Can alternator speed improve power generation?
From electromagnetic theory, rotor and stator is closely linked, active and reactive power generator are by the output of the stator, rotor torque decide the size of the active power and rotor winding dc current determines the amount of reactive power. In structure, a generator is identical to an electric motor, which is usually composed of stator, rotor, end cover, and the electric brush. The stator is composed of the machine seat. Stator iron core, wire wrap winding, and other structural parts that are fixed in these parts. The rotor is made up of rotor core, rotor magnet (magnetic coil), slide ring, (also known as brass ring), fan and shaft. The generator and motor are completely reversible, and the rotor is rotated when the voltage is added to the stator winding of the generator and motor. When the rotor of a generator or motor is rotated by an external force, the rotor is rated at synchronous speed, and the stator can generate a voltage and emit electricity. Just because the design has the focus, generator for motor or motor for generators, efficiency are below 70% of the rated, so generally will not replace, only small capacity will choose instead.
You can increase the excitation current, and if it's permanent magnet you can't do it unless you have a stronger magnet.
You say the speed is less than 3,000, the torque of the rotor is not rotating, the motor is taking energy from the grid and keeping it constant, It doesn't provide energy to the grid. Rotor torque, the generator can generate electricity is the fundamental condition, the rotor can rotate, because the rotor torque, such as water can hydraulic generators, wind generators, etc.
As long as the network is connected, the speed of the generator is synchronous with the electromagnetic system, not fast or slow. The amount of power generated is determined by the torque of the rotor. From the physical structure, the stator and rotor of the generator are completely independent and non-interference parts. Generator stator active source, produce inductive electromotive force, current and drag of the rotor, the exporting of alternating current (ac), by a prime mover (oil, gas, air, water, etc.) determines the amount of active power. Reactive power source, winding of generator rotor is direct current (dc) is introduced from the external magnetic field, under the impulsion of drag, outward flow of reactive power alternating current (ac), determined by the input of rotor dc size the size of the reactive power.
The first thing to verify is the synchronous generator, or the asynchronous generator. This synchronous generator, at synchronous speed (1 pair, 3000 RPM, 50Hz) In this case, the asynchronous generator is operating at a lower speed than the synchronous speed. The speed above synchronous speed is in the operating condition of generator
