计及配网电压越限的光储协同优化运行策略  

Optimal operation strategy of distributed photovoltaic and energy storage systems by considering voltage violations in the distribution network

作　　者：顾怡 邢洁 马洪艳 高杉 GU Yi;XING Jie;MA Hongyan;GAO Shan(College of Information Science and Technology,Donghua University,Shanghai 201620,China)

机构地区：[1]东华大学信息科学与技术学院,上海201620

出　　处：《储能科学与技术》2024年第3期893-902,共10页Energy Storage Science and Technology

基　　金：国家自然科学基金(52207079);上海市青年科技英才扬帆计划(21YF1400200)。

摘　　要：随着大量分布式光伏(distributed photovoltaic,DPV)并网,目前配电网中出现了日间过压和夜间低压并存的电压越限问题,并进一步影响了网络的经济运行。本工作基于此提出了两阶段光储系统协同运行的优化调度策略。该策略第一阶段通过计算节点的电压灵敏度来确定待调节的储能节点与充放功率,以及光伏可调节点;第二阶段建立了光储运行优化模型。该模型以储能的调度成本、购售电成本以及网损成本之和最小为目标,以网络潮流、节点电压、储能SOC(state of charge)、光伏的无功可调容量等作为约束,通过粒子群算法对该模型进行求解,可以得到光储系统日调度出力策略。最后,以某地区31节点的实际配电网作为算例,验证了本工作方法的有效性。算例结果表明,该策略可以通过光储的协同调度,有效治理电网中的电压越限问题,并且在保障配电网电压安全的同时,实现优化运行成本的目标。Although distributed photovoltaics(DPVs)are increasingly being integrated into power grids,the problems of daytime overvoltage and nighttime low voltage in the distribution the network persist,which affect network economy.To overcome this problem,a two-stage optimization operation strategy involving DPVs and energy storage systems(ESSs)was proposed.In the first stage of the strategy,the position and amount of charge and discharge of the ESSs were determined by calculating the voltage sensitivity of the node and the adjustable photovoltaic reactive power node.Next,the optimization operation model was established.The model minimizes the sum of dispatching cost of ESSs,power exchange cost,and network loss cost.The constraints of the study include the distribution network,node voltage,state of charge(SOC)of ESSs,and adjustable reactive power capacity of photovoltaic inverters.In this model,particle swarm optimization was used to devise the daily scheduling output strategy of DPVs and ESSs.Finally,the effectiveness of the proposed method was verified using a 31-node actual distribution network.The simulation results revealed that the proposed strategy can effectively solve the voltage violation problem through the cooperative dispatching of DPVs and ESSs.Thus,the operating cost of the distribution network can be optimized while ensuring voltage safety.

关 键 词：分布式光伏 电压越限 储能装置 光伏无功 运行优化 

分 类 号：TM732[电气工程—电力系统及自动化]