计及短路比约束的新能源场站布点及网架协调规划方法

Coordinated Planning Method for New Energy Station Siting and Network Considering Short Circuit Ratio Constraints

对于多直流馈入的高比例新能源受端电网,直流和新能源的动态响应特性耦合作用日益密切,新能源场站的配置与电网电压支撑强度有强相关性,系统安全稳定运行风险剧增。为此,提出一种综合考虑多直流馈入短路比和新能源多场站短路比的新能源场站布点及网架协调规划方法。首先,构建计及新能源出力不确定性和短路比指标的研究框架,利用K-means聚类筛选典型场景,类比直流短路比推导由不同因素引起的新能源多场站短路比变化的扩展表达式;进而,计及短路比约束构建新能源场站布点及网架协调规划的双层模型,基于Benders分解算法实现模型的迭代求解;最后,基于PSD-BPA平台在改进的IEEE-39节点系统进行仿真测试,结果表明所提方法能够同时满足多馈入直流短路比和新能源多场站短路比的强度要求,并在一定程度降低新能源场站脱网风险,提高受端电网的电压支撑强度。

For receiving-end power grids with high proportions of new energy stations,the dynamic response characteristics of direct current(DC)and new energy are increasingly interlinked.The configuration of new energy stations is closely related to the voltage support strength of the grid,raising the risks to the systems safe and stable operation.To address this issue,a novel method for the coordinated planning of new energy station siting and grid network is proposed,incorporating the multi-infeed short circuit ratio(MISCR)and multiple renewable energy station short circuit ratio(MRSCR).First,a research framework is developed that considers the uncertainty of new energy output and the short circuit ratio(SCR)index.The K-Means clustering method is used to identify typical scenarios.An expanded expression for MRSCR is derived by analogy to the MISCR derivation,accounting for variations due to different factors.A two-level model is then created for the coordinated planning of new energy stations and grid expansion,incorporating SCR constraints.The Benders decomposition algorithm is applied to iteratively solve the model.Simulations and tests are performed on a modified IEEE-39 bus system using the PSD-BPA platform.The results show that the proposed method simultaneously meets the requirements for both MISCR and MRSCR,reduces the risks associated with new energy stations disconnecting from the grid,and moderately enhances the voltage support strength of the receiving-end power grid.