- Japan's Largest Ever DR Verification Experiment Supported by CEMS Achieves a Maximum Peak Demand Reduction Rate of 15.2%
The Yokohama Smart City Project (YSCP) continues to implement verification experiments into Demand Response (hereinafter known as DR) targeting commercial facilities, factories, housing complexes and detached residential houses. The element that plays a central role as a control tower for this is the CEMS (Community Energy Management System). It controls electricity consumption through the provision of an electricity rate menu designed to encourage consumers to save electricity, and incentives. The YSCP implemented Japan's largest ever DR verification experiment targeting 1,900 households in fiscal 2013. It also enhanced DR operating accuracy so that it can draw closer to peak demand reductions and other planned target values.
- The Self-Production/Self-Consumption of Electricity Targeted Through Links Between Solar Power Systems and Storage Batteries
The Yokohama Smart City Project (YSCP) is pouring much effort into home energy management in such areas as implementing the nation's largest verification experiments into Demand Response (DR) in the private residence category targeting the 1,900 households that installed HEMS (Home Energy Management Systems) in the summer of 2013, etc. Even larger verification experiments aimed at the households with HEMS installed, which has since been increased to 4,000, are planned for fiscal 2014. Panasonic is one of the companies that supply the YSCP with HEMS, and it has also adopted its own verification experiments. These involve "Generate and Store" energy management for households incorporating solar power systems and storage batteries.
- Controlling EV Recharging/Discharging and Quick Chargers through Links with CEMS
The Yokohama Smart City Project (YSCP) is moving ahead with a wide range of verification experiments into EMS (Energy Management Systems) in anticipation of the wide-spread distribution of EVs (Electric Vehicles). Nissan Motor Co., Ltd. is involved in a V2H (Vehicle-to-Home) system in which electrical power is supplied to residential homes with the use of storage batteries mounted in EVs; JX Nippon Oil & Energy Corporation and Nippon Electric Company (NEC) is involved in an EV recharging system combining multiple quick chargers and large-capacity batteries; and Hitachi Ltd. is involved in improving the efficiency of recharging EVs used for car-sharing purposes.
|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