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Poly(trimethylene terephthalate) (PTT) is a material that has intermediate properties between poly(ethylene terephthalate) (PET) and nylon, and produced by polymerizing bio‐based 1,3‐propanediol and terephthalic acid. In this study, the possibility of replacing existing biaxially oriented PET (OPET) and nylon 6 (ONylon) film with biaxially oriented PTT (OPTT) film is investigated to develop a more...
The energy consumption in residential section accounts for over 30% of the world and cost-effective indoor energy management is important. Visible light communication based on variable pulse position modulation (VPPM) is a scheme for efficient and convenient indoor energy management. This paper proposes methods for detecting dimmable packet. First, we describe a method based on correlation bank expanding...
This paper proposes energy management in smart home with solar renewable energy using smart plug and inverter. Through the smart plug, information on all loads in the home is monitored and collected to an energy management center. Load profiles are managed, and the loads are classified dynamically based on the profiles in the center. When a power failure occurs, the multimode solar inverter supplies...
Distributed Energy Resource (DER) is a small-scale power generator which can be distributed in near power consumption areas. A high ratio of DERs increases management complexity and also decreases supply stability of electric power. However, if DERs are suitably used, they can improve reliability shown in conventional electric power generation. Moreover, they can also eliminate the size and number...
As the introduction of distributed energy resources into power system is increasing and the service applications for them become more diverse, the scalability of the communication networks for monitoring and control becomes important. That is, a communication method considering loosely coupled and many-to-many relationships between distributed energy resources and their applications needs to be applied...
In general, Open Application Programming Interfaces (APIs) provide advantage that general Web programmer who doesn't have expertise on a specific domain can develop and maintain domain specific applications. Open APIs also enable rich mashups through composition of open APIs of various domains. This paper presents design of open APIs for microgrid, in order to enable easy and various microgrid application...
This paper proposes a three-phase microgrid which consists of two renewable energy sources, an energy storage, and a power conditioning system (PCS). The renewable energy generated from the photovoltaic arrays is provided to a load and the storage through an inverter and a charger, respectively. The PCS coordinates the energy flow from the sources such as a utility grid and the renewable energy sources...
Internet of Things (IoT) has been prevailing to offer advanced connectivity of devices, systems, and services. As connected IoT devices have enhanced smart home, connected smart homes are expected to grow into smart community. However, several previous studies about smart community require a remote central server and do not consider local collaboration based on local direct communication networks...
This paper proposes a low-cost power line communication (PLC) module to monitor photovoltaic (PV) systems at panel level. The PLC module measures the voltage and current of four PV panels at a time. The aggregation time of monitoring PV panels is reduced down to one fourth. The installation cost of PV monitoring is expected to become one third by reducing the required number of PLC modules.
This paper proposes single-phase power conditioning system which is capable of connecting a microgrid to an utility grid seamlessly through slew-rate control. The power conditioning system is composed of a single-phase phase-locked loop using an inverse Park transformation to detect the grid phase, a phase synchronizer using the slew-rate control, and isolated bidirectional inverter which transfers...
A Photovoltaic (PV) system needs to monitor individual PV panels to maintain the performance. In a high-dense large-scale PV system, two characteristics can limit the use of communication technology. First, high density can degrade wireless communication performance due to the interference between densely deployed nodes. Second, a large-scale area can limit the communication distance in power line...
In smart grids, the current researches studies concerning how Distributed Energy Resources (DERs) could be initiated into the centralized electric power market. In this paper, we focus on the new framework for leading the small-scale DERs in intermediate bidding by assembling the varied DERs into the specific portfolio. We defined the 3 stakeholders in the arbitrage contract market for DERs. By analyzing...
We designed a system for Energy Interoperation conformance testing between an energy market and market participants based on TTCN-3. First, emerging energy markets for power trading are described. The previous works and the standards related to conformance testing of smart grid communication interfaces are introduced. After a brief overview of TTCN-3 standards published by ETSI, the functional architecture...
This paper proposes a closed transition transfer switch (CTTS) based on a photovoltaic inverter which is capable of transition between grid-connected and island modes. The proposed system consists of the CTTS, utility grid and photovoltaic inverter connected to each input, respectively, an active load with power factor correction, and a system controller. According to the grid condition, the system...
This paper proposes a single-phase microgrid based on a power conditioning system with dual photovoltaic array and an energy storage. A grid-connected inverter and battery charger are adopted for energy conversion from the two arrays of different construction. The power conditioning system based on a bidirectional inverter delivers power among grid, load, and storage using the grid-connected mode...
This paper describes a photovoltaic (PV) energy sharing system in a multifamily house. The community-shared PV system is connected to each home, monitors each home's energy use, and assigns more energy to a large energy-consuming home. Under increasing block tariffs, this architecture contributes to reducing total energy costs.
This paper describes an energy monitoring method that is applicable to home energy management system (HEMS). The typical HEMS employs a home server or a gateway to aggregate the energy consumption data, and uses ZigBee, PLC, or WiFi based connection-oriented communications as a data transmission method. The proposed method utilizes the connectionless communication of Bluetooth Low Energy as a data...
This paper shows an implementation of a smart office energy management system that use Bluetooth Low Energy (BLE) beacons, smart plugs, and a mobile app, which provides the location-aware energy-saving service without user intervention. Moreover, this paper provides a reasonable realtime energy-saving estimation method by which more effective feedback for motivation can be conveyed to the occupant...
Global energy demand grows rapidly. The building sector accounts for about 20% of world's energy consumption. Intelligent and systematic energy management technologies have been increasingly exploited to reduce the energy use in the building sector. Previous studies used their own decision model including knowledge-bases and rules. However, they are lack of a structural framework for organizing information...
This paper proposes a context-aware energy-saving efforts estimation method that is based on Bluetooth Low Energy beacons (BLE), PC agent, and mobile app. It is important to be properly rewarded for the individual effort to reduce energy consumption, particularly in the office environment. Hence, the intelligent method that makes it possible to perceive and differentiate the energy-saving efforts...
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