This paper presents an isolated regenerative active-clamped circuit designed for the current-fed half-bridge (IRACCFHB) converter. Its primary function is to reduce high voltage spikes across main switches caused by energy stored in leakage inductance of power transformer using a clamping capacitor. recovered delivered efficiently load, maintaining converter's efficiency and ratio. The proposed auxiliary employs single active switch with same ground reference as switches, eliminating need...

Industrial Control Systems (ICS) and Supervisory systems Data Acquisition (SCADA) networks implement industrial communication protocols to enable their operations. Unfortunately, wide used protocols, such as Modbus DNP3, lack basic security mechanisms that lead multiple vulnerabilities. The exploitation of flaws may greatly impact companies the general population, especially for attacks targeting critical infrastructural assets power plants, water distribution, railway transportation...

One of the major challenges at moment is improvement present street lighting system. These systems are considered outdated due lack communication capabilities, not allowing system feedback. This work aims to add capabilities already in use, through integration an IEEE 802.15.4 compatible transceiver photoelectric relay used turn HPS lamps on/off. change will each device into a node large wireless network across city.

This paper proposes a control network for LED street lighting system. The use of LEDs is being considered promising solution to modern systems, due their longer lifetime, higher luminous efficiency and CRI. proposed enables disconnection the system from mains during peak load time, reducing its impact in distributed power automatically at overload conditions. It also allows reduce consumption, decrease management cost monitor status information each unit. In order meet requirements, wireless...

This work proposes a light-emitting diode (LED) luminaire for street lighting based on modular drivers. Each module consists of driver composed by two integrated dc-dc converters. The first one is buck-boost converter responsible the power factor correction, and second buck that controls load current. Both converters operate in discontinuous conduction mode In order to make system robust against failure, each supplies an independent set LEDs. Thus, case failure or more drivers, not...

One of the major challenges at moment is improvement present street lighting system. These systems are considered outdated due lack communication capabilities, not allowing system feedback. This work aims to add capabilities already in use, through integration a ZigBeetrade compatible transceiver photoelectric relay used turn HPS lamps on/off. change will each device into node large wireless network across city.

This paper proposes a dispatchable photovoltaic (PV) hybrid inverter for output power tracking without any dependency on the converter’s efficiency and with no closed loop. The system uses an extra-low-voltage battery energy storage (BEES) based Li-ion pack to be applicable use inside homes other installations close end-user. A bidirectional isolated current-fed dual-active bridge (CF-DAB) converter associated batteries provides wide conversion voltage ratio ensures safety users. proposed...

The development of platforms and methods for test calibration phasor measurement units (PMUs) has drawn attention from the power systems community, especially due to wide range specific tests that must be performed. Aiming at reducing labor-intensive processes complexity such tests, this paper presents an automated platform test, calibration, performance assessment PMUs following IEEE Std C37.118.1. is composed signal-generation hardware software running on a personal computer. signals are...

This article presents the latest developments of a phasor measurement unit (PMU), hereby named <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">freePMU</i> , aimed at large-scale deployment in low-voltage distribution networks. The defining characteristics this device are its low cost, general-purpose hardware architecture, and software now made open source. PMU has already been shown to reliably measure voltage, angle, frequency events real...

This paper present the developments of a low-cost Phasor Measurement Unit (PMU) for smart grid monitoring. PMU is being developed large-scale use in distribution system allowing to monitor local and transmission level events. The device provides magnitude, angle frequency data AC voltage synchronized way, between any point electrical system, even geographically distant. instrumentation designed connect low network. For acquisition processing employed general purpose hardware with...

This paper proposes a circuit to compact lamp based on light emitting diodes (LEDs). It aims energy savings, high luminous efficiency and useful life with the replacement of incandescent or fluorescent lamps by LEDs without any change in electrical system installation. In order supply mains constant current, Buck converter has been used because it provides an output voltage lower than input one. The designed 36 52 high-brightness connected series, resulting between 90 V 187 V. load can also...

This paper presents a compact emergency lamp using light emitting diodes (LEDs). The goal is to develop and low cost electronic circuit drive control the current of LEDs arranged in single enclosure. proposed idea allows same equipment daily activities, supplied by mains, under possible failure it. proposal aims energy saving, high luminous efficacy useful life when replacing traditional lighting systems, fluorescent lamps LEDs. use E-27 socket (the used incandescent lamps), provides...

This paper presents a comparative study between different types of stage connections DC-DC converters used in street lighting systems based on LEDs. One the is technique known as Reduced Redundant Power Processing (R <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> P ) and other traditional series connection. The SEPIC Buck-Boost were implemented power factor correction control stages, respectively. Both operate discontinuous conduction...

This paper presents a modular topology for the design of luminaire street lighting based on LEDs. Each module consists driver which is composed by two integrated DC-DC converters. The first one sepic converter responsible correcting power factor, and second buck control delivered to load. Both converters are operating in discontinuous conduction mode (DCM). In order make system more robust against failure, proposes that each supply an independent set LED. Thus, case failure or individual...

This paper presents the development of a platform for automatically testing Phasor Measurement Units (PMU). In order to develop such platform, it is proposed multitasking application PMUs in accordance Synchrophasors Standard IEEE C37.118.1-2011. The managed by personal computer with visual interface, which allows user configure signal parameters as well apply automated tests set out standard. Until this stage development, only steady-state were implemented and exposed result. At first,...

Multi-channel wireless sensor networks exploit the capability of nodes to tune its radio over different channels communicate. The main goal multi-channel communication is achieve improved throughput, delivery ratio and cause/suffer less interference in network. However, optimally assigning has been shown be a hard problem. Thus, recently game theory used design protocol, termed GBCA (Game-Based Channel Allocation), that able topology routing information (TIRI) for sub-optimally distributed...

This paper discusses phasor and frequency estimation techniques with low computational cost for measurements in the power system. The objective of is to investigate use hardware improve accuracy while maintaining cost. algorithms are usually based on Discrete Fourier Transform (DFT) obtained by angle derivation. strategy consists controlling sampling rate minimize DFT spectral leakage. control performed from estimated frequency, ensuring even changes electrical system frequency. proposed...

Using batteries and supercapacitors as hybrid energy storage systems (HESS) is advantageous due to the flexibility between high density of power supercapacitors. Additionally, intermittent generation renewables, such photovoltaic (PV), offers a promising application for these HESS. This paper proposes an off-grid converter with Li-Ion elements. It includes all converters' modeling controller design. Also, rule-based management system described. Simulation results, based on...

In Supervisory Control Theory (SCT) of Discrete Event Systems, event refinements have been exploited to simplify modeling tasks. Approximations complement this approach with an alternative also reduce synthesis effort. spite advantageous and synthesis, do not directly cover the SCT implementation phase. general, controllers obtained without are expected be implemented equivalent hardware cost. This paper presents a decentralized architecture that extends gains provided by from...

One of the major challenges at moment is improvement present power system. The traditional industry outdated, but responsibility not just in utility side. consumer being forced to perform a high quality load and ration consumption. A way improve system turn it intelligent, through network. In this study, we analyze features set control fieldbuses summarize main specific fieldbus for management.

Synchrophasor technology has received considerable attention in the past few years due to its unique ability characterize dynamics of power systems and therefore this paper proposes a low computational cost method estimate harmonic synchronized phasors for electrical monitoring. The main goal is magnitude, phase, frequency not only fundamental but also components signals. Such simple deploy embedded platforms with limited computation resources hence it suitable development low-cost phasor...