scholarly journals Study of Necessities and Technologies for Using Hybrid Photovoltaic-Wind Power Systems

2015 ◽  
Vol 16 (1) ◽  
pp. 7
Author(s):  
Sobhan Dorahaki
Keyword(s):  
Energy Source ◽  
Solar Energy ◽  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Clean Energy ◽  
Solar Systems ◽  
Wind Power System ◽  
Wind Power Systems ◽  
Clean Energy Source

In recent years, increase in environment concerns and demand for energy are two main issues in ongoing growth of using solar systems. Solar energy has been known as a renewable and clean energy source. One of the most applied and new ways for using sun energy is hybrid photovoltaic technology. This paper discusses requirements, methods, limitations and technologies used in the hybrid photovoltaic-wind power system.

A Review on Low Voltage Ride-Through Solutions for PMSG Wind Turbine

2014 ◽  
Vol 1070-1072 ◽  
pp. 209-215
Author(s):  
Mei Zhang ◽  
Hai Qin Xue ◽  
Shui Liang Zhou
Keyword(s):  
Power Systems ◽  
Wind Power ◽  
Low Voltage ◽  
Voltage Drop ◽  
Direct Drive ◽  
Low Voltage Ride Through ◽  
Voltage Drops ◽  
Wind Power System ◽  
Power Generation System ◽  
Wind Power Systems

The exiting of wind turbines will cause the adverse effect on the power grid and its assembling unit in network voltage drops. So, direct-drive wind power generation system should meet the requirement of the certain ability of low voltage. This paper introduces the influence of wind power system with different structure by voltage drop as well as the disadvantage and advantage on LVRT. The relate regulations based on LVRT are analyzed. The existing LVRT technologies of direct-drive wind power systems are briefly presented. The characteristics of each scheme from the different LVRT technology are analyzed. Moreover, further study of LVRT for PMSG is pointed out.

scholarly journals Solar Energy Use in Dryers as an Alternative Energy Source in Agriculture

2010 ◽  
Vol 67 (1) ◽  
Author(s):  
Mirela MILITARU ◽  
Elena POSTELNICU ◽  
Mihai CHIŢOIU ◽  
Valentin VLĂDUŢ
Keyword(s):  
Energy Source ◽  
Solar Energy ◽  
Alternative Energy ◽  
Energy Use ◽  
Clean Energy ◽  
Energy Sources ◽  
Negative Effects ◽  
Alternative Energy Source ◽  
Different Types ◽  
Clean Energy Source

Solar energy represents one of the future energy sources with a high potential, used as an alternative to conventional methods, especially during summer. The advantages of using solar energy are multiple, this type of energy being virtually endless and free, and its use has no negative effects on the environment, being regarded as a clean energy source. Solar energy has multiple applications in agriculture, one of its benefits being that it is used for dryers as an alternative energy source, especially in regions with a high solar potential. In this paper different types of fruits and vegetable dryers, nationally and abroad are presented, as well as results obtained from different methods of solar dryers.

A SysML based hybrib photovoltaic-wind power system model

2017 ◽  
Vol 1 (2) ◽  
pp. 1
Author(s):  
Doudou Nanitamo Luta ◽  
Atanda K. Raji
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Systems Engineering ◽  
System Modeling ◽  
Point Of View ◽  
Modeling Language ◽  
Wind Power System ◽  
And Behavior ◽  
Model Based Systems Engineering

This paper presents a model of hybrid photovoltaic-wind power system based on SysML (System Modeling Language) which is a modeling language in supports to Model Based Systems Engineering (MBSE) practices. MBSE refers to a formalized procedure of systems development through the application of modeling principles, methods, languages and tools to the complete lifetime of a system.  Broadly speaking, the modeling of power systems is performed using software such as Matlab/Simulink, DigSilent, PowerWorld, ETAP, etc. These tools allow modeling considering a particular point of view depending on the objective that is to be assessed. SysML offers different aspects ranging from specifications and requirements, structure and behavior. This study focuses more specifically on the structural and behavioral modeling of hybrid photovoltaic-wind system; the main objective is to demonstrate the use of SysML in power systems’ modeling by developing models capturing the system’s major requirements, the structure and connection between entities, the interaction between stakeholders and the system itself and lastly, the system’s behavior in terms of transition between states.

The Grid-Connected Inverter of Simulation on Direct-Drive Wind Power System Based on MATLAB

2013 ◽  
Vol 756-759 ◽  
pp. 4166-4170
Author(s):  
Xiao Ming Wang ◽  
Wan Ci Liu ◽  
Wen Juan Xiao
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Pulse Width Modulation ◽  
Modulation Method ◽  
Effective Control ◽  
Direct Drive ◽  
Loop Control ◽  
Wind Power Systems ◽  
Grid Connected Inverter

Based on working Principle of the direct-drive wind power systems grid-connected inverter was research, the mathematical model for inverter in Three-phase rotating coordinate was established and analyzed. A double-loop control strategy that based on feed forward decoupling were introduced, Meanwhile, combining the implementation effective control of the AC-side output current by the Space Vector Pulse Width Modulation method (SVPWM), it could generate sine wave current that had the same frequency and the same phase with network voltage. To a great degree, reduced harmonic pollution in power system, moreover, improved the Grid-connected wind power systems efficiency and reliability.

scholarly journals Double-Fed Wind Power System Adaptive Sensing Control and Condition Monitoring

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Jing Peng ◽  
Peng Yang ◽  
Zhiqi Liu
Keyword(s):  
Power Generation ◽  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Ferromagnetic Resonance ◽  
Inverse System ◽  
Control Technology ◽  
Adaptive Sensing ◽  
Wind Power Systems ◽  
Doubly Fed

This paper presents an in-depth study and analysis of improving the performance of doubly fed wind power systems using adaptive sensing control technology. The maximum wind energy tracking principle is analyzed in this paper with the wind turbine operation characteristics. Considering that the operation state and control strategy of a doubly fed wind power generation system is different before and after grid connection, the no-load simulation model and power generation simulation model are established based on the idea of separate modeling and time-sharing work. Combined with the respective control strategies and enabling modules, the overall simulation system is constituted for the continuous process from no-load operation to power generation operation. To analyze the chaotic mechanism of ferromagnetic resonance of wind farm power system and suppress the problem, based on the ferromagnetic resonance model of wind farm power system, analyze the basic conditions of the system into the chaotic state, consider the resonance phenomenon when external excitation acts, adopt the multiscale method to calculate the approximate solution at the resonance of main parameters and determine the steady-state solution and stability conditions, and explore the influence of external excitation on the dynamic characteristics of ferromagnetic resonance. In this paper, the inverse system approach, applied to the linearized decoupling of doubly fed wind power, a nonlinear, strongly coupled multivariable system, is derived for the no-load inverse system model and the inverse system model for the power control scheme and the speed control scheme to achieve maximum wind energy tracking for grid-connected power generation, respectively. The model further extended to fractional order to study the complex dynamical behavior of the system of different orders and flux chain subsquares. To suppress the system chaotic oscillation phenomenon, a fractional-order finite-time terminal sliding mode controller is proposed based on the frequency distribution model with time-frequency domain conversion, which achieves the suppression of chaotic phenomena in resonant overvoltage infinite time and is compared with the conventional sliding mode to confirm the effectiveness and superiority of the proposed controller. This paper explores and discusses the impact of adaptive sensing control technology on the practice of doubly fed wind power systems, to provide theoretical possibilities for the adaptive sensing control technology to be more effective for the practice of doubly fed wind power systems.

The Research of Voltage Stability in Wind Power System

2013 ◽  
Vol 316-317 ◽  
pp. 64-67
Author(s):  
You Jie Ma ◽  
Yu Zhang ◽  
Xue Song Zhou
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Voltage Stability ◽  
Wind Farms ◽  
Research Problem ◽  
Research Trend ◽  
Dynamic Voltage ◽  
Wind Power System ◽  
The Difference

Wind power is a kind of special electric power, because of the volatility of the wind, making voltage stability has become an important research problem wind power system must facing with. Therefore, according to the relevant current research status and the main existent problems of wind power system, expounding the difference of voltage stability between the conventional energy sources and the wind power, and the influence of voltage stability to the power system which caused by wind power system. This paper mainly from the definition and the classification to introduce the voltage stability; from the research contents and methods of static and dynamic voltage stability to analyze power systems which contains wind farms, especially emphasizing the necessity of the bifurcation theory used in power system contains wind power. Finally points out that the research trend of analysis and improvement in this area.

scholarly journals Maximizing Hydrogen Production by Cyanobacteria

2008 ◽  
Vol 63 (3-4) ◽  
pp. 226-232 ◽  
Author(s):  
Hermann Bothe ◽  
Stefanie Winkelmann ◽  
Gudrun Boison
Keyword(s):  
Energy Source ◽  
Hydrogen Production ◽  
Solar Energy ◽  
Energy Conversion ◽  
Molecular Hydrogen ◽  
Solar Energy Conversion ◽  
Clean Energy ◽  
Anabaena Variabilis ◽  
High Concentrations ◽  
Clean Energy Source

When incubated anaerobically, in the light, in the presence of C2H2 and high concentrations of H2, both Mo-grown Anabaena variabilis and either Mo- or V-grown Anabaena azotica produce large amounts of H2 in addition to the H2 initially added. In contrast, C2H2- reduction is diminished under these conditions. The additional H2-production mainly originates from nitrogenase with the V-enzyme being more effective than the Mo-protein. This enhanced H2-production in the presence of added H2 and C2H2 should be of interest in approaches to commercially exploit solar energy conversion by cyanobacterial photosynthesis for the generation of molecular hydrogen as a clean energy source

Summarization on Stability of Wind Power Systems Based on Bifurcation Theory

2012 ◽  
Vol 182-183 ◽  
pp. 1469-1473
Author(s):  
Xue Song Zhou ◽  
Hua Xin Zhai ◽  
You Jie Ma
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Nonlinear Dynamic ◽  
Bifurcation Theory ◽  
Voltage Stability ◽  
Wind Farm ◽  
Nonlinear Dynamic System ◽  
Structure Stability ◽  
Wind Power System

With wind farm capacity continuously increasing, remarkable characteristics of wind power make nonlinear dynamic characteristics of wind power system more apparent than conventional power system. Domestic and international experience shows that the voltage instability is main forms of wind power system instability. The bifurcation theory is one of the most powerful tools in analysis of structure stability of nonlinear dynamic system. Therefore application of bifurcation theory not only reveals the voltage stability mechanism, but also has important theoretic value and practical value for the security analysis of the whole power system, especially for voltage stability of wind power system.

Research Summary of Chaos in Power Systems

2012 ◽  
Vol 182-183 ◽  
pp. 1796-1799
Author(s):  
Xue Song Zhou ◽  
Xin Fang Liu ◽  
You Jie Ma
Keyword(s):  
Power Systems ◽  
Power System ◽  
Wind Power ◽  
Large Scale ◽  
Stable Operation ◽  
Chaotic Phenomena ◽  
Electrical Oscillation ◽  
Fast Development ◽  
Wind Power System ◽  
Non Linear System

It has been found that there is a very complex and chaotic phenomena in the power system and other nonlinear system. Chaos is a very complex phenomenon caused by the interaction of the parameters in nonlinear systems, its appearance will accompany the non-periodic、seems to be without rules、sudden or paroxysmal mechanical and electrical oscillation of the system, which will cause widespread blackout and disintegration of the system when the oscillation becomes serious. Therefore, due to the wind power system is a typical large-scale complex non-linear system, so that chaotic phenomena will also occur under certain conditions and chaos will influence the stable operation of the wind power system, so the chaotic research are particularly important along with the fast development of grid-connected wind power technology.

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