最优孤岛划分下含分布式电源配电网可靠性评估

随着智能电网的建设,大量分布式电源引入配电网后,配电网的供电情况发生了很大的变化,对其故障自愈策略也越来越重视。本文在计及风、光伏发电和负荷功率的随机性的基础上,建立最优孤岛划分模型,找出配电网各负荷点的可靠性指标的计算方法,并使用蒙特卡洛对配电网可靠性进行求解。最后通过对IEEE-RBTS BUS 6系统进行分析,验证对含DG配电网采用最优孤岛划分的意义和其对系统可靠性评估的影响。本文从供电可靠性的角度,对含DG配电网的孤岛划分进行分析,为全面地评估含DG配电网供电可靠性和配电网故障自愈策略的制定提供了一定的理论依据。

Reliability Evaluation on Distribution Network with Distributed Generations Under Optimal Island Operation

With the development of smart grid, a large number of distributed generations are connected to distribution network, which cause great changes in the power supply situation of distribution network, so the fault self-healing strategy is becoming more and more important. Based on the randomness characteristics of the load power, and wind and photovoltaic power generation, the optimal island partitioning model is built. In addition, the calculation method of reliability index on each load bus in distribution network is proposed, and the Monte Carlo method is used to solve the reliability index of distribution network. In the end, through analyzing the IEEE-RBTS BUS 6 system, the validity of the application of optimal island partitioning method to distribution network with DGs and its impact on reliability evaluation of distribution network are studied. In this paper, from the aspect of the power supply reliability, the island partitioning of distribution network with DGs is evaluated quantitatively, which provides certain theoretical basis for evaluating the power supply reliability of distribution network with DG and determining relative fault self-healing strategy.