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A System-guidance for Power Router Applications in DC Buildings

With the global interest in carbon neutrality, the renewable energy generation (REG) industry has developed rapidly in the past few decades. In order to improve the integration efficiency of REG like the photovoltaic (PV) arrays, the direct current (DC) power system is re-adopted after almost 100 years. With more and more demonstrations or business systems under operation, the practical applications on the DC microgrids and the DC transportation systems have proven the feasibility of DC buildings. In DC buildings, power routers are used to regulate the power flow among the power electronic interfaces. However, the existing standards and codes are focused on the high voltage level and extra low voltage level application, the implementation and the operation standard of the power routers in the DC building application have not received too much attention. In this paper, system-level guidance for power router applications in DC buildings is proposed. By the modification of the existing standards and the analysis of the DC building operation, the sizing guidance is proposed to satisfy any possible circumstances. Control recommendations are also provided to match the microgrid standards, including voltage control, power dispatch, and low voltage ride-through.