CN105425103A - EHV (extra-high voltage) DC power transmission bipolar line fault restart coordination improving method and system - Google Patents
EHV (extra-high voltage) DC power transmission bipolar line fault restart coordination improving method and system Download PDFInfo
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- CN105425103A CN105425103A CN201510749622.9A CN201510749622A CN105425103A CN 105425103 A CN105425103 A CN 105425103A CN 201510749622 A CN201510749622 A CN 201510749622A CN 105425103 A CN105425103 A CN 105425103A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/063—Details concerning the co-operation of many similar arrangements, e.g. in a network
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- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses an EHV (extra-high voltage) DC power transmission bipolar line fault restart coordination improving method and system. The method comprises the steps: judging electrode and counter electrode DC line faults; widening de-ionization time; considering whether a counter electrode valve group is in an unlocking state or not, and starting a function meeting a condition that the other electrode DC line forbid a restart function in a restart process of one electrode DC line; or carrying out electrode locking when a DC line is in a mode of island operation. The above method and system avoid a risk of double-electrode locking caused by a condition that a fault happens to the other electrode line when the fault restart of one electrode line is successful. The double-electrode locking is carried out when the fault happens to the other electrode in the fault restart process of one electrode line, and requirements for a double-electrode line fault restart coordination function are met.
Description
Technical field
The present invention relates to electric system high-voltage dc transmission electrical domain, particularly relate to a kind of extra-high voltage direct-current transmission bipolar line fault and restart coordination function and improve one's methods and system.
Background technology
DC transmission engineering is made up of converting plant, bipolar DC link, Inverter Station, for improving direct current transportation available rate, adopt the bipolar double converter method of operation, one pole of extra-high voltage direct-current engineering is composed in series by two valve groups, arbitrary valve group is available can ensure that this is extremely available, and pole 1 DC line and pole 2 DC line can independent operatings.
DC line fault is mainly transient fault, transient fault refer to caused by thunder and lightning insulator surface flashover, strong wind lead-in wire the object such as short, birds and branch to fall the electric discharge etc. that branch under the short circuit and line that cause on the line causes over the ground, this type of transient fault is also restarted realize Failure elimination by being performed fault, avoid direct current locking, but can impact network system in DC line fault restarting process.
In high power DC engineering, for avoiding unordered line fault to restart impact to system, can arrange bipolar line fault in DC bipolar and restart coordination function, this function all configures in pole 1 DC line and pole 2 DC line control system.This function mainly comprises " in a pole restarting process, another pole forbids restarting function " and " after a pole locking in 15 minutes, another pole forbids restarting function ".
" in a pole restarting process, another pole forbids restarting function " needs operations staff manually to drop into or automatically drops under island mode, and so-called island mode is that converting plant is only connected with generating plant, is separated the grid mode of independent operating with AC network.At present in the extra-high voltage direct-current engineering run, this function logic existing defects, when bipolar generation line fault the time interval within a certain period of time, a pole can be there is restart successfully, another pole line fault causes the situation of bipolar equal locking, namely there is unnecessary bipolar locking, then large losses transmission power, larger impact is caused to electrical network.
Summary of the invention
The object of the invention is to for above-mentioned problems of the prior art, propose a kind of at DC protection system, the detection method of the abnormal hidden danger of DC current measurement can be reflected early.
For reaching the object of foregoing invention, the present invention is achieved through the following technical solutions:
A kind of extra-high voltage direct-current transmission bipolar line fault is restarted coordination function and is improved one's methods, and a DC line in pole 1 DC line and pole 2 DC line is as this pole DC line, then another DC line is to pole DC line, then comprise the steps:
Step S10, if this pole DC line breaks down, then produces Fisrt fault signal, to this signal broadening T time, and sends to control module;
Step S20, if break down to pole DC line, then produces the second fault-signal, to this signal broadening T time, and sends to control module; ;
Step S30, judges whether be in released state to the valve group of pole DC line, if any one valve group is in released state, then will send the 3rd fault-signal to control module;
Step S40, if the function of " in a pole DC line restarting process, another pole DC line forbids restarting function " is opened, or under DC line is in decoupled mode, then sends the 4th fault-signal to control module;
Step S50, if control module receives the fault-signal of step S10 to step S40 simultaneously, then exports this pole locking request command, otherwise then continues the operation of parallel execution of steps S10 to step S40.
Further, described control module adopt four inputs with door, only when to receive four incoming level signals simultaneously, control module produces an outputs level signals.
The broadening T time of described step S10 and S20, for keeping the constant T time of Fisrt fault signal level, and continues to flow to control module.
The above T time be faulty equipment go the free time.
A kind of extra-high voltage direct-current transmission bipolar line fault of the present invention is restarted coordination function and is improved one's methods, the logic flaw that existing extra-high voltage direct-current bipolar line fault restarts coordination function can be improved, avoid a pole line fault to restart successfully, another pole line failure can cause the risk of bipolar locking; Simultaneously in a pole line fault restarting process, another pole line failure then performs bipolar locking.
A kind of extra-high voltage direct-current transmission bipolar line fault restarts coordination function improved system, a DC line in pole 1 DC line and pole 2 DC line is as this pole DC line, then another DC line is to pole DC line, what include that four inputs one export inputs first or the door exported, this pole broadening module and to pole broadening module with door, two, described pole broadening module receives this pole DC line fault signal, and this pole DC line fault signal after Xiang Yumen output broadening; Pole broadening module is received pole DC line fault signal, and Xiang Yumen export after broadening to pole DC line fault signal; The signal extremely arbitrary valve group being in released state is also received with door; First or door receive another pole in a pole restarting process and forbid restarting the status signal that the enable signal of function and DC line are in decoupled mode, first or Men Xiangyu door output signal, export this pole DC line locking command request signal with door.
Described pole broadening module and all adopt MFP pulse producer as broadening module to pole broadening module.
Further, also include second or door, second or door be input to the status signal of each valve group of pole, second or the output signal of door be the signal extremely arbitrary valve being in released state.
The status signal of described valve group is 1, represents that valve group is in released state.
Described pole DC line fault signal is 1, then represent this pole DC line fault.
Described is 1 to pole DC line fault signal, then represent pole DC line fault.
The enable signal of described " in a pole restarting process, another pole forbids restarting function " is 1, represent that in the DC line restarting process of pole 1, pole 2 DC line forbids that restarting function opens, or in the DC line restarting process of pole 2, pole 1 DC line forbids that restarting function opens.
The status signal that described DC line is in decoupled mode is 1, represents that DC line is in decoupled mode.
Compared to existing technology, a kind of extra-high voltage direct-current transmission bipolar line fault of the present invention is restarted coordination function and is improved one's methods and system, and the beneficial effect brought has:
1, solve in original function, a pole line fault can occur and restart successfully, another pole line failure can cause the problem of bipolar locking;
2, need not change increase hardware configuration, engineering availability is strong;
3, add " released state is in extremely arbitrary valve group " decision content, ensure that the reliability that function can not activate by mistake under monopole operating mode.
Accompanying drawing explanation
Fig. 1 is the electrical structure schematic diagram of extra-high voltage direct-current transmission bipolar line.
Fig. 2 is the flow chart of steps that extra-high voltage direct-current transmission bipolar line fault of the present invention is restarted coordination function and improved one's methods.
Fig. 3 is the logic gate schematic diagram that extra-high voltage direct-current transmission bipolar line fault of the present invention restarts coordination function improved system.
Fig. 4 is the structural representation of MFP pulse producer.
Fig. 5 is the logical schematic of MFP pulse producer.
Embodiment
Be clearly and completely described the technical scheme in the embodiment of the present invention below in conjunction with drawings and Examples, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.
Referring to Fig. 1, is the electrical structure schematic diagram of extra-high voltage direct-current transmission bipolar line.In extra high voltage direct current transmission line, adopt the bipolar line of two 12 pulse conversion device series wiring modes of extra-high voltage direct-current pole 1 circuit and extra-high voltage direct-current pole 2 circuit, be abbreviated as pole 1 DC line and pole 2 DC line hereinafter, both sides between pole 1 DC line and pole 2 DC line are respectively converting plant and Inverter Station, converting plant is substantially identical with the main junction box equipment of Inverter Station, includes transverter, converter power transformer, valve group, by-pass switch, by-pass knife switch and DC filter.
As Fig. 2 for shown in, the extra-high voltage direct-current transmission bipolar line fault of the embodiment of the present invention is restarted coordination function and is improved one's methods, a DC line in pole 1 DC line and pole 2 DC line is as this pole DC line, then another DC line is to pole DC line, then comprise the steps:
Step S10, if this pole DC line breaks down, then produces Fisrt fault signal, to this signal broadening T time, and sends to control module (not shown);
Step S20, if break down to pole DC line, then produces the second fault-signal, to this signal broadening T time, and sends to control module; ;
Step S30, judges whether be in released state to the valve group of pole DC line, if any one valve group is in released state, then will send the 3rd fault-signal to control module;
Step S40, if the function of " in a pole DC line restarting process, another pole DC line forbids restarting function " is opened, or under DC line is in decoupled mode, then send the 4th fault-signal to control module, described " in a pole DC line restarting process, another pole DC line forbids restarting function " is that the bipolar line fault in existing fault restarting equipment restarts coordination function, in this step, " in a pole DC line restarting process, another pole DC line forbids restarting function " initiatively drop into enable signal by operations staff;
Step S50, if control module receives the fault-signal of step S10 to step S40 simultaneously, then export this pole locking request command, otherwise then continue the operation of parallel execution of steps S10 to step S40, described pole locking order, refer to that straight-wavy valve Ore-controlling Role no longer sends out trigger pulse to converter valve, converter valve turns off, and no longer includes electric current and flows through.
Further, as an embodiment, described control module adopt four inputs with door 101, only when to receive four incoming level signals simultaneously, control module produces an outputs level signals.
On the basis of above-described embodiment, the broadening T time of described step S10 and S20, for keeping the constant T time of Fisrt fault signal level, and continues to flow to control module.
The above T time be faulty equipment go the free time.
Further, as an embodiment, described T time be faulty equipment go the free time.。
As Fig. 3 for shown in, extra-high voltage direct-current transmission bipolar line fault of the present invention restarts coordination function improved system, a DC line in pole 1 DC line and pole 2 DC line is as this pole DC line, then another DC line is to pole DC line, then its concrete logical organization is as described below:
What include that four inputs one export inputs first or the door 102 exported, this pole broadening module 103 and to pole broadening module 104 with door 101, two, described pole broadening module 103 receives this pole DC line fault signal, and exports this pole DC line fault signal after broadening to door 101; Pole broadening module 104 is received pole DC line fault signal, and to door 101 export after broadening to pole DC line fault signal; The signal extremely arbitrary valve group being in released state is also received with door 101; First or door 102 receive the status signal that the enable signal of " in a pole restarting process, another pole forbids restarting function " and DC line are in decoupled mode, first or door 102 output signal to door 101, export this pole DC line locking command request signal with door 101.
As shown in Figure 4, described pole broadening module 103 and all adopt MFP pulse producer as broadening module to pole broadening module 104, described MFP pulse producer has the pulse of fixed width in order to produce, its logic function is as shown in Figure 5: status signal is through MFP pulse producer broadening T time, namely this status signal remained for 1 pressure duration is T, after T time, this signal becomes 0.MFP pulse producer receive preset T time as the duration of pulse, this pole DC line fault signal or to pole DC line fault signal as input pulse, time broadening T preferably goes the free time in the present embodiment.
Further, also include second or door (not shown), second or door be input to the status signal of each valve group of pole, second or the output signal of door be the signal extremely arbitrary valve being in released state.
The status signal of described valve group is 1, represents that valve group is in released state.
Described pole DC line fault signal is 1, then represent this pole DC line fault.
Described is 1 to pole DC line fault signal, then represent pole DC line fault.
The enable signal of described " in a pole restarting process, another pole forbids restarting function " is 1, represent that in the DC line restarting process of pole 1, pole 2 DC line forbids that restarting function opens, or in the DC line restarting process of pole 2, pole 1 DC line forbids that restarting function opens.
The status signal that described DC line is in decoupled mode is 1, represents that DC line is in decoupled mode.
Above-described embodiment only in order to the present invention is described and and unrestricted technical scheme described in the invention; Therefore, although this instructions with reference to each above-mentioned embodiment to present invention has been detailed description, those of ordinary skill in the art should be appreciated that and still can modify to the present invention or equivalent to replace; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (10)
1. an extra-high voltage direct-current transmission bipolar line fault is restarted coordination function and is improved one's methods, it is characterized in that, a DC line in pole 1 DC line and pole 2 DC line is as this pole DC line, then another DC line is to pole DC line, then comprise the steps:
Step S10, if this pole DC line breaks down, then produces Fisrt fault signal, and to this signal broadening T time, and send to control module;
Step S20, if break down to pole DC line, then produces the second fault-signal, and to this signal broadening T time, and send to control module;
Step S30, judges whether be in released state to the valve group of pole DC line, if any one valve group is in released state, then will send the 3rd fault-signal to control module;
Step S40, if the function of " in a pole DC line restarting process, another pole DC line forbids restarting function " is opened, or under DC line is in decoupled mode, then sends the 4th fault-signal to control module;
Step S50, if control module receives the fault-signal of step S10 to step S40 simultaneously, then exports this pole locking request command, otherwise then continues the operation of parallel execution of steps S10 to step S40.
2. extra-high voltage direct-current transmission bipolar line fault according to claim 1 is restarted coordination function and is improved one's methods, it is characterized in that, described control module adopt four inputs with door (101), only when to receive four incoming level signals simultaneously, control module produces an outputs level signals.
3. extra-high voltage direct-current transmission bipolar line fault according to claim 2 is restarted coordination function and is improved one's methods, it is characterized in that, the broadening T time of described step S10 and S20, for keeping the constant T time of Fisrt fault signal level, and continues to flow to control module.
4. the extra-high voltage direct-current transmission bipolar line fault according to claim 1 or 3 is restarted coordination function and is improved one's methods, and it is characterized in that, described T time be DC line fault go the free time.
5. an extra-high voltage direct-current transmission bipolar line fault restarts coordination function improved system, a DC line in pole 1 DC line and pole 2 DC line is as this pole DC line, then another DC line is to pole DC line, it is characterized in that, include four inputs one export with door (101), first or door (102) that two inputs one export, this pole broadening module (103) and to pole broadening module (104), described pole broadening module (103) receives this pole DC line fault signal, and export this pole DC line fault signal after broadening to door (101), to pole broadening module (104) receive to pole DC line fault signal, and to door (101) export after broadening to pole DC line fault signal, the signal extremely arbitrary valve group being in released state is also received with door (101), first or door (102) receive another pole in a pole restarting process and forbid restarting the status signal that the enable signal of function and DC line are in decoupled mode, first or door (102) Xiang Yumen (101) output signal, export this pole DC line locking command request signal with door (101).
6. extra-high voltage direct-current transmission bipolar line fault according to claim 5 restarts coordination function improved system, it is characterized in that, described pole broadening module (103) and all adopt MFP pulse producer as broadening module to pole broadening module (104).
7. extra-high voltage direct-current transmission bipolar line fault according to claim 5 restarts coordination function improved system, it is characterized in that, also include second or door, second or door are input to the status signal of each valve group of pole, second or the output signal of door be the signal extremely arbitrary valve being in released state.
8. extra-high voltage direct-current transmission bipolar line fault according to claim 7 restarts coordination function improved system, it is characterized in that, the status signal of described valve group is 1, represents that valve group is in released state.
9. extra-high voltage direct-current transmission bipolar line fault according to claim 5 restarts coordination function improved system, it is characterized in that, described pole DC line fault signal is 1, then represent this pole DC line fault, described is 1 to pole DC line fault signal, then represent pole DC line fault.
10. extra-high voltage direct-current transmission bipolar line fault according to claim 5 restarts coordination function improved system, it is characterized in that, the enable signal of described " in a pole restarting process, another pole forbids restarting function " is 1, represent that in the DC line restarting process of pole 1, pole 2 DC line forbids that restarting function opens, or pole 1 DC line forbids that restarting function opens in the DC line restarting process of pole 2, the status signal that described DC line is in decoupled mode is 1, represents that DC line is in decoupled mode.
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Cited By (3)
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| CN105977953A (en) * | 2016-05-05 | 2016-09-28 | 南方电网科学研究院有限责任公司 | Control method and system for DC line restart function |
| CN107086560A (en) * | 2017-06-23 | 2017-08-22 | 南方电网科学研究院有限责任公司 | The method of locking direct current, system and direct current station control cabinet under a kind of isolated island low-power |
| CN110571766A (en) * | 2019-07-23 | 2019-12-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current line fault restarting method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107086560A (en) * | 2017-06-23 | 2017-08-22 | 南方电网科学研究院有限责任公司 | The method of locking direct current, system and direct current station control cabinet under a kind of isolated island low-power |
| CN107086560B (en) * | 2017-06-23 | 2023-05-16 | 南方电网科学研究院有限责任公司 | Method and system for locking direct current under island low power and direct current station control cabinet |
| CN110571766A (en) * | 2019-07-23 | 2019-12-13 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current line fault restarting method |
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