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In recent years, the distributed generators have come into wide use in the small-scaled power grid, for example in the semiconductor manufacturing factory. And the customers of the generators request the machine to continue operating, during and after the instantaneous voltage sag. This paper introduces the DVR effect, operating with the distributed generators in voltage sag of the power line. The...
This paper proposes an AC/DC power supply system with DGs using the parallel processing method. The purpose of this system is to supply the power without connecting to the utility gird. The DGs consist of photovoltaic (PV), -and wind generators (WG), and the main energy source of this system is the DGs and the UPS battery. When the system does not get enough energy from the DGs, and the power supply...
This paper proposes a new AC/DC power supply system with DGs using the parallel processing method. The purpose of this system is to supply the power without connecting to the utility gird. The DGs consist of photovoltaic (PV) and wind generators (WG), and the main energy source of this system is the DGs and the UPS battery. When the system does not get enough energy from the DGs, and the power supply...
We have developed an uninterruptible power supply system (UPS) with distributed generators (DGs) and started field testing with to reduce environmental effects and increase local energy production for local consumption. The purpose of this system is to supply the power without connecting to the utility gird. The DGs consist of photovoltaic (PV) -and wind generators (WG), and the main energy source...
This paper describes a method to enhance the load frequency control in a power system with distributed generations (DG). In this paper, a power storage system is used with photovoltaic generation and wind power generation. The microgrid system at Aichi Institute of Technology in Japan is used as a simulation model. For each simulation, which was carried out by using a power transmission simulator,...
This paper describes the flywheel storage system uses for the smoothing of power variation of photovoltaic generation. Since it is dependent taking the power generation energy as energy of the sun, the power variation of photovoltaic generation is very big. Therefore, frequency variation and voltage variation, when the photovoltaic generation linked the power system. And, there is a problem of the...
In the real world, the AC load is more common than the DC load, so many PV power systems have an inverter. Although has various structure type inverters, but Speaking of the simulation research, single-phase inverters in all structures are the same. The stand-alone inverter model has established in this paper, the open-loop and close-loop simulation results are shown. The simulation results indicate...
We report on the development of an uninterruptible power supply system with distributed generators (DGs), which balance load demand and output of DGs, and also provides a high quality power supply. We studied the architecture of the system, and built a demonstration system. This system includes a 50-kW bi-directional converter, a 10-kW photovoltaic (PV) panel, PV converter, and VRLA batteries. We...
Fuel cell (FC) systems have been showing up as a promising alternative due their high efficiency, low aggression to the environment, excellent dynamic response, and superior reliability and durability. This paper introduces the electrochemical model of FC and establishes the Simulink model based on it. The results of the model are used to predict the output voltage, efficiency, and power of FC as...
This paper describes a method to enhance the load frequency control in a power system with distributed generations (DG). In this paper, a power storage system is used with solar photovoltaic generations and wind power generations. The microgrid system at Aichi Institute Technology in Japan is used as a simulation model. For each simulation, which was carried out by using a power transmission simulator,...
This paper proposes the pole change generator for micro windmill with maximum power point tracking (MPPT) system. First, to show the effect of the pole change generator, the generator and the pole changing controller are made. Then, the pole change generator can make the values of best load by converting the pole number. Next, the input variable and the control method are examined for the improvement...
This paper describes a method to improve the power quality of a distributed generation (DG) power system. The proposed method uses a power storage system with DG. Here, DG is assumed the renewable energy systems such as photovoltaic generation (PV), wind power generation (WG) and fuel cells (FC), etc. The effect to use the storage battery is shown by the following two experiments. One case is the...
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