标题:
微电网孤岛运行故障分析Fault Analysis of Isolated Island Operation of Micro-Grid
作者:
蒋骏杰, 居荣
关键字:
微电网, PQ控制策略, VF控制策略, 等值模型, 数值分析Micro-Grid, PQ Control Strategy, VF Control Strategy, Equivalent Model, Mathematical Analysis
期刊名称:
《Journal of Electrical Engineering》, Vol.4 No.1, 2016-03-08
摘要:
微电网系统是分布式发电系统的新发展方向。本文针对微电网故障问题，首先分析了PQ与VF控制逆变器的运行特点，建立了基于逆变器控制策略的数学模型，并且推导了故障临界条件。结合微电网并网以及孤岛运行时的工作特点，利用故障时的节点电压与电流，推导出了微电网在故障运行时候的电压与电流求解方程，并以此建立了故障分析方法。最后利用PSCAD建立了380 V低压电力系统孤岛运行的仿真系统，验证了所述方法的正确性。
Micro-grid system is a new development direction of distributed generation system. In this paper, the operation characteristics of PQ and VF control inverter are analyzed, the mathematical model is established based on the control strategy of inverter, and the critical condition of the fault is derived. According to the working characteristics of the micro-grid in grid connected operation and islanded operation, by using the node voltages and currents in fault condition, micro-grid voltage and current equations in the run time are derived, and the fault analysis method is established. At last, by using the PSCAD, a simulation system of isolated island operation of low voltage of 380 V is built, testing the validity of the proposed method.