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This paper presents a mathematical analysis of a medium scale Photovoltaic (PV) power generation system connected to the distribution network and of its control system, in which the conversion stage is unique thanks to the absence of a boost chopper. Boost choppers are usually used as actuator for maximum power point tracking (MPPT). The conducted analysis leads to the conclusion that the used inverter...
This paper presents an experimental study with a hybrid microgrid system, which is proposed and implemented in the Tagajo campus of Tohoku Gakuin University, Japan. The developed microgrid consists of renewable power generations of PV and wind power generator, two types of energy storage devices of secondary battery and EDLC (Electrical Double-layer Capacitor), together with programmable DC load and...
Wind power has received much attention as the most widely used type of renewable energy because of its higher energy conversion efficiency than solar power. In addition to the large wind power turbines already in operation, small wind power turbines are also being developed to meet their increased demand in urban or rural areas. However, the efficiency of current operating small wind power turbines...
In this paper, modeling and simulation of a 500 KW prototype wind turbine that is being developed in the context of the MILRES (National Wind Energy Systems) Project in Turkey are presented. This prototype wind turbine has a nominal power of 500 KW at a nominal wind speed of around 11 m/s. Aerodynamic, mechanical, electrical and control models are built in S4WT (Samcef for Wind Turbines) environment...
One of the two hydro turbine-generator sets in small hydropower plant has become inoperable due to generator stator winding failure. Considering the age of the plant, together with generator repairs, more comprehensive plant refurbishment options have been analysed. The optimal solution is chosen, one that provides improved reliability, increased electricity production with best financial and economic...
Natural energy generators such as wind turbines and photovoltaics cause instability of the power grid due to their output fluctuations. Battery energy storage systems are being considered as a countermeasure for this issue. This paper gives an overview of battery energy storage systems used for stabilizing the output fluctuations of natural energy generators in Japan. Some verification test results...
Distribution power systems are radial in nature. Power flows in one direction from the utility to the load. Most protection, monitoring, and control devices are designed based on this unidirectional flow of power. Distributed generators (DGs) which are specifically renewable energy technologies, such as photovoltaic, wind-turbine and fuel cells are entering a stage of fast expansion. Hence, integrating...
Effect of heat pipes is described for suppressing heat leakage of the thermoelectric generator, which is used as the power source of energy harvesting. The experimental results show that the heat pipes are effective in suppressing heat leakage even if the temperature difference was small. By increasing the number of heat pipes, the output of thermoelectric generation was stable during the experiment.
In the Wind Power Market, Recentry for to improve for performance of Wind Turbine, Permanent Magnet Type Synchronous Generator is used in there, especially the fractional slot winding is extremely effective.
This paper presents a new control method for a super-turbo generating (STG) system using an accurate ship-plant system model that ascertains startup characteristics. The STG system is a waste heat recovery type of generation system that makes use of exhaust gas from the main shipboard diesel engines. With STG systems, however, control during startup is not entirely clear. Startup characteristics from...
In this study, power factor correction rectifier is proposed for wind turbines with three phase permanent magnet synchronous generators to provide maximum energy conversion efficiency. Reference values for the rectifier are controlled by a fuzzy logic based algorithm to track maximum power point of the wind turbine which varies with turbine characteristics, wind speed, temperature, etc. The proposed...
Permanent magnet synchronous generator (PMSG) is often linked to a PWM rectifier in order to provide a dc power supply. When such a system is used for variable speed applications, it is desirable to extend the operation speed range. Since the induced voltage of the PMSG increases with the speed, it is proposed in this paper to utilize flux weakening control to restrict the PMSG output voltage at high...
In this paper, application of Fuzzy-PI control for the voltage source converter based permanent magnet synchronous wind generator is proposed in order to improve Fault Ride Through (FRT) capability of wind farm including fixed speed induction generators. The membership of fuzzy logic controller is designed based on the bode diagram analysis to achieve a good stability performance of the controller...
The energy density of wave power is higher than some renewable energy sources such as wind and solar energy. However, because waves have an irregular reciprocating motion, it is difficult to convert wave power into electricity, and this has restricted the widespread use of wave power. In this paper, a new mechanism to convert wave power into electricity is proposed. It is referred to as a “direct-link”...
In this paper, we propose a thermoelectric power generation system with highly efficient ultra low input boost converter having MPPT. The proposed converter starts at input voltage of less than 0.5V and is useful for the thermoelectric power generation system. MPPT is also effective for this system and its tracking efficiency is nearly 100 %. The proposed system effectively draws the power from thermal...
In recent years, amount of renewable energy facilities using wind turbine generator and photovoltaic power system have been increased due to natural environment and resource depletion. Moreover, all electrification apartment houses or residences and electric vehicles have been increased. However, due to the fluctuating power from renewable energy sources and loads, fluctuations of grid frequency and...
The extraction of energy from ocean waves has been investigated in Europe since the 1970s. Several devices have been proposed and a few of them have been built full scale and deployed to the ocean. Actually there is not a kind of device that is accepted as the most suitable to exploit wave power.
In this paper a new controller of pitch angle control system for fixed speed wind turbines based wind farm is proposed to smooth output power for damping frequency fluctuation of power system. The control system is designed in such way for the pitch controller to operate based on wind speed and load frequency deviation information. The wind farm is connected to a multi machine power system which is...
The paper presents the results of studying the specific problems that occurred during the exploitation of two 42 MVA bulb generators. The work focuses particularly on two groups of problems which were more pronounced on only one of the two hydropower units, and these are increased vibrations of the hydropower unit and electromechanical oscillations in the stationary and transition states, which significantly...
The present paper introduces a power service discovery system. The power service discovery system realizes new power services on a smart grid. The new power services are based on the selection of generations, which enables us to provide/receive electricity under specific conditions. We describe the design and implementation of the power service discovery system. Our implementation constructs a demonstration...
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