Big-signal decomposition decoupling control method and device for buck-boost converter

• Main Authors: Huang Xianfeng, Lu Yimin, Zhu Haimeng
• Format: Patent
• Language: Chinese; English
• Published: 24.08.2016
• 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 big-signal decomposition decoupling control method and device for a buck-boost converter, and the method comprises the steps: enabling a converter system to be divided into a disturbance part, a current ring controlled object and a voltage ring controlled object, so as to build a big-signal circuit model of the converter; carrying out the feedforward decoupling of the disturbance part; carrying out the inverse system decoupling and linear feedback of the current ring controlled object, and compensating for the current ring controlled object as a pseudo linear system, wherein a compensated current ring open-loop transfer function is a one-order pure integration element; carrying out the inverse system decoupling and linear feedback of the voltage ring controlled object, and compensating for the voltage ring controlled object as a pseudo linear system, wherein a compensated voltage ring open-loop transfer function is a unit system. The method can achieve the independent control of the