scholarly journals Total Harmonic Distortion Reduction for Power Quality Improvement: A Review

2017 ◽  
Vol 6 (7) ◽  
pp. 1681-1684
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Harmonic Distortion ◽  
Total Harmonic Distortion ◽  
Power Quality Improvement ◽  
Distortion Reduction

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

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.

scholarly journals A novel control strategy for power quality improvement in grid-connected solar photovoltaic system

2019 ◽  
Vol 15 (3) ◽  
pp. 1264
Author(s):  
Pankaj Gakhar ◽  
Manoj Gupta
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Control Strategy ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Pi Controller ◽  
Current Control ◽  
Total Harmonic Distortion ◽  
Solar Photovoltaic ◽  
Power Quality Improvement

<p>In this paper, a novel and dynamic, current control based inverter control strategy has been used for energy optimization and power quality improvement in a grid-connected solar photovoltaic plant using a PI controller. The output of the plant is delivered to the grid passing through a boost converter controlled by an MPPT controller and an inverter. The control strategy proposed offers the flexibility to keep control of active as well as reactive power being injected straight into the grid and also helps in mitigating the total harmonic distortion levels. Also, the effect of the conventional PI controller and PI controller optimized through Genetic Algorithm has been compared. The GA-PI controller has been found effective in reducing the Total Harmonic Distortion in the current injected in the grid. The effectiveness of the work has been observed by using a MATLAB/SIMULINK environment.</p>

scholarly journals Power Quality Improvement through a UPQC and a Resonant Observer-Based MIMO Control Strategy

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6938
Author(s):  
Holman Bueno-Contreras ◽  
Germán Andrés Ramos ◽  
Ramon Costa-Castelló
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Control Strategy ◽  
Closed Loop ◽  
Mimo Systems ◽  
Control Strategies ◽  
Harmonic Distortion ◽  
Phase System ◽  
Coupling Effects ◽  
Power Quality Improvement

Performance degradation is, in general, regarded as a power quality problem. One solution to recover grid performance is through the application of a unified power quality conditioner (UPQC). Although these devices are multi-input/multi-output (MIMO) systems, the most common control strategies consist of two decoupled controllers, which neglect the coupling effects and add uncertainty to the system. For this reason, this paper proposes a multivariable resonant observer-based control strategy of a UPQC system. This method includes all significant coupling effects between this system and the grid. This strategy results in a stability-based compensator, which differs from recently proposed strategies that are based on signal calculation and cannot assure closed-loop stability. In addition, this paper introduces a simplified controller tuning strategy based on optimal conventional methods without losing closed-loop performance. It implies that the controller can be easily tuned, despite the complexity of the MIMO dynamic model. The UPQC with the resonant observer is verified on an experimental setup for a single-phase system, obtaining three relevant results for power quality improvement: (1) harmonics compensation tested with a total harmonic distortion limit of 5%; (2) sags and swells mitigation; and (3) power factor correction, achieving a unitary value on the grid side.

scholarly journals Fuzzy with Hysteresis Controller for Power-Quality Improvement of Grid Interconnected System

2020 ◽  
Vol 9 (3) ◽  
pp. 4059-4062
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Distribution Systems ◽  
Harmonic Distortion ◽  
Voltage Sag ◽  
Interconnected System ◽  
Logic Control ◽  
Unbalanced Voltage ◽  
Hysteresis Controller ◽  
Power Quality Improvement

The grid connected distribution systems are providing the energy to the load from the grid. During the period of energy transmission, the issues are occurred on the power quality in transmission line. In the power system, the power quality issues are occurred due to the following issues as instability of the system, voltage sag, harmonic distortion, over voltage, unbalanced voltage etc. In this paper, the power quality improvement is designed using the inverter which compensates the voltage and current when the fault occurred. This inverter is used to inject the power using a DC source. This improvement of power quality is controlled by the hysteresis controller with fuzzy logic control. The feedback is given to the controller which reduces the error from the system and provides the control variables to the inverter terms of switching gate signals.

Study of delta/polygon-connected transformer-based 36-pulse ac-dc converter for power quality improvement

2012 ◽  
Vol 61 (2) ◽  
pp. 277-292 ◽  
Author(s):  
Rohollah Abdollahi
Keyword(s):  
Quality Improvement ◽  
Power Quality ◽  
Harmonic Distortion ◽  
Design Procedure ◽  
Quality Indices ◽  
Unity Power Factor ◽  
Wide Range ◽  
Bridge Rectifier ◽  
Power Quality Improvement ◽  
Point Of Common Coupling

Study of delta/polygon-connected transformer-based 36-pulse ac-dc converter for power quality improvementDesign of a delta/polygon-connected autotransformer based 36-pulse ac-dc converter is presented in this paper. The 36-pulse topology is obtained via two paralleled eighteen-pulse ac-dc converters each of them consisting of a nine-phase (nine-leg) diode bridge rectifier. For independent operation of paralleled diode-bridge rectifiers, two interphase transformers (IPT) is designed and implemented. A transformer is designed to supply the rectifier. The design procedure of magnetics is in a way such that makes it suitable for retrofit applications where a six-pulse diode bridge rectifier is being utilized. The proposed structure has been implemented and simulated using Matlab/Simulink software under different load conditions. Simulation results confirmed the significant improvement of the power quality indices (consistent with the IEEE-519 standard requirements) at the point of common coupling. Furthermore, near unity power factor is obtained for a wide range of DTCIMD operation. A comparison is made between 6-pulse and proposed converters from view point of power quality indices. Results show that input current total harmonic distortion (THD) is less than 4% for the proposed topology at variable loads.

scholarly journals Power Quality Improvement of Isolated Power System Network using UPQC

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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