Abstract
In this paper, a new configuration of single DC source hybrid packed U-cell (H-PUC) converter with reduced number of components is proposed. The proposed H-PUC only requires one dc source, twelve power switches, and three capacitors to provide 23-level output voltage. It is comprised of two high voltage low frequency (LF) and low voltage high frequency (HF) sub-modules which leads to less power losses and higher efficiency of the proposed H-PUC converter. Moreover, a finite control set model predictive control (FCS-MPC) method is proposed to generate 23-level staircase output voltage with low THD and to regulate voltages of three capacitors to their desired values simultaneously. A real-time model of the proposed 23-level H-PUC converter and its suggested FCS-MPC are developed and implemented in OPAL-RT OP4510 platform to evaluate and validate the feasibility of the proposed H-PUC in grid-connected operation mode. The provided real-time implementation results verify and demonstrate the performance and viability of the proposed 23-level H-PUC and its associated FCS-MPC to provide low THD 23-level output voltage and all three capacitors voltages balancing.
Highlights
The global adoption rate of renewable energy sources has been increasing significantly in the past years and shows no sign of slowing down
The main requirement for a photovoltaic system is a suitable voltage source inverter (VSI), which converts the DC voltage generated by the photovoltaic arrays to AC voltage that can be injected to the grid [2]
The injected current to the grid is almost sinusoidal, which implies that its harmonic content is minimal. Another interesting feature of this topology is that the high frequency switches withstand much lower DC bus voltage while conducting the same load current, which leads to less power loss in the power switches and higher overall efficiency of the proposed HYBRID PUC (H-PUC) inverter
Summary
The global adoption rate of renewable energy sources has been increasing significantly in the past years and shows no sign of slowing down. SORTO-VENTURA ET AL.: 23-LEVEL SINGLE DC SOURCE HYBRID PUC (H-PUC) CONVERTER TOPOLOGY WITH REDUCED NUMBER OF COMPONENTS capable of providing low THD staircase multilevel output voltage, low electromagnetic interference (EMI), low dv/dt, and lower switching frequency. The proposed topology, shown, is based on a cascade connection of two PUC5 inverters where the DC source of the second converter is replaced by a voltage regulated DC capacitor, which reduces the burden of using multiple isolated bidirectional DC sources. These new switching variables are used in the MPC to generate the appropriate output voltage level of the converter. The step in the MPC design is to define the control objectives
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