Compensation for Photovoltaic Generation Fluctuation by Use of Pump System with Consideration for Water Demand

  • Imanaka, Masaki ;
  • Sasamoto, Hideki ;
  • Baba, Jumpei ;
  • Higa, Naoto ;
  • Shimabuku, Masanori ;
  • Kamizato, Ryota
  • Received : 2014.11.04
  • Accepted : 2014.12.29
  • Published : 2015.05.01


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.


Solar powered pumping;Island power system;Demand response;Controllable load


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