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significance of reactive power and its need of compensation


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this presentation is about the significance of the reactive power in the power grid, what are the drawbacks of the low level of the reactive power and what is the need of its compensation.

Published in: Engineering
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significance of reactive power and its need of compensation

  1. 1. Significance of “REACTIVE POWER” and it’s need of compensation Presented by: Shubham D. Sadatkar Roll no. 69 Guide: Co-Guide: Prof. G.K.Andurkar Sir Miss. Dhyanda Kohle Mam
  2. 2. Outline • What is Reactive Power and where does it came from? • Why it is important? • Effects of reactive power. • Why we need to compensate it? • Which are the various devices to control it? • Conclusion
  3. 3. What is reactive power • It describes the background energy movement in an AC system from the production of electric and magnetic field. • It is the combination of continuous forward moving or ‘real’ energy flow, combined with the sloshing or ‘imaginary’ energy flow • It is used for core magnetization of alternators. • It is non consumable only become important when ‘electric loads’ contains coils or capacitor.
  4. 4. Terminology of Reactive power
  5. 5. Why do we need Reactive Power • Reactive power (VARs)is required to maintain the voltage to deliver active power (WATTs) through the grid. “Indexing of Active Power consumption is called reactive power” • Electro-mechanical devices and other loads require reactive power • Reactive power deficiency causes the voltage to sag down
  6. 6. Importance of Reactive power • Has a strong effect on system voltages • It must balance in the grid to prevent voltage problems • Reactive power levels have an effect on voltage collapse. Due to deficiency of reactive power in the grid the blackout occurs.
  7. 7. • The conversion devices phenomena (i.e convert the flow of electrons into useful work)only possible if the reactive power is present • It refers to the circulating power in the grid that does no useful work
  8. 8. Reactive Power and Power Factor • Reactive power is present when the voltage and • current are not in phase *One waveform leads the other *Phase angle not equal to zero degree. *Power factor less than unity • Measured in volt-ampere reactive (VAR) • Produced when the current waveform leads voltage waveform (Leading power factor)
  9. 9. • Vice versa, consumed when the current waveform lags voltage (lagging power factor)
  10. 10. Reactive Power Limitations • Reactive power does not travel very far • Usually necessary to produce it close to the location where it is needed • A supplier/source close to the location of the need is in a much better position to provide reactive power -> versus one that is located far from the location of the need • Reactive power supplies are closely tied to the ability to deliver real or active power
  11. 11. Why the compensations is needed • Due to the two main reasons we need to compensate reactive power It share the space with active power It does not travel very far
  12. 12. How Reactive Power Level Controlled • Regulate to control voltage to a desired nominal value • Often, reactive power injections regulate voltage at the location of the injection • Control effects tend to be localized • Some reactive power supply mechanisms: ->Shunt capacitors (fixed and switchable) ->Synchronous condensers ->Synchronous generators ->Static VAR compensator