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Journal of the Korean Institute of Illuminating and Electrical Installation Engineers

ISO Journal TitleJ Korean Inst. IIIum. Electr. Install. Eng.
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Title The Study on Sag Detecting Scheme around Zero Crossing Voltage for Single-Phase Inverter System
Authors Woo-Cheol Lee
DOI http://dx.doi.org/10.5207/JIEIE.2014.28.1.096
Page pp.96-104
ISSN 1225-1135
Keywords PLL(Phase Locks Loop) ; All-Pass Filter(APF) ; Difference Voltage ; Zero Crossing Voltage
Abstract The all pass filter generates a virtual q-axis voltage component with 90° phase delay but the virtual q-axis voltage cannot detect the voltage depending on the phase of the grid voltage. To overcome the problem, q-axis voltage component is generated from difference between the current and previous value of d-axis voltage component in the stationary reference frame. However, the difference voltage between the current and previous value around the zero crossing voltage is not enough to detect the voltage sag. Therefore, the new detection scheme which can detect the sag around the zero crossing voltage is proposed.