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Dr. A. M. Sharaf; Bo Yin; M. Hassan

A Novel On-line Intelligent Shaft-Torsional Oscillation Monitor for Large Induction Motors and Synchronous Generators. Dr. A. M. Sharaf; Bo Yin; M. Hassan. University of New Brunswick May 1-4, 2005. PRESENTATION OUTLINE. Introduction Modeling details for -Synchronous generators

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Dr. A. M. Sharaf; Bo Yin; M. Hassan

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  1. A Novel On-line Intelligent Shaft-Torsional Oscillation Monitor for Large Induction Motors and Synchronous Generators Dr. A. M. Sharaf; Bo Yin; M. Hassan University of New Brunswick May 1-4, 2005

  2. PRESENTATION OUTLINE • Introduction • Modeling details for -Synchronous generators -Induction motors • Sample dynamic simulation results • Conclusions

  3. Introduction What is Subsynchronous Resonance (SSR)? Subsynchronous Frequency: • Subsynchronous resonance is an electric power system condition where the electric network exchanges energy with a turbine generator at one or more of the natural frequencies of the combined electrical and mechanical system below the synchronous frequency of the system. • Example of SSR oscillations: • SSR was first discussed in 1937 • Two shaft failures at Mohave Generating Station (Southern Nevada, 1970’s) Where: - Synchronous Frequency = 60 Hz - Electrical Frequency - Inductive Line Reactance - Capacitive Bank Reactance

  4. Introduction • Categories of SSR Interactions: • Torsional interaction • Induction generator effect • Shaft torque amplification • Combined effect of torsional interaction and induction generator • Self-excitation • Other sources for excitation of SSR oscillations • Power System Stabilizer (PSS) • HVDC Converter • Static Var Compensator (SVC) • Variable Speed Drive Converter

  5. Modeling for Synchronous Generator Sample Study System Figure 1. Sample Series Compensated Turbine-Generator and Infinite Bus System Figure 2. Turbine-Generator Shaft Model Table 1. Mechanical Data

  6. Modeling for Synchronous Generator Figure 3. Matlab/Simulink Unified System Model for the Sample Turbine-Generator and Infinite Bus System

  7. Modeling for Induction Motor Figure 4. Induction Motor Unified System Model

  8. The Intelligent Shaft Monitor (ISM) Scheme Figure 5. Proposed Intelligent Shaft Monitoring (ISM) Scheme

  9. The Intelligent Shaft Monitor (ISM) Scheme - The result signal of (LPF, HPF, BPF) = 377 –Radians/Second T0 = 0.15 s, T1 = 0.1 s, T 2 = 0.1s, T3 = 0.02 s Figure 6. Matlab Proposed Intelligent Shaft Monitoring (ISM) Scheme with Synthesized Special Indicator Signals ( )

  10. Control System Design Figure 7. DFC Device Using Synthesized Damping Signals ( ) Magnitudes

  11. Simulation Results for Synchronous Generator without DFC Compensation without DFC Compensation Figure 8. Monitoring Synthesized Signals ( ) Under Short Circuit Fault Condition

  12. Simulation Results for Synchronous Generator with DFC Compensation with DFC Compensation Figure 9. Monitoring Synthesized Signals ( ) Under Short Circuit Fault Condition

  13. Simulation Results for Synchronous Generator without DFC Compensation without DFC Compensation Figure 10. SSR Oscillatory Dynamic Response Under Short Circuit Fault Condition

  14. Simulation Results for Induction Motor Without Damping DPF Device With Damping DPF Device Figure 11. Monitoring Signals P & Q Figure 12.Monitoring Signals P & Q

  15. Simulation Results for Induction Motor Without Damping DPF Device With Damping DPF Device Figure 13. Shaft Torque Oscillatory Dynamic Response Figure 14. Load Power versus Current, Voltage Phase Portrait

  16. Conclusions • For both synchronous generators and induction motor drives, the SSR shaft torsional oscillations can be monitored using the online Intelligent Shaft Monitor (ISM) scheme. • The ISM monitor is based on the shape of these 2-d and 3-d phase portraits recognition and polarity of synthesized signals • The proposed Dynamic Power Filter (DPF) scheme is validated for SSR torsional modes damping

  17. Thank You & Question ?

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