Electrical power engineering test (1)
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1. The document discusses questions about electrical power engineering topics. It defines abbreviations like PMG, MCB, and RTD. It explains the differences between demand factor and load factor. It discusses the meaning of CT burden = 10 VA and the function of an AVR. 2. Drawings and explanations are provided for speed control of 3 phase induction motors by varying frequency, transformer short circuit testing, and controlling parameters like active power, reactive power and voltage in a power generator. 3. Circuits are drawn for a full wave and half wave 3 phase rectifier for UPS systems. Contactor categories and an earth fault protection circuit for a power transformer are discussed. 4. A circuit is drawn
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Our journal system primarily aims to bring out the research talent and the works done by sciaentists, academia, engineers, practitioners, scholars, post graduate students of engineering and science. This journal aims to cover the scientific research in a broader sense and not publishing a niche area of research facilitating researchers from various verticals to publish their papers. It is also aimed to provide a platform for the researchers to publish in a shorter of time, enabling them to continue further All articles published are freely available to scientific researchers in the Government agencies,educators and the general public. We are taking serious efforts to promote our journal across the globe in various ways, we are sure that our journal will act as a scientific platform for all researchers to publish their works online.
How to conduct the lightning impulse withstand test on 550kv GIS?
Abstract: With the rapid development of power grid in China, an increasing number of GIS are adopted in new substations. The lightning impulse test is recommended after the installation of GIS in order to check its insulation performance and reduce the risk of equipment failure. However, owing to the design and production, common lightning impulse generator with large capacitance load especially GIS cannot generate lightning impulse waveform, which meets the requirement. Therefore, based on lightning impulse withstand test of Three Gorges Right Bank 550kV GIS, models of lightning impulse generator and field equipment are established, and simulation calculation is done. According to the result, a method of installing the inductor in the impulse circuit is put forward to generate oscillating lightning impulse which meets the requirement of the test. This method is successfully applied in the test and results are good. Valuable experience has been accumulated for the lightning impulse test on GIS of 750kV, 1000kV substations in China. (http://www.himalayal.com/Impulse-Generator/HowtoConductLightningImpulseTestOnGIS.html)
E044043336
This document presents a new voltage sag compensation scheme that uses a pulse width modulation (PWM) switched autotransformer. The proposed scheme aims to maintain the rated voltage at critical load terminals during voltage sag events. It consists of an IGBT switch and autotransformer connected in series with the load. During normal operation, the thyristors bypass the compensator and supply power directly to the load. During a sag, the IGBT is controlled by PWM pulses to inject the missing voltage and regulate the load voltage. Simulation results in MATLAB/Simulink show the performance of the three-phase compensator under different sag and swell conditions. The proposed approach has fewer switching devices and good compensating capability compared to other common compensators.
Boukhriss Compeng Italy 2022.pdf
This document describes using active disturbance rejection control (ADRC) for controlling a single-stage photovoltaic system connected to the electrical grid. It compares ADRC to the conventional perturb and observe (P&O) control method. ADRC combined with incremental conductance (ADRC-IC) is used for maximum power point tracking (MPPT) control. ADRC is also used to control the inverter to regulate the DC bus voltage and ensure unity power factor injection into the grid. The system aims to maximize power extraction from the PV array and regulate power injection into the grid with low harmonics.
Simulation of D-STATCOM to study Voltage Stability in Distribution system
This document presents a simulation study of a D-STATCOM (Distribution Static Compensator) to improve voltage stability in a distribution system. It first provides background on voltage dips and describes the structure of a STATCOM, which includes a voltage source inverter, transformer, and controller. The simulation model of the D-STATCOM and distribution network is developed using SimPowerSystems blocks. Simulation results show that without the D-STATCOM, voltage dips to 0.93 p.u. during a load change, but with the D-STATCOM the voltage is stabilized at 1.0 p.u., demonstrating its effectiveness in mitigating power quality issues like voltage instability.
L01_EEE_4243.pptx
1. The document provides an overview of a course on power system operation and control taught by Dr. Md. Sohel Rana at Rajshahi University of Engineering & Technology.
2. The course covers topics related to power generation operation and control including load frequency control, automatic generation control, and automatic voltage regulation.
3. Diagrams and mathematical models are presented for different components of power systems including generators, governors, turbines, loads, and control loops. Transfer functions are developed and simulations shown.
J41027175
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
Implementation for Controller to Unified Single Phase Power Flow Using Digita...
Presenting in his paper, Digital signal processor (DSP)-based implementation of a single phase unified power flow controller (UPFC). For shunt side and series side An efficient UPFC control algorithm is achieved. Discussing the laboratory experimental results using DC source are taken as an UPFC linked by two ll-bridge PWM voltage source converters.
Simulation of a 13-Level Inverter with Facts Capability for Distributed Energ...
This Paper Presents A whole New resonant twin active bridge(DAB) topology, that uses a tuned inductor-capacitor-inductor(LCL) network. As compared to ancient DAB topologies, the planned topologies significantly reduced the bridge current, lowering every physical phenomenon and alter losses and conjointly VA rating associated with the bridges. The performance of the DAB is investigated using a mathematical model at a lower place varied operational conditions. Experiment results of a model is reduced the outflow current of the circuit. are presented with discussion to demonstrate the improved performance of the LCL DAB topology. Result clearly that the planned DAB Topology provide higher efficiency over an oversized vary of every input voltage and as compared to ancient DAB topology
Ijmet 10 01_109
This paper presents modelling and control of maximum power point tracking (MPPT) for a three phase grid–tied photovoltaic (PV) system by using a non-linear controller namely double integrated sliding mode controller (DISMC) to enhance MPPT and to stabilize the output power of PV system. The non-linear I-V, P-V characteristics of PV systems depends upon irradiation and temperature; causes difficulty in tracking maximum power. The PV system consists of a PV panel, DC/DC boost converter and a MPPT controller to generate pulses which are fed to converter for tracking maximum power. In this paper, the performance of DISMC-MPPT shown to be effective when compared to other controllers like perturb & observe (P&O)-MPPT, adaptive P&O-MPPT, sliding mode controller (SMC)-MPPT and integral SMC (ISMC)-MPPT. The presented DISMC-MPPT method is robust, provides quicker and steady tracking maximum power with respect to the other discussed methods and also performs well during any change in weather conditions. To validate the effectiveness, the mathematical modelling of all the above mentioned non-linear controller MPPT methods and their simulations are carried on Matlab/SIMULINK
A random PWM control strategy for a three level inverter used in a grid conne...
A random PWM control strategy for a three level inverter used in a grid conne...International Journal of Power Electronics and Drive Systems
The work presented in this paper is devoted to the control of a photovoltaic system connected to grid by a three level diode clamed inverter. A control structure based on three parts: dc link voltage control, power injected control and current control is proposed. In this work, the random PWM strategy is used to generate control signals for the multilevel inverter used us an interface to connect photovoltaic generators to the grid. Numerical simulations are performed using MATLAB / Simulink software, the simulation results for the proposed system indicate the performances of the proposed control structure, minimization of harmonics by the random PWM strategy applied and injection to the grid more active power by the multilevel inverter structure.Modified Bidirectional Converter with Current Fed Inverter
A bidirectional dc-dc converter with multiple outputs are concatenated with a
high frequency current source parallel resonant push pull inverter is
presented in this paper. The two outputs are added together and it is taken as
the input source for the inverter. The current source parallel resonant push
pull inverter implemented here with high frequency applications like
induction heating, Fluorescent lighting, Digital signal processing sonar. This
paper proposes a simple photovoltaic power system consists of a
bidirectional converter and a current fed inverter for regulating the load
variations. Solar power is used as the input source for the system. Simulation
of the proposed system is carried out in PSIM software and experimentally
verified the results.
Transient Stability of Power System using Facts Device-UPFC
This paper is based on Occurrence of a fault in a power system causes transients. To stabilize the system, The Flexible Alternating Current Transmission (FACTS) devices such as UPFC are becoming important in suppressing power system oscillations and improving system damping. The UPFC is a solid-state device, which can be used to control the active and reactive power.. By using a UPFC the oscillation introduced by the faults, the rotor angle and speed deviations can be damped out quickly than a system without a UPFC. The effectiveness of UPFC in suppressing power system oscillation is investigated by analyzing their oscillation in rotor angle and change in speed occurred in the two machine system considered in this work. A proportional integral (PI) controller has been employed for the UPFC. It is also shown that a UPFC can control independently the real and reactive power flow in a transmission line. A MATLAB simulation has been carried out to demonstrate the performance of the UPFC in achieving transient stability of the two-machine five-bus system.
TRANSIENT ANGLE STABILITY
The ability of the power system to maintain synchronous operation when subjected to a severe transient disturbance
faults on transmission circuits, transformers, buses
loss of generation
loss of loads
Response involves large excursions of generator rotor angles: influenced by nonlinear power-angle relationship
Stability depends on both the initial operating state of the system and the severity of the disturbance
Post-disturbance steady-state operating conditions usually differ from pre-disturbance conditions
Study of the impact on the protection plan of a pv production integrated to t...
This document summarizes a study on the impact of integrating a 5 MW photovoltaic production system on the protection scheme of a medium voltage grid. Simulations were performed for different fault scenarios on the grid with and without the PV system. The results showed that the PV system integration can cause unjustified operation of protections and disconnect the PV system unnecessarily. This is due to the bidirectional power flow and dynamics introduced by distributed generation. The protection scheme may need adjustment according to the penetration level of distributed PV resources to coordinate properly.
Jg2516381645
This document discusses fault analysis and improving power quality using multilevel static synchronous compensators (STATCOMs). It proposes a method to detect faults in STATCOM modules, identify the faulty module, and reconfigure the STATCOM to continue operating with reduced performance until the faulty module can be replaced. The key advantages of this approach are that it requires no additional sensing, uses minimal additional hardware, is compatible with the modular design of cascaded converters, and does not significantly impact the STATCOM's dynamic performance or total harmonic distortion.
Jg2516381645
1) This document proposes a method for fault detection and isolation in multilevel static synchronous compensators (STATCOMs).
2) The method involves measuring the output DC link voltage of each phase and comparing it to expected voltages to detect faults. If a fault is detected, the faulty module is isolated.
3) The advantages of this approach are that it requires no additional sensing beyond normal control purposes, has minimal additional hardware needs, is compatible with modular STATCOM designs, and does not significantly impact STATCOM performance after a fault.
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International Journal of Engineering Research and Development
International Journal of Engineering Research and Development
How to conduct the lightning impulse withstand test on 550kv GIS?
How to conduct the lightning impulse withstand test on 550kv GIS?
Simulation of D-STATCOM to study Voltage Stability in Distribution system
Simulation of D-STATCOM to study Voltage Stability in Distribution system
Implementation for Controller to Unified Single Phase Power Flow Using Digita...
Implementation for Controller to Unified Single Phase Power Flow Using Digita...
Simulation of a 13-Level Inverter with Facts Capability for Distributed Energ...
Simulation of a 13-Level Inverter with Facts Capability for Distributed Energ...
A random PWM control strategy for a three level inverter used in a grid conne...
A random PWM control strategy for a three level inverter used in a grid conne...
Modified Bidirectional Converter with Current Fed Inverter
Modified Bidirectional Converter with Current Fed Inverter
Transient Stability of Power System using Facts Device-UPFC
Transient Stability of Power System using Facts Device-UPFC
Study of the impact on the protection plan of a pv production integrated to t...
Study of the impact on the protection plan of a pv production integrated to t...
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Electrical power engineering test (1)
- 1. Electrical power engineering test (1( Elect.Eng/ Mohamed Safwat
- 2. Q1) 1a-What are abbreviations referring to? 1- PMG 2- MCB 3- RTD 1-PMG: Permanent magnet generator Is a generator which the excitation is from permanent magnet not a coil. 2-MCB: Miniature Circuit Breaker is a circuit breaker is used instead of fuse because it can open the circuit when there is a huge current and return to close when the huge current’s disappears. 3-RTD: Resistance Temperature Detector In this sensor varies according to temperature
- 3. Q2)What are the differences between Demand factor and load factor? Demand factor : is a ratio less than one and it is variable with the total connected load D.F=(Maximum demand (/Total connected load Load factor : is a ratio less than one L.F = load (kw/hours( /maximum load (kw/hours(
- 4. Q3)what is meant by CT burden = 10 VA? This mean that the maximum load applied to the secondary of current transformer is equal 10 VA
- 5. Q4)What is the function of AVR? Automatic voltage regulation: Is used for making the voltage is nearly constant by controlling the field excitation of the generator
- 6. Q5)what are the advantages and disadvantages of speed control of 3 phase induction motor by varying frequency explain with drawing? Advantages: 1-Wide speed control range. 2-Smooth method 3-More senstive method Disadvantages: 1-High cost 2-High harmonic 3–It may go to saturation
- 7. Q6)what is the voltage level which is used in transformer short circuit test? In short circuit test we feed the high voltage side by low level voltage until we reach the rated current to calculate cupper losses and (R – X – Z)
- 8. Q7) how to control P , Q , V , F in power generator , explain? The active power (P) is related with the frequency (F) so if we control frequency by controlling speed by using speed governer so we can control both (F & P) . Also the reactive power (Q) is related with the current of excitation ( V) so if we control the voltage v by using AVR it controls (Q).
- 9. Q8)Draw the full wave and half wave circuit of 3 phase system used in ups? Full wave rectifier for 3 phase system
- 10. Full wave rectifier for 3 phase system
- 11. Q9)what are the contactor categories? The contactor has two main parts: Power contact : connected with the power of the system and motors. Control contact : connect with switch buttons & Timers contact to control the open / close of power contact
- 12. Q10) Draw the restricted earth fault protection circuit install on power transformer and identify its parameters and draw C/C curve of it? E/F protection
- 13. Q11)two pumps must work with them at the same time but if the first pump start the second pump must delayed for some time to start , with motor rated power = 90 KW and rated voltage = 380 V and rated power factor = 0.85 lag please draw the power and control circuit for it and determine all circuit components parameters that you use it