This document summarizes a project on automatic load frequency control and automatic load dispatch presented by four students at Madan Mohan Malaviya University of Technology, Gorakhpur. It introduces load frequency control and discusses its objectives to maintain uniform frequency and control tie-line power interchange. It then analyzes the response of load frequency control for an isolated single area power system and a two area interconnected power system, both with and without control. The conclusion states that controllers keep generators operating near a normal state with minimal deviations, and simulation results show the proposed approach ensures viable system evolution despite load and failure changes.
Load Frequency Control of Two Area SystemManash Deka
This is a synopsis presentation on a project of designing and analyzing Load Frequency Control (LFC) of a two area system. This is useful for students, basically of Electrical Engineering branch. This project will be simulated in simulink of MATLAB.
Load Frequency Control of Two Area SystemManash Deka
This is a synopsis presentation on a project of designing and analyzing Load Frequency Control (LFC) of a two area system. This is useful for students, basically of Electrical Engineering branch. This project will be simulated in simulink of MATLAB.
As the fifth in a series of tutorials on the power system, Leonardo ENERGY introduces its minute lecture on voltage and frequency control, using the analogy of a metal/rubber plate to demonstrate the centralised nature of frequency control, whereas voltage control is more a local matter.
These slides explain about MPPT control and different approaches for wind generation system. Later I will show the comparative results with MATLAB simulation.
Automatic generation control (AGC) is a system for adjusting the power output of multiple generators at different power plants, in response to changes in the load. Since a power grid requires that generation and load closely balance moment by moment, frequent adjustments to the output of generators are necessary. The balance can be judged by measuring the system frequency; if it is increasing, more power is being generated than used, which causes all the machines in the system to accelerate. If the system frequency is decreasing, more load is on the system than the instantaneous generation can provide, which causes all generators to slow down.
Classification Of Power System StabilityAravind Shaji
The Slide Deals With Power System Stability. Contents Include
Power System Stability Overview
Power System Stability: A Proposed Definition
Need of Stability Classification
Classification of stability
Power System Stability Classification
Rotor Angle Stability
Voltage Stability
Frequency Stability
Rotor Angle Stability vs. Voltage Stability
References
As the fifth in a series of tutorials on the power system, Leonardo ENERGY introduces its minute lecture on voltage and frequency control, using the analogy of a metal/rubber plate to demonstrate the centralised nature of frequency control, whereas voltage control is more a local matter.
These slides explain about MPPT control and different approaches for wind generation system. Later I will show the comparative results with MATLAB simulation.
Automatic generation control (AGC) is a system for adjusting the power output of multiple generators at different power plants, in response to changes in the load. Since a power grid requires that generation and load closely balance moment by moment, frequent adjustments to the output of generators are necessary. The balance can be judged by measuring the system frequency; if it is increasing, more power is being generated than used, which causes all the machines in the system to accelerate. If the system frequency is decreasing, more load is on the system than the instantaneous generation can provide, which causes all generators to slow down.
Classification Of Power System StabilityAravind Shaji
The Slide Deals With Power System Stability. Contents Include
Power System Stability Overview
Power System Stability: A Proposed Definition
Need of Stability Classification
Classification of stability
Power System Stability Classification
Rotor Angle Stability
Voltage Stability
Frequency Stability
Rotor Angle Stability vs. Voltage Stability
References
We have seen in the last set of notes (on stability) that synchronous generators respond to load-generation imbalances by accelerating or decelerating (changing speeds). For example, when load increases, generation slows down, effectively releasing some of its inertial energy to compensate for the load increase. Likewise, when load decreases, generation speeds up, effectively absorbing the oversupply as increased inertial energy.
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In an interconnected, essentially meshed network, the distribution of energy
flows mainly depends on:
- the location of loads,
- the location of generation sets in operation,
- the cross-border exchanges,
- the location of means of reactive energy compensation,
- the impedances of transmission facilities.
These energy transits constitute a flow going from the substations where the
power plants are connected to the substations where customers are connected;
it is conveyed through the transmission lines and cables and divided up
proportionally to the admittance, i.e. the impedance reciprocal (which is in
some way a marked preference for the "shortest route"). This energy flow is
materialised by the current conveyed through the facilities. The higher the
energy flow is, the greater the current intensities will be. These intensities may
increase, in particular when a facility has tripped following a fault occurrence.
The flow initially borne by this facility will be transferred to the neighbouring
facilities: this is the load transfer phenomenon.
These energy transits constitute a flow going from the substations where the
power plants are connected to the substations where customers are connected;
it is conveyed through the transmission lines and cables and divided up
proportionally to the admittance, i.e. the impedance reciprocal (which is in
some way a marked preference for the "shortest route"). This energy flow is
materialised by the current conveyed through the facilities. The higher the
energy flow is, the greater the current intensities will be. These intensities may
increase, in particular when a facility has tripped following a fault occurrence.
The flow initially borne by this facility will be transferred to the neighbouring
facilities: this is the load transfer phenomenon.
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.
Control Schemes for Distribution Grids with Mass Distributed GenerationUmair Shahzad
This paper discusses the control schemes for distribution grids with a large amount of wind penetration. Microgrids are constantly gaining popularity, especially in the countries, where there is energy crisis. They are an effective way for providing power to local loads. In case of main grid failure, they ensure smooth and seamless power transfer. Various electrical systems, including synchronous generators, grid and loads, have been investigated in this paper. All simulation work is carried out using SimPower Systems. Major focus is placed on active and reactive power sharing. Load transients have also been modelled. Moreover, power sharing under variable wind has also been simulated and analysed.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
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Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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1. AUTOMATIC LOAD FREQUENCY CONTROL
AND AUTOMATIC LOAD DISPATCH
B.TECH ELECTRICAL ENGINEERING
MADAN MOHAN MALAVIYA UNIVERSITY OF TECHNOLOGY,
GORAKHPUR
Project Mentor
Professor S.K Srivastava
Electrical Engineering Department
Presented By
Utkarsh tiwari : 2019031150
Abhishek Kumar : 2019031005
Anubhav Soni : 2019031034
Shubham Pal : 2019031131
3. INTRODUCTION
➢ Changes in real power affect mainly the system frequency,
while reactive power is less sensitive to changes in frequency
and is mainly dependent on changes in voltage magnitude.
➢ Thus, real and reactive powers are controlled separately.
The load frequency control (LFC) loop controls the real power
and frequency.
➢ Whenever there is increase in the load, the Frequency decrease
and increases when the load is decreased.
➢ The frequency normally vary by about 5% between light load
and full load condition.
4. Load Frequency Control
➢ The operation objectives of the LFC are to
maintain reasonably uniform frequency to
divide the load between generators, and to
control the tie-line interchange schedules.
➢ The change in frequency and tie-line real
power are sensed, which is a measure of
the change in rotor angle δ, i.e., the error
Δδ to be corrected.
➢ The error signal, i.e., Δf and ΔPtie, are
amplified, mixed, and transformed into a
real power command signal ΔPv, which is
sent to the prime mover to call for an
increment in the torque
5. Response of Load Frequency Control of an Isolated
Single area Power System
➢ The load frequency control of power system with and without
controller should be analysed for its steady state and dynamic
response behaviour.
➢ Uncontrolled: without Controller
Data used are as follows:- Δ𝑃𝐷 = 0.01 𝑇 = 20 sec 𝐾p = 100 (Generator Gain)
𝐾𝑔 ∗ 𝐾𝑡 = 1 𝑇p = 20 sec. 𝑅 = 1/2
7. Controlled Case of Single Area
➢ Before analyzing the controlled case of a single area power system, we
shall define "Control Area".
Control Area: The power pools in which all the generators are assumed to be
tightly coupled, i.e. they swing in "unison" with change in load or due to speed
changer settings. Such an area, where all the generators are running coherently,
is termed as "control area".
Integral Control: By using the control strategy shown in fig. [1.4], we can
control the intolerable dynamic frequency changes with changes in load and
also the synchronous clocks but not without error during transient period.
Fig: 1.4 Block diagram representation of single area Power System (controlled)
Data used are as follows:-
Δ𝑃𝐷 = 0.01 𝐾𝑖 = 0.312
𝑇 = .08 sec 𝑇𝑖 = 0.3sec.
𝐾𝑔 ∗ 𝐾𝑡 = 1
𝑇p=20sec. 𝑅 = 1/2
𝐾p = 100 (Generator
Gain)
9. Response of Load Frequency Control of
Two area interconnected Power System
➢ An extended power system can be divided into a number of
load frequency control areas inter connected by means of
tie lines. Consider a two area case connected by a single tie
line as illustrated as below :
➢ Power transmitted from the area 1
is given by:
10. ➢ Change in angle can be expressed as the integral of change
in frequency:
➢ In general load model ,the incremental power
balance equation of area1 can be written as:
11. Fig 1.6 : Block diagram model of a two area interconnected system(Uncontrolled)
Data used are as follows:-
Δ𝑃d=0.01 Tt=0.3s 𝑇g=0.08 sec 𝐾p=100 (Generator Gain)
𝐾𝑔∗𝐾𝑡=1 𝑇p=20 sec. 𝑅1=-0.5
R2= -0.25
12. Uncontrolled Case of Two Area Interconnected system
Steady State Response
➢We consider first the uncontrolled case with ΔPC1 = ΔPCE = 0.
Suppose that the load in each area is suddenly increased by
incremental steps △ 𝑃01&Δ𝑃𝑂2∗ Due to the incremental loads,
we shall have frequency drops in the steady state and these
drops will be equal to:
Δ𝑓1stat = Δ𝑓𝑍stat = Δ𝑓stat
➢ Suppose a step load change occurs in area 1 only, then we get
13. Dynamic Response of Uncontrolled Case:-
➢The dynamic response of the two area, system is based on the
following assumptions.
➢Consider the case of two equal areas.
➢ Consider the turbine controller fast relative to the inertia part of
the system. GH = GT = 1.
➢Neglect the system damping i.e. Assume the load not to vary
with frequency D1 = D2 = 0.
➢Derive the following expression for the tie-line from the block
diagram:-
14. .
Fig 1.7: Load Frequency Response of Two Area interconnected system
(uncontrolled)
For area1 the frequency response f1 will be:-
15. Controlled case in Two Area interconnected System
➢ If frequency of two areas is to be controlled, the static
frequency drop is just one half of that of the isolated
operation of two systems If there is change in load in any
area, half of it will be shared by the other area.
➢ It is found that if a load changes in an area, the frequency
and interchange errors in that area have the same sign while
these opposite signs for the other area. Thus the relative
signs of the frequency and interchange deviations help to
identify the area where the load has changed.
16. Fig. 1.8: Load Frequency Response of Two Area Interconnected system (Controlled)
Data used are as follows:-
Δ𝑃d= 0.01 𝐾𝑖 = 0.312 𝑇g = .08 sec 𝑇𝑖 = 0.3sec. 𝐾𝑔 ∗ 𝐾𝑡 = 1 𝑇p=20sec.
𝑅1 = -1/2 𝐾p = 100 (Generator Gain)
R2= -0.025
17. Fig. 1.8: Load Frequency response of Two Area interconnected system System
(Controlled)
18. Conclusion
➢ Under normal operation the controllers keep the generator
operating around a pre-selected "normal" state with minimal
excursions.
➢ The dynamic models of all controllers that have been
discussed have therefore been linear.
➢ Simulation results have shown that the proposed approach
ensures viable evolutions to the overall power system with
respect to the prescribed operative constraints despite changes
in the loads and failure events.
19. References
➢ Research Paper on Load Frequency Control in Power System by
Md. AlAmin Sarker and A K M Kamrul Hasan - SEU Journal of
Science and
Engineering, Vol. 10, No. 2, 2016
➢ Power system Analysis by Hadi Saadat -The McGraw-Hill and
Schaum`s Elecctronic Tutors
➢ Research paper on Automatic Load Frequency Control by Shallu
Sharma and Jitendra Bhadoriya -International journal of
innovative
research in electrical, electronics, instrumentation and control
Engineering
➢ Research paper on Automatic Load Frequency Control of a Multi-
Area
Dynamic Interconnected Power System by Veerapandiyan
Veerasamy, Noor Izzri Abdul Wahab, Rajeswari Ramachandran
,Mohammad Lutfi Othman and Jeevitha Satheesh Kumar