考虑风–光–光热联合直流外送的源–网–荷多时段优化调度方法

为解决西北地区大规模风光并网下电力系统的新能源弃电问题，提出一种考虑风–光–光热联合直流外送的源网荷多时段协调优化方法。首先，对源网荷三侧具备的调峰能力及其互补特性进行分析，充分利用源侧光热电站、网侧特高压直流联络线以及柔性负荷的灵活调节能力，提高风光资源利用率。其次，针对新能源、负荷预测精度日前–日内逐步提高的特点，结合源网荷三侧各类调峰资源具有不同响应速度的特性，并以系统综合运行成本最低为目标，构建源网荷日前–日内两阶段多时段优化调度方法；最后，以西北某省电网2025规划构造的算例仿真验证了该调度方法能够有效促进高比例新能源电网的风光消纳，降低系统运行成本。

Source-grid-load Multi-time Interval Optimization Scheduling Method Considering Wind-photovoltaic-photothermal Combined DC Transmission

In order to solve the problem of new energy curtailment in the power system with large-scale wind and solar grid-connected power in Northwest China,a source-grid-load multi-time interval coordinated optimization method considering wind-photovoltaic-photothermal combined DC transmission was proposed.Firstly,the peak modulation capabilities of the three sides of the source,grid and load and their complementary characteristics were analyzed.The rapid peak modulation capabilities of the source-side concentrating solar power plants,the grid-side HVDC tie-line and the demand-side flexible load were used to improve wind and solar resources utilization rate.Secondly,in view of the gradual improvement of new energy output and load forecast accuracy in different dispatching stages,considering the different response speed characteristics of various peak modulation resources on the three sides of the source,grid and load,with the lowest comprehensive operating cost of the system was the objective,and a two-stage multi-time interval optimal dispatching method for source-grid-load was constructed.Finally,a simulation example of a power grid 2025 planning structure in a northwest province proved that the dispatching method can effectively improve the level of wind and solar consumption,and reduce the overall operating cost of the system.