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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Problems solved by technology

Capacitor voltage control in this case is more difficult and complicated, therefore, how to achieve reliab

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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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[0044] In order to make the objectives, technical solutions and advantages of the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely intended to illustrate the invention and are not intended to limit the invention. Further, the technical features according to each of the various embodiments described below can be combined with each other as long as they do not constitute a collision between each other.

[0045] In the present invention, the terms "first", "second", or the like (if present), and the like in the drawings are used to distinguish the similar object without having to describe a particular order or ahead order.

[0046] figure 1 A flow chart of a capacitance voltage balancing control method (hereinafter referred to as a control method) provided for the embodiment of the present invention. See figure ...

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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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