Electricity: power supply or regulation systems – For reactive power control – Using converter
Patent
1991-09-10
1993-01-05
Beha, Jr., William H.
Electricity: power supply or regulation systems
For reactive power control
Using converter
307 45, 363 58, 363 96, H02M 7757
Patent
active
051774283
ABSTRACT:
An inverter control device that controls a self-commulated inverter connected to an AC power system via a three phase transformer and in so doing suppresses DC magnetization in the three-phase transformer. The device includes a current DC component detecting circuit for detecting the current DC components contained in at least two of the three phase output AC currents of the inverter and a DC magnetization suppressor signal generating circuit for producing two correcting signals from the current DC components. The two correcting signals are used to balance in amount the three voltage DC components contained in the three phase output AC voltage of the inverter, respectively. An output reference correcting circuit is provided to correct two of first output references in accordance with the two correcting signals and output three second references including the two corrected values and one of the first output reference. A gate control circuit controls the three phase output AC voltages of the inverter according to the three second output references.
REFERENCES:
patent: 4878026 (1989-10-01), Moreau et al.
Patent Abstracts Of Japan, vol. 14, No. 328, (E-952), Jul. 13, 1990, & JP-A-2-111-266, Apr. 24, 1990, K. Arai, "Controller of Inverter for System Interconnection".
Patent Abstracts Of Japan, vol. 10, No. 117, (E-400), May 2, 1986, & JP-A-60-249-874, Dec. 10, 1985, H. Kouno, et al., "Preventing Method of Irregular Magnetization of Transformer for Inverter".
Patent Abstracts of Japan, vol. 14, No. 297, (E-945), Jun. 27, 1990, & JP-A-2-095-179, Apr. 5, 1990, S. Sato, "Controlling of Inverter".
PCIM '88 Proceedings; pp. 343-351; "Application of a digital instantaneous current control for static induction thyristor converters . . . "; Hirose et al.
Hirose Syun-ichi
Inokuchi Haruhisa
Beha Jr. William H.
Kabushiki Kaisha Toshiba
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