Reactive compensation and vector control method for doubly-fed wind turbine generator

Abstract

The invention relates to a reactive compensation and vector control method for a doubly-fed wind turbine generator, and belongs to the technical field of operation and control of doubly-fed wind turbine generators in new energy power generation. In order to avoid off-grid operation of the doubly-fed wind turbine generator caused by voltage drop of a power grid, the output reactive power of a gridside is adjusted in a reactive power compensation mode by changing a grid side converter control method on the one hand; and on the other hand, in consideration of transient characteristics of a stator flux linkage during a voltage drop period, a rotor side converter adds a stator flux linkage change item caused by the voltage drop on the basis of the traditional vector control method, and the DCside overvoltage and the rotor side overcurrent are suppressed during the voltage drop period and after the fault is removed so as to help the recovery of the system voltage. For research of a grid-side and rotor-side converter cooperative control method, off-grid operation of the doubly-fed wind turbine generator caused by the voltage drop of the power grid can be effectively avoided, the systemfault voltage is helped to be recovered, and the stability of the power grid is maintained.

Description

technical field [0001] The invention relates to the technical field of operation and control of doubly-fed wind power generating sets in new energy power generation, and specifically relates to the fact that the generating set can provide a certain reactive power to the system when the grid voltage drops, so as to speed up the recovery of fault voltage and improve the low-voltage ride-through of the generating set A reactive power compensation and vector control method for doubly-fed wind turbines. Background technique [0002] In recent years, renewable energy power generation has been vigorously promoted. Wind power is one of the main clean energy sources. The scale of wind power system construction is expanding day by day. In addition to increasing the total installed capacity of the power system, its operating status has a great influence on the power balance and voltage when the grid voltage drops instantaneously. The stabilizing effect is also growing. The harsh natur...

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Problems solved by technology

The natural environment in which most electrical equipment is located is harsh, which can easily lead to voltage drops

Relevant data shows that more than 60% of the voltage drop is related to harsh environments (such as strong winds, heavy rain, heavy snowfall, etc.); the abnormal operation of various electrical equipment in the power system will cause the voltage to drop, such as a transmission line in the distribution network When a ground short circuit occurs, it will have a great impact on the user load at the remote power receiving end, which cannot meet the reliability requirements of its power supply; in addition, when some large-capacity equipment (such as large motors, transformers, etc.) Serious current distortion will occur, which will affect the voltage stability of the bus connected to the load, and the grid voltage drop will occur

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