CN104242292B - Control protection processing method for direct current engineering operation in grounding electrode-free mode - Google Patents
Control protection processing method for direct current engineering operation in grounding electrode-free mode Download PDFInfo
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Abstract
A control protection processing method for direct current engineering operation in a grounding electrode-free mode carries out control protection by matching a direct current station control system, a direct current pole control system and a direct current protection system; the direct-current station control system sets the interlocking condition of the grounding switch in the station to be forcibly met; the direct current station control system sets the judgment condition of the connection state of the grounding electrode as that the incidence relation between the rectification station and the branch state of the grounding switch in the station is cancelled, and the condition for judging the branch state of the grounding switch in the rectification station is forcibly met in the inverter station; the direct current pole control system is provided with a bipolar synchronous unlocking/locking unit, a bipolar current following unit and a bipolar combined tripping unit. The invention solves the problem of maintaining the balanced operation of the two poles when the grounding grid in the station is used as the grounding pole in the direct current engineering, is scientific and effective and can meet the requirements of engineering application.
Description
Technical field
The present invention relates to technical field of power systems, the control run particularly to a kind of DC engineering no ground pole mode
Protection processing method.
Background technology
Earthing pole is the important component part of customary DC engineering, not only acts as the effect clamping down on DC point current potential,
Also provide the path returned using the earth as electric current, if therefore for direct current monopolar ground circuit operation mode, bipolar two-terminal-grounding mode
There is no earthing pole, although direct current can clamp down on DC point current potential by grounded screen in station, can not be with the earth as electric current
Return path, if therefore DC bipolar occurs one pole locking when running, then DC current will not have commutating circuit to cause bipolar
Locking.Direct current will be generally not capable of bipolar operation, and can only run in monopolar metallic return mode, and this will cause direct current conveying capacity
Reduce half, largely effect on the availability of DC engineering.
In Practical Project because a variety of causes can exist cannot in time or cannot build up the situation of earthing pole, it is necessary to
Rectification side use station in grounded screen temporarily as earthing pole with keep DC bipolar balance movement with improve general emigrant's direct current power transmission
Ability.But, under existing technical conditions, when rectification side uses grounded screen as earth point, due to ground grid design principle
It is different from earthing pole, it is impossible to for the one pole the earth method of operation.Additionally, be to reduce earth current and duration as much as possible,
Must make the unblocking of the two poles of the earth, emergency outage completed within the shortest time；Simultaneously take account of earth current to ground connection
The galvano-cautery of net, it is necessary to use cathode protection method that grounded screen is protected, and prior art the most all cannot meet above-mentioned wanting
Ask.
Therefore, not enough for prior art, it is provided that a kind of to be applicable at the control that DC engineering no ground pole mode is run
Reason method is to overcome prior art deficiency the most necessary.
Summary of the invention
For overcoming the deficiencies in the prior art, the present invention provides the control that mode the is run protection of a kind of DC engineering no ground pole
Processing method, it is possible to solve to keep when DC engineering uses the interior grounded screen in station temporarily as earthing pole the difficulty of bipolar balance movement
Topic.
The above-mentioned purpose of the present invention is realized by following technology technical scheme:
Control that mode is run protection processing method in a kind of DC engineering no ground pole is provided, by direct current station Ore-controlling Role,
DC pole control system and DC protection system entirety are controlled protection；
Earthed switch chain condition in station is set to meet by force by described direct current station Ore-controlling Role, enables order unit right
In described station, earthed switch carries out point, closes order and control；
The earthing pole connection status Rule of judgment of described direct current station Ore-controlling Role is set to: directly pass through converting plant in converting plant
Individually judge, cancel and the incidence relation of earthed switch point state in station, ground connection in Inverter Station will be used for judging converting plant station
The conditional force of switch point state meets；
Described DC pole control system is provided with bipolar synchronization solution/locking unit, bipolar current follows unit and bipolar jumping
Unit, bipolar synchronization solution/locking unit use synchronize solution/locking processing mode carry out solving/locking order performs process, bipolar electric
Stream is followed unit and is used bipolar current to follow processing mode to carry out earth current control, and bipolar jumping unit uses at bipolar jumping
Reason carries out bipolar locking process；
Described DC protection system carries out ground protection.
Preferably, above-mentioned bipolar synchronization solution/locking unit is provided with first selector and second selector, order unit
Output is connected with input, the input of pole two pole control system of pole one pole control system respectively；
The output of described pole one pole control system is connected with the input of described first selector, and described first selector sets
It is equipped with the first output and the second output, the first output of first selector and the first input end of pole one valve group controller
Connect, the second output of first selector with station Ore-controlling Role first input end be connected, the first output of Ore-controlling Role of standing and
The feedback input end of described pole one pole control system connects, the feedback output end of described pole one pole control system and the valve group control of described pole one
The feedback input end of device processed connects, and described pole one valve group controller includes the low valve control of the high valve control in pole one and pole one, institute
The high end valve group stating the high valve control in pole one and pole one is bi-directionally connected, and the low valve control in described pole one is double with the low end valve group of pole one
To connection；
The output of described pole two pole control system is connected with the input of described second selector, and described second selector sets
Being equipped with the first output and the second output, the first output of second selector connects with the input of pole two valve group controller
Connecing, the second output of second selector is connected with the second input of station Ore-controlling Role, the second output of Ore-controlling Role of standing and institute
The feedback input end stating pole two pole control system connects, and the feedback output end of described pole two pole control system controls with described pole two valve group
The feedback input end of device connects, and described pole two valve group controller includes the low valve control of the high valve control in pole two and pole two, described
The high valve control in pole two is bi-directionally connected with the high end valve group of pole two, and the low valve control in described pole two is two-way with the low end valve group of pole two
Connect；
Described first selector is identical with described second selector, all with the mode of connection control word of DC fields for judging bar
Part；
When DC fields is in monopolar metallic return configuration mode, mode of connection control word is 0, the first of first selector
Output turns on, the first output conducting of second selector；The wiring when DC fields is in bipolar Ground return configuration mode
Mode control word is 1, the second output conducting of first selector, the second output conducting of second selector；
Described bipolar synchronization solution/locking unit carries out bipolar synchronization solution/locking and processes specifically:
Order unit issues solution/locking order to corresponding pole one pole control system, pole two pole control system, first selector,
Second selector selects signal output channels according to mode of connection control word；
When mode of connection control word is 0, the first output of first selector conducting first selector is by order unit
The solution issued/locking order input extremely one valve group controller, the first output of second selector conducting second selector will
The solution that order unit issues/locking order input extremely two valve group controllers, are i.e. controlled the height of pole one by the high valve control in pole one
End valve group, the low end valve group respectively correspondence being controlled pole one by pole one low end valve group controller perform solution/block action, high by pole two
Valve control controls the high end valve group of pole two, is controlled the low end valve group correspondence execution respectively of pole two by pole two low end valve group controller
Solution/block action；
When mode of connection control word is 1, first selector conducting the second output of first selector, second selector
Order unit is issued to bipolar solution/locking order input to station control system by the second output of conducting second selector respectively
System, Ore-controlling Role of standing carries out station control and operates to arrive at a station control signal received bipolar solution/locking order, and the feedback of Ore-controlling Role of standing is defeated
Go out end and station control signal synchronization corresponding feedback respectively is beamed back pole one pole control system, pole two pole control system, then by pole one pole control system
Feedback signal is issued pole one valve group controller by feedback input end, by pole two pole control system, feedback signal is defeated by feedback
Enter end and issue pole two valve group controller, controlled the high end valve group of pole one by the high valve control in pole one, controlled by pole one low end valve group
Device controls the low end valve group correspondence respectively of pole one and performs solution/block action, the high valve control in pole two control the high end valve of pole two
Group, the low end valve group respectively correspondence being controlled pole two by pole two low end valve group controller perform solution/block action.
Above-mentioned station Ore-controlling Role carries out station control and operates to arrive at a station control signal received bipolar solution/locking order, specifically leads to
Cross following manner to carry out:
Unlock a valve group signal when receiving from pole one pole control system and unlock two valve group signals, from pole two pole control system
When receiving one valve group signal of unblock and unlock two valve group signals, proceed as follows: will be received from pole one pole control system
One valve group signal of unblock and unlock two valve group signals and carry out logic or operation obtains pole one or processes signal；Will be from pole two
One valve group signal of the unblock that pole control system is received or two valve group signals of unblock carry out logic or operation obtains pole two or place
Reason signal；Described pole one or process signal are carried out logical AND operation with described pole two or process signal and controls signal simultaneously as station
Feedback beams back pole one pole control system and pole two pole control system respectively；
When receiving one valve group signal of locking or two valve group signals of locking from pole one pole control system, from pole two pole control system
When receiving one valve group signal of locking or two valve group signals of locking, proceed as follows: will be received from pole one pole control system
One valve group signal of locking and two valve group signals of locking carry out logic or operation obtains pole one or processes signal；Will be from pole two
One valve group signal of the locking that pole control system is received and two valve group signals of locking carry out logic or operation obtains pole two or place
Reason signal；Described pole one or process signal are carried out logic or operation with described pole two or process signal and controls signal simultaneously as station
Corresponding feedback beams back pole one pole control system and pole two pole control system.
Mentioned order unit is set to man-machine interface, and the solution that man-machine interface issues/locking order is transmitted respectively by LAN net
Extremely one pole control system and pole two pole control system, carry out signal friendship by control bus between pole one pole control system and station Ore-controlling Role
Transmission mutually, carries out signal alternating transmission by control bus between pole two pole control system and station Ore-controlling Role.
Above-mentioned bipolar current is followed processing unit and is provided with bipolar released state R-S latch,
The high end valve group arranging pole one and the firing pulse enable signal of low end valve group carry out logic or operation obtains pole
One igniting pulsed logic or signal, the high end valve group arranging pole two and the firing pulse of low end valve group enable signal and carry out logic
Or operation obtains pole two firing pulse logic or signal, then is lighted a fire in pole one pulsed logic or signal and pole two firing pulse logic
Or signal carries out logical AND operation, as " S " signal of R-S latch, when bipolar released state signal is 0, represent one pole
Metallic return unlocks, and when bipolar released state signal is 1, represents that bipolar Ground return unlocks；
Described bipolar current is followed process and is realized especially by following manner:
Read the bipolar released state signal of R-S latch output,
When bipolar released state signal is 0, pass using the current-order calculated value of this pole as final current reference value
Deliver to valve group controller；
When bipolar released state signal is 1, process according to following concrete condition:
1) calculate absolute difference, specifically receive current reference value to pole, do with the current-order calculated value of this pole
Difference, and difference is taken absolute value；
2) absolute difference is compared with current reference value regulation dead band,
When absolute value is not more than regulation dead band, pass using the current-order calculated value of this pole as final current reference value
Deliver to valve group controller；
When absolute value is more than regulation dead band, receives current reference value to pole, compare with the current reference value of this pole
Relatively and take little, using little current reference value as smaller value；When this pole is pole a period of time, using above-mentioned smaller value as final electric current
Reference value is sent to valve group controller；When this pole is pole two, and when occurring current reference value to follow, deduct with above-mentioned smaller value
Result after 15A is sent to valve group controller as final current reference value.
Preferably, current reference value regulation the dead time is 50A.
Above-mentioned bipolar jumping unit carries out bipolar jumping and processes specifically:
Pole, this pole is controlled by pole one pole control system, pole two pole control system respectively, pole is protected, group is controlled, organize protection and outside is jumped
Lock signal carries out logic or operation, respectively obtains the emergency outage signal of this pole under bipolar released state；
The emergency outage signal of this pole is sent to station respectively by pole one pole control system, pole two pole control system by controlling bus
Ore-controlling Role；
Ore-controlling Role of standing carries out logic or operation to the emergency outage signal of received pole one, the emergency outage signal of pole two
Obtaining or operate emergency outage signal, rectification side or will operate emergency outage signal and sends extremely one pole control system by controlling bus
System and pole two pole control system, pole one pole control system, pole two are controlled electrode systems and respectively emergency outage signal are sent extremely one valve group control
Device processed, pole two valve group controller perform emergency outage action, and inverter side sends extremely one pole with block signal by controlling bus
Ore-controlling Role and pole two pole control system, pole one pole control system, pole two are controlled electrode systems and respectively block signal are sent extremely one valve group control
Device processed, pole two valve group controller perform block action.
The ground protection of above-mentioned DC protection system is specifically:
In rectification side station, grounded screen overcurrent protection 76SG 1 section is set to the request of bipolar balance movement, and its definite value is
0.01p.u.；
Rectification side is provided with grounded screen overcurrent protection 76SG 4 sections in station, and definite value is 0.3p.u., time delay 350ms；
In rectification side station, earthed system protection 1 section of time delay of 87GSP is 2s；
Rectification side is provided with earthed system protection 87GSP 2 sections in station, definite value 0.3p.u., time delay 500ms；
2 sections of definite values of ground electrode circuit overload protection 76EL of inverter side are 0.15p.u., time delay 750ms.
The ground protection of above-mentioned DC protection system also includes, the grounding electrode electric current unbalance protection unit of locking rectification side
With earthing pole over-current protecting unit.
The ground protection of above-mentioned DC protection system also includes, under conditions of the no ground pole of rectification side is run, by ground connection
Two Measurement channel fault-signal shieldings of electrode current IDEE1 and IDEE2.
The control protection processing method that a kind of DC engineering no ground pole mode of the present invention is run, by direct current station control system
System, DC pole control system and DC protection system cooperation are controlled protection；Described direct current station Ore-controlling Role is by interior for station earthed switch
Chain condition is set to meet by force, enables order unit to carry out earthed switch in described station point, closes order and control；Described
In the Ore-controlling Role of direct current station, earthing pole connection status is individually judged by converting plant operating mode；Described DC pole control system is provided with double
Pole synchronizes solution/locking unit, bipolar current follows unit and bipolar jumping unit, and bipolar synchronization solution/locking unit uses and synchronizes
Solution/locking processing mode carries out solving/and locking order performs process, and bipolar current is followed unit and is used bipolar current to follow process side
Formula carries out earth current control, and bipolar jumping unit uses bipolar jumping process to carry out bipolar locking process；Described direct current protecting
System carries out ground protection.The present invention, by earthed switch chain condition in the station of optimization direct current station Ore-controlling Role, optimizes direct current station
" the earthing pole connection status " of Ore-controlling Role, the bipolar synchronizing unlocking optimizing DC pole control system processes, and increases DC pole control system
Bipolar current follow process, the bipolar jumping increasing DC pole control system processes and optimizes the earthed system of DC protection system
Protection, overcomes the deficiencies in the prior art, solves when DC engineering uses the interior grounded screen in station as earthing pole and keeps bipolar flat
The difficult problem that weighing apparatus runs.Make the unblocking of the two poles of the earth, emergency outage is completed in a relatively short time, it is possible to reduce earth current and
Duration, the present invention is scientific and effective, it is possible to meet the demand of engineer applied.
Accompanying drawing explanation
Fig. 1 is using the earth as the DC engineering schematic diagram of earthing pole in prior art；
Fig. 2 is the part-structure schematic diagram that DC engineering of the present invention no ground pole mode runs system；
Fig. 3 is the structural representation of the bipolar synchronization solution/locking unit that DC engineering of the present invention no ground pole mode is run；
Fig. 4 is the unblock logic chart that extra-high voltage direct-current engineering of the prior art has earthing pole to run；
The bipolar current that Fig. 5 DC engineering no ground pole mode is run follows the logic chart of process；
The structural representation of the bipolar jumping unit that Fig. 6 DC engineering no ground pole mode is run.
In Fig. 1, Fig. 6, including:
Order unit 100, pole one pole control system 200, pole two pole control system 300,
First selector 400, second selector 500, Ore-controlling Role 600 of standing,
Pole one valve group controller 700, pole two valve group controller 800.
Detailed description of the invention
The invention will be further described with the following Examples.
Embodiment 1.
The control protection processing method that a kind of DC engineering no ground pole mode is run, is to connect for nothing as shown in Figure 2
Earth polar mode DC engineering.Comparing Fig. 1, the straight-flow system shown in Fig. 2 is not owing to having greatly as earthing pole, but uses station interior
Grounded screen, as earthing pole, to effectively run, needs operationally to keep bipolar balance.
Control that the DC engineering no ground pole mode of this example is run protection processing method, by direct current station Ore-controlling Role,
DC pole control system and DC protection system overall co-ordination are controlled protection.
Earthed switch chain condition in station is set to meet by force by direct current station Ore-controlling Role, enables order unit to described
Earthed switch carries out point, closes order control in standing.Order unit can be human-computer interaction interface, is ordered by human-computer interaction interface
Order is arranged.Corresponding, the on off state SER event class of human-computer interaction interface is changed into " alarm " by " state ", switch jump
Time operations staff just can be made to find in time.
The earthing pole connection status Rule of judgment of direct current station Ore-controlling Role is set to: directly independent by converting plant in converting plant
Judge, cancel and the incidence relation of earthed switch point state in station, earthed switch in Inverter Station will be used for judging converting plant station
The conditional force dividing state meets.The Rule of judgment of the earthing pole connection status of direct current station Ore-controlling Role, converting plant cancels interior with station
What earthed switch divided the incidence relation of state, i.e. earthing pole connection status meets whether the condition interior earthed switch that need not judge to stand is located
In a point position, in order in station, earthed switch remains to meet earthing pole when of being in conjunction position and is in connection status, and inverter side is delivered to
" the bipole arrangement state " that work station shows uses the connection status judged station earthing pole, as long as in the station in decision logic
The conditional force of point state of earthed switch meets.
DC pole control system is provided with bipolar synchronization solution/locking unit, bipolar current follows unit and bipolar jumping unit,
Bipolar synchronization solutions/locking unit use synchronization solution/locking processing mode carry out solving/locking order performs process, bipolar current with
Use bipolar current to follow processing mode with unit and carry out earth current control, bipolar jumping unit use bipolar jumping process into
Row bipolar locking processes.
DC protection system then carries out ground protection.
Concrete, bipolar synchronization solution/locking unit, as it is shown on figure 3, be provided with first selector 400 and second selector
500, the output of order unit 100 respectively with input, the input of pole two pole control system 300 of pole one pole control system 200
Connect.
The output of pole one pole control system 200 is connected with the input of first selector 400, and first selector 400 is arranged
There are the first output and the second output, the first output of first selector 400 and the input of pole one valve group controller 700
Connecting, the second output of first selector 400 is connected with the first input end of station Ore-controlling Role 600, the first of Ore-controlling Role 600 of standing
Output is connected with the feedback input end of pole one pole control system, the feedback output end of pole one pole control system and pole one valve group controller
Feedback input end connect, pole one valve group controller includes the low valve control of the high valve control in pole one and pole one, pole one high threshold control
Device processed is bi-directionally connected with the high end valve group of pole one, and the low valve control in pole one is bi-directionally connected with the low end valve group of pole one.
The output of pole two pole control system 300 is connected with the input of second selector 500, and second selector 500 is arranged
There are the first output and the second output, the first output of second selector 500 and the input of pole two valve group controller 800
Connecting, the second output of second selector 500 is connected with the second input of station Ore-controlling Role 600, the second of Ore-controlling Role 600 of standing
Output is connected with the feedback input end of pole two pole control system, the feedback output end of pole two pole control system and pole two valve group controller
Feedback input end connect, pole two valve group controller includes the low valve control of the high valve control in pole two and pole two, pole two high threshold control
Device processed is bi-directionally connected with the high end valve group of pole two, and the low valve control in pole two is bi-directionally connected with the low end valve group of pole two.
First selector 400 is identical with second selector 500, all with the mode of connection control word of DC fields for judging bar
Part.When DC fields is in monopolar metallic return configuration mode, mode of connection control word is 0, and first selector 400 turns on first
Output, second selector 500 turns on the first output；The mode of connection when DC fields is in bipolar Ground return configuration mode
Control word is 1, and first selector 400 turns on the second output, and second selector 500 turns on the second output.
It should be noted that as general knowledge known in this field, pole one refers to corresponding positive polarity in extra-high voltage direct-current engineering
Pole, pole two refers to the pole of corresponding negative polarity in extra-high voltage direct-current engineering.High end valve group is the valve group that corresponding voltage is high, low end valve group
It it is the valve group that corresponding voltage is low.
This bipolar synchronization solution/locking unit carries out bipolar synchronization solution/locking and processes specifically:
Order unit 100 issues pole one pole control system 200 corresponding to solution/locking order, pole two pole control system 300, the
One selector 400, second selector 500 select signal output channels according to mode of connection control word；
When mode of connection control word is 0, first selector 400 turns on what order unit 100 was issued by the first output
Solution/locking order input extremely one valve group controller 700, second selector 500 turns on the first output by order unit 100 times
The solution sent out/locking order input extremely two valve group controllers 800, by pole one valve group controller 700, pole two valve group controller 800
Correspondence performs solution/locking startup work respectively, is i.e. controlled the high end valve group of pole one by the high valve control in pole one, by pole one low end valve group
Controller controls the low end valve group correspondence respectively of pole one and performs solution/block action, the high valve control in pole two control the height of pole two
End valve group, the low end valve group respectively correspondence being controlled pole two by pole two low end valve group controller perform solution/block action；
When mode of connection control word is 1, first selector conducting the second output of first selector, second selector
Order unit 100 is issued to bipolar solution/locking order and inputs to control of standing by the second output of conducting second selector respectively
System 600, Ore-controlling Role 600 of standing carries out station control and operates to arrive at a station control signal received bipolar solution/locking order, Ore-controlling Role of standing
Station control signal is synchronized corresponding feedback respectively and beams back pole one pole control system, pole two pole control system by the feedback output end of 600, then by pole
Feedback signal is issued pole one valve group controller by feedback input end by one pole control system, by pole two pole control system by feedback signal
Pole two valve group controller is issued by feedback input end, the most right by pole one valve group controller 700, pole two valve group controller 800
Solution/block action should be performed, i.e. controlled the high end valve group of pole one by the high valve control in pole one, by pole one low end valve group controller control
The low end valve group of pole one processed correspondence respectively performs solution/block action, by the high valve control in pole two control pole two high end valve group, by
Pole two low end valve group controller controls the low end valve group correspondence respectively of pole two and performs solution/block action.
Concrete, Ore-controlling Role 600 of standing carries out station control and operates to arrive at a station control signal received bipolar solution/locking order,
Carry out especially by following manner:
Unlock a valve group signal when receiving from pole one pole control system 200 and unlock two valve group signals, control from pole, pole two
System 300 receives when unlocking a valve group signal and unlock two valve group signals, proceeds as follows: will be from pole one pole control system
One valve group signal of the unblock that 200 are received and two valve group signals of unblock carry out logic or operation obtains pole one or processes letter
Number；One the valve group signal of unblock received from pole two pole control system 300 or two valve group signals of unblock are carried out logic or behaviour
Make obtain pole two or process signal；With described pole two or process signal, described pole one or process signal are carried out logical AND operation make
Feed back respectively for station control signal and beam back pole one pole control system 200 and pole two pole control system 300；
When receiving one valve group signal of locking or two valve group signals of locking from pole one pole control system 200, control from pole, pole two
When system 300 receives one valve group signal of locking or two valve group signals of locking, proceed as follows: will be from pole one pole control system
One valve group signal of the locking that 200 are received and two valve group signals of locking carry out logic or operation obtains pole one or processes letter
Number；One the valve group signal of locking received from pole two pole control system 300 and two valve group signals of locking are carried out logic or behaviour
Make obtain pole two or process signal；Described pole one or process signal are carried out logic or operation work with described pole two or process signal
Feed back respectively for station control signal and beam back pole one pole control system 200 and pole two pole control system 300.
Wherein, order unit is set to man-machine interface, and the solution that man-machine interface issues/locking order is passed respectively by LAN net
Transport to pole one pole control system 200 and pole two pole control system 300, by controlling between pole one pole control system 200 and station Ore-controlling Role 600
Bus carries out signal alternating transmission, carries out signal by control bus mutual between pole two pole control system 300 and station Ore-controlling Role 600
Transmission.
Bipolar current is followed processing unit and is provided with bipolar released state R-S latch.The high end valve group that pole one is arranged
Enable signal with the firing pulse of low end valve group and carry out logic or operation obtains pole one and lights a fire pulsed logic or signal, pole two is set
The firing pulse of the high end valve group put and low end valve group enable signal carry out logic or operation obtain pole two firing pulse logic or
Signal, then is lighted a fire in pole one pulsed logic or signal and pole two firing pulse logic or signal carries out logical AND operation, as R-S
" S " signal of latch, when bipolar released state signal is 0, represents that monopolar metallic return unlocks, when bipolar released state is believed
When number being 1, represent that bipolar Ground return unlocks.
Bipolar current is followed process and is realized especially by following manner:
As shown in Figure 4, read the bipolar released state signal of R-S latch output,
When bipolar released state signal is 0, pass using the current-order calculated value of this pole as final current reference value
Deliver to valve group controller；
When bipolar released state signal is 1, process according to following concrete condition:
1) calculate absolute difference, specifically receive current reference value to pole, do with the current-order calculated value of this pole
Difference, and difference is taken absolute value；
2) absolute difference being compared with current reference value regulation dead band, current reference value regulation the dead time is
50A；
When absolute value is not more than regulation dead band, pass using the current-order calculated value of this pole as final current reference value
Deliver to valve group controller；
When absolute value is more than regulation dead band, receives current reference value to pole, compare with the current reference value of this pole
Relatively and take little, using little current reference value as smaller value；When this pole is pole a period of time, using above-mentioned smaller value as final electric current
Reference value is sent to valve group controller；When this pole is pole two, and when occurring current reference value to follow, deduct with above-mentioned smaller value
Result after 15A is sent to valve group controller as final current reference value.
Concrete, as it is shown in figure 5, bipolar jumping unit carries out bipolar jumping and processes specifically:
Pole one pole control system 200, pole two pole control system 300 respectively by pole, this pole control, pole protection, group control, group protection and
Outside trip signal carries out logic or operation, respectively obtains the emergency outage signal of this pole, i.e. pole one under bipolar released state
Emergency outage signal and the emergency outage signal of pole two；
The emergency outage signal of this pole is sent out respectively by pole one pole control system 200, pole two pole control system 300 by controlling bus
Deliver to Ore-controlling Role 600 of standing；
Ore-controlling Role 600 of standing the emergency outage signal of received pole one, the emergency outage signal of pole two are carried out logic or
Operation obtains or operates emergency outage signal, and rectification side or will operate emergency outage signal and sends extremely one pole by controlling bus
Ore-controlling Role 200 and pole two pole control system 300, pole one pole control system, pole two are controlled electrode systems and are sent extremely by emergency outage signal respectively
Pole one valve group controller, pole two valve group controller perform emergency outage action；Inverter side is sent out by controlling bus with block signal
Delivering to pole one pole control system 200 and pole two pole control system 300, electrode systems is controlled respectively by block signal in pole one pole control system, pole two
Send extremely one valve group controller, pole two valve group controller performs block action.
DC protection system then carries out ground protection, specifically:
In rectification side station, grounded screen overcurrent protection 76SG 1 section is set to the request of bipolar balance movement, and its definite value is
0.01p.u., fixed value adjusting principle flows into relatively large unbalance electric current for a long time for taking grounded screen；
Rectification side increases grounded screen overcurrent protection 76SG 4 sections in station, and definite value 0.3p.u., time delay 350ms, fixed value adjusting is former
Then for unblock moment imbalance DC current peak value of hiding, delayed setting principle is bipolar jumping function action time and the start and stop of hiding
The uneven time issuable etc. sequence operation；
In rectification side optimization station, earthed system protection 1 section of time delay of 87GSP is 2s, and delayed setting principle is grounded screen in station
The electric current flowing into 1pu not can exceed that 1s, takes the differential of 1s；
Rectification side increases earthed system protection 87GSP 2 sections in station, and definite value 0.3p.u., time delay 500ms, fixed value adjusting is former
Then for unblock moment imbalance DC current peak value of hiding, delayed setting principle is that 76SG IV section coordinates, and takes the time stage of 0.15s
Difference；
Inverter side amendment 2 sections of definite values of ground electrode circuit overload protection 76EL are 0.15p.u., and time delay 750ms, definite value is whole
Determining principle and unlock moment imbalance DC current peak value for hiding, delayed setting principle is to coordinate with rectification side 87GSP 2 sections, takes
The time of 0.25s is differential.
The ground protection of DC protection system also includes, the unwanted protected location of locking rectification side, prevents its misoperation
Cause the stoppage in transit that system is unnecessary, such as grounding electrode electric current unbalance protection unit and earthing pole over-current protecting unit.
Additionally, under conditions of the no ground pole of rectification side is run, grounding electrode electric current IDEE1 and IDEE2 two is measured logical
Road fault-signal shielding, prevents the locking caused because of Measurement channel fault.
The control protection processing method that a kind of DC engineering no ground pole mode of the present invention is run, by direct current station control system
System, DC pole control system and DC protection system cooperation are controlled protection.The present invention is by optimizing the station of direct current station Ore-controlling Role
Interior earthed switch chain condition, optimizes " the earthing pole connection status " of direct current station Ore-controlling Role, optimizes the bipolar of DC pole control system
Synchronizing unlocking processes, and the bipolar current increasing DC pole control system follows process, increases at the bipolar jumping of DC pole control system
The earthed system protection of reason and optimization DC protection system, overcomes the deficiencies in the prior art, solves DC engineering and uses station
A difficult problem for bipolar balance movement is kept when interior grounded screen is as earthing pole.Make the unblocking of the two poles of the earth, emergency outage shorter
Complete in time, it is possible to reducing earth current and duration thereof, the present invention is scientific and effective, it is possible to meet the need of engineer applied
Ask.
In order to effectively realize the effect of the present invention, the current balance type of the station Ore-controlling Role 600 of DC engineering controls subelement
Earth current reference value is revised as-0.0048p.u./-15A by 0p.u..The current balance type of Ore-controlling Role 600 of standing controls subelement
Adjustable range is revised as the 0.8% of rated current by the 2% of rated current, to coordinate bipolar current to follow function.Stand Ore-controlling Role 600
Current balance type control subelement input quantity by IdEE1+IdEE2+IdSG(grounding electrode electric current and station in earthed switch electric current it
With) it is revised as the interior earthed switch electric current IdSG that stands, bonding electrode current IdEE1+IdEE2 measurement amount.
Under the bipolar the earth method of operation, by optimizing bipolar synchronization solution/blocking function so that operations staff is on man-machine boundary
After face issues bipolar solution/locking order, shorten valve group and control the exectorial time difference, it is ensured that non-fully synchronize in solution/locking
The decreased duration of period earth current higher value is in the range of requiring.Function and increase is followed by increasing bipolar current
Limit overload function, it is ensured that when the electric current of direct current operationally certain pole changes, the electric current of another pole can be quick
Trace into identical current reference value, reduce earth current and duration thereof.Break down close in certain valve group of direct current or pole
When lock or emergency outage, in standing, grounded screen can flow through bigger earth current, now by increasing bipolar jumping function, the tightliest
Jerk transports remaining valve group, controls size and the duration of earth current, and DC protection system is controlled protection.By upper
State the common effect of system, it is achieved that bipolar balance movement so that flow through the earth current size of grounded screen in station and lasting time
Between disclosure satisfy that the needs that engineering safety runs.
The present invention is directed to actual DC engineering operation needs, it is provided that a kind of extra-high voltage direct-current engineering no ground pole mode is run
Control processing method, overcome the deficiencies in the prior art, solve DC engineering use station in grounded screen as earthing pole time
Keep a difficult problem for bipolar balance movement.Make the unblocking of the two poles of the earth, emergency outage synchronously completes in the short period of time, it is possible to subtract
Little earth current and duration thereof, the present invention is scientific and effective, it is possible to meet the demand of engineer applied.
The present invention is applied to power transmission Guangdong, waxy common wheat power station ± 800kV extra-high voltage direct-current transmission engineering, and practice is sent out
Existing, the present invention solves the difficult problem keeping bipolar balance movement when DC engineering uses the interior grounded screen in station as earthing pole.Make
The unblocking of the two poles of the earth, emergency outage is completed in a relatively short time, it is possible to reduce earth current and duration, section of the present invention
Learn effectively, it is possible to meet the demand of engineer applied.
It is last it should be noted that, the present invention is only protected by above example in order to technical scheme to be described
The restriction of scope, although being explained in detail the present invention with reference to preferred embodiment, those of ordinary skill in the art should manage
Solve, technical scheme can be modified or equivalent, without deviating from technical solution of the present invention essence and
Scope.
Claims (3)
1. the control protection processing method that a DC engineering no ground pole mode is run, it is characterised in that: controlled by direct current station
System, DC pole control system and DC protection system entirety are controlled protection；
Earthed switch chain condition in station is set to meet by force by described direct current station Ore-controlling Role, enables order unit to described
Earthed switch carries out point, closes order control in standing；
The earthing pole connection status Rule of judgment of described direct current station Ore-controlling Role is set to: directly independent by converting plant in converting plant
Judge, cancel and the incidence relation of earthed switch point state in station, earthed switch in Inverter Station will be used for judging converting plant station
The conditional force dividing state meets；
Described DC pole control system is provided with bipolar synchronization solution/locking unit, bipolar current follows unit and bipolar jumping unit,
Bipolar synchronization solutions/locking unit use synchronization solution/locking processing mode carry out solving/locking order performs process, bipolar current with
Use bipolar current to follow processing mode with unit and carry out earth current control, bipolar jumping unit use bipolar jumping process into
Row bipolar locking processes；
Described DC protection system carries out ground protection；
Described bipolar synchronization solution/locking unit is provided with first selector and second selector, and the output of order unit is respectively
It is connected with input, the input of pole two pole control system of pole one pole control system；
The output of described pole one pole control system is connected with the input of described first selector, and described first selector is provided with
First output and the second output, the first output of first selector connects with the first input end of pole one valve group controller
Connecing, the second output of first selector is connected with the first input end of station Ore-controlling Role, the first output of Ore-controlling Role of standing and institute
The feedback input end stating pole one pole control system connects, and the feedback output end of described pole one pole control system controls with described pole one valve group
The feedback input end of device connects, and described pole one valve group controller includes the low valve control of the high valve control in pole one and pole one, described
The high valve control in pole one is bi-directionally connected with the high end valve group of pole one, and the low valve control in described pole one is two-way with the low end valve group of pole one
Connect；
The output of described pole two pole control system is connected with the input of described second selector, and described second selector is provided with
First output and the second output, the first output of second selector is connected with the input of pole two valve group controller, the
Second output of two selectors is connected with the second input of station Ore-controlling Role, the second output of Ore-controlling Role of standing and described pole two
The feedback input end of pole control system connects, and the feedback output end of described pole two pole control system is anti-with described pole two valve group controller
Feedback input connects, and described pole two valve group controller includes the low valve control of the high valve control in pole two and pole two, and described pole two is high
Valve control is bi-directionally connected with the high end valve group of pole two, and the low valve control in described pole two is bi-directionally connected with the low end valve group of pole two；
Described first selector is identical with described second selector, all with the mode of connection control word of DC fields as Rule of judgment；
When DC fields is in monopolar metallic return configuration mode, mode of connection control word is 0, the first output of first selector
End conducting, the first output conducting of second selector；The mode of connection when DC fields is in bipolar Ground return configuration mode
Control word is 1, the second output conducting of first selector, the second output conducting of second selector；
Described bipolar synchronization solution/locking unit carries out bipolar synchronization solution/locking and processes specifically:
Order unit issues solution/locking order to corresponding pole one pole control system, pole two pole control system, first selector, second
Selector selects signal output channels according to mode of connection control word；
When mode of connection control word is 0, order unit is issued by the first output of first selector conducting first selector
Solution/locking order input extremely one valve group controller, the first output of second selector conducting second selector will order
The solution that unit issues/locking order input extremely two valve group controllers, by the high valve control in pole one control pole one high end valve group,
The low end valve group correspondence respectively being controlled pole one by pole one low end valve group controller performs solution/block action, pole two high threshold control
Device controls the high end valve group of pole two, is solved by low end valve group corresponding execution the respectively of pole two low end valve group controller control pole two/closed
Lock action；
When mode of connection control word is 1, first selector conducting the second output of first selector, second selector conducting
Order unit is issued to bipolar solution/locking order and inputs to Ore-controlling Role of standing by the second output of second selector respectively, stands
Ore-controlling Role carries out station control and operates to arrive at a station control signal received bipolar solution/locking order, the feedback output end of Ore-controlling Role of standing
Station control signal is synchronized corresponding feedback respectively and beams back pole one pole control system, pole two pole control system, then will be anti-by pole one pole control system
Feedback signal issues pole one valve group controller by feedback input end, pole two pole control system feedback signal is passed through feedback input end
Issue pole two valve group controller, the high valve control in pole one control the high end valve group of pole one, by pole one low end valve group controller control
The low end valve group of pole one processed correspondence respectively performs solution/block action, by the high valve control in pole two control pole two high end valve group, by
Pole two low end valve group controller controls the low end valve group correspondence respectively of pole two and performs solution/block action；
Described station Ore-controlling Role carries out station control and operates to arrive at a station control signal, especially by such as received bipolar solution/locking order
Under type is carried out:
Unlock a valve group signal when receiving from pole one pole control system and unlock two valve group signals, receive from pole two pole control system
When unlocking a valve group signal and unlock two valve group signals, proceed as follows: the solution that will be received from pole one pole control system
Lock a valve group signal and two valve group signals of unblock carry out logic or operation obtains pole one or processes signal；To control from pole, pole two
One valve group signal of the unblock that system is received or two valve group signals of unblock carry out logic or operation obtains pole two or processes letter
Number；With described pole two or process signal, described pole one or process signal are carried out logical AND operation distinguish as station control signal simultaneously
Feedback beams back pole one pole control system and pole two pole control system；
When receiving one valve group signal of locking or two valve group signals of locking from pole one pole control system, receive from pole two pole control system
When one valve group signal of locking or two valve group signals of locking, proceed as follows: by closing of being received from pole one pole control system
Lock a valve group signal and two valve group signals of locking carry out logic or operation obtains pole one or processes signal；To control from pole, pole two
One valve group signal of the locking that system is received and two valve group signals of locking carry out logic or operation obtains pole two or processes letter
Number；Described pole one or process signal are carried out logic or operation as the most corresponding while of the control signal of station with described pole two or process signal
Feedback beams back pole one pole control system and pole two pole control system；
Described order unit is set to man-machine interface, and the solution that man-machine interface issues/locking order is transmitted separately to pole by LAN net
One pole control system and pole two pole control system, carry out signal by control bus between pole one pole control system and station Ore-controlling Role and pass alternately
Defeated, carry out signal alternating transmission by control bus between pole two pole control system and station Ore-controlling Role；
Described bipolar current is followed unit and is provided with bipolar released state R-S latch,
The high end valve group arranging pole one and the firing pulse enable signal of low end valve group carry out logic or operation obtains pole a bit
Fire pulsed logic or signal, the high end valve group arranging pole two and the firing pulse of low end valve group enable signal and carry out logic or behaviour
Make to obtain pole two firing pulse logic or signal, then is lighted a fire in pole one pulsed logic or signal and pole two firing pulse logic or letter
Number carry out logical AND operation, as " S " signal of R-S latch, when bipolar released state signal is 0, represent one pole metal
Loop line unlocks, and when bipolar released state signal is 1, represents that bipolar Ground return unlocks；
Described bipolar current is followed process and is realized especially by following manner:
Read the bipolar released state signal of R-S latch output,
When bipolar released state signal is 0, it is sent to using the current-order calculated value of this pole as final current reference value
Valve group controller；
When bipolar released state signal is 1, process according to following concrete condition:
1) calculate absolute difference, specifically receive current reference value to pole, do difference with the current-order calculated value of this pole, and
Difference is taken absolute value；
2) absolute difference is compared with current reference value regulation dead band,
When absolute value is not more than regulation dead band, it is sent to using the current-order calculated value of this pole as final current reference value
Valve group controller；
When absolute value is more than regulation dead band, receives current reference value to pole, compare also with the current reference value of this pole
Take little, using little current reference value as smaller value；When this pole is pole a period of time, using above-mentioned smaller value as final current reference
Value is sent to valve group controller；When this pole is pole two, and when occurring current reference value to follow, after deducting 15A with above-mentioned smaller value
Result be sent to valve group controller as final current reference value；
Current reference value regulation the dead time is 50A；
Described bipolar jumping unit carries out bipolar jumping and processes specifically:
Pole, this pole is controlled by pole one pole control system, pole two pole control system respectively, pole is protected, group is controlled, organize protection and outside tripping operation is believed
Number carry out logic or operation, under bipolar released state, respectively obtain the emergency outage signal of this pole；
The emergency outage signal of this pole is sent respectively to station control system by pole one pole control system, pole two pole control system by controlling bus
System；
Stand Ore-controlling Role to the emergency outage signal of received pole one, the emergency outage signal of pole two carries out logic or operation obtains
Or operation emergency outage signal, rectification side will or operation emergency outage signal by control bus send extremely one pole control system and
Pole two pole control system, pole one pole control system, pole two control electrode systems respectively by emergency outage signal send extremely one valve group controller,
Pole two valve group controller performs emergency outage action, and inverter side sends extremely one pole control system with block signal by controlling bus
With pole two pole control system, pole one pole control system, pole two are controlled electrode systems and respectively block signal are sent extremely one valve group controller, pole
Two valve group controllers perform block action；
The ground protection of described DC protection system is specifically:
In rectification side station, grounded screen overcurrent protection 76SG 1 section is set to the request of bipolar balance movement, and its definite value is 0.01p.u.；
Rectification side is provided with grounded screen overcurrent protection 76SG 4 sections in station, and definite value is 0.3p.u., time delay 350ms；
In rectification side station, earthed system protection 1 section of time delay of 87GSP is 2s；
Rectification side is provided with earthed system protection 87GSP 2 sections in station, definite value 0.3p.u., time delay 500ms；
2 sections of definite values of ground electrode circuit overload protection 76EL of inverter side are 0.15p.u., time delay 750ms.
The control protection processing method that DC engineering the most according to claim 1 no ground pole mode is run, its feature exists
In:
The ground protection of described DC protection system also includes, the grounding electrode electric current unbalance protection unit of locking rectification side and connecing
Earth polar over-current protecting unit.
The control protection processing method that DC engineering the most according to claim 2 no ground pole mode is run, its feature exists
In:
The ground protection of described DC protection system also includes, under conditions of the no ground pole of rectification side is run, by earthing pole electricity
Two Measurement channel fault-signal shieldings of stream IDEE1 and IDEE2.
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| CN104377686A (en) * | 2014-11-10 | 2015-02-25 | 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 | Electrode unlocking method for high-voltage direct current converter station with no grounding electrode operation |
| CN108075380B (en) * | 2016-11-17 | 2020-08-21 | 中国电力科学研究院 | Converter station grounding grid design method capable of replacing direct current grounding electrode and grounding grid |
| CN109738749B (en) * | 2019-01-04 | 2020-11-24 | 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 | Method for detecting primary circuit disconnection and no current of direct current filter in direct current transmission project |
| CN110912088B (en) * | 2019-11-21 | 2021-01-15 | 中国南方电网有限责任公司超高压输电公司昆明局 | Multi-terminal direct current engineering protection system based on high-speed parallel switch |
| CN110970879B (en) * | 2019-12-26 | 2021-10-01 | 南京南瑞继保电气有限公司 | Method and device for controlling valve area ground fault of extra-high voltage direct current low-side converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201044358Y (en) * | 2007-04-30 | 2008-04-02 | 中国电力工程顾问集团中南电力设计院 | High voltage direct current transmission split type earth electrode |
| CN103812100A (en) * | 2014-01-17 | 2014-05-21 | 国家电网公司 | Lock-up control method for DC (Direct Current) power fluctuation of weak AC receiving power grid |
-
2014
- 2014-10-09 CN CN201410526913.7A patent/CN104242292B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201044358Y (en) * | 2007-04-30 | 2008-04-02 | 中国电力工程顾问集团中南电力设计院 | High voltage direct current transmission split type earth electrode |
| CN103812100A (en) * | 2014-01-17 | 2014-05-21 | 国家电网公司 | Lock-up control method for DC (Direct Current) power fluctuation of weak AC receiving power grid |
Non-Patent Citations (2)
| Title |
|---|
| 云广特高压直流输电工程站控系统的设计缺陷及改进分析;张爱玲等;《电力系统保护与控制》;20110216;第39卷(第4期);全文 * |
| 特高压直流换流站顺序控制的研究;涂仁川;《南方电网技术》;20080831;第2卷(第4期);全文 * |
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