Nationwide Differential Global Positioning System (NDGPS) network uses Telemetering, voice communications, supervisory control, etc. Applications of PLC include protective relaying, Uses signals in the 40-490 kHz range that couple to and propagate over Power line carrier (PLC) is an important technique usedĮxtensively on electric power lines for communication and telemetry. Where remote stations are classified according to their real-time Management is supported using a priority-based medium access protocol, In particular, concurrent transmission ofĭistribution automation commands and responses with demand side Shows how the requirements for a hybrid DA/DSM power line communication
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Opportunity to upgrade to evolving application protocols. This guaranteesĮase of integration in existing telecontrol systems and provides the Investment of the user by adhering to open standards. Furthermore, the communication system should protect Single communication system for both DA and DSM applications is Together with robustness with respect to topology changes due to DA Order of magnitude higher than those of today's well-introduced systems) These requirements call for higher data rates (about an Require support of real-time communication and event-driven operation ofĮnd devices.
Most of these systems achieve limitedĭata rates of up to 1 kbit/sec.
(DSM) applications such as automatic meter reading have been available As a result, additional monitoring costs are eliminated by using the proposed technique instead of SCADA or Ethernet-based systems.ĭistribution line carrier (DLC) systems for demand side management The current, voltage and power data generated by the photovoltaic (PV) panels are successfully monitored over transmission lines owing to the developed system. In order to overlap QPSK modulated data to the three-phase transmission line at the inverter and grid sides a coupling interface is also designed in the study. The power line communication (PLC) infrastructure employed is based on Quadrature Phase Shift Keying (QPSK) modems. The modelled transmission line is not only used to carry the generated voltage but also to transmit the generated power rate of the solar plant in real-time. The DC–AC conversion system proposed in this paper covers a solar power plant with a maximum power point tracking system and IGBT based three-phase inverter to generate three-phase AC line voltages. These processes concerning renewable energy sources are analyzed in this paper in order to propose a solution for solar power systems. Monitoring and metering processes are required to be performed in renewable energy conversion systems like smart grid applications of the conventional grid system. The simulation results fit the measured data quite well and verify the feasibility of the proposed modeling scheme. Based on the general topologies of the LV distribution networks, a new method with the help of the reflection matrix based on the multiconductor transmission line theory is proposed to model the channel transfer functions, taking into account of the source inner impedance matrix. Considering the signal's attenuation, the lower frequency range from 2 to 10 MHz is more suitable for the high-speed data access system. It is almost impossible to use the frequency range from 10 to 20 MHz for the reliable communications from distribution transformer to end user, so it must be solved with the aid of such means as the repeater and the modulation schemes. The testing results show that the main reason influencing the reliable communication of high-speed data of power line is the attenuation of the high-frequency signal, which exhibits more obviously in the branch of power line. This paper presents the measurement results of channel properties of LV PLC systems after giving a general overview of the topologies for the typical LV distribution networks in China. In order to provide communications services with different priorities under the smart grids environment, it is a must to design a completely new PLC system with variable information rate, which means understanding of the LV PLC channel characteristics become vital. With the decision to construct the smart grids around China, the power line communications (PLC) on the low-voltage (LV) distribution networks have become one of the potential technologies to commute the information between the end users and the power provider.
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