基于状态势博弈的配电网分布式电压调节方法

A state-based potential game approach for distributed voltageregulation in distribution networks

近年来,随着可再生能源渗透率的逐步提高,由可再生能源出力固有的间歇性导致的电压波动和电压越限给配电网的安全稳定运行带来了严峻的挑战。针对该问题,文中将配电网中的电压调节问题建模为状态势博弈模型,并设计相应的分布式算法进行求解。首先,对辐射状配电网潮流模型进行线性化,基于线性潮流模型提出以系统电压分布偏差和无功出力成本之和为目标函数的配电网电压调节方法。然后,基于状态势博弈理论,根据仅需本地及邻居节点信息即可求解的原则设计各节点的子问题,并完成分布式电压调节算法的设计。进一步地,在每次迭代中,以冻结当前孤立节点状态的方式对所设计的算法进行改进,增强算法在通信链路随机故障下的韧性。仿真结果表明:即使存在通信链路随机故障,文中所设计的分布式电压调节算法仍可在保护分布式机组隐私的前提下实现配电网电压分布的快速有效调节。同时,与其他分布式电压调节算法相比,文中算法具有更快的收敛速度和更好的电压调节效果。

With the increasing penetration rate of renewable energy sources over recent years,voltage fluctuations and violations due to the inherent intermittency of renewable energy sources pose a great challenge to the safe and steady operation of distribution networks.To tackle this problem,the voltage regulation problem in distribution networks is formulated as a state-based potential game and then solved in a distributed manner in this paper.Specifically,the power flow model of radial distribution networks is linearized at first.Then,based on the linearized power flow model,a voltage regulation problem in distribution networks is modeled,whose objective function is the sum of voltage profile deviations and reactive power generation costs.Next,the subproblems for each bus is designed based on the state-based potential game theory,in the solving of which only its local and neighbor information are required,facilitating the design of the distributed voltage regulation algorithm.Further,the proposed algorithm is improved by freezing the states of isolated buses during each iteration,increasing its resilience against random link failures.Simulation results show that the proposed distributed voltage regulation algorithm can achieve fast and effective voltage profile regulation in distribution networks while preserving the privacy of distributed generators,even in the presence of random communication link failures.In addition,compared to other distributed voltage regulation algorithms,the proposed algorithm exhibits a faster convergence rate and better voltage regulation performance.