Why does a generator have a limit for reactive power output?

The minimum reactive power capability corresponds to the maximum reactive power the generator may absorb when operating with a leading power factor. These limitations are a function of the real power output of the generator, that is, as the real power increases, the reactive power limitations move closer to zero.

When the generator bus is treated as load bus?

The generator bus is treated as a load bus if it violates the specified limits. The previous iteration value of the bus is used to calculate the current iteration value, as the bus’s reactive power is compared to the limit it has violated. There were 14.

What is capability curve of a generator?

Capability Curve of Generator defines the boundaries within which it can deliver reactive power continuously without overheating. Generator rating is specified in terms of MVA and power factor at a particular terminal voltage.

What parameters have an immediate impact on the generator voltage?

Two key factors affect the magnitude of voltage induced. The speed at which the conductor moves through the fixed magnetic field and the strength of the magnetic field determine the output voltage.

What limits the maximum reactive power in leading current mode?

Limits on reactive power capability are dependent on stator winding rating, field current rating, terminal voltage rating, and the active power output of the machine.

Why is the generator bus called as voltage controlled bus?

Voltage Controlled Buses : These are the buses where generators are connected. Therefore the power generation in such buses is controlled through a prime mover while the terminal voltage is controlled through the generator excitation.

What is the value of reactive power and bus voltage when generator bus is treated as load bus?

If the reactive power of a generator bus violates the specified limits, then the generator bus is treated as load bus. The reactive power of that particular bus is equated to the limit it has violated and the previous iteration value of bus voltage is used for calculating current iteration value.

What are the factors which limit the generator capability curve?

1 Typical Capability Curve The reactive power output of a synchronous generator is constrained by several factors: armature current limit, field current limit, and end region heating limit [1]. Each of these limits are modeled as circles in the active-reactive power output plane.

Why exciter is used in generator?

The main purpose of exciter in a generator(alternator) is to provide stationary rotating magnetic field. Which is used to induce the e.m.f in the armature coil. So, DC power is given to exciter and the exciter is nothing but a coil, and the exciter creates a magnetic field.

What is the difference between real and reactive power?

Active power is the power that continuously flows from source to load in an electric circuit. Reactive power is the power that continuously flows from source to load and returns back to source in an electric circuit. Active power is called as ‘Real power’ or ‘Watt full power’ or ‘True power’or Actual power.