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A high-voltage direct current (HVDC) system uses direct current (DC) and high voltages (currently between 100 kV and 800 kV) for electric power transmission. It contrasts with the more common alternating current (AC) transmission systems.
The analysis highlights History, Applications and Measurement as prominent areas in the source structure around High-voltage direct current.
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Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.
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See recurring relationship patterns around High-voltage direct current before inspecting the individual extracted relationships.
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TTTA extracted 22 structured relationships around High-voltage direct current. Examples in this analysis include mercury-arc valves and → instance of → These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… and wind into the main transmission grid → instance of → without increasing prospective short-circuit current.Integration of renewable resources. The table shows each extracted connection, where it came from and its confidence.
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| mercury-arc valves and | instance of | These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… | 0.80 | text |
| starting in the 1970s | instance of | These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… | 0.80 | text |
| power semiconductor devices including thyristors | instance of | These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… | 0.80 | text |
| integrated gate-commutated thyristors | instance of | These advantages led to early low-voltage DC transmission systems being supplanted by AC systems around the turn of the 20th century.Practical conversion of current between AC a… | 0.80 | text |
| wind into the main transmission grid | instance of | without increasing prospective short-circuit current.Integration of renewable resources | 0.80 | text |
| grading capacitors | instance of | Additional passive components | 0.80 | text |
| resistors need to be connected in parallel with each thyristor in order to ensure that the voltage across the valve is evenly shared between the thyristors | instance of | Additional passive components | 0.80 | text |
| the insulated-gate bipolar transistor | instance of | This is an important limitation in some circumstances.With some other types of semiconductor devices | 0.80 | text |
| 3rd or 5th harmonics.The task of designing AC harmonic filters for HVDC converter stations is complex | instance of | noncharacteristic harmonics | 0.80 | text |
| computationally intensive | instance of | noncharacteristic harmonics | 0.80 | text |
| since in addition to ensuring that the converter does not produce an unacceptable level of voltage distortion on the AC system | instance of | noncharacteristic harmonics | 0.80 | text |
| it must be ensured that the harmonic filters do not resonate with some component elsewhere in the AC system | instance of | noncharacteristic harmonics | 0.80 | text |
The concept neighborhoods around High-voltage direct current bring nearby vocabulary together. In this analysis, examples include Ac, Power and Transmission. Use the clusters to find adjacent concepts and terminology that may deserve separate research.
For High-voltage direct current, one of the stronger structural bridges in this analysis connects High-voltage direct current with Overview. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.
TTTA analyzes the structure around High-voltage direct current to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, Applications & Measurement, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.
Source: Wikipedia — High-voltage direct current · EN edition · Analysis: TopicsToTalkAbout