The real power is adujusted with the speed governor and the reactive power can be adjusted by varying the voltage of the alternator. Kindly check if the exhisting voltage regulator has quadrature droop control facility inbuilt. If it does not have replace the voltage regulators with the ones...
Hi Azril,
When a reverse power is applied to the turbine, the turbine's alternator will not become a motor as the phase angles of both sources may not be the same at that time. In that case heavy circulating current will damage the windins of the turbine's alternator.
Hardeep
Hi Azril,
A reverse power from other source can cause windings failure in the alternator if there is no safty device i.e. reverse power trip relay.
Regards,
Hardeep