Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1998-04-29
1999-05-25
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 51, 363 98, 363132, H02H 7122, H02H 700, H02M 324, H02M 75387
Patent
active
059074833
ABSTRACT:
A control system for a power conversion system, composed of at least one voltage source type converter and a transformer. The control system includes, a circuit for detecting line-to-line voltages of an AC power source, an instantaneous phase detecting circuit for detecting instantaneously a phase angle of a phase voltage of the AC power source based on the line-to-line voltages of the AC power source, a circuit for detecting AC currents outputted from the power conversion system, a first coordinate transformation circuit for converting AC currents into an active current detected value and a reactive current detected value in a coordinate determined by a phase voltage vector of the AC power source using the phase angle, a current control circuit for generating output signals based on a current control result, a second coordinate transformation circuit for converting the output signals of the current control circuit into two-phase signals in a static coordinate system using the phase angle, a pulse width modulation control circuit for generating pulse width modulated signals, based on a pulse width modulation control result, and a circuit for generating gate pulses based on the pulse width modulated signals.
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Iio Naotaka
Yamamoto Hajime
Kabushiki Kaisha Toshiba
Vu Bao Q.
Wong Peter S.
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