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RBF Neural Network
Approach For
Security Assessment And
Enhancement
Yesuratnam Guduri Professor, Dept. of Electrical Engg.
University College of Engineering
Osmania University, Hyderabad, India
1
Points to be Addressed • Security Assessment
Static Security Assessment o Static Security Index
Transient Security Assessment o Transient Security Index
• Security Enhancement Static Security Enhancement
o Generation Rescheduling
Transient Security Enhancement o Fast Valving
• RBFNN Approach • Case Studies • Results and Discussion
2
Static Security Index
(SSI) Class/ Level of Static Security
SSI = 0 Class A : Secure
SSI > 0 & SSI < = 5 Class B : Critically Secure
SSI > 5 & SSI < = 15 Class C : Insecure
SSI > 15 Class D : Highly Insecure
3
STATIC SECURITY ASSESSMENT Ability of a power system to reach a steady state
operating point without violating the system operating
constraints following a contingency
TRANSIENT SECURITY
ASSESSMENT Following the occurrence of a large
disturbance, the system oscillations, if
proceed in opposite directions, will cause
loss of synchronism among generators.
4
Angle Stability Transient Security
Index (TSI)
Stable 1
Unstable 0
RBFNN APPROACH
5
Power System Operating
state as observed at a
control centre
Static Security Assessment
Transient Security Assessment
INSECURE
Security
Enhancement
Using
Generation
Rescheduling
SECURE
INSECURE Security
Enhancement
using
Fast Valving
Input Features For SSA INPUTS IEEE 14 BUS IEEE 39 BUS
Load bus voltages 9 29
Load bus angles 9 29
Line MVA Flows 20 46
6
Input Features For TSA INPUTS 14 BUS
Mechanical power input of generator 5
Voltage behind transient reactance 5
Relative rotor angles at instant of fault application 4
Relative rotor angles at instant of fault clearance 4
Generation Rescheduling –
Static Security Enhancement CCV - Amount of generation to be changed at
each generator in order to relieve the
overload
Fast Valving-
Transient Security Enhancement
CCV - Amount of decrease in the mechanical
power required at each generator to
make the system stable for every fault.
7
Results of
Static Security Assessment IEEE 14 bus IEEE 39 bus
Operating scenarios 60 133
Static secure cases 47 22 Static critically
secure cases 10 103
Static insecure 3 8
Training samples 50 110
Testing samples 10 23
8
Security Enhancement
using Generation Rescheduling
IEEE 39 bus
system
Total number of samples 111
Training samples 90
Testing samples 21
Corrective Control Vectors 13
9
Results of Transient Security
Assessment
IEEE 14 bus system
Operating scenarios 75
Transient secure 36
Transient insecure 39
Training samples 65
Testing samples 10
10
Security Enhancement using
Fast Valving
IEEE 14 bus system
Total number of samples 39
Training samples 33
Testing samples 6
Corrective control vectors 4
11
CONCLUSIONS
Simpler network configurations
Faster training procedures
Suitable for on-line evaluation.
Bring the insecure state to secure
state
12