An extended boost diode-clamped impedance source inverter for electrical vehicle powertrain motor drive

Abstract

Improving Electric Vehicle motor drive fast charging and discharging analysis use extended boost Diode-Clamped Z- source Impedance Inverter. A single–stage power conversion by using unique impedance (Z) network with inverter circuit to boost AC output voltage through shoot-through (ST) and non-ST. In this case, Z networks are directly responsible for balancing the inductive voltage boosting and output levels. The ST states limit the modulation index and cause huge ST current in the inverter phase legs.The conventional Pulse Width Modulation (PWM) methods for Z-source Neutral Point Clamped (NPC)-Multi Level Inverter (MLI) use the full ST (turned ON all the inverter switches in a leg), which occupies more switching commutations per switching cycle and leads to unequal inductor charging and discharging, resulting in more harmonics in the output voltage and current waveforms. It is noted from earlier developmental drifts that by using a single Z-network, performance dreadful conditions are usually expected. Creating the full ST misguides to extra switching commutations as well as unequal charging and discharging of inductor. The proposed Z-source MLI (Space Vector Modulation) SVM technique offers a Top and Bottom ST for charging the Z-network inductors with balance the inverter DC-link capacitor. The simple mathematical function used based on two-level SVM Z-source MLI SVM proposed and has more flexibility to choosing the switching patterns without complex function; thereby it offered real time implementation in simpler manner. The also paper contributes a comprehensive study on development procedure of proposed Z-source MLI SVM FPGA environment validation. The proposed SVM is implemented with three-level Z source neutral point MLI through MATLAB simulation and 1-kW experiment prototype is built to verify the theoretical analysis.