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Substation DC system is the power supplier of protect and communication devices in substation, which plays a significant role for the secure and reliable performance of substation. Onsite substation DC system maintenance required a large number of man power and money in the past. However, with the technique of DC system intelligent maintenance, it will monitor and maintain the DC system automatically...
This paper focuses on the design of zero energy consumption for small building system that can support the government energy efficiency plan (EEP 2015). The design suits for small residential home in Bangkok that the energy consumption is up to 1,500 Wh/day. This paper designs the off-grid photovoltaic (PV) system which its structure consists of 3 main parts: generation, storage, and load. Experimental...
This paper presents real time issues faced in the practical implementation of the zigbee based battery status monitoring and charge sharing system. For experimental evaluation four autonomous wheeled robots or nodes were designed. All these nodes were integrated with battery status indicators, Zigbee transceiver modules and obstacle detection sensors for collision avoidance. Only two robots were fitted...
Recent advances in circuits have enabled significant reduction in the size of wireless systems such as implantable biomedical devices. As a consequence, the battery integrated in these systems has also shrunk, resulting in high internal resistances (∼10kΩ). However, the peak-current requirement of power-hungry components such as radios remains in the mW range, and hence cannot be directly supplied...
Underwater Wireless Sensor Network (UWSN) is newly emerged and developed branch of Wireless sensor technology. In UWSN small sensor nodes with limited battery and limited memory are deployed in underwater environment. Due to multiple differences from terrestrial Wireless Sensor Networks (WSN), radio waves cannot be used in underwater communication. Acoustic channels are used for communication in sea...
Debugging field failures can be a challenging task for app-developers. Insufficient or unreliable information, improper assumptions and multitude of devices (smartphones) being used, are just some of the many factors that may contribute to its challenges. In this work, we design and develop an open-source framework that helps to communicate, localize and patch energy consumption related field failures...
The Internet of Things (IoT) is being applied in a wide variety of applications, which demand a range of networking support. This includes wide area communication networks. Novel long range network technologies such as LoRa and Sigfox are emerging, but they remain difficult to deploy and configure for end-users who are not specialists in embedded systems. This paper addresses this problem by introducing...
Physical indicators are directly related with health and fitness of human body. By employing real-time e-health monitoring systems for acquiring, and analyzing bio-signals by measurements such as electrocardiogram (ECG) and electromyography (EMG), it is possible to extract information to achieve better health-care in terms of observation, diagnosis, and treatment. However, those systems are limited...
One of the major functions of a Wireless Sensor Network (WSN) is to provide the coverage to the network area. Many critical applications require different levels of coverage in the different parts of the network area which is generally called differential coverage. Providing differential coverage service in different period of time is a challenging due to the limited capabilities of the network nodes...
In this paper a portative device for the ambient temperature and air humidity controlling is described. The source of power for the developed device is a general-purpose battery and an original energy harvester. The ambient parameters values are transmitted to a personal computer through radio-frequency identification (RFID) connection. Described device is also applicable as a wireless link which...
There is a growing interest in the use of smartwatches to collect real-time physical activity and health care data. Much of this information is useful only when the person is wearing the smartwatch. Collecting data during other times consumes precious battery life and potentially communication bandwidth to relay the information. An approach that can correctly classify temporal regions during which...
This paper presents a method of analysis of the acquired data to achieve predictive maintenance of power supply equipment used in telecommunication system. The statistical analysis of the failure can identify the critical subsystem and components which, can stop the equipment supply when a malfunction may occur for these components. After identifying the signals to be acquired, the hardware interface...
An autonomous underwater camera is developed for monitoring the red snow crab habitat in deep sea. Most of the deep sea cameras are designed such that they can be used with special deep sea exploration instruments such as underwater vehicles. However, a developed camera can be attached to the fish traps for catching the red snow crab, and fishermen who are not underwater camera experts can handle...
Mobile healthcare systems have great potential for continuous monitoring. These devices are often battery operated. Thus energy management in these wearable, wireless devices is a big challenge for longer durations. In this paper a systematic review of various techniques suggested in literature for energy efficiency and management in such wireless devices is presented. Various research efforts made...
Wireless Sensor Network (WSN) is an integration of simple sensing, processing, storage and communication technology into cheap miniature sized devices. Distributed WSN is used for ambient intelligence, where tiny senor nodes sense, process and communicate signals to the base station (BS) for smart decision making. Nodes are deployed randomly in any unattended area for monitoring any physical attribute...
Variability associated with input to any PV system is one of the major factors that command the output of the system. In addition to it, technology used, weather conditions, geographical location, local latitude etc. also decide the performance of any solar photovoltaic system. In this paper, the performance of a 40kWp solar photovoltaic plant installed in Faculty of Arts, Dayalbagh Educational institute,...
This paper introduces the Microgrid Energy Manager (MEM), a plug-and-play platform for microgrid management. MEM is an end-to-end solution for monitoring, control, and management of AC, DC, and hybrid microgrids. We introduce the application of MEM for low voltage DC microgrids. Under the umbrella of MEM, a key component is the homegrid, which is managed locally by the Homegrid Energy Manager (HEM)...
This paper presents an innovative approach to tackle the crisis of electrification of off grid and near off grid homes by using the innovative Inverterless Solar DC system. Improved efficiency, lower cost and robust design makes it a very attractive solution. Inverterless system is not only cost effective to power off grid homes but as and when grid becomes available, it can be seamlessly integrated...
Power-on reset (POR), power supply monitor (PSM) and control of DC-DC converters are required circuits in embedded systems. Mobile systems often need special power down modes where these three functions POR, PSM and DC-DC control must be executed taking less than 1μΑ of current in total. Traditional design techniques meet a fatal area problem as they try to reduce current by increasing the area of...
This paper is concerned to design of direct coupled solar water pumping system without using batteries. Technical, economic and environmental parameters are considered in the design procedures. Performance evaluation of solar water pumping system is studied using three expressions; yield factor (YF), wire to water energy efficiency (WWEE) and system performance index (SPI). A full monitoring system...
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