Non-dead-zone half-cycle modulation method based on SOGI-FLL

• Main Authors: ZHAO RENDE, ZHAO BIN, HE JINKUI, YAN QINGZENG, JIANG XIANQIANG, LI GUANGCHEN
• Format: Patent
• Language: Chinese; English
• Published: 12.06.2018
• Subjects: 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 THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses a non-dead-zone half-cycle modulation method based on SOGI-FLL. The method comprises steps of acquiring a current signal of a converter through sensor detection; filtering thecurrent signal of the converter through a SOGI-FLL module to obtain a fundamental wave current signal and a quadrature signal of a certain frequency; in a half-cycle modulation module, comparing a voltage modulation signal and a carrier signal a to obtain an initial drive signal; according to the initial drive signal obtained according to the polarity distribution of the fundamental wave current signal, obtaining a non-dead-zone half-cycle driving signal that can be alternately enabled with the polarity of the fundamental wave current signal; and achieving the non-dead-zone half-cycle modulation by controlling the converter with the non-dead-zone half-cycle drive signal. The advantages of the method are that: it can be flexibly embedded into the closed-loop control system of the converter,the polarity of the curre