Lookup NU author(s): Zhengyu Zhao,
Dr Mohammed Elgendy,
Dr Matthew Armstrong,
Dr Musbahu Muhammad
This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by IEEE, 2019.
For re-use rights please refer to the publisher's terms and conditions.
Compared to the dual-stage inverter, quasi-Z-source inverter (qZSI) offers higher reliability and lower switch count but suffers from higher voltage stress on components. The qZSI is normally controlled by the simple boost control (SBC) method that adds reference signals to the sinusoidal PWM to generate the shoot-through state. This paper develops a constant boost control method with third harmonic injection. Compared to the SBC, the proposed control method increases the voltage boost and reduces the voltage stress on switches and passive components of the qZSI, making it suitable for PV grid-connected applications. The third harmonic signal is produced and injected in a way that keeps it in phase with the reference sinusoidal signals, regardless of the solar irradiance level. This reduces the total harmonic distortions (THD) and improves the output power quality. Simulation results are presented for validation of the theoretical analysis and controller design.
Author(s): Zhao Z, Elgendy MA, Armstrong M, Muhammad M
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: IEEE 21st European Conference on Power Electronics and Applications (EPE'19 ECCE Europe)
Year of Conference: 2019
Online publication date: 02/09/2019
Acceptance date: 01/03/2019
Date deposited: 26/11/2019