The Solar System[c] is the gravitationally bound system of the Sun and the objects that orbit it. The largest of such objects are the eight planets, in order from the Sun: four terrestrial planets named Mercury, Venus, Earth and Mars, two gas giants named Jupiter and Saturn, and two ice giants named Uranus and Neptune. The terrestrial planets have a definite surface and are mostly made of rock and metal. The gas giants are mostly made of hydrogen and helium, while the ice giants are mostly made of 'volatile' substances such as water, ammonia, and methane. In some texts, these terrestrial and giant planets are called the inner Solar System and outer Solar System planets respectively.
I have created this report for my final semester seminar at Poornima college of engineering Jaipur, electrical department. This report covers various chapters and other contents. feel free to download.
Note: some minor editsin format and a quick spelling check might be needed.
**content source is wikipedia and internet**
any thing you would like to suggest please let me know in the comments.
Alternating current (AC) is the main driving force in the industries and residential areas, but for the long transmission line (more than 650 KM) AC transmission is more expensive than that of direct current (DC). Technically, AC transmission line control is more complicated because of the frequency. DC transmission does not have these limitations, which has led to build long HVDC transmission lines over the last 40 years. HVDC technology made possible to transfer bulk power over long distances.
High Voltage Direct Current Transmission SystemNadeem Khilji
The development of HVDC (High Voltage Direct Current) transmission system dates back to the 1930s when mercury arc rectifiers were invented. Since the 1960s, HVDC transmission system is now a mature technology and has played a vital part in both long distance transmission and in the interconnection of systems. Transmitting power at high voltage and in DC form instead of AC is a new technology proven to be economic and simple in operation which is HVDC transmission. HVDC transmission systems, when installed, often form the backbone of an electric power system. They combine high reliability with a long useful life. An HVDC link avoids some of the disadvantages and limitations of AC transmission. HVDC transmission refers to that the AC power generated at a power plant is transformed into DC power before its transmission. At the inverter (receiving side), it is then transformed back into its original AC power and then supplied to each household. Such power transmission method makes it possible to transmit electric power in an economic way.
High Voltage Direct Current Transmission System ReportNadeem Khilji
The development of HVDC (High Voltage Direct Current) transmission system dates back to the 1930s when mercury arc rectifiers were invented. Since the 1960s, HVDC transmission system is now a mature technology and has played a vital part in both long distance transmission and in the interconnection of systems. Transmitting power at high voltage and in DC form instead of AC is a new technology proven to be economic and simple in operation which is HVDC transmission. HVDC transmission systems, when installed, often form the backbone of an electric power system. They combine high reliability with a long useful life. An HVDC link avoids some of the disadvantages and limitations of AC transmission. HVDC transmission refers to that the AC power generated at a power plant is transformed into DC power before its transmission. At the inverter (receiving side), it is then transformed back into its original AC power and then supplied to each household. Such power transmission method makes it possible to transmit electric power in an economic way.
Introduction, equipment required for HVDC systems, Comparison of AC and DC Transmission, Limitations of HVDC transmission lines, reliability of HVDC systems, comparison of HVDC link with EHVAC link, HVDC system configuration and components, fundamental equations in HVDC system, HVDC links, converter theory and performance equation, valve characteristic, converter circuits, converter transformer testing, multi bridge converters, abnormal operation of HVDC system, control of HVDC system, harmonics and filters. Influence of AC system strength on AC/DC system interaction, response to AC and DC system faults, Concept of reactive power compensation- reactive Power balance in HVDC substations-Effect of angle of advance and extinction angle on reactive power requirement of converters.
HVDC AND FACTS -4th Year HVDC transmission uses technology developed extensi...ShaikFarooq31
form of HVDC transmission uses technology developed extensively in the 1930s in Sweden (ASEA) and in Germany. Early commercial installations included one in the Soviet Union in 1951 between Moscow and Kashira, and a 100 kV, 20 MW system between Gotland and mainland Sweden in 1954.[8] Before the Chinese project of 2019, the longest HVDC link in the world was the Rio Madeira link in Brazil, which consists of two bipoles of ±600 kV, 3150 MW each, connecting Porto Velho in the state of Rondônia to the São Paulo area with a length of more than 2,500 km (1,600 mi).[9]
HVDC (high-voltage direct current) is a highly efficient alternative for transmitting large amounts of electricity over long distances and for special purpose applications.
Applications of power electronics in HVDCKabilesh K
Role of Power electronics in HVDC and Transmission system. What are the components of Power electronics used in HVDC. Types of HVDC Links. Advantages of HVDC over HVAC.
2137ad Merindol Colony Interiors where refugee try to build a seemengly norm...luforfor
This are the interiors of the Merindol Colony in 2137ad after the Climate Change Collapse and the Apocalipse Wars. Merindol is a small Colony in the Italian Alps where there are around 4000 humans. The Colony values mainly around meritocracy and selection by effort.
I have created this report for my final semester seminar at Poornima college of engineering Jaipur, electrical department. This report covers various chapters and other contents. feel free to download.
Note: some minor editsin format and a quick spelling check might be needed.
**content source is wikipedia and internet**
any thing you would like to suggest please let me know in the comments.
Alternating current (AC) is the main driving force in the industries and residential areas, but for the long transmission line (more than 650 KM) AC transmission is more expensive than that of direct current (DC). Technically, AC transmission line control is more complicated because of the frequency. DC transmission does not have these limitations, which has led to build long HVDC transmission lines over the last 40 years. HVDC technology made possible to transfer bulk power over long distances.
High Voltage Direct Current Transmission SystemNadeem Khilji
The development of HVDC (High Voltage Direct Current) transmission system dates back to the 1930s when mercury arc rectifiers were invented. Since the 1960s, HVDC transmission system is now a mature technology and has played a vital part in both long distance transmission and in the interconnection of systems. Transmitting power at high voltage and in DC form instead of AC is a new technology proven to be economic and simple in operation which is HVDC transmission. HVDC transmission systems, when installed, often form the backbone of an electric power system. They combine high reliability with a long useful life. An HVDC link avoids some of the disadvantages and limitations of AC transmission. HVDC transmission refers to that the AC power generated at a power plant is transformed into DC power before its transmission. At the inverter (receiving side), it is then transformed back into its original AC power and then supplied to each household. Such power transmission method makes it possible to transmit electric power in an economic way.
High Voltage Direct Current Transmission System ReportNadeem Khilji
The development of HVDC (High Voltage Direct Current) transmission system dates back to the 1930s when mercury arc rectifiers were invented. Since the 1960s, HVDC transmission system is now a mature technology and has played a vital part in both long distance transmission and in the interconnection of systems. Transmitting power at high voltage and in DC form instead of AC is a new technology proven to be economic and simple in operation which is HVDC transmission. HVDC transmission systems, when installed, often form the backbone of an electric power system. They combine high reliability with a long useful life. An HVDC link avoids some of the disadvantages and limitations of AC transmission. HVDC transmission refers to that the AC power generated at a power plant is transformed into DC power before its transmission. At the inverter (receiving side), it is then transformed back into its original AC power and then supplied to each household. Such power transmission method makes it possible to transmit electric power in an economic way.
Introduction, equipment required for HVDC systems, Comparison of AC and DC Transmission, Limitations of HVDC transmission lines, reliability of HVDC systems, comparison of HVDC link with EHVAC link, HVDC system configuration and components, fundamental equations in HVDC system, HVDC links, converter theory and performance equation, valve characteristic, converter circuits, converter transformer testing, multi bridge converters, abnormal operation of HVDC system, control of HVDC system, harmonics and filters. Influence of AC system strength on AC/DC system interaction, response to AC and DC system faults, Concept of reactive power compensation- reactive Power balance in HVDC substations-Effect of angle of advance and extinction angle on reactive power requirement of converters.
HVDC AND FACTS -4th Year HVDC transmission uses technology developed extensi...ShaikFarooq31
form of HVDC transmission uses technology developed extensively in the 1930s in Sweden (ASEA) and in Germany. Early commercial installations included one in the Soviet Union in 1951 between Moscow and Kashira, and a 100 kV, 20 MW system between Gotland and mainland Sweden in 1954.[8] Before the Chinese project of 2019, the longest HVDC link in the world was the Rio Madeira link in Brazil, which consists of two bipoles of ±600 kV, 3150 MW each, connecting Porto Velho in the state of Rondônia to the São Paulo area with a length of more than 2,500 km (1,600 mi).[9]
HVDC (high-voltage direct current) is a highly efficient alternative for transmitting large amounts of electricity over long distances and for special purpose applications.
Applications of power electronics in HVDCKabilesh K
Role of Power electronics in HVDC and Transmission system. What are the components of Power electronics used in HVDC. Types of HVDC Links. Advantages of HVDC over HVAC.
2137ad Merindol Colony Interiors where refugee try to build a seemengly norm...luforfor
This are the interiors of the Merindol Colony in 2137ad after the Climate Change Collapse and the Apocalipse Wars. Merindol is a small Colony in the Italian Alps where there are around 4000 humans. The Colony values mainly around meritocracy and selection by effort.
Explore the multifaceted world of Muntadher Saleh, an Iraqi polymath renowned for his expertise in visual art, writing, design, and pharmacy. This SlideShare delves into his innovative contributions across various disciplines, showcasing his unique ability to blend traditional themes with modern aesthetics. Learn about his impactful artworks, thought-provoking literary pieces, and his vision as a Neo-Pop artist dedicated to raising awareness about Iraq's cultural heritage. Discover why Muntadher Saleh is celebrated as "The Last Polymath" and how his multidisciplinary talents continue to inspire and influence.
Hadj Ounis's most notable work is his sculpture titled "Metamorphosis." This piece showcases Ounis's mastery of form and texture, as he seamlessly combines metal and wood to create a dynamic and visually striking composition. The juxtaposition of the two materials creates a sense of tension and harmony, inviting viewers to contemplate the relationship between nature and industry.
2137ad - Characters that live in Merindol and are at the center of main storiesluforfor
Kurgan is a russian expatriate that is secretly in love with Sonia Contado. Henry is a british soldier that took refuge in Merindol Colony in 2137ad. He is the lover of Sonia Contado.
1. DEPARTMENT OF ELECTRICAL
ENGINEERING
IFTM UNIVERSITY
MORADABAD
A
Presentation
On
HVDC System
Guide By:- Submitted By:-
Mr. Vinod Shrivastava Ankit Kumar-15049028
Assistant Professor Ankit Kumar-15049029
Ankit Kumar-15049030
Ankit Kumar-15049031
Ankit Kumar-15049032
2. HVDC stands for High Voltage Direct Current
and
is today a well-proven technology employed for
power transmission all over the world.
HVDC technology is used to transmit electricity
over long distances by overhead transmission
lines or submarine cables.
It is also used to interconnect separate power
systems, where traditional alternating current
(AC) connections can not be used.
4. HVDC links can be broadly
classified
into:
Monopolar links
Bipolar links
Homopolar links
5. It uses one conductor .
The return path is provided by ground or water.
Use of this system is mainly due to cost considerations.
A metallic return may be used where earth resistivity is too high.
This configuration type is the first step towards a bipolar link.
6. Each terminal has
two convertersof equal
rated voltage, connected in
series on the DC side.
The junctions between the
converters is grounded.
If one pole is isolated due to fault, the other pole can
operate with ground and carry half the rated load (or
more using overload capabilities of its converter line).
7. It has two or more conductors all having the same
polarity, usually negative.
Since the corona effect in DC transmission lines is
less for negative polarity, homopolar link is usually
operated with negative polarity.
The return path for such a system is through ground.
8. 1. Converters
2. Smoothing reactors
3. Harmonic filters
4. Reactive power supplies
5. Electrodes
6. DC lines
7. AC circuit breakers
Components of HVDC [2]
9. Objectives of Control
◦ Efficient and stable operation.
◦ Maximum flexibility of power control without
compromising the safety of equipment.
◦ Principle of operation of various control
systems.
◦ Implementation and their performance during
normal and abnormal system conditions.
10. Direct current from the rectifier to the inverter
ci
d
Rcr Rl R
Vdor Vdoi
I
cos cos
Power at the rectifier terminal
Pd r V d r I d
Power at the inverter terminal
2
Pd i V d i I d Pd r
R L I d
Schematic diagram of control [2]
11. This can be accomplished by:
◦ Controlling firing angles of the rectifier and
inverter (for fast action).
◦ Changing taps on the transformers on the AC
side (slow response).
Power reversal is obtained by reversal of polarity of
direct voltages at both ends.
Internal voltages V dor cos and Vdoi cos can used be
controlled to control the voltages at any point on
the line and the current flow (power).
12. Power control
To transmit a scheduled power, the corresponding
current order is determined by:
Bridge/converter unit control
Determines firing angles and sets their limits.
Pole control
It coordinates the conversion of current order to a
firing angle order, tap changer control and other
protection sequences.
Iord
Po /Vd
14. HVDC links can stabilize AC system frequencies and
voltages and help with unplanned outages.
Renewable electricity superhighways in Smaller scale
use.
A 500 V,1500 W,810Km bipolar HVDC transmission line
is set up between Rihand & Delhi.
In Vindhyachal back to back link is laid for exchange of
power between Northern & Western regions.
15. •For equivalent transmission capacity, a
DC line has lower construction costs than
an AC line.
•A double HVAC three-phase circuit with 6
conductors is needed to get the reliability
of a two-pole DC link.
•DC requires less insulation.
•For the same conductor, DC losses are
less, so other costs, and generally final
losses too, can be reduced.
•An optimized DC link has smaller towers
than an optimized AC link of equal
capacity.
Price vs distance [2]
16. Reactive power requirement
System stability
Short Circuit Current
Independent Control of ac system
Fast change of energy flow
Lesser Corona Loss and Radio interference
Greater Reliability.
17. • DC lines and cables are cheaper than ac lines or
cables.
• The towers of the dc lines are narrower, simpler
and cheaper compared to the towers of the ac
lines.
• Line losses in a dc line are lower than the losses in
an ac lines.
19. The disadvantages of HVDC are in conversion, switching
and control.
Expensive inverters with limited overload capacity.
Higher losses in static inverters at smaller transmission
distances.
The cost of the inverters may not be offset by reductions
in line construction cost and lower line loss.
High voltage DC circuit breakers are difficult to build
because some mechanism must be included in the circuit
breaker to force current to zero, otherwise arcing and
contact wear would be too great to allow reliable
switching.
20.
application of HVDC.
Very large investments in e.g in China and India
shows that high-voltage direct current will very
important in the future, especially in big, new-
industries countries.
Recent studies indicate that HVDC systems are very
reliable.
The data collected from 31 utilities says that forced
unavailability of energy due to the converter station is
1.62%.
The scheduled unavailability of energy is about
5.39%.
21. [1] Lips H P. “Aspects of multiple in feed of HVDC
inverter station into a common AC system”, IEEE
Trans. on Power Apparatus Sys. vol .2,pp 135-141,
1973
[2] Xiao Wang, Boon-Tech Ooi. "High Voltage Direct
Current Transmission System Based on Voltage
Source Converters", IEEE Trans.on HVDC Sys.
vol.1,pp. 325-332,1990
[3] R. N. Nayak, R. P. Sasmal, Y. K. Sehgal, et al, "AC/DC
interactions in multi-infeed HVDC scheme: a case
study," IEEE Power India Conference, pp. 5-9, 2006