Research on Constant Frequency Electrical Angle Start Method of LCI

Abstract:

Load-commutated inverters (LCIs) are the key starting device of wound-field synchronous motor. By detecting the rotor position and inputting a variable frequent current to the stator windings, the LCI can drive the motor from standstill to a given speed. Thus, rotor position detecting method comes to be the key techniques, but at the ultra-low speed period, the motor’s terminal voltage is too low to accurately sampling and is vulnerable to the interference, which brings risks to the variable frequency driving. In this paper, through analyzing the principles of LCIs and synchronous machine, a constant frequency electrical angle control methods is introduced to solve the difficulty of detecting the rotor position in the low speed period. A 98MW synchronous machine driven with an 18MW LCI are experimented in MATLAB and RTDS systems, the results show that the proposed control strategy can realize soft-start of the wound-field synchronous motor without detecting rotor’s position.

• Periodical: Advanced Materials Research (Volumes 1070-1072)
• Pages: 1258-1262
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1070-1072.1258
• Online since: December 2014
• Authors: Lian Tao Ji*, De Shun Wang, Bin Yu, Shang Lin Zhao, Ai Liang Kong, Xin Long Zhang, Gui Gang Han
• Keywords: Constant Frequency Angle, Load-Commutated Inverters (LCIs), Low Speed Control, Medium-Voltage Motor, Rotor Position Detect

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DOI: 10.4028/www.scientific.net/amr.608-609.1120