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Brushless doubly-fed induction generator efficiency optimization control method and system

A technology of generator efficiency and optimal control, applied in motor generator control, generator control circuit, control system, etc., can solve the problem of low efficiency of brushless doubly-fed induction generator, and achieve efficiency improvement, efficiency maximization, Reasonable distribution of the effect of improvement

Active Publication Date: 2021-07-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defects and improvement needs of the prior art, the present invention provides a brushless doubly-fed induction generator efficiency optimization control method and system, the purpose of which is to effectively solve the technical problem of low efficiency of the brushless doubly-fed induction generator

Method used

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  • Brushless doubly-fed induction generator efficiency optimization control method and system
  • Brushless doubly-fed induction generator efficiency optimization control method and system
  • Brushless doubly-fed induction generator efficiency optimization control method and system

Examples

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Embodiment 1

[0058] A brushless doubly-fed induction generator efficiency optimization control method, such as figure 1 shown, including the following steps:

[0059] (1) In the current control cycle, according to the feedback value U of the power winding voltage amplitude p Calculate the output power P of the motor with the resistive load value R out , according to the DC bus voltage U dc and DC bus current I dc Calculate the DC input power P of the motor dc , and obtain the rotor angular velocity ω of the brushless doubly-fed induction generator r and electromagnetic torque T em , to calculate the mechanical power P converted to the input electromagnetic power em , so as to calculate the motor efficiency of the current control cycle as η=P out / (P em +P dc );

[0060] In this example, the output power P out The calculation formula is: DC input power P dc The calculation formula is: P dc =U dc I dc ;

[0061] In an optional embodiment, in step (1), the rotor angular velo...

Embodiment 2

[0085] Provides a brushless doubly-fed induction generator efficiency optimization control system, such as figure 2 As shown, including: power winding frequency controller, power winding voltage calculator, power winding voltage regulator and control winding voltage controller;

[0086] The power winding frequency controller includes: efficiency calculation module, frequency iteration module and control module;

[0087] The efficiency calculation module is used to feed back the value U according to the voltage amplitude of the power winding in the current control cycle p Calculate the output power P of the motor with the resistive load value R out , according to the DC bus voltage U dc and DC bus current I dc Calculate the DC input power P of the motor dc , and obtain the rotor angular velocity ω of the brushless doubly-fed induction generator r and electromagnetic torque T em , to calculate the mechanical power P converted to the input electromagnetic power em , so as...

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Abstract

The invention discloses a brushless doubly-fed induction generator efficiency optimization control method and system, and belongs to the technical field of brushless doubly-fed induction generator control. The method comprises the steps of (1) in a current control period, calculating output power according to a power winding voltage amplitude feedback value and a resistive load value, calculating direct-current input power according to the direct-current bus voltage and the direct-current bus current, and calculating mechanical power converted into input electromagnetic power according to the rotor angular speed and the electromagnetic torque so as to calculate motor efficiency eta of the current control period; (2) if eta is greater than the current optimal motor efficiency, updating the optimal power generation efficiency to eta, updating the optimal power generation frequency to the current power generation frequency f, and then updating a control winding angular frequency given value; and (3) after the power generation frequency is increased by delta f, if the power generation frequency does not exceed the upper limit of the power generation frequency, turning to the step (1) to start efficiency optimization of the next control period, and otherwise, enabling the generator to operate according to the sequence, and ending the optimization control. According to the invention, the motor efficiency can be maximized.

Description

technical field [0001] The invention belongs to the technical field of brushless doubly-fed induction generator control, and more specifically relates to an efficiency optimization control method and system for a doubly-fed induction generator without double-feed. Background technique [0002] Brushless double-fed induction generator (Brushless doubly-fed induction generator, BDFIG), as a new type of AC induction motor, cancels the brushes and slip rings. Compared with the brushless doubly-fed induction generator, not only the operation reliability Significantly improved, and basically maintenance-free, has a good application prospect. [0003] The brushless doubly-fed induction generator contains two sets of stator windings with different pole pairs, which are called power windings (Power Windings, PW) and control windings (Control Windings, CW). The rotor windings are specially designed to make the power windings and The rotating magnetic fields generated by the control w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P21/14H02P21/18H02P21/22
CPCH02P9/007H02P21/14H02P21/18H02P21/22Y02E10/76
Inventor 徐伟张杨生刘毅
Owner HUAZHONG UNIV OF SCI & TECH
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