Download Design & Implementation of Variable Speed Induction Generator

Condition Monitoring
Design & Implementation of Variable
Speed Induction Generator Systems for
Fault Studies in Wind Energy Applications
Background:
• Wind Energy Systems have received renewed interest in the past decade,
• A need exists for the reduction of operational and maintenance costs of these
systems
• Continuous condition monitoring of these generators allows for early detection of
degeneration and proactive responses, minimizing downtime & maximizing
productivity
Project Aims:
• Design, model and implement two variable speed induction
•
generator systems
• Implement the more common faults on the generators
• Attempt to identify them using steady state fault detection
•
techniques
• Develop a platform for further research into the evaluation
of fault detection techniques suitable for transient operation
of the induction generator
Condition Monitoring
Stator Phase C
Winding
Stator Phase A
Winding
Converter II
Stator Phase B
Winding
Logarithmic Power Spectral Density for operation at 1120rpm
60
60
40
Healthy
20
0
50
60
70
80
90
100
110
120
130
140
150
280ohm
124.7Hz
40
Fault 1
20
0
50
Inter-Turn Fault
Magnitude (dB)
Wind
Turbine
Variable speed wind energy conversion systemusing a doubly-fed induction generator
Simulation of an
inter-turn fault
Steady state operation
Gear
Box
Healthy Machine
DFIG
Inter-Turn Fault
Transformer
Converter I
Variable
Resistor
60
70
80
90
100
60
110
120
130
140
150
180ohm
124.7Hz
40
Fault 2
20
0
50
60
70
80
90
100
110
Frequency (Hz)
120
130
140
150
Fault harmonics are identifiable during steady state
Transient operation
Logarithmic Pow er Spectral Density for operation through synchronous speed
Healthy
Machine
80
40
20
Inter-Turn Fault
80
Inter-Turn Fault
Magnitude (dB)
0
100
Experimental setup of a variable speed wind energy
conversion system using a doubly-fed induction
generator
Healthy
60
80
110
120
130
140
150
160
170
180
190
200
280ohm
Fault 1
60
40
20
0
100
110
120
130
140
150
160
170
180
190
200
180ohm
60
Fault 2
40
20
0
100
110
120
130
140
150
160
Frequency (Hz)
170
180
190
200
Fault harmonics not identifiable during transient