Feedback-free node synchronization grid-connection control method and system for silicon carbide energy storage converter

Abstract

The present application relates to a silicon carbide energy storage converter feedback node synchronization parallel grid control method and system, comprising: when the voltage and frequency of the silicon carbide energy storage converter grid point grid side meet the synchronization parallel grid constraint, read the count of Adaptive-flag; when the count is 1, perform adaptive adjustment, when the count is 0, change the count of Adaptive-flag to 1 in the way of updating the given value of the output voltage of the silicon carbide energy storage converter and the given value of the frequency, and then perform adaptive adjustment, and give the synchronization parallel grid control result and the corresponding execution operation according to the adaptive adjustment result. The technical scheme of the present application is based on high sampling frequency and high control precision, and through real-time comparison of voltage fluctuation state before and after the silicon carbide energy storage converter grid point, the silicon carbide energy storage converter synchronization parallel grid in the condition of no feedback node can be completed without increasing auxiliary wiring or replacing the grid point switch, which greatly reduces the workload of field construction and modification, and further promotes the application of energy storage system in distribution network.

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