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Capacitor voltage balance control method and system for five-level Buck/Boost converter

A capacitor voltage and balance control technology, which is applied in the direction of control/regulation system, load balance in DC network, and regulation of electric variables, etc., can solve problems such as difficult and complicated capacitor voltage control, and achieve effective implementation, strong adaptability, and control The effect of simple process

Active Publication Date: 2021-06-18
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Capacitor voltage control in this case is more difficult and complicated, therefore, how to achieve reliable balance of capacitor voltage in five-level Buck / Boost converter is a concern of those skilled in the art

Method used

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  • Capacitor voltage balance control method and system for five-level Buck/Boost converter
  • Capacitor voltage balance control method and system for five-level Buck/Boost converter
  • Capacitor voltage balance control method and system for five-level Buck/Boost converter

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0045] In the present invention, the terms "first", "second" and the like (if any) in the present invention and drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0046] figure 1 A flow chart of a capacitor voltage balance control method (hereinafter referred to as a control method) of a five-level Buck / Boost converter prov...

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Abstract

The invention discloses a capacitor voltage balance control method and system for a five-level Buck / Boost converter, and belongs to the field of direct current-direct current conversion, and the method comprises the steps that the voltage at the two ends of each capacitor is collected, and the current iL flowing is collected through an inductor; based on vo, iL and an output voltage given values, a duty ratio D of a switching tube is calculated by using a double-ring PI controller, based on vc1, vc2, vc3, vc4 and an input voltage vi, a proportional controller is used to calculate phase shift ratios corresponding to S1, S2 and S7 respectively, and based on D and a switching period Ts, PWM signals G1, G2, G7 and G8 are generated respectively, PWM signals G4, G3, G6 and G5 complementary with G1, G2, G7 and G8 are generated respectively, and the switching tubes are driven by using the PWM signals corresponding to the switching tubes, so that the capacitor voltage balance is controlled. Complex control is not needed, the stability can be kept in a full-load range, the dynamic performance is not affected by inductive current, and the method is particularly suitable for scenes with loads changing in a wide range and can be popularized to higher-level converters conveniently.

Description

technical field [0001] The invention belongs to the field of DC-DC conversion, and more specifically relates to a capacitor voltage balance control method and system for a five-level Buck / Boost converter. Background technique [0002] Bidirectional Buck / Boost converters have been widely used in industrial production. In order to cope with the gradually increasing voltage level, the multi-level Buck / Boost structure that can improve the efficiency of the converter, reduce the withstand voltage level of the switching tube, and reduce the cost of equipment is gradually being accepted. favored by those skilled in the art. There are various topologies for multilevel converters, among which, a flying capacitor type multilevel structure is often used in the field of Buck / Boost converters. However, when using the flying capacitor type multilevel structure, the balance of the capacitor voltage must be ensured, so that the voltage stress of the switching device is uniform, and the adv...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M1/32H02J1/14
CPCH02M3/156H02M1/32H02J1/14
Inventor 张宇赵璇琦
Owner HUAZHONG UNIV OF SCI & TECH
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