Comprehensive coordination control policy of reactive voltage of power distribution network

Abstract

The invention relates to a comprehensive coordination control policy of the reactive voltage of a power distribution network, and belongs to the technical field of voltage control of the power distribution network. The coordination control policy is executed by following steps: 1) acquiring parameters of the power distribution network; 2) establishing an equivalent network of the power distribution network; 3) calculating a power grid voltage deviation value of the power distribution network based on the equivalent network in step 2; 4) setting a target function and constraint conditions; 5) solving the target function and the constraint conditions; 6) determining integral solutions of solutions or a solution set in step 5) by employing a branch and bound method; and 7) forming a final combined coordination control scheme according to the integral solutions obtained in step 6), and giving a control command of the transformer gear position and capacitor set switching. According to the method, optimization is realized in consideration of characteristics and communication conditions of regional power distribution network equipment by regarding the minimum global node voltage deviationdegree as the target, and effects of improving the power factor of the power grid and reducing the transmission loss are achieved.

Description

technical field [0001] The invention relates to a comprehensive coordinated control strategy for reactive power voltage of a distribution network, belonging to the technical field of distribution network voltage control. Background technique [0002] The operation state of distribution network is greatly affected by the system operation mode and load changes, and the problems of "high voltage" and "low voltage" are very easy to appear. Due to the long-distance and large-radius power supply of the local distribution network, especially the load of some distribution networks is affected by the industrial, enterprise production period and seasonal periodic changes, the load is heavy in a short period of time, and the problem of "low voltage" frequently occurs. The loss is large; in other time periods, the load is light, and the problem of "high voltage" is prone to occur, resulting in a surge in transformer excitation current, an increase in harmonic components, excessive volta...

AI Technical Summary

Problems solved by technology

The huge and complex scale of the distribution network determines that it is impossible to implement measures during the operation period by means of manual scheduling

Some areas rely on the automatic reactive power compensation device for automatic switching of capacitor banks. This is a decentralized control method. The equipment operates more times and is prone to failure. The action strategy is based on the operation of the local power grid and cannot Take into account the adjustment effect on the whole

[0004] In view of the above problems, there is an urgent need for a suitable optimal control method to solve the prominent "high and low voltage" problems in the local distribution network where industrial and enterprise loads are the main load and the load is concentrated in the back section of the line.

Images