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We present the optimal design of energy supply system of a urban microgrid by using a Mixed Integer Non Linear Programming model. We have conducted a feasibility study of energy supply system using waste steam from incinerator plants via a steam distribution network in the urban redevelopment project area in Tokyo as a case study. We compared the optimal configuration of both of a district heat and...
We are trying to develop an easy autonomous map making method for indoor mobile robots, using the property of the usual buildings, which we can assume that the major walls are arranged parallel or perpendicular. Based on these properties, the robot can find its own direction easily, with its surroundings range data, so that the accumulated error in the calculated direction can be avoided. In this...
This paper discusses investment strategies in a microgrid system consisting of cogeneration system and renewable power generation under uncertainty in the natural gas price. Although incentives for introducing distributed energy system increase these days, volatile natural gas prices make its investment in gas fuel distributed generation systems risky. Therefore, it is important to evaluate the risk...
This paper analyzes energy saving effects of a combined heat and power (CHP)-based microgrid by an optimal sizing of energy supply system and optimal planning method. We also present economic feasibility and potential amount of reserve provision by microgrids.
Previous studies pointed out that the participation of microgrids in the frequency control enables us to reduce the frequency fluctuation of the power system. This feature of microgrids can help penetration of renewable energy resources without extensive investment in utility grids and to reduce the capacity of thermal power plants for load frequency control (LFC) of the power systems. On the other...
This paper discusses possible integration of demand side resources in electricity markets as a demand response program. To explore the technical feasibility of demand response (DR) programs and technologies, we performed a preliminary analysis of load impact by a couple of demand responsive technologies in air-conditioning, lighting and computing appliances for commercial building sector in the Tokyo...
The economic evaluation of the microgrids is still challenging. This paper presents a methodology to design the number and capacity for each piece of equipment (e.g. gas engines, batteries, thermal storage tanks) in a microgrid with combined heat and power (CHP) system. In the methodology, annual cost is minimized by considering the partial load efficiency of a gas engine and its scale economy, and...
A cooperative control system for gas engine generators and a lead-acid battery in a microgrid was developed. The control system enables a microgrid system to balance the electric power demand and supply and to simultaneously control the state of charge (SOC) of the battery. To evaluate this control system, we simulated its performance in balancing the control of an experimental microgrid facility...
A methodology was developed to design the number and capacity for each piece of equipment (e.g. gas engines, batteries, thermal storage tanks) in a microgrid with combined heat and power(CHP) system. In the methodology, annual cost is minimized by considering the partial load efficiency of a gas engine and its scale economy, and the optimal number and capacity of each piece of equipment and the annual...
The Japanese government has set targets for increasing the contribution from renewable energy sources, such as wind power and photovoltaic (PV) generation. To increase renewable energy near the demand side, a microgrid that utilizes controllable prime movers such as gas engines to compensate fluctuating demand and output of renewable energy is proposed here. However, because such systems include high-capacity...
The Japanese government has set targets for increasing the contribution from renewable energy sources, such as wind power and photovoltaic (PV) generation. The fluctuating power of renewable energy sources, however, might degrade power quality such as voltage and frequency. To increase renewable energy near the demand side, a microgrid that utilizes controllable prime movers such as gas engines to...
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