Influence of operating conditions on hydrounit power oscillations

Author

Brezovec, Miljenko ; Brkljac, Blazenka ; Kuzle, Igor

Author_Institution

HEP Proizvodnja d.o.o., Varazdin, Croatia

fYear

2013

fDate

1-4 July 2013

Firstpage

1453

Lastpage

1459

Abstract

Because of many different instability reasons, power unit stability problems should be analyzed in details for each specific case. This paper describes a specific case of power oscillations problem of hydroelectric power unit with double regulated bulb turbine. In some working conditions, natural frequency of electromechanical oscillations could be close to the rotor speed frequency and small disturbance on turbine would be amplified few times because of electromechanical resonance. Influence of operating conditions on natural frequency is analyzed using mathematical model of synchronous machine with excitation system. Simulation model results show that natural frequency decreases significantly with active power increase and near maximum active power becomes close enough to the rotor speed frequency to enter resonance mode.

Keywords

hydroelectric power; oscillations; power system stability; rotors; synchronous machines; turbines; active power; electromechanical oscillations; electromechanical resonance; hydroelectric power unit; hydrounit power oscillations; natural frequency; operating conditions; power oscillations problem; power unit stability problems; rotor speed frequency; synchronous machine; Eigenvalues and eigenfunctions; Frequency measurement; Mathematical model; Oscillators; Reactive power; Resonant frequency; Rotors; bulb turbine; excitation system; hydropower unit; power oscillations; power system stabilizer; synchronous machine;

fLanguage

English

Publisher

ieee

Conference_Titel

EUROCON, 2013 IEEE

Conference_Location

Zagreb

Print_ISBN

978-1-4673-2230-0

Type

conf

DOI

10.1109/EUROCON.2013.6625169

Filename

6625169