Cascaded multilevel control of DSTATCOM using multiband hysteresis modulation

Ghosh, Arindam, Joshi, Avinash, & Gupta, Rajesh (2006) Cascaded multilevel control of DSTATCOM using multiband hysteresis modulation. In IEEE Power Engineering Society General Meeting, 2006, 18-22 June 2006, Montreal, Canada.

Abstract

In this paper a cascaded H-bridge inverter topology is used in a distribution static compensator (DSTATCOM). A new multiband hysteresis algorithm is used to control the switches of the cascaded H-bridges leading to multilevel output of the inverter. The algorithm requires hierarchal switching of each H-bridge. Sequential change in the hierarchy facilitates equal charging and discharging of each capacitor. This leads to self-balancing of voltage across the capacitors. The multiband hysteresis algorithm is robust even under unequal capacitor voltages due to the dissimilarity in the H-bridge and capacitor units. The use of a resonant controller provides good tracking of the fundamental component of reference current. Discrete sampling of the switching function limits the switching frequency of the semiconductor devices. A 7-level cascaded inverter topology is considered for shunt compensation of an 11-kV distribution system. The results are validated through PSCAD/EMTDC simulation software.

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ID Code: 9330
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: Cascaded topology, DSTATCOM, multiband, multilevel bridge circuits, cascade control, compensation, power capacitors, power distribution control, static VAr compensators
ISBN: 1424404932
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2006 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 04 Sep 2007 00:00
Last Modified: 10 Aug 2011 15:01

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