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Method for calculating loss of MMC (Modular Multilevel Converter)

A technology for on-state loss and calculation of switching, applied in computing, special data processing applications, instruments, etc., can solve the problems of low loss calculation accuracy and large amount of calculation, and achieve fast calculation, shorten calculation and simulation time, real and reliable. The effect of data sources

Inactive Publication Date: 2014-12-17
STATE GRID CORP OF CHINA +1
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  • Application Information

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Problems solved by technology

[0013] Aiming at the deficiencies in the prior art, the present invention provides a method for calculating the loss of MMC, and in particular relates to a method for calculating the loss of a converter valve for MMC (Modular Multilevel Converter, Modular Multilevel Converter), which is used to replace the commonly used The loss calculation method solves the problems of large amount of calculation, low loss calculation accuracy, coupling of control method and loss calculation in the existing calculation methods

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  • Method for calculating loss of MMC (Modular Multilevel Converter)
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  • Method for calculating loss of MMC (Modular Multilevel Converter)

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Embodiment Construction

[0042] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0043] A method for calculating the loss of MMC according to the present invention, the specific method is as follows, among which, a 3300V, 1500A IGBT is taken as an example for description.

[0044] 1. Use the datasheet to extract the parameters, as shown in Table-1 to Table-5:

[0045] Table 1 IGBT V CE -I C relationship

[0046]

[0047]

[0048] Table 2 IGBT switching loss relationship (E SW -I C )

[0049]

[0050] Table 3 IGBT switching loss (E SW -R G )

[0051]

[0052] Table 4 Diode V F -I F

[0053]

[0054] Table 5 Diode reverse recovery loss (Erec-I F )

[0055]

[0056] 2. Use the data in step (1) to perform interpolation to generate graphs and tables of on-state loss and switching loss. The data in the table are only examples. In actual calculations, the temperature increase or the current increase will be smaller.

[0057] Ta...

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Abstract

The invention relates to a method for calculating the loss of an MMC (Modular Multilevel Converter). The method comprises the following steps: (1) extracting a parameter; (2) interpolating the parameter to generate a figure and a table of conduction losses and switching losses; (3) simulating to obtain current and input environment temperature, and looking up the loss of a current time in the table; (4) calculating a junction temperature, and calculating a next node; (5) converging to obtain loss. By adopting the method, the calculation and simulation time can be shortened greatly, and a more real and reliable data source is provided in comparison to simple curve fitting. By adopting the method, real-time calculation of the internal junction temperature of an IGBT (Insulated Gate Bipolar Translator) module becomes possible; the method has high practical values in state monitoring of the IGBT module, estimation of the service life of the IGBT module, prolonging of the service life of an IGBT module device, and improvement on the reliability of the IGBT module device, and the like.

Description

Technical field [0001] The invention relates to a loss calculation method, in particular to a loss calculation method for MMC. Background technique [0002] In addition to its outstanding performance in long-distance high-power transmission, non-synchronous AC system connection, and submarine cable transmission, flexible DC transmission has excellent performance in passive power supply, island systems, grid connection of new energy power systems, and small-capacity submarine cable transmission. With its own characteristics. The MMC-based flexible direct current transmission technology can greatly reduce the switching frequency of the switching device, from the thousand Hz level to the 100 Hz level, which greatly reduces the switching loss of a single switching device. But when the number of MMC sub-modules is large, the total MMC loss is still very large. The loss characteristics of MMC greatly determine the selection of cooling device, system reliability design and the choice ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 乔尔敏于海玉荆平赵国亮
Owner STATE GRID CORP OF CHINA
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