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SUBMITED TO: SUBMITTED BY:
Mr. P.K.GANGULY MAHESH CHAND
(Seminar Coordinator) 10ESEEE047
Introduction of Power system stability
Classification of stability
Micro Grid
Interconnection of micro grid
Conclusion
Defination-
Power system stability is an ability of an electric power system for
a given initial operating condition ,To ...
Classification is based on the following considerations:
 physical nature of the resulting instability
 size of the dist...
Ability to regain normal and stable operation after
being subjected to gradual or slow change in the load.
Concerned wit...
Ability to regain normal and stable operation after
being subjected to sudden & large changes in the load.
Losses-genera...
Same as steady state stability
Included action of turbine governers and voltage
regulators.
Study time is 4-10 sec
Power System Stability
Frequency
Stability
Small-Signal
Stability
Transient
Stability
Short term Long term
Voltage
Stabili...
 Ability of interconnected synchronous machines to remain
in synchronism after being subjected to a disturbance.
 Depend...
 Transient stability of a synchronous machine is an ability to
remain in synchronism after being subjected to sudden or
l...
 Stability is the ability of a power system to maintain
synchronism under small disturbances in rotor angle.
Linearizati...
 Frequency stability is an ability to return stable or normal
operation at rated frequency after being subjected to
imbal...
 Ability of power system to maintain steady state voltages at
all buses in the system after being subjected to a
disturba...
Short term voltage stability-
 involves dynamics of fast acting load component.
 study period of interest is in the orde...
 Power supply for small
community.
 Power is generated by
renewable sources.
 Generation for local load
 Transmission ...
Reasons for connecting a micro grid to a main grid:
Availability
Operations/stability
Economics
 Micro grids are typic...
By Switchgear By Static Switch
 It is the costlier option but it is also the most flexible one.
 Both real and reactive power flow can be controlled.
 Power system is always required normal and stable
operation at rated operating condition & it’s also required
improvemen...
PPT ON POWER SYSTEM STABILITY
PPT ON POWER SYSTEM STABILITY
PPT ON POWER SYSTEM STABILITY
PPT ON POWER SYSTEM STABILITY
PPT ON POWER SYSTEM STABILITY
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PPT ON POWER SYSTEM STABILITY

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ppt on power system stability & micro grid

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PPT ON POWER SYSTEM STABILITY

  1. 1. SUBMITED TO: SUBMITTED BY: Mr. P.K.GANGULY MAHESH CHAND (Seminar Coordinator) 10ESEEE047
  2. 2. Introduction of Power system stability Classification of stability Micro Grid Interconnection of micro grid Conclusion
  3. 3. Defination- Power system stability is an ability of an electric power system for a given initial operating condition ,To regain a state of operating equilibrium after being subjected to a physical disturbance with all system variables are bounded so that practically the entire system remain intact. Stability is a condition of equilibrium between opposing forces instability results when a disturbance leads to a sustained imbalance between the opposing forces.
  4. 4. Classification is based on the following considerations:  physical nature of the resulting instability  size of the disturbance considered  processes, and the time span involved
  5. 5. Ability to regain normal and stable operation after being subjected to gradual or slow change in the load. Concerned with upper loading of machine before losing synchronism. Load is assume to be applied at a rate which is slow. System is Analysis by the set of linear equation. Action of Voltage regulators and turbine governers are not included.
  6. 6. Ability to regain normal and stable operation after being subjected to sudden & large changes in the load. Losses-generator excitation,transmission,switching operations and faults. Linearization of system equation is not permitted. Studied on the basis of swing.  Action of Voltage regulators and turbine governer are not included.
  7. 7. Same as steady state stability Included action of turbine governers and voltage regulators. Study time is 4-10 sec
  8. 8. Power System Stability Frequency Stability Small-Signal Stability Transient Stability Short term Long term Voltage Stability Rotor Angle Stability
  9. 9.  Ability of interconnected synchronous machines to remain in synchronism after being subjected to a disturbance.  Depends on the ability to restore equilibrium between electromagnetic torque and mechanical torque of each synchronous generators.  output power of synchronous machines vary as their rotor angle swing.  System is Instable by increasing angular swings of some generators leading to loss of synchronism with other generators
  10. 10.  Transient stability of a synchronous machine is an ability to remain in synchronism after being subjected to sudden or large changes in rotor angle.  It’s depend on transient disturbance due to-  nonlinear power-angle relationship  The system is designed in such a way that operated so as to be stable for a selected set of transmission faults: L-G, L- L-G, three phases.
  11. 11.  Stability is the ability of a power system to maintain synchronism under small disturbances in rotor angle. Linearization of system equations is permissible for analysis  Instability that may result can be two forms:  due to lack of sufficient synchronizing torque  due to lack of sufficient damping torque
  12. 12.  Frequency stability is an ability to return stable or normal operation at rated frequency after being subjected to imbalance between generation or load.  Instability is occurs due to sustained frequency swings leading to tripping of generating units or loads  In a small system, frequency stability could be of concern for any disturbance causing a significant loss of load or generation  frequency stability problem are associated with equipment responses, poor coordination of control and protection systems.
  13. 13.  Ability of power system to maintain steady state voltages at all buses in the system after being subjected to a disturbance.  voltage instability due to-  A disturbance  increase in load demand  change in system condition causes a progressive and uncontrollable fall or rise in voltage of buses.  Reactive power and voltage control actions are not proper.  Voltage stability is improved by using tap changing transformers, booster transformer , series & shunt capacitor, synchronous phase modifiers
  14. 14. Short term voltage stability-  involves dynamics of fast acting load component.  study period of interest is in the order of several seconds  faults/short-circuits near loads could be important. Long term voltage stability-  Involve Slower acting equipment .  Study period in minutes.
  15. 15.  Power supply for small community.  Power is generated by renewable sources.  Generation for local load  Transmission with less Losses  Usually using solar and wind sources  Smart control
  16. 16. Reasons for connecting a micro grid to a main grid: Availability Operations/stability Economics  Micro grids are typically planned with extra capacity with respect to the local load. This extra power capacity can be injected back into the grid in order to obtain some economic benefit  Grid interconnection allows to reduce fuel operational costs by using the grid when electricity costs are low.
  17. 17. By Switchgear By Static Switch
  18. 18.  It is the costlier option but it is also the most flexible one.  Both real and reactive power flow can be controlled.
  19. 19.  Power system is always required normal and stable operation at rated operating condition & it’s also required improvement of stability .  Stability of power system is improved by using shunt & series capacitors, governing system and Facts controllers.  Micro grid is satisfied local load areas.  Reduce transmission losses.  Power is generated by renewable energy sources and ceate a power park.

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