基于改进GRA的AC/DC配电系统自治运行能力评估

Evaluation of Autonomous Operation Capability of AC/DC Distribution System Based on Improved GRA

交直流(AC/DC)配电系统具有交直流负荷高效供电、互动支撑、供电灵活等特点,使其成为未来配电网发展的必然趋势之一。AC/DC配电系统在电网紧急情况下可脱网自治运行,进一步提升配电网的供电可靠性,因此有必要对其自治运行能力进行评估分析。本文提出一种基于改进灰色关联度分析(gray relation analysis,GRA)的评估方法,用来评估AC/DC配电系统的自治运行能力。首先从多角度分析了影响AC/DC配电系统自治运行能力的关键因素;接着,从发电侧、网架侧、负荷侧和储能侧4个方面进行分析,建立了AC/DC配电系统自治运行能力综合评价指标体系;最后,利用基于熵值法的改进GRA方法对电网数据进行量化评估。仿真结果验证了本文提出的评估方法的有效性和客观性。

AC/DC power distribution system has the characteristics of high efficiency power supply,interactive support and flexible power supply for ac/dc load.Moreover,AC/DC distribution system can run autonomally off the grid in an emergency to further improve the power supply reliability of the distribution network.Therefore,it is necessary to evaluate and analyze its autonomic operation capability.An evaluation method based on improved grey relational degree analysis is proposed to evaluate the autonomic operation capability of AC/DC distribution system.The contributions of this paper are that:1)analyzing the key factors affecting the autonomous operation capability of AC/DC distribution system;2)establishing a comprehensive evaluation index system from generation side,grid side,load side and storage side;and 3)using an improved GRA based on entropy method to achieve quantitative assessment.Simulation results are presented and compared to verify the effectiveness of the evaluation method.