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Electro-thermal analysis of power converter components in low-voltage DC microgrids for optimal protection system design

机译：低压直流微电网中功率转换器组件的电热分析，以优化保护系统设计

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Bidirectional power converters are considered to be key elements in interfacing the low voltage dc microgrid with an ac grid. However to date there has been no clear procedure to determine the maximum permissible fault isolation periods of the power converter components against the dc faults. To tackle this problem, this paper presents an electro-thermal analysis of the main elements of a converter: ac inductors, dc capacitors and semiconductors. In doing this, the paper provides a methodology for quantifying fault protection requirements for power converter components in future dc microgrids. The analysis is performed through simulations during normal and fault conditions of a low voltage dc microgrid. The paper develops dynamic electro-thermal models of components based on the design and detailed specification from manufacturer datasheets. The simulations show the impact of different protection system operating speeds on the required converter rating for the studied conditions. This is then translated into actual cost of converter equipment. In this manner, the results can be used to determine the required fault protection operating requirements, coordinated with cost penalties for uprating the converter components.
机译：双向功率转换器被认为是使低压直流微电网与交流电网连接的关键要素。但是，迄今为止，尚没有明确的程序来确定功率转换器组件针对直流故障的最大允许故障隔离时间。为了解决这个问题，本文介绍了转换器主要元件的电热分析：交流电感器，直流电容器和半导体。为此，本文提供了一种用于量化未来直流微电网中功率转换器组件的故障保护要求的方法。通过在低压直流微电网的正常和故障情况下的仿真来执行分析。本文根据制造商数据表的设计和详细规范，开发了组件的动态电热模型。仿真结果表明，在研究条件下，不同保护系统运行速度对所需变频器额定值的影响。然后将其转换为转换器设备的实际成本。以这种方式，结果可以用于确定所需的故障保护操作要求，并与升级转换器组件的成本损失相协调。

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