Performance analysis of PV fed single phase Z-source inverter

Abstract: This paper deals with performance analysis of PV fed single phase Z-source inverter connected to Grid. The PV systems are interfaced to the grid invariably by a power electronic inverter. Many of the important characteristics of the PV generation are influenced by the design and performance of the inverter. Hence suitable models of the inverter are needed to analyze the PV systems. The Z source inverter has an ability to perform DC to AC conversion and buck boost operation in a single stage s. Generally, IEC-61730, 61215, 61701 standards are followed in India for interfacing PV generator to Grid. The PV Inverter should operate in stable mode within the standards specified by IEC. In this paper voltage fluctuations occur in PV system are studied in the z-source inverter model and THD analysis of each case is compared. The paper also consists of two different shoot through pulse generation techniques and an efficient control strategy is proposed to the single phase grid connected z-source inverter.

Keywords: Photovoltaic (PV) cell, Z-source inverter, Boost Factor, Irradiance, Maximum Boost Z-source Inverter, Maximum Power Point Tracking (MPPT), Total Harmonic Distortion (THD)