What is reactive power control?
“To make transmission networks operate within desired voltage limits and methods of making up or taking away reactive power is called reactive-power control”.
What are the methods of controlling reactive power?
(a) Sources or sinks of reactive power, such as shunt capacitors, shunt reactors, synchronous condensers, and static var compensators (SVCs). (b) Line reactance compensators, such as series capacitors. (C) Regulating transformers, such as tap-changing transformers and boosters.
What is reactive power formula?
Reactive power: Q = V x Ir (kvar)
Where is reactive power used?
Reactive power is used by most types of electrical equipment that uses a magnetic field, such as motors, generators and transformers. It is also required to supply the reactive losses on overhead power transmission lines.
What is the advantage of reactive power?
Reactive power is used to provide the voltage levels necessary for active power to do useful work. Reactive power is essential to move active power through the transmission and distribution system to the customer.
How does reactive power regulate voltage?
When reactive power supply lower voltage, as voltage drops current must increase to maintain power supplied, causing system to consume more reactive power and the voltage drops further . If the current increase too much, transmission lines go off line, overloading other lines and potentially causing cascading failures.
What is difference between series and shunt compensation?
The shunt capacitor does it by changing the power factor of the load, whereas the series capacitor does it by directly offsetting the inductive reactance of the circuit to which it is applied.
What causes reactive power?
Positive reactive power is caused by inductive loads such as motors and transformers (especially at low loads). Negative reactive power is caused by capacitive loads. This can include lighting ballasts, variable speed drives for motors, computer equipment, and inverters (especially when idle).
What is reactive power in AC operation?
Reactive Power in AC Circuits Reactive power (Q), (sometimes called wattless power) is the power consumed in an AC circuit that does not perform any useful work but has a big effect on the phase shift between the voltage and current waveforms.
What is the unit of real power?
watt
The unit for all forms of power is the watt (symbol: W). However, this unit is generally reserved for the real power component.
Why is reactive power used?