考虑需求响应的有源配电系统可靠性评估

提出一种考虑需求响应(demand response,DR)的配电系统可靠性评估算法。首先采用改进隶属度函数进行峰谷时段划分,并建立综合分时电价和激励机制的用户响应模型。为提高可靠性评估效率,提出基于阈值和最小距离的聚类方法产生年负荷的多状态模型。计及风力发电机出力的相关性,利用秩相关系数、拉丁超立方抽样和Cholesky分解获取风机输出功率的相关性样本。在此基础上,通过修正孤岛稳定运行概率对传统可靠性指标的影响,可实现考虑负荷响应的有源配电网可靠性分析。应用所述的方法对算例进行可靠性评估,结果表明需求响应策略能改善电网可靠性和提高电能利用率。

An Active Distribution System Reliability Evaluation Method Considering Demand Response

This paper proposes a new reliability evaluation method for distribution system considering demand response. Firstly, we divided the peak-valley periods based on improved membership function and established a customer response model integrating time-of-use price and incentives. To improve the reliability assessment efficiency, a clustering method based on threshold and minimum distance was proposed to generate annual load multi-state model. We applied the correlation coefficient matrix, Latin hypercube sampling and Cholesky decomposition to get the correlation sample of wind turbine generator output. Finally, the reliability analysis of active distribution network considering demand response can be realized by correcting the traditional reliability index based on island stable operation probability. Applying the proposed method to the reliability evaluation of example, the results show that the demand response strategy can improve the reliability and energy efficiency of grid.