Single-Phase Single-Stage Integrated Ćuk Inverter Operating in Discontinuous Conduction Mode for Autonomous Operation Rafael Takeshi Inoue, Anderson Aparecido Dionizio, Leonardo Poltronieri Sampaio, Sérgio Augusto Oliveira da Silva, Moacyr Aureliano Gomes de Brito International Journal of Circuit Theory and Applications, 2025 DC microgrids are required to supply energy to AC local loads in many applications. To address this need, integrated inverters have been rising as an excellent solution for interfacing AC loads with the microgrid due to their good conversion efficiency, lower costs, and enhanced reliability. Thus, this paper explores and analyzes the single‐phase single‐stage integrated Ćuk inverter (ICI). The ICI is designed to operate in discontinuous conduction mode with an improved switching strategy. The inverter's output voltage is regulated by a single‐loop control system employing a proportional integral multiresonant controller. This paper presents a comprehensive qualitative and quantitative mathematical analysis of the ICI, such as the main system equations, component sizing, and the converter modeling using the state‐space technique associated with the small‐signal analysis. The ICI distinguishes itself by (i) reduced number of electrical/electrical components; (ii) operation with a single high‐frequency switch, while the remaining bridge switches operate at low frequency; and (iii) ability to step up the input voltage while supplying an AC voltage in its output. The feasibility and functionality of the ICI are demonstrated from computational simulation and experimental results. The ICI provides an AC output voltage with low harmonic distortion and presents an efficiency greater than 96%.
Integrated Zeta–Ćuk-Based Single-Phase DC/AC Inverter for Standalone Applications Aylla R. M. Guedes, Anderson A. Dionizio, Óliver P. Westin, Leonardo P. Sampaio, Sérgio A. O. da Silva Processes, 2025 Power electronics has significantly contributed to advances in developing single-stage integrated converter topologies, enabling DC/AC conversion with voltage step-up capability in a compact and efficient structure. This work proposes a novel Integrated Zeta–Ćuk Inverter (IZCI), derived from combining the Zeta and Ćuk DC/DC converter structures. In addition, the proposed topology achieves high efficiency and full utilization of the input voltage. A potential application for the IZCI topology involves DC microgrids, in which the proposed topology can supply AC local loads, achieving high power quality, such as a low total harmonic distortion (THD). The IZCI operates in discontinuous conduction mode (DCM), exhibiting three distinct operating stages for each switching period. The DCM operation guarantees a linear relationship between output and duty cycle, simplifying the control strategy and requiring fewer sensors, thereby reducing the cost and processing requirements. The feasibility and performance of the IZCI topology are evaluated and validated through experimental results in a standalone application. The results demonstrate high energy conversion efficiency and reliability, providing an AC output voltage with low harmonic distortion.
Generalized state-space averaging modeling to fourth-order power converters operating in DCM Anderson Aparecido Dionizio, Leonardo Poltronieri Sampaio, Sergio Augusto Oliveira da Silva International Journal of Circuit Theory and Applications, 2025 This paper presents a novel methodology for correcting the state‐space averaging (SSA) modeling for DC‐DC power converters represented for fourth‐order systems operating in discontinuous conduction mode (DCM). SSA modeling has been widely employed for converters operating in continuous conduction mode (CCM), obtaining a good similarity between the switched converter and the mathematical model. In contrast, when the converters work in DCM, significant deviations between the average and RMS values imply errors in the SSA model. Hence, the proposed generalized SSA modeling methodology provides an accurate model to aid the controllers and system design. Consequently, the proposed technique can be applied to distinct fourth‐order power converters such as Zeta, Ćuk, and SEPIC in several applications. Additionally, SSA corrections can be associated with different techniques for obtaining the small‐signals representation. Simulation and experimental results and mathematical analyses that prove the feasibility and functionality of the proposal are addressed.
A Novel Single-Phase Bidirectional Integrated Ćuk-Based Inverter Rafael T. Inoue, Anderson A. Dionizio, Óliver Pincelli Westin, Leonardo P. Sampaio, Sérgio A. O. da Silva International Journal of Circuit Theory and Applications, 2025 Bidirectional inverters have become increasingly important for interfacing DC systems with the AC utility grid. Moreover, integrated inverters have gained attention due to their capability to boost the input DC voltage while simultaneously supplying a sinusoidal AC output voltage. In this context, this paper proposes a novel single‐phase bidirectional integrated Ćuk‐based inverter (BICI) topology that combines a Ćuk DC–DC converter with a full‐bridge voltage source inverter (VSI). The proposed BICI is designed to operate in discontinuous conduction mode and supports two operating modes: (i) inverter mode and (ii) rectifier mode. Some main advantages associated with the proposed BICI can be highlighted: (i) a lower DC–bus voltage level compared to the traditional VSI; (ii) passive elements exhibit very similar dynamics in both power flow directions, unlike other comparable topologies; and (iii) under current‐mode control, the BICI can be operated with a conventional proportional‐integral controller, due to the employed modulation strategy, static linear gain, and frequency response. The operation and feasibility of the BICI are validated through computational simulation and experimental results. The BICI achieves an efficiency of up to 90.3% at its rated power, while injecting grid current with low harmonic content in both operating modes.
Improved Modified Zeta Inverter for Single-Phase Grid-Tied System Óliver Pincelli Westin, Rafael Takeshi Inuoe, Anderson Aparecido Dionizio, Leonardo Poltronieri Sampaio, Sérgio Augusto Oliveira da Silva 2025 40th Conference on Design of Circuits and Integrated Systems Dcis 2025 Proceedings, 2025
Enhanced Secondary Control for Power/Current Sharing in DC Microgrids Considering Communication-Links Failures and Current and Voltage-Controlled Converters Juliana C. Neves, Rafaela D. Silveira, Sergio A. O. da Silva, Leonardo P. Sampaio, Sebastián de J. Manrique Machado Iet Renewable Power Generation, 2025 The stable operation of DC microgrids requires robust secondary control strategies capable of ensuring accurate power sharing and bus voltage regulation, even under adverse conditions. Traditional approaches are generally based on proportional sharing according to the nominal capacities of the converters, which limits operational flexibility in scenarios requiring critical load prioritisation or maintenance strategies. This paper proposes a distributed secondary control strategy that enables individualised power allocation among converters without compromising system stability. The effectiveness of the proposed approach is validated through simulations and practical experiments under different operating conditions, including load variations, disturbances, and communication failures, demonstrating its accuracy, robustness, and applicability.
Enhanced Space-State Reduced-Order Microgrid Model in Common DQ-Reference Frame Sebastian de J. Manrique Machado, Sergio Augusto Oliveira da Silva, Jose R. B. A. Monteiro, Azauri A. de Oliveira 2019 IEEE 15th Brazilian Power Electronics Conference and 5th IEEE Southern Power Electronics Conference Cobep Spec 2019, 2019
An improved series-parallel processing applied to a singlephase line-interactive UPS system for low power and low cost applications Pcim Europe Conference Proceedings, 2014
Applying a nonlinear PID in a singlephase PLL control Luciane Agnoletti dos Santos, Mauricio dos Santos Kaster, Sergio Augusto Oliveira da Silva Pedes 2012 IEEE International Conference on Power Electronics Drives and Energy Systems, 2012
An ANN speed observer applied to three-phase induction motor Tiago Henrique dos Santos, Alessandro Goedtel, Sérgio Augusto Oliveira da Silva, Marcelo Suetake Lecture Notes in Computer Science Including Subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics, 2012
Power quality conditioner with series-parallel compensation applied to single-phase systems Proceedings of the 2011 14th European Conference on Power Electronics and Applications EPE 2011, 2011
Harmonic content identification based on neural method for single phase power systems 2009 13th European Conference on Power Electronics and Applications EPE 09, 2009
A comparative analysis of p-PLL algorithms for single-phase utility connected systems 2009 13th European Conference on Power Electronics and Applications EPE 09, 2009
Analysis and design of a three-phase PLL structure for utility connected systems under distorted utility conditions International Power Electronics Congress CIEP, 2004
Performance Analysis of Three-Phase Line-Interactive UPS System with Active Power-Line Conditioning IECON Proceedings Industrial Electronics Conference, 2003
Comparative analysis of control algorithms for three-phase line-interactive UPS systems with series-parallel active power-line conditioning using SRF method PESC Record IEEE Annual Power Electronics Specialists Conference, 2000
Three-phase series-parallel compensated line-interactive UPS system with sinusoidal input current and sinusoidal output voltage Conference Record IAS Annual Meeting IEEE Industry Applications Society, 1999
