Photovoltaic (PV) Inverters and Micro Inverters
Technical Dialogue Session
Renewable Energy Systems I
Inverter, Space Vector modulation, Compensation
In Photovoltaic (PV) systems with a two-level (2L) voltage source inverter (VSI), the occurrence of partial shades and/or the mismatching of PV arrays results in poor utilization of available power. In order to overcome this issue, a new configuration known as hybrid 2/3 level (2/3L) inverter is presented in this paper. The topology is formed by adding two half bridge modules to 2L VSI. It addresses one of the common phenomena which is the unequal voltage sharing of the PV arrays addresses by a new switching sequence. This new switching sequence allows the independent operation of two PV arrays to yield maximum output. The performance of proposed hybrid 2/3L inverter configuration is studied and compared with the conventional switching sequence for varied input voltages. The effect of unequal voltage sharing in PV arrays does not reflect in the ac side waveforms when the proposed switching sequence is used and it is evident from the simulation and hardware results.