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Bridge arm voltage-sharing control method of modular multilevel resonant converter

A modular multi-level, resonant converter technology, applied in the direction of regulating electrical variables, control/regulating systems, high-efficiency power electronic conversion, etc. Stable and reliable work cannot be guaranteed, etc., to achieve the effect of stable and reliable work and maintaining voltage balance

Active Publication Date: 2019-10-18
ZHEJIANG UNIV
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Problems solved by technology

However, it is difficult to ensure the precise matching of the inductance value by artificially adjusting the inductance value, and with the change of the external environment (temperature), the change of the inductance value is difficult to predict, and the long-term stable and reliable operation of MMR cannot be guaranteed.

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  • Bridge arm voltage-sharing control method of modular multilevel resonant converter
  • Bridge arm voltage-sharing control method of modular multilevel resonant converter
  • Bridge arm voltage-sharing control method of modular multilevel resonant converter

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with drawings and embodiments.

[0027] The modular multilevel resonant converter MMR (such as figure 1 As shown), it includes an inverter circuit 10, a resonant network 20, a transformer 30, a rectifier 40 and an output capacitor 50. The resonant network 20 is composed of an inductor and a capacitor. The inverter circuit 10 and the resonant network 20 are located on the primary side of the transformer 30; the rectifier 40 and the output capacitor 50 are located on the secondary side of the transformer 30; V i , V o are the converter input and output voltages, respectively; each leg contains an inductor L 1 or L 2 and at least one sub-module Cell connected in series with the inductor; each sub-module Cell has the same structure, including an upper switch tube S 1 , a lower switch tube S 2 and a capacitor C, switch S 2 , S 2 After being connected in series and connected to both sides of the capac...

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Abstract

The invention relates to a DC-DC conversion technology, and aims to provide a bridge arm voltage-sharing control method of a modular multilevel resonant converter. The modular multilevel resonant converter comprises a modular inversion circuit, a resonant network, a transformer, a rectifier and an output capacitor. Bridge arm voltage-sharing control is in a way that voltage amplitudes of an upperbridge arm and a lower bridge arm is balanced by adjusting DC components of middle-point voltages of the bridge arms. According to the voltage-sharing control method provided by the invention, the DCcomponents of the middle-point voltages of the bridge arms are controlled, the voltage distribution of the upper bridge arm and the lower bridge arm is automatically corrected by closed-ring control on the premise that a switch frequency is not adjusted, the voltage balance of the upper bridge arm and the lower bridge arm is maintained, and meanwhile, the normal working state of MMR is not changed. By the control method, the inductance values of the bridge arms are not needed to be adjusted by manual, the bridge arm voltage automatic balance of the modular multilevel resonant converter is achieved by control, and the converter is enabled to stably and reliably work.

Description

technical field [0001] The invention relates to DC-DC conversion technology, in particular to a voltage equalization control method between bridge arms of two modularized multilevel resonant converters in the field of power electronics technology, which is used to realize stable and reliable conversion from medium-high voltage DC to low-voltage DC. Background technique [0002] In applications such as power systems and ships, it is often necessary to convert medium and high voltage DC to low voltage DC, such as the distribution of power from medium voltage DC power grids to industrial and civilian low voltage power grids. In this type of application, the modular multilevel resonant converter MMR (ModularMultilevel Resonant, post-stage DC / DC) proposed by the Chinese invention patent "A Resonant Power Electronic Converter and Converter Device" (Application No. Isolation circuit) integrates the advantages of modular multilevel converters and resonant converters, and has a good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/483
CPCH02M3/3353H02M7/483H02M7/4835Y02B70/10
Inventor 李雨岑邵帅李楚杉张军明姚文熙李武华
Owner ZHEJIANG UNIV
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