Abstract
AbstractThe ways to increase the reliability of time-synchronization signals of power systems are considered. The features of the development, research, and implementation of a system for automated multi-channel monitoring of time-synchronization devices are presented. The necessity of simultaneous measurements of several signals of time-synchronization devices and the use of IP technologies for the transmission of digital measurement data is determined. The description of the developed schemes of the multi-channel monitoring device, which includes: LPC2378 microcontroller, programmable logic chips “ALTERA”, electronic elements of the RS-232 interfaces, Ethernet, is presented. Theoretical and probabilistic studies of the stability of characteristics of multi-channel monitoring device in real operating conditions on the objects of electric power networks are carried out. The influence of changes in the ambient temperature, supply voltage, frequency-dependent parameter, and frequency of the time-synchronization signal on the variable of deviation of pulse duration of the finite signal of single vibrator from the nominal value are considered. Analytical dependencies were obtained to determine the estimation of the actual value and confidence area for the deviation of the variable of pulse duration of the finite signal of single vibrator in the real operating conditions of the device. The actual operating variable of the deviation of pulse duration of the finite signal of single vibrator and the conditions of optimal temperature stability of the device for multi-channel monitoring of time-synchronization signals of power systems are determined. Laboratory samples of functional parts and a prototype of multi-channel monitoring device were made; their adjustment and testing were performed. Experimental studies were conducted using the receivers of the GPS satellite navigation system, which confirmed technical capability of the device to carry out a reliable real-time monitoring of four time-synchronization signals simultaneously. The use of the obtained digital monitoring data allows to improve the quality of time-frequency support and, as a result, to increase the reliability and energy efficiency of SMART Grid power systems.KeywordsPower systemSMART gridTime-synchronization devicesFinite signalAutomated systemMulti-channel monitoringDeviation of the time interval
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