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Method and device for evaluating the performances of modularized multi-level current converters

A modular multi-level and evaluation method technology, applied in the direction of power transmission AC network, emergency treatment AC circuit layout, etc., can solve the problem of insufficient performance evaluation of modular multi-level converters, and achieve a simple and reliable calculation method , perfect performance evaluation, easy to achieve effect

Active Publication Date: 2017-07-11
XUJI GRP +4
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Problems solved by technology

[0006] The purpose of the present invention is to provide a performance evaluation method and device for a modular multilevel converter, which is used to solve the problem that the performance evaluation of a modular multilevel converter is not perfect in the prior art

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  • Method and device for evaluating the performances of modularized multi-level current converters
  • Method and device for evaluating the performances of modularized multi-level current converters

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Embodiment Construction

[0028] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0029] An embodiment of a performance evaluation method of a modular multilevel converter of the present invention:

[0030]A performance evaluation method for a modular multilevel converter (MMC). First, calculate the current suppression time and sub-module voltage deviation of different modular multi-level converters; The weight of each sub-module determines the fault fast recovery performance index of each sub-module, and evaluates the performance of each modular multilevel converter according to the performance index. The evaluation method increases the calculation of the sub-module voltage deviation, which makes the performance evaluation of the modular multilevel converter more complete and more accurate.

[0031] In order to make the evaluation of the modular multilevel converter more perfect, the evaluation method of the present invention...

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Abstract

The invention proposes a method and a device for evaluation the performances of modularized multi-level current converters. The method comprises: through the calculation of the current suppression time of various modularized current converters and the voltage deviation of the sub-modules, and then, based on the weights between the current suppression time and the sub-module voltage deviation and the modularized current converters, calculating the performance indexes of the modularized multi-level current converters including the evaluation on the cost of the current converters; and then, determining the performances of the modularized multi-level current converters so as to assist the selection of topology structure of the modularized multi-level current converters. According to the method and the device of the invention, the evaluations on the performances of the current converters are more improved, and the current suppression time and the voltage deviation of the sub-modules can be obtained through model calculations rather than through simulation or testing. The calculation method is simple, reliable and easy to perform.

Description

technical field [0001] The invention belongs to the fields of flexible power transmission and distribution of power systems and power electronics, and in particular relates to a performance evaluation method and device of a modular multilevel converter. Background technique [0002] Since the German scholar Rainer Marquardt proposed the modular multilevel converter (MMC), due to its modular design, low switching frequency, low loss, low harmonic content and many other advantages, it was first developed by Siemens in high-voltage flexible DC transmission. The field has been put into engineering applications, and has received extensive attention at home and abroad. However, its engineering application is facing the serious threat of DC short-circuit faults. After the MMC converter fails, it will form two discharge circuits, the series discharge of the sub-module capacitors and the uncontrolled rectification discharge of the AC system, and feed the fault current to the DC fault...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/001H02J3/36Y02E60/60
Inventor 张浩吴金龙李道洋王先为刘欣和姚为正韩坤
Owner XUJI GRP
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