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Synchronous wind power generator closed-loop vector control method and system

A technology for synchronous wind power generation and wind turbines, which is applied in vector control systems, motor generator control, control systems, etc. Problems such as under-delivery to achieve the effect of ensuring the output power

Active Publication Date: 2015-08-19
BEIJING ETECHWIN ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the rotor flux vector value ψ in formula (2) f It is treated as a constant, but the actual situation is that when the temperature changes or the influence of manufacturing deviation, this ψ f Values ​​may vary by ±10%
due to ψ f Unstable changes in T e_ref The control accuracy can only reach ±10%
[0007] by P e =T e ×ω e It can be seen that if the inverter implements the electromagnetic torque T e Poor accuracy will lead to generator electromagnetic power P e A large deviation will cause the generator output power to be over- or under-delivered, and the power generation efficiency of the generator will also be greatly reduced

Method used

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  • Synchronous wind power generator closed-loop vector control method and system
  • Synchronous wind power generator closed-loop vector control method and system
  • Synchronous wind power generator closed-loop vector control method and system

Examples

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Embodiment 1

[0037] figure 1 The method flow chart of an embodiment of the closed-loop vector control method for synchronous wind generators provided by the present invention is executed by the generator vector control system integrated in the converter controller of the wind generator set. Such as figure 1 As shown, the synchronous wind generator closed-loop vector control method specifically includes:

[0038] S101, periodically obtain the actual output power P of the wind turbine out , The given output power P of the wind turbine received from the main controller of the wind turbine out_ref .

[0039] Among them, the actual output power P of the wind turbine out It can be obtained by installing the voltage measured by the voltage sensor on the output side of the unit inverter and the current measured by the rectifier through the power calculation formula; it can also be obtained by monitoring the current vector when the generator executes the closed-loop vector control algorithm , ...

Embodiment 2

[0049] image 3 It is a method flowchart of another embodiment of the closed-loop vector control method for synchronous wind generators provided by the present invention. its like figure 1 A specific implementation of the illustrated embodiment. and figure 1 Compared to the shown example, image 3 In the illustrated embodiment, steps S101 and S102 are both refined.

[0050] Specifically, for step S101, this embodiment shows that the actual output power P of the wind power generator in each cycle is obtained out A specific implementation manner of , that is, when the generator executes the closed-loop vector control algorithm, the monitored current vector and voltage vector are obtained through the power calculation formula, and the corresponding steps include S301-S302. The specific steps are as follows:

[0051] S301, periodically collect the three-phase current of the wind turbine, and sequentially perform Clarke transformation and Park transformation on the three-phas...

Embodiment 3

[0114] Figure 4 The method flowchart of another embodiment of the synchronous wind generator closed-loop vector control method provided by the present invention can be regarded as image 3 Yet another specific implementation of the illustrated embodiment. Such as Figure 4 As shown, this embodiment is in image 3 On the basis of the illustrated embodiment, it is further shown that the given quadrature axis current i obtained by q_ref , and the given direct-axis current i obtained in each cycle d_ref Isoparameters generate a given quadrature axis voltage u q_ref , given direct axis voltage u d_ref Methods. that is, if image 3 On the basis of the method steps shown, the following steps are also included:

[0115] S401, according to: ω e = ω m ×n………………………………(9)

[0116] Calculate the electrical angular velocity ω of the wind turbine in each cycle e ; among them, ω m is the mechanical angular velocity of the generator, n is the number of pole pairs of the generator,...

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Abstract

The embodiment of the invention provides a synchronous wind power generator closed-loop vector control method and system. The method includes the following steps of: periodically obtaining the actual output power Pout of a wind power generator and the given output power Pout_ref of the wind power generator; and calculating the quadrature-axis current iq_ref of the wind power generator in each period according to the actual output power Pout and the given output power Pout_ref of the wind power generato, and adopting the quadrature-axis current iq_ref as the given value of quadrature-axis current iqs of a d-q coordinate system based on rotor field orientation. With the synchronous wind power generator closed-loop vector control method and system of the technical schemes of the invention adopted, reasonable vector closed-loop control on a wind turbine in operation can be realized, and therefore, the stable output power of the wind power generator can be ensured.

Description

technical field [0001] The invention relates to the technical field of wind power, in particular to a closed-loop vector control method and system for a synchronous wind power generator. Background technique [0002] In the traditional permanent magnet synchronous generator (referred to as "generator") vector control algorithm, the electromagnetic torque T e The calculation of adopts the open-loop control method, that is, according to the formula: [0003] T e =1.5p n (ψ f i q +(L d -L q )i d i q )…………………………(1) [0004] calculated. Because in the high-power permanent magnet synchronous generator L d -L q ≈0, the formula (1) is approximately transformed into the formula: [0005] T e =1.5p n ψ f i q ………………………………………(2) [0006] In actual control, due to the electromagnetic torque T e It cannot be directly observed and measured, and the common method is to set the given electromagnetic torque T e_ref Calculate the quadrature axis current i that the system ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/30H02P21/00
Inventor 刘世军高瑞兰斌杨志千吕梁年
Owner BEIJING ETECHWIN ELECTRIC
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