In this paper, we propose a combined Online Feedback Optimization (OFO) and dynamic estimation approach for real-time power grid operation under time-varying conditions. A uses measurements to generate the information required by an OFO controller, that incrementally steers controllable injections set-points towards solutions of AC Optimal Power Flow (AC-OPF) problem. More concretely, quadratic...

We present a class of linear programming approximations for constrained optimization problems. In the case of mixed-integer polynomial optimization problems, if the intersection graph of the constraints has bounded tree-width our construction yields a class of linear size formulations that attain any desired tolerance. As a result, we obtain an approximation scheme for the “AC-OPF” problem on g...

This paper introduces the severity of load (SOL) index technique for finding the optimal location of facts devices to achieve the optimal power flow. Objective function in the OPF, that is to be minimised, are overall cost functions which includes the total active power generation cost function. Among various controllers TCPST is considered and optimal location facts device is determined for im...

As part of an extensive research programme to combine the benefits of method engineering and existing object-oriented frameworks (notably the OPF) to create a highly supportive methodological environment for the construction of agent-oriented information systems, we have analysed-hess; contributions to the OPF repository of process components from the Prornertrcus ··agent-mienred methodology. W...

This paper deals with the, AC power flow approximation has been used to calculate new real Power Transmission Congestion Distribution Factors (PTCDFs), considering the presence of an UPFC. These factors have been utilized to form the single and multiple zones for the congestion management. The UPFC has been optimally placed in the system based on the factors, called as Line Loading Distribution...

This paper addresses the globally optimal solution of the network-constrained unit commitment (NCUC) problem incorporating a nonlinear alternating current (AC) model of the transmission network. We formulate the NCUC as a mixed-integer quadratically constrained quadratic programming (MIQCQP) problem. A global optimization algorithm is developed based on a multi-tree approach that iterates betwe...

FOREWORD Optimal power flow (OPF) calculations are increasingly critical to modern power systems operationcontrol, markets and planning. However, it is still not easy to obtain reliable OPF solutions that are fully usable in practical power systems engineering. Better methods and software are continually being pursued. This paper discusses some of the calculation and solution requirements from ...

In this study, lignocellulosic biomass from oil palm trunk (OPT) and oil palm frond (OPF) of oil palm tree, Elaeis guineensis, were treated using the microwave-alkali (Mw-A) method, and their chemical constituents, namely cellulose, hemicellulose, and lignin, were analyzed. A number of instruments, i.e. FESEM, FT-IR, and XRD, were employed to analyze the morphology and structural changes of bio...

The ultimate goal of this work was to develop a biocompatible and biomimetic in situ crosslinkable hydrogel scaffold with an instructive capacity for bone regenerative treatment. To this end, synthetic hydrogels were functionalized with two key components of the extracellular matrix of native bone tissue, i.e. the three-amino acid peptide sequence RGD (which is the principal integrin-binding do...

Abundant sources of palm oil based biomass provide an impetus for the sustainable generation of biofuel. Biomass such as palm oil agro-plantation waste are emerging as a promising sources of renewable liquid fuels, hence, in order to investigate the potentials of using oil palm frond juice (OPF) as feedstock for solvent production ,nutrient and sugar contents analysis was examined. A total solv...