Consider a System consisting of working at a lagging power factor, a Synchronous motor working at an over-excited condition, and a direct grid connected to the connected to induction generator. Consider capacitive VAr to be a sink of reactive power. Which of the following statement is true?
In the given system, working at a lagging power factor means that the load is consuming reactive power.
The synchronous motor working at an over-excited condition means that it is generating reactive power and acting as a source of reactive power. .
The direct grid connection does not consume or generate any reactive power.
The induction generator is connected to the grid, which means that its output must match the grid frequency and voltage.
If the induction generator is generating excess reactive power, it cannot be fed back into the grid. Instead, it must be absorbed by some other device in the system.
Since the load is consuming reactive power and the synchronous motor is generating reactive power, we can conclude that the synchronous motor is a source of reactive power, while the load is a sink of reactive power.
The induction generator must therefore be absorbing the excess reactive power generated by the synchronous motor, making it a sink of reactive power.
Therefore, the correct statement is:
The synchronous motor is a source of reactive power, and the synchronous generator and the induction generator are sinks of reactive power.