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We verified that a large selective breaking capacity could be ensured without using high-performance breakers by conducting breaking tests as a distribution board rather than making the selection based on the catalog specifications of the breaker manufacturer when selecting a breaker for distribution boards in data centers.
This paper presents a novel zero-crossing point detection method for boundary current mode PFC converter. In the conventional boundary current mode, the zero-crossing point is detected by observing the inductor voltage. When the digital controller is used in the conventional method, the detection of the zero-crossing point is delayed due to the delay time caused by the processing of DSP. And the detection...
This paper presents a harmonic current injection control for active islanding detection of grid-connected inverters. A standardized islanding detection method called frequency feedback method with step reactive power injection is used in the inverter system for islanding detection. After an islanding event, this method measures the change of voltage harmonic distortion and injects reactive power to...
This paper presents a random frequency hopping with triangular ramp control for harmonic reductions in a dc-dc converter. The relationship between “the sawtooth and triangular ramp signals” and the inductor current is analyzed, and the two ramp signals are implemented into the converter to compare the variation of output voltage. When the switching frequency hops, using triangular ramp keeps the small...
The authors have proposed the single-stage bidirectional buck AC/DC converter. This paper shows the size and efficiency of the proposed single-stage buck AC/DC converter using SiC MOSFET in comparison with conventional two-stage buck AC/DC converter using Si IGBT. AC current harmonics, DC voltage ripples and efficiency are evaluated in single-stage converter and two-stage converter by experiments.
Utility-interactive photovoltaic power generations have been accepted and spread widely. Various innovative power conditioning systems have been also studied. In domestic utilization, the actual application of such solar panels is almost installed on top of the roof of the detached house. However, some residents living in the apartment house are having fairly strong desire to contribute for energy...
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