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 and Automation Engineering, 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
In the islanded microgrid, the microgrid inverter participates in the unbalance compensation of system voltage, which is one of the important ways to improve the power quality in the network. However, under the condition of serious load unbalance, it may occur that the unbalanced voltages at the inverter port and the point of common coupling (PCC) cannot be compensated simultaneously even if the microgrid inverter has a sufficient capacity. Therefore, on the basis of theoretical analysis of coordinated compensation mechanism for unbalanced voltage both at the microgrid inverter port and PCC, the influencing factors of coordinated compensation for unbalanced voltage are firstly discussed. And then the coordinated compensation boundary conditions are analyzed and deduced in detail. Consequently, a quantitative calculation method of unbalanced voltage compensation boundary is proposed. This method takes the voltage unbalance degrees of the microgrid inverter port and PCC as the constraint conditions to obtain the critical current value of coordinated compensation of microgrid inverter. Finally, a simulation platform and an experimental platform are established based on the MATLAB/Simulink and the Starsim hardware-in-the-loop simulation platform, respectively. The simulation and experimental results verify the correctness and effectiveness of theoretical analysis of coordinated compensation boundary and the proposed method.
LAI Jidong, XU Jiejie, SU Jianhui, et al. Analysis and Calculation of Coordinated Compensation Boundary for Unbalanced Voltage of Microgrid Inverter[J/OL]. Automation of Electric Power Systems, http://doi. org/10.7500/AEPS20210610009.