摘要
为了满足大规模风电并网下对地区电网进行详细仿真的需求,提出了一种适用于风电并网的地区电网等值方法。与聚焦于主网的传统动态等值不同,风电富集地区电网等值不仅要考察风电在地区电网中密集接入的特点,圈定各个风电场站影响范围,而且还要在边界节点上综合考虑外网的源、荷特性约束。所提方法可在保持稳态、暂态特性一致的前提下对外网进行大规模化简,实现地区电网的等值建模。首先,突破在风电场站接入点仅以短路比等电气强度指标来等效电网的传统方案,提出以节点残压来界定待研究区域与待等值外部区域;其次,考虑地区电网的拓扑约束对地区电网进行进一步化简;再次,考虑在边界节点上以等值同步发电机与复合负荷的组合形式构建外部系统的等值模型;最后,利用所提方法对实际风电富集地区电网进行了验证。仿真结果表明了所提等值方法的有效性。
In order to meet the detailed simulation requirements for large-scale wind power integration into regional power grid,an equivalence method applicable to regional power grid integration with wind power is proposed.Unlike traditional dynamic equivalence methods that focus on the main grid,the equivalence of regional power grid with enriching wind power resources must not only examine the characteristics of intensive wind power integration within the regional power grid,delineate the influence scope of each wind farm,but also comprehensively consider the constraints on the source and load characteristics of the external grid at the boundary nodes.The proposed method can simplify the external grid on a large scale while maintaining consistent steady-state and transient characteristics,achieving equivalent modeling of the regional power grid.Firstly,rather than the traditional scheme of equat⁃ing the grid at the access point of wind farms using short-circuit ratio and other electrical strength indexes,it is proposed to define the study area and the external area to be equated by residual voltage.Then,the regional power grid is further simplified by considering topological constraints of the regional power grid.Additionally,the equivalent model of the external system is constructed by combin⁃ing an equivalent synchronous generator and composite load at the boundary node.Finally,the proposed method is applied to a practi⁃cal regional power grid with enriching wind power resources.The effectiveness of the proposed method is verified by the simulation results.
作者
杨文佳
胡永浩
朱林
武志刚
易杨
YANG Wenjia;HU Yonghao;ZHU Lin;WU Zhigang;YI Yang(Electric Power Dispatching and Control Center of Guangdong Power Grid Co.,Ltd.,Guangzhou 510060,China;School of Electric Power Engineering,South China University of Technology,Guangzhou 510640,China)
出处
《南方电网技术》
CSCD
北大核心
2024年第6期69-78,共10页
Southern Power System Technology
基金
国家自然科学基金资助项目(U1766213,U22B6007)
中国南方电网有限责任公司科技项目(GDKJXM20198236)
广东省新能源电力系统智能运行与控制企业实验室开放基金项目(GPKLIOCNEPS-2021-KF-01)。
关键词
风电资源
动态等值
地区电网
残压
拓扑约束
wind power resource
dynamic equivalence
regional power grid
residual voltage
topology constraints
