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.

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 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.

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.

scholarly journals Simulation of Grid Connected Three-Level Neutral-Point-Clamped qZS Inverter using PSCAD

2013 ◽  
Vol 2 (1) ◽  
pp. 14-19
Author(s):  
Carlos Roncero-Clemente ◽  
Enrique Romero-Cadaval ◽  
Oleksandr Husev ◽  
Dmitri Vinnikov ◽  
Serhii Stepenko
Keyword(s):  
Control Strategy ◽  
Input Voltage ◽  
Neutral Point ◽  
Electrical Grid ◽  
Photovoltaic Applications ◽  
Point Of Common Coupling ◽  
Common Coupling ◽  
Output Filter ◽  
Better Than ◽  
Peak Value

AbstractThis paper is focused on a single-phase three-level neutral-point-clamped quasi-z-source inverter when it is operating being connected to the electrical grid. A control strategy for injecting current synchronized in phase with the voltage at the point of common coupling has been proposed and studied. It is achieved by means of controlling the output voltage between branches adjusting the output current by using a d-q frame and the analysis of the output filter. The control strategy generates the reference to be used in the modulation technique and it has been validated with and without shoot-through switching states. A method to calculate the minimum value of the shoot-through duty cycle is also explained in order to assure the proper control of the injected current when the input voltage is less than peak value of the grid voltage. It is an important feature because 3L-NPC qZSI due to its possibility of boosting input voltage in a single stage would operate better than a traditional inverter, for instance in photovoltaic applications when the value of irradiance is decreased. The presented results have been obtained using PSCAD/EMTDC as a simulation tool.

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>

scholarly journals IMPROVEMENT OF POWER SYSTEM QUALITY USING VSC-BASED HVDC TRANSMISSION

2017 ◽  
Vol 36 (3) ◽  
pp. 889-896
Author(s):  
OJ Eyenubo ◽  
P Oshevire
Keyword(s):  
Power Flow ◽  
Reactive Power ◽  
Principal Characteristic ◽  
System Quality ◽  
Phase Voltage ◽  
Hvdc Transmission ◽  
Power Electronics Converters ◽  
Point Of Common Coupling ◽  
Common Coupling ◽  
Peak Phase

The HVDC technology can be represented by the combination of a Direct Current (DC) circuit with two power electronics converters, each one at a link terminal, for AC/DC and DC/AC conversion The principal characteristic of VSC-HVDC transmission is its ability to independently control the reactive and real power flow at each of the AC systems via the Point of Common Coupling (PCC). The active and reactive power is related to the power angle and the magnitude of  voltage in the reference -frame selected such that the quadrature component will result in the ratio between the maximum fundamental peak phase voltage and the DC total voltagehttp://dx.doi.org/10.4314/njt.v36i3.31

Grid voltage local regulation by a doubly fed induction generator–based wind turbine

2016 ◽  
Vol 41 (1) ◽  
pp. 13-25 ◽  
Author(s):  
Mohamed Kesraoui ◽  
Ahmed Chaib ◽  
Boujemaa Bendaoui ◽  
Djalloul Achour
Keyword(s):  
Wind Energy ◽  
Energy Conversion ◽  
Reactive Power ◽  
Wind Energy Conversion System ◽  
Wind Energy Conversion ◽  
Conversion System ◽  
Point Of Common Coupling ◽  
Energy Conversion System ◽  
Common Coupling ◽  
Doubly Fed

Voltage regulation at point of common coupling using a doubly fed induction generator–based wind energy conversion system is achieved through reactive power control. Wind energy conversion system produces reactive power when the voltage is less than grid nominal voltage and it consumes it in the opposite case. In this article, a method to achieve this goal is proposed. It consists of controlling the reference value of the vector control system in order to affect the wind energy conversion system reactive power output. Two situations have been simulated. Sudden voltage increase and decrease were applied to the control system. Satisfying results have been obtained since the voltage at point of common coupling has been restored back to its initial value.

scholarly journals Peak Detection Control Strategy based STATCOM for Suppression of Power Quality Problems

2019 ◽  
Vol 87 ◽  
pp. 01027
Author(s):  
J. Bangarraju ◽  
V. Rajagopal ◽  
V. Sharada ◽  
K. Lakshmaiah
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Neutral Current ◽  
Voltage Regulation ◽  
Peak Detection ◽  
Point Of Common Coupling ◽  
Common Coupling ◽  
Static Compensator ◽  
Regulation Mode ◽  
Zero Voltage

This paper explains about control of VSC using uni-polar switching based Static Compensator (STATCOM) using Peak Detection Control Strategy for elimination of PQ Problems. The proposed STATCOM are operated in PFC (Power Factor Correction) mode and ZVR (Zero Voltage Regulation) mode. Under these operation modes of STATCOM is able to suppression of harmonics, PFC at source, reactive power compensation, load balancing and compensation of neutral current. A non-isolated star/three individual single- phase transformers are connected at PCC (Point of Common Coupling) to mitigate neutral current. The Peak Detection Control Strategy is simple to implement for estimating switching pulses for VSC. This peak detection control strategy based STATCOM is modelled, simulated results are validated using MATLAB R2013b.

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