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Calculation method of on-state loss of modular multilevel converter power module

A modular multi-level, power module technology, applied in the direction of output power conversion device, AC power input conversion to DC power output, high-efficiency power electronic conversion, etc., can solve rough and other problems, and achieve accurate calculation of bridge arm current, Accurate on-state loss calculation, accurate loss calculation effect

Active Publication Date: 2017-11-21
SHENZHEN AUTO ELECTRIC POWER PLANT
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Problems solved by technology

However, the existing on-state loss calculation method is too rough, and further improvement is still needed to obtain a more accurate loss calculation

Method used

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  • Calculation method of on-state loss of modular multilevel converter power module
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  • Calculation method of on-state loss of modular multilevel converter power module

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Embodiment Construction

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0045] Taking the Kangbao Station System of Zhangbei Project as an example for analysis. System structure such as Figure 4 The main parameters of the system are shown in Table 1.

[0046] Table 1 Main parameters of MMC system in Zhangbei Engineering Kangbao Station

[0047]

[0048] According to the main parameters of the system, choose to use the IGBT module of model 5SNA 3000K452300 produced by ABB Company. According to the device data sheet for Figure 5 , Image 6 The characteristic curves of IGBT and FWD in are fitted once, and the data in Table 2 can be obtained.

[0049] Table 2 On-voltage drop and on-resistance of IGBT power module (at 125°C)

[0050]

[0051]

[0052] (Note: The fitting result is a linear function, that is, the conduction voltage drop is considered to be V(i)=V 0 +R 0 i)

[0053] In the embodiment of the pres...

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Abstract

The invention discloses a calculation method of an on-state loss of a modular multilevel converter (MMC) power module. The calculation method comprises the following steps of 1) determining bridge arm current according to an electric parameter and an operating parameter of an MMC system, 2) determining a frequency doubling component of bridge arm ring current according to the electric parameter and the operating parameter of the MMC system and correcting the bridge arm current calculated in Step 1), 3) calculating a ratio coefficient rho of equivalent current of devices in a bridge arm submodule and calculating a mean value and a mean square value of the equivalent current of the devices within a power frequency period by combining the bridge arm current obtained in Step 2), and 4) extracting on-state characteristic parameters of the devices and calculating the on-state loss of the power module by combining the mean value and the mean square value of the equivalent current of the devices calculated in Step 3). Compared with the traditional loss calculation method, the calculation method can realize finer and more precise on-state loss calculation, and provides a reasonable criterion for junction temperature evaluation and type selection of an MMC submodule device.

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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Application Information

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IPC IPC(8): H02M7/797
CPCH02M7/797H02M1/0054Y02B70/10
Inventor 王跃尹诗媛周晖王璋尹太元段国朝
Owner SHENZHEN AUTO ELECTRIC POWER PLANT