What is reactive power in power system?
In electrical grid systems, reactive power is the power that flows back from a destination toward the grid in an alternating current scenario. Reactive power gets energy moving back into the grid during the passive phases. Reactive power is also known as: phantom power.
What are the sources of reactive power in power system?
Dynamic Reactive Power Sources: Some of the dynamic sources which acts as sources to the reactive power are: Synchronous generators. Synchronous condensers. Solid state devices such as FACT devices (STATCOM, SVC)
What is the direction of reactive power?
Reactive power flows from high voltage side to low voltage side..
How do you compensate reactive power?
Shunt Reactive Power Compensation It can be capacitive (leading) or inductive (lagging) reactive power, although in most cases compensation is capacitive. The most common form of leading reactive power compensation is by connecting shunt capacitors to the line.
How do you control reactive power in a power system?
Industrial consumers are normally charged for reactive as well as active power; this gives them an incentive to improve the load power factor by using shunt capacitors. Compensating devices are usually added to supply or absorb reactive power and thereby control the reactive power balance in a desired manner.
How do you compensate reactive power locally?
A Cos Phi compensation bank or capacitor bank can be used to compensate for the inductive reactive power and optimize the power factor. The Cos Phi capacitor bank provides the power required for inductive loads.
Why is reactive power needed?
Why Do We Need Reactive Power? Reactive power (VARS) is required to maintain the voltage to deliver active power (watts) through transmission lines. Motor loads and other loads require reactive power to convert the flow of electrons into useful work.
What is reactive power in simple terms?
The portion of electricity that establishes and sustains the electric and magnetic fields of alternating-current equipment. Reactive power is provided by generators, synchronous condensers, or electrostatic equipment such as capacitors and directly influences electric system voltage. …
What is lagging reactive power?
A lagging power factor signifies that the load is inductive, as the load will “consume” reactive power. The reactive component is positive as reactive power travels through the circuit and is “consumed” by the inductive load.
Will the reactive power of the load be positive or negative?
The amount of reactive power present in an AC circuit will depend upon the phase shift or phase angle between the voltage and the current and just like active power, reactive power is positive when it is “supplied” and negative when it is “consumed”.
What is reactive power and what is the need to compensate reactive power?
Reactive power compensation is one of the well-recognized methods for its contribution to the reduction of energy losses, along with other benefits; Such as power factor correction, increase of the transport and operation capacity of lines and devices of the grid, voltage stability and improvement of the voltage …
What is re-reactive power?
Reactive power is the resultant power in watts of an AC circuit when the current waveform is out of phase with the waveform of the voltage, usually by 90 degrees if the load is purely reactive, and is the result of either capacitive or inductive loads.
What is reactive energy and how does it flow?
As the pendulum swings back down reactive power is moving back into the grid to be absorbed. In these types of definitions, experts would say that reactive energy is energy circulating back and forth between the source and the load, specifically, that reactive power “fades” back toward a source.
What is the effect of reactive power on system power factor?
This implies that all those installations need to be designed for the apparent power which considers both active and reactive power. If the reactive power exists in excess amounts, it will greatly reduce the system power factor and hence lowers the operational efficiency.
What is the difference between reactive and actual work done?
Actual work is done only when current is in phase with voltage, such as in resistive loads. An example is powering an incandescent light bulb; in a reactive load energy flows toward the load half the time, whereas in the other half power flows from it, which gives the illusion that the load is not dissipating or consuming power.