A Novel Dc Voltage Detection Technique in Cascaded H-Bridge Multilevel Converter Based Photovoltaic System
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 6
Abstract
In this paper a cascaded H-Bridge multilevel converter based Photovoltaic (PV) system with no voltage or current sensors at the dc-side is proposed. Removing the dc-side sensors simplifies the hardware, resulting in lower cost and higher reliability of the PV system. A novel dc voltage detection technique is established by estimating the capacitors’ voltages from the output ac voltage of the inverter using single voltage sensor at the ac side of the converter. The scheme allows replacing all dc-side voltage sensors by a single voltage sensor at the ac-side of the converter. Furthermore, the dc current sensors, conventionally required for the maximum power tracking (MPPT), are also removed. Instead, the outputs from the capacitors’ voltage control systems are utilized for the MPPT. The effectiveness of the proposed system with no voltage and current at dc side of the converter is demonstrated on a 2 kW single-phase 7-level CHB converter based PV system.The results are obtained from the MATLAB/ SIMULINK environment.
Authors and Affiliations
Harsha Patle, Pranita Chavan
Keywords
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