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A control method for reducing loss of full-bridge mmc sub-module

A control method and sub-module technology, which are applied in the directions of high-efficiency power electronic conversion, output power conversion device, climate sustainability, etc., can solve the problems of large operation loss and high construction cost

Inactive Publication Date: 2020-10-30
HUAZHONG UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a control method for reducing the loss of the full-bridge MMC sub-module, thus solving the technical problems of high construction cost and large operating loss in the prior art

Method used

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  • A control method for reducing loss of full-bridge mmc sub-module
  • A control method for reducing loss of full-bridge mmc sub-module
  • A control method for reducing loss of full-bridge mmc sub-module

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Embodiment 1

[0057] In Embodiment 1 of the present invention, under the condition that the transmission capacity of the converter and the voltage of the DC side are kept unchanged, the phase voltage of the AC side is increased to make the modulation coefficient m'=1.414, and combined with double frequency circulating current control, it is used to illustrate the present invention Superiority in reducing converter losses.

[0058] In order to illustrate the effectiveness of the present invention, the parameters of the MMC system shown in Table 1 are taken for calculation.

[0059] Table 1 When the pressure is increased and the modulation coefficient m'=1.414, the system parameter table

[0060] System parameters value Inverter transmission capacity 400MVA Rated AC voltage 346.35kV Rated DC voltage ±200kV Number of bridge arm sub-modules 242 Bridge arm inductance 0.248H(13％) Submodule Capacitance 7424μF

[0061] The reference values ​​...

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Abstract

The invention discloses a control method for reducing the loss of a full-bridge type MMC sub-module, comprising: maintaining the transmission capacity of a converter, keeping the voltage on the DC side constant, and utilizing the negative level output capability of the full-bridge type sub-module to increase the peak value of the voltage on the AC side , so that the new modulation coefficient m′>1; after increasing the peak value of the AC side voltage, the maximum output voltage of the bridge arm increases. In the case of the rated voltage of the sub-module capacitor unchanged, in order to meet the requirements of the maximum output voltage, each bridge arm The number of sub-modules increases, the modulation coefficient of the double frequency voltage component and the phase control parameters are used as variables, and the objective function is established with the lowest converter loss as the goal. The modulation coefficient and phase control parameters of the high-frequency voltage component are used to obtain the target double-frequency voltage component, and the target double-frequency voltage component is superimposed on the bridge arm voltage to reduce the loss of the converter. The invention has low construction cost and small operation loss.

Description

technical field [0001] The invention belongs to the technical field of multi-level power electronic converters, and more specifically relates to a control method for reducing the loss of a full-bridge MMC sub-module. Background technique [0002] Modular Multilevel Converter (MMC) has become the preferred choice of converters in flexible DC transmission due to its advantages of no dynamic and static voltage equalization problems for switching devices, easy expansion, high system efficiency and good output waveform quality. Preferred topology. [0003] In the existing MMC-based flexible direct current transmission projects, converters based on the half-bridge sub-module topology are used. The half-bridge MMC does not have the ability to defend against DC short-circuit faults, and needs to rely on the AC-side circuit breaker or DC-side circuit breaker to clear the DC-side fault. However, if the AC side circuit breaker is used, the circuit breaker can only clear the DC fault ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/53871H02M1/0054Y02B70/10
Inventor 陈宇胡家兵雷宪章杨杰吴亚楠李泓志向慕超
Owner HUAZHONG UNIV OF SCI & TECH