A Differential Planning Method for Medium-Voltage Lines in Distribution Networks Considering the Uncertainty of Load Forecasting Errors

Abstract

The invention integrates the idea of ​​regional differential division into distribution network planning, fully considers the uncertainty distribution of load prediction errors, and proposes a differential uncertainty planning method for 10kV medium-voltage lines in low-load density areas. Firstly, on the basis of the probability characteristic model of load forecasting error, a mathematical model of medium-voltage line planning based on chance constraint theory is constructed. Aiming at the problem of the confidence level value in the model, the anti-risk ability of the distribution network in the planning area is firstly treated by the comprehensive weighting method Carry out differentiation analysis, and then select the corresponding confidence level for distribution networks with different anti-risk capabilities. Compared with the traditional planning method, the method proposed by the present invention can not only realize the overall coordination of risks and costs, but also fully consider the differentiated characteristics of the development of different distribution sub-regions in low-load density areas, thereby effectively improving the planning of distribution network. level of refinement. The simulation results based on actual calculation examples verify the correctness and effectiveness of the method proposed in the present invention.

Description

technical field [0001] In the present invention, a differentiated uncertainty planning method for 10kV medium-voltage lines in low-load density areas is proposed, which incorporates the idea of ​​regional differentiation and fully considers the uncertainty distribution of load forecasting errors. The invention relates to wire diameter planning for a distribution network, which belongs to the technical field of medium-voltage distribution network planning. Background technique [0002] At present, the problem of low voltage in my country's distribution network is serious. When the load density is less than 1MW / km 2 The agricultural and pastoral areas are particularly prominent. In areas with low load density, long power supply distances and obsolete distribution network equipment are the main causes of low voltage problems, and the distribution network, especially the transformation of medium-voltage lines in distribution networks, is an important means to solve low voltage ...

AI Technical Summary

Problems solved by technology

Although the chance-constrained programming method successfully applies the chance-constrained theory to some distribution network planning problems, on the one hand, it focuses on the study of the location and capacity of distributed power generation and the energy scheduling of generating units. It is rarely used in the problem of wire diameter selection; on the other hand, the confidence level in the planning model is often taken uniformly, without considering the differences in regional development levels

However, studies have shown that in low-load density areas with a wide power supply range, due to the huge differences in the economic level and load structure of different villages and towns, the distribution network's tolerance to various risks is also different.

Images