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Masaki Imanaka,Hideki Sasamoto,Jumpei Baba,Naoto Higa,Masanori Shimabuku,Ryota Kamizato 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
In remote islands, due to expense of existing generation systems, installation of photovoltaic cells (PVs) and wind turbines has a chance of reducing generation costs. However, in island power systems, even short-term power fluctuations change the frequency of grids because of their small inertia constant. In order to compensate power fluctuations, the authors proposed the power consumption control of pumps which send water to tanks. The power control doesn’t affect water users’ convenience as long as tanks hold water. Based on experimental characteristics of a pump system, this paper shows methods to determine reference power consumption of the system with compensation for short-term PV fluctuations while satisfying water demand. One method uses a PI controller and the other method calculates reference power consumption from water flow reference. Simulations with a PV and a pump system are carried out to find optimum parameters and to compare the methods. Results show that both PI control method and water flow calculation method are useful for satisfying the water demand constraint. The water demand constraint has a little impact to suppression of the short-term power fluctuation in this condition.
Imanaka, Masaki,Onda, Yusuke,Baba, Jumpei,Yoshihara, Toru,Yokoyama, Akihiko The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.3
In this paper, the use of a seawater desalination system as a controllable load is proposed to compensate the power fluctuation of renewable energy sources and control methods are discussed. On/Off control tests were conducted with the actual desalination system without a power converter and variable pump speed tests were conducted with a experimental desalination system with a power converter. The On/Off control turned out to be not so useful for power quality enhancement. With a power converter, the power consumption of the system can be controlled with enough accuracy and response speed for the suppression of the power fluctuations caused by wind turbines and photovoltaic cells.
Imanaka, Masaki,Sasamoto, Hideki,Baba, Jumpei,Higa, Naoto,Shimabuku, Masanori,Kamizato, Ryota The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
In remote islands, due to expense of existing generation systems, installation of photovoltaic cells (PVs) and wind turbines has a chance of reducing generation costs. However, in island power systems, even short-term power fluctuations change the frequency of grids because of their small inertia constant. In order to compensate power fluctuations, the authors proposed the power consumption control of pumps which send water to tanks. The power control doesn’t affect water users’ convenience as long as tanks hold water. Based on experimental characteristics of a pump system, this paper shows methods to determine reference power consumption of the system with compensation for short-term PV fluctuations while satisfying water demand. One method uses a PI controller and the other method calculates reference power consumption from water flow reference. Simulations with a PV and a pump system are carried out to find optimum parameters and to compare the methods. Results show that both PI control method and water flow calculation method are useful for satisfying the water demand constraint. The water demand constraint has a little impact to suppression of the short-term power fluctuation in this condition.