Active capacitor voltage stabilisation in a medium-voltage flying-capacitor multilevel active filter
Date
2005-03
Authors
Hansmann, Chirstine Henriette
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : University of Stellenbosch
Abstract
A switching state substitution must be developed that will make use of both single-phase
redundancies and three-phase redundancies in the flying-capacitor topology. Losses should
be taken into consideration and the algorithm must be designed for implementation on the
existing PEC33 system, with on-board DSP (TMS320VC33) and FPGA (EP1K50QC208).
The specific power-electronics application is a medium-voltage active filter.
Existing capacitor voltage stabilisation schemes are investigated and a capacitor-voltage
based algorithm is developed that is investigated in parallel with the Donzel and Bornard
algorithm. Detailed simulation models are built for the evaluation of both existing and the
proposed algorithm. Three-phase control is also evaluated.
Timing analysis of the proposed algorithm shows that a DSP-only implementation of the
proposed capacitor-based solution is not feasible. Detail design of the digital controller
hereof is implemented in VHDL. Finally, a four-cell controller is fitted into the FPGA. A
scalable hardware sorting architecture is utilised.
Description
Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2005.
Keywords
Active electric filters, Switched capacitor circuits, Electric current converters, Dissertations -- Electrical engineering, Theses -- Electrical engineering