What is leading and lagging reactive power?

Power factors are usually stated as “leading” or “lagging” to show the sign of the phase angle. Capacitive loads are leading (current leads voltage), and inductive loads are lagging (current lags voltage). Electrical loads consuming alternating current power consume both real power and reactive power.

What is leading and lagging VAR?

They are determined by the sign of the phase angle between the current and voltage waveforms. The term ‘leading power factor’ is used where the load current leads the supply voltage, whereas the term ‘lagging power factor’ is used where the load current lags behind the supply voltage.

What is reactive power in alternator?

Reactive power is an imaginary power which is delivered by capacitors and alternators. Consider the case in which the load is a pure capacitance for which Z =(1/ωC) ∠−90◦ . Then, θ= −90◦, and we have. [wp_ad_camp_1] Here again, the average power is zero, and we say that reactive power flows.

How active power and reactive power output from an alternator are controlled?

As known, the active power control is the control of torque produced by the machine and the reactive power control is the control of flux. The stator active and reactive power of doubly-fed wound rotor induction generator is controlled by regulating the current and voltage of the rotor windings.

How do you change alternator reactive power?

If you like to increase the MVAr or reactive power then increase the excitation current in the excitation system. And do decrease to do the reverse. The excitation current to rotor creates magnetic flux. So by controlling the strength of magnetic flux we are controlling the reactive power.

How is alternator reactive power calculated?

I’m tying to calculate the change in reactive power of an alternator with the change in its real power input. P=EV/Xs sin(d) is the real power output of the generator. Q=EV/Xs cos(d) – V^2/Xs is the reactive power output of the generator.

How do you control the active power of the alternator?

We can control it by varying either active or reactive power. To control power factor In a power plant the active and reactive power is adjusted by the prime mover and alternator set. As Power=active power + reactive power. Active power generates by prime mover.

How do you control real power?

Real power: The real power in a power system is being controlled by controlling thedriving torque of the individual turbines of the system.