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Control method and device for pwm rectifier based on extended state observer

An expansion state observation and expansion state technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve problems such as bus voltage fluctuation and grid side voltage distortion

Active Publication Date: 2020-10-27
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] In view of this, the purpose of the present invention is to propose a PWM rectifier control method and device that can solve the problems of grid side voltage distortion and bus voltage fluctuation caused by parameter perturbation and external interference in PWM rectifier current predictive control

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  • Control method and device for pwm rectifier based on extended state observer
  • Control method and device for pwm rectifier based on extended state observer
  • Control method and device for pwm rectifier based on extended state observer

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Embodiment Construction

[0072] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0073] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0074] In one aspect, the present invention provides a method for controlling a PWM rectifier based on an extended state observer.

[0075] Such as figure 1 , shown in 2, in an embodiment of a PWM rectifier control method based on an extended state observer provided ...

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Abstract

A PWM rectifier control method and device based on extended state observer are disclosed, which relates to the technical field of power electronics; The problem of voltage distortion and bus voltage fluctuation caused by parameter perturbation and external disturbance can be solved well. The PWM rectifier control method based on the extended state observer comprises the following steps: obtaininga model-free control current reference value based on the extended state observer; calculating a voltage prediction value of the converter side according to the expanded state observer equation of thePWM rectifier and the current reference value; calculating a drive pulse for driving the power transistor by using the predicted converter-side voltage. The PWM rectifier control device based on theextended state observer comprises a current reference value module; a voltage prediction module; a driving pulse module.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a PWM rectifier control method and device based on an extended state observer. Background technique [0002] The Pulse Width Modulation (PWM) rectifier has the characteristics of bidirectional flow of energy, adjustable power factor, sinusoidal current on the grid side and adjustable bus voltage, and has been widely used. However, in practical applications, PWM rectifiers will encounter parameter perturbations and external disturbances. Parameter perturbation is mainly due to changes in parameters caused by changes in ambient temperature. When the parameters change, the control performance of the system will decrease, manifested as grid-side current distortion, harmonic increase, power factor decrease, and serious system instability. External disturbances usually appear as unbalanced grids or harmonics in the grid. When the grid voltage is disturbed, the grid-side cu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 张永昌李冰玉刘杰
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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