Low-voltage active distribution network congestion management method based on node marginal price

Abstract

A low-voltage active distribution network congestion management method based on node marginal price, Firstly, according to the basic principle of positive semidefinite programming algorithm, The nonlinear constraint in the low voltage active distribution network congestion management model based on intelligent soft switching is transformed into the positive semi-definite constraint by the positivesemi-definite relaxation technique, The original non-convex nonlinear model is transformed into a positive semi-definite programming model, and the symmetric component method is used to reduce the mutual impedance coupling between phases, so that the numerical stability of positive semi-definite relaxation can be improved by increasing the numerical difference of the elements in the positive semi-definite matrix. Then the sensitivity factors of branch active power, branch reactive power, node voltage variation and network loss to node injection power are calculated based on the linearizationapproximation principle. Based on the sensitivity factor, a node marginal pricing model is established. The invention can effectively reduce the difficulty of problem solving and ensure the calculation accuracy while improving the calculation speed. It can effectively solve the congestion management problem of low-voltage active distribution network.

Description

technical field [0001] The invention relates to a blocking management method for a low-voltage active distribution network. In particular, it relates to a congestion management method for low-voltage active distribution networks based on node marginal electricity prices. Background technique [0002] With the increasingly severe energy crisis and environmental pollution problems, distributed energy sources such as electric vehicles and distributed power sources have received extensive attention and rapid development. Distributed energy with high penetration rate provides flexible dispatchable resources for the operation optimization of low-voltage power distribution systems, but it also brings new challenges to its safe and economic operation and management. [0003] From the perspective of operation mode, the low-voltage power distribution system itself has three-phase asymmetry characteristics due to the phenomenon of line parameter asymmetry and load access power asymmet...

AI Technical Summary

Problems solved by technology

From the perspective of direct control, the line capacity of the low-voltage distribution network is often small, and it is necessary to use methods such as network reconfiguration and load shedding to solve the problem of system congestion. Multi-period continuous regulation of power flow in distribution network

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