Study of turbine-generator shaft parameters from the viewpoint of subsynchronous resonance

1996 ◽  
Vol 18 (6) ◽  
pp. 371-376 ◽  
Author(s):  
E.S. Ibrahim
Keyword(s):  
Turbine Generator ◽  
Subsynchronous Resonance

Subsynchronous Interaction and its Mitigation in DFIG-Based Wind Farm and Turbine-Generator Bundled Systems

2013 ◽  
Vol 860-863 ◽  
pp. 319-323 ◽  
Author(s):  
Xin Yao Zhu ◽  
Hai Shun Sun ◽  
Jin Yu Wen
Keyword(s):  
Wind Farm ◽  
Reactive Power ◽  
Turbine Generator ◽  
Subsynchronous Resonance ◽  
Turbine Generators ◽  
Grid Side ◽  
Grid Side Converter ◽  
Multi Mode ◽  
Additional Device ◽  
Control Interaction

This paper investigates the subsynchronous interactions (SSI) in DFIG-based wind farm and turbine-generator (T-G) bundled system which is integrated through series compensated transmission line, the results reveal that the integration of DFIG-based wind farm could improve the subsynchronous resonance (SSR) damping of the nearby turbine-generators. Then supplemental controls of DFIG-based wind farm are used to mitigate subsynchronous control interaction (SSCI) of the DFIG and multi-mode SSR of the nearby turbine-generators. The supplemental controls are added to the reactive power control loop of GSC (grid side converter) for DFIG. Given that no additional device is needed, this supplemental control could be the most promising measure for SSR and SSCI mitigating.

Subsynchronous Resonance and Torsional Effects on a Steam Turbine Generator in Transmission Systems With Series Capacitor Compensation

2012 ◽  
Author(s):  
K. R. Mutama ◽  
J. Seeliger ◽  
D. H. Baker ◽  
R. D’Aquila ◽  
B. Fitzgerald ◽  
...  
Keyword(s):  
Steam Turbine ◽  
Operating Conditions ◽  
Torsional Stress ◽  
Turbine Generator ◽  
Transmission Systems ◽  
Torsional Oscillations ◽  
Subsynchronous Resonance ◽  
Modeling Studies ◽  
Series Capacitor ◽  
Series Capacitors

Turbine-generators which connect to transmission systems with series capacitor compensated lines can experience problems with the torsional oscillations of the shaft interacting with the electrical oscillations of the series capacitors and transmission system inductance. This resonant interaction is called Subsynchronous Resonance (SSR) since it involves torsional and electrical oscillations which are below the synchronous operating frequency of the power system. The transmission lines near the Newmont TS Power Plant will soon have series capacitors installed. Modeling studies based on calculated torsional frequencies and estimated torsional damping showed that the turbine-generator could have instabilities of the torsional oscillations under some operating conditions. After the modeling studies were completed, actual tests on the steam turbine generator were conducted to measure the frequency and mechanical damping of the torsional oscillations. Field measurements validated modeling studies and showed the SSR risk may be higher than originally estimated. As a result of these investigations, a torsional stress relay is being installed to protect the unit from subsynchronous torsional effects of the series capacitors. The torsional stress relay will trip the unit if damaging torsional oscillations or torsional instabilities occur.

scholarly journals Subsynchronous Resonance and FACTS-Novel Control Strategy for Its Mitigation

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Doan Duc Tung ◽  
Le Van Dai ◽  
Le Cao Quyen
Keyword(s):  
Power System ◽  
Transmission Lines ◽  
Control Strategy ◽  
Power Plants ◽  
Thermal Power ◽  
Transmission System ◽  
Static Synchronous Compensator ◽  
Turbine Generator ◽  
Subsynchronous Resonance ◽  
Ac Transmission

The subsynchronous resonance (SSR) is an important problem in the power system, and especially the series compensated transmission lines may cause SSR in the turbine generators, such that it leads to the electrical instability at subsynchronous frequencies and potential turbine-generator shaft failures. Taking the Vietnamese Vungang thermal plants as an example, a shaft failure of Vungang I thermal power unit has occurred on November 24, 2015, due to SSR. The main cause for this failure is a resonance caused by the series capacitors on the 500 kV grid. This paper analyzes the SSR based on the location of shaft cracks and turbine generator mode shape for Vungang I and II thermal power plants. On the basis of that, it develops a novel control strategy for each Flexible AC Transmission system (FACTS) device as the thyristor controlled series compensator (TCSC), static VAR compensator (SVC), and static synchronous compensator (STATCOM). Then they are comparable to one another in order to choose a feasible solution for mitigating the SSR. The effectiveness of the proposed control strategy is verified via time domain simulation of the Vietnamese 500/220 kV transmission system using EMTP-RV and PSS/E programs. The obtained results show that the proposed strategy for SVC can be applied to immediately solve the difficulties encountering in the Vietnamese power system.

scholarly journals Study of turbine-generator shaft parameters from the viewpoint of subsynchronous resonance

1982 ◽  
Author(s):  
F. de Mello ◽  
K. Chang ◽  
L. Hannett ◽  
J. Feltes ◽  
J. Undrill
Keyword(s):  
Turbine Generator ◽  
Subsynchronous Resonance

scholarly journals ANALYSIS OF SUBSYNCHRONOUS RESONANCE EFFECT IN SERIES COMPENSATED LINE WITH BOOSTER TRANSFORMER

2013 ◽  
pp. 59-63
Author(s):  
G.V. RAJASEKHAR ◽  
GVSSNS SARMA
Keyword(s):  
Resonance Effect ◽  
Power Networks ◽  
Turbine Generator ◽  
Subsynchronous Resonance ◽  
Three Phase ◽  
Electric Power Networks ◽  
In Series ◽  
Negative Damping ◽  
Series Capacitor Compensation ◽  
Series Capacitor

Series compensation has been successfully employed for many years in electric power networks. Series capacitor compensation has a tendency to act as a negative damping on torsional vibrations of nearby turbine generator units. However, their presence in the system may lead to the Sub-synchronous resonance (SSR) phenomenon especially for the nearby generating plants that have a direct or a near radial connection to series capacitor compensated line. In an attempt to analyze the SSR phenomenon, analysis has been done on Second Benchmark model system using both frequency analysis and eigenvalue techniques with three phase fault for different compensation levels. This analysis has been carried out using Matlab control system toolbox.

Sign in / Sign up

Export Citation Format

Share Document