Piracy and Maritime Terrorism; A Seamless Transition

Abstract Renewable energy resources based hybrid microgrid has emerged as a significant component of the power system. Nevertheless, the control and management of power, voltage and frequency under transition between grid-connected mode (GCM) and islanded mode (IM) is a major concern. This paper proposes a self-sustained and flexible novel cooperative control strategy (CCS) for smart hybrid microgrid (SHMG) under GCM and IM mode operations. In islanded operation of SHMG, conventional droop offers ease of control but its execution with seamless transition between operating modes poses poor voltage regulation and frequency deviation. For this purpose, an intelligent cooperative controller is proposed. It consists of a modified P/f-Q/V droop control (MDC) algorithm along with soft computing based VF-controller unit (VFCU). The proposed control scheme is implemented to regulate voltage and frequency. It also enhances the power quality with unbalanced non-linear load and source intermittencies. The absence of a communication link reduces cost and also eliminates the risk of single point breakdown. The SHMG has been simulated in MATLAB and implemented in real-time. The obtained experimental results demonstrate the competency and high robustness of the proposed scheme.

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Seamless Transition of PV-BES Microgrids with Power Quality Improvement Capability

10.1109/gucon50781.2021.9573989 ◽

2021 ◽

Author(s):

Pavitra Shukl ◽

Bhim Singh

Keyword(s):

Quality Improvement ◽

Power Quality ◽

Seamless Transition ◽

Power Quality Improvement

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PANS Turbulence Model for Seamless Transition Between RANS and LES: Fixed-Point Analysis and Preliminary Results

Volume 2: Symposia, Parts A, B, and C ◽

10.1115/fedsm2003-45336 ◽

2003 ◽

Cited By ~ 40

Author(s):

Sharath S. Girimaji ◽

Ravi Srinivasan ◽

Euhwan Jeong

Keyword(s):

Fixed Point ◽

Navier Stokes ◽

Control Parameters ◽

Preliminary Results ◽

Point Analysis ◽

Large Eddy ◽

Seamless Transition ◽

Bridging Model ◽

Reynolds Averaged Navier Stokes ◽

Initial Results

Partially-averaged Navier-Stokes (PANS) approach has been recently developed as a possible bridging model between Reynolds-averaged Navier-Stokes (RANS) method and large-eddy simulations (LES). The resolution control parameters in PANS are the fractions of unresolved kinetic energy (fk) and unresolved dissipation (fε). We investigate the fixed-point behavior of PANS and present some preliminary results obtained using this model. By comparing the fixed-point behavior of PANS and URANS (unsteady Reynolds-averaged Navier-Stokes) methods, the possible advantage of the former over the latter is explained. Initial results from two-dimensional simulations of flow past square results are also presented.

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