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1. CN112016043 - Method for calculating steady-state fault current of modular multilevel converter

Office
China
Application Number 202010641371.3
Application Date 06.07.2020
Publication Number 112016043
Publication Date 01.12.2020
Publication Kind A
IPC
G06F 17/18
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
17Digital computing or data processing equipment or methods, specially adapted for specific functions
10Complex mathematical operations
18for evaluating statistical data
G01R 19/00
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
19Arrangements for measuring currents or voltages or for indicating presence or sign thereof
H02H 1/00
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
1Details of emergency protective circuit arrangements
H02H 7/125
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
7Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
10for converters; for rectifiers
12for static converters or rectifiers
125for rectifiers
H02J 3/36
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
36Arrangements for transfer of electric power between ac networks via a high-tension dc link
CPC
G06F 17/18
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
FELECTRIC DIGITAL DATA PROCESSING
17Digital computing or data processing equipment or methods, specially adapted for specific functions
10Complex mathematical operations
18for evaluating statistical data ; , e.g. average values, frequency distributions, probability functions, regression analysis
G01R 19/0092
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
19Arrangements for measuring currents or voltages or for indicating presence or sign thereof
0092measuring current only
H02H 1/0007
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
1Details of emergency protective circuit arrangements
0007concerning the detecting means
H02H 1/0092
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
1Details of emergency protective circuit arrangements
0092concerning the data processing means, e.g. expert systems, neural networks
H02H 7/125
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
7Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
10for converters; for rectifiers
12for static converters or rectifiers
125for rectifiers
H02J 3/36
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
3Circuit arrangements for ac mains or ac distribution networks
36Arrangements for transfer of electric power between ac networks via a high-tension dc link
Applicants BEIJING JIAOTONG UNIVERSITY
北京交通大学
Inventors HE JINGHAN
和敬涵
LI MENG
李猛
LUO YIPING
罗易萍
WANG XIAOJUN
王小君
XU YIN
许寅
ZHANG DAHAI
张大海
LUO GUOMIN
罗国敏
ZHANG FANG
张放
WU XIANGYU
吴翔宇
NI PINGHAO
倪平浩
WANG YING
王颖
Agents 北京市商泰律师事务所 11255
Title
(EN) Method for calculating steady-state fault current of modular multilevel converter
(ZH) 模块化多电平换流器的稳态故障电流的计算方法
Abstract
(EN) The invention provides a method for calculating steady-state fault current of a modular multilevel converter (MMC). The method comprises the following steps: calculating direct-current side critical resistance values R < A >/B, R < B >/C and R < C >/D of the MMC according to a bridge arm inductance coefficient k and alternating-current side reactance X < ac > of the MMC; judging the working mode of the MMC according to the RA/B, the RB/C and the RC/D; parameter k, the Us, the Rdc and the direct current side critical resistance values RA/B, RB/C and RC/D respectively calculate steady-state direct current fault current and conduction overlapping angles in various working modes when the alternating current side resistance is not considered; and according to the direct currents and the conduction overlapping angles in various working modes, respectively calculating steady-state alternating current fault current amplitudes and phase angles in various working modes when the alternating current side resistance is not considered. And calculating the steady-state AC fault current amplitude and phase angle in various working modes when the AC side resistance is considered. According to the method, the fault currents of the alternating current side and the direct current side of the MMC fault steady-state stage can be obtained at the same time; the calculation precision is high, and an additional iterative algorithm is not needed; and the method can adapt to a scene with large alternating-current-side power grid damping.
(ZH) 本发明提供了一种模块化多电平换流器(MMC)的稳态故障电流的计算方法。该方法包括:根据MMC的桥臂电感系数k和交流侧电抗Xac计算出MMC的直流侧临界电阻值RA/B、RB/C和RC/D;根据RA/B、RB/C和RC/D判断MMC的工作模式;根据参数k,Us,Rdc和直流侧临界电阻值RA/B、RB/C和RC/D分别计算出不考虑交流侧电阻时的各种工作模式下稳态直流故障电流和导通重叠角,根据各种工作模式下的直流电流和导通重叠角,分别计算出不考虑交流侧电阻时各种工作模式下的稳态交流故障电流幅值和相角。进而计算出考虑交流侧电阻时各种工作模式下的稳态交流故障电流幅值和相角。本发明的方法能够同时获得MMC故障稳态阶段交流侧和直流侧的故障电流;计算精度高,不需要额外的迭代算法;能够适应交流侧电网阻尼较大的场景。
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