scholarly journals Modified Recursive Least Square Algorithm for THD Reduction using Shunt Active Power Filter in Grid

2019 ◽  
Vol 5 (2) ◽  
pp. 8
Author(s):  
Divya Prabha ◽  
Lalit Jain
Keyword(s):  
Power System ◽  
Power Quality ◽  
Reactive Power ◽  
Active Power ◽  
Active Filters ◽  
Least Square ◽  
Recursive Least Square ◽  
Nonlinear Loads ◽  
Shunt Active Power Filter ◽  
Active Power Filters

In industrial and utility power system it has been observed that harmonics build a major role in reducing the quality of power. These harmonics are caused because of increasingly utilize of nonlinear loads connected to the power system. In this context, active power filters play a very significant role for improvement in power quality. Moreover, at transmission ground, there is a high requirement to control reactive power and voltage stability. Conventionally, passive and active filters (shunt and series filters) were used for the development of power quality. But, they suffered from the issues like resonance, fixed compensation, and other heating networks are commonly addressed in the literature as one of the most effective solutions for decreasing the designed.

scholarly journals Mitigation of Harmonics in Three - Phase Three - Wire System by using Fuzzy Logic Controlled Shunt Active Filters

2020 ◽  
Vol 6 (11) ◽  
pp. 87-91
Author(s):  
Goggi Kirshna Sanyasi Rao and P.Murari
Keyword(s):  
Reactive Power ◽  
Control Strategies ◽  
Pi Controller ◽  
Active Power ◽  
Active Filters ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Active Power Filters ◽  
Power Filters ◽  
Synchronous Reference Frame

This paper shows the method of improving the power quality using shunt active power filter. In order to protect the supply system from current harmonics, we have to use the active power filters. These are used to compensate the reactive power compensation, but the performance of active power filters are based on various control strategies. This paper presents the complete examination to estimate the working of SHAF for generating the current references under steady and transient for balanced, unbalanced and non-sinusoidal conditions by using PI controller. The P-Q theory and synchronous reference frame theory, which are widely used in SHAF. The most validate results obtained by simulation with matlab/simulink software are carried out with PI controller for P-Q control theory for various voltage conditions like balanced, unbalanced and non-sinusoidal conditions and dynamic load changes.

scholarly journals Modeling and Simulation of a PI Controlled Shunt Active Power Filter for Power Quality Enhancement Based on P-Q Theory

Electronics ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 637 ◽  
Author(s):  
Amir A. Imam ◽  
R. Sreerama Kumar ◽  
Yusuf A. Al-Turki
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Active Power Filter ◽  
Active Power ◽  
Current Control ◽  
Voltage Source ◽  
Quality Enhancement ◽  
Nonlinear Loads ◽  
Shunt Active Power Filter ◽  
Power Filter

The design of reliable power filters that mitigate current and voltage harmonics to meet the power quality requirements of the utility grid is a major requirement of present-day power systems. In this paper, a detailed systematic approach to design a shunt active power filter (SAPF) for power quality enhancement is discussed. A proportional–integral (PI) controller is adopted to regulate the DC-link voltage. The instantaneous reactive power theory is employed for the reference current’s extraction. Hysteresis current control is used to obtain the gate pulses that control the voltage source inverter (VSI) switches. The detailed SAPF is developed and simulated for balanced nonlinear loads and unbalanced nonlinear loads using MATLAB/Simulink. The simulation results indicate that the proposed filter can minimize the harmonic distortion to a level below that deployed by the Institute of Electrical and Electronics Engineers (IEEE) standards.

scholarly journals Design and Development of Shunt Active Filter Using MATLAB for Minimization of Harmonics

2018 ◽  
Vol 7 (3.10) ◽  
pp. 179 ◽  
Author(s):  
Ravi Samikannu ◽  
R Rohini ◽  
V Sampath Kumar ◽  
Vitaliy Mezhuyev
Keyword(s):  
Power Quality ◽  
Research Work ◽  
Active Power ◽  
Phase System ◽  
Nonlinear Loads ◽  
Shunt Active Power Filter ◽  
Shunt Active Filter ◽  
Active Power Filters ◽  
Power Filters ◽  
Sinusoidal Current

Nonlinear loads draw non sinusoidal current and voltage from the utility. These non-sinusoidal current and voltages created due to nonlinear loads are called harmonics. The harmonic voltage and current disturbs the system back and creates big power quality problem. Therefore in order to mitigate harmonic problems different mechanisms are used. In this work as introduction different power quality problems, harmonics and their mitigation techniques/filters are presented and discussed. Between the different ways to minimize/eliminate harmonics active power filters are most Prominent one. This research work presents three phase system shunt active power filter working based on PQ theory. MATLAB simulation used and results are discussed.  

scholarly journals Improving Power Quality by a Four-Wire Shunt Active Power Filter: A Case Study

Energies ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1951
Author(s):  
Mihaela Popescu ◽  
Alexandru Bitoleanu ◽  
Mihaita Linca ◽  
Constantin Vlad Suru
Keyword(s):  
Power Quality ◽  
Quality Indicators ◽  
Reactive Power ◽  
Control Method ◽  
Active Power Filter ◽  
Active Power ◽  
Current Control ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Unbalanced Load

This paper presents the use of a three-phase four-wire shunt active power filter to improve the power quality in the Department of Industrial Electronics of a large enterprise from Romania. The specificity is given by the predominant existence of single-phase consumers (such as personal computers, printers, lighting and AC equipment). In order to identify the power quality indicators and ways to improve them, an A-class analyzer was used to record the electrical quantities and energy parameters in the point of common coupling (PCC) with the nonlinear loads for 27 h. The analysis shows that, in order to improve the power quality in PCC, three goals must be achieved: the compensation of the distortion power, the compensation of the reactive power and the compensation of the load unbalance. By using the conceived three-leg shunt active power filter, controlled through the indirect current control method in an original variant, the power quality at the supply side is very much improved. In the proposed control algorithm, the prescribed active current is obtained as a sum of the loss current provided by the DC voltage and the equivalent active current of the unbalanced load. The performance associated with each objective of the compensation is presented and analyzed. The results show that all the power quality indicators meet the specific standards and regulations and prove the validity of the proposed solution.

Adaptive Method for Power Quality Improvement through Minimization of Harmonics Using Artificial Intelligence

2017 ◽  
Vol 8 (1) ◽  
pp. 470 ◽  
Author(s):  
P. Thirumoorthi ◽  
Raheni T D
Keyword(s):  
Artificial Intelligence ◽  
Power System ◽  
Power Quality ◽  
Active Power Filter ◽  
Pi Controller ◽  
Active Power ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Non Linear ◽  
Source Current

Power system harmonics are a menace to electric power system with disastrous consequence. Due to the presence of non linear load, power quality of the system gets affected.  To overcome this, shunt active power filter have been used near harmonic producing loads or at the point of common coupling to block current harmonics. The shunt active power filter is designed to minimize harmonics in source current and reactive power in the non linear power supplies which are creating harmonics. In this paper, Instantaneous power of p-q theory is employed to generate the reference currents and PI controller is used to control the dc link voltage. In addition to this, Artificial Intelligence (AI) technique is used to minimize the harmonics produced by nonlinear load. The main objective of this paper is to analyze and compare THD of the source current with PI controller and by artificial neural network based back propagation algorithm. The proposed system is designed with MATLAB/SIMULINK environment.

scholarly journals Hysteresis Control for Shunt Active Power Filter under Unbalanced Three-Phase Load Conditions

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Z. Chelli ◽  
R. Toufouti ◽  
A. Omeiri ◽  
S. Saad
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Active Power Filter ◽  
Active Power ◽  
Harmonic Suppression ◽  
Nonlinear Loads ◽  
Shunt Active Power Filter ◽  
Power Filter ◽  
Three Phase ◽  
Control Scheme

This paper focuses on a four-wire shunt active power filter (APF) control scheme proposed to improve the performance of the APF. This filter is used to compensate harmonic distortion in three-phase four-wire systems. Several harmonic suppression techniques have been widely proposed and applied to minimize harmonic effects. The proposed control scheme can compensate harmonics and reactive power of the nonlinear loads simultaneously. This approach is compared to the conventional shunt APF reference compensation strategy. The developed algorithm is validated by simulation tests using MATLAB Simulink. The obtained results have demonstrated the effectiveness of the proposed scheme and confirmed the theoretical developments for balanced and unbalanced nonlinear loads.

Active Power Control of Grid Tied SPV System with DSTATCOM Capabilities

2017 ◽  
Vol 18 (3) ◽  
Author(s):  
Ikhlaq Hussain
Keyword(s):  
Power Control ◽  
Power Quality ◽  
Solar Power ◽  
Reactive Power ◽  
Active Power ◽  
Least Square ◽  
Solar Irradiation ◽  
Power Demand ◽  
Least Mean Square ◽  
Active Power Control

AbstractThis paper presents an active power control of SPV (Solar Photovoltaic) grid tied system with the DSTATCOM (Distribution Static Compensator) capabilities using recursive least square (RLS) control algorithm with IC (Incremental Conductance) maximum power point tracking. The system serves dual purpose of working as a SPV-DSTATCOM and DSTATCOM in presence and absence of solar power, respectively. The SPV-DSTACOM provides compensating currents along with active current component thus fulfilling active power demand of connected load and feeds active power to the grid along with improving the power quality. Moreover, when the solar power is not available during night or low solar irradiation conditions, the system works as a DSTATCOM providing compensating current which improves the power quality of the system during load unbalance, harmonics and reactive power. A RLS based adaptive algorithm is used to do these functions at good convergence than conventional LMS (Least Mean Square) algorithm. Thus, the proposed system is capable to meet peak power demand when the solar energy is available and it improves the system power quality during day and night. The system responses under varying conditions is demonstrated on s developed prototype.

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