Implementation of a Smart Power Conditioning System for Energy Storage System with a Novel Seamless Transfer Strategy

Ki-Ryong Kim, Chang-Yeol Oh, Tae-Jin Kim, Jong-Pil Lee and Hee-Je Kim
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Ki-Ryong Kim: Department of Electrical Engineering, Pusan National University, Geumjeong-gu, Busan 46241, Korea
Chang-Yeol Oh: Power Conversion and Control Research Center, HVDC Research Division, Korea Electrotechnology Research Institute, Seongju-dong, Changwon-si, Gyeongsangnam-do 51543, Korea
Tae-Jin Kim: Power Conversion and Control Research Center, HVDC Research Division, Korea Electrotechnology Research Institute, Seongju-dong, Changwon-si, Gyeongsangnam-do 51543, Korea
Jong-Pil Lee: Power Conversion and Control Research Center, HVDC Research Division, Korea Electrotechnology Research Institute, Seongju-dong, Changwon-si, Gyeongsangnam-do 51543, Korea
Hee-Je Kim: Department of Electrical Engineering, Pusan National University, Geumjeong-gu, Busan 46241, Korea

Energies, 2018, vol. 11, issue 5, 1-17

Abstract: Implementation of a smart power conditioning system with a novel seamless transfer method for an energy storage system (ESS) was proposed in this paper. The power conditioning system is to control the power quality or protect the grid system. Therefore, it requires various functions. One of the these functions, the uninterruptible power supply (UPS) function, was applied to proposed power conditioning system. In order for the grid-interactive power conditioning system to continuously supply power to the load, two operation modes are required depending on the grid state. One is the grid connected (GC) mode and the other is the stand-alone (SA) mode. Under normal grid condition, the power conditioning system is operated in GC mode and controls the current. On the other hand, under abnormal grid conditions such as grid outage, the power conditioning system operates in SA mode and supplies power to the load. Unintentional sudden changes in operating mode cause unwanted phenomena (e.g., voltage/current spike, inrush current) which can make system degradation or failure. To improve this situation, the seamless transfer function became necessary. In this paper, by adding seamless function to power conditioning system, it is possible to supply power to the load stably regardless of grid state. In addition, it is possible to prevent secondary accident and to operate stably even if non-detection zone condition occurs by using an active frequency method. The proposed control algorithm was verified through field experiments.

Keywords: power conditioning system; seamless transfer; voltage source inverter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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