考虑风电出力不确定性的电网无功-电压控制鲁棒分区方法  

Robust Var-voltage Control Partitioning for Power Grid Considering Wind Power Uncertainty

作　　者：彭啸宇 沈怡 陆秋瑜 沈沉[1] PENG Xiaoyu;SHEN Yi;LU Qiuyu;SHEN Chen(Department of Electrical Engineering,Tsinghua University,Haidian District,Beijing 100084,China;Electric Power Dispatching and Control Center of Guangdong Power Grid Co.,Ltd.,Guangzhou 510000,Guangdong Province,China)

机构地区：[1]清华大学电机工程与应用电子技术系,北京市海淀区100084 [2]广东电网有限责任公司电力调度控制中心,广东省广州市510000

出　　处：《电网技术》2023年第10期4102-4110,共9页Power System Technology

基　　金：南方电网公司科技项目([03600KK522-00049(GDKJXM20201978)])。

摘　　要：基于无功就地平衡的原则对电网分区,是电力系统无功电压分层分区控制的关键。目前,随着风电等出力具有较强随机性和波动性的可再生能源发电渗透率大幅增长,系统运行状态发生较大变化的可能性大幅增加。新能源出力的大幅波动可能造成系统潮流的大范围变化。现有无功电压控制分区方法依赖潮流信息,当潮流发生较大变化时,分区结果也会发生较大变化,进而影响无功电压控制效果。提出一种适应频繁多变潮流的无功-电压控制鲁棒分区方法。首先,利用高斯混合模型刻画了风机出力随机特性,进而基于线性潮流推导网络节点电压的概率分布;然后,以Wasserstein距离为基础,从节点电压相关性角度出发,在统计意义上定义了节点间的电气距离;最后,以社团理论中的模块度指标最优为目标实现区域的划分。基于新英格兰39节点系统的仿真算例表明,该方法在保持分区鲁棒性的同时,能够较好地实现区域间电压控制解耦。The partitioning of power grids based on reactive power local balance is crucial for the hierarchical control of voltage in power systems.However,with the significant increase in the penetration rate of renewable energy sources such as wind power,which exhibit strong randomness and volatility,the likelihood of substantial changes in the system operating state has greatly increased.The large fluctuations in renewable energy resources can lead to variations in power flow.Existing partitioning methods rely on power flow information.Therefore,their results can undergo substantial changes when there are significant changes in power flow,thereby affecting the effectiveness of reactive voltage control.This paper proposes a robust partitioning method that can adapt to frequent and variable power flow fluctuations.Firstly,the stochastic characteristics of wind power output are characterized using a Gaussian mixture model,and the probability distribution of voltages is derived based on linear power flow.Next,by employing the Wasserstein distance as a foundation,the electrical distance between buses is statistically defined from the perspective of voltage correlation.Finally,the optimal partitioning of areas is achieved by maximizing the modularity index,which is derived from community theory.Simulation results on the IEEE 39-bus system demonstrate that this method maintains robust partitioning while achieving effective decoupling of voltage control among different areas.

关 键 词：电压控制分区 高斯混合模型 电气距离 复杂网络理论 模块度指标 

分 类 号：TM721[电气工程—电力系统及自动化]