What is a load commutated inverter?

Load Commutated Inverter (LCI) is a system with an input thyristor bridge and an output thyristor bridge. The output bridge operates at low speed by turning on a set of 2 thyristors to pass the DC current into the generator’s stator to cause it to rotate.

How does an LCI work?

The LCI operation is simple and reliable. It uses load-commutated, phase-controlled power thyristor technology to supply power to the stator windings of a high efficiency synchronous motor. The LCI controls the motor torque to regulate motor speed. Motor torque is controlled through the DC link current.

What is commutated inverter in power electronics?

Line-commutated inverter: An inverter that is tied to a power grid or line. The commutation of power (conversion from DC to AC) is controlled by the power line, so that, if there is a failure in the power grid, the Photovoltaic system cannot feed power into the line.

What is self commutated inverter?

A self-commutated inverter is one in which the means of commutation is included within the inverter itself. This is the case for circuits including electronic power switches with turn-off capability. Thus, a bipolar transistor, GTO thyristor, or power FET inverter is self-commutated.

What is voltage fed inverter?

A voltage source inverter is fed by a stiff DC voltage or constant DC voltage is called Voltage Source Inverter (VSI) or Voltage Fed Inverter (VFI). In Voltage Source Inverter (VSI) we use power semiconductor switching devices in the circuit like Power BJT, Power MOSFET, IGBT having self-commutation properties.

What are the line commutated inverters how they are operate?

The line commutated converter (LCC) is matured technology which is used for power conversion. The LCC is tied to a grid in which commutation of power devices (SCR) is achieved by grid voltage. In this paper, three phase LCC in an inverter mode is proposed for interfacing of solar photovoltaic (PV) array and ac grid.

Which commutation technique is commonly employed in series inverters?

Load commuation
___________ commutation technique is commonly employed in series inverters. Solution: Load commuation is used in inverter in which L and C are connected in series with the load or C in parallel with the load such that overall load circuit is under damped.

What are the advantages of current commutated chopper?

The capacitor always remains charged with the correct polarity. Commutation is reliable as load current is less than the peak commutation current ICP. The auxiliary thyristor TA is naturally commutated as its current passes through zero value.

What is the principle of self commutation?