Adaptive DC-Link Voltage-Controlled PV Grid-Connected DTL-VSI With Reduced Switching Losses and Switching Frequency

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Abstract
This article discusses, a photo-voltaic (PV) grid connected dual two-level voltage source inverter (GCDTL-VSI) to improve the power quality, reliability, and efficiency of the grid. In PVGCDTL-VSI, VSI-1 is employed to compensate the current related power quality concern, while VSI-2 is employed to transfer real power to the load and grid. In literature, the dc-link voltage maintains constant at the input terminal of VSI-1 under low power injection. As a result, there will be significant switching losses and stress on the inverter switches. In the proposed method, VSI-1 with LC-filter, and an adaptive dc link voltage control technique is used to alleviate the switching losses and stress on the inverter switches. Additionally, the two-leg VSI employs for supply real power to the load and grid instead of the conventional approach uses three-leg VSI. In PVGCDTL-VSI, a model predictive control (MPC) with multiconstraint technique is used to generate the switching pulses, dc-link capacitor voltage balancing, and reduce switching frequency. To reduce the weighting factor control complexity, Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) approach is employed in PVGCDTL-VSI. To evaluate the effectiveness and performance of the PVGCDTL-VSI, are carried out simulation and experimental tests.
Funding Information
  • Science and Engineering Research Board (SERB), Department of Science and Technology, India (CRG/2023/003280)
  • Centre of Excellence for E-Mobility, National Institute of Technology Warangal, India

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