© 2021 JETIR June 2021, Volume 8, Issue 6 www.jetir.org (ISSN-2349-5162) JETIR2106165 Journal of Emerging Technologies and Innovative Research (JETIR) www.jetir.org b161 DUAL CLOSED-LOOP SCHEME WITH LEAD COMPENSATOR AND P CONTROLLER FOR QUASI Z SOURCE INVERTER V. Malathi Assistant Professor-II, Department of EEE, SCSVMV University, Kanchipuram-631 561, Tamil Nadu, India. Abstract : Over the last decade, numerous control schemes have been proposed by researchers for quasi-Z source inverter (qZSI) to provide fast dynamic response and good transient performances. This proposed project is an effective tuning method of dual- loop controller based on lead compensator and proportional (P) controller for single-phase qZSI to ensure reliable DC-link power regulation. Specifically, lead compensator and P controller act as voltage control and current control loop, respectively, to generate the desired shoot through duty cycle feeding towards the unipolar carrier-based pulse width modulation (CB-PWM). The lead compensator contributes to move the system poles from the left to the right half of the s-plane while the P controller damps any high frequency oscillation occurrence caused by the newly sited complex conjugate pole pair. All simulation models and results which documented in this paper are carried out using MATLAB/Simulink software. Index Terms - Switched inductor quasi z source inverter, Boost inversion ability, Shoot through duty ratio, Total Harmonic Distortion. I. INTRODUCTION In recent years, Power generation systems based on Renewable Energy Sources (RESs), such as photovoltaic (PV), wind power, and fuel cells (FC), have remarkably [1] increased worldwide as alternatives to the conventional generation systems as shown in Figure 1. The main reason is the huge increase in the energy demand. Moreover, being based on RESs, the systems [2] are considered as environment friendly. The main characteristic of RESs is that the primary energy widely varies in nature, where it depends on the temperature, irradiation level, wind speed, stored hydrogen, etc. Therefore, power electronic interfaces functioning as power conditioning units are required. These units must assure an output power with high quality that is able to cope with wide input voltage variations and meet the required IEEE standards [3]. Figure 1. Power generation systems The cost of power electronic systems represents a substantial portion of the overall installation, so these systems should work with a high efficiency in order to reduce the energy cost [4]-[6]. Batteries have become one of the most promising energy resources in recent years and have increased enormously in the markets. DC/AC inverter is designed as the core of the battery system that inverts DC to AC supply waveform to suit remote stand-alone application or off-grid power system. II. EXISTING SYSTEM Voltage Source Inverters (VSIs) have been extensively used in various power electronic applications, including energy-storage systems. However, VSIs has some limitations and constraints [7]. First, the ac output voltage is lower than the input dc voltage and for that reason they can be characterized as buck converters. In order to boost the input dc voltage to the desired dc-link