Synchronous Generator (Alternator) Stator Voltage Control

#1

Hi everyone,

I’m trying to use PSIM to model an Automatic Speed/Voltage Regulator (Control) for an Engine Generator and experimenting with basic topologies.

I have several questions regarding my workflow (which i don’t know if it’s right). My topology consists of :

  • a DC motor replacing the thermal engine
  • a DC/DC Buck converter to provide the variable DC source for speed adjustements
  • a 3-phase Synchronous generator (excitation system for the main alternator)
  • a 3-phase Controlled Rectifier to provide the variable field which is fed to the “rotor” of the main Alternator
  • a 3-phase Alternator

My questions are :
2) how to achieve whithin PSIM a smooth start to achieve to achieve synchronisation ?

  1. is it possible to control the terminal alternator voltages by comparing the measured voltages and a reference and adjusting the controlled rectifier thyristors firing angle ?
  2. How to correctly size each-motor of the motor-drive chain ?

Thanks

#2

Hi Aris,

There are some generator based example simulations in the wind power systems folder, these would be a good place for you to start in your simulations to show how to do the startup

With regards to the thyrsitor control there are some thyrsitor based example circuits in the ac-dc folder, in general any circuit with thyristors will have “thy” in the title to make it easy to search for.

correctly sizing things is something that you need to determine!

#3

The structure of the brushless AC synchronous generator is divided into two parts, a stationary part and a rotating part. The stationary part is called a stator, and includes a base, a stator core, a stator winding, an end cover, a bearing cover, and a stator of an AC exciter.

Stator

It consists of a base, a stator core and a stator winding. The stator core and the stator winding are part of the induced potential and current, which is also called the armature.

  1. Base: The overall support of the generator, used to fix the armature and the front and rear end caps together to support the rotor. There are generally outlet boxes on the base, located on the upper part of the base, and only on the right side (from the extended end of the shaft). A wiring board is installed in the outlet box to draw an alternating current or the like.

  2. Stator core: part of the stator iron core generator magnetic circuit. In order to reduce the eddy current loss, the core is formed by laminating silicon steel sheets coated with insulating varnish on both sides. The core is provided with a uniform stepped slot to embed the discharge pivot winding.

  3. Stator winding: consists of coil windings, which are connected in a certain way and embedded in the core slot. The three-phase windings should be placed symmetrically and shy at 1200 electrical angles to each other.