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A Determination Method for On-state Loss of Modular Multilevel Converter

A modular multi-level, multi-level converter technology, applied in the direction of complex mathematical operations, can solve the problem of poor practicability and the inability to simply obtain the power factor of MMC loss and converter modulation degree, and the quantification of active transmission power relationship, it is difficult to optimize the seamless connection of design programs, etc.

Active Publication Date: 2020-07-21
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The loss estimation based on average current and effective current fails to give the analytical expression of MMC loss, and it is impossible to simply obtain the quantitative relationship between MMC loss and converter modulation degree, power factor, active transmission power, etc.; online loss calculation needs to obtain MMC Calculate the voltage, current and drive signal of the inverter at each moment, which is not very practical in the system optimization design stage, and it is difficult to seamlessly connect with the optimization design program

Method used

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  • A Determination Method for On-state Loss of Modular Multilevel Converter
  • A Determination Method for On-state Loss of Modular Multilevel Converter
  • A Determination Method for On-state Loss of Modular Multilevel Converter

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Embodiment Construction

[0073] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0074] The present invention provides a method for determining the on-state loss of a modular multilevel converter, wherein the circuit topology diagram of a modular multilevel voltage source converter is as follows figure 1 As shown, it is composed of three phases, and each phase is composed of upper and lower bridge arms with the same structure in series; the midpoint of the upper and lower bridge arms is connected to the AC end of the modular multilevel converter;

[0075] Each of the upper and lower bridge arms includes a reactor and N submodules with the same structure; after the submodules of each bridge arm are cascaded, one end passes through the reactor and the modular multilevel converter The sub-modules of each bridge arm are cascaded and the other end is connected to one end of the cascaded sub-modules of the...

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Abstract

The invention relates to a method for determining on-state loss of a modularized multilevel converter. The method comprises the steps of determining IGBT (Insulated Gate Bipolar Transistor) on-state loss in single-phase upper and lower bridge arms of the modularized multilevel converter; determining diode on-state loss in the single-phase upper and lower bridge arms of the modularized multilevel converter; and determining three-phase on-state loss of the modularized multilevel converter. According to the method, an analytic expression of the on-state loss of the modularized multilevel converter is effectively solved based on instantaneous currents of an IGBT and a diode, thereby facilitating quantitative analysis of the on-state loss of the MMC (modularized multilevel converter) and bringing convenience for system optimization design.

Description

technical field [0001] The invention relates to a calculation method of power electronics technology, in particular to a method for determining the on-state loss of a modular multilevel converter. Background technique [0002] Since 2002, R.Marquart and A.Lesnicar of the Federal Defense University in Munich jointly proposed the Modular Multilevel Converter (MMC). The flow device field has been widely developed and applied, and its topology is as follows figure 1 shown. In terms of flexible DC transmission systems based on voltage source converters, the Transbay grid interconnection project put into operation by Siemens in the United States in 2010 and the Nanhui flexible DC transmission demonstration project in China in 2011 both used MMC converters; In terms of high-voltage DC transformers, MMC-based high-voltage DC / DC converters (DC transformers) have become research hotspots at home and abroad; in the field of motor drive applications, a large number of scholars have st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/10
Inventor 王新颖汤广福贺之渊魏晓光张升周万迪
Owner STATE GRID CORP OF CHINA
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