A method for calculating the on-state loss of a modular multilevel converter power module

A modular multi-level, power module technology, used in output power conversion devices, AC power input conversion to DC power output, high-efficiency power electronic conversion and other directions, can solve rough problems, achieve accurate bridge arm current calculation, Accurate on-state loss calculation, accurate loss calculation effect
CN107370412BActive Publication Date: 2019-12-24SHENZHEN AUTO ELECTRIC POWER PLANT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHENZHEN AUTO ELECTRIC POWER PLANT
Publication Date
2019-12-24

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Abstract

The invention discloses a method for calculating on-state loss of a power module of a modularized multilevel converter, which comprises the following steps: 1) calculating the bridge arm current according to the electrical parameters and operating parameters of the MMC system; 2) calculating the bridge arm current according to the electrical parameters of the MMC system Calculate the double frequency component of the bridge arm circulation with the operating parameters, and correct the bridge arm current calculated in step 1); 3) calculate the equivalent current proportional coefficient ρ of each device in the bridge arm sub-module, and combine step 2 ) to obtain the bridge arm current, calculate the equivalent current average value and the mean square value of the device in the power frequency cycle; 4) extract the conduction characteristic parameters of the device, and combine the device equivalent current average value and the device equivalent current calculated in step 3) The mean square value calculates the on-state loss of the power module. Compared with the traditional loss calculation method, the invention can realize finer and more accurate on-state loss calculation, and provide reasonable basis for junction temperature evaluation and type selection of MMC sub-module devices.
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Description

technical field

[0001] The invention belongs to the technical field of power electronics, and in particular relates to a method for calculating on-state loss of a power module of a modularized multilevel converter. Background technique

[0002] Modular Multilevel Converter (MMC) has been gradually used in flexible direct current transmission systems. It has the characteristics of flexible control, low switching frequency, and low harmonic content on the AC side. Currently, based on this technology, it is under construction The maximum transmission capacity of Zhangbei Rouzhi Project has reached ±500kV, 3000MW. The loss calculation of the converter power module is not only the basis of the heat dissipation design of the converter, but also used to measure the performance of the flexible DC transmission system.

[0003] MMC uses insulated gate bipolar transistor (insulated gate bipolar transistor, IGBT) as the core device, and the loss of MMC mainly includes the loss of power...

Claims

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