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Scott Bonnett – Candidate 1
Purpose & Content of This Presentation
Purpose • To confirm my interest in the position of Project Engineer - PSS (224) • To demonstrate that this kind of analysis is within my capability • To provide a basis for further discussions with S&C
Content • Simulation of a power quality case study previously reported by E. Camm (et. al.)
• Capacitor switching at main grid caused nuisance overvoltage trips at customer • Pre-insertion inductors identified as a way to fix the problem • Details in Reference 1
• Simulation performed by Scott Bonnett using Matlab / Simulink simulation tool • Model configured & parameterized according to information in Reference 1
• Not all component parameters were known, some were tuned to match paper • Some were set to values found in Mathworks power system example models
Scott Bonnett – Candidate 3
Model Components
100kV Source
600kvar Cap
Customer Load
Transformer (100kV->12.47kV)
Transformer (12.47kV->480V)
900kvar Cap
450kvar Cap
Substation Load
Transmission Lines
Pre-Insertion Inductor
57.6Mvar Cap
Breaker
Scott Bonnett – Candidate
Without Pre-Insertion Inductor With Pre-Insertion Inductor
Simulation Results
4
100kV Bus (volts)
480V Bus (volts)
Scott Bonnett – Candidate 6
Additional Analysis - Disturbance Response
• Model configured such that a disturbance can be overlaid on the 100kV source • Transfer function input is disturbance signal from the 100kV source • Transfer function output is the voltage at the 480V customer site • Transfer function analysis used to determine contributions due to separate factors • Analysis cases (see next slide)
• No capacitors, transmission lines only • No transmission lines, capacitors only • Both transmission lines and capacitors present
Transfer Function Input Transfer Function Output
Input Output
Scott Bonnett – Candidate 7
Disturbance Response Plot
This plot shows that although some frequency separation exists between transmission line and capacitor bank resonances, the two will still couple dynamically.
Scott Bonnett – Candidate 8
Summary & Discussion
Summary • Solution that was found to work in original paper was confirmed in this simulation
• Pre-insertion inductors upstream of 100kV cap bank Discussion • System modeling, simulation, and controls analysis has been part of my day to day
work for over 20 years • In the references I also read about S&C’s work with reactive compensators and PWM
based voltage controls • I have simulated both in the context of aircraft power systems in the past
• Financial feasibility calculations were not part of this presentation, however: • I earned an MS in Finance at IIT, which included net present value calculations
• Perhaps adaptive control techniques have application in power system controls? • My MS thesis focused on system identification and adaptive speed control of a
hydropower turbine
Scott Bonnett – Candidate 9
References
1. Main: “Solving Customer Power Quality Problems Due To Voltage Magnification”,
R.A. Adams, S.W. Middlekauff, E.H. Camm, J.A. McGee, PE-384-PWRD-0-11-1997, IEEE / PES Winter Meeting, 1998.
2. “Preventing Overvoltage Tripping of Adjustable Speed Drives”, E.H. Camm, Plant Engineering, S&C edoc_001584, February 2004.
3. “Evaluating Advanced VAR Compensators for Improved Power System Stability”, E.H. Camm, S&C edoc_027268, October, 2004.
4. “Design Considerations For Large Collector Systems”, E. Camm, North American Wind Power, S&C edoc_045122, December 2006.
5. “Shunt Capacitor Overvoltages and a Reduction Technique”, E.H. Camm, S&C edoc_024494, April 1999.
6. “Current Limiting Inductors Used in Capacitor Bank Applications and Their Impact on Fault Current Interruption”, T.A. Bellei, E.H. Camm, G. Ransom, S&C edoc_002794.
7. “Dynamic Reactive Power Control for Wind Power Plants”, E.Camm, C. Edwards, K. Mattern, S. Williams, Techwindgrid 2009 Grid Integration Seminar.
8. “Substation Capacitor Bank Switching & Protection Design Considerations”, E.H. Camm, S&C Electric Company, June 2014.
Scott Bonnett – Candidate 10
Thank You
Thank you for your time! I would be glad to discuss the position further at S&C’s convenience. Scott Bonnett 815-262-8712 [email protected]