Method for controlling overvoltage of active power distribution network on basis of active-reactive coordination

Abstract

The invention relates to a method for controlling an overvoltage of an active power distribution network on the basis of active-reactive coordination and belongs to the technical field of operation and control of a power system. According to the method, a control target function of a distributed power supply is established, a three-phase flow equation of operation of the active power distribution network is derived by utilizing a three-phase node and branch incidence matrix, a grouping switched capacitor is processed in a binary coding manner and the discrete control problem is continuously solved; finally, active powers, reactive powers and the like of the distributed power supply, a continuous reactive compensation device and the grouping switched capacitor in the active power distribution network are comprehensively controlled so as to control the overvoltage of the active power distribution network. The method not only can be used for a radial power distribution network, but also can be directly used for controlling the overvoltage of a weakly looped power distribution network which is subjected to loop closing; the method introduces the binary coding manner into control on the overvoltage of the active power distribution network, enables the discrete problem to be continuous and greatly improves calculating efficiency.

Description

technical field [0001] The invention relates to a method for controlling the overvoltage of an active power distribution network based on active power-reactive power coordination, and belongs to the technical field of power system operation and control. Background technique [0002] The development of distributed generation (Distributed Generation, DG) can optimize the energy structure, promote energy conservation and emission reduction, and achieve sustainable economic development. In recent years, the penetration rate of distributed power in the distribution network has grown rapidly, and the traditional distribution network will gradually evolve into an active distribution network (Active Distribution Network, ADN) with many adjustable and controllable resources. to many challenges. [0003] In the active distribution network, the overhead line generally does not perform three-phase overall cycle transposition, and the phenomenon of load imbalance in the active distribut...

AI Technical Summary

Problems solved by technology

[0003] In the active distribution network, the overhead line generally does not perform three-phase overall cycle transposition, and the phenomenon of load imbalance in the active distribution network is common. The analysis and decision-making based on the single-phase model often introduces large errors, resulting in wrong dispatching. Strategies that affect the safe and economical operation of distribution networks

[0004] In addition, the line resistance and reactance in the active distribution network are close to each other, and the active power and reactive power are tightly coupled. The fluctuations of active power and reactive power injected by nodes in the active distribution network can both affect the node voltage. Simple reactive power control Limited change in voltage

If the existing equipment in the active distribution network is unreasonably managed, it will cause serious problems such as wasting renewable energy, degrading voltage quality, and violent fluctuations in the root node power of distribution transformers. Therefore, the coordinated control of active power and reactive power in power distribution Grid overvoltage is an important topic

Images