高郭冰　王蕾　刘洋　娄文静　徐兴东

摘要：为了降低风电并网对静态电压稳定性的影响，提出了采用网络拓扑优化（输电线路切换）的方法来提高含风电系统的静态电压稳定裕度。建立了以输电线路切换为控制措施的增强控制模型，该模型以最大化预测值确定的电力系统负荷裕度为目标函数，所有可能风电场出力场景对应的系统负荷裕度满足给定阈值要求，并且拓扑优化后的电力系统满足静态安全运行要求。针对大量风电出力场景引发的计算难题，提出了一种面向静态电压稳定问题的风电场景削减方法。为实现上述问题的快速求解以适应在线应用需求，提出了一种阶段式的有效切换线路识别方法。最后通过算例分析验证了所提出方法的有效性。结果表明，有效的输电线路切换能够提高含风电并网系统的静态电压稳定性。

关键词：线路切换;风电不确定性;场景削减;静态电压稳定性;负荷裕度

DOI：10.15938/j.jhust.2022.04.009

中图分类号： TM614

文献标志码： A

文章编号： 1007-2683（2022）04-0063-09

Static Voltage Stability Improvement of Wind Power System by Network Topology Optimization

GAO Guo-bing，WANG Lei，LIU Yang，LOU Wen-jing，XU Xing-dong

（School of Electrical and Electronic Engineering， Shandong University of Technology， Zibo 255000，China）

Abstract：To reduce the impact of wind power connection on static voltage stability， the network topology optimization （transmission line switching） is proposed to improve the static voltage stability margin of wind power system. The line switching model is presented to increase the load margins of power systems. The objective function is to maximize the load margin of the power system determined by the predicted wind output， as well as improving the load margins of all wind scenarios up to a given value， and the power system after topology optimization meets the safe operation requirements. Aiming at the computation problem caused by a large number of wind scenarios， a scenario reduction method tailored for static voltage stability problems is proposed. To solve the proposed problem for online applications， a stage-based effective line switching identification methodology is proposed. Finally， the numerical studies are carried out to verify the effectiveness of the proposed methodology. The results have shown that effective transmission line switching can improve the static voltage stability of wind power grid connected system.

Keywords：line switching; wind power uncertainty; scenarios reduction; static voltage stability; load margin

0引言

風力发电作为清洁无污染的可再生能源之一得到了迅速地发展。全国风电装机容量逐年增加，截止2020年上半年，全国新增风电并网容量6.32×10⁶kW，累计风电并网容量达到2.17×10⁸kW[1]。由于风能的固有属性，风力发电具有较强的随机性、波动性和相关性。大规模的风电接入会对电力系统静态电压稳定性产生较大影响，例如风电场出力不确定性引起的功率波动会导致电压波动和闪变[2];系统的电压稳定裕度随着风电渗透率的增加而下降[3]。……