MPPT-SAZE Algorithm for Solar PV Array Powered Series-Connected 5-Phase Induction Motors Supplied Off a Z-Source and Dual-Inverter

Abstract

This paper proposes a new single-stage solution for solar photovoltaic (PV) array powered series-connected 5-phase induction motors (SC5PIM) under open-end winding (OEW) supplied off a Z-source and dual-inverter, where the Z-source converter serves dual purposes. The first purpose is of maximum power point tracking (MPPT) by adjusting the duty ratio based on a sample-averaged zero-sequence elimination (SAZE) method in order to extract optimum power from the PV modules. Whereas the second purpose it serves is to feed the dual-inverter system of the SC5PIM-OEW topology, which has been investigated for the first time. Furthermore, the dual-Inverter system of SC5PIM-OEW topology is controlled using space vector pulse width modulation (SVPWM) technique with rotor flux-oriented control (FOC) strategy in order to produce a very high reliable adjustable speed drive system. The proposed topology and designed controller were modeled to run on the FPGA in real-time, using the OPAL-RT 4500 simulator under different environmental conditions. Simulation results clearly show that the designed controller can effectively track the rotor speed and obtain good dynamic performance, where the maximum and average error values are less than 0.5 rad/s of the reference speed signal during various conditions.

Keywords

• MPPT technique
• open-end winding
• SAZE scheme
• series-connected 5-phase induction motors
• solar PV array
• Z-source converter