Research on switching method of low inertia microgrid parallel transformer

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The vigorous development of clean energy technology has gradually led to the formation of a new power system. The new power system takes clean energy as the main supply, and has the advantages of clean, low-carbon, flexible and efficient. However, it has low inertia and is easily affected by energy fluctuation, resulting in protection misoperation. Microgrid has small volume and poor anti-interference ability. The magnetizing inrush current generated by parallel transformer during switching is very easy to lead to misoperation of transformer protection, which threatens the stability and safety of the whole power grid. Therefore, are switching method of parallel transformer is proposed. First, close all secondary circuit breakers, and then select the primary circuit breaker of one transformer for initial closing. After the closing is completed, conduct the closing operation again after the delay and phase angle determination. The two switching operations are completed, and the no-load closing operation is completed. Finally, the PSCAD simulation model is established to simulate the AC microgrid to verify the feasibility of this method.