Title :
Optimal and adaptive compensation of voltage and current harmonics of nonlinear loads under nonstiff voltage conditions
Author_Institution :
Fac. of Electr. Eng., Sahand Univ. of Technol., Tabriz, Iran
Abstract :
In this paper operation of OFC based active power filters under nonstiff and distorted voltage conditions is investigated. Under these conditions there exist a feedback from the load currents to the load voltages hence this situation makes the OFC based system a closed loop adaptive system which may represent an unstable or poor transient response behavior. By identifying the source equivalent circuit an improved OFC algorithm (IOFC) has been proposed The proposed control algorithm considers the load voltages variation due to the load current variation. Successful performance of the proposed algorithm has been investigated and proved by several MATLAB based simulation studies. A new compensation strategy based on IOFC system which minimizes the load voltage harmonics has been proposed and investigated.
Keywords :
active filters; adaptive control; closed loop systems; equivalent circuits; feedback; optimal control; power harmonic filters; power system control; power system harmonics; transient response; IEEE-519; MATLAB based simulation; adaptive compensation; closed loop adaptive system; current harmonics; feedback; instability; load current variation; load currents; load voltage harmonics; load voltages; load voltages variation; nonlinear loads; nonstiff voltage conditions; optimal and flexible control strategy; optimal compensation; power factor; power quality; source equivalent circuit; transient response; voltage distortion; voltage harmonics; Active filters; Adaptive systems; Feedback loop; Filter bank; Impedance; Power harmonic filters; Power quality; Power system harmonics; Reactive power; Voltage;
Conference_Titel :
System Theory, 2003. Proceedings of the 35th Southeastern Symposium on
Print_ISBN :
0-7803-7697-8
DOI :
10.1109/SSST.2003.1194539
