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Samelius S. Oliveira
PPGEEC, Universidade Federal do Ceará, Sobral, CE
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Isaac R. Machado
PPGEEC, Universidade Federal do Ceará, Sobral, CE
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Joham L. D. S. Albuquerque
Faculdade de engenharia elétrica, Universidade Federal do Ceará, Sobral, CE
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Alan R. S. Silva
Faculdade de engenharia elétrica, Universidade Federal do Ceará, Sobral, CE
Keywords:
Modular multilevel converter, photovoltaic system, average model, power mismatch
Abstract
This paper presents a study of modular multilevel converter (MMC) to link a photovoltaic plant to medium voltage. The topology is based in multistrings where a PV array are connected on submodules (SM’s) of the converter. The methodology was use arm average model to represent arm dynamics of the converter. The loop output currents and virtual DC bus voltage control are performed using classical control techniques based on frequency response and PI controllers. Furthermore, the behavior of the MMC was analyzed and discussed during unbalance in power generation (power mismatch) whose compensation is made through the differential currents. Computational simulations are performed to show system operation under standard conditions and evaluate performance of the control strategy in relations to disturbances. The results proved the effectiveness of the control techniques used as well as ability of differential currents to handle with internal power mismatches of the MMC
