CONTROLLER OF VOLTAGE TYPE INVERTER

PURPOSE:To stably start by detecting the attenuation of an AC input current corresponding to the rise of a DC voltage at the start of a motor at the starting time to rise the output frequency. CONSTITUTION:A current variation detector 18 for detecting the variation in the reduction of a starting cur...

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Bibliographische Detailangaben
1. Verfasser:	TAKAHASHI TAKEMI
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROL OR REGULATION THEREOF CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PURPOSE:To stably start by detecting the attenuation of an AC input current corresponding to the rise of a DC voltage at the start of a motor at the starting time to rise the output frequency. CONSTITUTION:A current variation detector 18 for detecting the variation in the reduction of a starting current by differentiating an input AC current detection value from a rectifier 8 to output an acceleration signal for controlling the DC voltage of a power reactor 1 in a switch circuit 17 at the reduction varying time, and means for performing the increase in the frequency command signal of a frequency control system by applying an acceleration signal to the switch circuit are provided. Thus, the rise of a DC current due to the regenerative energy based on the abrupt variation in the starting current can be suppressed.