考虑电网元件类型全面性的等值方法研究

Research on the Equivalence Method Based on the Comprehensiveness of Element Types in Power Systems

提出一种基于元件类型全面性的电网静态等值方法,以系统等值前后的高斯消元结果、潮流状态信息不变为前提,保留外网支路、发电机、负荷和对地支路4种元件类型,推导出等值网络中的各等值参数。所提方法不仅保证了电力系统等值前后潮流状态信息不变,还保证了电力系统等值元件类型的全面性。相较于已有的电力系统简单挂等值机、戴维南等值方法,在IEEE 39节点系统中进一步验证了所提方法在电力系统静态安全分析的正确性及有效性,该方法能获得更高的外网等值精度。

In this paper,a static equivalence method based on the completeness of equivalent element types in power systems is proposed.On the premise that the Gaussian elimination results before and after system equivalence and the information of power flow state are not changed,four types of element types of external network branch,generator,load and ground branch are retained,and the equivalent parameters in equivalent networks are derived.This method not only guarantees the invariable information of power flow state before and after power system equivalence,but also guarantees the comprehensiveness of power system equivalence component types.Compared with the existing methods which simply rely on equal check-in and Davinen equivalence method,the proposed method can obtain higher external network equivalent accuracy.The static security analysis results of an IEEE 39-node power system further verify the correctness and effectiveness of the proposed method.