic power supply.The IGBT reliability evaluation method based on mission profile was used to realize the quantitative evaluation of IGBT reliability in photovoltaic inverter.Moreover,the reactive power support capability of distributed photovoltaic power supply was taken into account,and a multi-objective reactive power optimization model of active distribution network based on IGBT maximum junction temperature,distribution network loss and photovoltaic active power reduction was established.The nonlinear non-convex model was transformed into a second-order cone programming model by linearization and second-order cone relaxation,and the model was solved quickly.The IEEE 33 node typical power distribution system and actual power distribution system were used to verify the effectiveness of the proposed strategy in improving the minimum lifetime,average lifetime and reliability of photovoltaic power supply.
作者
张波
高远
王磊
李铁成
ZHANG Bo;GAO Yuan;WANG Lei;LI Tiecheng(Key Laboratory of Distributed Energy Storage and Microgrid of Hebei Province(North China Electric Power University),Baoding 071003,China;State Grid Hebei Electric Power Research Institute,Shijiazhuang 050021,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2023年第7期2775-2784,共10页
High Voltage Engineering
基金
河北省自然科学基金(E2022502059)。
关键词
光伏逆变器
IGBT结温
IGBT可靠性
无功优化
有源配电网
photovoltaic inverter
IGBT junction temperature
IGBT reliability
reactive power optimization
active dis-tribution network
