水电能源科学

特高压交流电网建设的不断完善使跨省多区域电力资源配置能力得到提升，为解决区域内电力系统间联络线耦合分档和备用容量不足的问题，引入抽水蓄能(简称“抽蓄”)电站作为柔性调控节点，对抽蓄电站参与特高压电网跨省柔性调度进行深入探究。研究计及抽蓄电站运行、多电网负荷和风电出力特征，制定灵活的联络线功率分档策略并添加联络线耦合约束，构建以多电网剩余负荷峰谷差之和与弃风量最小为目标函数的协同调用模型。结果表明，在送电比例R_g分别取R_A=0.448、R_B=0.552时，电网A、B剩余负荷峰谷差分别下降2 540、1 665 MW,峰谷差之和降低10.2%。在优先消纳风电模式下，弃风率降至0。同时通过调整联络线功率档位验证了模型在特高压环网多场景中应用的潜力。

The continuous improvement of UHV AC power grid construction has improved the ability of power resource allocation across provinces and cities in multiple regions. In order to solve the problems of coupled staging and insufficient reserve capacity of connection lines between power systems in the region, pumped storage(referred to as ‘pumped-storage') power station is introduced as a flexible regulation and control node, and the participation of pumped-storage power station in the cross-provincial flexible scheduling of UHV power grid is explored in depth. The study takes into account the operation of pumped storage power station, load and wind power output characteristics of multiple power grids, and formulates a flexible connection lines power shifting strategy and adds connection lines coupling constraints. A coordinated schedule model is established by minimizing the sum of the peak-to-valley difference of the residual loads of multiple power grids and the amount of abandoned wind as the objective function. The results show that the peak-to-valley difference between the remaining loads of grids A and B decreases by 2 540 MW and 1 665 MW respectively, and the sum of the peak-to-valley difference decreases by 10.2% when the transmission ratio R_g is R_A=0.448 and R_B=0.552 respectively. Under the priority wind power consumption mode, the wind abandonment rate is reduced to 0. Meanwhile, the potential of multi-scenario application of the model in the UHV ring network is verified by adjusting the power slot of the connection lines.