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中文摘要：
市场环境下，电网投资面临着上网电价、各类用户的销售电量、基准折现率等不确定性因素，其波动将给供电公司带来经营风险，因此研究不确定性条件下的电网投资决策模型具有一定的实际意义。从成本和收益的角度，构建电网投资的成本-效益净现值（net present value，NPV）模型，并分析其存在的不确定性因素；根据集对分析的定义和性质，推导出集对分析的运算法则和i值的确定方法，并说明其应用的合理性；运用集对分系数公式进行推导，并根据净现值的公式，构建电网投资的决策评价模型。算例表明所构建的决策评估模型是可行的，可为供电公司的电网投资提供一定的参考。
英文摘要：
There are a lot of uncertainties in power grid investment activities, such as generation price, electricity sale of kinds consumers and benchmark return rate in power market Their fluctuation will give power-supplying company some operation risk. So To research the decision-making model has a considerable importance for power grid investment in uncertain conditions. The paper builds the cost-benefit net present value （NPV） model for power grids investment and analyses it＇s uncertainties. Based on definition and characteristic, the operation rules of set-pair and calculation method of ＂i＂ are deduced, and the rationality in application is also explained. With set-pair analysis rules the paper induces the set pair coefficient formula of uncertainties in power grid investment, and constructs the decision-making model of investment according to NPV formula. The example shows the model is feasible and can provide power supplying company some references to investment.
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