The utilization of renewable energy and solar energy in specific is rapidly increasing in Japan. This research, it is proposes a method to find the most efficient angle and direction for the solar radiation when the solar power is introduced by using Geographic Information System (GIS) in Kitakyushu city, Fukuoka Prefecture as an example. The results revealed that the south facing angle of 25 degrees is the most efficient angle on the solar power for Kitakyushu city, Fukuoka Prefecture, Japan. The results are promising and required for the best utilization of solar energy in Japan. The method is applicable anywhere in the world with the availability of GIS data access.

Multi-deployment of dispersed power sources became an important need with the rapid increase of the Distributed generation (DG) technology and smart grid applications. This paper proposes a computational tool to assess the optimal DG size and deployment for more than one unit, taking the minimum losses and voltage profile as objective functions. A technique called radial basis function (RBF) neural network has been utilized for such target. The method is only depending on the training process; so it is simple in terms of algorithm and structure and it has fast computational speed and high accuracy; therefore it is flexible and reliable to be tested in different target scenarios. The proposed method is designed to find the best solution of multi-DG sizing and deployment in 33-bus IEEE distribution system and create the suitable topology of the system in the presence of DG. Some important results for DG deployment and discussion are involved to show the effectiveness of our proposed method.

This research proposes a residential Photovoltaic-Power Conditioning Subsystem (PV-PCS) in a functional and stable power supply system with battery storage (Electric Vehicle [EV] storage etc.) to reduce PV output fluctuation. In PV power generation, PV power fluctuations caused by weather changes make it difficult to obtain stable power output. Further, it can then be expected that this adversely affects the power system. In this paper, functional power supply system model is constructed with power fluctuation suppression control system using bidirectional DC/DC converter and existing residential PCS and EV battery storage. Furthermore, simulation results of the electric battery power suppression element of the PV power fluctuation are also shown by using Simple Moving Average (SMA) control method to suppress PV power fluctuation. PV power suppression system using existing residential PCS has an advantage that can not only suppress the energy change during normal operation but can also construct the isolated power supply in an emergency case of power supply loss. In this emergency case, EV battery storage control provides the power to critical loads during utility outage. This feature is not available without storage. Also, effectiveness of PV-PCS interconnection stable power supply system with existing residential PCS in Japan was proposed. Moreover, a basic research of solar power generation amount of solar radiation estimation and the resulting simulation on information acquisition method of solar energy capacity using Geographic Information System (GIS) are presented.

This research aims to propose a power supply system in which conventional photovoltaic (PV) system attains advanced functions. First, each household can use the power independently from the power system and load in the power system is reduced in the event of power shortage. Second, stable power is obtained from PV in which the output fluctuates due to the change in the amount of solar radiation. Third, PV output suppression is avoided when voltage of the distribution line is increased by the reverse power flow. Fourth, stable power is supplied to each household and refuge in the event of disaster. To achieve these, grid-connected and self-sustaining power supply system is developed by connecting a DC/DC converter between electric vehicle (EV) battery and conventional power conditioning subsystem (PCS) of PV system. In this paper, the power supply system model is presented. Also, the bidirectional DC/DC converter circuit is described in consideration of PV system installed in Kyushu Institute of Technology and of major EV in Japan. Finally, the hardware configuration of the proposed system is shown. It is considered that the effectiveness can be evaluated by constructing the proposed system.