Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1986-11-20
1988-03-01
Wong, Peter S.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
363 88, 363 96, H02M 112
Patent
active
047290820
ABSTRACT:
The invention relates to the control of a power converter in which the AC side is connected through a reactor to an AC power supply while the DC side is connected to a smoothing capacitor and a load and the power rectification and the power inversion are carried out by the pulse width modulation control. The controls performed include (1) the control, whereby the voltage across the smoothing capacitor coincides with a predetermined value and the current flowing through the reactor and the voltage of the AC power supply have a predetermined phase relationship; (2) the DC component compensation control for eliminating the DC component in an AC circuit within a short time interval and (3) the control of the power conversion operation by utilizing a microprocessor while suppressing the higher harmonics in the AC power supply. The control (1) is performed by using an amplitude signal of the voltage on the AC side of the power converter and a phase difference signal relative to the AC power supply voltage. The control (2) is performed by using the amplitude signal and the phase signal on the AC side of the power converter which cause the current flowing through the reactor to have a predetermined phase relationship with the AC power supply voltage and a detected DC component signal flowing through an AC circuit. The control (3) is performed by using the data of degree of modulation and the phase angle data which are fixed value during a certain period of time and the cross point data stored in the storage means.
REFERENCES:
patent: 4247888 (1981-01-01), Angquist
patent: 4315305 (1982-02-01), Siemon
patent: 4386394 (1983-05-01), Kocher et al.
IEEE Transactions on Industry Applications, vol. IA-16, No. 2, (1980); "Converter Propulsion Systems with Three-Phase Induction Motors for Electric Traction Vehicles".
Kabushiki Kaisha Toshiba
Wong Peter S.
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