考虑FID综合损耗的柔性互联配电网检修日经济运行优化策略

Optimal strategy of economic operation for flexible interconnected distribution network in maintenance day considering FID comprehensive loss

针对负载均衡策略未考虑柔性互联装置(FID)的综合损耗对经济运行的影响,且未涉及检修日经济运行方式优化的问题。首先基于仿真采用最小二乘估计法建立换流阀和换流变压器的损耗率模型,以及换流阀的损伤系数模型。其次结合示范工程中的三端柔性互联配电网拓扑结构,根据直流断路器(DCCB)运行状态对系统运行方式进行划分。然后建立检修日两阶段经济运行优化模型,第一阶段以各时段损耗成本最小为目标建立经济时序优化模型;第二阶段以DCCB检修日全天损耗成本最小为目标建立检修日运行方式优化模型。分别采用改进线性递减策略-粒子群优化法(LDW-PSO)和隐枚举法对两阶段模型进行求解。最后算例结果表明该优化策略可快速、准确计算系统时序损耗成本,并有效降低检修日内损耗成本,可为检修提供经济指导。

Aiming at the problem that the load balancing strategy does not consider the impact of the FID(Flexible Interconnection Device)comprehensive loss on economic operation,and does not involve the optimal problem of economic operation mode in maintenance day.Firstly,based on the simulation,the LES(Least Square Estimation method)is used to establish the loss rate model of converter valve and converter transformer,and the damage coefficient model of converter valve.Secondly,combined with the topology of threeterminal flexible interconnected distribution network in the demonstration project,the system operation modes are divided according to the operation state of DCCB(DC Circuit Breaker).Then,the two-stage economic operation optimal model in maintenance day is established.In the first stage,the economic time series optimal model is established with the objective of minimizing the loss cost of each period.In the second stage,the optimal model of operation mode in maintenance day is established with the objective of minimizing the loss cost of DCCB maintenance day.The improved LDW-PSO(Linear Descend Weight-Particle Swarm Optimal method)and IEM(Implicit Enumeration Method)are used to solve the two-stage model.Finally,the example results show that the optimal strategy can quickly and accurately calculate the system time series loss cost,effectively reduce the loss cost in maintenance day and provide economic guidance for maintenance.