Conduction through sensing and inverter protection system

Details Conduction through sensing and inverter protection system Conduction through sensing and inverter protection system

H - Electricity

02

M

321/51

H02M 7/525 (2006.01) H02M 7/515 (2006.01)

Patent

CA 1099339

Case 2568 ABSTRACT OF THE DISCLOSURE A control or protection system for a line commu- tated inverter detects mode 2 conduction-through faults and initiates a control sequence for recovery without shutting down the inverter. A conduction sensor in each leg provides a signal representing conduction and this is compared with a signal representing the forbidden interval when conduction should not occur in that leg. When conduction is detected in a forbidden interval it normally indicates a mode 2 conduction- through fault and the gating pulses are advanced for at least the next two pulses to occur immediately but with a limit of 60°. This causes commutation of the legs which are carrying the conduction-through fault current provided that sufficient volt-seconds remain in the AC part of the circuitry.

301105

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