This document presents an overview of reactive power compensation. It defines reactive power compensation as managing reactive power to improve AC system performance. There are two main aspects: load compensation to increase power factor and voltage regulation, and voltage support to decrease voltage fluctuations. Several methods of reactive power compensation are discussed, including shunt compensation using capacitors and reactors, series compensation, static VAR compensators (SVCs), static compensators (STATCOMs), and synchronous condensers. SVC and STATCOM technologies are compared, with STATCOMs having advantages of smaller components, better control, and transient response.
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.
Introduction to reactive power control in electrical powerDr.Raja R
Introduction to reactive power control in electrical power
Reactive power in transmission line :
Reactive power control
Reactive power and its importance
Apparent Power
Reactive Power
Apparent Power
Reactive Power Formula
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.
Introduction to reactive power control in electrical powerDr.Raja R
Introduction to reactive power control in electrical power
Reactive power in transmission line :
Reactive power control
Reactive power and its importance
Apparent Power
Reactive Power
Apparent Power
Reactive Power Formula
Nowadays, it is very important to maintain voltage level. Controlling of that voltage is also important. This Presentation contains methods of voltage control.
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.
Generation of High D.C. Voltage (HVDC generation)RP6997
Generation of high dc voltage using different methods like half wave and full wave rectifier, voltage doubler circuits, voltage multiplier circuits, cockcroft-walton circuits and van de graaff generators.
Functions and Performance Requirements
Elements of an Excitation System
Types of Excitation Systems
Control and Protection Functions
Modeling of Excitation Systems
The functions of an excitation system are
to provide direct current to the synchronous generator field winding, and
to perform control and protective functions essential to the satisfactory operation of the power system
The performance requirements of the excitation system are determined by
Generator considerations:
supply and adjust field current as the generator output varies within its continuous capability
respond to transient disturbances with field forcing consistent with the generator short term capabilities:
rotor insulation failure due to high field voltage
rotor heating due to high field current
stator heating due to high VAR loading
heating due to excess flux (volts/Hz)
Power system considerations:
contribute to effective control of system voltage and improvement of system stability
Automatic voltaer regulator and it's modellingrajani51
in power supply system we have to keep the voltage constant.but when load is connected to the generator voltage difference will occur. to tackle this closed loop control of generator voltage is required. this can be achieved by AUTOMATIC VOLTAGE REGULATOR
Unit I: Introduction to Protection System:
Introduction to protection system and its elements, functions of protective relaying, protective zones, primary and backup protection, desirable qualities of protective relaying, basic terminology.
Relays:
Electromagnetic, attracted and induction type relays, thermal relay, gas actuated relay, design considerations of electromagnetic relay.
Unit-II: Relay Application and Characteristics:
Amplitude and phase comparators, over current relays, directional relays, distance relays, differential relay.
Static Relays: Comparison with electromagnetic relay, classification and their description, over current relays, directional relay, distance relays, differential relay.
Unit-III Protection of Transmission Line:
Over current protection, distance protection, pilot wire protection, carrier current protection, protection of bus, auto re-closing,
Unit-IV: Circuit Breaking:
Properties of arc, arc extinction theories, re-striking voltage transient, current chopping, resistance switching, capacitive current interruption, short line interruption, circuit breaker ratings.
Testing Of Circuit Breaker: Classification, testing station and equipments, testing procedure, direct and indirect testing.
Unit-V Apparatus Protection:
Protection of Transformer, generator and motor.
Circuit Breaker: Operating modes, selection of circuit breakers, constructional features and operation of Bulk Oil, Minimum Oil, Air Blast, SF6, Vacuum and d. c. circuit breakers.
Introduction
Definition of FACTS system
Necessity of facts devices
Shunt connected controllers
Types of facts controllers
Shunt connected controllers
Benefits of FACTS
The concept of FACTS (Flexible AC 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 design of the different schemes and configurations of FACTS devices is based on the combination of traditional power system components (such as transformers, reactors, switches, and capacitors) with power electronics elements (such as various types of transistors and thyristors).
its a presentation describing all the major features and aspects of microgrids and their contribution in solving grotesque power crises situations.
hope one would find it helpful.
email your feedback at sumitraturi001@gmail.com.
Nowadays, it is very important to maintain voltage level. Controlling of that voltage is also important. This Presentation contains methods of voltage control.
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.
Generation of High D.C. Voltage (HVDC generation)RP6997
Generation of high dc voltage using different methods like half wave and full wave rectifier, voltage doubler circuits, voltage multiplier circuits, cockcroft-walton circuits and van de graaff generators.
Functions and Performance Requirements
Elements of an Excitation System
Types of Excitation Systems
Control and Protection Functions
Modeling of Excitation Systems
The functions of an excitation system are
to provide direct current to the synchronous generator field winding, and
to perform control and protective functions essential to the satisfactory operation of the power system
The performance requirements of the excitation system are determined by
Generator considerations:
supply and adjust field current as the generator output varies within its continuous capability
respond to transient disturbances with field forcing consistent with the generator short term capabilities:
rotor insulation failure due to high field voltage
rotor heating due to high field current
stator heating due to high VAR loading
heating due to excess flux (volts/Hz)
Power system considerations:
contribute to effective control of system voltage and improvement of system stability
Automatic voltaer regulator and it's modellingrajani51
in power supply system we have to keep the voltage constant.but when load is connected to the generator voltage difference will occur. to tackle this closed loop control of generator voltage is required. this can be achieved by AUTOMATIC VOLTAGE REGULATOR
Unit I: Introduction to Protection System:
Introduction to protection system and its elements, functions of protective relaying, protective zones, primary and backup protection, desirable qualities of protective relaying, basic terminology.
Relays:
Electromagnetic, attracted and induction type relays, thermal relay, gas actuated relay, design considerations of electromagnetic relay.
Unit-II: Relay Application and Characteristics:
Amplitude and phase comparators, over current relays, directional relays, distance relays, differential relay.
Static Relays: Comparison with electromagnetic relay, classification and their description, over current relays, directional relay, distance relays, differential relay.
Unit-III Protection of Transmission Line:
Over current protection, distance protection, pilot wire protection, carrier current protection, protection of bus, auto re-closing,
Unit-IV: Circuit Breaking:
Properties of arc, arc extinction theories, re-striking voltage transient, current chopping, resistance switching, capacitive current interruption, short line interruption, circuit breaker ratings.
Testing Of Circuit Breaker: Classification, testing station and equipments, testing procedure, direct and indirect testing.
Unit-V Apparatus Protection:
Protection of Transformer, generator and motor.
Circuit Breaker: Operating modes, selection of circuit breakers, constructional features and operation of Bulk Oil, Minimum Oil, Air Blast, SF6, Vacuum and d. c. circuit breakers.
Introduction
Definition of FACTS system
Necessity of facts devices
Shunt connected controllers
Types of facts controllers
Shunt connected controllers
Benefits of FACTS
The concept of FACTS (Flexible AC 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 design of the different schemes and configurations of FACTS devices is based on the combination of traditional power system components (such as transformers, reactors, switches, and capacitors) with power electronics elements (such as various types of transistors and thyristors).
its a presentation describing all the major features and aspects of microgrids and their contribution in solving grotesque power crises situations.
hope one would find it helpful.
email your feedback at sumitraturi001@gmail.com.
In electrical engineering, a synchronous condenser (sometimes synchronous capacitor or synchronous compensator) is a device identical to a synchronous motor, whose shaft is not connected to anything but spins freely.
Recent simulation for Reactive power compensation using STATCOM that is Static Syncronous compensator on MATLAB software. It having lots of advantages over other conventional methods.
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A microgrid is a localized grouping of electricity generation, energy storage, and loads that normally operates connected to a traditional centralized grid (macrogrid). This single point of common coupling with the macrogrid can be disconnected. The microgrid can then function autonomously. Generation and loads in a microgrid are usually interconnected at low voltage. From the point of view of the grid operator, a connected microgrid can be controlled as if it were one entity.
Microgrid generation resources can include fuel cells, wind, solar, or other energy sources. The multiple dispersed generation sources and ability to isolate the microgrid from a larger network would provide highly reliable electric power. Produced heat from generation sources such as micro turbines could be used for local process heating or space heating, allowing flexible trade off between the needs for heat and electric power.
A High Performance PWM Voltage Source Inverter Used for VAR Compensation and ...IJMER
International Journal of Modern Engineering Research (IJMER) is Peer reviewed, online Journal. It serves as an international archival forum of scholarly research related to engineering and science education.
the ratio of the actual electrical power dissipated by an AC circuit to the product of the r.m.s. values of current and voltage. The difference between the two is caused by reactance in the circuit and represents power that does no useful work.
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1. A PRESENTATION ON REACTIVE
POWER COMPENSATION
BY
K.S.S VENKATA SATYA NAVEEN
S.MANOJ KUMAR
2. CONTENTS
Introduction
Reactive power
Need for reactive power
Need for reactive power compensation
Shunt compensation
Series compensation
Static VAR compensators (SVC)
Static compensators (STATCOM)
Synchronous Condensor
Conclusion
References
3. INTRODUCTION
Reactive power (VAR) compensation is defined as the
management of reactive power to improve the performance
of ac systems. There are two aspects:-
a) Load Compensation – The main objectives are to :-
i) increase the power factor of the system
ii) to balance the real power drawn from the system
iii) compensate voltage regulation
iv) to eliminate current harmonics.
b) Voltage Support – The main purpose is to decrease the
voltage fluctuation at a given terminal of transmission line.
Therefore the VAR compensation improves the stability of ac
system by increasing the maximum active power that can be
transmitted.
4. WHAT IS REACTIVE POWER ?
Power is referred as the product of voltage and
current
i.e. power = V x I
The portion of electricity that establishes and sustains
the electric and magnetic fields of alternating-current
equipment. Reactive power must be supplied to most
types of magnetic equipment, such as motors and
transformers.
In an ac transmission, when the voltage and
current go up and down at the same time, only real
power is transmitted and when there is a time shift
between voltage and current both active and reactive
power are transmitted.
5. ANALOGY OF REACTIVE POWER
Why an analogy? Reactive Power is an essential aspect of
the electricity system, but one that is difficult to comprehend
by a lay man. The horse and the boat analogy best describe
the Reactive Power aspect. Visualize a boat on a canal, pulled
by a horse on the bank of the canal.
6. In the horse and boat analogy, the horse’s objective (real power)
is to move the boat straightly.
The fact that the rope is being pulled from the flank of the
horse and not straight behind it, limits the horse’s capacity to
deliver real work of moving straightly.
Therefore, the power required to keep the boat steady in
navigating straightly is delivered by the rudder movement
(reactive power).
Without reactive power there can be no transfer of real power,
likewise without the support of rudder, the boat cannot move in a
straight line.
7. POWER TRIANGLE
Power factor = cosø
= real power / apparent power
= kW/ kVA
Whenever there is a phase shift
between V and I we have:-
a) real power (kW)
b) reactive (imaginary ) power (kVAR)
c) The combination is a complex or
apparent power (kVA)=√(kW)² + (kVAR)²
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8. WHY DO WE NEED REACTIVE
POWER?
In resistive loads the current produces the heat energy
which produces the desired output but incase of
inductive loads the current creates the magnetic field
which further produces the desired work. Therefore
reactive power is the non working power caused by the
magnetic current to operate and sustain magnetism in
the device .
Reactive power (vars) is required to maintain the voltage
to deliver active power (watts)through transmission
lines. When there is not enough reactive power the
voltage sags down and it is not possible to deliver the
required power to load through the lines.
9. Need for Reactive Power
Compensation
Reactive power generated by the ac power source is
stored in a capacitor or a reactor during a quarter of a
cycle and in the next quarter of the cycle it is sent back
to the power source. Therefore the reactive power
oscillates between the ac source and the capacitor or
reactor at a frequency equals to two times the rated
value (50 or 60 Hz). So to avoid the circulation between
the load and source it needs to be compensated .
Also to regulate the power factor of the system and
maintain the voltage stability we need to compensate
reactive power .
10. Methods of Reactive Power
Compensation
Shunt compensation
Series compensation
Synchronous condensers
Static VAR compensators
Static compensators
11. Shunt compensation
The device that is connected in parallel with the
transmission line is called the shunt compensator. A
shunt compensator is always connected in the middle of
the transmission line. It can be provided by either a
current source, voltage source or a capacitor.
An ideal shunt compensator provides the reactive power
to the system.
Shunt-connected reactors are used to reduce the line
over-voltages by consuming the reactive power, while
shunt-connected capacitors are used to maintain the
voltage levels by compensating the reactive power to
transmission line.
13. Series compensation
When a device is connected in series with the
transmission line it is called a series compensator. A
series compensator can be connected anywhere in the
line.
There are two modes of operation – capacitive mode of
operation and inductive mode of operation.
A simplified model of a transmission system with series
compensation is shown in Figure .The voltage
magnitudes of the two buses are assumed equal as V,
and the phase angle between them is δ.
15. Static VAR compensators
A static VAR compensator (or SVC) is an electrical device for
providing reactive power on transmission networks. The term
"static" refers to the fact that the SVC has no moving parts (other
than circuit breakers and disconnects, which do not move under
normal SVC operation).
The SVC is an automated impedance matching device, designed to
bring the system closer to unity power factor. If the power system's
reactive load is capacitive(leading), the SVC will use reactors
(usually in the form of thyristor-Controlled Reactors) to
consume vars from the system, lowering the system voltage.
Under inductive (lagging) conditions, the capacitor banks are
automatically switched in, thus providing a higher system voltage.
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16.
17. ADVANTAGES
a) Static VAR compensation is not done at line voltage; a
bank of transformers steps the transmission voltage
(for example, 230 kV) down to a much lower level (for
example, 9.5 kV).This reduces the size and number of
components.
b) They are more reliable .
c) Faster in operation .
d) Smoother control and more flexibility can be provided
with the help of thyristors.
18. Static Compensator
The devices use synchronous voltage sources for
generating or absorbing reactive power. A
synchronous voltage source (SVS) is constructed
using a voltage source converter (VSC). Such a
shunt compensating device is called static
compensator or STATCOM .
A STATCOM usually contains an SVS that is driven
from a dc storage capacitor and the SVS is
connected to the ac system bus through an
interface transformer. The transformer steps the ac
system voltage down such that the voltage rating of
the SVS switches are within specified limit.
19. Structure of STATCOM
Basically, the
STATCOM system
is comprised of
Power converters,
Set of coupling
reactors or a step-
up transformer,
Controller
21. Advantages of STATCOM
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The reactive components used in the STATCOM are
much smaller than those in the SVC.
The characteristics of STATCOM are superior.
The output current of STATCOM can be controlled up to
the rated maximum capacitive or inductive range.
Reduction of the capacity of semiconductor power
converter and capacitor bank to one half of those for the
conventional SVC.
Better transient response of the order of quarter cycle.
Reduction of harmonic filter capacity.
Reduction of size of high value air-cored reactor.
Reduction of equipment volume and foot-print.
22. Synchronous Condensor
A device whose main function is the improvement of pf
of the electrical system is known as the synchronous
condensor. It is installed at the receiving end of the line .
When a synchronous condensor is introduced it supplies
the kVAR to the system , and hence the current is
reduced .
Therefore the losses are reduced and provides a better
efficiency . Hence more power can be delivered to the
load and improves the pf of the system.
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23. CONCLUSION
From all the previous discussion we can
conclude reactive power compensation is a
must for improving the performance of the ac
system. By reactive power compensation we
can control the power factor and reduce the
consumption of electricity.
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24. References
[1] Juan Dixon and Luis Moran -“ Reactive Power
Compensation Technologies”.
[2] Yongan Deng -“ Reactive Power Compensation Of
Transmission Lines”.
[3] Hong Chan- “ Practices of Reactive Power
Management and Compensation”.
T.J Millen- “ Reactive Power Control in Electrical
Systems.”
Canadian Electrical Association-Static Compensators
For Reactive Power Control.