中文摘要：

中国水电大规模跨省跨区输送为调控配置多个电网间优质资源以缓解日益严重的调峰压力提供了重要途径。该文以跨省送电梯级水电站群调峰问题为背景，提出一种两阶段搜索方法。第一阶段采用负荷重构策略将多个省级电网差异极大的负荷曲线重构为一条总负荷，在此基础上采用变尺度优化方法确定水电站出力过程，避免电网间负荷大小和高峰低谷等特性不同导致的出力搜索困难；第二阶段提出外点搜索方法优化电站出力在受端电网间的分配过程，采用逐次切负荷生成初始解，并将负荷高低作为启发信息，迭代修正各受端电网的高峰电力大小，以满足多个电网调峰要求。提出的方法通过华东电网新一富梯级和中国南方电网红水河干流梯级水电站群调度得到验证，2个实例的应用结果都满足多个省级电网调峰需求，较实际调度的调峰效果更为显著。

英文摘要：

The inter-province and inter-region transmission of large-scale hydropower is an important way to coordinate power resources among multiple provincial power grids to meet the rapidly increasing demands for peak loads of China electrical power systems. To deal with the problem in the peak operation of cascaded hydropower plants serving multiple provincial power grids, a two-stage search method was proposed. At the first stage, a load reconstruction strategy was used to develop a total load curve based on multiple load curves of provincial power grids in order to deal with the solution difficulty caused by discrepant load values, peak, valley, etc. With the reconstructed load curve, a mutative-scale optimization method was employed to determine the generation schedules of hydropower plants. At the second stage, an exterior point search method was developed to allocate the power generations among multiple power grids. This method generated the initial solution by the load shedding method and took the load values as heuristic information to iteratively adjust the peak power transmitted to the power grids. The proposed method have been implemented to the operations of Xin-Fu cascaded hydropower plants of East China Grid and Hongshuihe cascaded hydropower plants of China Southern Grid. The results from two cases show that our method can meet the demands for peak-shaving of multiple provincial power grids, and show advantages over the actual operation.