PWM rectifier direct power control method with sliding mode variable structure

A technology of sliding mode variable structure and power control, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., which can solve the problems of severe grid harmonics and low power factor of the grid, and achieve the elimination of Effects of rectifier harmonics, reduction of instantaneous power error, and improvement of transient response performance

Inactive Publication Date: 2017-06-20
韩会义
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AI Technical Summary

Problems solved by technology

The traditional control method of the three-phase voltage-type PWM rectifier is generally to control the voltage or current, but the power factor of the grid obtained by the inverter using this control algorithm is low, and the grid harmonics are serious.

Method used

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  • PWM rectifier direct power control method with sliding mode variable structure
  • PWM rectifier direct power control method with sliding mode variable structure

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Embodiment Construction

[0015] specific implementation plan

[0016] figure 1 In the main circuit of the three-phase PWM rectifier, the power supply is connected to the bridge rectifier circuit composed of six IGBTs after passing through the line impedance and , and then the filter capacitor and the load are connected in parallel.

[0017] figure 2 Among them, the DPC-SMC control system of the PWM rectifier is composed of four parts: power calculation, voltage and current sampling, sliding mode control and SVPWM generation. Sliding mode variable structure control The core of sliding mode variable structure control lies in the design of the switching function. According to the pre-designed sliding mode, the corresponding control function is obtained, so that the control system reaches a stable state. The driving signal obtained by the sliding mode controller and the SVPWM module makes the input voltage obtained by the PWM rectifier a relatively standard sinusoidal waveform, so it has a good control...

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Abstract

A sliding mode variable structure direct power control method for a PWM rectifier discloses a sliding mode variable structure direct power control method for a PWM rectifier, including three parts: a three-phase PWM rectifier circuit, a direct power control, and a sliding mode variable structure control. Using the method proposed by the present invention to control the PWM rectifier can not only eliminate the disadvantages of the rectifier harmonics caused by the unfixed switching frequency in the direct power control of the traditional table look-up method, but also reduce the rotation coordinate transformation under the current closed-loop control method The instantaneous power error caused by the time improves the transient response performance of the system. At the same time, the control method has good robustness and static and dynamic performance.

Description

[0001] Technical field [0002] The invention relates to a PWM rectifier, in particular to a sliding mode variable structure PWM rectifier direct power control method. Background technique [0003] The three-phase voltage type PWM rectifier has the advantages of high power factor, simple structure, good controllability, and can realize bidirectional flow of energy, etc., and is widely used in wind power generation, grid-connected power generation and other fields. With the development of power electronics technology, the research on PWM rectifier control mode is gradually deepening. The traditional control method of the three-phase voltage-type PWM rectifier is generally to control the voltage or current, but the power factor of the grid obtained by the inverter using this control algorithm is low, and the grid harmonics are serious. According to the instantaneous representation method of active and reactive power, the power control strategy is applied to the three-phase PWM ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/219
CPCH02M7/219
Inventor 韩会义
Owner 韩会义
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