Equivalent circuit-based micro-grid low-frequency oscillation generation mechanism damping analysis method

The invention discloses a micro-grid low-frequency oscillation generation mechanism damping analysis method based on an equivalent circuit. The method comprises the following steps: (1) determining a control strategy of an inverter in a micro-grid; (2) modeling an equivalent circuit of the PI controller; (3) equivalent circuit modeling of voltage and current double-closed-loop control; (4) modeling an equivalent circuit of droop power control; (5) mathematical modeling of an overall equivalent circuit of the droop control inverter; (6) analyzing a low-frequency oscillation mechanism; (7) judging and verifying an oscillation mechanism; the physical significance of each part of the system can be visually and clearly reflected, and the low-frequency oscillation can be analyzed from the mathematical perspective to determine the internal generation mechanism of the low-frequency oscillation. 本发明公开了基于等效电路的微电网低频振荡产生机理阻尼分析方法，(1)确定微电网中逆变器的控制策略；(2)PI控制器的等效电路建模；(3)电压电流双闭环控制的等效电路建模；(4)下垂功率控制的等效电路建模；(5)下垂控制逆变器整体等效电路的数学建模；