Performance of Switched Inductor-qZSI on different Controls Methods for PV Application

Abstract

The performance of the Switched Inductor Quasi Impedance Source Inverter (SL-qZSI) for the Simple, Maximum, and Maximum Constant Boost Control Methods for PV Application is compared in this study.  Because a second DC-DC converter must be added to the inverter circuit to achieve the desired output due to the significant voltage differential between the AC output side and the DC input side, the suggested control technique intends to increase the efficiency of the DC/AC converter. This two-stage system i.e., DC-DC conversion and then DC to AC conversion not only reduces the efficiency but also dilutes the dynamic response. Researchers have recently suggested alternative ZSI to maximize the boost factor and enhance the functionality of the inverters (Input Side).  To satisfy both requirements, SL-qZSI is suggested. The SL-qZSI enhances input current and reliability compared to conventional ZSI. Additionally, compared to other ZSI, the proposed SL-qZSI has lower shoot-through (ST) current, current stress on inductors & diodes, and voltage stress on capacitors. Additionally, it prevents the starting inrush current, which may harm the equipment. The boost factor and gain of the maximum boost control are found to be high compared to others for the same value of the modulation index in the control component, but a large inductor is needed due to the significant ripple in the input current and shoot-through current. The inductor's high value results in an increase in both the inverter's size and price. Results from simulations have been run under the PV panel's Standard Test settings.