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We developed and field-tested an electric vehicle quick charger (EVQC) with storage battery to suppress the lengthening of charging time while preventing a rise in a building's peak power usage caused by EV charging. This EVQC features a demand control technique that determines the amount of power to be used by the charger according to the amount of power used by the building. In addition, charging...
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...
The amount of energy consumed by data centers and telecom buildings is increasing annually due to the buildup and high-density arrangement of ICT equipment, which is needed to handle the rapid rise in traffic brought on by the spread of smartphones and advances in the Internet usage environment. At the same time, services that use ICT equipment are expected to provide high levels of reliability and...
The present study discuss about restructuring in lighting systems in order to improve load leveling. The aim of this paper is to perform an economic assessment of utilizing DC lighting instead of AC lighting in presence of photovoltaic energy systems. For each scenario, the amount of luminous flux (lm) provided by the lighting fixtures is constant based on requirements for office spaces. The current...
With the technology roadmap of LED moving towards high efficacy low power LEDs, the current AC distribution system suffers from system inefficiency. An energy efficient ELVDC power distribution for LED lighting system is proposed. The different design considerations affecting the inherent higher voltage drop at ELVDC level are discussed in this paper. Simulations are presented in the context of a...
The European Commission is supporting many projects in the field of energy saving, with the aim to improve user behavior and to help Europe to meet emission targets. In October 2012, the European Union adopted the Energy Efficiency Directive with the aim to reduce the primary energy consumption by 20% by 2020. One key point in the reduction of energy consumption energy is the awareness of final users...
In recent years a growing attention is being paid towards energy efficiency in civil and industrial applications. In order to achieve better efficiency and enhance the energy management strategies, better knowledge is needed on the characterization of energy consumers. Categorization of electrical consumers through clustering procedures has been widely addressed in the literature. However, the categorization...
By constructing a small-scale microgrid, we have examined a control and operation method for the efficient use of distributed power generation. Thus far, the high-efficiency operation of distributed power introduced into grid has not been achieved. In this study, a method that operates a microgrid by predicting the PV output and electric power demand is proposed. Then, the effectiveness of this method...
With the recent focus on DC power distribution in the built environment due to ease of integration of DC energy sources such as solar photovoltaic and battery energy storage, the Extra Low Voltage DC (ELVDC) power distribution system suitable for high rise building with direct integrated DC energy sources and LED lighting loads is discussed in this paper. Design considerations and system level modeling...
Typical low cost light sensors used in modern day buildings have an error of up to 40%. To achieve intelligent lighting control for intelligent energy management, illuminance sensor nodes need to have less than 5% error. In order to realize such sensors, high accuracy illuminance sensors of error less than 3 % are proposed to be integrated with high resolution Analog to Digital Converters (ADC). Subsequently,...
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...
Interest and adoption of 400V DC power has been growing over the past decade. After many years of studies and trials, commercial implementation of 400V DC power in production telecommunications and data center sites is becoming a reality. This adoption is driven by multiple motivators, depending on the site-specific application and layout. This paper will present case studies of the implementation...
Grid connected hybrid hydrogen systems consisting of an electrolyzer, a fuel cell and a battery may become major parts of local energy systems in future. System setup is quite challenging due to different electric constraints and the need for a gas management system. This paper presents planning for a technical setup using a DC micro grid and a hydrogen pressure tank and the development of a new control...
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