Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
2007-02-27
2007-02-27
Berhane, Adolf (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C363S055000
Reexamination Certificate
active
11368480
ABSTRACT:
To suppress a DC component in AC power in a power converter for converting DC power to AC power. DC power is converted to AC power by a converter2, and the AC power is supplied to output terminals u1and u2via an inductor3. The converter2is controlled based on an error Δ(t) between an output current ip(t) outputted from the converter2and a target current j(t) outputted from a target current generation means110as a target value for the output current ip(t), and a DC component VDin an output terminal voltage v(t) is detected by a voltage detection means18. A DC component IDis suppressed by correcting a target current j(t) by a DC component suppression means8. Also, a DC component in the AC power is suppressed to prevent biased magnification of a transformer4by calculating a correction amount jh(t) for correcting the target current j(t) from the difference between a first instantaneous value d1of a load current is(t) flowing to a load4at a first time point t1and a second instantaneous value d2of the load current is(t) at a second time point t2that is a half cycle after the first time point to correct the target current j(t).
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Masaaki Ohshima, entitled “Current Error Tracking Mode AC Current Waveform Control Method for Single Phase Self Commutated Voltage Source Power Converters”, T.IEE Japan, vol. 114-D, No. 3. '94, pp. 289-298.
Masaaki Ohshima et al., entitled “A Novel Three-Phase UPS Inverter Driven by Error-Tracking-Mode PWM Scheme”, IEEJ Trans. IA, vol. 125, No. 2, 2005, pp. 164-173.
Ohshima Masaaki
Shimizu Hirokazu
Ushiki Shuichi
Berhane Adolf
Origin Electric Company Limited
The Tokyo Electric Power Company Incorporated
Wenderoth , Lind & Ponack, L.L.P.
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