High-voltage network high-capacity powerfree compensation continuous regulation method

Abstract

Provided total reactive power Q requested by system is supplied by n pieces of reactive compensation branch. A fixed capacitor is connected to a variable voltage source in one piece of compensation branch to supply 0-Q / n continuous controlled reactive power. Other n-1 pieces of compensation branch connect fixed capacitor to power source to supply fixed reactive powers. System reactive power is continuous controlled from 0-Q by continuous controlling reactive power in first piece of compensation branch and switching to other compensation branches. The capacity Qv of variable voltage source is only 1 / 4n of Q. Switching operation is implemented at time of zero current of all capacitors in n pieces of reactive compensation branch in order to avoid impulsion from electric network. Features are: low cost to realize reactive continuous control for electric network in high voltage, and prolonging service life of capacitor and switches.

Description

technical field [0001] The invention relates to a large-capacity reactive power compensation continuous adjustment method for a high-voltage power grid, which can be used for reactive power compensation of a 6KV and above power grid, and belongs to the technical field of electric power systems. Background technique: [0002] At present, the main methods of reactive power compensation for 6KV and above power grids at home and abroad are as follows: [0003] 1) Provide capacitive reactive power for the power system through capacitor switching to improve the power factor of the power supply system. [0004] 2) By adjusting the conduction angle of the thyristor, the magnitude of the current passing through the inductor can be changed, and the size of the inductive reactive power can be adjusted to maintain the stability of the grid voltage. [0005] But this traditional method has the following outstanding problems: [0006] 1) Capacitor switching of large-capacity reactive po...

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