Publications
REACTIVE POWER ENHANCEMENT OF DFIG BASED ON STATCOM FOR GENERATION OF WIND ENERGY
Mar 1, 2025Journal DIAGNOSTYKA, 2025, Vol. 26, No. 1
Publisher Ahmed A. Abdullah AL-KARAKCHI 2
DOI 4. https://doi.org/10.29354/diag/201471.
Issue e-ISSN 2449-5220
Volume , 2025, Vol. 26, No. 1
The rising significance of wind energy integration in power systems is attributed to its economic advantages. The utilization of Doubly Fed Induction Generators (DFIG) in wind energy is increasingly prevalent thanks to its inherent advantages. These include the ability to operate at variable speeds and autonomously control both active and reactive power, outperforming traditional generators. However, challenges arise when integrating such wind farms with the grid, manifesting as voltage stability issues and grid disturbances. These stem from DFIG's inadequate terminal voltage and frequency regulation, primarily due to insufficient excitation and resulting reactive power shortages. Therefore, enhancing terminal voltage and frequency generation is imperative. In this study, we aim to boost DFIG's performance by augmenting its reactive power through STATCOM, addressing supply voltage and frequency reductions caused by varying loads. Additionally, a neuro-fuzzy logic controller is employed to regulate generated voltage and frequency within the dynamic DFIG-STATCOM-load model, simulated using MATLAB/SIMULINK
Active and reactive energy storage STATCOM distribution system power management
Mar 1, 2024Journal International Journal of Power Electronics and Drive Systems (IJPEDS)
DOI DOI: 10.11591/ijpeds.v15.i1.pp268-277
Issue ISSN: 2088-8694,
Volume vol. 15, No. 1
One of the critical factors influencing the overall development of modern power systems is the control of active and reactive power flows in distribution power systems. The static synchronous compensator (STATCOM) with storage energy is a powerful device that can control active and reactive power flow in a distribution system. A simulation model of power management using STATCOM with energy storage is presented in this paper. A fuzzy logic controller is proposed to manage the powers. The simulation results demonstrate STATCOM's ability to manage the active and reactive power flow in a controlled distribution line, and thus the powers regulated between feeders, by utilizing storage energy.
High impedance Fault Detection in Low Voltage Overhead Distribution based Wavelet and Harmonic Indices
Jul 1, 2023Journal PRZEGLĄD ELEKTROTECHNICZNY,, R. 99 NR 7/2023
DOI doi:10.15199/48.2023.07.45
Issue ISSN 0033-2097
. High-impedance fault HIF occurs when an energized conductor makes contact with a surface with a high impedance. Conventional overcurrent protection cannot detect this fault due to the low fault current, and there is no effective protection for HIFs. This paper introduces a novel method for detecting HIFs in low voltage distribution systems by decomposing neutral current using Wavelet and FFT. Modeling HIF fault data in Matlab to analyze the proposed scheme. Simulations demonstrate that the proposed method can accurately detect HIF and distinguish it. Streszczenie. Błąd wysokiej impedancji HIF występuje, gdy przewodnik pod napięciem styka się z powierzchnią o wysokiej impedancji. Konwencjonalne zabezpieczenie nadprądowe nie jest w stanie wykryć tej usterki z powodu niskiego prądu zwarciowego i nie ma skutecznej ochrony dla HIF. W artykule przedstawiono nowatorską metodę wykrywania HIF w systemach dystrybucji niskiego napięcia poprzez dekompozycję prądu neutralnego za pomocą funkcji Wavelet i FFT. Modelowanie danych o błędach HIF w Matlabie w celu analizy proponowanego schematu. Symulacje pokazują, że proponowana metoda może dokładnie wykrywać i rozróżniać HIF. (Wykrywanie uszkodzeń o wysokiej impedancji w niskonapięciowej dystrybucji napowietrznej w oparciu o wskaźniki falkowe i harmoniczne )
Dynamic Voltage Restorer for Voltage Unbalance Mitigation and Voltage Profile Improvement in Distribution Network
Jun 1, 2023Journal PRZEGLĄD ELEKTROTECHNICZNY, , R. 99 NR 6/2023
DOI doi:10.15199/48.2023.06.38
Issue ISSN 0033-2097
Unbalanced network voltage damages utility and end-user equipment. Electrified trains, single-phase distributed generators, and line-to line connected industrial loads can increase voltage imbalances. Using Dynamic Voltage Restorer (DVR) at appropriate places is one way to reduce imbalance in practical networks. This research proposes a new technique for managing DVR to improve voltage profile. The simulation results imply that real-time implementation of the suggested controller is practical and resilient. Streszczenie. Niezrównoważone napięcie sieciowe uszkadza sprzęt komunalny i użytkownika końcowego. Zelektryfikowane pociągi, jednofazowe rozproszone generatory i obciążenia przemysłowe połączone między liniami mogą zwiększać nierównowagę napięcia. Używanie dynamicznego przywracania napięcia (DVR) w odpowiednich miejscach jest jednym ze sposobów zmniejszenia asymetrii w praktycznych sieciach. Badanie to proponuje nową technikę zarządzania DVR w celu poprawy profilu napięcia. Wyniki symulacji sugerują, że implementacja sugerowanego kontrolera w czasie rzeczywistym jest praktyczna i odporna. (Dynamiczny przywracacz napięcia do ograniczania asymetrii napięcia i poprawy profilu napięcia w sieci dystrybucyjnej) Keywords: DVR, Voltage unbalance, voltage profile, p-q Theory, Fuzzy Logic. Słowa kluczowe: nierównowaga napięć, dynamiczne przywracanie napięciea.
Design and Implementation of an Automated Residential Water Heating System using Sustainable Energy and PLC Techniques
Nov 22, 2020Journal Journal of Engineering and Applied Sciences
Publisher Hassaan Th. H. Thabet and Zozan Saadallah Hussaina al-jarjaree
Issue ISSN: 1816-949X
Volume 15 (5): 1244-1250, 2020
The objective of this study is to design a control system for the provision of water and hot water around the clock for people living in difficult times and abnormal conditions in their residential areas using solar energy as sustainable and free energy and water of wells. This study was accomplished during the severe electricity crisis that occurred in the city of Mosul/Iraq in the Winter of 2014 where the electricity supply to the city by the National Electricity Authority NEA does not exceed 2 h for every 72 h and the temperature of the atmosphere varies between -3 and 14°C and semi-disappearance of other sources of energy such as oil, cooking gas and gasoline as well as the interruption of water supply by the government water purification plant as a result of the electrical power cuts. The best solution was to take advantage of solar water heating and private generators (the Zone Generators, ZG) in the area which supply a number of houses (3 h ON/3 h OFF) throughout the day. The LOGO!® V7.0 programmable logic controller from SIEMENS of Germany was used to control this system which consists of 1-the main electric water heater (Capacity 220 Ls). The auxiliary electric water heater (Capacity 30 L) for emergency cases. The solar heater which consists of two flat bed panels to collect solar radiation with a heat exchange tank (Capacity 180 L). The electrical control valves (Coil voltage 12 VDC). The main water storage tank at the top of the house (Capacity 1100 L) that is equipped with water either by the government water purification plant or by the water of the well in the case of the interruption of the first source using a water pump that will supply the main tank with water when needed. The solar electric cell that charges-in emergency cases-the battery which supplies the controller, sensors and actuators to ensure the sustainability of the operation of the control system, even in the complete absence of electricity. The test period of this system was from 1/10/2014 until 1/6/2015. The results of the test were good, especially, during the cold season during the month of January, 2014.
Damping The Inrush Current for Current Transformer
May 3, 2020DOI DOI: 10.11591/ijpeds.v15.i1.pp268-277
According to the instant at which the voltage is applied and the remanent flux of the magnetic circuit a transient overcurrent may be produced when the transformer is energized. This transient magnetizing current is called the inrush current. This current is extremely asymmetric and arising from the saturation of a transformer core as a result of excessive growth of a magnetic flux only in one direction. Inrush currents have an important concern to the power studies because these large inrush currents impair the transformer lifetime, produce mechanical stress to the transformer and may cause protection system malfunction. So, there is a necessity to reduce or damp (if possible) the inrush current to protect the transformer, prevent the mal operation of the system protection and override the other consequences of the inrush current. There are different strategies to reduce such inrush currents have been developed. These strategies like inserting current limiting elements such as resistors or reactors in series to the transformer windings, or, by inserting a voltage source inverter (VSI) controlled as a dynamic resistor in series or in shunt or by core flux manipulation. The aid in this current paper, is damping not reducing the inrush current. So, based on simulations in MATLAB, the suggested strategy is adding an inductor in parallel with the circuit breaker (C.B., which has very low resistance when it is closed) at different values of the adding inductor to determine the suitable range values of inductor to damp the probable inrush current.
Investigation of Using Methane in Generating Electricity for supplying the Grid in Kirkuk Governorate
Feb 4, 2018Journal Jour of Adv Research in Dynamical & Control Systems
Publisher Alya H. Al-RifaieAlya H. Al-RifaieFadya al-jarjareeFadya al-jarjaree
Volume Vol. 10, 06-Special Issue, 2018
The expansion of various activities in major cities in recent years, the economic and socialdevelopments, and the emergence of new patterns and special practices led to the increase and diversity ofhuman demands. This was accompanied by increasingly huge amounts of waste, which lead to the pollution ofenvironment with harmful materials. As a result, specialists began to focus on the exploitation of these wastes ina way that serves the environment such as producing biogas from the anaerobic digestion of organic wastes inlandfills. Recently, there was a trend to exploit renewable energies in supplying houses with power. In thisresearch, the quantity of methane gas produced from the landfill area was evaluated by a virtual method andexploited in the production of electric energy. In addition, the research studied the possibility of supplying thecity of Kirkuk with electric power using a methane-operated system as a helping power station. The mainsystem was simulated by using MATLAB (19) (PDF) Investigation of Using Methane in Generating Electricity for supplying the Grid in Kirkuk Governorate. Available from: https://www.researchgate.net/publication/341001622_Investigation_of_Using_Methane_in_Generating_Electricity_for_supplying_the_Grid_in_Kirkuk_Governorate#fullTextFileContent [accessed Sep 30 2025].