HANDLING OF SHORT CIRCUIT SITUATION IN CONVERTERS

摘要

The invention relates to a method of operating an electronic valve in a converter, in particular a high power converter, wherein the valve comprises an electrically insulated control electrode and wherein the method comprises the steps: - an operating state of the converter and/or of the valve is/are monitored while the valve is open (e.g. resulting in logic time-dependent signals "High di/dt" and "Short circuit"), - if the operating state fulfils a first pre-defined criterion (indicated by "Short circuit = 1"), indicating that there is a short circuit which affects a current through the valve (18), a first process of de-charging the control electrode (G) is performed in order to close the valve (18) (the process starts after the right vertical dashed line), - if the operating state fulfils a second pre-defined criterion (indicated by "High di/dt = 1"), indicating that there may be a short circuit which affects a current through the valve (18), a second process of de-charging the control electrode (G) is per-formed before the first criterion is fulfilled or is performed before the first process is started (the process starts with the left vertical dashed line).