Robson Bauwelz Gonzatti

Area of research

Control and Systems Engineering · Electrical and Electronic Engineering

Research interest

Research topics from publications: An Overview of Converter Topologies and Their Derivations and Interrelationships; Grid-connected converter without Interfacing Filters: Principle, Analysis and Implementation; Virtual Impedance-based Grid Synchronization for Converters Connected Through Long Cables; Switched Capacitor MMC Submodule Voltage Balancing with Reduced Number of Voltage Sensors; Modular Multilevel Converter with Minimum Arm Inductance and Automatic Sub-module Voltage Balance - Y-Matrix Modulation and its Theoretical Proof of the Automatic Voltage Balance; Analysis, Modeling, and Experiments of a Nonlinear Inductor-Based Fault Current Commutation Strategy for a Hybrid DC Circuit Breaker; Y-Matrix Modulation for SC-MMC Medium Voltage Grid-Tie Converter; Low Frequency Versus High Frequency PWM in Medium Voltage, High Power, Higher Level Inverters: THD, Harmonic Filtering, and Efficiency Comparison; Steady-State Analysis of the Switched-Capacitor Modular Multilevel Converter with Γ-Matrix; Capacitor Voltage Ripple Suppression of the Switched Capacitor Modular Multilevel Converter. Representative work: Canonical switching cell is known as the basic building block of dc-dc buck, boost, buck-boost, Ćuk converters, voltage/current source inverters (VSI/CSI) as well as multilevel converters (MLCs). This article reveals the existence of another basic switching cell as a singular structure of the canonical switching cell. The proposed new basic cell can constitute single-ended primary-inductor converter (SEPIC), Zeta converters, and Z-source converters. Each of the basic switching cells has the simplest form with two complementary switches, one inductor and one capacitor. An approach to construct a dc-dc converter by connecting source/load to the basic switching cells’ terminals is demonstrated. In this paper, the concept of grid-connected inverter without interfacing filters is proposed. Conventional grid-side voltage sensors and traditional phase-locked loop (PLL) are removed. Only the grid current is feedback to implement grid synchronization and decoupled P/Q control. 60-Hz sinusoidal output current is achieved relying on grid-side impedance only. The controller employs virtual impedance to couple with a wide range of grid-side impedance variations. With the proposed controller, the grid-connected inverter is capable of 1) decoupling the output real and

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