Method for starting hybrid MMC (Modular Multilevel Converter) including full-bridge submodules

A full-bridge sub-module and hybrid technology, used in output power conversion devices, power transmission AC networks, electrical components, etc. Output voltage, the effect of reducing inrush current

Active Publication Date: 2018-02-09
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

This solves the technical problems of the prior art in controlling the inrush current in the start-up phase and cutting off the voltage drop of the current-limiting resistor

Method used

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  • Method for starting hybrid MMC (Modular Multilevel Converter) including full-bridge submodules
  • Method for starting hybrid MMC (Modular Multilevel Converter) including full-bridge submodules
  • Method for starting hybrid MMC (Modular Multilevel Converter) including full-bridge submodules

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0033] Such as figure 1 As shown, the hybrid MMC includes three phases A, B, and C. Each phase consists of two identical upper and lower bridge arms. Each bridge arm contains N sub-modules, of which F is a full-bridge sub-module, and the remaining H One is a half-bridge sub-module, the sub-modules are connected in cascade, and a bridge arm inductor is connected in series. The half-bridge sub-m...

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Abstract

The invention discloses a method for starting hybrid MMC (Modular Multilevel Converter) including full-bridge submodules, and belongs to the technical field of flexible high-voltage direct-current power transmission. The method comprises an uncontrolled charging stage and a controlled charging stage, wherein at the uncontrolled charging stage, all the submodules are locked, and capacitors in the submodules are charged by an alternating-current power grid. At the end of the uncontrolled charging stage, the controlled charging stage is entered, a current converter is unlocked, a closed-loop control loop is added to control submodule switch tubes, and submodule capacitors are further charged to a rated voltage. A starting process is finished when voltages of all submodule capacitors reach therated voltage and a direct-current side voltage reaches a rated direct-current bus voltage. By adopting the method, the current converter is controlled to run under an increased voltage at the controlled charging stage by means of the negative level output capabilities of the full-bridge submodules, so that an alternating-current side output voltage is increased; impact current of the alternating-current power grid in a charging process is reduced; a current-limiting resistor is switched off under low current; and influence on the service life of a power device is avoided.

Description

technical field [0001] The invention belongs to the technical field of flexible high-voltage direct current transmission, and more specifically relates to a hybrid MMC startup method including full-bridge sub-modules. Background technique [0002] In recent years, problems such as global energy shortage and environmental pollution have continued to aggravate, and the situation has become increasingly severe. The scale and form of utilization of renewable energy such as wind energy and solar energy have continued to expand. The advantages of good performance and flexible operation mode have gradually attracted the attention of scholars at home and abroad. It has been developed rapidly and has been vigorously promoted in engineering. [0003] Compared with the traditional DC transmission technology, the HVDC (High-Voltage Direct-Current) technology based on the voltage source converter VSC (Voltage Source Converter) has the following advantages: no reactive power compensation,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02J3/36
CPCY02E60/60H02M1/36H02J3/36
Inventor 林磊李昂徐晨胡家兵
Owner HUAZHONG UNIV OF SCI & TECH
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