Reactive voltage linkage control system and method for energy storage type doubly-fed wind generator and SVG (static var generator)

Abstract

According to the reactive voltage linkage control system and method of the energy storage type double-fed wind generator and the SVG, the energy storage type DFIG is linked with the SVG to carry out reactive compensation in a grading mode according to the reactive demand condition when the voltage of a grid-connected point drops, the reactive support is preferentially completed by the unit in the first stage, and the reactive voltage of the SVG in the second stage is controlled. The grid-side converter is converted from a unit power factor mode to a reactive compensation mode; if the residual reactive power is vacant, the SVG is used to assist the unit to carry out reactive compensation; and according to the real-time adjustment range of the reactive power of each unit, the second stage distributes the reactive capacity distributed to the wind turbine unit to each unit one by one. When the voltage drop of the grid-connected point is greater than 30%, the super capacitor needs to be put into consideration to ensure the normal operation of the unit.

Description

technical field [0001] The invention relates to the technical field of linkage control of wind farms and static var compensators, in particular to a reactive power and voltage linkage control system and method of an energy storage type doubly-fed wind motor and SVG. Background technique [0002] The penetration rate of wind power in the power system is increasing day by day, and the requirements of the power grid on the operating characteristics of wind turbines are also increasing. When the power grid fails, the fault ride-through capability of the power plant, the voltage support for the grid-connected point, and the reactive power compensation are widely concerned by the wind power industry. [0003] At present, the improvement of the voltage stability of the wind farm network is mainly by improving the control strategy and increasing the combination of hardware control circuits to make up for the shortcomings of the two independent control. The addition of hardware will...

AI Technical Summary

Problems solved by technology

When the power grid fails, the energy storage system is switched on and off, and the superconducting energy storage device and the machine-side converter are coordinated and controlled, but the coordinated control between the grid side, the machine side and the reactive power compensation equipment is not analyzed, and SVC reactive power output capability is proportional to the access point voltage, and the response speed is slow

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