Separate symmetrical half-wave circuit based current control method

A current-controlled, symmetrical technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problems of cumbersome symbol operation, complex zero-crossing point, accuracy affecting system control results and performance indicators, etc., to simplify the complexity. , The effect of simplifying the harmonic compensation algorithm and saving operation time

Inactive Publication Date: 2008-07-16
LIEBERT
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] Due to the use of three-phase independent control, it is necessary to judge the positive and negative half cycles in the entire power frequency cycle, especially the positive and negative half cycle judgments of each power frequency cycle, and the judgment of the zero crossing point is more complicated, and its accuracy directly affects the system. Control results and performance indicators; at the same time, cumbersome symbolic operations must be performed

Method used

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  • Separate symmetrical half-wave circuit based current control method
  • Separate symmetrical half-wave circuit based current control method
  • Separate symmetrical half-wave circuit based current control method

Examples

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Embodiment Construction

[0023] In this embodiment, an uninterruptible power supply (UPS) using a VIENNA-like rectifier circuit is taken as an example for illustration. refer to figure 2 As shown, UPS mainly includes VIENNA-like main circuit, IGBT drive circuit, detection board (or detection circuit) and digital signal processor (DSP). The voltage loop and current loop PI regulator used for control are implemented by DSP through executing programs. The VIENNA-like main circuit converts the input AC power into DC power under the control of the power drive signal output by the IGBT drive circuit and outputs it through the DC bus. The detection board obtains the voltage and current signals from the DC bus in the main circuit and feeds them back to the DSP, and the DSP performs the relevant PI regulator operation and outputs the pulse width modulation signal (PWM), which is used to control the IGBT circuit to generate power drive signal.

[0024] Because the positive and negative bridge arms of the VI...

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Abstract

The present invention discloses one kind of current control method based on independent symmetric half-wave circuit, and the independent symmetric half-wave circuit complete AC / DC conversion under the control of voltage loop and current loop PI regulation output realized by means of microprocessor execution program. The current control method includes: converting the voltage output into fundamental wave component of target current; phase-locking regulating the sampled triphase input voltage and calculating the fundamental wave phase angles of different phases and the phase angle components; calculating the instantaneous fundamental wave current; taking the absolute values of sampled instantaneous triphase input current as the feedback component for current loop control; calculating the difference between the instantaneous target component and feedback component, performing PI regulating operation of the difference to obtain control amount for the independent symmetric half-wave circuit.

Description

technical field [0001] The invention relates to rectification control technology, in particular to a current control method based on an independent symmetrical half-wave circuit. Background technique [0002] The main rectifier of the traditional three-phase UPS mostly adopts a three-phase full-bridge topology, and the battery connection methods are also various. From the perspective of cost, the rectifier part is very sensitive to the number of insulated gate bipolar transistor (IGBT) modules and the inductance capacity. Therefore, it is a new attempt to use a VIENNA-like circuit as a UPS rectifier, because the VIENNA-like circuit itself has many advantages. It can share the IGBT of the PFC part of the main rectifier with the IGBT of the PFC part of the battery. The circuit diagram is as follows figure 1 shown. [0003] From figure 1 It can be seen that the entire PFC circuit powered by the battery can borrow the PFC circuit powered by the main road, which not only save...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12
Inventor 王超刘平
Owner LIEBERT
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