Abstract
This paper outlines a new approach for the compensation of power systems presented through the use of a unified power quality conditioner (UPQC) which compensates impulsive and oscillatory electromagnetic transients. The newly proposed control technique involves a dual analysis of the UPQC where the parallel compensator is modelled as a sinusoidal controlled voltage source, while the series compensator is modelled as a sinusoidal controlled current source, opposed to the traditional approach where the parallel and series compensators are modelled as current and voltage nonsinusoidal sources, respectively. Also a new compensation algorithm is proposed through the application of the theory of generalized reactive power; this is then compared with the theory of active and reactive instantaneous power, orpqtheory. The results are presented by means of simulations in MATLAB-Simulink®.
Highlights
One of the main problems with power quality is the increase of electronic devices, which require a high level of waveform voltage quality to operate properly at both residential and industrial levels [1]
This combination allows the simultaneous compensation in the source current side via the parallel compensator and the load voltage side with the series compensator, isolating the system of power quality problems generated from the load and the load of problems from the source
The simulated iUPQC is composed of a DC bus with split capacitor; the switching pulses are generated by PID discrete controllers compared with 20 kHz triangular signals
Summary
One of the main problems with power quality is the increase of electronic devices, which require a high level of waveform voltage quality to operate properly at both residential and industrial levels [1]. The capacitor-switching transients, or CST, constitute the most common cause of surge voltage, followed only for lightning in most systems [3] These transients cause misoperation or faults in devices at both residential and industrial levels; this problem of power quality has recently gained more attention due to devices that use solid state electronics and are more sensitive to surges than their predecessors [4]. This combination allows the simultaneous compensation in the source current side via the parallel compensator and the load voltage side with the series compensator, isolating the system of power quality problems generated from the load and the load of problems from the source
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