Kitakyushu Smart community Project

Development of BEMS for controlling energy throughout entire buildings


Demand Response control for all elements through to lighting and air-conditioning in addition to an electricity and heat storage system for making the most efficient use of natural energy

Release:2012/12/26Click here for news items >>
The dynamic pricing verification experiment for changing electricity rates in accordance with electrical power supply and demand being implemented for the Kitakyushu Smart Community Creation Project was started for businesses on July 23, 2012, in continuation of the experiment for households. Responding to Demand Response (DR) requests, etc. issued by the CEMS (Community Energy Management System) while controlling heat and water in addition to electricity will contribute to electricity supply and demand adjustment as a community.

Up until now, the Kitakyushu Smart Community Creation Project has aimed at converting just the [Use] of energy across to [Generate], [Store] and [Use Wisely]. The company that developed BEMS (Building Energy Management System) based on the three factors of [Generate], [Store] and [Use Wisely] is NITTETSU ELEX Co., Ltd. Yoshimisu Yamaguchi, Manager of NITTETSU ELEX Information & Communication Technology Solution Group, emphasizes the feature of the new BEMS as being, "the ability to instantly control various facilities and equipment in accordance with dynamic pricing, etc."

The main functions of the BEMS developed by NITTETSU ELEX are the prediction and planning of energy demand, the control of both electricity and heat, and the surveillance and management of all facilities and equipment based on operational data. BEMS have been installed in three buildings with differing usage scenarios; the NITTETSU ELEX Kitakyushu Business Center, the HIGASHIDA CLINIC and the NIPPON STEEL & SUMIKIN ENGINEERING Co., Ltd. dormitory. Linking these to the CEMS (Community Energy Management System), which is known as a Community "Setsuden-sho," enables the use of energy to be optimized in accordance with the different ways of usage. (Related article: Urging changes in electricity rates and participation in electricity-saving and energy-saving behavior. Link:

Handling dynamic pricing linked to CEMS

The NITTETSU ELEX Kitakyushu Business Center is the base of the company's sales and technology development activities. The objective is to install BEMS into the existing building, so only LED lighting has been new introduced as an energy-saving measure. The verification experiment is based on the themes of controlling stored electricity, managing recharging, and generating and predicting solar power, and once 50kWh (100kW) lithium-ion storage batteries, two 20kWh (40kW) virtual EV (electric vehicle) storage batteries envisioned for use with EVs, a multi-recharge and discharge electricity system equipped with functions that not only recharge EVs but also provide V2B (Vehicle to Building) usage, and a 10kW solar power electricity generating system have been installed into the existing building, BEMS will also control the lighting and air-conditioning equipment, etc. (Photo #1)

Photo #1. NITTETSU ELEX building in which BEMS optimizes and controls energy use

Photo #1. NITTETSU ELEX building in which BEMS optimizes and controls energy use
    The white container in the center is a fixed lithium-ion storage battery with an output of 50kWh (100kW).
    The green container is a lithium-ion storage battery simulating an EV (Electric Vehicle) storage battery.
     A multi-charge system capable of recharging several EVs simultaneously can be seen on the left.
    (Photograph by Kazushi Kuwata)

There are two control modes available: (1) Demand Response (DR), and (2) Energy-saving. The DR mode responds to the dynamic pricing information transmitted from the CEMS to discharge electricity from the storage batteries and switch off the lights and air-conditioning when prices are high and recharge the storage batteries when prices are low. In addition to performing control based on the seasonal and time-adjusted rates (basic prices) received the previous day and the revised rates (real-time prices) received at 6 o'clock that morning, the system also responds in accordance with the CPP (Critical Peak Prices) rates enacted two hours previously.

For example, The dynamic pricing implemented on August 20, 2012, succeeded in shifting peak-hour demand by 130kW, involving 90kW from controlling the air-conditioning in alignment with rate fluctuations, 10kW from controlling the lighting, and an additional 30kW from controlling the recharging and discharging of storage batteries. (Fig.1)

Fig. 1 Predictions and results for power demand on August 20, 2012

Fig. 1 Predictions and results for power demand on August 20, 2012
    Power demand is lowered when the electricity rates submitted by CEMS (white = basic, green = real-time)
    are high and raised when they are low. The transition of the actual results (yellow bar graph) is practically the
    same as the original plan. (Source: NITTETSU ELEX)

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