1.合肥工业大学电气与自动化工程学院，安徽省 合肥市 230009;2.光伏系统教育部工程研究中心（合肥工业大学），安徽省 合肥市 230009
1.School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, China;2.Research Center for Photovoltaic System Engineering of Ministry of Education (Hefei University of Technology), Hefei 230009, China
This work is supported by National Natural Science Foundation of China (No. 51541703).
The system voltage of microgrid operating in the islanded mode is fully supported by the coordinated operation of all microgrid inverters in the network. Thus, the supply voltage quality of the microgrid is highly dependent on the control performance of microgrid inverters. Due to the existence of a large number of single-phase loads, the system load usually features unbalance, which is easy to cause system voltage unbalance. In view of this problem, aiming at controlling the unbalance degrees of voltages both at the inverter port and the point of common coupling (PCC), this paper proposes a compensation algorithm of negative voltage based on the particle swarm optimization (PSO) algorithm, which starts from the deep analysis of unbalance mechanism. The unbalance degrees of voltages at inverter port and PCC are taken as the constraint conditions to establish the objective function. At the same time, the circulating current problem between inverters is also taken into account. Consequently, the circulating current among microgrid inverters is suppressed while the voltage unbalance degree is controlled. Finally, based on MATLAB and a power electronic real-time simulation platform, the system simulation model and the semi-physical real-time simulation model are built. The simulation and experimental results verify the correctness and effectiveness of the proposed method.
LAI Jidong,XIE Tianyue,SU Jianhui,et al.Coordinated Control of Voltage Unbalance Compensation in Islanded Microgrid Based on Particle Swarm Optimization Algorithm[J/OL].Automation of Electric Power Systems,http://doi.org/10.7500/AEPS20200108004.