Research on Modeling and Control Strategy for Two-Stage Photovoltaic Grid-Connected System

2014 ◽  
Vol 1008-1009 ◽  
pp. 16-21
Author(s):  
Xia Dong ◽  
Li Na Zhang ◽  
Yu Ying Fu ◽  
Cui Lian Ji
Keyword(s):  
Control Strategy ◽  
High Performance ◽  
Dynamic Performance ◽  
Mathematic Model ◽  
Two Stage ◽  
Lcl Filter ◽  
Modeling And Control ◽  
Point Tracking ◽  
Power Point ◽  
And Control

This paper has built the mathematic model of the single-phase two-stage photovoltaic(PV) grid-connected system. The model consists of a boost DC/DC converter and a DC/AC inverter with LCL filter. On the basis of the variable step perturbation and observation method(P&O), the boost converter changes the output voltage of the PV array by adjusting the duty cycle to realize the PV maximum power point tracking(MPPT). The inverter system restrains the voltage fluctuation effectively by using feed-forward of the grid voltage and current tracking control technology, which has the high performance in both sinusoidal reference tracking and disturbance rejection. LCL filter improves the dynamic performance and restrains the high harmonics efficiently. The simulation with Matlab soft confirms the effectiveness of the model and control strategy.

Compensation of the Nonlinear Effect on Anelectro Hydrostatic Cylinder Driver for the Transit and Rotating Motion Using Bilinear System

2014 ◽  
Vol 875-877 ◽  
pp. 2097-2106
Author(s):  
Rai Wung Park
Keyword(s):  
High Performance ◽  
Nonlinear Behavior ◽  
Bilinear System ◽  
Mathematic Model ◽  
Modeling And Control ◽  
Extended Application ◽  
Physical Information ◽  
Complete Form ◽  
And Control ◽  
Operating Points

The transit motion and the rotating motion have highly different effects in a technical systems and have almost nonlinear system behaviors. For the descriptions of their dynamical causes and effects on system, the physical information, which is concerned as a nonlinear mathematic model, has been used. But the corresponding equations are generally not easy to solve in complete form or their solutions are so complicated to see through the coherence. A common way to settle such a problem is to linearize system exactly in a state space or on a operating points with Taylor's series approximately. An advanced method to an approximation is a bilinear system that offers global separations principle. In this paper, an extended application of this theory is given in a modeling and control on the electro hydrostatic cylinder driver with both the transit and rotating motions for the keel system that mostly have not only advantage of high performance, small volume of building and weight but also high nonlinear behavior.

Modeling and Simulation of Three Phase Photovoltaic Grid-Connected Generation System

2011 ◽  
Vol 347-353 ◽  
pp. 1144-1148
Author(s):  
Jin Yong Lei ◽  
Xu Zhu Dong ◽  
Hong Bin Wu
Keyword(s):  
Control Strategy ◽  
Characteristic Curve ◽  
Mathematic Model ◽  
Photovoltaic Array ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Three Phase ◽  
Loop Feedback ◽  
Power Point ◽  
Feedback Control Strategy

According to the principle of photovoltaic(PV) grid-connected generation, the maximum power point tracking (MPPT) and grid-connected control strategy were presented in this paper. Based on the V-I characteristic curve of photovoltaic array, it built the mathematic model of photovoltaic array and the MPPT algorithm. Through adopting the double-loop feedback control strategy, it achieved the unit power factor control. Lastly, with the example system, it implemented the simulations analysis including the sunlight changing and the temperature changing. The simulation results show that the proposed models and the control strategy are correct.

scholarly journals Direct and indirect vector control of a doubly fed induction generator based in a wind energy conversion system

2019 ◽  
Vol 9 (3) ◽  
pp. 1531
Author(s):  
Manale Bouderbala ◽  
Badre Bossoufi ◽  
Ahmed Lagrioui ◽  
Mohammed Taoussi ◽  
Hala Alami Aroussi ◽  
...  
Keyword(s):  
Wind Energy ◽  
Wind Power ◽  
Induction Generator ◽  
Doubly Fed Induction Generator ◽  
Modeling And Control ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Power Point ◽  
Doubly Fed ◽  
And Control

<p>In the recent years, the development and the exploitation of renewable energy knew a great evolution. Among these energy resources, the wind power represents an important potential for that the wind system has been the subject of several researches. The purpose of this study is to improve the power extracted from wind energy, taking into consideration the variation of wind speed which causes a problem in energy production. For this purpose, we have controlled the powers whether it is active or reactive delivered by the generator. This paper, presents essentially the modeling and control of doubly- fed induction generator (DFIG), which is connected to a variable speed wind turbine. Firstly, the model of the wind power system with the maximum power point tracking (MPPT) strategy is shown. Then, the modeling of doubly- fed induction generator (DFIG) and its power control is presented. Finnaly, to ensure the attitude of these controls the simulations is presented in the Matlab/Simulink environment.</p>

scholarly journals A Robust Control of Two-Stage Grid-Tied PV Systems Employing Integral Sliding Mode Theory

2018 ◽  
Author(s):  
Abbas Kihal ◽  
Fateh Krim ◽  
Billel Talbi ◽  
Abdelbaset Laib ◽  
Abdeslem Sahli
Keyword(s):  
Control Strategy ◽  
Sliding Mode ◽  
Maximum Power Point ◽  
High Quality ◽  
Two Stage ◽  
Integral Sliding Mode ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Control Scheme ◽  
Power Point

This contribution considers an improved control scheme for three-phase two-stage grid-tied photovoltaic (PV) power system based on integral sliding mode control (ISMC) theory. The proposed control scheme consists of maximum power point tracking (MPPT), DC-Link voltage regulation and grid currents synchronization. A modified voltage-oriented maximum power point tracking (VO-MPPT) method based on ISMC theory is proposed for design of an enhanced MPPT under irradiation changes. Moreover, a novel DC-Link voltage control based on ISMC theory is proposed in order to achieve good regulation of DC-Link voltage over its reference. To inject the generated PV power into the grid with high quality, a voltage oriented control based on space vector modulation (SVM) and ISMC (VOC-ISMC-SVM) has been developed to control the grid currents synchronization. Numerical simulations are performed in Matlab/SimulinkTM environment in order to evaluate the proposed control strategy. In comparison with conventional control scheme, the developed control strategy provides an accurate MPP tracking with less power oscillation as well as a fast and an accurate DC-Link regulation under climatic conditions variations. Moreover, the transfer of the extracted power into the grid is achieved with high quality.

Modeling and Control of a Flexible Input Boost Chopper Linked to AC Drive System

2011 ◽  
Vol 383-390 ◽  
pp. 4352-4357
Author(s):  
Ze Yun Chao ◽  
Wei Jia Fang
Keyword(s):  
Dynamic Performance ◽  
Mathematic Model ◽  
Input Voltage ◽  
Drive System ◽  
Modeling And Control ◽  
Ac Drive ◽  
Ac Motor ◽  
Battery Packs ◽  
Constant Output ◽  
And Control

In order to assure the inverter could operate either from rectifier utility power or battery packs to provide regulated sinusoidal power for ac motor, a boost chopper with flexible input voltages and constant output voltage usually used to offer the link dc voltage to ac drive system. In this paper, the objective is to propose a new control scheme to assure the boost chopper has good dynamic performance under the disturbance of input voltage and load. The mathematic model of the boost chopper based on PWM three-terminal switch device is discussed. The test results show that the proposed control system has robust performance with whether the disturbance of input voltage or loads.

scholarly journals A Robust Control of Two-Stage Grid-Tied PV Systems Employing Integral Sliding Mode Theory

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2791 ◽  
Author(s):  
Abbes Kihal ◽  
Fateh Krim ◽  
Billel Talbi ◽  
Abdelbaset Laib ◽  
Abdeslem Sahli
Keyword(s):  
Control Strategy ◽  
Sliding Mode ◽  
Maximum Power ◽  
Maximum Power Point ◽  
High Quality ◽  
Two Stage ◽  
Point Tracking ◽  
Power Point Tracking ◽  
Control Scheme ◽  
Power Point

This contribution considers an improved control scheme for three-phase two-stage grid-tied photovoltaic (PV) power systems based on integral sliding mode control (ISMC) theory. The proposed control scheme consists of maximum power point tracking (MPPT), DC-Link voltage regulation and grid current synchronization. A modified voltage-oriented maximum power point tracking (VO-MPPT) method based on ISMC theory is proposed for design of an enhanced MPPT under irradiation changes. Moreover, a novel DC-Link voltage controller based on ISMC theory is proposed to achieve good regulation of DC-Link voltage over its reference. To inject the generated PV power into the grid with high quality, a voltage-oriented control based on space vector modulation (SVM) and ISMC (VOC-ISMC-SVM) has been developed to control the grid current synchronization. Numerical simulations are performed in a MATLAB/SimulinkTM (R2009b, MathWorks, Natick, MA, USA) environment to evaluate the proposed control strategy. In comparison with conventional control schemes, the developed control strategy provides an accurate maximum power point (MPP) tracking with less power oscillation as well as a fast and an accurate DC-Link regulation under varying irradiation conditions. Moreover, the transfer of the extracted power into the grid is achieved with high quality.

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