考虑梯级耦合的水火电检修计划与机组组合协同优化

Collaborative maintenance scheduling and unit commitment for hydropower and thermal power systems considering cascade hydropower coupling

为避免传统的非协同优化模式下水火电系统检修计划和机组组合方案之间可能存在的冲突,文中以最小化系统总成本和检修计划调整成本为目标,考虑梯级水电耦合特性,建立水火电检修计划与机组组合协同的优化模型,并将其转换为混合整数线性规划模型。文中提出采用目标标度集合方法加速求解,将模型求解分成2个阶段。在第一阶段,标度目标函数中整数变量的系数,探测可能为0的整数变量;在第二阶段,确定取0值的整数变量并将其固定,求解简化的混合整数线性规划模型。以6机水火电系统和某实际省级86机水火电系统为测试系统,验证了文中所提模型与非协同优化相比,能获得更经济合理的检修计划和机组组合方案,所采用的目标标度集合方法能有效提高求解速度。

To avoid possible conflicts between the maintenance scheduling and the unit commitment for hydro-thermal power systems under the traditional non-collaborative optimization mode,a collaborative maintenance scheduling and unit commitment model for hydro-thermal systems is proposed,in which the total cost of the system and the adjustment cost of maintenance scheduling as an objective are minimized with considering the coupling characteristics of cascade hydropower.Furthermore,the model is transformed into a mixed integer linear programming(MILP)model.To improve the solution of the MILP model,the objective scaling ensemble approach is proposed,including two stages.In the first stage,the coefficients of integer variables in the objective are scaled and the integer variables that may take 0 are probed.In the second stage,the reduced MILP model is solved after determining and fixing the integer variables with a value of 0.Finally,a 6-unit hydro-thermal power system and an actual provincial 86-unit hydro-thermal power system are taken as test systems.The results show that the proposed model can obtain a more economical and reasonable maintenance scheduling and unit commitment scheme compared with the non-collaborative optimization mode,thus effectively improving the solution speed by the objective scaling ensemble approach.