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Each year, the highest costs in Telecom network shelters and cabinets are not related to personnel or construction, but to energy consumption. The highest proportion of energy costs derive from the energy consumption of electronics cooling units, which run around the clock to ensure well-balanced running temperatures for the enclosed electronic equipment. Technologies designed to reduce energy emissions...
The facility cost of the storage systems are a critical issue in the construction of micro grid, which is the core of the renewable energy. We propose the direct current mutual power interchange system as a way to reduce the storage battery capacity. This paper reports the outline of the proposed system and the verified result on the effect caused by electricity interchange upon the reduction of battery...
DC 380 V power supply has begun to be used for data centers to save energy and supply high quality power. This paper describes dc capacitor voltage regulation of ac-dc converter using Modular Multilevel Cascade Converters based on Single-Star Bridge-Cells (MMCC-SSBC) without line frequency transformer. The proposed voltage regulation method compares each dc capacitor voltage with the reference value...
Simulations of annual reduction in power consumption based on tests of the energy-saving effect of introducing the air-side economizer (direct outside air cooling) to data centers in Japan are reported. Effects of environmental factors on energy saving are compared for air-side economizer and conventional systems that use air conditioners for cooling. When the air-side economizer is used, weather...
This paper presents an Energy Optimization Model (EOM) for Mobile Service Providers (MSP) that enables the optimization of power efficiency and the integration of optimum renewable and clean energy sources into the mobile network. The model approach drives both Operational Expenditure (OPEX) and Capital Expenditure (CAPEX) reduction via re-engineering power provisioning and site solutions. The features...
Reducing the power consumed by base stations is an urgent requirement. Our research shows that it is possible to reduce electricity consumption, especially peak loads, by predicting the power demands of base stations. This approach is implemented in the Green Power Controller, a technique developed for the Green Base Station which is the power system of base stations used for disaster relief and reducing...
At the present time, the concept of coordination of photovoltaic generation systems with existing power systems has become the focus of increasing attention. Taking coordination between photovoltaic generation systems and power storage equipment as its theme, this paper elucidates the outlook for control conditions and the recovery of costs with the focus on economic performance and also reports on...
We present an integrated approach for allowing a commercial building to reduce the peak demand of electrical power by air conditioning control, while maintaining comfort. The proposed method controls simultaneously, the power demand and room temperature change in the building. Power demand forecast is used to forecast the time of peak demand for the building. Heat capacity modeling is used to estimate...
In this paper, we propose a new power peak shifting system that uses demand forecasting. The study is based on the assumption that a dynamic pricing system has been introduced to an office equipped with a data center. In addition, we report on the results of simulations that show our proposed peak shifting scheme improves system utility and strength through increased economic efficiency, even when...
A new power supply topology is proposed for using various types of power supply systems together in data centers and telecom buildings. In this topology, the power supply chain from the building power receiving point to the IC chips in the ICT equipment is organized into blocks to simplify the number of DC bus conversion steps. Two types of voltage for the DC bus are proposed; 380 V and 48 V. This...
Energy consumption in Japan has been increasing year by year. In particular, energy consumption of the civilian sector and the transportation sector have doubled since the first oil crisis. Recently, energy saving activities, such as the power peak-cut or power peak-shift for the purpose of reducing electricity bills, is carried out. On the other hand, in the demand side of electric power, research...
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