Lin’an Medium Voltage Distribution Network Planning

This paper Lin’an city planning and distribution network planning area, the general situation and the situation from the distribution network power demand forecasting, distribution network development planning in three aspects, including:The general situation and the distribution network planning areas:according to the present situation of Lin’an City Township distribution, Lin’an city will be divided into East, West, in three for the District, distribution network status based on power supply section on analysis, due to three for the district development maturity is different, its distribution network is at a different stage, with the analysis of current power grid emphasis is also exist differences. The Eastern Division mature, distribution network development in the early period to improve the transition stage, this time focusing on the grid structure analysis of distribution network of normative, load transfer capacity and reliability indices. In the West Division, and slow development in the early stages of development, distribution network, distribution network analysis focuses on the equipment level and operation level.Power demand forecasting:Based on the analysis of Lin’an city social economic and historical load development trend, power demand forecasting. The prediction method uses mathematics model and spatial load forecast combining both distribution, growth trend and the load of the space, and cross check the forecast results, to 2020, Ling’an City, the whole society electricity consumption of the whole society in 5639000000 kWh, maximum load 1095.6MW,2014-2020 average annual growth rates were 9.25% and 10.76%.Distribution network development planning:Based on power supply on the division, by far and near the idea of distribution network development planning. The first in-depth analysis of the domestic and abroad and Lin’an typical connection modes for distribution network, research on matching connection mode with the load density, and on this basis to build Lin’an city zoning target net Again with the target net as the goal, to the status quo of grid based transition years, distribution network planning. To the target year, Lin’an medium voltage distribution network connection modes for cable with single ring, double loop network and overhead line multi segment and multi contact, multi segmented single tie connection mode. The average length of main line is 2.72km, the cable insulation rate is 18%, rate of 100% overhead line, N-1 through rate 95.5%. Integrated voltage qualification rate reached 100%, comprehensive line loss rate of 2.92%.