Compensation of the Current-Transformer Saturation Effects for Digital Relays

被引:49
作者
Ajaei, Firouz Badrkhani [1 ]
Sanaye-Pasand, Majid [1 ,2 ]
Davarpanah, Mahdi [1 ]
Rezaei-Zare, Afshin [3 ]
Iravani, Reza [3 ]
机构
[1] Univ Tehran, Coll Engn, Sch Elect & Comp Engn, Tehran 14395515, Iran
[2] Univ Tehran, Control & Intelligent Proc Ctr Excellence, Sch Elect & Comp Engn, Tehran 14395515, Iran
[3] Univ Toronto, Dept Elect & Comp Engn, Toronto, ON M5S 3G4, Canada
关键词
Current transformer (CT); digital relays; least error squares (LES) method; magnetic saturation; Preisach theory; SECONDARY CURRENTS; HYSTERESIS; ALGORITHM; FORMULATION; PROTECTION; MODELS;
D O I
10.1109/TPWRD.2011.2161622
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A current transformer (CT) is accurately modeled for representation of the CT saturation effects on digital protective relays. Simulation studies performed in the PSCAD/EMTDC platform are used to investigate the impacts of CT saturation on the current phasor estimation. A new algorithm is also proposed for detection and compensation of CT saturation effects, based on: a least error squares (LES) filter which estimates the phasor parameters of the CT secondary current; a novel saturation detection method which uses the output of the LES filter for saturation detection; and a new minimum estimation error tracking approach which enhances the precision of the phasor estimation. The proposed saturation detection/compensation algorithm is independent of the parameters of the CT, the burden, and the power system. The study results show that the proposed algorithm: 1) reconstructs the distorted current waveform, under dc and ac saturation conditions, with the required precision and speed and 2) performs satisfactorily under inductive burden and under deep and slight saturation conditions.
引用
收藏
页码:2531 / 2540
页数:10
相关论文
共 34 条
[1]  
[Anonymous], 5191999 IEEE
[2]   Compensation of nonlinearities in a current transformer for the reconstruction of the primary current [J].
Bittanti, S ;
Cuzzola, FA ;
Lorito, F ;
Poncia, G .
IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, 2001, 9 (04) :565-573
[3]  
Chawande P., 2005, P 7 INT POW ENG C SI, P1
[4]   Current transformer saturation detectors for busbar differential protection [J].
Dashti, H. ;
Sanaye-Pasand, M. ;
Davarpanah, M. .
2007 42ND INTERNATIONAL UNIVERSITIES POWER ENGINEERING CONFERENCE, VOLS 1-3, 2007, :338-343
[5]   Hysteresis modeling based on symmetric minor loops [J].
Dlala, E ;
Saitz, J ;
Arkkio, A .
IEEE TRANSACTIONS ON MAGNETICS, 2005, 41 (08) :2343-2348
[6]   Inverted and forward Preisach models for numerical analysis of electromagnetic field problems [J].
Dlala, Emad ;
Saitz, Julius ;
Arkkio, Antero .
IEEE TRANSACTIONS ON MAGNETICS, 2006, 42 (08) :1963-1973
[7]   ON NUMERICAL IMPLEMENTATION OF HYSTERESIS MODELS [J].
DOONG, T ;
MAYERGOYZ, ID .
IEEE TRANSACTIONS ON MAGNETICS, 1985, 21 (05) :1853-1855
[8]   A GENERAL APPROACH TO HYSTERESIS .4. AN ALTERNATIVE FORMULATION OF THE DOMAIN MODEL [J].
EVERETT, DH .
TRANSACTIONS OF THE FARADAY SOCIETY, 1955, 51 (11) :1551-1557
[9]   Analytical approximation of Preisach distribution functions [J].
Füzi, J .
IEEE TRANSACTIONS ON MAGNETICS, 2003, 39 (03) :1357-1360
[10]   Current transformer dimensioning for numerical protection relays [J].
Gangadharan, Pradeep Kumar ;
Sidhu, Tarlochan S. ;
Finlayson, Gregory James .
IEEE TRANSACTIONS ON POWER DELIVERY, 2007, 22 (01) :108-115