Control schemes for DC capacitor voltages equalization in diode-clamped multilevel inverter-based DSTATCOM
MetadataShow full item record
This paper examines the application of a diodeclamped multilevel inverter (DCMLI)-based distribution static compensator (DSTATCOM) connected to a three-phase, four-wire (3p4w) distribution system. The DCMLI has an inherent unbalancing problem among its dc capacitor voltages. Additionally, when the load contains a dc part, the neutral point of the compensator also becomes unbalanced. In this paper, the effects of different loading conditions on the dc capacitor voltages of the inverter are studied. Two new control circuits are proposed for equalizing the capacitor voltages. Different control techniques are presented for the equalizing circuits. Equations of the proposed equalizing controllers are developed corresponding to the control of the switching devices. Comparative studies of different controltechniques and the performances of the two controllers are performed. Simulation studies are performed using PSCAD/EMTDC to validate the efficacy of the proposed equalizing controller circuits.
Showing items related by title, author, creator and subject.
Flying-capacitor-based chopper circuit for dc capacitor voltage balancing in diode-clamped multilevel inverterShukla, A.; Ghosh, Arindam; joshi, A. (2010)This paper proposes a flying-capacitor-based chopper circuit for dc capacitor voltage equalization in diode-clamped multilevel inverters. Its important features are reduced voltage stress across the chopper switches, ...
A novel CDVM based high-voltage converter using low power solid-state switches and a tuned resonant circuit designed for pulsed power applicationsZabihi, S.; zare, F.; Ledwich, G.; Ghosh, Arindam; Zabihi, Z. (2012)A novel concept of producing high dc voltage for pulsed-power applications is proposed in this paper. The topology consists of an LC resonant circuit supplied through a tuned alternating waveform that is produced by an ...
Juanuwattanakul, Parachai (2012)Voltage instabilities and subsequent system collapses are considered as growing concerns in modern multiphase distribution networks as they are progressively forced to operate closer to their stability limits due to many ...