智能配电网状态估计方法研究现状分析

Research situation analysis of state estimation in smart distribution networks

状态估计对智能电网的安全稳定运行起着非常重要的作用,输电网成熟的状态估计方法无法直接应用于配电网,因此配电网状态估计方法的研究仍处于初步阶段。通过分析和总结智能配电网状态估计方法的研究现状,为智能配电网状态估计技术的发展提供指导。首先,论述配电网状态估计的几种常用算法,包含静态、动态状态估计算法,并介绍几种改进的状态估计算法;其次,采用主要的算法对四节点系统进行建模仿真。仿真结果表明,改进算法估计精度高、使用内存小、计算速度快,估计结果可信度高,具有很好的实用价值。最后,对智能配电网状态估计下一步研究方向进行展望。

State estimation plays an important role in the safe and stable operation of smart grid. However, this technology is still at the preliminary stage in the field of distribution networks. This paper makes an analysis and summary of research status for state estimation methods in intelligent distribution networks, and discusses the common algorithms and the improved algorithms for state estimation of distribution network. It provides important guidelines for the development of state estimation technical in intelligent distribution networks. Besides, a 4-node system is modeled and simulated by employing several dominant state estimation algorithms. It is shown that the improved algorithm has high estimation accuracy, small memory usage, fast calculation speed, and high reliability of estimation results. Finally, The next research direction of state estimation for intelligent distribution network is prospected.