Abstract
In this paper, a mathematical model and control methods of a modular multilevel converter are examined in per unit. Some control algorithms, like a sorting algorithm, circulating current control, proportional resonant controller and pulse width modulation techniques which are applicable on this converter are investigated. The average value model is used in per unit for the converter and it is combined with circulating current control method and propotional resonant current controller to suppress the second harmonic component in the circulating current. The effect of the circulating current harmonics on the resonance frequency is investigated. A Matlab/Simulink model is prepared for the simulation of converter modeled on the approach of the average value model and the results are generated from the simulation and they are discussed.
Highlights
The modular multilevel converters (MMC) has an important impact on the design of AC/DC conversion in high power applications. It can be manufactured easier for high power application under medium and high voltage levels due to its modular structure
The control of the circulating current is based on the proportional resonant controller (PR) controller and the system is analyzed in Matlab
The results show that the controller is significantly effective for suppressing the circulating current
Summary
The modular multilevel converters (MMC) has an important impact on the design of AC/DC conversion in high power applications. Its main structure and control strategies presented firstly in [2]-[4] and opened an important research area in the high voltage direct current transmission. While these converters are operated as the front end grid connected rectifiers, they can be operated as the inverter for the torque and speed control of three-phase induction and synchronous motors. The approach in [11] presents a technique for selecting the arm inductance and module capacitance based on the power capacity of converter and resonance frequency The selection of these parameters can be carried out independent to the power rating of the converter if the per unit sytem is used.
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