Research And Application Of Distribution Grid Investment Effectiveness Evaluation And Decision-making Model

The development and construction of large scale distribution network is a complicated and arduous system engineering with many uncertain factors and involving a wide range.In recent years,35 thousand volts and below distribution network construction and transformation of the scale of demand increased year by year,and for the approved investment of distribution network project indeed less,need to make full use of every investment,to produce the maximum benefit.Currently,the distribution network evaluation system is often biased towards a particular aspect such as content planning effectiveness,safety,reliability,etc.The project's feasibility study is lack of the demonstration of a project's investment efficiency.In the investment allocation,usually only according to the historical data of the simple proportion,or just according to the size of the sale of electricity distribution,the investment decision is easy to form the "Matthew effect",the county power supply enterprises to weak power grid due to the power grid construction investment is insufficient in the long term power grid becomes increasingly weak.Facing with these problems,this paper concerns the aspects of the overall investment effectiveness,single project investment effectiveness,investment decisions and establishes the investment effectiveness evaluation and decision-making model of 35 k V or below.This model proposes 19 new indicators to evaluate the effectiveness of single project investment,and it gives out the scoring function of calculating the index score.It also gives out evaluation model of calculating distribution network's scores of the overall investment and monomer investment's efficiency.According to the investment effectiveness evaluation scores,we determine the level of overall investment effectiveness and set priorities of single project investment.This paper also proposes annual investment decision model based on the grid scale and electricity sales and the score level of annual single project investment benefit.We take the 35 k V distribution network as an example to test and verify the scientific usefulness of the model.It has great significance to the distribution network's evaluation and investment decisions.