Title :
A new control strategy for instantaneous voltage compensator using 3-phase PWM inverter
Author :
Lee, S.Y. ; Chae, Y.M. ; Cho, J.-S. ; Choe, G.H. ; Mok, H.S. ; Jang, D.-H.
Author_Institution :
Dept. of Electr. Eng., Kon-Kuk Univ., Seoul, South Korea
Abstract :
In a three-phase power system, unbalanced voltage with harmonics can be detected on the synchronous reference frame. Assuming that there is no neutral path in the power system, an unbalanced voltage with harmonic components has a DC component, a 2nd harmonic and the other harmonic components. Therefore, it is possible to compensate unbalanced voltage and harmonic voltage by cancelling the harmonic components, exclusive of the DC component on the d-q axis. In addition, by adjusting the value of the DC component obtained from positive sequences, the regulation of load voltage is achieved. This paper presents an algorithm performing compensation of unbalanced and harmonic voltage as well as maintaining the constant voltage in the load side. The compensating characteristics of the proposed instantaneous voltage compensator are also discussed
Keywords :
DC-AC power convertors; PWM invertors; compensation; control system analysis; control system synthesis; harmonic distortion; load (electric); power system harmonics; voltage control; DC component; compensating characteristics; control strategy; d-q axis; harmonic components; instantaneous voltage compensator; load voltage regulation; synchronous reference frame; three-phase PWM inverter; unbalanced voltage; Frequency conversion; Impedance; Power filters; Power generation; Power harmonic filters; Power system harmonics; Pulse width modulation inverters; Static power converters; Switches; Voltage control;
Conference_Titel :
Power Electronics Specialists Conference, 1998. PESC 98 Record. 29th Annual IEEE
Print_ISBN :
0-7803-4489-8
DOI :
10.1109/PESC.1998.701907
