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Three-level boost circuit control method and system

A circuit control, three-level technology, applied in the direction of control/regulation system, electrical components, regulating electrical variables, etc., can solve the problems of increasing the complexity and difficulty of the system, affecting the control accuracy of the system, and achieving less difficulty in setting and control. The frame structure is simple and the effect of optimizing the positive definite process

Active Publication Date: 2020-12-08
CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the stability of the control method of the three-level Boost circuit depends on the setting of the PI adjustment parameters of the three control loops. The coordination of parameters increases the complexity and difficulty of the system

Method used

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  • Three-level boost circuit control method and system
  • Three-level boost circuit control method and system
  • Three-level boost circuit control method and system

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Embodiment Construction

[0041] Specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0042] The embodiment of the present invention provides a three-level Boost circuit control method, the specific method is:

[0043] (1) Reference Figure 2-3 As shown, the three-level Boost circuit is equivalent to two independent two-level Boost circuits connected in series. The specific analysis is as follows:

[0044] When the input voltage U of the three-level Boost circuit in with output voltage U o meet u in >(U o / 2), the working process of the switching tube in one cycle of the three-level Boost circuit is as follows figure 2 shown. The three-level Boost working state in one cycle can be divided into four transient states:

[0045] ① if figure 2 As shown in (a), the switch tube Q1 is turned on and Q2 is turned off. At this time, the output capacitor C1 discharges to the load, the output capacitor C2 stores energy, and the boo...

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Abstract

The invention relates to a three-level Boost circuit control method and system. The method comprises the steps that a three-level Boost circuit is equivalent to two independent two-level Boost circuitseries connection modes; and two sets of same voltage outer loop and current inner loop cascade control modes are adopted to respectively control each two-level Boost circuit. Compared with an existing three-loop control mode of a voltage loop, a current loop and a grading ring, the method provided by the invention has the advantages that the three-level Boost circuit is controlled by using a double-loop control method; according to the method, on the basis of not increasing circuit hardware, the grading ring is omitted, and only PI adjustment parameters of the voltage loop and the current loop are set; the PI adjustment parameter positive definite process is optimized; the PI adjustment parameter setting difficulty is small; and the control frame structure is simpler, and the control stability is higher. According to the three-level Boost circuit control method, a corresponding control system is further designed to control the three-level Boost circuit.

Description

technical field [0001] The invention belongs to the technical field of Boost chopper circuit control, and in particular relates to a three-level Boost circuit control method and system. Background technique [0002] The existing three-level Boost circuit control technology is mainly based on the dual-loop control of the voltage outer loop and the current inner loop. In order to achieve the potential balance of the midpoint of the output capacitor on the DC side, a voltage equalizing loop is added to the control, and the output of the voltage equalizing loop is superimposed on the cascaded On the output of the voltage loop and current loop, the pulse width is finally output through the PWM generator to control the action of the switching device. At the same time, the phase difference of the pulse action of the three-level switching tube is 180 degrees, so as to achieve the purpose of reducing the capacitor ripple on the DC side. The schematic diagram of the control method is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/158
Inventor 何俊鹏刘皓郝帅张润泽曹虎杨培盛
Owner CRRC QINGDAO SIFANG ROLLING STOCK RES INST
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