scholarly journals High Accuracy Power Quality Evaluation under a Colored Noisy Condition by Filter Bank ESPRIT

Electronics ◽  
2019 ◽  
Vol 8 (11) ◽  
pp. 1259 ◽  
Author(s):  
Elaine Santos ◽  
Mahdi Khosravy ◽  
Marcelo A. A. Lima ◽  
Augusto S. Cerqueira ◽  
Carlos A. Duque ◽  
...  
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Filter Bank ◽  
Colored Noise ◽  
Renewable Energy Sources ◽  
Quality Parameters ◽  
Computational Effort ◽  
Parameters Estimation ◽  
Quality Analysis ◽  
High Level

Due to the highly increasing integration of renewable energy sources with the power grid and their fluctuations, besides the recent growth of new power electronics equipment, the noise in power systems has become colored. The colored noise affects the methodologies for power quality parameters’ estimation, such as harmonic and interharmonic components. Estimation of signal parameters via rotational invariance techniques (ESPRIT) as a parametric technique with high resolution has proven its efficiency in the estimation of power signal components’ frequencies, amplitudes, and phases for quality analysis, under the assumption of white Gaussian noise. Since ESPRIT suffers from high computational effort, filter bank ESPRIT (FB-ESPRIT) was suggested for mitigation of the complexity. This manuscript suggests FB-ESPRIT as well for accurate and robust estimation of power signal components’ parameters in the presence of the colored noise. Even though the parametric techniques depend on the Gaussianity of contaminating noise to perform properly, FB-ESPRIT performs well in colored noise. The FB-ESPRIT superiority compared with the conventional ESPRIT and MUSIC techniques was demonstrated through many simulations runs on synthetic power signals with multiple harmonics, interharmonics, and subharmonic components in the presence of noises of different colors and different SNR levels. FB-ESPRIT had a significant efficiency superiority in power quality analysis with a wide gap distance from the other estimators, especially under the high level of colored noise.

Improvement of Power Quality for Microgrid using Fuzzy Based UPQC Controller

2015 ◽  
Vol 4 (2) ◽  
pp. 37
Author(s):  
Abdul Rasheed ◽  
G. Keshava Rao
Keyword(s):  
Fuzzy Logic ◽  
Power Systems ◽  
Power Quality ◽  
Fuzzy Logic Controller ◽  
Control Strategies ◽  
Renewable Energy Sources ◽  
Distributed Energy ◽  
Micro Grid ◽  
Hybrid Filters ◽  
Micro Grids

<p>Generally, the power systems are mainly effected by the continuous changes in operational requirement and increasing amount of distributed energy systems. This paper proposes a new concept of power-control strategies for a micro grid generation system for better transfer of power. The micro grids are obtained with the general renewable energy sources and this concept provides the maximum utilization of power at environmental free conditions with low losses; then the system efficiency is also improved. This paper proposes a single stage converter based micro grid to reduce the number of converters in an individual ac or dc grid. The proposed micro grid concept can work in both stand-alone mode and also in grid interfaced mode. The distortions that occur in power system due to changes in load or because of usage of non-linear loads, can be eliminated by using control strategies designed for shunt active hybrid filters such as series and shunt converters. A conventional Proportional Integral (PI) and Fuzzy Logic Controllers are used for power quality enhancement by reducing the distortions in the output power. The simulation results are compared among the two control strategies, that fuzzy logic controller and pi controller.</p>

Power Quality Analysis of a Grid-connected Solar/Wind/Hydrogen Energy Hybrid Generation System

2018 ◽  
Vol 9 (1) ◽  
pp. 377
Author(s):  
Sujit Kumar Bhuyan ◽  
Prakash Kumar Hota ◽  
Bhagabat Panda
Keyword(s):  
Power Quality ◽  
Power Transmission ◽  
Renewable Energy Sources ◽  
Clean Energy ◽  
Quality Analysis ◽  
Hydrogen Energy ◽  
Generation System ◽  
Hybrid Generation ◽  
Pv System ◽  
Wind Energy Conversion

A grid connected hybrid generation system (HGS) consisting of wind energy conversion System (WECS)/Photo voltaic (PV) System/solid oxide fuel cell (SOFC) is designed and simulated by using Matlab/Simulink. SOFC is the replacement of battery, attached to produce the clean energy when these renewable energy sources are unable to produce required amount of electric power. A controller is used to regulate the flow of H<sub>2 </sub>through the valveto the SOFC and the rest amount of H<sub>2 </sub>is stored in storage tank. Also, an operational control strategy (OCS) is developed to utilize maximum amount of power of PV to the required load and rest amount of power is coming from wind to fulfill the load demand. Hence, the electrolyzer is supplied by the wind power to convert the water in to H<sub>2</sub> and oxygen. Also the power quality factor (PQF) analysis is exercised to measure the quality of power transmission.

scholarly journals Power Quality Investigation of Distribution Networks Embedded Wind Turbines

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
A. Elsherif ◽  
T. Fetouh ◽  
H. Shaaban
Keyword(s):  
Power Systems ◽  
Wind Energy ◽  
Electric Power ◽  
Power Quality ◽  
Wind Turbines ◽  
Distribution System ◽  
Renewable Energy Sources ◽  
Distribution Networks ◽  
Small Scale ◽  
Distributed Resources

In recent years a multitude of events have created a new environment for the electric power infrastructure. The presence of small-scale generation near load spots is becoming common especially with the advent of renewable energy sources such as wind power energy. This type of generation is known as distributed generation (DG). The expansion of the distributed generators- (DGs-) based wind energy raises constraints on the distribution networks operation and power quality issues: voltage sag, voltage swell, voltage interruption, harmonic contents, flickering, frequency deviation, unbalance, and so forth. Consequently, the public distribution network conception and connection studies evolve in order to keep the distribution system operating in optimal conditions. In this paper, a comprehensive power quality investigation of a distribution system with embedded wind turbines has been carried out. This investigation is carried out in a comparison aspect between the conventional synchronous generators, as DGs are widely in use at present, and the different wind turbines technologies, which represent the foresightedness of the DGs. The obtained results are discussed with the IEC 61400-21 standard for testing and assessing power quality characteristics of grid-connected wind energy and the IEEE 1547-2003 standard for interconnecting distributed resources with electric power systems.

Techniques and methodologies for power quality analysis and disturbances classification in power systems: a review

2011 ◽  
Vol 5 (4) ◽  
pp. 519 ◽  
Author(s):  
D. Granados-Lieberman ◽  
R.J. Romero-Troncoso ◽  
R.A. Osornio-Rios ◽  
A. Garcia-Perez ◽  
E. Cabal-Yepez
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Quality Analysis ◽  
Power Quality Analysis

scholarly journals A SIMPLE PATTERN RECOGNITION-BASED METHOD FOR POWER QUALITY DISTURBANCE DETECTION

2021 ◽  
Vol 5 (3) ◽  
pp. 1-10
Author(s):  
Robson Rosserrani De Lima ◽  
Danton Diego Ferreira ◽  
José Manoel de Seixas ◽  
Leonardo Silveira Paiva
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Low Complexity ◽  
Mean Value ◽  
Computational Effort ◽  
Detection Rates ◽  
Detection Algorithms ◽  
Power Quality Disturbance ◽  
Simple Detection ◽  
Disturbance Detection

Voltage disturbances are the most frequent cause of a large range of disruption in industrial, commercial, and residential power supply systems. These disturbances are often referred to as power quality problems and affect the Power Systems causing substantial losses. To avoid the storage of a large amount of data, the first task in monitoring the power quality is the realtime detection of disturbances, which must be performed by an accurate and low-complexity system. This paper proposes a low-complexity system for power quality disturbance detection. The method makes innovative use of simple features extracted from reduced segments of the monitored voltage waveform. The extract features (the mean value, variance, energy, and the maximum and minimum values of the filtered voltage signals) require low computational effort and allow a considerable dimensional reduction of the signals, leading to simple detection algorithms. The proposed method achieves high detection rates on both simulated and real signals.

scholarly journals Power Quality Improvement in HRES Grid Connected System with FOPID Based Atom Search Optimization Technique

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5812
Author(s):  
Ch. Rami Reddy ◽  
B. Srikanth Goud ◽  
Flah Aymen ◽  
Gundala Srinivasa Rao ◽  
Edson C. Bortoni
Keyword(s):  
Power Systems ◽  
Power Quality ◽  
Reactive Power ◽  
Renewable Energy Sources ◽  
Optimization Technique ◽  
Harmonic Distortion ◽  
Reducing Power ◽  
Search Optimization ◽  
Power Quality Improvement ◽  
Power Quality Conditioner

An intelligent control strategy is proposed in this paper which suggests the Optimum Power Quality Enhancement (OPQE) of grid-connected hybrid power systems with solar photovoltaic, wind turbines, and battery storage. Unified Power Quality Conditioner with Active and Reactive power (UPQC-PQ) is designed with Atom Search Optimization (ASO) based Fractional-order Proportional Integral Derivative (FOPID) controller in the proposed Hybrid Renewable Energy Sources (HRES) system. The main aim is to regulate voltage while reducing power loss and reducing Total Harmonic Distortion (THD). UPQC-PQ is used to mitigate the Power Quality (PQ) problems such as sag, swell, interruptions, real power, reactive power and THD reductions related to voltage /current by using ASO based FOPID controller. The developed technique is demonstrated in various modes: simultaneous to improve PQ reinforcement and RES power injection, PRES > 0, PRES = 0. The results are then compared to those obtained using previous literature methods such as PI controller, GSA, BBO, GWO, ESA, RFA, and GA and found the proposed approach is efficient. The MATLAB/Simulink work framework is used to create the model.

Renewable energy development in Southeast Asia

2019 ◽  
Vol 1 (2) ◽  
pp. 52-62
Author(s):  
Yu. V. Vasil’ev ◽  
I. L. Ozernykh
Keyword(s):  
Renewable Energy ◽  
Power Systems ◽  
Southeast Asia ◽  
Renewable Energy Sources ◽  
Green Energy ◽  
Photovoltaic Energy ◽  
The Future ◽  
Specialized Equipment ◽  
High Level ◽  
Virtual Synchronous Machine

Subject of study: renewable energy, including photovoltaic energy. Goals: to present the main topics of the ACEPT conference, also formulated the topical issues of renewable energy and methods for their solution.Introduction: from October 31 to November 2, 2018, a conference on topical issues of green energy in Southeast Asia was held in Singapore. This event was viewed as part of the Singapore Energy Week. During the event, a dialogue was held between the leaders of regional renewable energy, equipment manufacturers, developers, businessmen, and civil servants in order to work out strategies for the development of green energy, which was supposed to solve the main modern problems of renewable energy in general and photovoltaic energy in particular. It was determined that the main problem of the new energy sector is to overcome the technological barrier to the integration of hybrid microenergy systems as cells of the smart grid of the future. Much attention was paid to the problem of energy storage in modern energy as a means of improving the flexibility and sustainability of the Microgrid in combination with renewable energy sources. The issues discussed were followed by the formation of new solutions to the problems posed.Methods: this chapter contains the main developed and actively developing technologies for creating specialized equipment that will significantly simplify the design and increase speed. The key task in this direction is the development of the Virtual Synchronous Machine (VSM), which has a high level of controllability and dynamic stability. The article presents the main schemes of operation of this equipment.Results and discussions: in the future, it is assumed that electric power systems will consist of a multitude of microsystems interconnected by backup links. This chapter contains current methods of promoting new solutions to the markets. Conclusion: based on the work carried out, the main conclusions were formulated.

scholarly journals Area-Based Approach in Power Quality Assessment

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Surajit Chattopadhyay ◽  
Samarjit Sengupta ◽  
Madhuchhanda Mitra
Keyword(s):  
Power Quality ◽  
Quality Parameters ◽  
Computational Effort ◽  
Phase System ◽  
Transformation Technique ◽  
Three Phase ◽  
Harmonic Voltage ◽  
Park Transformation ◽  
Harmonic Components ◽  
Good Agreement

This paper presents an approach for assessment of power quality parameters using analysis of fundamental and harmonic voltage and current waveforms. Park transformation technique has been utilized for the analysis in three-phase system, which has reduced the computational effort to a great extent. Contributions of fundamental and harmonic components in power system voltage and current signals have been assessed separately. An algorithm has been developed to calculate the power quality parameters from online signals. This algorithm has been simulated for a radial system, and the results have been compared with that obtained from a standard FFT-based system. The results are seen to be in good agreement with that of the standard system.

scholarly journals Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

Machines ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 127
Author(s):  
Alexander S. Maklakov ◽  
Tao Jing ◽  
Andrey A. Radionov ◽  
Vadim R. Gasiyarov ◽  
Tatyana A. Lisovskaya
Keyword(s):  
Phase Shift ◽  
Power Systems ◽  
Power Quality ◽  
Electromagnetic Compatibility ◽  
Work Roll ◽  
Quality Parameters ◽  
Power Circuit ◽  
Electric Power Supply ◽  
Positive Effects ◽  
Harmonic Distortions

The existing publications on the analysis of power quality indicators in modern electric power supply systems are void of a comprehensive approach to improving these indicators in power systems by implementing multipulse connections. To the authors’ knowledge, this paper is the first to analyze current harmonic distortions in an 18-pulse connection of three-level active front-ends (AFE) featuring a programmed PWM. Raw data were obtained from, and current quality was analyzed for the power circuit of the main electric drive actuating the rolls in the rolling stand of a plate mill. The key feature of such circuitry is that the synchronous motor of each work roll is connected to the grid with an 18-pulse connection that uses three phase-shift transformers, where the phase shifts are 0° (delta/delta), 20° (delta/polygon) and −20° (delta/polygon). The circuitry connects three frequency converters (FC) with the AFEs in parallel. Phase-shift transformers were found to periodically overheat in the process. When overheating occurred, a programmed PWM voltage waveform was applied where harmonics 17 and 19 were eliminated. The goal and objectives were to analyze why the transformer would overheat and to find out how the issue could be addressed. The authors developed a simulation model of the research object in order to assess power quality parameters. Simulation results obtained in Matlab/Simulink were used to estimate the total harmonic distortions (THD) and individual harmonic factors for up to the 50th secondary transformer winding and grid harmonic with four different programmed AFE PWM voltage waveforms. The results helped find the best such waveform to prevent phase-shift transformers from overheating; one with harmonics 5, 7, 17 and 19 eliminated. The experimental and mathematical modeling results in the paper were confirmed by positive effects after industrial implementation of the system. Research performed directly on the operating equipment has been classified by the company and is not publicly available. These results are highly versatile and could be used in similar research on other circuitries to ensure the electromagnetic compatibility of nonlinear power-consuming devices.

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