Authors:
Tat’yanaG. Zatsarinnaya,KonstantinP. Anikevich,AlexandrA. Skidan,SvetlanaA. Kachur,KirilB. Matuzaev,YuriyV. Braslavskiy,DOI NO:
https://doi.org/10.26782/jmcms.spl.10/2020.06.00028Keywords:
Automatic control system,power unit,modernization,turbine installation,frequency,turbine generator,electronic speed controller,efficiency,reliability,automation,safety,Abstract
First and foremost, operation of nuclear power facilities is inseparably linked with solving the problems of their safety. To enhance safety, assure high reliability and effectiveness of controlling power units, software and hardware (SH) for computer-assisted control over a power unit [VIII, IX, XIV, V] are introduced, with electronics of electro-hydraulic governing systems of turbines (EHGS). EHGSis the principal system, which ensuresfunctioning of turbine in all stationary and intermittent operationmodes. Quality and reliability of supplying power to consumers directly depend on one function of the system for governing turbine, namely, on automatic frequency-capacity control. According to the existing standards of document [XVIII], regulation of frequency is specified by: the value of and time for mobilizing reserves, frequency droop, and dead-band of automatic control system (ACS). A response from power unit to changes in frequency shall be such that, when the value of drooping is fixed, a half of the required alteration in the power unit capacity is to be made within 10s, and 100% – within 30s. The standard specification prescribes the following recommended frequency droops for NPP turbines: 4…6%, recommended dead-band of the primary frequency regulation: a maximum of 0.02 Hz. Such requirements may bemet rather well, when using turbines equipped with electronic speed controller (ESC), which eliminates frequency deviations withhigh accuracy and makes it possible to promptly adjust the degree of irregularity and dead zone of frequency controller.Hence, to introduce standard primary and automatic secondary controlson the involved NPPs, pursuant to the modern requirements, a need has arisen to modernize their equipment. The design schemes of the systems for controlling steam turbines of NPPs had undergone changes, related to making electronics more sophisticated and simplifying hydraulics. However, in general, modernization has enhanced efficiency and reliability of the turbines’ ACSs. The data of rough calculation of structural reliability of the designed and newly modernized hydraulic systems, presented in this article, prove the results of quantitative assessment of reliability. A comparative analysis is given of standby and design ACSs of turbine К–1000–60/1500–2 considering major technical parameters and functional capabilities.Refference:
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