This document discusses how wide area monitoring systems (WAMS) can improve power system protection. WAMS consist of phasor measurement units and phasor data concentrators that provide time-synchronized measurements across a wide area. This allows monitoring of dynamic system states. The document outlines several ways WAMS can enhance protection schemes, including adaptive relay settings, improved backup protection supervision, intelligent underfrequency load shedding adapted to conditions, and adaptive out-of-step relaying to prevent system separation. The goals are to avoid inappropriate relay operations, manage wide area disturbances, and ensure an appropriate balance of security and dependability in protection schemes.
Phasor measurement unit and it's application pptKhurshid Parwez
The effective operation of power systems in the present and the future depends to a large extent on how well the emerging challenges are met today. Power systems continue to be stressed as they are operated in many instances at or near their full capacities. In order to keep power systems operating in secure and economic conditions, it is necessary to further improve power system protection and control system. Phasor measurement unit (PMUs), introduced into power system as a useful tool for monitoring the performance of power system, has been proved its value in the extensive applications of electric power system. In response, a research program that is specifically aimed at using PMU to improve the power system protection and control. To ensure that the proposed research program is responsive to particular industry needs in this area, and participants of the workshop identified two major research areas in which technological and institutional solutions are needed: 1) PMU implementation, 2) PMU applications. It’s recommends research, design, and development (RD&D) projects in this report. The objective of these projects is to improve the reliability of local and wide transmission grid by enabling and enhancing the system protection and control schemes by using PMU measurement data, reduce the economic burden of utilizes to implement PMUs.
Phasor measurement unit and it's application pptKhurshid Parwez
The effective operation of power systems in the present and the future depends to a large extent on how well the emerging challenges are met today. Power systems continue to be stressed as they are operated in many instances at or near their full capacities. In order to keep power systems operating in secure and economic conditions, it is necessary to further improve power system protection and control system. Phasor measurement unit (PMUs), introduced into power system as a useful tool for monitoring the performance of power system, has been proved its value in the extensive applications of electric power system. In response, a research program that is specifically aimed at using PMU to improve the power system protection and control. To ensure that the proposed research program is responsive to particular industry needs in this area, and participants of the workshop identified two major research areas in which technological and institutional solutions are needed: 1) PMU implementation, 2) PMU applications. It’s recommends research, design, and development (RD&D) projects in this report. The objective of these projects is to improve the reliability of local and wide transmission grid by enabling and enhancing the system protection and control schemes by using PMU measurement data, reduce the economic burden of utilizes to implement PMUs.
Wide area monitoring systems (WAMS) are essentially based on the new data acquisition technology of phasor measurement and allow monitoring transmission system conditions over large areas in view of detecting and further counteracting grid instabilities.
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.
Smart Grid
Why do we need Smart Grid?
What is Smart Grid?
Smart Grid conceptual model
Wide Area Monitoring systems
What is WAMs
WAMS Architecture
Applications of Phasor Measurement Unit (PMU)
Concluding Remarks
As the world’s electricity systems face a number of challenges
such as
New dynamics of future demand and supply
Ageing infrastructure
Complex interconnected grids
Integration of large number of renewable generation sources
Need to lower carbon emissions
New type of loads such as Electric Vehicles
with the help of web based power quality monitoring system we can control and manage the data flow of electrical quantity and control the improve the quality of the power system in grid
The concept of FACTS (Flexible Alternating Current Transmission System) refers to a family of power electronics-based devices able to enhance AC system controllability and stability and to increase power transfer capability.
The phasor measurement unit (PMU) which is actually a key tool in providing situational awareness, operation and reliability of the power system network.
A Novel Back Up Wide Area Protection Technique for Power Transmission Grids U...Power System Operation
Current differential protection relays are widely applied
to the protection of electrical plant due to their simplicity,
sensitivity and stability for internal and external faults. The proposed
idea has the feature of unit protection relays to protect large
power transmission grids based on phasor measurement units. The
principle of the protection scheme depends on comparing positive
sequence voltage magnitudes at each bus during fault conditions
inside a system protection center to detect the nearest bus to
the fault. Then the absolute differences of positive sequence current
angles are compared for all lines connecting to this bus to
detect the faulted line. The new technique depends on synchronized
phasor measuring technology with high speed communication
system and time transfer GPS system. The simulation of the interconnecting
system is applied on 500 kV Egyptian network using
Matlab Simulink. The new technique can successfully distinguish
between internal and external faults for interconnected lines. The
new protection scheme works as unit protection system for long
transmission lines. The time of fault detection is estimated by 5
msec for all fault conditions and the relay is evaluated as a back
up relay based on the communication speed for data transferring.
Wide area monitoring systems (WAMS) are essentially based on the new data acquisition technology of phasor measurement and allow monitoring transmission system conditions over large areas in view of detecting and further counteracting grid instabilities.
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.
Smart Grid
Why do we need Smart Grid?
What is Smart Grid?
Smart Grid conceptual model
Wide Area Monitoring systems
What is WAMs
WAMS Architecture
Applications of Phasor Measurement Unit (PMU)
Concluding Remarks
As the world’s electricity systems face a number of challenges
such as
New dynamics of future demand and supply
Ageing infrastructure
Complex interconnected grids
Integration of large number of renewable generation sources
Need to lower carbon emissions
New type of loads such as Electric Vehicles
with the help of web based power quality monitoring system we can control and manage the data flow of electrical quantity and control the improve the quality of the power system in grid
The concept of FACTS (Flexible Alternating Current Transmission System) refers to a family of power electronics-based devices able to enhance AC system controllability and stability and to increase power transfer capability.
The phasor measurement unit (PMU) which is actually a key tool in providing situational awareness, operation and reliability of the power system network.
A Novel Back Up Wide Area Protection Technique for Power Transmission Grids U...Power System Operation
Current differential protection relays are widely applied
to the protection of electrical plant due to their simplicity,
sensitivity and stability for internal and external faults. The proposed
idea has the feature of unit protection relays to protect large
power transmission grids based on phasor measurement units. The
principle of the protection scheme depends on comparing positive
sequence voltage magnitudes at each bus during fault conditions
inside a system protection center to detect the nearest bus to
the fault. Then the absolute differences of positive sequence current
angles are compared for all lines connecting to this bus to
detect the faulted line. The new technique depends on synchronized
phasor measuring technology with high speed communication
system and time transfer GPS system. The simulation of the interconnecting
system is applied on 500 kV Egyptian network using
Matlab Simulink. The new technique can successfully distinguish
between internal and external faults for interconnected lines. The
new protection scheme works as unit protection system for long
transmission lines. The time of fault detection is estimated by 5
msec for all fault conditions and the relay is evaluated as a back
up relay based on the communication speed for data transferring.
Backpropagation Neural Network Modeling for Fault Location in Transmission Li...ijeei-iaes
In this topic research was provided about the backpropagation neural network to detect fault location in transmission line 150 kV between substation to substation. The distance relay is one of the good protective device and safety devices that often used on transmission line 150 kV. The disturbances in power system are used distance relay protection equipment in the transmission line. However, it needs more increasing large load and network systems are increasing complex. The protection system use the digital control, in order to avoid the error calculation of the distance relay impedance settings and spent time will be more efficient. Then backpropagation neural network is a computational model that uses the training process that can be used to solve the problem of work limitations of distance protection relays. The backpropagation neural network does not have limitations cause of the impedance range setting. If the output gives the wrong result, so the correct of the weights can be minimized and also the response of galat, the backpropagation neural network is expected to be closer to the correct value. In the end, backpropagation neural network modeling is expected to detect the fault location and identify operational output current circuit breaker was tripped it. The tests are performance with interconnected system 150 kV of Riau Region.
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Modelling and Implementation of Microprocessor Based Numerical Relay for Prot...Kashif Mehmood
This paper includes the design and implementation of Numerical Relay that can protect the equipment against over-voltage, over-current and under voltage. Although, every power system is subjected to faults and these faults can severe damage to the power system. Therefore, it is necessary
to observe and resolve in time to avoid a large damage such as blackouts. For this purpose, there
should be some sensing devices, which give signals to the circuit breakers for preventing of power
system damages. The multipurpose relays have much importance role in power system for sensing
and measuring the amplitude of faults. Numerical relay provides settings of over-current, overvoltage and under voltage values. Simulations have been carried out using Proteus software along
with tested on hardware with Arduino Uno Microcontroller that proves the working and operation of
numerical relay.
FUNDAMENTALS OF POWER SYSTEM PROTECTION
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A transient current based micro grid connected power system protection scheme...IJECEIAES
Micro-grids comprise Distributed Energy Resources (DER’s) with low voltage distribution networks having controllable loads those can operate with different voltage levels are connected to the micro-grid and operated in grid mode or islanding mode in a coordinated way of control. DER’s provides clear environment-economical benefits for society and consumer utilities. But their development poses great technical challenges mainly protection of main and micro grid. Protection scheme must have to respond to both the main grid and micro-grid faults. If the fault is occurs on main grid, the response must isolate the DER’s from the main grid rapidly to protect the system loads. If the fault ocuurs within the micro-grid, the protection scheme must coordinate and isolates the least priority possible part of the grid to eliminate the fault. In order to deal with the bidirectional energy flow due to large numbers of micro sources new protection schemes are required. The system is simulated using MATLAB Wavelet Tool box and Wavelet based Multi-resolution Analysis is considered. Wavelet based Multi-resolution Analysis is used for detection, discrimination and location of faults on transmission network. This paper is discussed a transient current based micro-grid connected power system protection scheme using Wavelet Approach described on wavelet detailed-coefficients of Mother Biorthogonal 1.5 wavelet. The proposed algorithm is tested in micro-grid connected power systems environment and proved for the detection, discrimination and location of faults which is almost independent of fault impedance, fault inception angle (FIA) and fault distance of feeder line.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
adversary training.
TECHNICAL TRAINING MANUAL GENERAL FAMILIARIZATION COURSEDuvanRamosGarzon1
AIRCRAFT GENERAL
The Single Aisle is the most advanced family aircraft in service today, with fly-by-wire flight controls.
The A318, A319, A320 and A321 are twin-engine subsonic medium range aircraft.
The family offers a choice of engines
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Industrial Training at Shahjalal Fertilizer Company Limited (SFCL)MdTanvirMahtab2
This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
1. IMPROVEMENT OF POWER SYSTEM
PROTECTION BY WIDE AREA
MONITORING NETWORK
Presented By UNDERTHE GUIDANCEOF
KOLLI MANOGNA G. UJWALA
2. INTRODUCTION TO POWER SYSTEMS
PROTECTIUON
Power system protection is defined as the
method of protecting the power systems from
the faults and clearing the abnormalities in
power systems to restore the operation.
This uses some special hardware which is used
for the both primary and backup protection
The main philosophy about protection is that no
protection of power system can prevent the flow
of fault current through the system, it only can
prevent the continuation of flowing of fault
current by quickly disconnect the short circuit
path from the system.
3. WIDE AREA MONITORING SYSTEMS
TheWide Area Monitoring System (WAMS) consists of geographically
dispersed Phasor Measurement Units (PMUs) delivering
Synchrophasors, i.e., time-tagged data samples of a power system’s
sinusoidal voltage or current using a standard time signal as the
reference, to Phasor Data Concentrators (PDCs).
These PDCs perform the desired signal handling and assembly of
synchronized Phasor measurements into snapshots.They may also
facilitate long term storage in high-resolution historical archives.The
data in each PMU are time Synchronized to Universal CoordinatedTime
(UTC), for example via Global -2- Positioning System (GPS) receivers
with an accuracy of one microsecond and stored in PDCs.The Phasors
measured simultaneously provide snapshots of the state of the
monitored nodes.
By comparing these snapshots, not only during steady state, also the
dynamic state of critical nodes in transmission, sub-transmission and
distribution networks can be observed.
4. Failures in power systems
CASCADE FAILURES
INAPPROPRIATE OPERATION OF RELAYS
HIDDEN FAILURES
5. NEED FOR WAMS IN BACKUP
PROTECTION
The need for wide area measurements as part of
primary protection is limited, as it protects a
specific element of the power system.
However, aspects of power system protection
that have lower requirements in terms of the
speed of response (e.g. backup protection) and
are less selective can be improved by using wide
area measurements to supervise their behavior.
These mal operations can be attributed to either
poor relay settings or hidden failures in the
protection system.
6. Novel system integrity protection schemes (SIPS)
that can deploy a wide range of far reaching actions
to prevent a cascading failure, adaptive system
protection (e.g. adaptive under frequency load
shedding), supervisory schemes that improve the
security of existing backup protection, and methods
that do not change the behavior of system
protection but do enhance our understanding of it
(e.g. alarming system operators to the risk of false
penetration of relay characteristics).
Recent work has begun to focus not only on
developing new concepts but also on the practical
realization of these.
7. OBJECTIVES OF WIDE AREA
PROTECTION SCHEMES
Avoiding inappropriate relay settings for the
prevailing system conditions.
Managing wide area disturbances.
Mitigating the impact of hidden failures.
Ensuring a suitable balance between the
security and dependability of protection.
8. WIDE AREA PROTECTION SCHEMES
(WAPS)
ENHANCING PROTECTIONWITHWIDEAREA
MONITORING
ALARMINGAGAINSTTHE RISK OF RELAY
CHARACTERISTIC PENETRATION
PREVENTING LOAD ENCROACHMENT
ADJUSTINGTHE BALANCE BETWEENTHE SECURITYAND
DEPENDABILITYOF PROTECTION
SUPERVISIONOF BACK-UP ZONES
INTELLIGENT UNDER FREQUENCY LOAD SHEDDING
ADAPTIVEOUT-OF-STEP RELAYING
SYSTEM INTEGRITY PROTECTION SCHEMES (SIPS)
MICROGRID PROTECTION
9. ENHANCING PROTECTION WITH WIDE
AREA MONITORING
The goal of protection is to protect individual elements of
the power system from damage and to protect the security
of the power system itself. In the case of primary
equipment protection there is very little role for the use of
wide area monitoring.This is because primary protection
must reliably deliver a very fast response for any fault on
the element that it protects.
However, the slower speed of response required for backup
protection and the fact that it protects a zone of the system
means that wide area monitoring can be a useful tool for
improving its performance.The most effective means for
ensuring that the system will survive extreme conditions
and wide area disturbances is a high degree of built in
redundancy and strength
10. Wide area measurements offer the potential to create supervisory
schemes for backup protection, more advanced forms of system
protection and entirely new protection concepts. Some of them are:
1. Adaptive relays that update their settings as the system state
changes.
2. Improved protection of multi terminal lines.
3. Adaptive end of line protection that monitors the remote
breaker, if it is open the under reaching Zone 1 is replaced with
an instantaneous characteristic.
4. Temporarily adapt relay settings to prevent mal operation
during cold load pickup.
5. Use the ability of digital relays to self-monitor to identify
hidden failures and use the hot swap functionality offered by
International Electro technical Commission to remove them.
6. Intelligent controlled islanding that preempts an uncontrolled
system separation by implementing an adaptive controlled
separation
11. ALARMING AGAINST THE RISK OF RELAY
CHARACTERISTIC PENETRATION
The objective of this application is to detect
when the impedance observed by a relay
approaches the relay characteristic under
non-faulty conditions.This information is
then used to alarm protection engineers to a
relay setting that is potentially unsuitable.
12. PREVENTING LOAD ENCROACHMENT
Heavily loaded lines may encroach on the
settings of relays and cause an incorrect and
inappropriate tripping operation during
stressed conditions and power swings.
With the computational power of digital
relays this can be overcome by using real
time measurements of the load to prevent
load encroachment by compensating the
relay input of load current.
13. ADJUSTING THE BALANCE BETWEEN THE
SECURITY AND DEPENDABILITY OF PROTECTION
Balancing the demands of dependability and security is one
of the greatest challenges during the design of protection.
During a wide area disturbance, this preference for
dependability can result in incorrect and inappropriate
tripping operations.
It would attractive to shift the balance of this compromise
toward security during stressed conditions, i.e. when the
conditions encountered (e.g. power swings) can increase
the likelihood of mal operations and reveal hidden failures.
Wide area measurements could be used to detect that the
system has entered a stressed condition and then adjust
the protection philosophy to shift the balance away from
dependability and toward security.
14. USE OF WAM TO VARY THE BALANCEBETWEEN
DEPANDABILITY AND SECURITY
16. SUPERVISION OF BACK-UP ZONES
The mal operation of zone 3 relays was identified as a significant
contributing factor to recent blackouts.The unusual load currents and
power swings observed during wide area disturbances can cause these
relays to operate undesirably. Examples of the system behavior that can
cause mal operation of a relay are shown in Fig. 3.
The remote PMUs are installed within the protection zone of the backup
relay and monitor the current at these remote locations.
These devices implement a simple pickup characteristic and
communicate a binary pick up signal to the backup relay.
If the backup relay characteristic is violated but none of the remote
devices have picked up, then it can be concluded that no fault has
occurred and the backup relay operation can be blocked.
This prevents load swings during extreme conditions from being
misinterpreted as faults and helps prevent the mal operation of backup
relays from allowing a wide area disturbance to spread through the
system.
17.
18. INTELLIGENT UNDER FREQUENCY LOAD
SHEDDING
Load shedding is the traditional last line of defense
against extreme under frequency conditions.
Current practice is mostly for this shedding to be
delivered using a sequence of stages of shedding
that are triggered when a certain frequency
threshold is violated.
Shedding load more quickly after a loss of in feed is
recognized as an effective means for limiting the
frequency deviation with a reduced amount of load
shedding.
However, balancing the benefits of an increased
speed of response against the risk of unnecessary
shedding is a challenge.
19. Extensive research has been undertaken to create more advanced load
shedding schemes that use wide area measurements to reduce the
amount of load shed by:
1. Adapting the amount of load shed to the prevailing system conditions,
e.g. inertia.
2. Initiating the load shedding more quickly.
Initiating the load shedding more quickly can be achieved by using
event based signals (e.g. the loss of a major interconnector or
generator) or by using more complex triggering signals (e.g. triggering
based on rate of change of frequency).
Furthermore, the amount of load shed can be adapted to the size of
the disturbance and system inertia using wide area measurements.
Examples of this work include the adaption of shedding based on
measurements of rate of change of frequency (RoCoF) immediately
after the disturbance.
Quick measuring of RoCoF is very challenging. But it is easily
measured by PMUs which are adopted inWAPS.
20. ADAPTIVE OUT-OF-STEP RELAYING
Out of step conditions and system separation
are key precursors to system collapse and
blackouts. As the formation of an electrical
center approaches the system will experience
extreme power swings that will further
exacerbate stressed conditions and drive the
system closer to collapse.Therefore, it is
imperative that any potential out of step
condition is quickly recognized and
prevented; this is the role of out of step relays
21. A wide area protection scheme could be developed that
monitors the positive sequence voltages across the system.
These synchronized real time measurements can be used to
predict if regions of the system are approaching an out of
step condition.
This prediction could be used to initiate a controlled
separation of the areas that are losing synchronism or, if
the prediction is available sufficiently in advance, actions
could be taken to prevent the out of step condition from
occurring and avoid system separation entirely.
The challenge faced when developing such a scheme would
be selecting the measurement locations and developing
the algorithms for achieving robust real time coherency
determination when the coherent generator groups are
variable.
22. SYSTEM INTEGRITY PROTECTION
SCHEMES (SIPS)
SIPS protect power system security from extreme contingencies or wide
area disturbances that are beyond the scope of traditional protection.
The stages involved in the execution of a SIPS are:
1. Identification and prediction of stressed conditions,`
2. Classification of the threat to system security, ́
3. Decisions and actions,
4. Coordination, and
5. Correction.
Examples of SIPS include: generator rejection, load rejection, under
frequency and voltage load shedding , system separation, dynamic
braking, and turbine valve control.
SIPS is used of their ability, such as availability of real time wide area
measurements, to identify complex emerging threats to the power
system and respond to them quickly .
23. MICRO GRID PROTECTION
The changes faced by distribution networks include the
connection of energy storage, electric vehicles, smart meters,
demand side participation and the connection of distributed
generation (DG).
The protection schemes of DG is very similar to the infrastructure
of the transmission lines.
However, the smaller angular separation across a distribution
network means that measurement of angles on the distribution
network is more demanding than it is at the transmission level.
A particularly important enabler for these new protection
principles are microprocessor relays that can vary their settings
easily.
WAP delivers the protection needs of future distribution systems.
24.
25.
26. CONCLUSION
WAM offers a wide variety of opportunities for enhancing
the backup protection and system protection of modern
power systems.These enhancements can contribute to
reducing the likelihood of the mal operation of backup
relays, limiting the impact of hidden failures and creating
new tools for managing wide area disturbances.These
benefits indicate that the main role of wide area monitoring
as part of protection is improving the resilience of power
systems against stressed conditions and wide area
disturbances, not the isolation of individual faults.The well-
considered deployment of these new concepts should
reduce the frequency and intensity of blackouts and enable
more rapid service restoration
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