考虑调度措施的地区电网多风险场景柔性水平评价模型

Multi-risk-scenarios flexibility evaluation model of regional power gridconsidering economic efficiency of dispatching measures

新能源大量接入地区电网导致地区电网潮流和电压波动增大,设备重过载风险增加。面向新能源功率的强不确定性,快速准确地识别设备重过载风险场景,优化调用源-网-荷三方柔性资源消除潜在运行风险,是高比例新能源地区电网安全运行的迫切需求。文中首先提出柔性需求指数、柔性裕度指数和柔性资源利用率等面向地区电网柔性运行水平的定量评估指标,可以全面衡量地区电网的运行灵活性需求、柔性资源配置和运行调控水平;其次,以柔性评价指标为目标,提出考虑多风险场景的柔性资源优化调度数学模型和计算方法,模型考虑了地区电网运行方式和开环点灵活设置的调度措施;最后,与传统边界场景分析方法进行对比,验证文中所提柔性评价模型和方法的有效性和优越性。结果表明,文中所提指标、模型和算法可以全面反映地区电网的柔性运行需求和能力,考虑的风险场景丰富,应对风险的柔性资源调度方案能兼顾调度措施的经济性和全面性。

Because of the integration of large amount of new energy sources,the power flow variation and voltage volatility in regional power system increase and it escalates the risk of equipment overload.In face of the uncertainty of new energy power,quick and accurate identification of the overload risk scenarios,and optimal utilization of various flexible resources from the source-grid-load parties to eliminate potential operational risks,are the urgent demands for the secure operation of the regional power grids.The flexibility evaluation indexes for the regional power grid are proposed,i.e.the flexibility demand index,the flexibility margin index and the flexibility resource utilization index,which comprehensively measure the requirements,resource and operation level of a regional power system for flexible operation.Under the target of the flexibility measurement,the mathematical models and computational method considering multiple risk scenarios are proposed,and the operation mode adjustment and the open-loop points scheduling are taken into account as the control measures.Case studies validate the feasibility and superiority of the proposed flexibility evaluation model,in comparison with the traditional boundary scenario analysis.The test results indicate that the proposed indicators,models,and algorithm can reflect the requirements and capabilities of regional power grids for operational flexibility with consideration of rich risk scenarios.The obtained dispatch solutions take into account both the economic and comprehensive aspects of various flexibility dispatch measures.