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From depletion of energy resources and consideration to natural environment, introduction of renewable energy facilities has been increasing annually. Moreover, introduction of photovoltaics has increased on the demand side. However, due to the fluctuating power from renewable energy sources, frequency and voltage fluctuations of power systems become problematic. At the same time, there has been a...
As wind turbines continue to grow in size and flexibility and are deployed in more hostile environments, the need to develop advanced control schemes will be elemental to deliver the lowest possible energy costs. This paper explores controller design based on modeling the wind speed as a stochastic process, and the wind generating system (WGS) as a multi-mass system with a soft shaft linking the turbine...
From depletion of energy resources and consideration to natural environment, dispersed power system such as wind power generators are introduced. Moreover, all electrification in houses or residences and electric vehicles are increased in recent years. Again, introduction of photovoltaics has increased in demand side. However, due to the fluctuating power from renewable energy sources and loads, frequency...
Stand alone ac power supply system like that is designed for isolated islands is subjected to large frequency and voltage fluctuations caused by power deviation of wind turbine generator and load demand. An autonomous decentralized frequency control system of parallel operated decentralized generators based on droop characteristic is presented in this paper. The conventional droop control methods...
The output power fluctuation of renewable energy power plants such as wind turbine generator and photovoltaic system result in frequency deviation and terminal voltage fluctuation. Furthermore, these power fluctuations also affect the turbine shafting of diesel generator and gas-turbine generators which are the main power generation systems in isolated islands. This paper presents a control strategy...
The output power fluctuation of renewable energy power plants such as wind turbine generator and photovoltaic system result in frequency deviation and terminal voltage fluctuation. Furthermore, these power fluctuations also affect the turbine shafting of diesel generator and gas-turbine generators which are the main power generation systems in isolated islands. This paper presents a control strategy...
The output power fluctuation of renewable energy power plants such as wind turbine generator and photovoltaic system result in frequency deviation and terminal voltage fluctuation. Furthermore, these power fluctuations also affect the turbine shafting of diesel generator and gas-turbine generators which are the main power generation systems in isolated islands. This paper presents a control strategy...
The Cu substrates have the advantages of no ferromagnetic contribution to hysteretic AC losses, and low cost compared to Ni substrates. We investigated the Jc-B properties of YBCO films deposited on the cube-textured Cu tapes with intervening buffer layers. A protective Ni overlayer was added on top of the cube-textured Cu tape by electroplating to reduce the oxidation rate of the Cu substrate. The...
Currently, there are several published reports on wind power detailing various researches based on such subjects as pitch angle control, variable speed wind turbines, energy storage systems, and so on. These reports propose output power leveling to reduce the adverse effects of power system frequency deviation. In this context, it is desirable to decrease frequency deviations of power systems by output...
Many isolated small power systems are powered by diesel generators, which results in greater operating costs than interconnected large grids. It is therefore desirable to integrate renewable energy sources such as wind power into these small grids. However, due to the fluctuating power generation from renewable energy sources, frequency deviations of power systems become problematic. Distributed intelligent...
Wind energy is a significant and powerful natural resource that is safe, clean, and abundant. However, wind energy has a drawback of having only 1/800 density as compared to that of water energy, and it is not constant and wind turbine output is proportional to the cube of wind speed, which causes the generated power of wind turbine generator (WTG) to fluctuate. In this paper, a technique is proposed...
This paper presents an output power control methodology for wind turbine generator which can decrease frequency deviation of power system using load power estimation. Load power is estimated by a disturbance observer, then output power command for wind turbine generator is determined according to estimated load power. Additionally, the wind turbine generator can also be controlled well during wind...
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