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Field Flashing a Synchronous Generator Using Batteries
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Team “Flash” Members
● Will Parker● AVR expert
● Hardware System
● Client Contact
● Khalid Alotaibi● Hardware System
● Portfolio
● Bruno Loza● RTDS
● Wiki Page
● Budget
● Dr. Feng Li● Lead Instructor
● Dr. Brian Johnson● Technical Advisor
● Nikhil Pai● Primary Client Contact
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Problem Statement
● Design a black start field exciter system for the 15-kVA synchronous generator in the Buchanan Engineering Lab (BEL) to be used for research on black start conditions
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Black-Start
● Definition
● The process of restoring a power station to operation without relying on the external electric power transmission network.
● Primary applications
● Hydropower
● Diesel generators
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Exciting a Synchronous Generator for a Black Start
1. The rotor is spun by an easily started mechanical prime mover like a hydro turbine or diesel engine.
2. DC current is applied to the rotor windings producing a rotating magnetic field.
3. A 3-phase AC voltage is induced on the stator windings.
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Project Goal
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Starting Requirements
● Correct frequency
● Generator cannot be excited until rotor is spinning at rated frequency
● Attempting to excite machine with a stationary rotor would saturate the machine core
● Soft Start
● Needed to reduce the magnitude of the inrush currents to the synchronous generator field windings
●Power electronic control
●Added series resistance
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Black Start System Schematic
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System Process:● 1- Selector switch => System On
Connects battery to AUX power supply on AVR control system
● 2-Prime mover spins rotor to initiate a black start
● 3- Press flash field button
Turns on relay connecting batteries to field windings of the generator
● 4- AVR ramps up field current using machine output power
● 5- Release flash field button
Disconnects Batteries from generator field windings
● 6- AVR controls excitation in steady state operation
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Final System Hardware
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Final System Hardware
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System Test Video
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AVR Recorded Experimental Data
Machine frequency (Hz)
Relative field current (%)
Field voltage (V)
Relative machine output voltage (%)
PWM (%)
Reaches steady state operation in 11 seconds
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RTDS (Real Time Digital Simulation)
● RTDS is used for hardware-in-the-loop simulation of power systems and controls
● RTDS System Components
●Synchronous Machine Model
●AVR Model from ABB
●Variable Load
●Black-start Transfer Switch
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RTDS – Battery bank and AVR
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No Excitation to System
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Excitation from Battery
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Switch from Battery to AVR excitation
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Steady State Operation
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Thank you
●Dr. Herbert Hess
●Andy Miles
●Mike West
●Greg Klemesrud
●John Jacksha
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Questions?