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Method and device for reducing output voltage harmonic waves of medium-frequency power supply

An intermediate frequency power supply and output voltage technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problems of AC power control static difference, high output voltage harmonics, etc., to achieve strong and low Sub-harmonic suppression ability, the effect of optimized combination

Pending Publication Date: 2022-03-11
PLA OF CHINA AIR FORCE EARLY WARNING ACADEMY LEIDA SERGEANT SCHOOL
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Problems solved by technology

The traditional double-closed-loop PI control has been widely used for its simple structure and easy implementation, but it can be seen from the internal model principle that this control method has static error in AC power control.
Especially under nonlinear load conditions, existing control methods have the problem of excessive output voltage harmonics

Method used

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  • Method and device for reducing output voltage harmonic waves of medium-frequency power supply
  • Method and device for reducing output voltage harmonic waves of medium-frequency power supply
  • Method and device for reducing output voltage harmonic waves of medium-frequency power supply

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Embodiment Construction

[0042] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

[0043] In order to facilitate the understanding of the embodiments of the present invention, the following will take several specific embodiments as examples for further explanation and description in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present invention.

[0044] like figure 1 As shown, the method for reducing the output voltage harmonics of a single-phase intermediate frequency power supply according to ...

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Abstract

The embodiment of the invention provides a method and a device for reducing output voltage harmonics of a single-phase intermediate-frequency power supply. The method comprises the following steps: step 1, establishing a discrete state space mathematical model of a single-phase intermediate-frequency power supply; 2, generating an inner loop discrete sliding mode current controller of the single-phase intermediate-frequency power supply; 3, respectively solving discrete state space expressions of a fundamental wave servo controller, a third harmonic servo controller and a fifth harmonic servo controller of the single-phase medium-frequency power supply; 4, generating a discrete state space expression of the augmented system, and obtaining a linear matrix inequality to be solved according to a time domain robust control theory; 5, configuring all poles of the augmented system in a specified robust region, and solving a linear matrix inequality condition meeting the property; 6, solving an optimal control solution taking the linear matrix inequality as a constraint condition, and judging whether an optimal solution is generated or not; and if the robust region range is not generated, modifying the robust region range, and jumping to the step 5 until the optimal solution is solved.

Description

technical field [0001] The invention relates to the field of electrical equipment, in particular to a method and a device for reducing output voltage harmonics of an intermediate frequency power supply. Background technique [0002] With the development of society and the advancement of technology, a large number of electrical equipment with nonlinear loads have been put into use, and there are more and more devices that generate low-frequency harmonics. These harmonics will not only distort the output voltage of the power supply, but also reduce the power quality. , and the harmonic loss will lead to the decrease of the efficiency of the whole machine, the heating of the output transformer, and the increase of the conducted EMI interference. [0003] The basic control objectives of inverter power supply are zero-error tracking reference signal, fast dynamic response, strong robust performance and low output voltage THD. Around this control objective, various control techniq...

Claims

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Application Information

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IPC IPC(8): H02M1/12H02M7/5387
CPCH02M1/126H02M7/53871
Inventor 张银峰邵英冯德玉孙军高洪波徐晓剑
Owner PLA OF CHINA AIR FORCE EARLY WARNING ACADEMY LEIDA SERGEANT SCHOOL
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