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Model predictive direct power control method based on fuzzy control

A technology of model prediction and power control, applied in the field of electric drive, which can solve problems such as the inability to realize decoupling control

Active Publication Date: 2018-10-09
SOUTHEAST UNIV
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Problems solved by technology

However, when the active and reactive power changes greatly, in the case of a single objective function, the active and reactive power are coupled with each other and affect each other, so decoupling control cannot be realized

Method used

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  • Model predictive direct power control method based on fuzzy control
  • Model predictive direct power control method based on fuzzy control
  • Model predictive direct power control method based on fuzzy control

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Embodiment Construction

[0062] The technical solution of the present invention will be further introduced below in combination with specific embodiments.

[0063] This specific embodiment discloses a model predictive direct power control method based on fuzzy control, including the following steps:

[0064] S1: collect the symmetrical three-phase current i of the three-phase voltage-type PWM rectifier a i b i c , DC bus voltage U dc and load current i L ;

[0065] S2: DC bus voltage U dc with a given DC bus voltage U ref The difference is output by the PI regulator, the output value and the DC bus voltage U dc The product of the given active power p ref ;Given reactive power q ref = 0;

[0066] S3: According to the symmetrical three-phase current i a i b i c and the six switching tube states of the three-phase voltage-type PWM rectifier to obtain the virtual flux linkage ψ, active power p, reactive power q and the component e of the grid voltage in the αβ coordinate system α and e β ; ...

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Abstract

The invention discloses a model predictive direct power control method based on fuzzy control. According to the method, the error of active power and reactive power is used as the input of a fuzzy controller, a corresponding output is obtained through a fuzzy control rule, and a new objective function is thus constructed; the influence of a non-zero voltage vector and a zero voltage vector on therate of changes of the active and reactive power is analyzed according to a discretization prediction model of a system, the magnitudes of the active and reactive power are predicted under different voltage vector combinations, and an appropriate voltage vector combination is selected according to the principle that the objective function is minimum; and six switching tubes are driven to act by apulse width modulation technology so as to control the active and reactive power to follow given values thereof. The method saves the cost, improves the reliability of the system, reduces the distortion rate of current harmonics by compensating the active and reactive power, and can achieve floating active and reactive power by using predictive power control.

Description

technical field [0001] The invention relates to electric transmission technology, in particular to a fuzzy control-based model prediction direct power control method. Background technique [0002] At present, with the development of power electronics technology and the continuous improvement of the performance of semiconductor switching devices, the three-phase PWM rectifier has developed from uncontrolled rectification to controlled rectification. The PWM rectifier uses fully controlled devices instead of diodes or thyristors, the power factor is adjustable, and energy can flow in both directions, realizing the real "green power conversion". [0003] For the control of the three-phase PWM rectifier, domestic and foreign scholars have proposed many efficient control methods. Among them, the direct power control strategy has received great attention from scholars at home and abroad because of its simple structure, algorithm, and fast dynamic response. The direct power contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219H02J3/18
CPCH02J3/18H02M7/219H02M7/2195Y02E40/30
Inventor 林明耀李晖
Owner SOUTHEAST UNIV
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