Influence of the Inverse-Time Protection Relays on the Voltage Dip Index

doi:10.1007/s12204-014-1509-3

摘要/Abstract

摘要： The probability-assessment analyses on the characteristic value of voltage dip by using Monte Carlo stochastic modeling method to stimulate the randomness of the short circuit fault are introduced. Using Matlab and Power Systems CAD (PSCAD), we design control interface which combines the electromagnetic transient simulation with the Monte Carlo method. Specifically, the designing of interface which is meant to employ the method of Matlab programming to control the electromagnetic transients including direct current (EMTDC) simulation is introduced. Furthermore, the influences of the protection devices on the voltage dip to ensure the authenticity and the referential reliability are simulated. A system with the inverse-time protection devices equipped on each line which can coordinate together is designed to cut off the short-circuit fault. The voltage dip of the designed system is assessed by the pre- and post-system average root mean square (RMS) variation frequency index, and the voltage dip index is compared with the Information Technology Industry Council (ITIC) curves. The simulation results demonstrate that the inverse-time relay protection equipments are well-coordinated, and the severity and the range of the voltage dip are influenced by the cooperation of the equipped inverse-time protection devices.

关键词: power quality, voltage dip, inverse-time protection relay, Monte Carlo algorithm, simulation

Abstract: The probability-assessment analyses on the characteristic value of voltage dip by using Monte Carlo stochastic modeling method to stimulate the randomness of the short circuit fault are introduced. Using Matlab and Power Systems CAD (PSCAD), we design control interface which combines the electromagnetic transient simulation with the Monte Carlo method. Specifically, the designing of interface which is meant to employ the method of Matlab programming to control the electromagnetic transients including direct current (EMTDC) simulation is introduced. Furthermore, the influences of the protection devices on the voltage dip to ensure the authenticity and the referential reliability are simulated. A system with the inverse-time protection devices equipped on each line which can coordinate together is designed to cut off the short-circuit fault. The voltage dip of the designed system is assessed by the pre- and post-system average root mean square (RMS) variation frequency index, and the voltage dip index is compared with the Information Technology Industry Council (ITIC) curves. The simulation results demonstrate that the inverse-time relay protection equipments are well-coordinated, and the severity and the range of the voltage dip are influenced by the cooperation of the equipped inverse-time protection devices.

Key words: power quality, voltage dip, inverse-time protection relay, Monte Carlo algorithm, simulation

中图分类号:

TM 774

GAO Xin-ke1,2* (高新科), LIU Ya-peng3 (刘玡朋). Influence of the Inverse-Time Protection Relays on the Voltage Dip Index[J]. 上海交通大学学报（英文版）, 2014, 19(3): 354-360.

GAO Xin-ke1,2* (高新科), LIU Ya-peng3 (刘玡朋). Influence of the Inverse-Time Protection Relays on the Voltage Dip Index[J]. Journal of shanghai Jiaotong University (Science), 2014, 19(3): 354-360.

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