Power zero-awareness switching method and system based on phase real-time tracking

Abstract

The present application relates to the field of electric power technology, specifically to a power zero-aware switching method and system based on phase real-time tracking, comprising the following steps: collecting the communication connection state of each inverter node in the micro-grid group, constructing the communication topology model of the micro-grid group, analyzing the sparse communication connection relationship between each node in the communication topology model, and generating a Laplace matrix reflecting the node connectivity according to the sparse communication connection relationship. The present application can comprehensively evaluate the system state from two dimensions of external alignment accuracy and internal stability, avoiding misjudgment caused by a single indicator. The double error is input into the switching stability evaluation model to calculate the stability index, and the switching instruction is generated only when the index exceeds the grid-connected permission threshold, realizing the quantitative decision and strict control of the grid-connected opportunity, ensuring that the micro-grid and the main grid are highly synchronized in phase and frequency at the moment of circuit breaker closing, and eliminating the transient impact and circulating current at the moment of closing.

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