Swing Curve, Inertia Constant of the System & Effect of Grounding
Absolute stability of the system can be checked with the help of swing curve.
Summary
Absolute stability of the system can be checked with the help of swing curve.
Things to Remember
- If δ decreases/constant,system is stable otherwise not.
- If the generators are connected in parallel & swing together,their inertia should be additive in nature.
- δ becomes function of time means power angle becoming rotor angle.
- For steady state stability,power angle should be less than 90 degree.
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Swing Curve, Inertia Constant of the System & Effect of Grounding
Swing Curve:
It is the plot of torque angle δ vs time t, can be obtained by solving the swing equation. It shows the variation of torque angle versus time.Absolute stability of the system can be checked with the help of swing curve.If δ decreases/constant,system is stable otherwise not.
If the rotor angle δ increases indefinitely, then it shows that the system is unstable.
Inertia Constant of the System:If H1,H2 H3…….Hn be the inertia constants of machines with power rating S1,S2,……….S3 respectively . let all these machines are connected in parallel .
Now, HeqSeq = H1S1+ H2S2+ H3S3+…….+ HnSn
Effect of Grounding on stability:- If the fault is Closer to the generator,Acceleration of generator is more.
- If the fault is closr to motor, deacceleration of the motor is more.
- Grounding resistor located near to the generator is beneficial.
- Grounding Reactance at receiving end is better.
- In 3 phase fault, neither resistance grounding nor reactance grounding have any effect in power transfer & hence on the stability of the system.
After disturbance, voltage regains its steady state value is known as voltage stability.
Lesson
Power System Stability
Subject
Electrical Engineering
Grade
Engineering
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