面向高比例分布式能源接入的输配网两阶段风险调度研究

Research on Two--Stage Risk Scheduling for Transmission and Distribution Power Grids with High Proportion of Distributed Energy Access

随着大量高比例可再生能源接入配电网,潮流呈现双向化,输电网和配电网互联性增加,分散独立的调度影响电网可靠稳定运行水平。面对输网与配网间互济需求增强的现状,提出了面向高比例分布式能源接入的输配电网两阶段风险调度研究。首先以最小运行成本为目标,构建考虑输配电网不同运行风险的日前经济调度模型,在风险限值约束情况下协同优化系统源网荷储多种可调资源;其次构建目标函数为综合风险值最小的日内风险调度模型,计算三类运行风险指标值,对日前可调控资源进行出力计划调整;最后通过改进的粒子群算例求解模型,证明了该模型可使输配电网间交互协调,协同优化运行成本与运行风险,验证了所提两阶段风险调度模型的有效性和优越性。

With the integration of a large proportion of renewable energy into the distribution network,the power flow turns bidirectional,and the interconnection between the transmission and distribution networks increases while the decentralized and independent power dispatch affects the reliable and stable operation of the grid.This paper presents a study on the two-stage risk dispatch for transmission and distribution networks that have a high proportion of distributed energy access to meet the rising demand for coupling between the two types of networks.Firstly,with the goal of minimizing operating costs,a day-ahead economic dispatch model considering different operational risks of the transmission and distribution grid is constructed,and under risk limit constraints,multiple adjustable resources from the system source,network,load,and storage are synergistically optimized;Secondly,an intraday risk scheduling model is constructed with the objective function of minimizing the comprehensive risk value,and the values of the three operational risk indicators are calculated and adjustments made to the output plan of the adjustable resources accordingly.Finally,the proposed two-stage risk scheduling model is solved using an enhanced particle swarm algorithm to verify its effectiveness and superiority,and it is proved that the model can enable interaction and coordination between transmission and distribution networks,synergistically optimize operating costs and risks,thus verifying the effectiveness and superiority of the proposed model.