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Capacitor voltage balance control method for cascaded H-bridge rectifier

A capacitor voltage, balance control technology, applied in the direction of high-efficiency power electronic conversion, instruments, electrical components, etc., can solve the problem of difficult PI regulator design, can not effectively ensure the DC side capacitor voltage balance, etc., to achieve good voltage equalization ability. Effect

Active Publication Date: 2018-10-09
NANJING INST OF RAILWAY TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the current flowing through each power module of CHBR is the same, multiple power modules are completely controlled by the same current when adjusting the DC side capacitor voltage, so the balance of the DC side capacitor voltage of each power module cannot be effectively guaranteed. Therefore, the DC side capacitor voltage balance of CHBR has always been the focus of research by scholars at home and abroad.
Literature [1] has studied a variety of DC bus voltage control algorithms based on PI regulation, so it is difficult to design the parameters of the PI regulator

Method used

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  • Capacitor voltage balance control method for cascaded H-bridge rectifier
  • Capacitor voltage balance control method for cascaded H-bridge rectifier
  • Capacitor voltage balance control method for cascaded H-bridge rectifier

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Embodiment Construction

[0062] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0063] Such as figure 1 Shown, a kind of H-bridge cascaded rectifier capacitor voltage balance control method of the present invention, concrete process is as follows:

[0064] 1. Establish a mathematical model:

[0065] Such as figure 2 Shown is the main circuit diagram of the H-bridge cascaded rectifier. The single power unit is a single-phase two-level PWM rectifier. The H-bridge cascaded rectifier is formed by connecting multiple power units in series. Such as figure 1 As shown, u s Indicates the grid-side input AC voltage source, and the grid-side input current is i s ; L is the grid-side filter inductor; the numbers of each unit module are 1, 2, 3.....n, and a total of n modules are cascaded; there are 4...

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Abstract

The invention discloses a capacitor voltage balance control method for a cascaded H-bridge rectifier. A DC side capacitor voltage balance control strategy based on PI control is researched on the basis of establishing a mathematical model of the CHBR, a carrier phase-shifting modulation strategy is adopted, a relation between a modulation ratio and an active power is derived theoretically, and a voltage-sharing range of the capacitor voltage balance control is obtained, so that the voltage-sharing capacity is good.

Description

technical field [0001] The invention relates to a capacitor voltage balance control method, in particular to a capacitor voltage balance control method of an H-bridge cascaded rectifier. Background technique [0002] In recent years, the H-bridge cascaded rectifier (cascaded H-bridge rectifier, CHBR) has been successfully used in high-power applications due to its advantages of simple control and easy modularization. By cascading multiple power modules, CHBR can generate more levels to synthesize input voltage, thus greatly reducing voltage and current harmonics. CHBR consists of multiple power modules, which can withstand higher voltages than traditional rectifiers, while each power module withstands lower voltages. Since CHBR adopts a modular design, when a module fails, it can be quickly replaced, thereby significantly improving the reliability of the entire system. [0003] Since the current flowing through each power module of CHBR is the same, multiple power modules ...

Claims

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Application Information

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IPC IPC(8): H02M7/23H02M7/219H02M1/42G06F17/50
CPCG06F30/20H02M1/4233H02M7/219H02M7/23Y02B70/10
Inventor 杨飏
Owner NANJING INST OF RAILWAY TECH
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