scholarly journals Reactive Power and Current Harmonic Control Using a Dual Hybrid Power Filter for Unbalanced Non-Linear Loads

Energies ◽  
2018 ◽  
Vol 11 (6) ◽  
pp. 1392 ◽  
Author(s):  
Leonardo Rodrigues Limongi ◽  
Fabricio Bradaschia ◽  
Calebe Hermann de Oliveira Lima ◽  
Marcelo Cabral Cavalcanti
Keyword(s):  
Reactive Power ◽  
Active Filters ◽  
Nonlinear Loads ◽  
Harmonic Compensation ◽  
Current Harmonics ◽  
Current Harmonic ◽  
Electrical Grid ◽  
Hybrid Power ◽  
Quality Issue ◽  
Non Linear

An important power quality issue is related to current harmonic components demanded by non-linear loads. A solution to mitigate this issue is to use hybrid power filters (HPFs), that apply low power active filters with passive filters. Some dual-converter topologies have been shown to be attractive due to a better compensation performance compared with single filters, where the HPFs give a reactive power support (an extra feature) together with harmonic compensation. On the other hand, the drawback of dual converters is the high number of active switches. Besides that, due to the high number of unbalanced non-linear loads connected to the electrical grid, triplen harmonics can appear. However, traditional HPFs do not compensate triplen harmonics, which usually have considerable values. Therefore, in this paper, a dual HPF based on the nine-switch inverter (DHPF-NSI) is proposed to compensate current harmonics and to provide reactive power support. The NSI presents a reduced number of switches when compared with classical dual topologies. The compensation of the third harmonic caused by unbalanced nonlinear loads was also inserted in the control system. Experimental results are presented for the DHPF-NSI in order to demonstrate the reactive power and harmonic compensation performances.

scholarly journals Reactive power and harmonic compensation: A case study for the coal-mining industry

2019 ◽  
Vol 30 (1) ◽  
pp. 34-48 ◽  
Author(s):  
F. Roos ◽  
R.C. Bansal
Keyword(s):  
Reactive Power ◽  
Mining Industry ◽  
Load Flow ◽  
Nonlinear Loads ◽  
Network Growth ◽  
Harmonic Compensation ◽  
Current Harmonics ◽  
Technology Advancement ◽  
Network Simulations

This study reports on a case study in Grootegeluk Mine: Exxaro Coal, Lephalale, South Africa, in terms of power factor correction (PFC), load flow, harmonic frequency scans and harmonic voltage distortion analyses. The DIgSilent PowerFactory software was used for network simulations. Harmonic and reactive power compensation techniques were compared in terms of filter type evolution and technology advancement, with the use of simple trade-off criteria such as cost-effectiveness versus performance. It was found that both passive and hybrid filters were more favourable and could effectively compensate all voltage and current harmonics and reactive power for large nonlinear loads. The installation of switched PFC filter banks tuned at the fifth harmonic order accommodates future network growth and this solution can be rolled out to any mining industry as a benchmark to lower energy cost and maximise savings achievable on the electricity bill.  

scholarly journals DSTATCOM for Harmonic Mitigation in Distribution Lines using Two-Level Inverter

2019 ◽  
Vol 9 (2) ◽  
pp. 4475-4478
Keyword(s):  
Power Quality ◽  
Distribution System ◽  
Distribution Systems ◽  
Reactive Power ◽  
Nonlinear Loads ◽  
Load Current ◽  
Current Harmonics ◽  
Side Load ◽  
Non Linear ◽  
Power Quality Improvement

Distribution systems have been facing serious problems of harmonics load current mainly due to advancement in power electronic based and other non-linear loads. The DSTATCOM has been widely used to mitigate the load current harmonics problems in distribution system. The power quality improvement is one of the major problems when the distribution side load increases with non-linear loads like electric vehicles, laptops, PCs etc., There are some power quality mitigation technique available at the load side where the electronic chargers works with unity power factor (UPC) control. But many DC loads are connected without the UPC. So, it is a need for a device which corrects the real and reactive power at the distribution level. The DSTATCOM is connected to the Indian distribution system with 415V, 50Hz. In this paper the linear loads and nonlinear loads are coupled to the system and analysis with DSTATCOM and without DSTATCOM cases are presented.

scholarly journals PI Regulator with Tracking Anti-Windup Based Modified Power Balance Theory for SAPF under Unbalanced Grid Voltage Unbalance Non Linear Loads

2019 ◽  
Vol 23 (2) ◽  
Author(s):  
Zellouma Laid ◽  
Khechiba Kamel ◽  
Benaissa Amar
Keyword(s):  
Reactive Power ◽  
Power Balance ◽  
Balance Theory ◽  
Nonlinear Loads ◽  
Shunt Active Power Filter ◽  
Current Harmonics ◽  
Voltage Unbalance ◽  
Pi Regulator ◽  
Power Filter ◽  
Unbalanced Grid

This paper presents a modified power balance theory for extracting the reference compensating currents to shunt active power filter (SAPF) which is applied to illuminate current harmonics and compensate reactive power under unbalanced voltages and unbalancing Nonlinear loads. A new method has been proposed based proportional-integrator (PI) controller with tracking anti-windup protection is presented. The power balance theory is used to establish suitable current reference signals. The studied is carried out with Matlab/Simulink and power system tools to verify the performance of the proposed technique. The filtering method of the SAPF can achieve the THD% limit specified by the IEEE-519 standard.

scholarly journals Selection of C-Type Filters for Reactive Power Compensation and Filtration of Higher Harmonics Injected into the Transmission System by Arc Furnaces

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2330
Author(s):  
Andrzej Grzegorz Lange ◽  
Grzegorz Redlarski
Keyword(s):  
Reactive Power ◽  
Second Harmonic ◽  
Transmission System ◽  
Operating Conditions ◽  
Arc Furnace ◽  
Steel Mill ◽  
Nonlinear Loads ◽  
Higher Harmonics ◽  
Current Harmonics ◽  
Arc Furnaces

This article presents a method for selecting the elements of a C-type filter working with a conventional LC-type filter for compensating reactive power and filtering out higher harmonics generated by arc furnaces and ladle furnaces. The study was conducted in a steel mill supplied by a 110 kV transmission system, where higher harmonic currents and nonlinear loads were measured. A series of computer simulations were performed under various operating conditions, and an algorithm for selecting the parameters of a third-order C-type filter (for suppressing the second harmonic) and two second-order LC-type filters (for suppressing the third harmonic) was proposed. The filtering system was tested in an arc furnace with the highest rated power, and harmonics in the current spectrum were evaluated. The results of the measurements were used to analyze the effectiveness of the compensation system comprising two passive C-type and LC-type filters at different system configurations. C-type filters significantly influenced current harmonics. The influence of the changes in the number of arc furnace transformers on the true Root Mean Square (RMS) of the currents injected into the 110 kV transmission system and on the voltages of the 110 kV busbars was discussed.

scholarly journals Simulation, Design, and Analysis of 3-Level Shunt Active Harmonic Filter using T-Typed NPC (TNPC) Topology

10.29007/s9ch ◽  
2018 ◽  
Author(s):  
Mitrajsinh Janaksinh Chudasama ◽  
Prof. Dr. P. N. Tekwani ◽  
Siddharthsingh K Chauhan ◽  
Vinod Patel
Keyword(s):  
Reactive Power ◽  
Simulation Design ◽  
Current Harmonics ◽  
Synchronous Reference Frame ◽  
Three Phase ◽  
Harmonic Filter ◽  
Non Linear ◽  
Point Of Common Coupling ◽  
Switched Mode Power Supply ◽  
Parallel Resonance

Power quality at the source side deteriorates due to current harmonics which are introduced in the power system by non-linear loads, originating a vital difficulty. Rectifiers, variable speed drive, switched mode power supply, etc. types of non-linear loads create such harmonics. Con- ventional technique to eliminate such harmonics is use of passive filters but this technique has the disadvantage of series and parallel resonance within the network impedance, overcompen- sation of reactive power at fundamental frequency and poor flexibility. Shunt Active Harmonic Filters (SAHF) are generally used to reduce current harmonics. The active harmonic filters introduce remunerating currents into the source to neutralize the harmonics possessed by the load current. The compensating currents will be derived by sensing three-phase voltages at the Point of Common Coupling (PCC) and load currents. Efforts are made in this study to ana- lyze Fast Fourier Transform (FFT) algorithm, Instantaneous Reactive Power (IRP) technique, and Synchronous Reference Frame (SRF) technique used to derive the reference compensating currents. These compensating currents act as reference currents for the fixed switching based current controllers which generate control signals for the SAHF employing three-level T-type Neutral Point Clamped (TNPC) topology of converter.

scholarly journals The Performance of the BTB-VSC for Active Power Balancing, Reactive Power Compensation and Current Harmonic Filtering in the Interconnected Systems

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 831 ◽  
Author(s):  
Janeth Alcalá ◽  
Víctor Cárdenas ◽  
Alejandro Aganza ◽  
Jorge Gudiño-Lau ◽  
Saida Charre
Keyword(s):  
Reactive Power ◽  
Harmonic Distortion ◽  
Reactive Power Compensation ◽  
Active Power ◽  
Performance Criteria ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Current Harmonics ◽  
Current Harmonic ◽  
Harmonic Filtering

Nowadays, the use of power converters to control active and reactive power in AC–AC grid-connected systems has increased. With respect to indirect AC–AC converters, the tendency is to enable the back-to-back (BTB) voltage source converter (VSC) as an active power filter (APF) to compensate current harmonics. Most of the reported works use the BTB-VSC as an auxiliary topology that, combined with other topologies, is capable of active power regulation, reactive power compensation and current harmonic filtering. With the analysis presented in this work, the framework of the dynamics associated with the control loops is established and it is demonstrated that BTB-VSC can perform the three tasks for which, in the reviewed literature, at least two different topologies are reported. The proposed analysis works to support the performance criteria of the BTB-VSC when it executes the three control actions simultaneously and the total current harmonic distortion is reduced from 27.21% to 6.16% with the selected control strategy.

Design and Test Procedures for EMI Filters Used for Nonlinear Loads

2014 ◽  
Vol 792 ◽  
pp. 133-138 ◽  
Author(s):  
Mircea Buzdugan ◽  
Horia Balan
Keyword(s):  
Experimental Model ◽  
Active Filters ◽  
Test Procedures ◽  
Nonlinear Loads ◽  
Pwm Converters ◽  
Non Linear ◽  
Emi Filters ◽  
Filter Solution ◽  
Emi Filter

This paper analyzes an EMI filter solution to diminish the effect of harmonics generated by PWM converters in active filters. Throughout this paper, we have presented specific problems regarding the design, simulation and the validation of the model by testing EMI filters. It can be mentioned that the tests of the experimental model were performed in a laboratory, using existing conditions for the non linear consumer, by generating distorted waveforms.

scholarly journals Four-leg active power filter control with SUI-PI controller

2021 ◽  
Vol 11 (4) ◽  
pp. 2768
Author(s):  
Mohamed M. El-sotouhy ◽  
Ahmed A. Mansour ◽  
Mostafa I. Marei ◽  
Aziza M. Zaki ◽  
Ahmed A. EL-Sattar
Keyword(s):  
Reactive Power ◽  
Control Method ◽  
Current Source ◽  
Active Power Filter ◽  
Industrial Applications ◽  
Active Power ◽  
Active Filter ◽  
Active Filters ◽  
Power Filter ◽  
Non Linear

<span>Four-leg active power filter is considered one of the greatest vital active filters that are frequently used in industrial applications, especially those that need to be controlled in each individual phase. Also, to control the neutral current that created because of a lot of unbalanced and non-linear loads. In this paper, the used active filter was controlled by a proposed control method which can achieve simplicity and intelligence at the same time. The novelty of this paper is using the proposed controller with Four-leg active power filter. This controller relies on instantaneous reactive power theory, which used to create the required currents that are injected into the network via the used active filter to remove the problems created by unbalanced and non-linear loads. It is also maintained that the current source a pure sinusoidal wave. The system is implemented on MATLAB/Simulink. The simulation results proved the preference of the proposed controller than the conventional proportional-integration controller, where it reduced the percentage of total harmonic distortion for the current source<em><span lang="AR-SA" dir="RTL">.</span></em></span>

scholarly journals Intelligent Hybrid-Fuzzy Controller using VLLMS Based Shunt Active Filter

2020 ◽  
Vol 06 (09) ◽  
pp. 215-229
Author(s):  
Shaik Nagul Sharif and Sri Latha Veerla
Keyword(s):  
Power System ◽  
Fuzzy Logic Controller ◽  
Reactive Power ◽  
Fuzzy Controller ◽  
Pi Controller ◽  
Active Filter ◽  
Active Filters ◽  
Nonlinear Load ◽  
Shunt Active Filter ◽  
Non Linear

The power quality problem in the power system is increased with the use of non-linear devices. Due to the use of non-linear devices like power electronic converters, there is an increase in harmonic content in the source current. Due to this there is an increase in the losses, instability and poor voltage waveform. To mitigate the harmonics and provide the reactive power compensation, we use filters. There are different filters used in the power system. Passive filters provide limited compensation, so active filters can be used for variable compensation. In this work, a shunt active filter has been made adaptive using a Variable Leaky Least Mean Square (VLLMS) based controller. Proposed adaptive controller can be able to compensate for harmonic currents, power factor and nonlinear load unbalance. DC capacitor voltage has been regulated at a desired level using a PI controller and a self-charging circuit technique. But, this scheme as two disadvantages such as, tuning issues of current controller pre-requisites the traditional PI controller, which is controlled by intelligent based Hybrid-Fuzzy-Logic controller for achieving good performance features. The design concept of proposed intelligent Hybrid-Fuzzy controller for shunt active filter has been verified through simulation analysis and results are presented with proper comparisons.

Sign in / Sign up

Export Citation Format

Share Document