Danilo Iglesias Brandao

Danilo Iglesias Brandao
Federal University of Minas Gerais | UFMG · Departamento de Engenharia Elétrica (DEE)

Doctor

About

124
Publications
30,312
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Introduction
Danilo I. Brandao received the Dr. degree in Electrical Engineering from University of Campinas, Brazil, in 2015. He is currently assistant professor at Federal University of Minas Gerais with the Graduate Program in Electrical Engineering. His main research interests are power quality in off-shore platforms, control of grid-tied converters, microgrids.

Publications

Publications (124)
Article
Multifunctional inverters play an important role in electrical grids due to their capability to provide active power conversion from photovoltaic (PV) systems, as well as by concomitantly offering ancillary services that provide grid support and power quality improvement. Although control strategies for such inverters have been extensively explored...
Chapter
The microgrid energy management usually is based on hierarchical architecture, adapted from the ISA‐95 standard, which consists of three control levels: i) the primary control level is responsible for the local and autonomous control of the power converters and ensures power sharing, DC voltage regulation and stability; ii) the secondary control le...
Article
Full-text available
This paper proposes a new solution for multiple grid–forming converters to achieve the four main objectives required: (i) accurate output active and reactive power control in grid-connected mode; (ii) seamless transitioning from grid–connected to islanded mode; (iii) autonomous power sharing among dispersed converters; and (iv) smooth reconnection...
Article
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The current state of the art shows that unbalance and distortion on the voltage waveforms at the terminals of a grid-connected inverter disturb its output currents. This paper compares AC linear current regulators for three-phase three-wire voltage source converters with three different reference frames, namely: (1) natural (abc), (2) orthogonal st...
Article
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This paper proposes a modified version of the power-based control (MPBC) applied to microgrids (µGs) with multiple points of connection (i.e., utility grid itself or any other neighboring µG). Using the MPBC, single-phase distributed energy resources (DERs) arbitrarily connected between the phases share the amounts of balanced power, while the unba...
Article
Full-text available
Beyond the impacting presence of non-linear loads, low-voltage microgrids also experience low energy efficiency and resonance phenomena when operating interconnected to a distribution grid that suffers from distorted voltages. This paper proposes a model-free control strategy capable of coordinating inverters existing within a dispatchable microgri...
Article
Full-text available
Although the literature extensively covers the development of battery chargers control strategies, a comparison of these strategies remains a literary gap. The inherent conditions (i.e., State of Health and State of Charge) of each unit in the Battery Energy Storage Systems directly influence the charger control techniques for extending battery lif...
Conference Paper
Full-text available
In this paper, a power management strategy is proposed for enhancing the benefits of energy storage systems to wind powered offshore Oil and Gas platforms. Different functionalities of the converter, such as following a charging schedule from an upper layer control and active power filtering are dynamically assessed, and the converter capacity is o...
Article
Full-text available
Virtual Oscillator Control (VOC) is a promising technique that allows several inverters connected to a microgrid to naturally synchronize, without communication. However, the selection of the VOC parameters often require iterative or optimization procedures that render its practical use not straightforward. In this paper, this problem is overcome w...
Article
Full-text available
Most of the distributed control strategies for grid-connected power converters are droop-based approaches composed of converters driven in voltage-control mode, based on local and shared data with adjacent units. They are usually combined with consensus protocols to deal with the trade-off between power sharing accuracy and voltage/frequency regula...
Article
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This paper proposes a preliminary design tool for active power filters’ (APFs) solutions to be applied in offshore oil and gas platforms, where power quality indices are typically low, and reactive power compensation and current harmonic mitigation are often desired. The proposed approach considers that APF selection and rating is a trade-off betwe...
Article
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In recent years, the global energy industry has been experiencing a remarkable growth of distributed generators, which are mostly based on power electronics grid interfaces. This phenomenon has led to the development of many different techniques to allow the parallel operation of these dispersed sources without communication links. Most of the prop...
Article
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Traditional airplanes with fixed frequency and unipolar DC bus (270 V) commonly use 12-pulse passive rectifiers. The increase of power demand and the concern with aircraft efficiency boost the electrification of airplanes using variable frequency(360-800 Hz) and bipolar DC buses (± 270 V). Thus, this paper analyses the 12-pulse passive rectifiers i...
Article
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This paper analyses the frequency stability of ac grids in the presence of non-dispatchable generation and stochastic loads. Its main goal is to evaluate conditions in which the system is robust to large, persistent active power disturbances without recurring to time-domain simulations. Considering the ongoing energy transition to more renewable so...
Article
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Taking into account the growth of distributed generation systems in low-voltage networks, it is important to fully exploit the energy resources and their embedded power converter. Thus, this paper proposes an optimization strategy for controlling the multifunctional inverter endowed in the distributed generator. Such approach allows maximum exploit...
Article
The dispatchable microgrids can support the operations of the electrical distribution networks acting as controllable active agents by interoperability with the Microgrid Operator. Few published studies have focused on the combination of different ancillary services provided by the same microgrid. Other recent works have addressed single and multip...
Article
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This paper proposes a fully decentralized control approach, based on AC bus signaling, to integrate the operation of voltage- and current-controlled converters that exist in an isolated low-voltage microgrid, so they may be fully steered under grid-feeding, grid-supporting, and grid-forming control principles. The proposed strategy, devised by clas...
Article
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A crucial converter for the islanded operation of AC microgrids is the grid-forming converter. This central converter supplies electrical loads, and assures the distributed generators operation, since the malfunctioning of grid-forming converter can jeopardize the whole microgrid. This paper proposes a bidirectional grid-forming converter with a fa...
Conference Paper
Full-text available
This paper addresses the matter of active and reactive power sharing among distributed inverters in low-voltage microgrids, particularly highlighting the peculiarities of two strategies of coordinated control based on a master/slave architecture, namely Power-and Current-Based Control, in comparison to the classic droop control approach. It is demo...
Article
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Considering the high penetration of distributed generators in low-voltage grids, establishing a coordinated operation of their grid-tied inverters has become imperative to move towards the implementation of smart grids. Yet, knowing that mitigation of power quality issues such as reactive power, current unbalance and harmonics is of importance with...
Article
The existence of unbalanced loads and high penetration of single-phase distributed energy resources connected unevenly throughout the phases of a microgrid causes unbalanced currents through the microgrid’s point of common coupling and then degradation of power factor. This paper proposes a multi-objective optimization model applied to optimization...
Conference Paper
Full-text available
This article presents an approach based on Grey Relational Analysis to analyze and classify potential disturbing loads in microgrids, taking into account power factor, unbalance, harmonics and reactive power. By computational simulations, we analyze a set of loads with different characteristics using load performance factors and the Conservative Po...
Conference Paper
Battery banks can be used to reduce energy costs for customers under time-of-use tariffs, such as the white tariff for low-voltage customers in Brazil. This paper compares the life span between lithium-ion and lead-acid battery banks when used to reduce electricity bills. Battery banks are used in conjunction with a photovoltaic plant in the contex...
Conference Paper
This paper presents a cost-benefit analysis of investment on installation of power quality conditioners. For this, it is considered the economic feasibility indices, such as net present value (NPV), internal rate of return (IRR), simple payback and equity payback. To evaluate the proposed method, two case studies of industrial consumers are impleme...
Technical Report
Full-text available
Executive summary The objective of this work has been to present a critical assessment of two trends which are largely influencing the decisions and the evolutionary process of power grids: the micro and MEGA trends. These trends are both aimed at enabling very high penetration of renewable energy sources in the electric power system, from two pers...
Article
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A hybrid AC/DC microgrid combines the benefits of AC and DC power systems. It provides high efficiency and is compatible with conventional AC distribution network. This paper proposes a centralized energy management approach to perform coordinated control on a hybrid AC/DC microgrid as a single-controllable entity. The central controller relies on...
Article
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This paper proposes a new representation of electrical circuit quantities based on three-phase dimensional space, in contrast to the conventional two-dimensional representation. It contributes to an alternative mathematical approach to display the voltage and current waveforms in three-dimensional frame, in which an unbalance displacement angle bec...
Conference Paper
Full-text available
The presence of distributed generation systems spread over low-voltage electrical networks is boosting the development of control methodologies aiming at coordinating and cooperatively managing the existing smart inverters. Although low-bandwidth data transmission links are constantly described to be required for a considerable number of centralize...
Presentation
Full-text available
Pervasive proliferation of non-linear and time-varying loads and distributed generation make the power system operate under conditions that are substantially different from traditional sinusoidal ones. This calls for advanced compensation equipment and coordinated operation to improve power quality and efficient use of distributed resources. Power...
Conference Paper
Full-text available
AC power conditioners in electric power systems have been extensively explored in the literature based on approaches mainly focused on single- and three-phase wiring topologies, remaining a significant gap in regard to applications suitable for two-phase three-wire circuitry. Therefore, this work demonstrates that the Conservative Power Theory can...
Conference Paper
Full-text available
Without proper coordination, power conditioners within microgrids are prone to suffer from resonance phenomena due to the complex and dynamic interactions among the main grid, nonlinear loads and distributed converters. In addition to the detriment of grid-connected devices and loads, harmonic voltage resonances may also lead to microgrid instabili...
Conference Paper
Full-text available
This paper proposes a power control loop strategy for Voltage-Source Inverters (VSIs), based on the use of abc frame PI controllers. Its physical behaviour and mathematical model are presented in detail and the inverter output impedance is derived to analyze the obtained disturbance rejection performance. The results show that the proposed scheme i...
Article
Full-text available
This paper proposes an approach to obtain harmonic compensation and power control by exploiting the electronic power converters deployed in low-voltage microgrids. By the proposed approach, distributed harmonic current compensation is achieved without interfering with the converter's power exchange involved in interfacing the local energy resources...
Article
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The presence of single-phase distributed generators unevenly injecting active power in three-phase microgrids may create undesired upstream current unbalance. Consequently, voltage asymmetry and even active power curtailment may occur in such networks with negative economic impact. Thus, this paper proposes an optimal multiobjective approach to reg...
Article
Full-text available
This paper investigates power quality issues in a wind-powered offshore oil and gas platform operating in island mode. Topics of interest are the negative effects that load and wind power variability have on the electrical system frequency and voltage; and how those influence the gas turbine operation. The authors discuss how smart load management...
Article
Full-text available
This paper explores the coordinated strategy named Power-Based Control to properly coordinate grid-tied single-and three-phase distributed energy resources in three-phase three-wire microgrids. By means of a narrowband, low data rate communication, such strategy accommodates current-and voltage-controlled distributed inverters providing proportiona...
Conference Paper
Hybrid electric systems have gained relevance in off-road applications because it allows the internal combustion engine to operate near its maximum efficiency region, ensuring reduction of gas emissions and fuel consumption. This paper presents a comprehensive approach for electrification projects applied to this sort of equipment, including the te...
Conference Paper
Full-text available
Power-based control has proven to be an effective and robust way for having a centralized control scheme in a microgrid. The scheme has a minimal communication requirement, which enables the distributed energy resources (DERs) in the system to share the load proportionally according to their capability. This paper proposes a modification of the con...
Article
Full-text available
This paper presents an active instrumentation approach for distributed generation systems. The basic inherent tasks of such active instrumentation are (1) measurement, (2) control, (3) operation, (4) monitoring, and (5) correction of undesirable power quality issues in response to power parameters deviations, with the particularity of presenting th...
Article
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Electric grid codes are expected to change in near future to accommodate an increased number of distributed generation units in the distribution power system without impairing its power quality. It is desired that the generators remain connected during voltage sags and provide ancillary services, such as voltage and reactive power control, ensuring...
Article
This paper proposes the third generation of the Power-Based Control, that is, an approach to effectively coordinate the operation of single-and three-phase inverter-interfaced distributed energy resources that can be arbitrarily connected among the phases of three-phase four-wire low-voltage microgrids. The aim of the approach is to precisely regul...
Conference Paper
Full-text available
This study considers the connection of solar power plants and an energy storage system based in a battery bank aiming at reducing the use of existing diesel generators. An optimization algorithm is used to evaluate the management of the energy resources, considering the best operating solution that minimizes the costs of operating the system in sev...
Article
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In this paper, the advantages of an enhanced boost converter are utilized in a photovoltaic based energy system, to improve the efficiency and the output/input voltage gain. Besides, this circuit topology allows lower input current ripple than conventional single-switch DC/DC boost converters, increasing photovoltaic energy yield. The floating inte...
Article
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This paper proposes a new multifunctional converter based on a series voltage compensator applied to centralized AC microgrids. Besides the basic functionalities required for a centralized converter in microgrids, such as grid-supporting and grid-forming voltage support and smooth transition from operating modes, the proposed converter can change i...
Article
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The current context of microgrids shows a considerable and unprecedented increase in distributed generation. A microgrid is defined as a network of electricity users composed of distributed generators, loads and storage elements able to operate as a single entity connected or isolated from the main grid. However, the microgrids have usually low sho...
Conference Paper
Full-text available
Current grid requirements tend to change in near future to accommodate more distributed generation units in the distribution power system without impairing its power quality. It is expected that the generators remain connected during voltage sags and provide ancillary services, such as reactive power injection, ensuring the operational stability of...