Study on Control Scheme for the Inverters in Low Voltage Microgrid with Nonlinear Loads

2017 2nd Asia Conference on Power and Electrical Engineering

能源学;电工学

Xu, Jiqiang^1 ; Lu, Wenzhou^1 ; Wu, Lei^1

Key Laboratory of Advanced Process Control for Light Industry, Ministry of Education, Jiangnan University, Wuxi

214122, China^1

关键词: Constant power;    Control methods;    Control schemes;    Grid-connected modes;    Low voltage microgrid;    Output voltages;    Smoothly switches;    Stationary reference frames;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/199/1/012090/pdf
DOI  :  10.1088/1757-899X/199/1/012090

来源: IOP

【 摘 要 】

There are a lot of nonlinear loads in real low voltage microgrid system. It will cause serious output voltage and grid current harmonic distortions problems in island and grid-connected modes, respectively. To solve this problem, this paper proposes a droop control scheme with quasi-proportion and resonant (quasi-PR) controller based on αβ stationary reference frame to make microgrid smoothly switch between grid-connected and island modes without changing control method. Moreover, in island mode, not only stable output voltage and frequency, but also reduced output voltage harmonics with added nonlinear loads can be achieved; In grid-connected mode, not only constant power, but also reduced grid current harmonics can be achieved. Simulation results verify the effectiveness of the proposed control scheme.