Grid-connected Control of Distributed Generation Inverter Based on Angle Droop Control
Frequency droop control is a common control method for the microgrid off-grid operation,but there are problems such as frequency deviation.The angle droop control based on the fixed frequency has many advantages,but how to use it under the grid-connected conditions has scarcely been studied.This paper proposes a grid-connected control method for distributed generation inverters based on the angle droop control for microgrid operation.Two controllers,the proportional controller and the proportional integral controller,are designed to compensate for the synchronous phase.In addition,a switching method of the microgrid grid-connected control to the off-grid control under the angle droop control is proposed.Furthermore,the small signal dynamic model of the microgrid under the proposed grid-connected control is established,and the grid-connected control parameters are optimized by the particle swarm optimization.Finally,the effectiveness of the proposed method is verified by the time domain simulation based on the Simulink platform and the hardware-in-the-loop experiment based on the RT-Lab semi-physical platform.
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