Abstract
This paper proposes an enhanced Deadbeat Controller (DBC) for a grid-tied Flying Capacitors Inverter (FCI). The proposed DBC guarantees the balancing of the capacitors’ voltages while injecting current to the grid with lower Total Harmonics Distortion (THD). The proposed controller has the following advantages: 1) Improved current tracking quality even at zero crossing instants by using a weighted state-space model, 2) Superior steady-state performance (lower current THD) compared to other prediction-based control techniques such as Finite-Control-Set Model Predictive Control, 3) The generated duty cycles are normalized to the common base when the desired state is out of reach within the sampling time, 4) Voltage Ride-Through (VRT) capability, and 5) Robustness to parameters variation. Theoretical analysis, simulation, and experimental results are presented to show the effectiveness of the proposed control technique in ensuring uninterruptible and smooth transfer of energy to the grid during normal/abnormal operating conditions (severe voltage sags, parameters variation, etc.).
Highlights
Solar and wind energy systems have been getting an increasing interest due to their benefits such as abundance, sustainability, cleaner electricity production, and consideration for many applications [1]-[3]
Among the widely used MLIs, the Flying Capacitors Inverter (FCI) is considered as an interesting topology due to the following advantages: 1) A single DC-source MLI where the number of output voltage levels can be expanded by connecting more cells in series; 2) Provides an extended range of control actions and improves filter bandwidth taking advantage from the switching state redundancy
This paper proposed an enhanced Deadbeat Control (DBC) technique for a gridtied Flying Capacitors Inverter (FCI)
Summary
Solar and wind energy systems have been getting an increasing interest due to their benefits such as abundance, sustainability, cleaner electricity production, and consideration for many applications [1]-[3]. This paper provides contributions in the following areas: 1) Apply a DBC strategy to tackle the multi-objective control problem (control of the capacitors’ voltages and the injected grid current) of a grid-connected FCI (to the best of our knowledge, this control technique has not been applied so far to this topology in the scientific literature); 2) Make use of a weighting factor in the state space model to improve the current tracking quality at the zero crossing instants; 3) Propose a normalization of the duty cycles quantities to the common base when the desired state is out of reach within the sampling time; 4) Provide extra VRT capability; 5)Compare the results obtained by the proposed DBC strategy with those attained when another predictionbased control technique (Finite-Control-Set Model Predictive Control) is applied to the studied system
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
