Abstract
Power system modes can be controlled by use of a wide-area monitoring and control system (WAMS). It is based on the phasor measurement units (PMUs), connected by an infor-mation network covering a significant territory. The functioning reliability of such a network deter-mines to a big extend the correct operation of the entire monitoring system. To assess its reliability, the one can be decomposed conveniently into four components: hardware or technical reliability, traffic reliability, software reliability, resistance to external negative impact on the transmitted in-formation, and to consider each m independently. In this paper, the main attention is paid to as-sessment of the reliability and availability of the first three components in the information network.
Highlights
The need for a correct assessment of the power system state has led to the creation of the Wide Area Measurement Systems (WAMS)
It is based on the measuring technology of phasors, on the Phasor Measurement Unit (PMU) by the signal of global navigation systems, which ensures the simultaneous measurement of phasors [1]
The network reliability includes four components, as fellows: 1) Hardware or technical reliability associated with the failure of transmission channel elements or the integrity of communication lines; 2) Traffic reliability, determined by the temporary data loss or distortion without failure of the transmission channel element; 3) Software reliability due to errors in the development of exchange execution programs; and
Summary
3-5-4 and backup information exchange channels and the availability and characteristics of channels with redundancy are calculated. We use the search algorithm first in depth and in breadth, as proposed in [5] It allows to take into account the failed links to find a backup route, if one exists, or to warn of its absence. The “Reserve channel” column of the Table 1 is built and the hardware found path reliability is evaluated. Traffic reliability lies in the information transmission in due time without losses and distortions associated with the loading of the exchange channel. The information frame from the generation unit or power line, formed by each PMU, combines 9 vector measurements: 3 currents and 3 voltages (magnitude and phase),. The approximate channel bandwidth in Kbit/s is given in Table 3 depending on the number of source devices and the sampling rate taking into account a margin of 10%, [6].
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