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A systematic approach based on the graph theoretical analysis and a graph's characteristic polynomial is used to develop a model for estimating the reliability index and evaluating the availability index for a coal-fired generating power station. In this study the coal-fired generating station system is divided into six subsystems. Consideration of all the subsystems and their interrelations are rudiment...
This paper proposes a high step-up, transformerless, dc/dc converter suitable for applications where high efficiency at low power throughput is required. The proposed converter achieves high step-up dc/dc conversion through a resonant LC tank and realizes high-efficiency operation via the softswitching enabled by this resonant network. Flat efficiency is obtained via discontinuous conduction mode...
This paper presents a flow distribution control algorithm for a tandem pump and an electric motor in an electric excavator system. Efficiency is the main issue for electric excavators since the main energy comes from the battery unlike the conventional hydraulic excavators. Better efficiency and longer working hours can be achieved if the main motor operates where the integrated efficiency of the...
This paper discusses an vehicle application which uses electric double layer capacitors (EDLCs) as a power source. EDLCs are charged through a rapid charger by using wireless power transmission. In this paper, as vehicle application, the electric assisted bicycle is considered. First, the antenna for the wireless power transmission and the charger are introduced. Next, this paper compares the volume...
There are still technical issues with batteries for electric vehicles(EVs), such as less driving distance, and their short life. Then, there is an idea providing a more highly efficient and longer life energy storage system by hybridizing batteries and EDLCs (Electric Double Layer Capacitors). The purpose of choosing EDLCs is to cut the peak power of the battery. However, EDLC cannot be utilized without...
This work presents a case study of a modular photovoltaic (PV) plant where PV panel arrays are connected to the grid through cascaded single-phase current-source inverters. It is shown that, under non-uniform insolation conditions of the PV arrays, the output voltages of the cascaded inverters become unbalanced. Therefore, a dc voltage elimination control loop is proposed to balance the output voltage...
In this paper, the 12/8-pole wound field doubly salient generator (WFDSG) equipped with the full bridge rectifier (FBR) is adopted. The maximum power generated by WFDSG in FBR topology is hampered by the armature current commutation overlap under a certain speed. To improve the power density of WFDSG in FBR, FBR with serial compensation capacitors topology is proposed. The influences of the serial...
This paper proposes an on-line maximum efficiency control method for a dual-motor drive system. By using the on-line feedback signals and doing simple computations, the output torque of each motor can be determined. Then, a maximum efficiency operation of the whole system can be achieved. The efficiency of the whole system, which includes motor efficiency and inverter efficiency, is investigated....
This paper proposes a numerical algorithm for drawing distribution maps of switching power-converter characteristics on parameter spaces. The concept of the proposed algorithm is that parameters satisfying the assigned conditions are derived and followed with low computation cost. Zero-Voltage-Switching (ZVS) region, output power distribution map, and contour map of power-conversion efficiency of...
In this paper, a commonly reported single-phase four-switch AC chopper topology is compared with a six-switch topology in terms of the total harmonic distortion (THD) of the input current, power factor (PF), commutation behavior, robustness and efficiency. Working principles of both topologies are presented along with simulation results. Based on a comparison of the findings, the four-switch topology...
A combinational method for calculation of dynamic parameters of a round rotor synchronous generator in an 80 MVA, 10.5 KV power plant based on synchronous reactance calculation from phasor measurements and using rated value of control room signals is developed in this paper. The results of this analytical method, in comparison with other methods show the efficiency and accuracy of the proposed method.
A thrust allocation method with a functionality to assist power management systems by using the hull of the ship as a store of potential energy in the field of environmental forces has been recently proposed and demonstrated to work in simulation. This functionality allows the thrust allocation algorithm to decrease the power consumption in the thrusters when a sharp increase in power consumption...
In this paper, several control techniques for induction metal treating are examined to assess their performances using resonant series inverter. In fact, many types of steel are treated with heat to increase toughness and resistance to wear. Induction heating seems to be appropriate and provides several advantages in comparison with conventional techniques. In this paper, these techniques are evaluated...
This paper presents a three-phase output power control scheme of an induction heating (IH) system using an automatic variable-frequency symmetrical voltage-cancellation (AVFSVC) control technique. The power control is based on the instantaneous output power, filtered and compared with a reference value. The phase angle a is automatically varied depending on the power requirements where the low-power...
In this paper the integration between the Vehicle to Grid technology and a stationary energy storage system in a Virtual Power Plant (VPP) has been investigated. In order to evaluate the effects of such energy storage systems in an autonomous VPP, an Energy Management System (EMS), oriented to improve the local matching between electrical energy demand and production, has been proposed. To achieve...
This paper proposes the design of a novel weighted-rotor energy harvester, which oscillates due to the periodic change of the tangential component of gravity, to harvest kinetic energy from a rotating wheel. Unlike traditional energy-harvesting devices, which have a fixed natural frequency, when the speed of the car increases, the centripetal acceleration of the rotating wheel also increases the rotor's...
The integration of renewable energy systems and specifically of solar photovoltaic (PV) systems into the grid has become an important issue in the last decade because of the huge expansion of new power plants. PV systems have experienced an important evolution in the overall efficiency and in the variety of locations from low power installations (PV roof systems in domestic and residential applications)...
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