计及控制方式的孤岛微网供电可靠性评估

摘要

Power supply reliability indices of islanded micro-grids indicate the ability of providing continuous power sup-ply for the user.When reliability indices are known,the re-liability of islanded microgrid can be assessed.In order to analyze the influence of different control modes on the reli-ability,three kinds of control modes are made.And the time series model of wind-solar power and the two pool model (Kinetic Battery Model,KiBaM)of battery are es-tablished.The effect of component failure on the operation state of a microgrid and the load shedding method based on the location and the importance are analyzed.The sequen-tial Monte Carlo simulation method is used to sample the state of components,and then to determine fault compo-nent.By comprehensively considering such factors as the stochastic output characteristic of power,control methods, the component failure,the load shedding method and the grid structure,a power supply reliability evaluation algorithm of islanded microgrid is proposed.In the end,taking a micro-grid with simple structure as an example,the power supply relia-bility evaluation is carried out,and the correctness of the pro-posed algorithm is verified by example results.%孤岛微网供电可靠性指标表征微网向用户提供持续供电的能力,掌握可靠性指标就可以对孤岛微网进行可靠性评价.为了分析不同控制方式对可靠性的影响,制定了3种控制方式;建立了风光功率时序模型和蓄电池两池模型(Kinetic Battery Model,KiBaM);分析了元件故障对微网运行状态的影响和基于位置及重要程度的负荷削减方法;采用序贯蒙特卡洛模拟方法抽样元件状态,确定故障元件;综合考虑电源出力的随机性、 控制方式、 元件故障、 负荷削减方法和网架结构,提出了孤岛微网供电可靠性评估算法.最后,以一网架结构简单的微网为例,对其进行供电可靠性评估,算例结果证明了所提出算法的正确性.