Equivalent AC-DC-AC matrix high voltage frequency converter control method based on space vector modulation

• Main Authors: LIU DONGLIANG, GAO SHENYING, ZHANG YAO, CUI YANFEI, ZHENG XIEHUI
• Format: Patent
• Language: Chinese; English
• Published: 04.04.2012
• Subjects: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The invention discloses an equivalent AC (Alternating Current)-DC (Direct current)-AC matrix high voltage frequency converter control method based on space vector modulation. The traditional variable frequency speed control cannot realize bidirectional flow of electrical energy, is not suitable for four-quadrant operation of a motor, fails to regulate input power factor and to achieve transmission performance preferably, and needs to improve power saving efficiency. The method of the invention comprises the following steps of: determining a duty ratio of a rectifier part and the duty ratio ofan inverter part, determining the duty ratio of a fictitious indirect way and finally determining a control pulse signal to drive a switching tube. By adopting above ways to obtain the control pulse signal to drive each switch element, three-phase AC input voltage can be converted into three-phase AC output voltage with the needed frequency and amplitude. The method of the invention has good transmission property, high ef