CN103762543A - Extra-high voltage DC protection voltage reference value automatic switchover implementation method - Google Patents
Extra-high voltage DC protection voltage reference value automatic switchover implementation method Download PDFInfo
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- CN103762543A CN103762543A CN201410034801.XA CN201410034801A CN103762543A CN 103762543 A CN103762543 A CN 103762543A CN 201410034801 A CN201410034801 A CN 201410034801A CN 103762543 A CN103762543 A CN 103762543A
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Abstract
The invention discloses an extra-high voltage DC protection voltage reference value automatic switchover implementation method. The running states of a valve set of a control system and running modes of the system are received in real time, and when only one series-connection set runs, a DC protection voltage reference value is half of a system rated DC voltage; when a system double-series-connection valve set runs, the running modes of the system are judged continuously, and when the system runs in a full voltage mode, the DC protection voltage reference value is the system rated DC voltage; when the system runs in a step-down mode, the DC protection voltage reference value is obtained through a step-down reference value multiplied by the system rated DC voltage. According to the switchover method, the extra-high voltage DC protection voltage reference value can be switched automatically according to the running modes of an extra-high voltage DC system.
Description
Technical field
The present invention relates to a kind of method of extra-high voltage direct-current transmission protection voltage reference value automatic switchover of series valve group.
Background technology
Extra-high voltage direct-current is that from the different of conventional direct current maximum ultra high voltage has adopted a major loop of two 12 flutter valve group series connection, and each 12 flutter valve group all can independent operating.When one of them 12 flutter valve group breaks down, by the operation to primary equipments such as bypass cock, bypass disconnecting links, realize the isolation of defective valves group, as much as possible utilize the redundancy of primary equipment, minimizing equipment the brought power loss that goes wrong.In order to coordinate the mode of connection of primary equipment; the design of extra-high voltage direct-current control protection must meet the requirement of various operational modes; the operations such as valve group drops into online in order to realize, isolation, step-down; the definite value of direct current protecting must be according to the system operation mode definite value that automatically switches, and this case produces based on this kind of demand just.
Summary of the invention
Object of the present invention, is to provide a kind of extra-high voltage direct-current to protect the implementation method of voltage reference value automatic switchover, and it can be according to the operational mode of extra-high voltage direct-current system, automatic switchover extra-high voltage direct-current protection voltage reference value.
In order to reach above-mentioned purpose, solution of the present invention is:
The implementation method that extra-high voltage direct-current protection voltage reference value automatically switches, comprises the steps:
(1) the valve group running status of real-time receiving control system and the operational mode of system, when system only has a series valve group operation, direct current protecting voltage reference value is the half of system rated direct voltage; When system two-in-series valve group is moved, go to step (2);
(2) operational mode of continuation judgement system, when system operates in total head mode, direct current protecting voltage reference value is system rated direct voltage; When system operates in step-down mode, direct current protecting voltage reference value is that step-down reference value is multiplied by system rated direct voltage.
The above-mentioned protection that relates to voltage reference value switching comprises DC minimum voltage protection, DC overvoltage protection, DC line traveling-wave protection and the protection of DC line voltage jump amount.
In above-mentioned steps (2), the span of step-down reference value is 0.5～1.0.
Adopt after such scheme; the relevant protection definite value of the direct voltages such as DC minimum voltage protection, DC overvoltage protection, DC line traveling-wave protection, the protection of DC line voltage jump amount is according to the operational mode automatic switchover definite value of system; without stoppage in transit direct current or manual switchover definite value, adapt to the changeable operational mode of extra-high voltage direct-current.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is the position view of direct voltage UDL in the present invention.
Embodiment
The invention provides the implementation method that a kind of extra-high voltage direct-current protection voltage reference value automatically switches; the protection that the voltage reference value relating to switches comprises DC minimum voltage protection, DC overvoltage protection, DC line traveling-wave protection and the protection of DC line voltage jump amount; below with reference to accompanying drawing; take DC line voltage jump amount, protect as example, technical scheme of the present invention is elaborated.
As shown in Figure 2, the principle of DC line voltage jump amount protection is:
DUDL/dt<k1*UD_ref and
｜UDL｜<k2*UD_ref
Wherein, dUDL/dt is DC voltage change amount, and UDL is the direct voltage that utmost point bus measures, and k1, k2 are proportionality coefficient, and the span of k1 is-2.0～-0.5, and the span of k2 is that 0.2～0.7, UD_ref is direct voltage reference value.
In conjunction with Fig. 1, the switching of the direct voltage reference value UD_ref in DC line voltage jump amount protection definite value comprises the steps:
(1) the valve group running status of real-time receiving control system and the operational mode of system;
(2) when the valve group running status in step (1) is bivalve group operation, and system is while operating in total head mode, and UD_ref is system rated direct voltage.The definite value of now DC line voltage jump amount protection is k1 and k2 is multiplied by system rated direct voltage;
(3) when the valve group running status in step (1) is bivalve group operation, and system is while operating in step-down mode, and UD_ref is that step-down reference value is multiplied by system rated direct voltage, and wherein, the span of step-down reference value is 0.5～1.0.The definite value of now DC line voltage jump amount protection is k1 and k2 and is multiplied by the product of step-down reference value and system rated direct voltage;
(4) when system is when (as valve unit protection action) need exit a valve group for a certain reason, when valve group exits, UD_ref becomes the half of system rated direct voltage automatically.The definite value of now DC line voltage jump amount protection is k1 and k2 and is multiplied by the half of system rated direct voltage.
In above-mentioned steps (4), when carrying out the automatic switchover of DC overvoltage protection, without direct current system, stop transport or manually carry out definite value switching.
Above embodiment only, for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought proposing according to the present invention, and any change of doing on technical scheme basis, within all falling into protection range of the present invention.
Claims (3)
1. the implementation method that extra-high voltage direct-current protection voltage reference value automatically switches, is characterized in that comprising the steps:
(1) the valve group running status of real-time receiving control system and the operational mode of system, when system only has a series valve group operation, direct current protecting voltage reference value is the half of system rated direct voltage; When system two-in-series valve group is moved, go to step (2);
(2) operational mode of continuation judgement system, when system operates in total head mode, direct current protecting voltage reference value is system rated direct voltage; When system operates in step-down mode, direct current protecting voltage reference value is that step-down reference value is multiplied by system rated direct voltage.
2. the implementation method that a kind of extra-high voltage direct-current protection voltage reference value as claimed in claim 1 automatically switches, is characterized in that: the protection that relates to voltage reference value switching comprises DC minimum voltage protection, DC overvoltage protection, DC line traveling-wave protection and the protection of DC line voltage jump amount.
3. the implementation method that a kind of extra-high voltage direct-current protection voltage reference value as claimed in claim 1 automatically switches, is characterized in that: in described step (2), the span of step-down reference value is 0.5～1.0.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410034801.XA CN103762543A (en) | 2014-01-24 | 2014-01-24 | Extra-high voltage DC protection voltage reference value automatic switchover implementation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410034801.XA CN103762543A (en) | 2014-01-24 | 2014-01-24 | Extra-high voltage DC protection voltage reference value automatic switchover implementation method |
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| CN103762543A true CN103762543A (en) | 2014-04-30 |
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| CN201410034801.XA Pending CN103762543A (en) | 2014-01-24 | 2014-01-24 | Extra-high voltage DC protection voltage reference value automatic switchover implementation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538941B (en) * | 2014-12-16 | 2018-01-09 | 国家电网公司 | A kind of HVDC transmission line traveling-wave protection fixed value adjusting method |
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|---|---|---|---|---|
| CN101242132A (en) * | 2007-12-05 | 2008-08-13 | 国网直流工程建设有限公司 | Trigger angle control policy for ultra-high voltage DC startup |
| CN101383506A (en) * | 2008-10-17 | 2009-03-11 | 南方电网技术研究中心 | Method for configuration protection of extra-high voltage DC power transmission system |
| CN101383509A (en) * | 2008-10-17 | 2009-03-11 | 南方电网技术研究中心 | Extra-high voltage DC power transmission control system configuring method |
| CN101719666A (en) * | 2008-10-09 | 2010-06-02 | 许继电气股份有限公司 | Ultra-high voltage DC series valve bank on-off control method |
| CN103441487A (en) * | 2013-08-05 | 2013-12-11 | 国家电网公司 | Method for making high-voltage side group valve put into operation and go out of operation |
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2014
- 2014-01-24 CN CN201410034801.XA patent/CN103762543A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242132A (en) * | 2007-12-05 | 2008-08-13 | 国网直流工程建设有限公司 | Trigger angle control policy for ultra-high voltage DC startup |
| CN101719666A (en) * | 2008-10-09 | 2010-06-02 | 许继电气股份有限公司 | Ultra-high voltage DC series valve bank on-off control method |
| CN101383506A (en) * | 2008-10-17 | 2009-03-11 | 南方电网技术研究中心 | Method for configuration protection of extra-high voltage DC power transmission system |
| CN101383509A (en) * | 2008-10-17 | 2009-03-11 | 南方电网技术研究中心 | Extra-high voltage DC power transmission control system configuring method |
| CN103441487A (en) * | 2013-08-05 | 2013-12-11 | 国家电网公司 | Method for making high-voltage side group valve put into operation and go out of operation |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538941B (en) * | 2014-12-16 | 2018-01-09 | 国家电网公司 | A kind of HVDC transmission line traveling-wave protection fixed value adjusting method |
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Application publication date: 20140430 |