水火电联合调峰电力电量平衡优化模型

Study on electric power and energy balance optimal model of combined peak shaving by hydro and thermal power

水火电联合调峰情况下,以弃水电量最小为原则的电力电量平衡计算未考虑火电站的经济运行方式,存在一定的不足。从电力系统经济运行角度出发,以火电站运行煤耗成本与水电站弃水电量机会损失成本之和为系统总成本,建立了总成本最小的电力电量平衡优化模型。模型求解方面,考虑到机组组合优化和经济负荷分配问题的求解难度,采用了双层嵌套寻优算法,外层采用枚举法进行机组组合遍历寻优,内层采用等微增率法进行煤耗最小寻优。以云南省滇中区域电网典型日平衡计算为例,分别按照总成本最小模型和弃水电量最小模型计算了水火电调峰运行过程。计算结果表明:前者虽然弃水电量机会损失大于后者,但火电煤耗成本远小于后者,系统总成本更小。

In the case of combined peak shaving by hydro and thermal power,there are some problems in the calculation of electric power and energy balance based on the principle of minimum electricity loss caused by abandoned water,without considering the economic operation mode of thermal power station.From the view of power system economic operation,this paper takes sum of the cost of coal consumption of thermal power station and the opportunity cost of electricity loss caused by abandoned water as the total cost of the power system,and establishes the optimization model of electric power and energy balance with the minimum total cost.In terms of the algorithm,considering the difficulties of unit combination optimization and economic load distribution,the double nested optimization algorithm is adopted.The outer layer adopts enumeration method for unit combination traversal optimization,and the inner layer adopts equal incremental rate method to calculate the minimum cost of coal consumption.A typical daily power balance calculation of a regional power grid in Yunnan Province is taken as an example,the peak shaving operation process of hydro and thermal power is calculated according to the minimum total cost model and the minimum electricity loss caused by abandoned water model respectively.The calculation results show that although the opportunity loss of electricity loss caused by abandoned water of the former is greater than the latter,the operation cost of thermal power is far less than the latter,so the total cost is also less than the latter.