Phase Shifting Transformer for VFD
Voltage stability
Prevent overloads
Control power flow
Phase angle adjustment
What is Phase Shifting Transformer?
A phase shifting transformer is a specialized transformer designed to control the flow of active power in electrical transmission systems by adjusting the phase angle difference between the input and output voltages.
What is VFD?
A variable frequency drive (VFD) is an electronic device used to control the speed and torque of an alternating current (AC) electric motor by varying the frequency and voltage of its power supply.
Main Functions
Power flow management: By dynamically altering the phase angle, it mitigates grid congestion, balances loads, and enhances stability without requiring new infrastructure.
Construction and Operation
Winding Configuration
- Adjusts the overall phase angle.
- Typically use a combination of shunt and series transformers.
- Supplies a voltage injected in quadrature (90° phase shift) into the line via the series transformer.
Tap Changers
- Mechanically controlled on-load tap changers (OLTCs).
- Adjusts the magnitude and polarity of the injected voltage.
- Enables discrete phase shifts.
- Advanced designs may use power electronics for continuous control.
Applications
Grid Congestion Relief
Redirects power from overloaded lines to underutilized ones.
Stability Enhancement
Improves transient stability and dampens oscillations.
Interconnected Systems
Facilitates power exchange between asynchronous grids or HVDC links.
Advantages
- Non-invasive solution for power flow control.
- Reduces reliance on new transmission infrastructure.
- Enhances grid reliability and efficiency.
Limitations
- High cost and physical footprint.
- Mechanical Phase Shifting Transformers have a slower response compared to electronic FACTS devices.
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