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A Modular Multilevel Converter Loss Evaluation Method and System

A modular multi-level converter technology, applied in the direction of power transmission AC network, conversion of AC power input to DC power output, electrical components, etc., can solve problems such as difficult to determine loss factor, poor accuracy, etc., to reduce difficulty , solve the effect of poor accuracy and simplify the loss assessment process

Active Publication Date: 2022-02-15
ZHUHAI POWER SUPPLY BUREAU GUANGDONG POWER GIRD CO
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  • Claims
  • Application Information

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Problems solved by technology

[0004] This application provides a method and system for evaluating the loss of a modular multilevel converter, which is used to solve the technical problems in the prior art that the accuracy of the loss evaluation of the converter is poor and it is difficult to determine the loss factor

Method used

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  • A Modular Multilevel Converter Loss Evaluation Method and System
  • A Modular Multilevel Converter Loss Evaluation Method and System
  • A Modular Multilevel Converter Loss Evaluation Method and System

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Embodiment Construction

[0046]In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is a part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0047] see figure 1 , a method for evaluating the loss of a modular multilevel converter provided in Embodiment 1 of the present application, including:

[0048] Step 101. Obtain n sets of historical operation data of the converter at different times. The historical operation data includes: the active power of the AC side of the converter, the reactive power of the...

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Abstract

The present application discloses a method and system for evaluating the loss of a modular multilevel converter, wherein the method includes: obtaining n sets of historical operation data of the converter at different times, and the historical operation data includes: the active power of the AC side of the converter Power, reactive power on the AC side, active power on the DC side at the same time, switching frequency of the switching device at the same time, n is a positive integer; calculate the converter loss according to the historical operating data and perform normalization processing, and pass the Neel test Data cleaning is carried out by using the method to obtain the first operation data after cleaning; the current variable is replaced by the power variable, and the power frequency fitting item is added to construct the loss characteristic description equation; the loss characteristic description equation is fitted by the first operation data, and Solve the fitted function to obtain the loss of the converter. Therefore, the technical problems that the accuracy of converter loss evaluation is poor and the loss factor is difficult to determine in the prior art are solved.

Description

technical field [0001] The present application relates to the technical field of flexible direct current transmission, and in particular to a method and system for evaluating loss of a modular multilevel converter. Background technique [0002] At present, the modular multilevel converter (MMC) has been widely used in the fields of flexible DC power transmission, flexible DC power distribution, flexible interconnection of AC grid, low-voltage DC remote power supply, etc. Core power conversion device. Due to the large number of MMC sub-modules, complex operating conditions, various types of circuit topologies, and various types of power switching devices, it is difficult to accurately evaluate the loss of them. The lack of an effective quantitative evaluation method for converter loss characteristics makes it difficult to reduce converter losses by rationally distributing power flows in DC power transmission and distribution applications where converters are widely used, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/217H02J3/36
CPCH02M7/483H02M7/217H02J3/36Y02E60/60
Inventor 甘德树陈建福曹安瑛丘冠新刘尧林桂辉杜成涛王超刘行健裴星宇廖石江幸旭彬
Owner ZHUHAI POWER SUPPLY BUREAU GUANGDONG POWER GIRD CO
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