Presented by the hvdc light is a technology based on voltage sources converters vsc s which emphasizing the light weight and compactness features. Hvdc transmission systems and hvdc submarine power cables. New technology for a better environment presentation transcript. Currently, two viable power electronic device options exist, leading to two families of hvdc converters. Two technologies offered by the manufacturers are the hvdc light and the hvdc plus. Globally, there are over 200 high voltage direct current hvdc systems installed across continents. Igbts, the pwm technology can now be used for high power applications as electric power transmission. Apr 27, 2017 the new voltage sourced converter vsc technology was called hvdc light to resemble a more elegant, lighter and agile version of hvdc.
Comparison between conventional hvdc and hvdc light there are different basis on which conventional hvdc system and hvdc light can be compared. Principles of hvdc controls control of dc voltage dc voltage is varied by means of a converter bridge in rectifier operation the power flow is from the ac system to the dc system the power flow is changed from the dc system to the ac system by reversing the dc voltage. Mainly due to the extra conversion equipment and maintenance difficulty. High voltage dc hvdc transmission linkedin slideshare. Nov 27, 2011 hvdc, and recent improvements such as abbs hvdc light or siemens hvdc plus, are currently restricted to pointtopoint use, such as linking a huge, but remote, hydro electric plant to.
Hvdc lights black start capability means it can power up networks that have suffered a 100 percent failure. Hvdc light technology is not yet implemented in india but in australia, at direct link and murray link, we have two such examples where hvdc light technology with underground dccables has been implemented in a competitive, marketoriented network service. Hvdc electricity transmission is a proven technology with successful projects in operation around the world. Hvdc light technology free download as powerpoint presentation.
Direction of power flow can be changed very quickly. Abb and siemens in hvdc power race financial times. The hvdc link is a mean of transmission of electric power based on high power electronics. Ieee hvdc projects for btechhigh voltage direct current. Hvdc light is abbs vschvdc technology which offers many environmental benefits, including compact converter stations and invisible transmission. The correction equations of the newtonraphson method are deduced for ac grid, vsc and dc grid respectively. Hvdc light a new technology for a better environment. The new hvdc light cable is an extruded, singlepole cable. Light transmission system is modeled in matlab simpower systems software. New technologies, such as the vsc based hvdc systems, and the new extruded polyethylene dc cables, have made it possible for hvdc to become economic at lower power levels up to 200 mw and over a. Abb and hvdc the worlds first commercial highvoltage direct current hvdc link, situated between the swedish mainland and the island gotland, was delivered by abb already in the 1950s. Hvdc is used as an alternative to ac for transmitting electrical energy over long distances or between ac power systems of different frequencies. The trend continued into the 20th century but only in the 70s they gained momentum and became commercially attractive. We are ensuring security of supply, opening new markets, creating new opportunities for power trading and.
Contents introduction hvdc light technology hvdc light basic. The embedded hvdc system is an innovative concept which can be explained as an ac system consisting of hvdc links with at least two ends being physically connected within the synchronous ac network. Hvdc light is a high voltage, direct current transmission technology i. Download scientific diagram a schematic diagram of an hvdc light. High voltage direct current hvdc systems grid solutions. Hvdc light technology high voltage direct current electric power. What is hvdc light the hvdc light is a technology based on voltage sources converters vsc s which. These converter stations are compact and by virtue of their control they do not contribute to the short circuit levels. By interconnecting two ac grids, at these connection points it has become possible to exchange up to 220mw of power between each grid. Murraylink, the worlds longest underground highvoltage connection australia the murraylink 220 mw interconnector between the riverland in south australia and sunraysia in victoria is a 177 kilometre underground highvoltage power link. The increasing rating and improved performance of selfcommutated semiconductor devices have made possible high voltage dc hvdc transmission based on voltagesourced converter vsc. Therefore the hvdc technology acts as an increasingly important role in the electric power industry 3. Hvdc gaining ground growth in renewables driving hvdc deployment. Etap hvdc transmission link provides capabilities to simulate and analyze acdc electrical power grids.
The hvdc control and protection system is divided to two redundant systems a and b, based on an active standby concept. This document gives an overview of the hvdc protection. Hvdc systems remain the best economical and environmentally friendly option for the above conventional applications. Highvoltage direct current hvdc systems have become a viable option for accommodating bulk power transmission over long distance. Analysis of hvdc and hvdc light technology 715 figure 2. High voltage direct current hvdc systems enable utilities to move more power further, interconnect grids, integrate renewables, and improve network performance. High voltage direct current hvdc technology has provided the industry with a powerful tool to move a. Our engineers are actively developing a number of power transmission interconnector projects across europe. The integrated modeling of the hvdc link is utilized to analyze steadystate and dynamic behavior of acdc transmission networks, such as optimal power flows, contingency, shortcircuit, harmonics, protection, selectivity, and transient. The hvdc technology high voltage direct current is used to transmit electricity over long distances by overhead transmission lines or submarine cables. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The purpose of the hvdc protection system is to promptly remove main circuit equipment from service at short circuits or at abnormal operation that might cause damage or interfere with the operation of the neighbouring system. You can run the command by entering the following in the matlab command window.
Multivariable control with grid objectives of an hvdc link. If there is a surplus of generating capacity in either of the states grids it can be utilised in the others grid. Dec 06, 20 application based hvdc transmission types upto 3000 mw hvdc represents the most economical solution to transmit electrical energy over distances greater than approx. Hvdc light can be used with regular overhead transmission lines, but it reaches its full potential when used with a new kind of dc cable. Compared to ac, dc transmission has several advantages. Although the vast majority of power is transmitted via highvoltage alternating current ac lines, there are applications and situations where hvdc technology is preferred or even required. Load this model and save it in your working directory as case5 to allow further modifications to the original system. Influence of embedded hvdc transmission on ac network. A new voltage sourced converter or vsc solution using advanced power electronics for greater controllability, making smaller hvdc systems economical.
It consists of two ac to dc converter stations and a pair of underground cables interconnecting each converter station. Pdf the advantages and disadvantages of using hvdc to. The adobe flash plugin is needed to view this content. Traditional hvdc, or if you like hvdc heavy, is designed for high voltage, direct current. Siemens hvdc plus in hvdc plus the acdc conversion and vice versa is carried out by an igbt insulated gate bipolar transistor arrangement known as a power module. High voltage dc hvdc link software hvdc transmission. The converter stations are designed to be unmanned and virtually maintenancefree.
Economical even for shorter distances such as a few 10kmmiles 23. S time to connect 01 02 01 the gotland 1 valve hall from the 1950s. Hvdc light hvdc light is the newly developed hvdc transmission technology, which is based on extruded dc cables and voltage source converters consisting of insulated gate bipolar transistors igbts with high switching frequency. Hvdc overland links are usually bipolar, on overhead lines. Commercially, these products are available as hvdc light 6, hvdc plus 7 and hvdc maxsine 8. Abb ability brings together all of our digital products and services, each built from our unique combination of sector knowledge, technology leadership and digital expertise, to create real business value for our customers. Europagrid is an independent interconnector tso company specialising in the development subsea cross border hvdc interconnectors. New technologies, such as the vsc based hvdc systems, and the new extruded polyethylene dc cables, have made it possible for hvdc to become economic at lower power levels up to 200 mw and over a transmission distance of just 60 km. Hvdc circuit breakers are difficult some mechanism must be included in the circuit breaker to force current to zero. But as market and technology leaders, we are always looking for the next frontier. Hvdc, and recent improvements such as abbs hvdc light or siemens hvdc plus, are currently restricted to pointtopoint use, such as linking a. The area of application of both the systems varies and is one of the most demanded transmission system. Hvdc light a transmission vehicle with potential for. Voltage source converter hvdc links a the state of the.
Hvdc light technology is designed to transmit large quantities of power using underground cables and at the same time adds stability and power quality to the connected networks. It used less footprint and had less electric circuit equipment. They can serve as technically feasible solutions for connecting large offshore wind firms located farther than 70 km away from the coast. Comparison between hvdc light vsc and hvdc classic lcc. They have extended the use of hvdc down to blocks as small as a few tens of megawatts and overhead lines as short as a few dozen kilometers. Introduction hvdc light technology is designed to transmit large quantities of power using underground cables and at the same time adds stability and power quality to the connected networks.
Hvdc can carry more power for a given size of conductor 5. Thanks to its speed and flexibility, the hvdc technology is able to provide the transmission system advantages as transfer capacity enhancement and power flow control. Ppt hvdclight technology powerpoint presentation free to. The first generations of the hvdc light technology have been using pulse width modulation pwm and a twolevel or neutralpointclamped threelevel converter topology, whereas the new converters use a so called cascaded twolevel converters clt. Jun 07, 2012 the hvdc technology is used to transmit electricity over long distances by overhead transmission lines or submarines cables. This document gives an overview of the hvdc protection system. A schematic diagram of an hvdc light transmission system. It is written by group wps41050 during the period 8th of february 2nd of june 2010. Although the vast majority of power is transmitted via highvoltage alternating current ac lines, there are applications and situations where hvdc technology is. Pdf analysis and control of hvdc transmission power system.
Modeling and control of multiterminal vsc hvdc systems. Tracing the history of hvdc transmission november 2017 high voltage direct current hvdc technology has provided the industry with a powerful tool to move a. Vsc hvdc principles vsc hvdc is a generic name but most manufacturers try to use their brand name. Hvdc link upgrade with latest control and protection technology abb ability machenhancing power reliability and control denmark sweden norway abbs mach control and protection system will enable kontiskan 1 and kontiskan 2 to work together as a single system for the first time. Initially, it was used in power systems to interconnect asynchronous ac systems. Voltage source converters introduction circuit configurations converter operation real reactive power. Hvdc disadvantages hvdc is generally less reliable and has lower availability than hvac. Paper presented at 15th international workshop on largescale integration of wind power into power systems as well as on transmission networks for offshore wind power plants, vienna, austria, 1517 nov. Cable laying at sea for the cross sound cable, the worlds largest hvdc light project. High voltage dc hvdc link software hvdc transmission line.
Each rpc is located in the pole control level and operates independently from the rpc in the other end of the hvdc transmission. This presentation discusses highvoltage, direct current hvdc systems, and gives a comparison between the site aspects for hvdc light voltage source converter and hvdc classic line commutated converter methods for a 500mw 400kv hvdc transmission scheme. Hvdc systems utilize power electronics technology to convert ac and dc voltage, and are ideal for supporting existing systems or building new power highways. Hvdc light, based on vsc technology voltage sourced converter, is designed to transmit power underground and under water, also over long distances. Hvdclight technology ppt video online download slideplayer. Abb has participated in the delivery of more than half of the worlds around 170 hvdc links. Ppt risk based approach for development of offshore hvdc. Murraylink, the worlds longest underground highvoltage connection. These converter stations are compact and by virtue of their control they do. An hvdc converter converts electric power from high voltage alternating current ac to highvoltage direct current hvdc, or vice versa.
It is also used to interconnect separate power systems, where traditional alternating current ac connections can not be used. Hvdc converters capable of converting up to two gigawatts gw and with voltage ratings of. Each rpc is located in the pole control level and operates independently from the rpc in. Hvdc link upgrade with latest control and protection. Ground floor, drummond road, stafford, st16 3hj, united kingdom t. The present master thesis is conducted at the departament of energy technology, aalborg university.
Technology advance how from point to point connections to small hydro power solar power dc transmission wind power hydro 200 gw wind 300 gw. The dc and later the hvdc technology started to be used in power transmission at the end of the 19th century but only few lines and facilities were built, many of them experimental. When the technology was introduced it was based on a twolevel. Abb group leading digital technologies for industry. Hvdc plus works well with weak systems as it does not need any external. Application based hvdc transmission types hvdc is an alternative for submarine transmission. Ppt risk based approach for development of offshore hvdc transmission technologies powerpoint presentation free to download id. Hvdc transmission systems and hvdc submarine power cables in.
Hvdc is an established technology that has been in. A highvoltage, direct current hvdc electric power transmission system also called a power superhighway or an electrical superhighway uses direct current for the bulk transmission of electrical power, in contrast with the more common alternating current ac systems. The manufacturer abb group calls this concept hvdc light, while siemens calls a similar concept hvdc plus power link universal system and alstom call their product based upon this technology hvdc maxsine. The hvdc technology is used to transmit electricity over long distances by overhead transmission lines or submarines cables. The above presentation of characteristics and control. It was superior in its ability to control the alternate current ac voltage, phase angle and currents compared with the classic hvdc technology. The correction equations of the newtonraphson method. The thesis theme with the title control of vscbased hvdc transmission system for o shore wind power plants was chosen from the vestas student project catalogue. Principles of hvdc controls control of dc voltage dc voltage is varied by means of a converter bridge in rectifier operation the power flow is from the ac system to the dc. For longdistance transmission, hvdc systems may be less expensive and have lower electrical losses. Application based hvdc transmission types upto 3000 mw hvdc represents the most economical solution to transmit electrical energy over distances greater than approx. Hvac 3phase lower transmission loss because of no reactive loss lower insulationclearance of conductor dc voltage is about 71%. The murraylink project in australia uses abbs hvdc light technology. It is a high voltage, direct current transmission technology i.