Excitation control method and device for wind driven generator for wind power plant with sharing mechanism

Abstract

The present invention provides an excitation control method and device of a wind driven generator for a wind power plant with a sharing mechanism. An alternating-current voltage is superposed on dq-axis voltage of a rotor of a doubly-fed generator, vector control of the doubly-fed generator is realized, and electromagnetic torque fluctuation amplitude caused by three-phase unbalanced power grid voltage is reduced. According to the technical scheme provided by the invention, the situation that when the three-phase voltage imbalance phenomenon of the power grid occurs, the dq-axis voltage of thegenerator stator can generate alternating current voltage is considered, and a group of alternating current electric quantity with the same frequency as the stator side is superposed on the dq axis of the generator rotor, so that the electromagnetic torque vibration amplitude of the generator is reduced. Compared with the prior art, the electromagnetic torque fluctuation amplitude of the doubly-fed wind generator under the unbalanced power grid voltage can be effectively reduced, and a necessary condition is provided for stable operation of a wind power plant of a sharing mechanism.

Description

technical field [0001] The invention relates to the technical field of wind power generation, and relates to an excitation control method and a control device for a wind power generator under the requirements of a sharing mechanism wind farm. Background technique [0002] The unbalanced three-phase voltage of the power grid will cause the electromagnetic torque oscillation of the wind turbine. Although the power quality standards in Europe, America and China impose restrictions on the unbalanced degree of grid voltage, the grid under the restrictions of power quality standards may still cause large fluctuations in the electromagnetic torque of wind turbines, and electromagnetic torque oscillations will cause wind turbines to Chain reaction, wind turbine power and transmission chain will be affected. [0003] All wind turbines in the wind farm share data, coordinate control, improve power station control quality and unit protection efficiency, that is, share mechanism wind f...

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Problems solved by technology

[0007] In order to ensure that when the wind turbine is working in the power system, when the three-phase load imbalance occurs and the grid voltage is unbalanced, it can cope with the electromagnetic torque oscillation of the wind turbine caused by the three-phase voltage imbalance of the grid. Problem, the present invention provides a wind generator excitation control method and its control device, which are used to solve the problem of large vibration of the electromagnetic torque of the doubly-fed wind generator when the unbalanced grid voltage occurs, and create a good premise for the establishment of a shared mechanism wind farm condition

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