Reactive coordination control method and system for direct-drive permanent magnet wind generator

Abstract

The invention discloses a reactive coordination control method and system for a direct-drive permanent magnet wind generator. The method comprises the following steps of receiving a voltage value of acommon grid-connected point obtained by detection; comparing the voltage value of the common grid-connected point with a preset grid-connected point voltage reference value; and if the difference between the voltage value of the common grid-connected point and the preset grid-connected point voltage reference value is within a preset range, starting a static synchronous compensator to carry out reactive power control, and meanwhile, enabling a grid side converter to continue to work in a constant power factor mode; and if the difference between the voltage value of the common grid-connected point and the preset grid-connected point voltage reference value exceeds the preset range, switching the working state of the grid side converter of the direct-drive permanent magnet wind generator, and performing reactive control with the static synchronous compensator in a combined mode. By implementing the method, when the grid-connected point voltage drops / suddenly boosts, the direct-drive permanent magnet wind generator provides stable reactive support for the power grid, so that the stability of the reactive margin and the grid-connected point voltage of the direct-drive wind power plantare improved.

Description

technical field [0001] The invention relates to the field of wind power generators, in particular to a reactive power coordination control method and system of a direct-drive permanent magnet fan. Background technique [0002] The continuous increase of wind power penetration has brought adverse effects on the safe and stable operation and dispatch of the power grid. In the event of a grid failure, issues such as the fault ride-through capability of the wind farm, voltage support for the point of common coupling (PCC), and reactive power compensation have drawn extensive attention from the wind power industry. At present, variable-speed constant-frequency wind turbines occupy a dominant position in the total installed capacity of wind power. The converters equipped with them can realize the decoupling control of active power and reactive power, so they can be used as an important reactive power source in wind farms to participate in reactive power regulation. my country's c...

AI Technical Summary

Problems solved by technology

[0004] Since the reactive power adjustment capability of wind turbines is affected by active power output, the reactive power capacity of wind turbines alone cannot meet the system regulation requirements, and it is necessary to centrally equip the wind farm with compensation units (see the paper "Static Synchronous Compensator, Static Synchronous Compensator, Static synchronous compensator for short) DC side voltage control method")

Most of the existing relevant literatures focus on the coordinated control of doubly-fed wind turbines and compensation units, and the direct-drive permanent magnet wind turbines are less involved and the research content is not detailed enough.

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