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New Reference Generation for a Single-Phase Active Power Filter to Improve Steady State Performance
이지헌,정종규,배병열,한병문 전력전자학회 2010 JOURNAL OF POWER ELECTRONICS Vol.10 No.4
This paper proposes a new algorithm to generate a reference signal for an active power filter using a sliding-window FFT operation to improve the steady-state performance of the active power filter. In the proposed algorithm the sliding-window FFT operation is applied to the load current to generate the reference value for the compensating current. The magnitude and phaseangle for each order of harmonics are respectively averaged for 14 periods. Furthermore, the phase-angle delay for each order of harmonics passing through the controller is corrected in advance to improve the compensation performance. The steady-state and transient performance of the proposed algorithm was verified through computer simulations and experimental work with a hardware prototype. A single-phase active power filter with the proposed algorithm can offer a reduction in THD from 75% to 4% when it is applied to a non-linear load composed of a diode bridge and a RC circuit. The active power filter with the proposed reference generation method shows accurate harmonic compensation performance compared with previously developed methods,in which the THD of source current is higher than 5%.
Operation Analysis of a Communication-Based DC Micro-Grid Using a Hardware Simulator
이지헌,김현준,한병문 전력전자학회 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.2
This paper describes the operation analysis results of a communication-based DC micro-grid using a hardware simulator developed in the lab. The developed hardware simulator is composed of distributed generation devices such as wind power,photovoltaic power and fuel cells, and energy storage devices such as super-capacitors and batteries. Whole system monitoring and control was implemented using a personal computer. The power management scheme was implemented in a main controller based on a TMS320F28335 chip. The main controller is connected with the local controller in each of the distributed generator and energy storage devices through the communication link based on a CAN or an IEC61850. The operation analysis results using the developed hardware simulator confirm the ability of the DC micro-grid to supply the electric power to end users.
Effects of Social Media Utilization on Labor Union Social Capital in South Korea
이지헌,정회경 한국인터넷방송통신학회 2017 Journal of Advanced Smart Convergence Vol.6 No.2
This study delved into the effects of labor union members’ social media utilization for the formation of labor union social capital. Specifically, this study aimed to identify the effects of labor union-related social media use and participation on the labor union’s social capital formation through quantitative and qualitative research. It set up trust, network, and participation as social capital components and as dependent variables. Network, in particular, was divided into bonding and bridging aspect. There is the correlation between labor union-related social media use and the formation of labor union social capital. As participation in the group type social media operated by a labor union becomes more active, evaluation on labor union social capital throughout trust, network, and participation is higher. Especially, the correlation between bonding network and bridging network was high. This proves that a labor union’s bond enhancement does not result in the labor union’s selfishness, but it can build a cooperative system with an external network.