源荷储一体化的广义灵活电源双层统筹规划

高比例可再生能源电力系统中,逐渐减少的传统机组灵活性资源与增加的灵活性需求之间的矛盾日益严重,开展灵活电源专题规划的必要性日益凸显。基于灵活性供需平衡机理,提出了源荷储一体化的广义灵活电源概念,并建立了含资源投资决策和运行模拟校验的双层统筹规划模型。在证明了规划模型的凸性基础上,基于最大净收益增量比优化目标,设计了两阶段迭代求解优化算法。最后,通过中国北方某大型风电基地实际数据,对基准规划场景进行了评估,分析了系统灵活性缺额问题,并采用所述模型对源荷储资源进行优化规划,讨论了储能和需求侧响应在未来规划中的应用。算例表明,所提出的灵活性协调优化方法能够将灵活性量化评价指标纳入到电力系统规划中,优化得到不同约束阈值下的最优方案,能够快速进行参数灵敏度分析,从而提高优化方案的鲁棒性和适用性。

Bi-level Optimal Planning of Generation-Load-Storage Integrated Generalized Flexibility Resource

In power systems with high penetration renewable energy, the contradiction between the reduced conventional flexible generation resource and the increased flexibility demand is becoming increasingly serious. According to the flexibility balance principle, the concept of generalized flexibility is proposed and the bi-level optimal planning model including investment decision and production simulation verification is developed. Then the convexity of the planning model is proved and a two stage algorithm proposed based on the maximum net benefit/increment ratio. Finally, through the actual data of a large wind power base in north China, the benchmark scenario is evaluated, and the problem of system flexibility deficiency is analyzed. Meanwhile, the optimal planning for generation-load-storage source is implemented by the proposed model, and the sensitivity analysis for storage and demand response is discussed. The case study indicates that the proposed method can integrate the flexibility assessment in power system planning, which can also quickly conduct the sensitivity analysis to improve the robustness and applicability.