Title :
Control technique for non-linear and unbalance compensation of an integrated magnetics-based three-phase series-shunt-compensated uninterruptible power supply
Author :
Roy, Sandip ; Umanand, L.
Author_Institution :
Centre for Electron. Design & Technol., Indian Inst. of Sci., Bangalore, India
fDate :
1/1/2012 12:00:00 AM
Abstract :
Handling unbalanced and non-linear loads in a three-phase AC power supply has always been a difficult issue. This has been addressed in the literature by either using fast controllers in the fundamental rotating reference frame or using separate controllers in reference frames specific to the harmonics. In the former case, the controller needs to be fast and in the latter case, besides the need for many controllers, negative-sequence components need to be extracted from the measured signal. This study proposes a control scheme for harmonic and unbalance compensation of a three-phase uninterruptible power supply wherein the problems mentioned above are addressed. The control takes place in the fundamental positive-sequence reference frame using only a set of feedback and feed-forward compensators. The harmonic components are extracted by a process of frame transformations and used as feed-forward compensation terms in the positive-sequence fundamental reference frame. This study uses a method wherein the measured signal itself is used for fundamental negative-sequence compensation. As the feed-forward compensator handles the high-bandwidth components, the feedback compensator can be a simple low-bandwidth one. This control algorithm is explained and validated experimentally.
Keywords :
compensation; feedforward; nonlinear control systems; power system control; uninterruptible power supplies; feedback compensator; feedforward compensator; fundamental positive-sequence reference frame; fundamental rotating reference frame; high-bandwidth component; integrated magnetics-based uninterruptible power supply; negative-sequence component; nonlinear control technique; positive-sequence fundamental reference frame; signal measurement; three-phase AC power supply; three-phase series-shunt-compensated uninterruptible power supply; unbalance compensation;
Journal_Title :
Power Electronics, IET
DOI :
10.1049/iet-pel.2011.0110