Control and Performance of a Transformerless Cascade PWM STATCOM With Star Configuration

This paper presents a three-phase transformerless cascade pulsewidth-modulation (PWM) static synchronous compensator (STATCOM) intended for installation on industrial and utility power distribution systems. It proposes a control algorithm that devotes itself not only to meeting the demand of reactiv...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2007-07, Vol.43 (4), p.1041-1049
Main Authors: Akagi, H., Inoue, S., Yoshii, T.
Format: Article
Language:English
Subjects:
Automatic voltage control
Capacitors
Cascade connection
Cascade control
Control theory
Direct current
Electric potential
Electrical equipment industry
Galvanizing
multilevel converters
Power distribution
Pulse duration modulation
Pulse transformers
Pulse width modulation
Reactive power
Reactive power control
Space vector pulse width modulation
Stars
STATic synchronous COMpensator (STATCOM)
Voltage
voltage balancing
Voltage control
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Description
Summary:This paper presents a three-phase transformerless cascade pulsewidth-modulation (PWM) static synchronous compensator (STATCOM) intended for installation on industrial and utility power distribution systems. It proposes a control algorithm that devotes itself not only to meeting the demand of reactive power but also to voltage balancing of multiple galvanically isolated and floating dc capacitors. The control algorithm based on a phase-shifted carrier modulation strategy is prominent in having no restriction on the cascade number. Experimental waveforms verify that a 200-V 10-kVA cascade PWM STATCOM with star configuration has the capability of inductive to capacitive (or capacitive to inductive) operation at the rated reactive power of 10 kVA within 20 ms while keeping the nine dc mean voltages controlled and balanced even during the transient state.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2007.900487