CN101902041A - 400 kV + 400 kV + 200 kV series +/- 1000 kV DC converter wiring scheme - Google Patents
400 kV + 400 kV + 200 kV series +/- 1000 kV DC converter wiring scheme Download PDFInfo
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- CN101902041A CN101902041A CN 201010160277 CN201010160277A CN101902041A CN 101902041 A CN101902041 A CN 101902041A CN 201010160277 CN201010160277 CN 201010160277 CN 201010160277 A CN201010160277 A CN 201010160277A CN 101902041 A CN101902041 A CN 101902041A
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Abstract
The invention discloses a 400 kV + 400 kV + 200 kV series +/-1000 kV DC converter wiring scheme, belonging to the field of high-voltage DC transmission. The invention aims at solving the problems of difficult design, manufacturing and transmission caused by the cooccurrence of great converter transformer capacity and high insulation level. The invention adopts the technical scheme that a 200 kV converter is selected as a high-end converter, and two 400 kV converters are selected as a middle-end converter and a low-end converter. Smoothing reactors are arranged in three parts, and the inductance ratio of the three smoothing reactors is 1:2:2 and is matched to the voltage distribution of the converters. Thus, the 12-pulsed harmonic wave at the low-voltage end of each converter is ensured to be zero in theory during normal operation, and the insulation level at the valve side of a converter transformer is reduced. After the 200 kV converter fails and is removed, the wiring of the DC system adopts the wiring scheme of +/- 800 kV DC transmission engineering, and the equipment design and the manufacturing experience of the +/-800 kV DC transmission engineering can be referenced.
Description
Technical field
The invention belongs to the high-voltage dc transmission electrical domain, relate to a kind of connection plan of ± 1000kV extra-high voltage direct-current transmission engineering converter.
Background technology
In the conventional high voltage direct current transmission project of China, adopt ETT or the LTT thyristor of 5 inches of diameters, 3000A mostly.At present, 6 inches of diameters, 4750A thyristor element have not had obstacle technically, can drop into the industry operation.In order to compare, 2 heavy valves and 4 heavy valves have been designed based on two kinds of elements with the converter valve that adopts 5 inches thyristors.Calculating shows, adopts 6 inches thyristors, and the direct current system performance has obtained comprehensive lifting, can reduce the short-circuit reactance that the change of current becomes, and reduces the idle configuration at converter reactive power consumption and station.The overload capacity of direct current system and margin of safety have had significantly improvement simultaneously.And overall cost also descends to some extent with respect to 5 inches thyristor converter valves.
Because 6 inches thyristor rated current has reached 4750A, needn't solve the problem of big direct current by the converter parallel connection,, also increased the loss of DC line simultaneously if increase direct current again.In ± 800kV extra-high voltage direct-current transmission engineering, mainly be high voltage, jumbo problem, therefore, selected the converter wiring mode of 12 pulse conversion devices series connection, improve the voltage and the capacity of extra-high voltage direct-current transmission by the converter series connection.
At ± the 1000kV extra-high voltage DC transmission system, if guarantee that high-end converter converter transformer capacity and insulation level satisfy condition simultaneously, then manufacture and design the corresponding increasing of difficulty simultaneously.Adopt the double converter series system, converter capacity and insulation level all are higher than engineering in the past, except that manufacture and design difficulty huge, also improved transport difficulty.
Summary of the invention
At the blank of prior art in ± 1000kV extra-high voltage direct-current transmission field, the objective of the invention is to, a kind of three converter tandem plans are provided, can reduce the capacity of the high converter transformer of insulation level, increase the capacity of the low converter transformer of insulation level, help to solve the problem that manufactures and designs difficulty that causing appears in high converter transformer capacity and big insulation level simultaneously.
To achieve these goals, the technical solution used in the present invention is to adopt " 400kV+400kV+200kV " tandem type ± 1000kV DC converter wiring scheme, promptly select 200kV capacity converter as high-end converter, and select two 400kV converters respectively as middle-end and low side converter.
Corresponding " 400kV+400kV+200kV " scheme, smoothing reactor is arranged in three places, and the ratio of inductance value is 1: 2: 2, and distributing with converter voltage is complementary, each converter low-pressure end 12 pulsation harmonic wave is zero in the time of can guaranteeing in theory normally to move, and reduces the insulation level that the change of current becomes the valve side.
After the 200kV converter fault withdrawed from, the direct current system wiring was ± 800kV DC transmission engineering connection plan, and insulation level is suitable substantially, can be with reference to the device design and the manufacturing experience of ± 800kV DC transmission engineering.
Description of drawings
Accompanying drawing is the main electrical scheme schematic diagram of of the present invention ± one pole of 1000kV DC converter.
Symbol among the figure is represented respectively:
AC---current conversion station ac bus;
T
1, T
2, T
3---high-end, middle-end, low side converter transformer;
V
1, V
2, V
3---high-end, middle-end, low side converter valve;
Q
1, Q
2, Q
3---the circuit breaker of converter parallel connection;
L
1, L
2, L
3---smoothing reactor
S---isolating switch
DC---DC line
Embodiment
The invention will be further described according to instantiation that technique scheme is finished below in conjunction with accompanying drawing and inventor.
Each converter low-pressure end 12 pulsation harmonic wave is 0 when guaranteeing normally to move, and reduces the insulation level of converter transformer valve side, and smoothing reactor is arranged in three places, and the ratio of inductance value is 1: 2: 2, and distributing with converter voltage is complementary.
Adopt behind the 200kV converter fault isolating switch S
11, S
12Disconnect S
13Remain closed, the direct current system wiring is ± 800kV DC transmission engineering connection plan, and insulation level is suitable substantially, can be with reference to the device design and the manufacturing experience of ± 800kV DC transmission engineering.
Claims (3)
1. the connection plan of one kind ± 1000kV DC converter is characterized in that, adopts three 12 pulse conversion device series connection; " 400kV+400kV+200kV " type of employing tandem plan is promptly selected 200kV capacity converter as high-end converter, and is selected two 400kV converters respectively as middle-end and low side converter.
2. smoothing reactor is arranged in three places, and the ratio of inductance value is 1: 2: 2, and distributing with converter voltage is complementary.
3. after the 200kV converter fault withdrawed from, the direct current system wiring was ± 800kV DC transmission engineering connection plan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010160277 CN101902041A (en) | 2010-04-30 | 2010-04-30 | 400 kV + 400 kV + 200 kV series +/- 1000 kV DC converter wiring scheme |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010160277 CN101902041A (en) | 2010-04-30 | 2010-04-30 | 400 kV + 400 kV + 200 kV series +/- 1000 kV DC converter wiring scheme |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101902041A true CN101902041A (en) | 2010-12-01 |
Family
ID=43227338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010160277 Pending CN101902041A (en) | 2010-04-30 | 2010-04-30 | 400 kV + 400 kV + 200 kV series +/- 1000 kV DC converter wiring scheme |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101902041A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3641356A (en) * | 1970-02-19 | 1972-02-08 | Asea Ab | Static converter station for high voltage |
| CN101297469A (en) * | 2006-01-18 | 2008-10-29 | Abb技术有限公司 | A transmission system and a method for control thereof |
-
2010
- 2010-04-30 CN CN 201010160277 patent/CN101902041A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3641356A (en) * | 1970-02-19 | 1972-02-08 | Asea Ab | Static converter station for high voltage |
| CN101297469A (en) * | 2006-01-18 | 2008-10-29 | Abb技术有限公司 | A transmission system and a method for control thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20101201 |