In this paper, several effective means of reducing the active power loss and a method to evaluate the energy-saving potential are proposed for regional main power grid. The investigation mainly involves the optimal replacement of heavy transmission lines, the economic operation of the main transformer, the load distribution optimization , the optimal dispatching of power plants and the reactive power optimization. Then, a general idea of energy-saving planning is presented, and a case study is performed on an actual regional main power grid to evaluate the energy-saving potential according to a series of flow and reactive power optimization calculation. Finally, a relevant energy-saving planning is worked out and its energy-saving effectiveness is verified.%提出了降低地区主网有功损耗的有效手段及主网节能潜力评估方法,主要涉及重载线路导线优化更换、主变压器经济运行、负荷分布优化、电厂优化调度和无功优化配置5个方面,并给出了制订地区主网节能规划的思路.结合某市实际电网,进行了一系列的潮流计算与无功优化计算,评估了各种节能手段的潜力,据此制订了相应的节能规划,算例表明所提方法具有较好的主网节能降耗效果.
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