Grid-connected voltage type rectifier frequency division simulation resistance control method under unbalanced power grid

• Main Authors: XIONG WENJING, LIU TING, LIN JIANHENG, YUAN WEIHAO, SU MEI, LIU YONGLU, SUN YAO
• Format: Patent
• Language: Chinese; English
• Published: 19.12.2023
• 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

A grid-connected voltage type rectifier frequency division simulation resistance control method under an unbalanced power grid comprises the following steps: firstly, acquiring a power grid current signal and a direct current bus voltage signal under a two-phase static coordinate system; secondly, according to the idea of frequency division control, based on a notch filter and a band-pass filter, a direct-current component and a double-frequency component of the direct-current bus voltage are extracted respectively; secondly, designing a direct-current voltage control loop to regulate and control a direct-current component of the direct-current bus voltage, and designing a pulsating voltage control loop to suppress a frequency-doubled component of the direct-current bus voltage caused by the unbalanced power grid; and finally, based on the idea of analog resistance control, calculating by using the output of the two voltage controllers and the sampling power grid current signal, filtering through a band-pass