EP0047501A1
Expired / Lapsed
EP
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Multiterminal DC power transmission system
Assignee: Toshiba Corp
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Filing: 1981-09-03
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Granted: —
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Expires: 2001-09-03
Abstract
Abstract Control units (41, 42, 44, 45) are provided associative with forward and inverse converters (15, 16, and 28, 29) in a multiterminal DC power transmission system, respectively. The control units (41, 42, and 44, 45) set different constant voltages (Edp1 to Edp4) in the converters (15, 16, 28, 29). Further, the minimum value (Edp1) of the constant voltage set values in the forward converters (15, 16) is set at a value larger than the maximum value of the constant voltage set values in the inverse converters (28, 29).
Inventors
- 👤 Shoichi Irokawa
- 👤 Koji Imai
- 👤 Takeichi Sakurai
- 👤 Kiyoshi Goto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 00:47
CPC Classifications
H; H02; H02J; H02J3/00; H02J3/36; Y; Y02; Y02E; Y02E60/00; Y02E60/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A multiterminal DC power transmission system having a plurality of forward converters (15, 16) and inverse converters (28, 29), in which said forward and inverse converters (15, 16, 28, 29) are respectively provided with control units (41, 42, 44, 45) including constant voltage control means (412, 442), different constant voltages are set in said converters by said constant voltage control means (412, 442) and the minimum value (Edpl) of those constant voltage set values of said forward converters (15, 16) is larger than the maximum value (Edp3) of those constant voltage set values of said inverse converters (28, 29).
Claim 2
Dependent Claim
99 words
A multiterminal DC power transmission system having a plurality of forward converters (15, 16) and inverse converters (28, 29), in which said forward and inverse converters (15, 16, 28, 29) are respectively provided with control units (41, 42, 44, 45) including constant voltage control means (412, 442), different constant voltages are set in said converters by said constant voltage control means (412, 442) and the minimum value (Edpl) of those constant voltage set values of said forward converters (15, 16) is larger than the maximum value (Edp3) of those constant voltage set values of said inverse converters (28, 29).
Claim 3
Dependent Claim
104 words
A multiterminal DC power transmission system according to claim 1, in which said control units (41, 42) provided associative with said forward converters (15, 16) include each a first constant current control means (416) for controlling so that currents (Idl, Id2) exceed the first constant current set values (Idpl, Idp2) for voltage (Edl, Ed2) lower than the constant voltage set values (Edpl, Edp2), and a second constant current control means (412) for controlling so that the current (Idl, Id2) does not fall below second constant current set values (Idpl', Idp2') for a voltage (Edl, Ed2) higher than the constant voltage set values (Edpl, Edp2).
Claim 4
Dependent Claim
103 words
A multiterminal DC power transmission system according to claim 1 or 2, in which said control units provided with said inverse converters include each a third constant current control means (446) for controlling so that current (Id3, Id4) does not exceed a first current set value (Idp3, Idp4) for voltage (Ed3, Ed4) higher than the constant voltage set value (Edp3, Edp4), and a fourth constant current control means (447) for controlling so that the current (Id3, Id4) does not fall below a second constant current set value (Idp3', Idp4') for a voltage (Edp3, Edp4) lower than the constant voltage set values (Edp3, Edp4).
Claim 5
Dependent Claim
87 words
A multiterminal DC power transmission system according to claim 3, in which said control units (41, 42, 44, 45) include each a maximum value selecting circuit (413, 443) supplied with an output signal from said voltage control means (412, 442) and an output signal from said first constant current control means (416, 446), and a minimum value selecting circuit (418, 448) supplied with an output signal from said maximum value selecting circuit (413, 443) and an output signal from said second constant- current control means (417, 447).
Claim 6
Dependent Claim
32 words
A multiterminal DC power transmission system according to claim 4, in which said control units (41, 42, 44, 45) are each controlled by set value data from said central control unit (43).
References Cited (Backward Citations)
GB1241674A
Cited
GB2002974A
Cited
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