Power Quality Improvement in WECS using Fuzzy – STATCOM

The major concern in a growing power quality is harmonics distortion which is caused by the non-linear nature of the loads. This problem has drawn much attention from utilities, users and industries. To reduce the harmonic distortion for improving the power quality of the system a custom power devices has been proposed. A static compensator (STATCOM) is implemented at distribution level for overcoming several power quality problems. In this paper, new control technic i.e AI is proposed on shunt compensator to estimates the weight values of load currents. The control approach is based on the convergence of the load currents and property of the input signal. A working prototype of the STATCOM is implemented using three-phase VSC and AI control technique based PWM controller approach is developed in MATLAB/SIMULINK.

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Analysis of an H∞ Robust Control for a Three-Phase Voltage Source Inverter

Inventions ◽

10.3390/inventions4010018 ◽

2019 ◽

Vol 4 (1) ◽

pp. 18

Author(s):

Muhammad Rasool ◽

Muhammad Khan ◽

Zahoor Ahmed ◽

Muhammad Saeed

Keyword(s):

Robust Control ◽

Power Quality ◽

Control Strategies ◽

Harmonic Distortion ◽

Control Technique ◽

Voltage Source ◽

Current Loop ◽

Three Phase ◽

Control Scheme

Recently, power quality improvement has gained a lot of attention due to the rapidly increasing use of power electronics equipment. Several control strategies for DC/AC Voltage Source Inverters (VSI) have been developed to obtain good quality output with low harmonic distortion. This paper proposes a robust control scheme to improve the power quality of a three-phase DC/AC VSI. The control scheme includes an outer voltage loop and an inner current loop, with both controllers designed by the standard H∞ robust control technique. The system with the proposed controller has a low total harmonic distortion (THD) and improved power quality of output voltage in the presence of linear and non-linear loads. The simulation is carried out in MATLAB/Simulink environment, and the results of the proposed control scheme are compared with the performance of dead-beat (DB) predictive control and conventional proportional integral (PI) control. It is observed from the results that the proposed control scheme outperforms other control schemes in terms of the THD level, having a better steady-state and transient performance.

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An Advanced Control Technique for Power Quality Improvement of Grid-Tied Multilevel Inverter

Sustainability ◽

10.3390/su13020505 ◽

2021 ◽

Vol 13 (2) ◽

pp. 505

Author(s):

Sumaya Jahan ◽

Shuvra Prokash Biswas ◽

Md. Kamal Hosain ◽

Md. Rabiul Islam ◽

Safa Haq ◽

...

Keyword(s):

Power Quality ◽

Harmonic Distortion ◽

Multilevel Inverter ◽

Control Technique ◽

Solar Pv ◽

Pv System ◽

Reference Tracking ◽

Proportional Integral ◽

Lead Compensator ◽

Power Quality Improvement

The use of different control techniques has become very popular for controlling the performance of grid-connected photovoltaic (PV) systems. Although the proportional-integral (PI) control technique is very popular, there are some difficulties such as less stability, slow dynamic response, low reference tracking capability, and lower output power quality in solar PV applications. In this paper, a robust, fast, and dynamic proportional-integral resonance controller with a harmonic and lead compensator (PIR + HC + LC) is proposed to control the current of a 15-level neutral-point-clamped (NPC) multilevel inverter. The proposed controlled is basically a proportional-integral resonance (PIR) controller with the feedback of a harmonic compensator and a lead compensator. The performance of the proposed controller is analyzed in a MATLAB/Simulink environment. The simulation result represents admirable performance in terms of stability, sudden load change response, fault handling capability, reference tracking capability, and total harmonic distortion (THD) than those of the existing controllers. The responses of the inverter and grid outlets under different conditions are also analyzed. The harmonic compensator decreases the lower order harmonics of grid voltage and current, and the lead compensator provides the phase lead. It is expected that the proposed controller is a dynamic aspirant in the grid-connected PV system.

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Power Quality Improvement using D-STATCOM with Instantaneous Symmetrical Component Theory

International Journal of Engineering and Advanced Technology - Regular Issue ◽

10.35940/ijeat.c6410.049420 ◽

2020 ◽

Vol 9 (4) ◽

pp. 1263-1266

Keyword(s):

Quality Improvement ◽

Power Quality ◽

Control Technique ◽

Voltage Sag ◽

Matlab Simulink ◽

Voltage Dip ◽

Component Theory ◽

Symmetrical Component ◽

Power Quality Improvement ◽

Static Compensator

A technique is introduced to improve the voltage sag under sudden changes in load. The proposed technique is implemented by D-STATCOM (Distribution static compensator) and it is controlled by ISCT (Instantaneous Symmetrical Component Theory). Due to sudden changes in load, the voltage dip occurs at the time of switching of loads. At this time, the control technique generates reference currents and hysteresis block compares these currents with the reference currents and generates the pulses to D-STATCOM. Implementation of system along with compensation is carried out in MATLAB/SIMULINK

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Multilevel UPQC Fed Grid Connected Hybrid System for Sag and Swell Mitigation

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.b1287.0982s1119 ◽

2019 ◽

Vol 8 (2S11) ◽

pp. 2452-2458

Keyword(s):

Power Quality ◽

Hybrid System ◽

Harmonic Distortion ◽

Multilevel Converter ◽

Power Electronic Converters ◽

Power Devices ◽

Effective Utilization ◽

Custom Power ◽

System Power

This paper presents the cascade multilevel UPQC for sag and swell mitigation of a grid connected hybrid system. Power quality is the major problem facing by today’s power system. Due to the use of power electronic converters and devices the harmonics are injected into the grid that may result in grid failure. To mitigate these harmonics custom power devices are used. UPQC is the custom power devise that is used in this paper. The seven level cascade multilevel converter is used for both the series and shunt inverters of UPQC for better harmonic distortion. This system is connected to the PV+WIND hybrid system to provide effective utilization of the resources. The UPQC contains a DC link which controls the Sag and Swell, LG Fault and improves the power quality of the system. This system is simulated in MATLAB/SIMULINK

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Power Quality Improvement by Reduction of Total Harmonic Distortion (THD) using PWM Inverter

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.a5081.129219 ◽

2020 ◽

Vol 9 (2) ◽

pp. 1641-1643

Keyword(s):

Quality Improvement ◽

Power Quality ◽

Harmonic Distortion ◽

Total Harmonic Distortion ◽

Nonlinear Loads ◽

Pwm Inverter ◽

System A ◽

Power Quality Improvement ◽

Simulation Results ◽

And Performance

In this paper, a PWM inverter is proposed for improvement of power quality i.e., reduction of total harmonic distortion (THD). The power quality problems reduce the lifetime and performance of equipments. The proposed system reduces the THD which is generated from the nonlinear loads. Because presence of harmonics leads to problems like overheating, failure of insulation etc. Here the simulation results of the proposed system is studied using MATLAB SIMULINK. Using the system, a lower THD is achieved which shows the effectiveness of the system.

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Predictive Based Dstatcom and UPQC for Power Quality Advancement in Microgrids

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.b1069.078219 ◽

2019 ◽

Vol 8 (2) ◽

pp. 4950-4955

Keyword(s):

Power Quality ◽

Predictive Control ◽

Control Method ◽

Control Technique ◽

Power Devices ◽

Software Comparison ◽

Predictive Controller ◽

Power Quality Conditioner ◽

Static Compensator ◽

Custom Power

Article describes about the improvisation of power quality using Distribution static compensator and Unified power quality conditioner in microgrid. The control method used for the elimination of problems, is predictive control technique. Controller is added in the Microgrid system with three renewable sources. Filters are also added to the system to mitigate the harmonics. The two custom power devices are modeled with model predictive controller [MPC] and made to control separately the existing Microgrid system. The results are taken and compared in both Microgrid modes of operation. The output is documented using MATLAB/Simulink software. Comparison is shown differently and harmonics values are reduced.

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Power Quality Assessment in a Distribution Network

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.62-64.53 ◽

2009 ◽

Vol 62-64 ◽

pp. 53-59 ◽

Cited By ~ 1

Author(s):

B.A. Adegboye

Keyword(s):

Quality Assessment ◽

Power Quality ◽

Power Factor ◽

Textile Industry ◽

Distribution Network ◽

Harmonic Distortion ◽

Three Phase ◽

Blue Phases ◽

Power Quality Disturbances

The paper explores power quality disturbances on a specified section of the distribution network of a Textile Industry in Kaduna State of Nigeria. The 33kV PHCN incoming to the industry is stepped down to 11kV by a 7.5MVA, 33/11kV three-phase transformer. This transformer supplies various 11/.415kV transformers present in the distribution network. Another 11kV PHCN incoming is used in event of any failure from the 33/11kV transformer. The paper focuses on Transformer No. 1, a 150kVA, 11/.415kV three-phase transformer operating at 0.9 power factor, located at printing and dying (P/D) building 1. Majority of the loads on it are inductive. Measurements were taken at the secondary terminal of this transformer by the use of the Harmonitor 3000 power analyzer, which generates the voltage and current waveforms, power factor, voltage and current total harmonic distortion and the apparent power of the red, yellow and blue phases of the transformer. Analyses of these data reveal the disturbances due to harmonics in the phases and neutral of the transformer. The effect of the harmonic current is seen as poor power factor of the transformer. Considering the observations and analyses of the power quality of the transformer 1 (P/D), the paper proposes some recommendations for improving the power quality of the distribution network under study.

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Power Quality Improvement of Isolated Power System Network using UPQC

International Journal of Recent Technology and Engineering - 2 ◽

10.35940/ijrte.e6209.018520 ◽

2020 ◽

Vol 8 (5) ◽

pp. 1962-1969

Keyword(s):

Quality Improvement ◽

Power System ◽

Power Quality ◽

Reactive Power ◽

Harmonic Distortion ◽

Unit Vector ◽

Electrical Network ◽

Alphabetical Order ◽

Power Quality Improvement

The Unified Power Quality Controller (UPQC) is the Custom Power device designed for improving the power quality of the electrical network. In this paper, we proposed UPQC design for an isolated power system network to attend both voltage and current distortion by using Unit Vector template algorithm and Instantaneous Reactive Power theory. Also UPQC is designed for the hybrid generation with Hysteresis control algorithm. The power quality improvement of the power system network is the main aim . The performance analysis is done by comparing its Total Harmonic Distortion (THD). Based on its THD the quality of the power at the “Point of common coupling (PCC)”with and without compensator is quantified in this paper. Keywords : About four key words or phrases in alphabetical order, separated by commas.

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A Distribution Static Compensator Using a CFNN-AMF Controller for Power Quality Improvement and DC-Link Voltage Regulation

Energies ◽

10.3390/en11081996 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1996 ◽

Cited By ~ 2

Author(s):

Kuang-Hsiung Tan ◽

Faa-Jeng Lin ◽

Chao-Yang Tsai ◽

Yung-Ruei Chang

Keyword(s):

Power Quality ◽

Fuzzy Systems ◽

Learning Algorithm ◽

Harmonic Distortion ◽

Voltage Regulation ◽

Learning Ability ◽

Fuzzy Neural ◽

Power Quality Improvement ◽

Online Learning Algorithm ◽

Static Compensator

A distribution static compensator (DSTATCOM) is proposed in this study to improve the power quality, which includes the total harmonic distortion (THD) of the grid current and power factor (PF), of a mini grid with nonlinear and linear inductive loads. Moreover, the DC-link voltage regulation control of the DSTATCOM is essential especially under load variation conditions. Therefore, to improve the power quality and keep the DC-link voltage of the DSTATCOM constant under the variation of nonlinear and linear loads effectively, the traditional proportional-integral (PI) controller is substituted with a new online trained compensatory fuzzy neural network with an asymmetric membership function (CFNN-AMF) controller. In the proposed CFNN-AMF, the compensatory parameter to integrate pessimistic and optimistic operations of fuzzy systems is embedded in the CFNN. Furthermore, the dimensions of the Gaussian membership functions are directly extended to AMFs for the optimization of the fuzzy rules and the upgrade of learning ability of the networks. In addition, the network structure and online learning algorithm of the proposed CFNN-AMF are introduced in detail. Finally, the effectiveness and feasibility of the DSTATCOM using the proposed CFNN-AMF controller to improve the power quality and maintain the constant DC-link voltage under the change of nonlinear and linear inductive loads have been demonstrated by some experimental results.

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