Multi-level power circuit control method and device

A power circuit and multi-level technology, applied in the electronic field, can solve problems such as increased switching loss and increased switching frequency of high-power devices, and achieve the effects of reducing operating frequency, optimizing voltage output, and avoiding frequent actions

Active Publication Date: 2011-05-18
CHINA RAILWAY CONSTR ELECTRIFICATION BUREAUGRP +1
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Problems solved by technology

However, the traditional method has high-frequency jitter, which increases the switching frequency of high-power devices and increases switching losses, so it is limited in high-power voltage control, especially in voltage control, and no related patents have appeared

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  • Multi-level power circuit control method and device

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] In order to solve the problems existing in the prior art, the present invention proposes a multi-level power circuit control method and device. The control method is especially suitable for series-type high-power power circuits, which eliminates the phenomenon of high-frequency jitter and can not only satisfy the output The voltage quality requirements can also be changed to further reduce the loss by changing the number of input power units, which has s...

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Abstract

The invention discloses a multi-level power circuit control method and device. The method comprises the steps of: A, structuring a switching function s=kx1+x2 by a controller on the basis of a load-side voltage in a power circuit; B, carrying out buffer control on the switching function s by the controller; C, obtaining a switching inequation by the controller by using the switching function s subjected to the buffer control and a convergence condition of a control system, and carrying out logic judgment on the basis of the switching inequation to obtain the control law of a switching function ux; and D, determining the number of working power units in the power circuit by the controller on the basis of the position of a differential value between the voltage us of a power grid connected with the power circuit and an ideal power grid voltage d, in the control law of the ux. The device comprises a function structuring module, a buffer control module, a logic judgment module and a circuit control module. The method and the device, provided by the invention, not only can lower the switching frequency of the power circuit but also can optimize output waveforms.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a multilevel power circuit control method and device. Background technique [0002] The multi-level circuit is characterized by high power and no harmonics. The more common one is the series power unit circuit. The number of levels is 2n+1 by using n power units in series. The harmonic content of the output voltage increases with the increase of n. decrease. In the case of high voltage and high power, more power units can be connected in series to meet the demand of large capacity. The control of this high-power circuit is essentially the physical realization of the control algorithm, which is divided into two aspects: first, the control pulse generation and distribution of the switching devices of the power circuit itself; second, the control object and the control strategy algorithm. The traditional PI control uses the error between the controlled object and the reference...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/49
Inventor 郑斌寇宗乾李学斌杨加生赵兴东白莉乔建敏
Owner CHINA RAILWAY CONSTR ELECTRIFICATION BUREAUGRP
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