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

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 contr...

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Bibliographic Details
Published inEnergies (Basel) Vol. 11; no. 10; p. 2753
Main Authors Hakimi, Seyed, Hajizadeh, Amin
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2018
Subjects
Computer simulation
control
Control algorithms
Controllers
Converters
Current sources
Electric potential
Electric power distribution
fuzzy control
modular multilevel converter
Modular systems
photovoltaic integration
Photovoltaics
Robust control
sliding mode control
Voltage
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en11102753