THREE-LEVEL BRAKE CHOPPER AND METHOD FOR CONTROLLING THREE-LEVEL BRAKE CHOPPER

A method for controlling a three-level brake chopper and a three-level brake chopper comprising, a first controllable semiconductor switch (T1) connected between a positive direct current pole (dc+) and a first connection point, a second controllable semiconductor switch (T2) connected between the f...

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Bibliographische Detailangaben
1. Verfasser:	Viitanen, Tero
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	A method for controlling a three-level brake chopper and a three-level brake chopper comprising, a first controllable semiconductor switch (T1) connected between a positive direct current pole (dc+) and a first connection point, a second controllable semiconductor switch (T2) connected between the first connection point and a neutral direct current pole (NP), a third controllable semiconductor switch (T3) connected between the neutral direct current pole (NP) and a second connection point, a fourth controllable semiconductor switch (T4) connected between the second connection point and a negative direct current pole (dc-), resistance means (Rbrk) connected between the first connection point and the second connection point, and control means (11) configured to control the second controllable semiconductor switch (T2) and the third controllable semiconductor switch (T3) into a conducting state in response to detecting a fault in the resistance means (Rbrk).