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Cascaded multilevel control of DSTATCOM using multiband hysteresis modulation

By Arindam Ghosh, Avinash Joshi and Rajesh Gupta


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

Topics: Cascaded topology, DSTATCOM, multiband, multilevel bridge circuits, cascade control, compensation, power capacitors, power distribution control, static VAr compensators
Publisher: IEEE
Year: 2006
OAI identifier: oai:eprints.qut.edu.au:9330

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