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Low-voltage traversing control method for double-fed wind power generation system

A wind power generation system and control method technology, applied in wind power generation, control systems, control generators, etc., can solve problems such as unfavorable power system stability, loss of controllability of doubly-fed generators, etc. Low-voltage ride-through effect, effect of suppressing oscillation

Active Publication Date: 2011-05-11
TSINGHUA UNIV
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  • Claims
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Problems solved by technology

This control method is suitable for serious grid faults, but the connection of crowbar will make the doubly-fed generator lose controllability, and need to absorb a large amount of reactive power from the grid, which is not conducive to the stability of the power system

Method used

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  • Low-voltage traversing control method for double-fed wind power generation system
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  • Low-voltage traversing control method for double-fed wind power generation system

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Embodiment Construction

[0033] The low-voltage ride-through control method for doubly-fed wind power generation system proposed by the present invention, its principle block diagram is as follows figure 2 shown, including the following steps:

[0034] (1) Obtain the number of pole pairs n of the doubly-fed generator in the doubly-fed wind power generation system p , Stator inductance L s , stator and rotor mutual inductance L m , rotor resistance R r and rotor inductance L r , these parameters are usually provided by the doubly-fed generator manufacturer, and can also be measured through open-circuit experiments;

[0035] (2) Use the current sensor to measure the stator current i of the doubly-fed generator sa , i sb , i sc and rotor current i ra , i rb , i rc ;

[0036] (3) Use the phase-locked loop method to obtain the angular frequency ω of the stator voltage of the doubly-fed generator s ;

[0037] (4) Measuring the rotor mechanical angular frequency ω of the doubly-fed generator wi...

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Abstract

The invention relates to a low-voltage traversing control method for a double-fed wind power generation system, which belongs to the technical field of wind power generation. The method comprises the following steps: firstly, the stator flux and the rotor flux of a double-fed generator are calculated according to the stator current and the rotor current of the double-fed generator which are measured by a current sensor; secondly, the stator flux is multiplied by a corresponding proportionality factor to serve as the set value of the rotor flux of the double-fed generator, so as to control therotor flux; and thirdly, the rotor flux is controlled in the way that as feedforward compensation decoupling is performed, closed-loop control is conducted to the decoupled system, and a rotor-side converter is controlled after pulse-width modulation is conducted to the obtained voltage control quantity of a rotor-side converter, so as to achieve low-voltage traversing control during failures. The low-voltage traversing control method provided by the invention has fast response, and very good traversing effect when symmetrical and asymmetrical drop failures of the network voltage occur, meanwhile, and oscillation of output electromagnetic torque of the double-fed generator can be effectively inhibited. The control method is simple and suitable for engineering application.

Description

technical field [0001] The invention relates to a low-voltage ride-through control method for a doubly-fed wind power generation system, belonging to the technical field of wind power generation. Background technique [0002] The typical topology of the existing doubly-fed wind power generation system, such as figure 1 shown. It is mainly composed of wind turbine, gearbox, doubly-fed generator, voltage source rotor-side converter, voltage source grid-side converter, crowbar protection circuit, detection circuit, and control system. Among them, both the rotor-side converter and the grid-side converter use forced commutation devices (such as IGBT, GTO, etc.), and the two sets of converters share a DC bus capacitor on the DC side. Both ends of the DC bus capacitor can be connected in parallel with a DC bus chopper. When the grid voltage is normal, the decoupling control of active power and reactive power is adopted, and the maximum wind energy capture of the doubly-fed gener...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02P9/10
CPCY02E10/76
Inventor 肖帅杨耕周宏林郑重
Owner TSINGHUA UNIV
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