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Hybrid multi-level converter control method based on open-loop common-mode voltage injection

A multi-level converter, common mode voltage technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the large voltage fluctuations of DC bus side capacitors and flying capacitors and other problems, to achieve the effect of suppressing capacitor voltage fluctuations, reducing complexity and cost, and enhancing the ability to operate safely and reliably

Pending Publication Date: 2022-03-25
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention aims to solve the problem of large voltage fluctuations of DC bus side capacitors and flying capacitors in HCC under low frequency conditions. By injecting a triple frequency common-mode voltage with a certain amplitude and phase, it can effectively suppress the DC bus capacitors and the Flying capacitor voltage fluctuations

Method used

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  • Hybrid multi-level converter control method based on open-loop common-mode voltage injection
  • Hybrid multi-level converter control method based on open-loop common-mode voltage injection
  • Hybrid multi-level converter control method based on open-loop common-mode voltage injection

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Such as figure 1 Shown is a schematic diagram of the inverter circuit connection of the three-phase four-level HCC, in which, including the DC power supply V dc , a hybrid multilevel converter (HCC) and a load RL;

[0029] DC power V dc , used to provide DC power supply voltage, the voltage level is between 100V and 15kV;

[0030] The hybrid multilevel converter includes DC bus side capacitor C u 、C m 、C l , the flying capacitor C fn (n=a, b, c) and four bridge arms;

[0031] DC bus terminal capacitance C u 、C m and C l connected in series;

[0032] DC power V dc The positive electrode of the hybrid multilevel converter and the DC bus terminal capacitor C u connected to the anode of V dc The negative electrode of the hybrid multilevel converter and the DC terminal capacitor C l connected to the negative pole and grounded reliably;

[0033] The four bridge arms include four sets of main switches, namely S 1n and S' 1n , S 2n and S' 2n , S 3n and S' 3...

Embodiment 2

[0047] Such as figure 1 Shown is a schematic diagram of the inverter circuit connection of the three-phase four-level HCC, in which, including the DC power supply V dc , a hybrid multilevel converter (HCC) and a load RL;

[0048] DC power V dc , used to provide DC power supply voltage, the voltage is 6kV;

[0049] DC bus side capacitance C u 、C m 、C l and flying capacitor C fn The capacitance value is 0.1mF;

[0050] The three-phase load consists of three series connected resistors and inductors. The resistance of the load RL resistor is 10Ω, and the inductance is 5mH;

[0051] The HCC system modulation ratio is set to 0.6, and the working frequency is 5Hz;

[0052] The HCC capacitor voltage fluctuation control method based on open-loop common-mode voltage injection in this embodiment is as follows: figure 2 As shown, the specific steps are as follows:

[0053] (1) When the three-phase four-level HCC system works normally, the three-phase modulation wave V ref_a , ...

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Abstract

The invention provides a capacitor voltage fluctuation control method for a hybrid Clapped Converter (HCC) based on open-loop common-mode voltage injection, and belongs to the technical field of power electronics. The control method is based on a three-phase HCC inverter, common-mode voltage with specific amplitude and phase is injected into reference waves, and a phase-shifting pulse width modulation method is used, so that effective control over capacitor voltage and output voltage and current in the HCC converter is completed. The invention provides a common-mode voltage algorithm for generating a common-mode voltage capable of effectively inhibiting the capacitor voltage fluctuation at the bus end, the introduction of a capacitor voltage sensor is avoided through open-loop injection, and the complexity and the cost of controlling an HCC system are reduced. According to the method, violent capacitor voltage fluctuation of the capacitor voltage at the bus end in the HCC converter in a low output frequency band can be remarkably suppressed, the capacitance value and the size of the capacitor at the bus end are reduced, and the system output voltage and current quality and the system power density are improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a hybrid multilevel converter capacitor voltage fluctuation control method based on open-loop common-mode voltage injection. Background technique [0002] The development and innovation of multi-level converter topology is the key to the development of medium-voltage variable frequency drives. Three-level, four-level and five-level converters are considered to be the most promising structures for industrial applications. Compared with the three-level converter, the output voltage of the four-level converter is closer to the sine wave. Compared with the five-level converter, the structure of the four-level converter reduces the control complexity and switch count . Therefore, the four-level converter has attracted more and more researchers' attention. Hybrid Clamped Converter (HCC) is a new type of medium and high voltage multilevel converter. It has 8 switching states...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5395H02M1/32
CPCH02M7/483H02M7/5395H02M1/32
Inventor 潘建宇赵一晖唐海博李剑
Owner CHONGQING UNIV
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