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1. WO2019127440 - METHOD AND DEVICE FOR HANDLING DIRECT CURRENT ARC

Publication Number WO/2019/127440
Publication Date 04.07.2019
International Application No. PCT/CN2017/120040
International Filing Date 29.12.2017
IPC
H02H 3/00 2006.1
HELECTRICITY
02GENERATION, CONVERSION, OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
G01R 31/00 2006.1
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
CPC
G01R 31/00
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
G01R 31/52
GPHYSICS
01MEASURING; TESTING
RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
31Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
50Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
52Testing for short-circuits, leakage current or ground faults
H02H 1/0015
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
1Details of emergency protective circuit arrangements
0007concerning the detecting means
0015Using arc detectors
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 3/33
HELECTRICITY
02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
3Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection
26responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
32involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
33using summation current transformers
H02H 7/20
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
20for electronic equipment
Applicants
  • 华为技术有限公司 HUAWEI TECHNOLOGIES CO., LTD. [CN]/[CN]
Inventors
  • 刘方诚 LIU, Fangcheng
  • 辛凯 XIN, Kai
  • 刘云峰 LIU, Yunfeng
Agents
  • 深圳市深佳知识产权代理事务所(普通合伙) SHENPAT INTELLECTUAL PROPERTY AGENCY
Priority Data
Publication Language Chinese (zh)
Filing Language Chinese (ZH)
Designated States
Title
(EN) METHOD AND DEVICE FOR HANDLING DIRECT CURRENT ARC
(FR) PROCÉDÉ ET DISPOSITIF DE TRAITEMENT D'ARC DE COURANT CONTINU
(ZH) 一种直流电弧的处理方法及装置
Abstract
(EN) A method and device for handling a direct current arc. The method may comprise: acquiring a first current (801), the first current being a direct current input current of a direct current cable connected to a photovoltaic battery system; acquiring a second current (802), the second current being a direct current common-mode current of the direct current cable or an alternating current common-mode current of an alternating current cable; calculating a correlation coefficient between the frequency-domain component of the first current and the frequency-domain component of the second current (803); and when the first current is determined as meeting an arc existence condition and the correlation coefficient as being greater than or equal to a preset coefficient threshold, refraining from issuing a direct current arc fault warning (805). The method and device reflect via the correlation coefficient the proportion of a common-mode noise generated by the second current and set the preset coefficient threshold, if the correlation coefficient is greater than the coefficient threshold, then it means that the condition for arc existence met by the first current is generated due to a great common-mode noise, and under such premises, no alarm needs to be issued, thus reducing interference of the normal operation of an inverter, and increasing product performance.
(FR) L'invention concerne un procédé et un dispositif de traitement d'arc de courant continu. Le procédé peut comprendre les étapes consistant : à acquérir un premier courant (801), le premier courant étant un courant d'entrée de courant continu d'un câble à courant continu connecté à un système de batterie photovoltaïque ; à acquérir un second courant (802), le second courant étant un courant de mode commun de courant continu du câble à courant continu ou un courant de mode commun de courant alternatif d'un câble à courant alternatif ; à calculer un coefficient de corrélation entre la composante de domaine de fréquence du premier courant et la composante de domaine de fréquence du second courant (803) ; et lorsqu'il est établi que le premier courant satisfait une condition d'existence d'arc et que le coefficient de corrélation est supérieur ou égal à un seuil de coefficient prédéfini, à s'abstenir d'émettre un avertissement de défaut d'arc de courant continu (805). Le procédé et le dispositif permettent de refléter, par l'intermédiaire du coefficient de corrélation, la proportion d'un bruit de mode commun produite par le second courant et de définir le seuil de coefficient prédéfini ; si le coefficient de corrélation est supérieur au seuil de coefficient, alors cela signifie que la condition d'existence d'arc satisfaite par le premier courant est produite en raison d'un bruit de mode commun important, et sur une telle base, aucune alarme n'a besoin d'être émise, ce qui permet de réduire l'interférence du fonctionnement normal d'un onduleur, et d'augmenter la performance du produit.
(ZH) 一种直流电弧的处理方法及装置。该方法可包括获取第一电流(801),第一电流为与光伏电池系统连接的直流线缆的直流输入电流;获取第二电流(802),第二电流为直流线缆的直流共模电流或者交流线缆的交流共模电流;计算第一电流的频域分量和第二电流的频域分量之间的相关系数(803);当确定第一电流满足电弧存在条件且相关系数大于或等于预设系数阈值时,不发出直流电电弧故障警告(805)。该方法及装置通过相关系数来反应第二电流产生的共模噪声的占比,并设定一预设系数阈值,如果该相关系数大于该系数阈值,则表示第一电流满足电弧存在的条件是由于共模噪声较大而产生,而此情形下,不需要发出告警,减少对逆变器正常工作的干扰,提升产品性能。
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