| VSC-HVDC(Voltage Source Converter-High Voltage Direct Current) transmission technology is the use of full-controlled power electronic devices conveying new electricity transmission and distribution technology。For solving the island power transmission, the field of new energy grid access, grid interconnection and urban ring network, VSC-HVDC is a great significance to study.In this paper, VSC-HVDC transmission technology and multi-level modular for the study of the basic working principle of the converter topology and control strategy to study the MMC topology, and described its control method and modulation mode, verify the feasibility of its application. This structure is VSC-HVDC transmission system half-bridge MMC on the basis of a new development, the structure can meet the decoupling of active and reactive power control, black start, multiport transfer function. In this paper, two important aspects of the structural control of the way-the choice of modulation mode and capacitor voltage balance control method, conducted in-depth study and discussion. First, comparative analysis of the existing VSC-HVDC structure, including a two-level and multi-level structure. Secondly, detailed analysis the working principle of the structure modulation with Capacitance voltage balance control strategies. Its system-level simulation, and control to meet the stability of the rectifier side and inverter side.This paper, the structure of specific technical theoretical elaboration and simulation studies, including VSC-HVDC transmission technology, PWM modulation technique, cascaded H-bridge multi-level modular inverter control strategy. MATLAB simulation of the above-mentioned technical result proved the correctness and feasibility of the system structure and control methods. |
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