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The demand profile knowledge is vital for a wide variety of power systems studies. Furthermore, meaningful information may be obtained regarding optimization and maximization decision-making strategies that may help a wide variety of consumers optimize their facilities usage, redefine low priorities equipment operating hours, as well as promote actions seeking production increase. With the spread...
Harmonics and Quality of Power (ICHQP 2016) we welcome all delegates and visitors to Belo Horizonte. The International Conference on Harmonics and Quality of Power is one of the premier international conferences in the field and aims to provide a forum for electrical engineers and scientists to present their work and share information in this area of growing interest and importance in the Electric...
The focus of this work is to present the state-of-the-art of Power Electronics (PE) devices and applications in power systems in the context of renewables sources, Power Quality (PQ) and Smart Grids (SG). Different converter topologies and technologies are introduced. A general framework of PE systems and the main characteristics of devices are shown together with the corresponding applications involving...
The introduction of distributed generation has affected power systems. The hosting capacity is used to determine the amount of generation that can be connected to the system without deteriorating its performance. This paper proposes the analysis of the hosting capacity regarding the inclusion of wind turbines considering different background distortions. A case study is performed on a Brazilian university...
This article presents the use of two different computational platforms (RTDS & MATLAB/Simulink SimPowerSystems) as tools for the analysis and comparison of harmonics, power quality (PQ) and the dynamic response of a HVDC system. The electric grid used in this study is a modified CIGRÉ HVDC Benchmark System model. The paper shows that the applications of these tools allow the comparison of results...
This study aims to evaluate the performance (accuracy assessment) of current transformers in the presence of harmonic distortion. Using the software ATP-Alternative Transients Program, an equivalent CT circuit model was validated and the simulation results were compared with tests performed in prototypes. From the results obtained it can be concluded that the frequency response of the CT has variations...
Power electronics converters coupled to the network increase every day with the different applications such as photovoltaic systems for example. The objective of this study was to observe the impact of non-sinusoidal voltages on the harmonic generation of power electronic converters. . The present scenario in which both load and source inject harmonic components on the grid requires much research...
The growing use of nonlinear loads in commercial, residential and industrial sector has been distorting the currents and voltage waves of the power network. These distortions are known as harmonic distortions, and its presence can cause serious problems to equipment linked to polluted sources. One well known solution to mitigate this issue is the use of passive filter. This paper presents many aspects...
As modern society electrical energy consumption requirements increase, a growing need for more efficient and lower costs power electronics processing devices is featured. Even though this kind of devices have high efficiency, it creates a problem by injecting harmonic currents. This paper aims to address the harmonic distortion impact caused by non-linear loads and renewable generation on a typical...
Harmonic impedance is an important parameter for electrical power system analyses. This parameter can be applied in some important application such as island and resonance detection. This work presents an impedance estimation technique implemented in real time. The method uses a small current disturbance injection in the harmonic frequency and uses Sliding Window Recursive Discrete Fourier Transform...
The paper address the concept and application of hosting capacity study methodologies to harmonics caused by photovoltaic panels (PV) connected to low-voltage (LV) at an university campus. The analysis of the insertion of new distributed generation technologies, such as photovoltaic panels in the distribution system of this campus was carried out initially via analytical processes, and later by computer...
This paper presents the use of a computational system, MATLAB/Simulink SimPowerSystem, as a tool for analysis of power quality (PQ) including distributed generation (DG) connected to smart girds. An electrical circuit model for DG, recloser, photovoltaic system-PV and loads located downstream and upstream from recloser is proposed in this study. The paper shows that this system allows to understand...
One of the most challenging proposals about the smart grid concept is the deployment of features that enable a power grid to reconfigure itself, isolating defects and recovering through alternative available routes after disturbances. This ability is known as Self-Healing, a concept most widespread in distribution power systems. In transmission power systems, however, there is a substantially lower...
The electrical infrastructure of the future will be much more complex than today. It will integrate traditional and sustainable energy sources, existing and new distribution networks, customers with quite different consumption patterns and a variety of smart control systems. At this moment, however, there is no comprehensive engineering model that can cope with the higher level of complexity of future...
The increasing penetration of renewable/distributed sources with non-linear characteristics demands a clear methodology for determining the amount of generation which can be connected to the system without deteriorating the performance (the “hosting capacity”). This paper proposes a methodology for determining the hosting capacity regarding harmonic distortions. To exemplify an application of the...
Optimal filter design considering the system uncertain behavior has been a topic of research for a long time. Due to the lower cost, passive filters are still considered the most common solution for harmonic distortion problems. This paper presents a heuristic methodology for the placement and sizing of passive filters through ranking solutions based on the standard quality index THD (Total Harmonic...
This paper proposes a novel DC-side controller for grid-connected voltage source converters during asymmetrical faults. The controller is based on a modified second order generalized integrator (SOGI). The main objective is to mitigate the second order harmonic voltage oscillation on DC link as well as the positive sequence third-order harmonic current injection into the AC grid, due to negative sequence...
This paper presents a diagnosis methodology for power system disturbances, in real time, based on alarms and sequences of events (SOE). The Disturbance Diagnosis System for Real Time Operation was created to assist the operator to understand causes of disturbances, through actuated equipment protections. Its development was based on actions performed by operators during disturbances and it is, therefore,...
This paper presents the modeling and simulation of a subsynchronous resonance using Simscape in a multi-physical environment. It is shown that through this new modeling approach it is possible to visualize and better understand how the mechanical and electrical systems interact with each other during a subsynchronous resonance. The use of multi-physical domain simulation allows engineers and designers...
This paper makes suggestions, based on the current grid codes, for different requirements that may be adopted by the transmission system regarding the connection of large wind and photovoltaic power plants to medium and high voltage networks. The main purpose is to present a proposal which harmonizes the requirements for renewable energy sources with electronic interface. Taking into consideration...
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