为使运行人员更加直观快速地评估光伏储能系统的热可靠性,以一个2.5 kW小型光储变换器为对象,基于等效热网络模型,在无弃光限电条件下,研究光伏发电功率和负载需求功率对变换器内功率器件的结温影响规律。结果表明,对于变换器中的单向DC-DC电路而言,其功率器件结温不受变换器负载功率影响,但会随光伏功率的增大而非线性提升。对于变换器中的双向DC-DC电路而言,当储能电池放电时,减小光伏功率和增大负载功率会导致器件结温的非线性提升;而当储能电池充电时,相同条件下的光伏功率和负载功率变化则导致器件结温非线性下降。3阶及以上阶数的多项式模型能够较好描述上述器件结温变化的低阶非线性规律。
Abstract
In order to make the operators evaluate the thermal reliability of photovoltaic energy storage system more intuitively and quickly, taking a 2.5 kW small photovoltaic energy storage converter as the object. Based on the equivalent thermal network model, the influence of photovoltaic power and load demand power on the junction temperature of power devices in the converter is studied under the condition of no light curtailment and power limitation. The results show that the junction temperature of the unidirectional DC-DC converter is not affected by the load power, but increases nonlinearly with the increase of photovoltaic power. For bidirectional DC-DC converter, when the energy storage battery discharges, reducing the photovoltaic power and increasing load power will lead to the nonlinear increase of junction temperature. When the energy storage battery is charged, the variation of photovoltaic power and load power under the same conditions will lead to the nonlinear decrease of device junction temperature. The third-order polynomial model above can well describe the low-order nonlinear law of junction temperature variation of the above devices.
关键词
光伏系统 /
功率变换器 /
功率半导体器件 /
结温 /
损耗 /
热网络模型
Key words
photovoltaic system /
power converters /
power semiconductor devices /
junction temperature /
losses /
thermal network model
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基金
国家自然科学基金青年基金（51607091）; 智能电网保护和运行控制国家重点实验室开放基金课题（SGNR0000KJJS2007613）
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