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One of the transformer's parameters which has a significant impact on the residual life of a fault-free power transformer is the condition of the paper insulation on its windings. Kraft and Kraft thermally upgraded paper is mostly used as insulation around the copper turns of the winding. Over time, chemical reactions involving water degrade the paper causing it to become brittle. The paper's theoretical...
From electricity point of view, the Australia's state of Queensland is part of the NEM (National Electricity Market) and its electricity grid is connected to the electricity network of other Southern and Eastern states of Australia (New South Wales, Victoria, and South Australia). A large amount of electricity delivered to North and Far North of Queensland state is produced in South and Central part...
With the uptake of intermittent renewable generation (namely wind and solar), the battery storage market is now growing and generation in modern power systems is becoming more distributed and behind-the-meter. Utilities are investigating ways to provide incentives to encourage end-users to participate in the overall control of the grid. These developments along with the end-user desire to minimize...
This paper presents an numerical approach that considers into account the electrical behavior of the ACSR, for determining temperature distrbution, by using the ANSYS CFX over the cross sections of the aluminium conductor steel reinforced. Using this model verified by the experimental results later, we determine the temperature in individual layers, and the radial temperature difference of ACSR 240/30mm...
This paper investigates the effects of solar radiation intensity on the carrying capacity of transmission line conductors with different cross sections. The rated loading capacity of overhead transmission can decrease about 2% with the increase of solar radiation intensity of 100W/m2. Thus, it is inappropriate to take the solar radiation density as a constant in load current capacity calculation for...
Energy structure reforming and implementation of renewable energy generation in the regional grid usually depend up on the availability of resources, socioeconomic structure, political issues and environmental concern. In this sense a developing pacific Island country like Fiji acquires huge opportunities and potentials for implementing renewable energy. However the challenges that prevent developing...
The paper summaries the results of the Blackwall POD design studies, carried out in both the frequency and time domains. The Blackwall POD design studies show that in the small signal stability domain the performance of the new POD exceeds that of the existing POD in all cases studied. The average improvement of damping of the QNI mode across all considered cases is 18.68 %. In the large signal stability...
The reliability of electrical power network is the driving force for the development of a country Nowadays most electrical power industries and companies are working for the better satisfaction of the customers while considering the associate cost. Utility companies must have precise information concerning system performance to achieve these goals, consequently guarantee the assets maintenance. The...
Multiphase drives in electric vehicles are subject to various disturbances, both internal and external. Commonly used linear and nonlinear controllers are not always capable to successfully cope with these disturbances. The focus of this work is the improvement of speed control algorithm for a five-phase permanent magnet synchronous motor (PMSM), which is based on a sliding mode control (SMC) scheme...
Constraints to power transfer in the network may limit the load that can be supported by the transmission lines. To overcome these constraints various current uprating methods can be used. This paper discusses the developments in the use of Dynamic Line Thermal Rating (DLTR) techniques to obtain a higher rating of conductors, the general considerations for thermal uprate and High Temperature Low Sag...
With the continuous decrease in the price of photovoltaic and battery energy storage systems, upgrading a PV system with energy storage or installing a new hybrid system becomes more attractive for Australian households. This paper addresses the financial viability of BESS in the current Australian environment and whether it can provide a lower cost of energy over PV installations without BESS. Based...
The business environment of distribution networks is changing rapidly. Electricity price rises and technology advances, particularly in distributed energy resources such as solar PV and battery storage, mean that customers have new choices for their energy supply. Adoption of these new technologies, together with more efficient appliances, is leading to changing network utilisation which can contribute...
The increasing penetration of renewable power generations such as PV power plants in distribution systems is creating serious voltage quality problems such as voltage fluctuations, voltage imbalance and voltage instability. These issues can be solved by injecting reactive power to the grid. Reactive power control of transmission lines through the static synchronous compensator (STATCOM) has gained...
Increased interconnection of stochastic renewable distributed generators (DGs) with low voltage distribution networks arises challenging issues in voltage regulation, protection, stability and power quality of the system. Due to nonlinear nature of DG generations and dynamic load demands, voltage at point of common coupling (PCC) of grid-tied renewable energy system (RES) varies all the time and may...
This paper proposes a controllable resistive type fault current limiter (CR-FCL) with its modified control strategy to improve fault ride-through capability (FRT) of fixed speed wind turbine (FSWT). Investigated system includes squirrel cage induction generator, the CR-FCL, and the FSWT connected to infinite bus through double-circuit transmission line. The CR-FCL is located in beginning of the parallel...
The stringent environmental regulations and higher energy demands due to increasing population are main concerns for the energy industries. In order to comply with the environmental regulations and also to improve the energy supply of large scale photovoltaic (PV) power plants are developing rapidly as an alternative energy source to fossil fuels. Management of large scale PV power plants has become...
This paper proposes an application of the robust Padé approximation algorithm to make solutions of load flow problems reliable. Difference between the classical Padé approximation algorithm and the robust version based on the Singular Value Decomposition (SVD) is described. The robust approximation method is able to determine an optimal rational function approximation using the coefficients of a Taylor...
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