WSEAS Transactions on Circuits and Systems
Print ISSN: 1109-2734, E-ISSN: 2224-266X
Volume 12, 2013
Stabilization of DC Link Voltage Using Redundant Vectors for Five-Level Diode Clamped Shunt Active Power Filter
Authors: , , ,
Abstract: In this paper, the control of DC link capacitor voltages of five-level diode clamped Active Power Filter (APF) using simplified Space Vector Pulse Width Modulation (SVPWM) associated with the redundant vectors of this topology is proposed. The space vector diagram of the five-level inverter is simplified into that of three-level inverter. In turn, the three-level inverter space vector diagram is simplified into that of two-level inverter. Thus, the algorithm of five-level SVPWM becomes very similar to that of conventional two-level inverter SVPWM. Concerning the self stabilization of dc link capacitor voltages, on the base of position of reference voltage vector in space vector diagram, we explain how to choose switching states that will be used to generate the output voltages. The redundancies of some switching states are thoughtfully used to cancel imbalance of dc link capacitor voltages, on the base of a closed loop that use measurements of input and output currents of the APF. The performance of the proposed redundant vector algorithm associated with sliding regulator used to control the shunt APF is illustrated through the compensation of harmonic currents and reactive power produced by a non-linear load in medium voltage network.
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Keywords: Active Power Filter, Harmonic current, Five-level inverter, Space Vector Pulse Width Modulation (SVPWM), DC source balancing, Redundant vectors