Murilo Brunei da Rosa

Bio: Murilo Brunei da Rosa is an academic researcher from Universidade do Estado de Santa Catarina. The author has contributed to research in topics: Distribution transformer & Current transformer. The author has an hindex of 1, co-authored 2 publications receiving 4 citations.

LQG controller in cascade loop tuned by PSO applied to a DC–DC converter

Abstract: This work presents a Linear Quadratic Gaussian (LQG) controller in cascade loop applied to a Two‐Switch Forward Converter (2SFC). This arrange is suitable for low power battery chargers an...

AC-AC modular multilevel converter applied to solid-state transformers

Abstract: Currently, with the tendency of the smart grids in the power line distribution, the solid-state transformer become a suitable solution for this kind of the application. Several researchers are developing solid-state transformers in electric traction applications in order to reduce size and weight of traditional 50/60 Hz transformers. However there are studies in the area of smart grids. This paper presents the initial development of a the solid-state transformer applied to rural power line distribution aiming improve the power quality and meet the loads for higher power of rural consumers using a versatile single-phase to three-phase structure of solid-state transformer. This study deals with the analysis and implementation of the AC-AC modular multilevel converter applied as a part of the structure of solid-state transformer. This work presents a 1 kW AC-AC modular multilevel converter development. Simulation and experimental results for a scaled 0.7 kW prototype are presented.

A novel adaptive cascade controller design on a buck–boost DC–DC converter with a fractional-order PID voltage controller and a self-tuning regulator adaptive current controller

Abstract: The design of a cascade controller is demonstrated for a buck–boost converter that is combined with two control loops consisting of inner and outer controllers. The outer loop is implemented by a fractional-order proportional-integrated-derivative (FO-PID) controller that works as a voltage controller and generates a reference current for the inner control loop. To provide faster dynamic performance for inner loop, a self-tuning regulator adaptive controller, which tries to regulates the current with the help of a novel improved exponential regressive least square identification in an online technique, is designed. Moreover, in the outer loop, to tune the gains of the FO-PID controller, a novel algorithm of antlion optimizer algorithm is used that offers many benefits in comparison with other algorithms. The system provided by the boost mode is a non-minimum phase system, which creates challenges for designing a stable controller. In addition, a single loop controller is proposed based on a PID controller tuned by a particle swarm optimization algorithm to be compared with the cascade controller. Cascade loop can present significant benefits to the controller such as better disturbance rejection. Finally, the strength of the presented cascade control scheme is verified in different performing situations by real-time experiments.

Solid state transformer technologies and applications: A bibliographical survey

Abstract: This paper presents a bibliographical survey of the work carried out to date on the solid state transformer (SST). The paper provides a list of references that cover most work related to this device and a short discussion about several aspects. The sections of the paper are respectively dedicated to summarize configurations and control strategies for each SST stage, the work carried out for optimizing the design of high-frequency transformers that could adequately work in the isolation stage of a SST, the efficiency of this device, the various modelling approaches and simulation tools used to analyze the performance of a SST (working a component of a microgrid, a distribution system or just in a standalone scenario), and the potential applications that this device is offering as a component of a power grid, a smart house, or a traction system.

A MMC-SST based power quality improvement method for the medium and high voltage distribution network

Abstract: A modular multilevel converter based solid state transformer (MMC-SST) is proposed in this paper. By adopting the modular multilevel converter as the grid-connected converter at the high voltage (HV) side, the proposed MMC-SST can be applied to the high voltage level, and to comprehensively deal with the power quality problems in the High and medium voltage distribution networks. The topology and the operating characteristics of MMC-SST are analyzed, and the control strategies of the input stage, the isolation stage and the output stage of the MMC-SST are designed separately. A case study is carried out to verify the good performance of the proposed MMC-SST on the power quality improvement of the distribution network.

Efficiency optimization design of DC-DC solid state transformer based on modular multilevel converters

Abstract: In the recent decade, the solid-state transformer (SST) has been extensively investigated for the distribution systems. The basic idea of SST is to reduce the volume and weight of power transformer, as well as improve controllability and power quality of power systems. Among the existing SST topologies, modular multilevel converters (MMCs)-based SST is very promising due to its modularity and scalability, specifically for medium/high-voltage applications. Compared to the conventional full-bridge or half-bridge converters, MMC can generate controllable multilevel excitation ac voltage and potentially improve efficiency and controllability. In this paper, to minimize power losses, an optimization design strategy is proposed based on the optimum multilevel excitation voltage and optimum blocking voltage of semiconductor devices. The power losses are evaluated and compared based on semiconductor losses and core losses. The study results show that 1.2 kV and 1.7 kV Si IGBTs and 1.2 kV SiC MOSFET produce the minimum power losses under the selected multilevel excitation voltage. The study results also show the MMC-SST with the proposed optimization strategy has higher efficiency than the SST based on cascaded configuration.

A Novel Optimal Robust Design Method for Frequency Regulation of Three-Area Hybrid Power System Utilizing Honey Badger Algorithm

Abstract: This study proposes an innovative technique for the load frequency control (LFC) of a three-area hybrid power system by putting into consideration of honey badger algorithm-based fractional order proportional integral derivative (FOPID) controller. The algorithm’s veritable use is attempted by arranging a FOPID controller for the hybrid system’s frequency regulation; the incredible potential of the proposed algorithm is proven. The proposed HBA-based FOPID regulator is presented by comparing its results with other current methods. It is seen that the said regulator is more viable for the frequency control contrasted with the regular regulator by considering a change in system parameters and different paces of RES penetration. It is also seen that the recommended controller is found to be more effective for load frequency control than the conventional controllers.