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A fuzzy sliding mode variable structure control method for pwm rectifier when the voltage of the three-phase grid is unbalanced

A sliding mode variable structure, voltage unbalanced technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the constraints of sliding mode variable structure control, difficult to meet requirements, anti-interference Problems such as poor ability, to achieve the effect of easy digital implementation, enhanced robustness and response speed, and stable operation

Inactive Publication Date: 2018-04-03
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its anti-interference ability is poor and its dynamic response is slow. It is difficult to meet the requirements of the field with high requirements for rectification.
The sliding mode variable structure control has the advantages of strong robustness and fast dynamic response, but the chattering problem of variable structure control will cause the stability of the system to deteriorate
The chattering problem has always restricted the development of sliding mode variable structure control

Method used

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  • A fuzzy sliding mode variable structure control method for pwm rectifier when the voltage of the three-phase grid is unbalanced
  • A fuzzy sliding mode variable structure control method for pwm rectifier when the voltage of the three-phase grid is unbalanced
  • A fuzzy sliding mode variable structure control method for pwm rectifier when the voltage of the three-phase grid is unbalanced

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, table and implementation example, the present invention is further elaborated.

[0031] The working principle of the method of the present invention is:

[0032] (1) Sampling the DC side voltage of the voltage-type PWM rectifier VSR, and obtaining the rated active power through the PI controller

[0033] (2) Sampling the three-phase grid voltage and the AC side current of the VSR, and obtain e after Park transformation d 、e q i d i q . Then decompose it into positive and negative sequences to get In order to realize the unit power factor operation of the rectifier and eliminate the second harmonic fluctuation on the DC side, the detected voltage and power are written into the power matrix, and the generalized inverse matrix calculation is performed to obtain the rated current

[0034] (3) The current inner loop adopts fuzzy sliding mode variable structure control. The rated current in step (1) passes through th...

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Abstract

The invention discloses a PWM (Pulse-Width Modulation) rectifier fuzzy sliding mode variable structure control method when the three-phase network voltage is unbalanced, and belongs to the field of power electronics application. The method comprises the following steps of firstly sampling the direct current side voltage of a rectifier; obtaining a rated active power through a PI (Proportional-Integral) controller; sampling the network voltage and the rectifier current, and using a trap filter for performing positive and negative sequence decomposition on the sampling data; listing and writing the power matrix of the rated values by using the rated power conservation principle; obtaining the rated current through a generalized inverse matrix conversion formula; and finally, obtaining a space voltage vector by the fuzzy sliding mode variable structure control method on an electric current loop. The control method has the advantages that the current loop uses the variable structure control, so that the robustness and the dynamic performance of a system can be enhanced; meanwhile, the variable structure coefficient is regulated through fuzzy operation on state points; the adverse influence due to buffeting is reduced; and the stability of the system is improved.

Description

technical field [0001] The invention belongs to the application field of power electronics, and in particular relates to a rectifier, specifically a voltage source PWM rectifier based on fuzzy algorithm and sliding mode variable structure control when the grid voltage is unbalanced. Background technique [0002] With the development of power electronics technology, a PWM rectifier with bidirectional energy flow has appeared to realize bidirectional energy flow. It has the advantages of sinusoidal grid-side current, adjustable power factor, four-quadrant operation, etc., and truly realizes "green power conversion". It has a wide range of applications in many electrical fields. [0003] However, most studies on rectifiers are based on the condition of three-phase grid voltage balance, but the actual grid voltage is not completely balanced. When the grid voltage is unbalanced, the current on the AC side of the rectifier will generate nonlinear harmonics, and the voltage on th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/219
CPCH02M7/219
Inventor 郑宏王哲禹张佳伟朱文
Owner JIANGSU UNIV
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