scholarly journals Voltage Compensation In Wind Power System Using STATCOM Controlled By Soft Computing Techniques

2017 ◽  
Vol 7 (2) ◽  
pp. 667
Author(s):  
Bineeta Mukhopadhyay ◽  
Rajib Kumar Mandal ◽  
Girish Kumar Choudhary
Keyword(s):  
Soft Computing ◽  
Reactive Power ◽  
Wind Farms ◽  
Performance Comparison ◽  
Simultaneous Occurrence ◽  
Double Line ◽  
Voltage Compensation ◽  
Soft Computing Techniques ◽  
Point Of Common Coupling ◽  
Common Coupling

<span lang="EN-US">When severe voltage sags occur in weak power systems associated with grid-connected wind farms employing doubly fed induction generators, voltage instability occurs which may lead to forced disconnection of wind turbine. Shunt flexible AC transmission system devices like static synchronous compensator (STATCOM) may be harnessed to provide voltage support by dynamic injection of reactive power. In this work, the STATCOM provided voltage compensation at the point of common coupling in five test cases, namely, simultaneous occurrence of step change (drop) in wind speed and dip in grid voltage, single line to ground, line to line, double line to ground faults and sudden increment in load by more than a thousand times. Three techniques were employed to control the STATCOM, namely, fuzzy logic, particle swarm optimization and a combination of both. A performance comparison was made among the three soft computing techniques used to control the STATCOM on the basis of the amount of voltage compensation offered at the point of common coupling. The simulations were done with the help of SimPowerSystems available with MATLAB / SIMULINK and the results validated that the STATCOM controlled by all the three techniques offered voltage compensation in all the cases considered.</span>

Research of SC for Improving LVRT Capability of FSIG

2012 ◽  
Vol 512-515 ◽  
pp. 758-762
Author(s):  
Guo Qing Li ◽  
Li Meng Wang
Keyword(s):  
Wind Power ◽  
Reactive Power ◽  
Short Circuit ◽  
Wind Farms ◽  
Mathematic Model ◽  
Point Of Common Coupling ◽  
Fast Development ◽  
Terminal Voltage ◽  
Common Coupling ◽  
Short Circuit Fault

The fast development of wind power generation brings new requirements for wind turbine integration to grid. In order to improve the lower voltage ride through(LVRT) capability of fixed speed induction generator(FSIG) in wind power generating systems, the mathematic model of FSIG, supercapacitor(SC) and converter is built in DIgSILENT in this paper. A control strategy for FSIG and SC based on wind farms is proposed to enhance the terminal voltage of point of common coupling (PCC) after the clearance of an external short circuit fault. The simulation results show that the terminal voltage of PCC can be significantly improved when there is extra active and reactive power compensation available from SC.

scholarly journals Soft Computing Tool Approach for Texture Classification Using Discrete Cosine Transform

2011 ◽  
pp. 12-16
Author(s):  
Pankaj H. Chandankhede
Keyword(s):  
Neural Network ◽  
Soft Computing ◽  
Learning Algorithm ◽  
Texture Classification ◽  
Fuzzy Model ◽  
Performance Comparison ◽  
Cosine Transform ◽  
Neuro Fuzzy ◽  
Soft Computing Techniques ◽  
Computing Models

Texture can be considered as a repeating pattern of local variation of pixel intensities. Cosine Transform (DCT) coefficients of texture images. As DCT works on gray level images, the color scheme of each image is transformed into gray levels. For classifying the images using DCT, two popular soft computing techniques namely neurocomputing and neuro-fuzzy computing are used. A feedforward neural network is used to train the backpropagation learning algorithm and an evolving fuzzy neural network to classify the textures. The soft computing models were trained using 80% of the texture data and the remaining was used for testing and validation purposes. A performance comparison was made among the soft computing models for the texture classification problem. In texture classification the goal is to assign an unknown sample image to a set of known texture classes. It is observed that the proposed neuro-fuzzy model performed better than the neural network.

scholarly journals Generation of Optimal Switching Angle for Nine Level Cascaded H Bridge MLI Using Most Valuable Player Algorithm

2021 ◽  
Vol 12 (6) ◽  
pp. 1919-1927
Author(s):  
Vijaya Anand N, Hema Latha J, G Devadasu, Kumar C
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Voltage Level ◽  
Computing Technique ◽  
Power Exchange ◽  
Point Of Common Coupling ◽  
Terminal Voltage ◽  
Common Coupling ◽  
Micro Grids

Distributed generation (DG) sources often interfaced with grid by a Cascaded H-bridge multilevel inverter with a remote D.C source. The interface inverter has to adapt voltage on the either side of the grid and DG source while it has a control of active and reactive power exchange. The inverter terminal voltage is maintained based on frequency switching technique. However, in applications like micro grids are based on quality of output voltage at the point of common coupling. The present paper discusses an optimal frequency switching methodology that generates optimal fringing angle based on an evolutionary computing technique while maintaining the voltage level at PCC with a reduced harmonic distortion.  Efficacy of the proposed method is illustrated by simulating a 9-level cascaded H bridge in MATLAB environment.

scholarly journals Application of Posicast controller with SVC in wind-diesel hybrid power system model

2021 ◽  
Vol 3 (4) ◽  
Author(s):  
Pabitra Kumar Guchhait ◽  
Abhik Banerjee ◽  
V. Mukherjee
Keyword(s):  
Power System ◽  
Soft Computing ◽  
Hybrid Model ◽  
Reactive Power ◽  
Reference Signal ◽  
Voltage Response ◽  
Hybrid Power System ◽  
Model Stability ◽  
Hybrid Power ◽  
Soft Computing Techniques

AbstractPosicast controller is used to damp out oscillations of power system by changing excitation of the reference signal. The main purpose of this controller is to reduce the overshoot and the rising time of the transient voltage response of power system. In the present work, Posicast controller and static VAR controller (SVC) have been used to enhance the stability under any form of small disturbance of a wind-diesel hybrid power system (WDHPS) model. Stability of the hybrid model is, mainly, affected by the active and the reactive power unbalance. In this paper, reactive power unbalance has been carried out and it may be handled by using these two controllers. In the studied WDHPS model, a power system stabilizer (mainly, PSS3B) is also included along with the Posicast with SVC controller and performance of the hybrid model is investigated with the help of different soft computing techniques. Soft computing techniques are, basically, used to adjust the different parameters of the studied WDHPS based model for smooth and healthy operations of the hybrid model. The employed technique establishes better performance of the studied WDHPS based model in terms of superior dynamic reactive power compensation offered in real-time.

scholarly journals Distortion Load Identification Based on the Application of Compensating Devices

Energies ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1430 ◽  
Author(s):  
Yaroslav Shklyarskiy ◽  
Aleksandr Skamyin ◽  
Iaroslav Vladimirov ◽  
Farit Gazizov
Keyword(s):  
Reactive Power ◽  
Electric Load ◽  
Electrical Grid ◽  
Voltage Distortion ◽  
New Methods ◽  
Point Of Common Coupling ◽  
Limited Application ◽  
Common Coupling ◽  
Compensating Devices ◽  
Grid Operation

The article provides an analysis of the existing methods of identifying the consumer’s contribution to voltage distortion at a point of common coupling. The considered methods do not allow correctly and fairly determining the source of harmonic distortions, or they have limited application and difficulties in implementation. The paper proposes new methods for determining the source of high harmonics. The developed methods and techniques are based on the analysis of the grid operation modes with two connected consumers using compensating devices, such as reactive power compensation devices and passive harmonic filters. It is shown that the most promising method is the application of harmonic filters, which allows determining the share of the consumer’s contribution to the voltage distortion. The present research is carried out using a computer simulation of the existing electrical grid, to which consumers with nonlinear electric load are connected. These methods can be implemented to assess the power quality and the shareholding of different consumers connected at the point of common coupling. Furthermore, such methods appear to be feasible, as almost every enterprise currently has such facilities in operation.

Reviews on MATLAB DSTATCOM Simulation Models in Mitigating Power Quality Problems

2015 ◽  
Vol 793 ◽  
pp. 467-472
Author(s):  
N.H. Baharudin ◽  
T.M.N.T. Mansur ◽  
Muhd Hafizi Idris ◽  
Rosnazri Ali ◽  
Syed Idris Syed Hassan
Keyword(s):  
Power Factor ◽  
Reactive Power ◽  
Simulation Models ◽  
Reference Source ◽  
Average Model ◽  
Q Theory ◽  
Active And Reactive Power ◽  
Point Of Common Coupling ◽  
Common Coupling ◽  
Static Compensator

This paper reviews the performance of detailed and average model for distribution static compensator (DSTATCOM) in order to remove voltage flicker, regulate the voltage at point of common coupling (PCC), power factor correction and harmonics elimination. In these models, d-q theory is used to extract fundamental active and reactive power components of the load currents which will be required to estimate the reference source currents. Both models are evaluated and compared in MATLAB/Simulink based simulation platform.

scholarly journals Innovative Detection of Isolation and Recombination Technique with Micro Grid

2019 ◽  
Vol 9 (1) ◽  
pp. 6829-6836
Keyword(s):  
Distributed Generation ◽  
Reactive Power ◽  
Voltage Sag ◽  
Phase Jump ◽  
Innovative Technique ◽  
Point Of Common Coupling ◽  
In Series ◽  
Common Coupling ◽  
Power Quality Conditioner

An innovative technique of the Unified power quality conditioner for the location, control and integration in the Distributed generation which is based on autonomous and grid connected µg system is proposed and simulated. At Point of Common Coupling, DG converters that has storage andshunt part of APFof UPQC are connected. Before the PCC, the grid and the series part of the UPQC APFare connected in series. Also the DC link is integrated with energy storage. As a secondary mode of control, an innovative technique is introduced in UPQC for the detection of isolation and recombination inµg. Henceforth, it is described as innovative detection of isolation and recombination technique. In this system an effectual method is used for proper functioning of the recombination and isolation detection. Along with the increase in the quality of the power in terms of voltage sag/swell, compensation of the reactive power and harmonics in recombination mode, additionally it compensates voltage interruption over normal UPQC and also DG converter remains connected during the conditions of disturbances in voltage and also phase jump. The performance of the UPQC is simulated and results are analysed.

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