Modeling and Control of Single-Stage Quadratic-Boost Split Source Inverters

Abstract

This paper aims to develop the recently introduced Spilt-Source Inverter (SSI) topology to improve its boosting characteristics. New SSI topologies with high voltage gain are introduced in this paper. The proposed converters square the basic SSI's boosting factor by utilizing an additional inductor, capacitor, and two diodes. Thus, the proposed converters are called Quadratic-Boost (or Square-Boost) SSIs (QBIs or SBIs). Four different QBI topologies are presented. One with continuous input current (CC-QBI), and the other draws a discontinuous input current (DC-QBI) but with reduced capacitor voltage stresses. This paper also introduces the small-signal model of the CC-QBI using state variables perturbance. Based on this model, the closed-loop voltage and current control approach of the dc-boosting factor are designed. Moreover, a modified space vector modulation (MSVM) scheme is presented to reduce the input current ripples. To evaluate the performance of the proposed topologies, a comparative study between them and the other counterpart from different perspectives is introduced. It can be found that the CC-QBI topology has superior boosting characteristics when operating with low input voltage compared with their counterparts. It has a higher boosting capability, lower capacitor voltages, and semiconductor stresses, especially when high voltage gains are required. These merits make the proposed topologies convenient to the Photovoltaic and Fuel-Cell systems. Finally, the feasibility of the suggested topology and the introduced mathematical model is verified via simulation and experimental results, which show good accordance with the theoretical analysis.INDEX TERMS Split-source inverters (SSI), quasi-z source inverters, dc-ac boost converter, space-vector PWM.

Improved Responses of Grid Connected Quadratic Boost Inverter Based on Super-Twisting Sliding Mode Control

“…There are many PWM schemes of the QBI. Although, the modified space vector modulation (MSPWM) introduced in [21] ensures no low-order current ripples of the supply current. It uses a flat bottom modulating signal like that shown in Fig.…”

“…To decouple the control of the ac and dc side from each other, two independent manipulating variables must exist so that one of them is used in the control. The regulated MSVM which is firstly proposed by [37] for the basic SSI and developed in [21] for the QBI, is more suitable for the gridconnected applications. In this modulation scheme, the minimum envelops of the per phase duty cycles (𝑑 𝑎 , 𝑑 𝑏 , 𝑑 𝑐 ) are kept constant to (1 − 𝑀 𝑑𝑐 ) as shown in Fig.…”

“…For further improvements, the authors proposed a new topology called by Quadratic-Boost Inverter (QBI), shown in Fig. 2(a), which combines the features of ZSI, quadratic dc-dc boost converter, and SSI in a single circuit [21]. The main features of these topologies are • retain the basic structure of split-source inverter,…”

Enhanced Finite Control Set-Model Predictive Control for Three-Phase Split-Source Inverters

“…Another research effort has concerns about improving the boosting capabilities of the SSI topology. The proposed topologies in [9]- [14] extend the switched impedance concepts used for dc-dc converters, Zsource, and Y-source inverters to increase the SSI output voltages using additional input passive elements.…”

Current Ripple Evaluation of Space Vector Modulated Five-Phase Split-Source Inverters

“…The SSI topology offers potential superior features compared with ZSI, which can be summarized as follows [9] Compared with the two-stage architecture, no additional active switch is required in the SSI. However, the SSI suffers from some demerits, such as rapid commutations for the input diodes, and higher current stresses for the lower switches [10], [11].…”