| Title |
Operation Characteristics When Applying a Double Squirrel Cage Induction Generator with Different Multiples of Locked Rotor Current |
| DOI |
https://doi.org/10.5370/KIEE.2024.73.7.1252 |
| Keywords |
Double squirrel cage; Induction generator; Locked rotor current; Starting current; Voltage drop |
| Abstract |
The induction machine can be operated as an induction motor or induction generator by adjusting the rotor speed before and after the synchronous speed. Induction machines are widely used in industrial sites because they are more advantageous than other rotating machines in terms of convenience of maintenance, robust and economical price. The biggest disadvantage of this induction machine is that the voltage drop is high due to the flow of large current when starting or connecting to the grid. Since the induction generator starts and then connects to the grid near synchronous speed, there is no need to set the value of the locked rotor current high to generate a large torque when starting like an induction motor. When an induction generator generates power and sends it to the grid, it must pass through a motor operating area lower than synchronous speed. This is because the reactive power required for magnetization must be supplied from the grid. At this time, a large voltage drop may occur, mainly in the distribution system.
In this study, we analyzed how the voltage drop, change in power, and power factor vary depending on the size of the current depending on the magnification of rotor locked current when developing a three-phase double squirrel cage induction generator and connecting it to the grid. |