现货交易中梯级水电站竞价上网的研究

该文讨论了影响水电电价的水价及水电机组启停费用因素，提出了将水火电混合动力系统划分为两个独立的竟价子集，在各子集内部依据购电费用最低的原则竟价上网。求解过程首先按照水电配合火电竞价上网的方式，采用网络流法初步优化梯级水电站的出力；然后在梯级水电站竟价子集内部按照购电费用最低的原则竞价上网，采用同时段调整法优化水电的出力。该文提出的模型简单，算法易于实现。算例结果表明该方法具有良好的实用性。     

电力市场中梯级水电站优化运行的研究

研究了在发电侧电力市场中梯级水电站的优化运行问题，提出了改进的网络流优化算法。该算法将梯级水电站的优化运行过程分为寻找可行流与同一时段优化出力两个阶段，在寻找可行流阶段采用经典的网流法，各梯级水电站按照相同的步长增加发电流量；在同一时段优化出力阶段采用改进的网流法，对各梯级水电站按照各自不同的步长进行优化。该算法模型简单，容易实现。算例结果表明，改进的网络流优化法计算精度高，实用性强，适用于梯级水电站优化运行的解算。     

Optimal operation of cascaded hydroelectric power plants in the power market

An improved network flow algorithm, which includes the minimum cost network flow and the same period network flow, is proposed to solve the optimization of cascaded hydroelectric power plants in a competitive electricity market. The typical network flow is used to find the feasible flow and add the discharge water to different cascaded hydroelectric power plants at the same step. The same period network flow is used to find the optimal flow and add the power output at a different step. This new algorithm retains the advantages of the typical network flow, such as simplicity and ease of realization. The result of the case analysis indicates that the new algorithm can achieve high calculation precision and can be used to calculate the optimal operation of eascaded hydroelectric power plants.