Fast Stability Achievement through Fuzzy Logic Based Non-

Linear Excitation Control of Synchronous Generator

Muhammad Mohsin AmanKHA 100105

University of Malaya Supervisor: Dr. Ghauth Bin Jasmon

PRESENTER:

PAPER TITLE:

What is Stability? Why are we calling “Fast Stability”? How to achieve Stability?

Some Definitions….

MM Aman, GB Jasmon, A Ghufran, MA Nawaz, M Raza. Fast stability achievement through fuzzy logic based non-linear excitation control of synchronous generator. 2011 IEEE Colloquium on Humanities, Science and Engineering (CHUSER), 431-436

Power system MATLAB/Simulink® Model

Total three-phase power: sinXEV

Ps

ft3

The above equation shows that the power produced by a synchronous generator depends on the angle δ between the Vt and Ef. The maximum power that the generator can supply occurs when d=90o.

s

ft

XEV

P3

Exciter controls not only help during transient but a necessary requirement during steady state also. The generator power limits increases due to increase of system voltages.

Steady-State Stability Limit….

MM Aman, GB Jasmon, A Ghufran, MA Nawaz, M Raza. Fast stability achievement through fuzzy logic based non-linear excitation control of synchronous generator. 2011 IEEE Colloquium on Humanities, Science and Engineering (CHUSER), 431-436

Transient Stability….

MM Aman, GB Jasmon, A Ghufran, MA Nawaz, M Raza. Fast stability achievement through fuzzy logic based non-linear excitation control of synchronous generator. 2011 IEEE Colloquium on Humanities, Science and Engineering (CHUSER), 431-436

Power System Stabilizers…..

How to Achieve Stability….??

MM Aman, GB Jasmon, A Ghufran, MA Nawaz, M Raza. Fast stability achievement through fuzzy logic based non-linear excitation control of synchronous generator. 2011 IEEE Colloquium on Humanities, Science and Engineering (CHUSER), 431-436

Speed-Based (Dw) Stabilizer:Frequency-Based (Δf) Stabilizer:Power-Based (ΔP) Stabilizer:Integral-of-Accelerating Power (ΔPω) Stabilizer

Power System Stabilizer….

MM Aman, GB Jasmon, A Ghufran, MA Nawaz, M Raza. Fast stability achievement through fuzzy logic based non-linear excitation control of synchronous generator. 2011 IEEE Colloquium on Humanities, Science and Engineering (CHUSER), 431-436

PI PD PID Fuzzy Logic Controller

Different Types of Controllers….

What is Fuzzy Logic Controller? How to Implement In our System?

Some Definitions….

A knowledge Base System A linguistic approach is used

What is Fuzzy Logic?

Fuzzification Decision De-Fuzzification

What is Fuzzy Logic Controller?

Detailed system of fuzzy controller

Power system MATLAB/Simulink® Model

(a) Open Loop System (b) Closed Loop System

Fuzzy Logic Controller

Our System Model

Power system MATLAB/Simulink® Model

Power system MATLAB/Simulink® Model

Figure: Fuzzy logic controller and input output variables

FLC in Our System……

Input 1: Voltage “error” Input 2: Rate of Change of Voltage Error

Output: Field Current

Membership Functions of FLC

FAM Table

Where:NL= Negative Large PL=Positive LargeNM= Negative Medium PM=Positive MediumNS= Negative Small PS=Positive Small

ZE= Zero

Comparison of load angle

Comparison of active power

Comparison of electromagnetic torque

Simulation and Results

(a) Terminal voltage (Fault duration 0.1 sec)

(b) Terminal voltage (Fault duration 0.15 sec)

(c) Terminal voltage (Fault duration 0.18 sec)

Simulation and Results (cont…)

THANKYOU ALL…!!

With Special Thanks To…..