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arXiv 2012.02880eess.SPcs.LG
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联合配电系统状态估计的分层深度Actor-Critical学习方法

A Hierarchical Deep Actor-Critic Learning Method for Joint Distribution System State Estimation

Iowa State University(爱荷华州立大学)

Yuxuan Yuan, Kaveh Dehghanpour, Zhaoyu Wang, Fankun Bu

摘要:

由于不稳定的分布式光伏(PV)资源的渗透率越来越高,在电网边缘对客户进行实时监控已成为一项关键任务。然而,这需要解决的配电系统状态估计(DSSE)联合为初级和次级的配电网,这是计算复杂,缺乏可扩展性的大型系统。为了实现DSSE的近实时求解,我们提出了一种新的分层强化学习辅助框架:在第一层,加权最小二乘(WLS)算法求解主中压馈线上的DSSE;在第二层,使用测量残差为每个次级Transformer训练深度行动者-批评者(A-C)模块,以估计低-电压电路,并捕获PV在网格边缘的影响。虽然交流参数学习过程离线进行,但经过训练的交流模块会在线部署,以进行快速二次电网状态估计;这是该框架可扩展性和计算效率的关键因素。为了保持监测精度,两个级别在次级节点处彼此交换边界信息,包括Transformer电压(第一层到第二层)和有功/无功总功率注入(第二层到第一层)。这种交互式的信息传递策略导致了一个闭环结构,该结构能够在几次迭代中跟踪两层的最优解。此外,我们的模型可以处理的拓扑结构的变化,使用的雅可比矩阵的第一层。我们已经进行了数值实验,使用真实的公用事业数据和馈线模型,以验证所提出的框架的性能。

英文摘要:

Due to increasing penetration of volatile distributed photovoltaic (PV) resources, real-time monitoring of customers at the grid-edge has become a critical task. However, this requires solving the distribution system state estimation (DSSE) jointly for both primary and secondary levels of distribution grids, which is computationally complex and lacks scalability to large systems. To achieve near real-time solutions for DSSE, we present a novel hierarchical reinforcement learning-aided framework: at the first layer, a weighted least squares (WLS) algorithm solves the DSSE over primary medium-voltage feeders; at the second layer, deep actor-critic (A-C) modules are trained for each secondary transformer using measurement residuals to estimate the states of low-voltage circuits and capture the impact of PVs at the grid-edge. While the A-C parameter learning process takes place offline, the trained A-C modules are deployed online for fast secondary grid state estimation; this is the key factor in scalability and computational efficiency of the framework. To maintain monitoring accuracy, the two levels exchange boundary information with each other at the secondary nodes, including transformer voltages (first layer to second layer) and active/reactive total power injection (second layer to first layer). This interactive information passing strategy results in a closed-loop structure that is able to track optimal solutions at both layers in few iterations. Moreover, our model can handle the topology changes using the Jacobian matrices of the first layer. We have performed numerical experiments using real utility data and feeder models to verify the performance of the proposed framework.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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