CN101364720A - DC bipolar half voltage overload ice melting method - Google Patents
DC bipolar half voltage overload ice melting method Download PDFInfo
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- CN101364720A CN101364720A CNA2008100845820A CN200810084582A CN101364720A CN 101364720 A CN101364720 A CN 101364720A CN A2008100845820 A CNA2008100845820 A CN A2008100845820A CN 200810084582 A CN200810084582 A CN 200810084582A CN 101364720 A CN101364720 A CN 101364720A
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Abstract
The invention discloses a method for deicing a DC line which runs under the double-pole semi-pressure overload in the established DC power transmission system. At present, the DC voltage class is plus or minus 500 kV in the established DC power transmission system in China. When the external insulation level of the line is reduced due to the ice-coated DC line, flashover and other failures occur if the line still runs at a normal voltage for the time being, and finally result in abnormal running of the DC system. Through the appropriate change of the wiring manner inside the valve hall of the established DC power transmission system, and the adoption of DC running voltage of plus or minus 250kV obtained by reducing half of the original DC running voltage, and the possibility of the insulation flashover in the DC system is greatly reduced and the line can run under the overload, so that the method is realized. The method has the advantages that no main device is added, the insulation level of the prior device is not required to improve, and the wiring manner inside the valve hall is only required to appropriately change, therefore the method has higher use value.
Description
Technical field
The present invention relates to the de-icing method of HVDC (High Voltage Direct Current) transmission system DC line, more particularly, the DC line ice-melt of the DC transmission system that this method is particularly useful for having put into operation.This method is not increasing any main equipment, and need not improve under the condition of apparatus insulated level, by the mode of connection in the valve Room is carried out appropriate change, one 6 pulse conversion device of the utmost point one connected with one 6 pulse conversion device of the utmost point two constitute 12 new pulse conversion devices, adopt than original reduce half promptly ± the DC operation voltage of 250kV, when running overload, can provide direct current that direct current icing circuit is carried out ice-melt.
Background technology
China is one of the most serious country of powerline ice-covering in the world.Serious icing can cause transmission line machinery and electric property sharply to descend, thereby causes the generation of icing accident.The powerline ice-covering accident all once took place in provinces such as China Hunan, Hubei, Guizhou, Jiangxi, Yunnan, Sichuan, Henan and Shaanxi.The icing accident serious threat the safe operation of China's electric power system, and cause enormous economic loss.
Traditional manually to step on the tower de-icing method not only dangerous, and efficient is not high, is the remedial measure of doing something against one's will.Will fundamentally improve the anti-ice damage ability of transmission line, must make full use of original DC line and other primary equipments from design and technical starting with, the mode of connection by appropriate change equipment realizes big electric current operation, thus the realization line ice-melting.
For China put into operation ± the 500kV DC transmission system, as Three Gorges-Changzhou, Three Gorges-Shanghai, Three Gorges-Guangzhou, DC transmission engineering such as Ge Zhou Ba-Shanghai, in the winter time during the circuit icing, on the one hand because icing causes the line insulation level to reduce, normally ± the easy flashover that takes place when the 500kV direct voltage moves, for guaranteeing the operation of direct current system, can only take 70% brownout operation mode, but, when direct current system 70% brownout operation, the converter transformer tap is in minimum gear, the unloaded direct voltage of valve side has reached minimum, the angle of converter valve operation is still bigger, if carry out ice-melt to the icing circuit this moment, have only the direct current of increase and be higher than the purpose that rated direct current could be realized ice-melt, but, under the situation of converter valve wide-angle operation, if direct current increases simultaneously, at this moment the stress of converter valve will significantly increase, this situation does not allow to occur, therefore for put into operation at present ± maximum running current is a rated current when having set 70% step-down in the control system of 500kV DC transmission system.
If after revising the mode of connection of having built in the DC engineering utmost point one and the utmost point two valve Rooms, direct current system can be pressed under the situation of operation at ± 250kV half, the converter transformer tap is higher than under the situation of minimum gear operation, rectification side converter valve operation angle is under the situation of 15 degree, by increasing direct current and being higher than rated direct current, be under the situation of running overload, the situation that just can avoid above-mentioned converter valve wide-angle and D.C. high-current to occur simultaneously takes place, and can realize the ice-melt of DC line this moment.The present invention just for realize that this purpose proposes to building the DC line de-icing method of DC engineering.
Summary of the invention
The present invention is by revising the mode of connection of having built in the DC engineering utmost point one and the utmost point two valve Rooms, one 6 pulse conversion device of the utmost point one connected with one 6 pulse conversion device of the utmost point two constitute 12 new pulse conversion devices, neutral earthing at 12 pulse conversion devices of inversion side, constitute the direct current system of one ± 250kV, this system's working voltage is ± 250kV, the new direct current system that makes up can running overload, for DC line provides ice melting current.During the metallic return operation, can carry out ice-melt to the DC power transmission line of icing.
Description of drawings
Fig. 1 has built direct current system main electrical scheme sketch.
Fig. 2 is the direct current system main electrical scheme sketch behind the modification utmost point one and the utmost point two valve Room internal wirings.
Embodiment
For building ± the 500kV DC transmission engineering, constitute by two utmost points respectively for sending and receiving-end system, be called the utmost point one and the utmost point two, as shown in Figure 1, the utmost point one and the utmost point two are in series by two 6 pulse conversion devices respectively, constitute one 12 pulse conversion device, two 6 pulse conversion devices are connected with dihedral (Y/D) converter transformer with star (Y/Y) converter transformer respectively.Under the normal condition, the utmost point one runs on+500kV,, the utmost point two runs on-500kV, and each 6 pulse conversion device is 250kV to the contribution of direct voltage.Under the situation of DC line icing, when line insulation reduces, the utmost point one and the utmost point two can only reduce the rated voltage operation of voltage to 70%, as previously mentioned, reason owing to converter valve stress, this moment, DC line electric current maximum can only be a rated current, and this electric current can not satisfy the requirement to the DC line ice-melt.Therefore, with the disconnection that is connected between two the 6 pulse conversion devices of the utmost point one in sending and the receiving-end system and the utmost point two, and the 6 pulse conversion devices that the utmost point one is connected with star (Y/Y) converter transformer are serially connected with the 6 pulse conversion devices that dihedral (Y/D) converter transformer is connected with the utmost point two, shown in figure two, simultaneously sending is disconnected by opening K switch and earth point, only the mid point with receiving-end system 12 pulse conversion devices inserts earth point G.During improved system specified operation, DC line voltage is ± 250kV, and sending is as the operation of rectification side, and the converter angle can be controlled at 15 degree, and receiving-end system is as the operation of inversion side, and the converter angle can be controlled at 17 degree.Consider the capability of overload of converter, improved direct current system is the highest can be by 1.5 times of running overloads, and this moment, the direct current of this system can reach 4500A, can satisfy the ice melting current requirement behind the DC line icing substantially.
Claims (4)
1, a kind of de-icing method of the HVDC (High Voltage Direct Current) transmission system that put into operation is characterized in that by changing wiring one 6 pulse conversion device of the utmost point one is connected with one 6 pulse conversion device of the utmost point two constitutes 12 new pulse conversion devices.
2, according to claim 1, it is characterized in that: the utmost point one and the utmost point two are that they are respectively the 12 pulse conversion devices that are composed in series by two 6 pulse conversion devices at two utmost points that constitute HVDC (High Voltage Direct Current) transmission system.
3, as described in claim 1 and 2, it is characterized in that: the earth point that the utmost point one and the utmost point are two is positioned at the centre of 12 new pulse conversion devices, i.e. the centre of one 6 pulse conversion device of one of the utmost point one the 6 pulse conversion device and the utmost point two.
4, as described in the claim 1,2,3, it is characterized in that: when adopting the half voltage overload operational mode, can carry out ice-melt DC line for 12 new pulse conversion devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100845820A CN101364720A (en) | 2008-04-09 | 2008-04-09 | DC bipolar half voltage overload ice melting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100845820A CN101364720A (en) | 2008-04-09 | 2008-04-09 | DC bipolar half voltage overload ice melting method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101364720A true CN101364720A (en) | 2009-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100845820A Pending CN101364720A (en) | 2008-04-09 | 2008-04-09 | DC bipolar half voltage overload ice melting method |
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| CN (1) | CN101364720A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882774A (en) * | 2010-03-30 | 2010-11-10 | 南方电网技术研究中心 | DC de-icing device without special rectifier transformer and protection method thereof |
| CN109245567A (en) * | 2018-10-17 | 2019-01-18 | 南方电网科学研究院有限责任公司 | A kind of closed loop control method inhibiting double 12 pulsation, 24 resonance in midpoint |
-
2008
- 2008-04-09 CN CNA2008100845820A patent/CN101364720A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882774A (en) * | 2010-03-30 | 2010-11-10 | 南方电网技术研究中心 | DC de-icing device without special rectifier transformer and protection method thereof |
| CN101882774B (en) * | 2010-03-30 | 2012-09-26 | 南方电网科学研究院有限责任公司 | DC de-icing device without special rectifier transformer and protection method thereof |
| CN109245567A (en) * | 2018-10-17 | 2019-01-18 | 南方电网科学研究院有限责任公司 | A kind of closed loop control method inhibiting double 12 pulsation, 24 resonance in midpoint |
| CN109245567B (en) * | 2018-10-17 | 2020-08-04 | 南方电网科学研究院有限责任公司 | Closed-loop control method for inhibiting 24-time resonance of midpoint of double-twelve-pulse converter |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| DD01 | Delivery of document by public notice |
Addressee: State Grid DC Project Construction Co., Ltd. Document name: Notification that Application Deemed to be Withdrawn |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090211 |