钢铁企业自发电与外购国家电网电之间的经济利益

针对当前钢铁联合企业自产电和国家电网价格之间的关系,利用经济规划方法建立了基于自发电的最优经济运营模型.通过求解企业利润最大的目标函数,并讨论分析在国家电网峰、谷、平时电价企业的最优生产计划.最优结果显示,企业利润的高低主要与购入电力转售后的单位利润贡献率、自供电的单位利润率及其上网的售电量有关系.鼓励企业在谷价时尽量外购电,少发电;而在峰价时,尽量自发电,少外购电,富余的电上网销售.

Economic Benefit Between Autonomous Power and Purchasing Power from State Grid in Iron and Steel Enterprises

In view of the current price relationship between autonomous power and state grid power in iron and steel enterprises， an optimal economic management model of autonomous power plant was established using the method of economic planning. The optimal production and distribution plan of enterprise and the optimal power purchasing scheme considering the peak-valley power prices were discussed by solving the enterprise’s profit maximum function. The optimal schemes and results show that the level of the enterprise’s benefit has relationships mainly with the buying-power unit profit contribution after resale， the power supply unit profit and the quantity of power sale to grid. It is encouraged that， more outsourcing and less autonomous power is used as far as possible at the valley price of grid power， and more autonomous and less outsourcing power is used as far as possible and surplus electricity is saled online at the peak price of grid power.