农网规划建设中配网电压等级的选择分析

Voltage grade selection analysis of rural power network planning and construction

根据农网的现状以及新农村建设对农网电力负荷的影响,以河南某地区县级电网的现有网架结构和负荷数据为基础,对中长期电网规划的电压等级选择进行分析。结合该地区具体的网架和负荷发展情况,所确定的两种规划方案均满足供电可靠性要求,以远期最终的经济性为主要考察指标,其中包括建设费用、原有设备的折旧、资金的时间价值、主变损耗以及线路损耗的资金折算、运行维护费用等,对农网配电网电压等级的确定以及电网建设的过渡网架进行了经济性评价。通过对两种方案最终的经济性比较得出的结论表明,电网建设应结合远期规划目标确定新建站的电压等级。

According to the present situation of the rural power network and the effect which are made to the rural power load by the new countryside construction, based on the grid structure and load data of an area in Henan province, this paper points out the necessity of selecting voltage level. Combined with the specific situation of the network and load development in the region, it identifies two types of program planning which can ensure power supply reliability. The two schemes take the ultimate economy as main value index, including construction costs, the conversion of obsolete equipment funds, the time value of money, the conversion of the main transformer and line loss funds, operation and maintenance costs and so on. The economy of rural distribution voltage grade and transitional grid is evaluated. By comparing the two programs of economy, it reaches the conclusion that power grid construction should combine with long-termed planning goals to determine the voltage grade of the newly built substations.