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Discrete control method and device for three-phase full-bridge inverter

A three-phase full-bridge, discrete control technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc. Computational volume and software cost, etc., to achieve good steady-state control performance, fast load dynamic control performance, and simple control implementation.

Active Publication Date: 2022-03-04
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

Its disadvantages are: the control system requires a PLL module and a rotating coordinate transformation module, which increases the amount of control calculations and software costs; the control system relies on the PLL module, so it can only achieve constant frequency control, and cannot be used for three-phase inverters that require frequency adjustment. Application occasions of variable frequency power supply

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  • Discrete control method and device for three-phase full-bridge inverter
  • Discrete control method and device for three-phase full-bridge inverter
  • Discrete control method and device for three-phase full-bridge inverter

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Embodiment Construction

[0057] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0058] Such as figure 1 As shown, a kind of discrete control method and device suitable for a three-phase full-bridge inverter provided by the present invention includes a three-phase full-bridge inverter and a discrete controller, and the discrete controller includes: voltage and current sampling and A / D conversion module, duty cycle calculation module, duty cycle selection module, DPWM and drive module.

[0059] Such as figure 2 As shown, the duty cycle calculation module in the above controller includes: 3s-2s coordinate transformation module, duty cycle D AI (k+1)-D BI (k+1)-D CI (k+1) calculation module, duty cycle D AII (k+1)-D BII (k+1)-D CII (k+1) calculation module, three-phase P H Duty ratio calculation module and three-phase P L Duty cycle calculation module.

[0060] The steps to realize the above-mentioned discrete control met...

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Abstract

The invention belongs to the technical field of three-phase alternating-current power supplies, and particularly relates to a discrete control method and device for a three-phase full-bridge inverter. The method comprises the following steps that according to the three-phase load voltage control requirement, at the starting moment of a switching period, a controller samples input bus capacitor voltage, three-phase load voltage and three-phase load current and calculates to obtain three-phase discrete PH and PL duty ratios; meanwhile, three-phase load voltage is sampled and compared with the preset given three-phase load voltage, a proper duty ratio is selected from the three-phase PH duty ratio and the three-phase PL duty ratio to serve as the effective duty ratio of the phase control pulse in the next switching period, and control over the three-phase load voltage is achieved. The scheme is realized in a static coordinate system, a load current control loop is not needed, a proportional-integral amplifier and a corresponding compensation link are not needed, the control is simple to realize, and the control cost is low.

Description

technical field [0001] The invention belongs to the technical field of three-phase AC power supply, and in particular relates to a discrete control method and device for a three-phase full-bridge inverter. Background technique [0002] Based on the three-phase full-bridge inverter, it has the advantages of low voltage and current stress and high power density, so it is widely used in three-phase uninterruptible power supply for independent single-phase and three-phase load power supply, AC asynchronous motor and permanent magnet synchronous motor AC-DC-communication inverters, power system static var compensation devices, three-phase active power filter devices and other high-power power industrial occasions. These applications require that the three-phase full-bridge inverter power supply has good steady-state performance, fast input and load dynamic performance, and has the function of frequency modulation and voltage regulation. [0003] The control strategy of the three...

Claims

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Application Information

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IPC IPC(8): H02M7/5387
CPCH02M7/53875Y02E40/20Y02B70/10
Inventor 沙金王一帆许建平魏红昊
Owner SOUTHWEST JIAOTONG UNIV
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