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

A doubly-fed wind turbine, vector control technology, applied in wind power generation, flexible AC transmission system, single-network parallel feeding arrangement, etc., can solve problems such as power grid voltage drop, impact, and influence on voltage stability

Active Publication Date: 2019-12-13
YANSHAN UNIV
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AI Technical Summary

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

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Embodiment Construction

[0090] The invention discloses a method for reactive power compensation and vector control of a doubly-fed wind power generating set, specifically a method for changing the grid-side converter by analyzing the entire transient process of the doubly-fed wind power generating set from the beginning of the power grid voltage drop to the fault removal The control method, considering the transient characteristics of the stator flux linkage during the voltage drop, the rotor side converter adds the stator flux change item caused by the voltage drop on the basis of the traditional vector control method, and compensates the reactive power demand of the wind farm grid connection point , can stabilize the reactive power fluctuation of the grid-connected point and relieve the reactive power pressure of the grid.

[0091] The STATCOM mentioned in this invention is the English abbreviation of Static Synchronous Compensator, Static Synchronous Compensator, referred to as STATCOM, is the repr...

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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...

Claims

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Application Information

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IPC IPC(8): H02J3/50H02J3/38
CPCH02J3/50Y02E10/76Y02E40/10Y02E40/30
Inventor 殷桂梁王海轮
Owner YANSHAN UNIV
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