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首页> 外文期刊>Power Electronics, IET >Reduced junction temperature control during low-voltage ride-through for single-phase photovoltaic inverters
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Reduced junction temperature control during low-voltage ride-through for single-phase photovoltaic inverters

机译：降低单相光伏逆变器低压穿越期间的结温控制

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摘要

Future photovoltaic (PV) inverters are expected to comply with more stringent grid codes and reliability requirements, especially when a high penetration degree is reached, and also to lower the cost of energy. A junction temperature control concept is proposed in this study for the switching devices in a single-phase PV inverter in order to reduce the junction temperature stress, and thus to achieve improved reliability of a PV inverter. The thermal stresses of the switching devices are analysed during low-voltage ride-through operation with different levels of reactive power injection, allowing an optimal design of the proposed control scheme with controlled mean junction temperature and reduced junction temperature swings. The effectiveness of the control method in terms of both thermal performance and electrical performance is validated by the simulations and experiments, respectively. Both test results show that single-phase PV inverters with the proposed control approach not only can support the grid voltage recovery in low-voltage ride-through operation but also can improve the overall reliability with a reduced junction temperature.
机译：预计未来的光伏（PV）逆变器将符合更严格的电网规范和可靠性要求，尤其是在达到高穿透度时，还可以降低能源成本。为了减少结温应力，从而提高光伏逆变器的可靠性，本研究针对单相光伏逆变器中的开关器件提出了结温控制概念。在低压穿越运行期间使用不同水平的无功功率注入来分析开关器件的热应力，从而可以在控制平均结温和降低结温波动的情况下对提出的控制方案进行最佳设计。仿真和实验分别验证了该控制方法在热性能和电性能方面的有效性。两项测试结果均表明，采用所提出的控制方法的单相光伏逆变器不仅可以支持低压穿越运行中的电网电压恢复，而且可以在降低结温的情况下提高整体可靠性。

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