What is VSC in HVDC system?
Abstract: The forced switching converters are a new version of the High Voltage Direct Current (HVDC) technology that uses voltage source converters (VSC), which are based mainly on insulated gate bipolar transistors (IGBT). VSCs utilize a power electronic valve with both turn‐on and turn‐off capability.
Which converter is used in HVDC transmission?
Converter Unit In HVDC transmission a 12-pulse bridge converter is used. The converter obtains by connecting two or 6-pulse bridge in series.
For what purpose is HVDC transmission used?
A high-voltage, direct current (HVDC) electric power transmission system (also called a power superhighway or an electrical superhighway) uses direct current (DC) for the bulk transmission of electrical power, in contrast with the more common alternating current (AC) systems.
Which power device is used in HVDC?
The technological advancement of thyristor (THY) and isolated gate bipolar transistor (IGBT) has accelerated the growth of Line-commutated converter (LCC)/Current-sourced converter (CSC)-HVDC and voltage-sourced converter (VSC)-HVDC systems, respectively.
Where is HVDC used in India?
The HVDC Rihand–Delhi is a HVDC connection between Rihand and Dadri (near Delhi) in India, put into service in 1990. It connects the 3,000 MW coal-based Rihand Thermal Power Station in Uttar Pradesh to the northern region of India….
| HVDC Rihand–Delhi | |
|---|---|
| Location | |
| No. of poles | 2 |
When was HVDC invented?
1882
The first successful HVDC experimental long distance line (37 miles) was made at Munich, Germany in 1882 by Oskar Von Miller and fellow engineers.
What are the special features of converters in HVDC transmission?
Almost all HVDC converters are inherently bi-directional; they can convert either from AC to DC (rectification) or from DC to AC (inversion). A complete HVDC system always includes at least one converter operating as a rectifier (converting AC to DC) and at least one operating as an inverter (converting DC to AC).
What are the main components of HVDC transmission?
The essential components in a HVDC transmission system are 6/12/24 pulse converters, converter transformer with suitable ratio and tap changing, filters at both DC and AC side, smoothening reactor in DC side, shunt capacitors and DC transmission lines.
What are the application of HVDC?
Applications of HVDC technologies include water crossings, asynchronous interconnections (back-to- back), bulk power transfers including access to remote renewables (point-to-point), transmission in areas with severely restricted ROWs, and HVDC networked grids (multi-terminal).
Which is better HVAC or HVDC?
An HVDC line has considerably lower losses compared to HVAC over longer distances. Controllability: Due to the absence of inductance in DC, an HVDC line offers better voltage regulation. Interference with nearby communication lines is lesser in the case of HVDC overhead line than that for an HVAC line.
What are the disadvantages of HVDC system?
Disadvantage #1 (expensive) Converter stations needed to connect to AC power grids are very expensive. Converter substations are more complex than HVAC substations, not only in additional converting equipment, but also in more complicated control and regulating systems.
Which is the first HVDC scheme in India?
Rihand-Dadri
HVDC links in India The first HVDC link to be commissioned in the country was Rihand-Dadri [1] in 1991 connecting Thermal power plant in Rihand, Uttar Pradesh (Eastern Part of Northern Grid) with Dadri (Western Part of Northern Grid).
How are CSC and VSC used in HVDC transmission?
Current source converter (CSC) (top) and voltage source converter (VSC) (bottom) based high-voltage DC (HVDC) transmission systems. The traditional HVDC system shown at the top of Fig. 16.2 makes use of thyristors with line-commutation to control current flow.
How is the power of a HVDC transmission controlled?
The power transmitted over the HVDC transmission is controlled by means of a control system. It adjusts the triggering instants of the thyristor valves to obtain the desired combination of voltage and current in the DC system.
Which is the voltage source converter for HVDC?
With the development of the IGBT, the voltage source converter (VSC) technology has been developed by ABB for HVDC systems where series connection of IGBTs enables to reach the required high DC transmission voltage [86,87]. Fig. 17.7. Evolution of HVDC converter topologies versus power device technologies.
What kind of cables are used for HVDC?
This is a list of notable high-voltage direct-current power transmission projects. HVDC projects for long-distance transmission have two (or rarely, more) converter stations and a transmission line interconnecting them. Generally overhead lines are used for interconnection, but an important class of HVDC projects use submarine power cables.