Modular multilevel converter circulation harmonic suppression control method, device and equipment

• Main Authors: DENG FUJIN, JIANG HUIJIE
• Format: Patent
• Language: Chinese; English
• Published: 11.08.2023
• 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

The invention discloses a modular multilevel converter circulation harmonic suppression control method, device and equipment, and relates to the technical field of multilevel power electronic converters. According to the invention, the duty ratio of each phase of sub-module (SM) is calculated through a voltage reference and modulation method, and the harmonic voltage is calculated by combining the sampled sub-module capacitor voltage. And then, a quasi-proportional resonance (PR) controller is introduced to suppress bridge arm harmonic voltage, so that circulating current harmonic is suppressed. The control method can be easily executed by a digital signal processor (DSP) without accessing a switching signal obtained in a field programmable gate array (FPGA), and is suitable for a single-phase or multi-phase system; in addition, the method does not need to collect bridge arm current. 本发明公开了模块化多电平换流器环流谐波抑制控制方法、装置及设备，涉及多电平电力电子换流器技术领域。本发明通过电压参考和调制方法计算各相子模块(submodule，SM)的占空比，再结合采样得到的子模块电容电压计算得到谐波电压。然后，通过引入准比例谐振(P