Integration of Photovoltaic Power Units to Power Distribution System through Modular Multilevel Converter

Seyed Mehdi Hakimi and Amin Hajizadeh
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Seyed Mehdi Hakimi: Department of Electrical Engineering, Damavand Branch, Islamic Azad University, Damavand 39718-78911, Iran
Amin Hajizadeh: Department of Energy Technology, Aalborg University, 6700 Esbjerg, Denmark

Energies, 2018, vol. 11, issue 10, 1-13

Abstract: With the growing of using photovoltaic (PV) units in power distribution systems, the role of high-performance power electronic converters is increasing. In this paper, modelling and control of Modular Multilevel Converter (MMC) are addressed for grid integration of PV units. Designing a proper controller for MMC is crucial during faulty conditions to make the converter stable and provide proper dynamic performance. To achieve this goal, a dynamic model of MMC is presented which it includes symmetrical components of voltage and current. Then, adaptive robust current controllers are developed based on sliding mode and fuzzy controllers for MMC and then the robustness and stability of the controllers are proved by the Lyapunov theory. To implement the proposed controllers under unbalanced grid voltage fault, positive and negative sequences current controllers are implemented to compensate the effect of grid voltage fault and load power variation. Finally, numerical results are shown to evaluate the performance of MMC. In the end, the experimental results are given to prove the controller performance. The outcome indicates that the proposed current controllers are more effective under voltage disturbance conditions and could satisfy the stability of MMC.

Keywords: control; modular multilevel converter; photovoltaic integration; fuzzy control; sliding mode control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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