Overcurrent protection of photovoltaic inverter IGBT

Is there a new active overcurrent protection scheme for IGBT modules?

Abstract —This paper presents a new active overcurrent protection scheme for IGBT modules based on the evaluation of fault current level by measuring the induced voltage across the stray inductance between the Kelvin emitter and power emitter of IGBT modules.

What causes overcurrent protection of IGBT modules?

I. INTRODUCTION The overcurrent protection of IGBT modules is of concern in many industrial applications where IGBT modules are widely used. An overcurrent condition could be caused by either a short circuit or an overload fault, and the current level of both can be different depending on the impedance of the fault current path.

Does gate voltage pattern analyze for short-circuit protection in IGBT inverters?

J. Lee and D. Hyun, “Gate voltage pattern analyze for short-circuit protection in IGBT inverters,” IEEE Power Electronics Specialists Conference, 2007, pp. 1913-1917.

How to control surge voltage in IGBT?

Control the surge voltage by adding a protection circuit (snubber circuit) to the IGBT. Use a film capacitor in the snubber circuit, place it as close as possible to the IGBT in order to bypass high frequency surge currents. Adjust the IGBT drive circuit’s – VGE or RG in order to reduce the di/dt value. (Refer to Chapter 7, “Drive Circuit Design”.)

How are IGBT overcurrent and short-circuit protection implemented?

IGBT overcurrent and short-circuit protection are implemented using a range of methods in the experimental hardware. These are: For the dc bus current sensing circuit, a small filter must be added in order to avoid false tripping, since the dc bus current is discontinuous with potentially high noise content.

What is over current protection mechanism in PV inverter?

As previously discussed, the simultaneous injection of peak active power from PVs and reactive power into the grid for voltage support can trigger the over current protection mechanism in PV inverter. The triggering of over current protection will lead to disconnection of inverter from the grid which is unfavourable during LVRT period.