基于实际电路理论分析的多负序源责任分摊

Responsibility Allocation of Multiple Negative Sequence Sources Based on Theoretical Analysis of Actual Circuits

摘要:

对负序源辨识研究不仅要找到主导源，更重要的是要定量各不平衡用户的责任。现有负序源识别的研究很大程度依赖于等效负序阻抗，而由于电力系统的波动性较大，负序阻抗参数的确定是难以解决的问题。文中的方法避开了估算负序等效阻抗这个难题，基于建立等效电路并结合实际情况分析的负序电流在系统中散布的原理，将实测数据作为基础参考数据，减少人为估算参数的干扰，确保计算数据的实时性和准确性，能够快速简单地得到各个负序源的责任划分量化指标并进行对比。最后，采用Matlab仿真模型和实际算例分析验证了所提方法的正确性。

Abstract:

The research on the identification of negative sequence sources is not only to find the dominant source, but also to quantify the responsibilities of each unbalanced user. The existing researches on the identification of negative sequence sources depend largely on the equivalent negative sequence impedance, and due to the large fluctuation of power system, the determination of negative sequence impedance parameters is difficultly to be solved. The proposed method avoids the problem of estimating the equivalent negative sequence impedance, and based on the established equivalent circuit and the principle of the distribution of negative sequence current in system analyzed by the combination with the actual situation, the measured parameters are taken as the foundation data to reduce the human interference in parameter estimation and to ensure the realtime performance and accuracy of calculation data. Thus the quantitative indicators of responsibility division of each negative sequence source can be quickly and easily obtained and compared. Finally, Matlab simulation model and actual calculation are adapted to verify the validity of the proposed method.