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This paper demonstrates on the development of weak bus identification method using novel reactive power tracing index for determination and selection on appropriate buses for load shedding purpose. Power tracing principles using downstream looking algorithm is utilized for the development of a novel reactive power tracing index known as LQP_LT. The results obtained from the weak bus identification...
Smart grid is a concept by which the existing electrical grid infrastructure is being upgraded with integration of multiple technologies such as, two-way power flow, two-way communication, automated sensors, advanced automated controls and forecasting system. Smart grid enables interaction between the consumer and utility which allow the optimal usage of energy based on environmental, price preferences...
This paper presents an investigation on the various faults that a bi-directional AC-DC/DC-AC converter linking a DC microgrid to the main AC grid may encounter. In addition, the protection of this converter against line-line, line-ground, one phase open and DC bus faults is developed, presented and discussed. The converter proved to be a very effective tool to transfer any desired amount of power...
This paper presents a new energy management system (EMS) for small hybrid electric vehicle (HEV), which utilizes energy from the combination of battery, fuel cell (FC) and super capacitors (SC). These alternative energy sources are excellent potential solution to the ever-rising price of petrol. The major focus of this paper is the energy management system, which consists of a strategy to coordinate...
This paper presents a simulation modeling for the hardware development of photovoltaic three-phase voltage source inverter utilizing dSPACE DS1104 controller platform. The controller links the MATLAB/Simulink simulated model to the inverter prototype for operation in real-time. It generates a sinusoidal pulse-width modulation (SPWM) signals for switching devices (IGBTs) with the accomplishment of...
In this research an iterative method for determining the optimal sizing of standalone photovoltaic (PV) system in terms of optimal sizing of PV array and battery storage is proposed. A standalone PV system energy flow is first analysed using a developed model for a standalone PV system. In finding the optimal size of PV array and battery, a long term data (1975–2005) is considered for Malaysia. Based...
microgrid systems is a new technology for improving reliability and providing alternative energy supplies to the grid system. Low voltage faults in the system are one of the critical issues that require distributed generating sources to disconnect from grid provide energy to the load. Therefore the techniques used in the micro grid system with micro soures can be important in reducing the problems...
This paper proposes a new method to manage the daily operation of MicroGrid (MG) for residential applications. Thorough discussion and simulations are conducted to clarify and highlight the principle of the method. Nonlinear optimization problem formulation is also performed. The proposed cost function takes into consideration the costs of the emissions NOx, SO2, and CO2 as well as the operation and...
This paper presents and describes a smart predictive technique for managing reactive power from a numbers of distributed generation (DG) units connected to low voltage (LV) buses in a distribution network. The technique applies an optimization process in the first stage and in the second stage the procedure is generalized using artificial neural network (ANN). The ANN is trained to replace the role...
Voltage sag and swell are the common problem for sensitive load. The impact range from load disruptions to substantial economic losses. The DVR is the best solution to protect the sensitive loads. This paper present a fast DVR with controller to compensate the short outage, reduced the harmonic distortion and transient voltage for balanced and unbalanced load. In-phase method with continues two vector...
This paper presents modeling and simulation of a grid connected photovoltaic (PV) system with maximum power point tracking (MPPT) using a novel fuzzy logic controller (FLC). The system composed of a PV array, boost converter with MPPT and a three phase inverter connected to utility grid. The MPPT is based on fuzzy logic to control IGBT switch of the boost converter. The performance of the proposed...
In this paper the operation of 50 kW PEM fuel cell system as distributed generation is studied. The objective of this work is to develop the modeling and control framework for such distributed generation to enable their operation in a distribution system. A new control strategy for the operation of the fuel cell system in both grid connected and islanded modes is proposed to enable better management...
This paper deals with the modeling of synchronous static compensator (STATCOM) of a power system based on dynamic phasor model to investigate the performance of STATCOM for power quality analysis and compared with EMTP like simulation. The dynamic phasor model and EMT model of the STATCOM including the system is implemented in Matlab/Simulink toolbox and PSCAD/EMTDC, respectively. Details dynamic...
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