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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...
The authors proposed a novel segment type reluctance generator (RG) and presented the experimental performance. It had similar induced voltage to the usual three phase synchronous generator, but the efficiency was low. This paper presents a novel segment type switched reluctance generator (SRG) to improve the efficiency and describes its FEM analysis for wind power generation. The performance is compared...
This paper analyzes the mitigation of the unintended fluctuation of wind power generation output with BESSs (Battery Energy Storage System) in the isolated power system in Jeju island. Wind farms are modeled for the simulation that indicates the virtual system in 2014. In the simulation, BESSs are installed in each wind farm to smooth the fluctuation of wind farm output for stabilizing the grid frequency...
This paper proposes a novel method of suppressing inrush currents of squirrel-cage induction machines using matrix converters in wind power generation systems. In the proposed method, the output side of the matrix converter behaves as a resistor for the source current and the input side of the matrix converter compensates reactive power of the squirrel-cage induction machine. Digital computer simulation...
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...
In recent years, energy consumption has been increasing rapidly due to the increased use of Information and Communication Technology (ICT) systems. As one solution to this issue, 380 V dc power distribution systems have been attracting attention as high-efficiency and high-reliability power systems that can be used in telecommunications buildings and data centers. Against this background, we have...
In order to solve problems of global warming and depletion of energy resources, renewable energy systems such as wind generation is getting attention. However, wind power fluctuates due to variation of wind speed, and it is difficult to wind power forecast perfectly. Therefore, wind power developers should follow the strict condition for output power smoothing when wind turbine generators (WTG) are...
Large wind energy power plants are widely commercialized and integrated in existing electric power grids. The randomness of wind speed over a short period can greatly affect short term generation scheduling. This paper addresses this problem through an optimized day ahead short-term generation scheduling of both thermal and hydrothermal energy systems at different power penetration levels. There are...
The connection of wind farms to the electrical power system has increased very fast in the last years requiring the ability of the wind turbines to assist network during voltage sags. Most of the modern wind turbines are based on doubly fed induction generator with a back-to-back power converter connecting the rotor windings to the grid. One limitation of doubly fed induction generator is the operation...
This paper proposes the speed sensorless fuzzy MPPT control of grid-connected PMSG for wind power generation. The proposed fuzzy MPPT control is simple since it does not need any knowledge of wind turbine characteristics and speed sensor. Based on small wind power generation, the boost chopper is used to implement the proposed fuzzy MPPT control. There is a specific value of duty cycle which yields...
Photovoltaic (PV) systems are rapidly gaining acceptance as some of the best alternative energy sources. In installation area of large PV/battery system, it requires appropriate operation for example of a method considering power output fluctuation and insolation forecasts errors. In addition, it is better to minimize the size of battery and its capital cost. This paper proposes an optimization approach...
Wind power forecasting has recently become important to fulfill the increasing demand on energy usage. Two main approaches are applied to the wind power forecasting which can vary from 6 hours to 48 hours. One way is to model the atmosphere dynamically and the other method is to analyze wind speed and direction statistically. Although dynamical models forecast better than statistical models, since...
Hydrogen production using wind power generation system is very effective for solving the energy supply problem in the future. Many strategies have been proposed for the operation of a grid-connected wind farm. But operation method of stand-alone wind farm has not been studied sufficiently so far. There are many places with good wind condition but without connectable grid, where stand-alone wind farm...
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