Is the injection transformer an energy storage device

What is an injection transformer & how does it work?

The purpose of the injection transformer is to connect the DVR to the distribution system through the HV windings and couples the injected voltage generated by voltage source inverter (VSI) to the incoming supply voltage after the detection of any voltage sag by the control circuit.

What is series injection transformer?

These transformers are also known as booster transformers or series injection transformer because they are used to inject the restoring voltage in the line if voltage sag occurs in a system due to a fault. The other part of the power circuit is the MOSFET Inverter circuit.

What is voltage injection from DVR?

In the basic topology, voltage injection from DVR is to compensate the voltage sag and swell which needs a high-capacity DC storage system and it is supported by the supercapacitor, flywheels, batteries, and superconducting magnetic energy storage (SMES) for power quality improvement in the electrical distribution system.

Why is injected transformer rating important?

The injection transformer rating is an important factor when deciding the DVR performance, since it limits the maximum compensation potential of the DVR (Li et al. 2000); if the transformer is underrated, the injected voltage may saturate the transformer and result in improper operation of the DVR.

What is a transformer-less DVR?

The transformer-less DVR has been also reported for voltage compensation. This method gets rid of the injection transformer used in the basic configuration of DVR. The major functions of the injection transformer include voltage injection and electrical isolation.

What are the different types of energy storage units?

Many instruments such lead acid batteries, SMES and super capacitors etc. are used as energy storage units. The energy storage element (external battery) is used to inject the required voltage for restoration through the injection transformer into the system.