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Sliding-mode control method suitable for nine-switch converter

A technology of nine switching converters and control methods, which is applied in the direction of converting AC power input into DC power output, output power conversion devices, electrical components, etc., and can solve problems such as modulation conflicts

Active Publication Date: 2014-08-27
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a sliding mode control method suitable for nine-switch converters, to solve the problem of modulation conflicts generated during the modulation process, and to enable the currents of two sets of three-phase outputs of nine-switch converters to directly track the command value ; Compared with the voltage-type modulation strategy, the modulation strategy proposed by the present invention can simplify the modulation process and improve the ability of the output current tracking command

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  • Sliding-mode control method suitable for nine-switch converter
  • Sliding-mode control method suitable for nine-switch converter
  • Sliding-mode control method suitable for nine-switch converter

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Embodiment Construction

[0030] The sliding mode control method applicable to nine switching converters provided by the present invention comprises the following steps:

[0031] Step1: Determine the working mode of the nine-switch converter based on the application requirements, and calculate the minimum DC voltage required for the normal operation of the nine-switch converter: the nine-switch converter works in different frequency operation mode (that is, the nine-switch converter generates two sets of When the three-phase AC output), the DC voltage is calculated according to (Formula 1); when the nine-switch converter works in the same frequency operation mode (that is, the nine-switch converter produces two sets of three-phase AC outputs with the same frequency), the DC voltage is calculated according to (Formula 2) is calculated. Through calculation, the minimum DC bus voltage V required for the normal operation of the nine switching converters can be obtained dc-min ;

[0032] V dc-min =V 1 +...

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Abstract

The invention provides a sliding-mode control method suitable for a nine-switch converter. Output current and midpoint voltage to earth are sampled, a sliding mode surface is obtained through operation on voltage and current sampled signals and corresponding instruction values and then sent into a sliding-mode control system, corresponding drive signals are provided according to the sliding-mode track state for controlling nine switching tube switches, the sliding-mode track is enabled to converge on the sliding mode surface, and finally two groups of three-phase sinusoidal current output by the nine-switch converter can be directly tracked and provided. According to the method, the output current is taken as a controlled object, the control method is more simple compared with voltage type modulation strategies such as pulse width modulation (PWM) and space vector pulse width modulation (SVPWM), the steady accuracy is high, and the dynamic response is rapid.

Description

technical field [0001] The invention belongs to the control technology of a nine-switch converter, and in particular relates to a sliding mode control method suitable for a nine-switch converter. Background technique [0002] In many industrial applications such as electric or hybrid vehicles, ship power plants, high-speed rail, UPS, wind power generation systems, etc., the converter needs to be connected to multiple three-phase systems at the same time. Equipped with a separate converter; this will increase the size and development cost of the complete device. In order to reduce the development cost and reduce the size of the device, a converter using nine switching devices to connect two three-phase systems is proposed. Its topology is as follows figure 1 shown. [0003] Nine-Switch Inverter [See K.Oka, Y.Nozawa, R.Omata, K.Suzuki, A.Furuya, and K.Matsuki. Characteristic comparison between Five-Leg Inverter and Nine-Switch Inverter. PCC'07, pp. 279-283, June 2007.] by n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5395
Inventor 陈宇文刚康勇
Owner HUAZHONG UNIV OF SCI & TECH
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