Maurício B. C. Salles

• Doctorate
• Professor (Assistant) at University of São Paulo

The need to reduce emissions in the oil and gas (O&G) sector is boosting studies aiming to integrate renewable energy sources (RES) and replace fossil fuel generation. Several studies address the frequency control in isolated grids. Still, there's a lack of studies focused on frequency support in O&G facilities, where high demand, space, and weight...

This study investigates the economic feasibility of Energy Storage Systems (ESS) in volatile market nodes within the Midcontinent Independent System Operator (MISO). As MISO transitions from a coal‐dominant energy mix to a more diverse composition of natural gas and renewables, new arbitrage opportunities for ESS emerge, particularly at nodes like...

This study compared from an Eco-efficiency point of view three electricity supply alternatives for oil and gas extraction, preliminary treatment, and distribution activities that occur on floating production, storage, and offloading platforms (FPSO) operated off the coast of Brazil. The performance of autonomous systems (AS), in which independent o...

The emerging HVDC technology has been used for long-distance power transmission, increasing flexibility to the power systems, handling asynchronous interconnections, crossing long-distance submarine cables, unusual loading, and generation profiles, and improving energy market relations. The HVDC converter transformers are designed based on system p...

As the trend towards the decentralization of grids continues, new typologies such as microgrids have gained popularity in recent years. Microgrids offer greater reliability as they can operate both connected to the main grid and in islanded mode. However, the transition to island mode can be even more challenging when a microgrid has a high penetra...

The promising area of offshore wind power has encouraged wind generation to supply Oil & Gas (O&G) facilities. A potential arrangement comprises a Water Injection System (WIS), as a method for oil recovery in reservoirs, connected to a wind turbine and a Battery Energy Storage System (BESS). However, the wind intermittency poses a challenge for an...

Many researchers and operators are assessing the impact of wind energy integration into the gas turbines based conventional power system due to the intermittent and variable nature. The flexibility characteristics of the gas turbines are vital to guarantee adequate performance at different levels of wind energy penetration to meet the demand of the...

Towards a future with more renewable energy, oil and gas (O&G) will still play a major role in the energy and mobility sectors. Therefore, scientists must also investigate ways to mitigate carbon emissions in O&G production. In this sense, a power hub with local generation can be employed in offshore production sites to allow the adoption of more e...

The main objective of this paper is to select the optimal configuration of a ship’s power system, considering the use of fuel cells and batteries, that would achieve the lowest CO2 emissions also taking into consideration the number of battery cycles. The ship analyzed in this work is a Platform Supply Vessel (PSV) used to support oil and gas offsh...

HVDC has been chosen as an economical and technical solution for power transmission through long distances, asynchronous interconnections and long submarine cables crossing. Despite DC transmission benefits to power systems, the converters non-linearity produces undesirable effects to the converter transformer in service, mainly listed in the techn...

The power system is going through a change in its very foundations. More and more power converters are being integrated into the electric grid to interface renewable energy resources and in high-voltage direct-current (HVDC) transmission systems. This article presents a discussion on the stability of power systems when HVDC transmission systems bas...

An emerging challenge of most electric utilities is to expand hosting capacity constraints and maximise the interconnection of distributed energy resources (DER). DERs have proliferated in distribution systems in most jurisdictions, and this proliferation has not occurred in an orderly fashion. Reports of degradation in power quality and operations...

The continuous increase of the distributed energy resources (DERs) penetration levels leads to voltage stability problems in the distribution system. One of the approaches for the mentioned emerging challenge is the proper placement of automatic voltage regulators (AVRs). This paper investigates the optimal placement and sizing of AVRs in a distrib...

The operation in energy arbitrage markets is an attractive possibility to energy storage systems developers and owners to justify an investment in this sector. The size and the point of connection to the grid can have significant impact on the net revenue in transmission and distribution systems. The decision to install an energy storage system can...

The original publication of this paper contains a mistake.

The main objective of this paper is to evaluate the use of floating wind turbines for isolated offshore systems. The energy analysis is a vital step at the initial phase of the project to define topologies that will be able to feed subsea systems, a water injection system is considered as a example. The first location that we decided to look in det...

The power system is going through changes from centralized synchronous generators to decentralized nonsynchronous generators based on renewable energy (RE). The operation of power systems with high penetration levels of RE poses a challenge to system operators due to their variability and changes in the power system’s physics. This chapter investig...

This article presents a novel empirical study for the estimation of the State-of-Charge (SOC) of the Panasonic 18650PF lithium-ion (Li-ion) cell using deep learning models and algorithms with adaptive learning rates. Specifically, we model a vehicle drive cycle designed for training neural networks. Our results suggest that the choice of the optimi...

This paper presents an alternative topology analysis for reactive power control in wind farms with wireless communication link integration. The co-simulation environment with telecommunication, machine control, and power system demonstrate in this analysis, that it can be an useful solution for planning the operation of modern power systems and the...

On offshore petroleum platforms, limited weight and space allowances currently restrain electricity generation to low-efficiency systems based on simple cycle gas turbines, which has hampered the efforts to radically abate the environmental impact produced. In this regard, the concept of power hub emerges as an interesting alternative for the centr...

Virtual power plant (VPP) interconnects distributed generation (DG) units, microgrids, and energy storage systems (ESSs) of an electrical power system. This paper presents a linear programming cost minimization model of VPP for the design and commitments of DG, ESS, and microgrid. Using a set of renewable energy resources, the proposed model create...

This article presents a novel empirical study for the estimation of the State of Charge (SOC) of a lithium-ion (Li-ion) battery which uses a deep learning model with three hidden layers. We model a series of ten vehicle drive cycles that were applied to a Panasonic 18650PF Li-ion cell. Our results show that the choice of the optimization algorithm...

Optimizing ship power systems with diesel generators such as the platform supply vessel (PSV) has become a pressing issue due to the emission of carbon dioxide. This paper investigates the optimal operation of diesel generators in marine power systems, particularly the PSV. The investigation is mainly focused on carbon dioxide emission and fuel con...

This article presents two Deep Forward Networks with two and four hidden layers, respectively, that model the drive cycle of a Panasonic 18650PF lithium-ion (Li-ion) battery at a given temperature using the K-fold cross-validation method, in order to estimate the State of Charge (SOC) of the cell. The drive cycle power profile is calculated for an...

Buried metal elements such as fences, pipelines, building rebar, and railway tracks are subject to electric potential rise due to current flowing through the ground. In fact, theremay be a potential transfer of substations to remote regions in which such safety risks are not generally expected. This work presents a calculation procedure for this po...

Distributed renewable generations such as photovoltaic units are electricity generators for installing close to the loads on the distribution system. In this paper, the dispatch function of a non-centralized Virtual Power Plant (VPP) with having a photovoltaic unit in each bus is considered to optimize. This dispatch function is assigned based on t...

Os descontos aplicados nas tarifas de distribuição e transmissão para as energias incentivadas podem ser considerados a primeira política pública de incentivo à expansão das energias renováveis no Brasil. Neste trabalho serão exploradas a efetividade deste subsídio, seu impacto no preço final ao consumidor e as propostas para sua desmobilização, tr...

The sun is a plenty and popular source of renewable energy. To transform solar energy into electricity it is necessary to use photovoltaic (PV) panels which in turn have flow efficiency and therefore do not provide maximum power. Maximum power depends on temperature and solar radiation. Changes in these environmental factors require an algorithm to...

As referred to the safety of people, the metallic fence of a substation is an object of special care. The substation fence is subject to a potential rise as well as to direct contact with people and animals, which is a hazardous situation. The connection of the fence to the substations grounding grid, the sectioning of the fence through isolated pa...

This paper presents a new concept for finding saddle-node bifurcation (SNB) points in voltage stability analysis of power systems by applying the extended functional method (EFM). This method enables the finding of the SNB point of power systems by directly calculating the extreme values of a nonsmooth variational functional, which is obtained in i...

This paper presents a novel methodology for frequency control of a microgrid through doubly fed induction generator (DFIG) employing battery energy storage system (BESS) and droop control. The proposed microgrid frequency control is the result of the active power injection from the droop control implemented in the grid side converter (GSC) of the D...

This paper presents a new methodology for primary frequency response (PFR) in a microgrid through the finite control set-model predictive control (FCS-MPC) plus droop control applied to the grid side converter (GSC) of a doubly fed induction generator (DFIG). In this configuration, the rotor side converter (RSC) is responsible for maintaining wind...

This paper investigates the impact of high levels of penetration of wind power generation in the problem of transient stability of power systems. The investigation takes into account the stability issues related to the disconnection of wind power plants due to violation of voltage limits defined by the low-voltage ride-through curve. Different leve...

Only qualitative aspects on the skin effect in conductors are properly described in the technical literature on power systems applications. Although the qualitative analysis is an important issue, it is not sufficient for a full approach and proper understanding of this electromagnetic phenomenon in power systems, more specifically in power transmi...

This paper aims at investigating the CO2 emission, the fuel consumption, the energy contribution and the time connection of each generator in standards routes of a Platform Supply Vessel (PSV) using direct-current (DC) distribution system. Since the majority of the PSVs work with AC distribution grids, in this paper we trace a comparison between bo...

Greenhouse gas emissions are one of the most critical worldwide concerns, and multiple efforts are being proposed to reduce these emissions. Shipping represents around 2% of global CO2 emissions. Since ship power systems have a high dependence on fossil fuels, hybrid systems using diesel generators and batteries are becoming an interesting solution...

This work proposes the use of the automatic Short Message Service (SMS) of a Global System for Mobile Communication (GSM) network to transmit the control information to a Doubly Fed Induction Generator (DFIG) of a wind turbine, according to the Smart Grid (SG) concept. In the proposed strategy, the Control Center (CC) can remotely transmit the requ...

The reduction of CO 2 emissions from vessels gain relevance after European regulations became more rigorous, monitoring and checking CO 2 emissions in European Union (EU) ports. Based on these concerns, this work aims to study strategies to include lithium-ion batteries in a Platform Supply Vessel (PSV) diesel-electric system. Regarding the differe...

This work aims at analyzing the use of the advanced energy storage systems to maintain the operation of the diesel generators closer to their rated power, when the diesel generators operate at this point they save diesel and reduce the CO 2 emission. In this work, we compare the diesel consumption, frequency and voltage levels in the most critical...

The share of photovoltaic (PV) farms is increasing in the energy mix as power systems move away from conventional carbon-emitting sources. PV farms are equipped with an expensive power converter, which is, most of the time, used well bellow its rated capacity. This has led to proposals to use it to provide reactive power support to the grid. In thi...

This work aims at analyzing if the connection of a battery system would have a positive impact, maintaining the voltage and frequency inside the limits regulated by the standard PN-IEC-60092-101. On our analysis the generator operation is chosen to follow the load mean and its variations are absorbed or fed by the battery systems. By doing that, we...

The aim of this article is to describe the concept of a Living Lab to be implemented at the University of Campinas through a partnership between UNICAMP and CPFL (local Utility Distribution Company). This project was recently submitted to a strategic and priority call from the Brazilian Regulatory Agency (National Electric Energy Agency—ANEEL, acro...

Reactive power support by photovoltaic farms has been under discussion in several countries. This kind of operation has been proposed because the photovoltaic farm converter is an expensive asset that is often used well below its power rating. This paper proposes a methodology for estimating the reactive power support capability and the associated...

The objective of this work is to study and evaluate the impacts and challenges of the insertion of distributed generation (DG) linked to photovoltaic (PV) technology in Brazil and to verify its impact in a residence energy bill. The Brazilian panorama of the generation PV, the obstacles for its implantation, as well as its technical and regulatory...

This paper proposes a direct power control algorithm, operating at variable speed and robust to parameter variations for a Doubly Fed Induction Generator-based wind power generation system. This scheme uses two control loops, one for decoupled stator flux and another one for Deadbeat direct power controller. The control algorithm estimates the volt...

This paper proposes a direct power control algorithm, operating at variable speed and robust to parameter variations for a Doubly Fed Induction Generator-based wind power generation system. This scheme uses two control loops, one for decoupled stator flux and another one for Deadbeat direct power controller. The control algorithm estimates the volt...

In this paper, a novel direct power control algorithm for a Doubly Fed Induction Generator-based wind system, robust to the machine parameters variations, is projected. The proposed scheme employs two loops designed using the discretized equations of the generator to obtain a high performance of the controller. Also, the rotor voltage vector is com...

The volatility of electricity prices is attracting interest in the opportunity of providing net revenue by energy arbitrage. We analyzed the potential revenue of a generic Energy Storage System (ESS) in 7395 different locations within the electricity markets of Pennsylvania-New Jersey-Maryland interconnection (PJM), the largest U.S. regional transm...

The environmental footprint of ships is on the highlights of the maritime industry to make it moves to a greener future. Recently, European regulation starts to be more severe with the monitoring, reporting and verification of CO 2 emissions from large ships using that are using EU ports. The use of fossil fuels to generate power to ships is in che...

More PV systems have been connected to the electrical network each year. As the number of PV systems increases, some issues affecting grid operations have been identified. This paper studied the impacts related to changes in solar irradiance on a distribution/sub-transmission network, considering variations due to moving clouds and daily cycles. Us...

Industrial loads are usually composed of large induction motors (IM). These motors present a critical behavior under some circumstances, e.g. during starting and faults in the system. Currently, induction generator-based wind turbines are also connected to distribution systems. Essentially, these generators present the same behavior of large IM and...

Modern wind turbines operate with variable speed and most of them are based on doubly fed induction generators (DFIG), with a back-to-back power converter. During voltage dips, the stator terminals can cause overcurrents in the rotor windings, which could threaten the converter integrity. The use of crowbar systems is the most common technique to a...

This short communication presents an analytical method for assessing the stability of doubly fed induction generators. The method is based on the concept of critical rotor speed and it provides insights into the influence of the voltage applied to the rotor windings on the generator stability margin. This information can be useful to plan the conve...

In 2012, Brazil had a proved reserve of 15.3 billions of BOE (barrel of oil equivalent). The offshore reserve corresponds to more 94% of this amount. Petrobras, the Brazilian E&P company, leads the offshore production in ultra-deep water (deeper than 1500 m of water depth) worldwide. The current offshore production in ultra-deep waters deploys a Fl...

This paper presents a methodology of controlling the power injected into system by wind generators and the use of Optimal Reactive Power Flow (ORPF). The methodology used two stages: in the first one scheme for Doubly-Fed Induction Generator (DFIG) is realized to control the active and reactive powers, in the second stage, the ORPF based in the Mod...

Recently, the interest in the use of wind energy has increased considerably in the world's energy markets. In the same way there is a visibly tendency in distributed generation due to market deregulation, technological advances, governmental incentives and environment impact concerns. Considering these facts, it is important to understand the diffe...

The diversification of the energy supply associated with the increasing interest in clean energy sources make most of the countries seek new technologies that could meet these needs. In this way, there has been a large increase in the number of wind turbines connected to the network. Considering the technological development and consequent increase...

Nowadays, wind power is one of the most used renewable energy sources due to its economic possibilities. Consequently, penetration of wind turbines in electrical power systems has increased and they may influence overall power system behavior. It is therefore important to study the performance of wind turbines in electrical power systems and their...

At the present time, the wind power is one of the most accepted renewable energy sources and its penetration in electrical power systems has increased considerably. The high penetration of wind power influences the electrical power system performance. In this paper the behavior of a transmission system with a high level of wind energy penetration u...

A review of the latest publications and updates of international grid codes shows that the future trend regarding frequency stability support by wind turbines (WTs) during disturbances will be to impose stringent requirements. Nevertheless, system dynamic response depends in a complex manner on wind power network development and power system charac...

The connection of wind farms to the electrical power system has increased very fast in the last years requiring the ability of the wind turbines to assist network during voltage sags. Most of the modern wind turbines are based on doubly fed induction generator with a back-to-back power converter connecting the rotor windings to the grid. One limita...

This paper presents a discussion about the large disturbance instability phenomenon of grid-connected doubly fed induction generators. The behavior of squirrel cage induction generator (SCIG) on large disturbance stability depends basically on the ability of the blade pitch angle control and the injection of reactive power during contingency on the...