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Series DC Arc Fault Detection Algorithm for DC Microgrids Using Relative Magnitude Comparison
Chae, Suyong,Park, Jinju,Oh, Seaseung IEEE 2016 IEEE journal of emerging and selected topics in po Vol.4 No.4
<P>This paper describes a detection algorithm for series dc arc faults to improve safety issues in dc microgrids. Series arc faults typically occur when gaps form in a current-flowing wire or contactor. Arc faults can create serious fire hazards if not detected and removed in a short time. To identify series arc faults accurately and quickly in dc microgrids, a series dc arc fault detection algorithm using relative magnitude comparison is proposed. The proposed algorithm detects the time of occurrence of an arc fault based on the magnitudes of the load current in both the time and frequency domains simultaneously. The algorithm accurately works in a dc microgrid with multiple switching converters, as it relies only on relative current information. The proposed detection algorithm is experimentally verified on a 5-kW 380 V dc microgrid prototype with an arc fault generation unit.</P>
Digital Current Sharing Method for Parallel Interleaved DC–DC Converters Using Input Ripple Voltage
Suyong Chae,Yujin Song,Sukin Park,Hakgeun Jeong IEEE 2012 IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS - Vol.8 No.3
<P>This paper describes a new digital current sharing method for parallel interleaved dc-dc converters. The difference between sensed inductor current values can cause unequal current distribution in the parallel dc-dc converters even though they are controlled by the same average current mode controller with a common current reference. To overcome this problem, a simple digital current sharing algorithm using input voltage ripple difference is proposed. The digital current sharing algorithm calculates the required current reference adjustment value using only the input ripple voltage difference information. No additional input current sensing circuit is required. The proposed algorithm achieves equal current distribution between phases of the parallel converters with high parameter insensitivity. For the experimental verification, a 500 W two phase interleaved synchronous buck dc-dc converter which charges a 24 V Li-ion battery is implemented.</P>