Benefits / Advantages Of HVDC Technology To ABB And SIEMENS
HVDC technology, being the most energy-efficient and reliable way of transmitting a long distant bulk electricity was developed by some companies like ABB, SIEMENS and ASEA, AEG, BBC etc. Siemens company call this concept ''HVDC PLUS'' while ABB maker calls a similar idea ''HVDC Light''. A lot more than 50 years ago, ABB developed HVDC technology to be able to increase the power transmitting efficiency over long distances and to improve the steadiness of voltages in electric power network. This poses many benefits to ABB and the entire world at large. In order to cope with the new difficulties worldwide, SIEMENS also developed a remedy known as HVDC PLUS; this can help protect the local climate by restricting the emissions of skin tightening and and by maximum use of energy resources.
HVDC weighed against the conventional alternating electric current (AC) transmission technology will not lose less electricity. Another major advantage of HVDC technology is that it's able to connect AC power systems which can be incompatible therefore increasing the efficiency and balance of every component/ network. Also the electromagnetic fields of HVDC are negligible. It requires lesser transmitting lines, hence the need for small space. The technology is very cheaper over long ranges, since special equipment must convert electricity from alternating current to direct current.
ABB HVDC Light
In 1954, ABB sent the first assembly to convey power between your Swedish mainland and the Gotland Island, and has since led the introduction of HVDC. In the 1990's, a further progression was achieved with the development of HVDC Light, the technology found in Eslink.
HVDC Light is so far the most interesting electricity transmission technology worldwide, developed for a number of generations. HVDC Lightis a state-of-the-art ability system which is developed to transfer electric power underground and under normal water, also over long ranges. It is currently offered in lower electric power amounts (10-1, 100 Megawatts), set alongside the other HVDC systems at (300-5, 000 Megawatts). Like the traditional HVDC method, the new technology offers similar benefits and provides more secure ability control and faster electricity restoration regarding blackout. Additionally, it may stabilize the unsteadiness in power level and make it a practical technology for stabilizing irregular electricity moves, for case, those produced by wind flow farms, which has the capability to upset power systems.
HVDC Light is eventually a friendly technology, having oil-free cables, small converter stations and cables that can be buried underground as well as underwater. It is recognised as the only technology that allows long-distance underground high-voltage transmission. It provides numerous environmental benefits, such as neutral electromagnetic areas, "invisible" electricity lines, compact converter stations and oil-free cords. Another benefit produced from this technology is that it is quick to set up and another option to the traditional AC transmitting method and local technology. HVDC Light increases the reliability of vitality grids, and the technology extends the economical vitality selection of HVDC transmission right down to simply a few tens of Megawatts. Some of the useful applications include:
- Connecting wind farms to electric power grids
- Underground power links
- Providing shore power equipment to islands and just offshore petrol & gas platforms
- Connecting asynchronous grids
- City centre in-feed
SIEMENS HVDC PLUS (VSC Technology)
The Siemens HVDC PLUS is a recently introduced technology in neuro-scientific HVDC transmission systems and paves way for new domains of the proven HVDC technology. Its recently development offers both technical and economical advantages. Through the utilization of a new idea of modular multilevel voltage-sourced converters, HVDC PLUS is the favorite solution where scarcity of space is a solution. It is ideal for connection of distant offshore programs and breeze farms to the onshore grid as well for power supply high-density areas such as mega locations. In regards to to system security, HVDC PLUS enhances the performance of the transmission grid
As an development innovator in HVDC transmission, Siemens developed HVDC PLUS, an advanced and universally applicable solution for power transmission in the number up to thousand megawatts or higher.
Benefits
Technological Aspects
Some of the technical importance/benefits of HVDC PLUS are the following:
- It can be managed in AC grids with extremely low short-circuit levels or with passive loads.
- It has indie control of dynamic and reactive vitality (full four quadrant operation).
- It can be connected to blacked-out systems and re-energize them.
- It can be run within an unsymmetrical network (e. g. during AC network faults) and it offers unbalance control to pay unsymmetrical loads.
- With respect to reactive vitality and offshore voltage control for poor AC grids, it's very flexible.
- It is powerful regarding AC network faults, fault-ride through potential and it assists as firewall for restriction of spread of system disruptions.
- It is completely relevant for Back-to-Back software as well as for long-distance-transmission with DC wires or with DC overhead-line.
Economical Aspects
The VSC technology offers a straight forward AC side interconnection. The modular multilevel converter principle renders AC harmonic filtration systems superfluous. A standard transformer design can be used without special requirements to resist DC voltage or harmonic currents. The converter does not produce any significant high occurrence noise, so outdoor installing AC- and DC reactors (if necessary) and switchgear is feasible. The modular rack-type converter design provides flexibility regarding building height versus -duration. It allows to lessen building height compared to normal HVDC converters. The converter modules are handled with a minimal switching frequency resulting in low converter deficits. The converter and the control equipment are designed with a high level of component redundancy.
The features of HVDC PLUS are:
- Low space requirements
- Low level of the installation
- Short assembly and commissioning period
- Lower losses in comparison to 2 and 3-level converters
- High Reliability
As the power industry strives to reduce its environmental effects by utilizing more green energy resources (e. g. large blowing wind farms) the transmission system owners face the difficulties of integrating these often remote and fluctuating energy options in to the grid.
HVDC PLUS is the key method for these problems which impede the take-up of green energies. In this regard the possibilities to use with low short-circuit levels, the tiny footprint, and the indie control of MW and Mvar are of specifically advantages. With HVDC PLUS, islanded systems, such as oil and gas platforms as well as mines, can be linked with no need for local generation which is less reliable. This helps reduce the CO2emissions.
Applications
HVDC PLUS has an array of applications. In particular, it aspires to load the gap searching for flexible DC answers to simplify the grid gain access to of remote or renewable energy resources.
- Submarine DC Transmission
- Back-to-Back Transmission
- Overhead Line Transmission
- Offshore Applications
Multiterminal Configuration
In summary, the ABB's HVDC Light converter consists of two-level three-phase bridge with six valves, each comprising series-connected IGBTs. Siemens HVDC Plus system is a fresh technology of converters using voltage-sourced converter technology and IGBTs. The HVDC Plus and HVDC Light systems offer several advantages including less space requirements, way to obtain very fragile systems and black-start capacity that allows restarting a collapsed network. Systems such as HVDC Plus and HVDC Light are well suited for DC links in the reduced to medium electric power range application up to 1 1, 000MW and relatively shorter ranges (a huge selection of kilometres). Presently various companies are developing IGBT devices for higher electric power applications
References
W. Breuer, D. Povh, D. Retzmann, E. Teltsch X. Lei, (2004)''Role of HVDC and FACTS in future Electric power Systems'', Siemens AG, Germany XJ Group, China
D. Retzmann, K. Uecker (2007), Great things about HVDC and FACTS for Sustainability and Security of Ability Systems
B. Ehmcke, C. O. Klermund, D. Povh, (1998), "Tech and Economical Areas of System Interconnection", [The 4th Afro-Asian International Meeting, 12 -15, Cairo, Egypt]
A. Menze et al. , (2002) "New HVDC Power Links between UCTE and NORDEL - Analysis of AC/DC Connections in the Time and Consistency Domains", [CIGRE Article 38-207, Session
