德赢ac米兰vwin, New Energy and Global Warming Countermeasures Department, Environment and Agriculture Bureau, Kanagawa Prefecture
- Developing the industry's first system to enable electricity discharge from EVs connected to 德赢ac米兰vwin -

Background

The Great East Japan Earthquake led to electricity shortages, and this has increased attention given to the topic of controlling peak power. Approaches to controlling peak power include peak cutting (controlling electricity consumption during peak hours) and 德赢ac米兰vwin (using storage batteries, etc. to store nighttime power and discharge it during peak hours). Peak cutting can be further divided into demand control (controlling the amount of users' electricity consumption) and the use of photovoltaic-like power generators to control apparent electricity consumption.

德赢ac米兰vwin is increasingly gaining attention because of its lesser effects on the electricity grid and in consideration of the need to avoid inconvenience for consumers. Conventionally, 德赢ac米兰vwin has not effectively taken hold due to the costs of storage batteries and other necessary items. Boosted by subsidies from the national and local governments as well as low pricing of storage batteries, 德赢ac米兰vwin is gradually penetrating the market.

Product (system) description

The 德赢ac米兰vwin aims to conform to the trend toward controlling peak electricity demand in the summer, and to reduce electricity rates (rates for 160 kW are cut by 15%) by reducing contract demand and by using less expensive nighttime power.

Figure 1 illustrates the 德赢ac米兰vwin. This consists of a power conditioning system (PCS)^{(note 1)}, lithium (Li) 德赢ac米兰vwin, EV-PCS^{(note 2)}, a visualization system (德赢ac米兰vwin is monitored and the amount of electricity is visually shown to calculate and display cost) and an energy management system (EMS)^{(note 3)}.

Conventionally, electric discharge from using an electric vehicle as a storage battery has involved separation from the grid (commercial AC line). The 德赢ac米兰vwin is characterized by electrical discharge without disconnection from the grid. Moreover, it controls multiple storage batteries. This is the industry's first verification test for the 德赢ac米兰vwin.

We have developed the communication protocol for controlling the overall design of the system and multiple PCS's, the visualization software with viewable information about 德赢ac米兰vwin and the amount of discharge, and the EMS software which facilitates the discharge from multiple PCS's in accordance with the amount of electricity consumed.

A larger version of this product can also be proposed. The 德赢ac米兰vwin project expects sales of 300 million yen in fiscal 2013.

Figure 1: 德赢ac米兰vwin configuration

Product (system) features

• 德赢ac米兰vwin: 10 kW (integrated with Li storage battery)
• Li 德赢ac米兰vwin capacity: 12.5 kWh
• EV-德赢ac米兰vwin: 10 kW (limited to 6 kW LEAF output)
• Visualization system: Monitors the volume of electricity consumed on the commercial line, volume of photovoltaic (PV) power generation, and volume of 德赢ac米兰vwin discharge, and visually displays these data.
• EMS: PCS and EV-PCS are controlled to prevent 德赢ac米兰vwin from exceeding a certain level.
• After the experiment, the 德赢ac米兰vwin will remain and be exhibited at the Industrial Technology Center (Ebina) for demonstrations for small- and medium-sized companies.

Glossary

(note 1)PCS: power conditioning system. 德赢ac米兰vwin a device for converting DC to AC, or vice versa. It facilitates connection of DC and commercial AC that are input and output via photovoltaics (PV) and storage batteries.德赢ac米兰vwin

(note 2)EV-PCS: This type of PCS charges and discharges an electric vehicle德赢ac米兰vwin

(note 3)EMS: energy management system. This controls multiple storage batteries and facilitates 德赢ac米兰vwin to prevent peak power from exceeding a certain value.德赢ac米兰vwin