scholarly journals Takagi–Sugeno State Delayed Feedback and Integral Control for PV Systems: Modeling, Simulation, and Control

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Hicham El Aiss ◽  
Karina A. Barbosa ◽  
Hector Chavez ◽  
Carlos Rodriguez
Keyword(s):  
Power Systems ◽  
Control Strategy ◽  
Large Scale ◽  
Delayed Feedback ◽  
Photovoltaic System ◽  
Small Scale ◽  
Photovoltaic Systems ◽  
Integral Control ◽  
Variable Control ◽  
Takagi Sugeno

The integration of the large-scale photovoltaic systems has experienced significant growth, which is similarly expected to occur with small-scale photovoltaic systems. Since small-scale systems must be simple in cost-effective components, control strategies must be implemented in low complexity circuits. However, current maximum power point tracking (MPPT) algorithms are generally complex and require electronic components to support variable control gains for different irradiance conditions, preventing simple MPPT implementations suitable for small-scale photovoltaic systems. This paper proposes a new control strategy to tackle the power tracking problem of the power systems. First, a dynamic model of the photovoltaic system is described and converted into a Takagi–Sugeno (T-S) model. Then, an MPPT scheme is proposed in series with a fixed integral and a fuzzy gain state delay feedback controller, which avoids the need for a variable control gain, simplifying the electronic implementation of the control strategy. New delay-dependent stabilization conditions based on the Lyapunov-Krasovskii functional are proposed in terms of a convex optimization problem, where the delayed feedback and integral gains are designed simultaneously. Simulation results using Matlab and Simulink are used to validate the proposed method.

scholarly journals Instantaneous Power Control Strategy for Voltage Improvement in Power Network Equipped by Wind Generator

2021 ◽  
Vol 54 (1) ◽  
pp. 147-154
Author(s):  
Issam Griche ◽  
Sabir Messalti ◽  
Kamel Saoudi
Keyword(s):  
Power Systems ◽  
Power Control ◽  
Wind Power ◽  
Control Strategy ◽  
Large Scale ◽  
Transient Stability ◽  
Short Circuit ◽  
Dynamical Response ◽  
Instantaneous Power ◽  
Wide Range

The uncertainty of wind power brings great challenges to large-scale wind power integration. The conventional integration of wind power is difficult to adapt the demand of power grid planning and operation. This paper proposes an instantaneous power control strategy for voltage improvement in power networks using wind turbine improving the dynamical response of power systems performances (voltage and transient stability) after fault. In which the proposed control algorithm based on a new advanced control strategy to control the injected wind power into power system. The efficiency of developed control strategy has been tested using IEEE 9 Bus. Simulation results have showed that the proposed method perform better to preserve optimal performances over wide range of disturbances for both considered scenarios studied short circuit and variable loads.

scholarly journals Noise assessment of the small-scale wind farm

2019 ◽  
Vol 112 ◽  
pp. 02011
Author(s):  
Cristian-Gabriel Alionte ◽  
Daniel-Constantin Comeaga
Keyword(s):  
Power Systems ◽  
Large Scale ◽  
Wind Farm ◽  
Wind Farms ◽  
Small Scale ◽  
Large Power ◽  
Small Power ◽  
Noise Assessment ◽  
The Impact

The importance of renewable energy and especially of eolian systems is growing. For this reason, we propose the investigation of an important pollutant - the noise, which has become so important that European Commission and European Parliament introduced Directive 2002/49/CE relating to the assessment and management of environmental noise. So far, priority has been given to very large-scale systems connected to national energy systems, wind farms whose highly variable output power could be regulated by large power systems. Nowadays, with the development of small storage capacities, it is feasible to install small power wind turbines in cities of up to 10,000 inhabitants too. As a case study, we propose a simulation for a rural locality where individual wind units could be used. This specific case study is interesting because it provides a new perspective of the impact of noise on the quality of life when the use of this type of system is implemented on a large scale. This option, of distributed and small power wind turbine, can be implemented in the future as an alternative or an adding to the common systems.

scholarly journals The Economic and Geographical Aspects of the Status of Small-Scale Photovoltaic Systems in Hungary—A Case Study

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3489 ◽  
Author(s):  
Gábor Pintér ◽  
Henrik Zsiborács ◽  
Nóra Hegedűsné Baranyai ◽  
András Vincze ◽  
Zoltán Birkner
Keyword(s):  
Power Plants ◽  
Photovoltaic System ◽  
Small Scale ◽  
Photovoltaic Systems ◽  
Comprehensive Investigation ◽  
Photovoltaic Power ◽  
The Status ◽  
Average Size ◽  
Geographical Locations

The use of solar energy is an obvious choice; the energy of the sun is not only indispensable for most processes in nature but it is also a clean, abundant, sustainable, and—most importantly—universally available resource. Although the further spread of photovoltaic systems, which make use of this source of energy, is expected in the future all around the world, no comprehensive investigation has been conducted into the current situation of the small-scale photovoltaic power plants in Hungary, where this type of photovoltaic system is the most popular. By means of a case study, whose novelty lies in its focus on small-scale power plants and their complex examination, including economic and geographic indicators, this paper analyzes their status in Hungary. The study endeavors to establish the reasons for the popularity of this type of power plant and to identify some typical geographical locations with well-illustrated photovoltaic density. Residential, as well as business prosumers, were examined with the aim of learning more about the density of the small-scale photovoltaic systems and their geographical locations. Another goal was to calculate the average size of small-scale photovoltaic power plants and to gain more understanding of their economic aspects. The outcomes of this research include maps displaying the density of the small-scale photovoltaic power plants in Hungary and the results of the economic calculations for such investments.

scholarly journals Analysis of cyber vulnerabilities of the emergency control and relay protection to assess the reliability and survivability of electrical power systems in the era of total digitalization

2020 ◽  
Vol 216 ◽  
pp. 01040
Author(s):  
Alexey Osak ◽  
Daniil Panasetsky ◽  
Elena Buzina
Keyword(s):  
Power Systems ◽  
Control Systems ◽  
Large Scale ◽  
Electrical Power ◽  
Relay Protection ◽  
Distribution Networks ◽  
Cyber Attacks ◽  
Small Scale ◽  
Electrical Power Systems ◽  
Emergency Control

Cyber threats pose an increasing threat to energy objects. It is essential to ensure the cybersecurity of automatic control systems, such as relay protection devices (RP), devices of regime control (RC) and emergency control (EC), automated control systems. At the same time, the issues of cybersecurity include not only the problem of hacker attacks, but also the whole complex of problems relating to adequate functioning of cybernetic systems in the power industry. The authors consider two of the most acute aspects of cybersecurity in the energy systems of the future in the era of total digitalization: large-scale prepared cyber attacks on the electrical power systems (EPS) as a whole and large-scale cyber attacks on distribution networks with small-scale generation facilities and active consumers.

scholarly journals Influence of Single-Phase Solar Photovoltaic Systems on Total Harmonic Distortion: A Case Study

2018 ◽  
Vol 12 (2) ◽  
pp. 607
Author(s):  
Chin Kim Gan ◽  
Sara Ragab Mahmoud ◽  
Kyairul Azmi Baharin ◽  
Mohd Hendra Hairi
Keyword(s):  
Single Phase ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Photovoltaic System ◽  
Design Stage ◽  
Small Scale ◽  
Photovoltaic Systems ◽  
Solar Photovoltaic ◽  
The Impact

<span>The installation of small-scale solar photovoltaic system has recently gaining popularity in Malaysia mainly driven by the Feed-in Tariff scheme. Given its relatively small generation capacity, the single-phase solar inverters are not required to comply with power quality standard. Neverthelss, the impact of small-scale solar system on the grid could become significant when the penetration is increasing over the years. In this regard, this paper presents a case study on the influence of single-phase grid-connected solar photovoltaic systems on the total harmonic distortion for current at the point of common coupling. Field measurements have been carried out for a total of 12 single-phase solar systems which were installed at three different locations at Universiti Teknikal Malaysia Melaka. Detailed analyses have been performed to characterize the aggregated current harmonic performance for the overall system.  The findings from the presented case study suggest that the current quality from the inverter is highly dependent on the level of inverter output. Hence, the proper selection of the array-to-inverter ratio at the system design stage could greatly improve the overall total harmonic performance performance for current.</span><span>The installation of small-scale solar photovoltaic system has recently gaining popularity in Malaysia mainly driven by the Feed-in Tariff scheme. Given its relatively small generation capacity, the single-phase solar inverters are not required to comply with power quality standard. Neverthelss, the impact of small-scale solar system on the grid could become significant when the penetration is increasing over the years. In this regard, this paper presents a case study on the influence of single-phase grid-connected solar photovoltaic systems on the total harmonic distortion for current at the point of common coupling. Field measurements have been carried out for a total of 12 single-phase solar systems which were installed at three different locations at Universiti Teknikal Malaysia Melaka. Detailed analyses have been performed to characterize the aggregated current harmonic performance for the overall system.  The findings from the presented case study suggest that the current quality from the inverter is highly dependent on the level of inverter output. Hence, the proper selection of the array-to-inverter ratio at the system design stage could greatly improve the overall total harmonic performance performance for current.</span>

scholarly journals A Virtual PV Systems Lab for Engineering Undergraduate Curriculum

2014 ◽  
Vol 2014 ◽  
pp. 1-17 ◽  
Author(s):  
Emre Ozkop ◽  
Ismail H. Altas
Keyword(s):  
Power Systems ◽  
Undergraduate Curriculum ◽  
Photovoltaic System ◽  
Solar Irradiation ◽  
Photovoltaic Systems ◽  
Loading Conditions ◽  
Operating Characteristics ◽  
Pv Systems ◽  
Virtual Lab ◽  
Temperature Levels

Design and utilization of a Virtual Photovoltaic Systems Laboratory for undergraduate curriculum are introduced in this paper. The laboratory introduced in this study is developed to teach students the basics and design steps of photovoltaic solar energy systems in a virtual environment before entering the field. The users of the proposed virtual lab will be able to determine the sizing by selecting related parameters of the photovoltaic system to meet DC and AC loading conditions. Besides, the user will be able to analyze the effect of changing solar irradiation and temperature levels on the operating characteristics of the photovoltaic systems. Common DC bus concept and AC loading conditions are also included in the system by utilizing a permanent magnet DC motor and an RLC load as DC and AC loading examples, respectively. The proposed Virtual Photovoltaic Systems Laboratory is developed in Matlab/Simulink GUI environment. The proposed virtual lab has been used in Power Systems Lab in the Department of Electrical and Electronics Engineering at Karadeniz Technical University as a part of undergraduate curriculum. A survey on the students who took the lab has been carried out and responses are included in this paper.

scholarly journals Reserve Allocation of Photovoltaic Systems to Improve Frequency Stability in Hybrid Power Systems

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2583 ◽  
Author(s):  
Mehdi Tavakkoli ◽  
Jafar Adabi ◽  
Sasan Zabihi ◽  
Radu Godina ◽  
Edris Pouresmaeil
Keyword(s):  
Power Systems ◽  
Gas Turbines ◽  
Frequency Control ◽  
Settling Time ◽  
Photovoltaic System ◽  
Photovoltaic Systems ◽  
Pv System ◽  
The One ◽  
Primary Frequency ◽  
Primary Frequency Control

This study suggests a model to include a solar power system or photovoltaic system (PV) in the control of frequency by taking into account a percentage of the PV power production for back-up reserve. This is done by investigating two scenarios: PV contribution in (1) initial primary frequency control and (2) entire primary frequency control. As explained in section three, 10% power of the PV modules which receive more than 400 w/m2 irradiation is allocated for the power reserve. The power generation of photovoltaic systems depends largely on weather conditions which makes their output power associated with some degree of uncertainty. For this reason, in this paper, a PV system is considered along with conventional hydro and thermal units and they are modeled in MATLAB/Simulink (version 9.3, MathWorks, Natick, MA, USA) with the purpose of exploring the behavior of the intended method. In the next phase, for further studies, this system is extended to multi-area power systems including gas turbines. The results of the simulation demonstrated that the photovoltaic involvement in the control of frequency can successfully amend the frequency of the overall network. Not only it can decrease the overshoot and undershoot of the frequency response, it has the ability to improve the settling time as well, which helps the system reach the steady state easily and in shorter time. Specifically, the overshoot has reached nearly zero in both one area and two area systems and undershoot has declined up to 60% and 50% in the one area and two-area system, respectively. Considering settling time, while it had a negligible improvement in the one area system, it showed a remarkable enhancement in the two-area system, which improved from about 25 s to 6 s by using the proposed method.

Recognition of Large-Scale ncRNA Data Using a Novel Multitask Cross-Learning 0-Order TSK Fuzzy Classifier

2020 ◽  
Vol 10 (2) ◽  
pp. 502-507 ◽  
Author(s):  
Yizhang Jiang ◽  
Jiaqi Zhu ◽  
Xiaoqing Gu ◽  
Jing Xue ◽  
Kaifa Zhao ◽  
...  
Keyword(s):  
Classification Accuracy ◽  
Fuzzy Systems ◽  
Large Scale ◽  
Tumor Formation ◽  
Training Data ◽  
Small Scale ◽  
Learning Problem ◽  
Fuzzy Classifier ◽  
Learning Mechanism ◽  
Takagi Sugeno

Recognizing noncoding ribonucleic acid (ncRNA) data is helpful in realizing the regulation of tumor formation and certain aspects of life mechanisms, such as growth, differentiation, development, and immunity. However, the scale of ncRNA data is usually very large. Using machine learning (ML) methods to automatically analyze these data can obtain more precise results than manually analyzing these data, but the traditional ML algorithms can process only small-scale training data. To solve this problem, a novel multitask cross-learning 0-order Takagi–Sugeno–Kang fuzzy classifier (MT-CL-0-TSK-FC) is proposed that uses a multitask cross-learning mechanism to solve the large-scale learning problem of ncRNA data. In addition, the proposed MT-CL-0-TSK-FC method naturally inherits the interpretability of traditional fuzzy systems and eventually generates an interpretable rulesbased database to recognize the ncRNA data. The experimental results indicate that the proposed MT-CL-0TSK-FC method has a faster running time and better classification accuracy than traditional ML methods.

Modeling and Simulation of Grid-Connected Photovoltaic System Based on PSCAD

2014 ◽  
Vol 986-987 ◽  
pp. 367-370 ◽  
Author(s):  
Xian Sui Han ◽  
Qi Hui Liu
Keyword(s):  
Power Systems ◽  
Power Plants ◽  
Large Scale ◽  
Photovoltaic System ◽  
System Response ◽  
Generation System ◽  
Transient Model ◽  
Illumination Changes ◽  
The Stability ◽  
Pv Generation

In order to investigate the impacts of large scale PV power plants on the stability of power system, dynamic PV models are of particular interest to the industry for simulating large-scale power systems. The transient model of large scale grid-connected PV generation system was given based on the model of each component of PV generation system. Response of the model was simulated respectively when the illumination changes. The methods proposed could be applied to the power grid with photovoltaic generation integration.

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