电网直购电极限规模及评估指标体系研究

Ｒesearch on Upper Limit and Evaluation Indices of Direct Power Purchase

摘要:

直购电规模的扩大，可能降低峰谷调节能力、加剧输电断面载荷，使得不同容量机组利用小时数不均衡，增加 了电网调度难度。因此需要根据发输电约束确定直购电规模，量化评估影响因素。提出了直购电规模上限的量化计 算方法。根据历史负荷数据，预测电网负荷。增加大机组开机，减小小机组开机，从而量化直购电规模上限。构建评 估指标体系，量化调峰能力、断面载荷、扣减系数等对直购电规模的影响。算例结合实际电网数据验证了所提模型的 可行性与正确性。

Abstract:

The increase of direct power purchase may reduce the regulation capability to peak /valley loads and intensify the loading of transmission sections，which yield more diverse utilization hours of the thermal units with different capacities，thus add difficulty to power dispatching． Therefore，it is necessary to decide the upper limit of direct power purchase and analyze the influencing factors． The quantitative calculation method for the upper limit of direct power purchase is proposed． Based on the historical load data，the load is forecasted． The upper limit of direct power purchase can be quantified by adjusting the thermal units with large or small capacities． The relative factors，such as the regulation capability to the peak /valley loads， transfer capability of critical transmission sections and the reduction coefficients are analyzed to derive the evaluation indices． The numerical results of a practical system verify the feasibility and accuracy of the proposed algorithm and indices．