Abstract
Traditional modular multilevel converter (MMC) applications in medium voltage induction motor drive are difficult, particularly at low speeds because of the higher magnitude of the voltage ripple of the sub-module capacitor. This paper uses a hybrid MMC, particularly at low frequencies, to achieve a lower peak-to-peak voltage ripple of the sub-module capacitor. The vector control strategy with the closed-loop speed control indicates an accurate and wide-speed range. MATLAB / Simulink is used to simulate and obtain the simulation results of hybrid and traditional MMC with induction motor drive and compare from the standpoint of capacitor voltage ripple. The results are shown the reduction of peak-to-peak voltage ripple of the sub-module capacitor as the hybrid MMC is operated.
Highlights
Multilevel converter topologies in the power electronic industries are generally accepted as one of the latest technological advances
The hybrid modular multilevel converter (MMC) was simulated under three cases to show the reduction of peak-topeak voltage ripple of the SM capacitor and compared with the traditional MMC
The results show that the ability of hybrid MMC to drive the induction motor at constant load torque with wide speed range
Summary
Multilevel converter topologies in the power electronic industries are generally accepted as one of the latest technological advances. The modular multilevel converters in recent years are become efficient topology in high and medium-power applications because of their efficiency, modularity, low redundancy expense, scalability [3,4,5,6] They have reshaped power transmission systems based high voltage source converters (VSCHVDC) [7, 8], and are considered to be the key technology for developing successful DC Super Grids [9]. They are used in the medium-voltage motor drive applications in recent years [10,11,12,13,14,15,16]. MMC has major advantages: it can increase the number of levels without increased control complexity or unequal distribution of losses and does not need costly and bulky isolation transformers
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