AC-DC hybrid power grid dynamic reactive power optimization control method based on voltage sensitivity

Abstract

The invention provides an AC-DC hybrid power grid dynamic reactive power optimization control method based on voltage sensitivity, and relates to the technical field of power system reactive voltage control. Directed at an AC-DC hybrid power grid in a certain region in China, a dynamic voltage stable state model is established for a new energy power supply and matched dynamic equipment thereof, and the dynamic reactive voltage characteristic of a large grid frame is analyzed by using a decentralized continuous reactive power optimization decoupling calculation and particle swarm optimization calculation voltage sensitivity method. According to the invention, two forms of an optimization algorithm and software state analysis are provided to analyze the voltage sensitivity of the power grid, so that the optimization process of the dynamic reactive voltage is realized from two perspectives of a distributed phase modifier and local reactive power compensation equipment, and the optimal distribution of the reactive power compensation equipment and the operation solution of weak points of the voltage sensitivity are realized; the voltage robustness of the system and the operation efficiency of reactive power equipment are improved, the voltage characteristics of the AC-DC hybrid power grid are reflected more accurately, and the method has important significance for improving the safe and stable operation of the power grid.

Description

technical field [0001] The invention relates to the technical field of reactive power and voltage control in electric power systems, in particular to a dynamic reactive power optimization control method for an AC / DC hybrid power grid based on voltage sensitivity. Background technique [0002] The UHV DC transmission system faces many problems in terms of stable voltage operation. The UHV DC transmission system transmits a huge amount of active power. Once a bipolar locking accident occurs, the system will suffer huge disturbances, resulting in a large-scale transient voltage rise and wind power outages. On the other hand, the DC transmission system itself consumes a large amount of reactive power during normal operation, and the system needs a large amount of reactive power support. With the continuous increase of wind power installed capacity and grid-connected capacity, the safe and stable operation of UHV new energy grid voltage is seriously challenged. In order to impro...

AI Technical Summary

Problems solved by technology

Due to the decentralized and local characteristics of these controls, they cannot reflect the overall reactive voltage operating characteristics and stability of the system, thus resulting in the inability to coordinate and cooperate among the various decentralized controls.

Under certain operating conditions, it may bring adverse effects to the system, such as the oscillation of reactive power, the increase of system power loss, etc.

[0004] In modern large regional power grids, UHVDC and large-scale new energy coexist, especially after HVDC is put into operation, the reactive power exchange of the system is relatively large, the difficulty of reactive power balance and voltage control increases, and there are hidden dangers in the safe operation of the system

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