- Using HEMS to Achieve Optimal Energy Management in Detached Houses and Housing Complexes
The Yokohama Smart City Project (YSCP) consists of a number of projects that have begun to produce results. One project is conducting a demonstration of demand response (DR) in the largest such demonstration in Japan, covering 3500 households. Another uses a home energy management system (HEMS) to promote efficient energy use and conservation in the household sector. Yet another project is using home-to-home energy wheeling.
- Optimal Control of EV and Charging Station Storage Batteries by Linking with CEMS
As part of the Yokohama Smart City Project (YSCP), a V2H (vehicle to home) system was developed such that storage batteries in electric vehicles (EV) were charged with electric power from home photovoltaic (PV) power generation systems and conversely the storage batteries supplied electric power to homes. A charging station energy management system (EMS) was developed that used PV power generation and storage batteries supporting demand response (DR) linked to a community energy management system (CEMS). Using this, EV sharing was demonstrated. The project sought to develop a combined energy storage / charging system for EVs by combining multiple quick chargers with high-capacity storage batteries. The Storage Battery SCADA system was also developed. This system sees the multiple storage batteries as one virtual battery containing them all. Among other things, DR was demonstrated that eliminated the need for power usage limitations.
- Peak Demand Reduction Adequate in Smart BEMS Verification; Now Companies will push toward Commercialization
The Yokohama Smart City Project (YSCP) aims to make Yokohama into a smart city that already has infrastructure in place. Projects related to energy management in large buildings have all obtained adequate results, and commercialization is said to now be within sight. The following is an overview of the results obtained in different projects and their future direction.
|Name of city||City of Yokohama|
|Area||435.17km2 (as of August 2012)|
|Population||3,703,258 (as of January 2014)|
|Locations for the operational experiments||City of Yokohama as a whole, with a focus on three districts: The Minatomirai 21 district, the Kohoku New Town district, and the Yokohama Green Valley district|
|Area covered by the operational experiments||435.17km2(as of August 2012)|
|Number of households involved in the operational experiments||4,000 houses and apartments for social verifications and technology verifications|
|Number of workplaces involved in the operational experiments||4 office buildings, 3 commercial buildings, 4 apartments, 1 large-scale factory|
|Number of EV/PHV involved in the operational experiments||25 EV for demand response (DR) verifications (including 6 EV for charging/discharging; 2 charging stations with PV/storage batteries)|
|Target for introduction of photovoltaic generation, etc.||Photovoltaic (PV) generation: 27MW; HEMS: 4,000 households; EV: 2,000 vehicles|
About the city
With a population of 3.7 million, Yokohama is a large city even by world standards. Commercial buildings are clustered around the Yokohama Station area and factories concentrate around the bay, while residential areas are situated inland. The diverse topographical areas of the city include the commercial district centering on Minatomirai, with its numerous high-rise buildings on the site of a redeveloped bay area that used to be a shipyard; the large-scale "new town" area, developed between the 1970s and the 1990s and covering about 2,500 ha; and the bay around which large-scale apartment and industrial complexes are concentrated.
Overview of the project
The Yokohama Smart City Project (YSCP) is an effort to develop a model for smart cities by means of cooperation between citizens, private companies, and the municipality, and to export the successful model to Japan and the rest of the world. Large-scale operational experiments are being held with Yokohama, a large, advanced city with a diverse topographical range of districts, as the stage. The hierarchical bundling of energy management systems (EMS) enables energy management at the level of individual EMS and demand-side management at the level of the overall system.
Each of the EMS considers its respective environment in managing energy and making energy use visible. There are a number of different types of EMS: HEMS for houses, HEMS for residential complexes, HEMS for apartments, integrated BEMS, and FEMS, which optimally control factory operation. Integrated BEMS offer group management of BEMS for office buildings and commercial facilities. In addition to these, the CEMS brings together elements including the electric vehicles (EV) for charging and discharging verifications, charging stations, and the SCADA storage batteries that contribute to system stabilization, which will form the nucleus of next-generation transport systems, and offer optimal management of energy at the level of the community as a whole.
By means of optimal linking of the EMS, centering on the CEMS, we are creating infrastructure that will facilitate the large-scale introduction of renewable energies, for example by offsetting the instability of weather-sensitive photovoltaic (PV) generation. At the same time, we are conducting large-scale verifications of demand response (DR). In addition to curbing power demand by providing consumers with incentives to limit their electricity use, thus contributing to the reduction of CO2 at a lower social cost, we are realizing overall optimal energy management while testing DR to make it possible to absorb the surplus power that will be generated by the large-scale introduction of PV generation.
Our aim is to transform a city already provided with social infrastructure into a low-carbon city while maintaining the comfort of its residents. In order to do so, we will introduce a CEMS and develop and operate energy management systems optimized for this specific region. Together with these efforts, we will use PV generation and other forms of renewable energy, and work to change the way that citizens relate to energy. Specifically, we will introduce HEMS for homes, BEMS for offices and commercial buildings, FEMS for factories, and EV and charging stations for the transport sector, and we will curb peak energy demand and conserve energy through their mutual linkage.
Themes of operational experiments
PV generation, storage batteries, CEMS, HEMS, BEMS, FEMS, EV, charging infrastructure, SCADA storage batteries