| 摘要 |
PURPOSE:To construct a control system having good followup property by calculating the value of a circulating current to be flowed through a cycloconverter from a phase control signal and the detected value of a load current. CONSTITUTION:V u, V v, V w are inputted from the phase control input signal (K2 output terminal) of a cycloconverter, the sinusoidal values sin alphau, sin alphav, sin alphaw of the firing control angle of the respective phase converters are calculated, a circulating current distribution coefficient KU=(LM-¦ILU¦)/IM, KV=(IM- ¦ILV¦)/IM, KW=(IM-¦ILW¦)/IM are obtained from the absolute value ¦ILU¦, ¦ILV¦, ¦ILW¦ of 3-phase load current and normalizing constant IM, and the instruction values of the circulating currents of the respective phases are applied as IOU*(=IOV*=IOW*)=KU(Icap*¦ILU¦sin U- ¦ILV¦sin V-¦ILW¦sin W)/2KU sin U +KVsinV+KW sin W), where the set reactive current value of the energized terminal is represented by Icap*. |
