Types of VFD
The VFD is of two types based on its topologies
- Voltage Source Inverter (VSI)
- Current Source Inverter (CSI)
Voltage Source Inverter (VSI)
A voltage source inverter is a device that converts DC to AC voltage. The voltage source inverter maintains a constant DC voltage at the input as it also produces AC output of which we can adjust the frequency. Voltage source inverter consists of components like transistors, thyristors, etc.
Applications Of VSI
- Used in Renewable Energy Systems like Solar Farms and Wind Farms, as they convert DC to AC output.
- Used in Electrical Vehicle Drive System as they can be used to control the speed of the vehicle by regulating AC voltage.
- Used in Uninterruptible Power Supplies (UPS) as they generate and regulate flow of AC voltage by which we do not get power outage.
Current Source Inverter (CSI)
A Current Source Inverter is a device that gives us constant current output as we get controllable AC voltage output. CSI takes the DC current from sources like batteries and converts them into three phase or single phase AC current which is controllable. The main work of CSI is to maintain the steady flow of current in the circuit. The components like IGBT, MOSFETS, etc. are used in CSI to regulate the flow of current. We can also control the direction of the current and also the magnitude.
Applications of CSI
- CSI can be used in high power AC drives as they are mostly good for industries.
- We can use CSI in single stage solar inverters like system which require conversion of DC to AC.
Variable Frequency Drive
Variable Frequency Drive (VFD) is the type of AC motor drive that controls the speed and the torque. It can control the speed by changing the frequency of the current. They can also control the speed and torque of the motor by changing the voltage. They are the motors of the modern world. Most industries are now shifting to use VFD as they are easy to use and can be controlled by software. VFDs are not only used in large-scale industries but also used in small-scale industries as well.
Table of Content
- Variable Frequency Drive
- Types
- Components and Operation
- Working
- Advantage
- Disadvantage
- Applcations