Reader's guide to subsynchronous resonance - IEEE Xplore
2002年8月6日 · But the hazards to turbine-generators require that utility engineers fully understand and thoroughly analyze the effects of subsynchronous resonance (SSR) caused by series capacitors. To help in the understanding and analysis of SSR, the authors consolidate and review the key issues.
Subsynchronous Oscillation and Advanced Analysis: A Review
2020年12月14日 · Subsynchronous oscillation (SSO) is classified as subsynchronous resonance, torsional interaction, or control interaction, depending on which devices or controllers are involved. Researchers have conducted numerous studies and developed methodologies on how to analyze SSO cases in different types of power systems.
Typical resonant frequencies of Thermal Generator Turbine units are in the range of 15-25 Hz. 1. Self Excitation (Induction generator effect) Generator ‘acts’ as a NEGATIVE resistance at the sub synchronous frequencies.
Subsynchronous resonance is an electric power system condition where the electric net- work exchanges energy with a turbine generator at one or more of the natural fre- quencies of the combined system below the synchronous frequency of the system.
introduce a resonance (a condition where the combination of equivalent induct ance and capacitance of the network is either zero or infinite) in the network impedance at frequencies below 60 Hz (sub-synchronous).
In such cases, Sub-Synchronous Resonances (SSR) may arise, leading to oscillatory phenome-na on the multi-mass shaft of genera-tors which could be poorly damped, undamped or even amplified. Increas-ing torsional oscillation creates risk of fatigue and damage to the rotor shaft assembly of turbine-generator sets.
Subsynchronous resonance is a condition that can exist on a power system wherein the network has natural frequencies that fall below the nominal 60 hertz of the network applied voltages.
Sub Synchronous Oscillation Phenomenon | Encyclopedia MDPI
2022年12月9日 · According to the classification of SSO by the IEEE Sub Synchronous Resonance Working Group, there are two types of SSO, namely sub synchronous resonance (SSR) and device dependent sub synchronous oscillation (DDSSO). Sub synchronous control interaction (SSCI) and sub synchronous torsional interaction (SSTI) are other types of SSO.
”An analysis of subsynchronous resonance problems requires a clear understanding of the physical relationships that produce the phenomenon.” The damping is very small. Time constant for damping is in the order of a few seconds up to half a minute. Damping increases with loading.
Existing SSR equipment only look at Sub-Synchronous currents. SSR Current from 0,1% up to several percent of fundamental component. Extremely good filtering is required. SSR currents depends on the power system impedance at SSR frequencies. SSR voltages even smaller than the currents, but detectable.