CN104242292A - Control protection processing method of grounding-pole-free mode operating of direct-current engineering - Google Patents
Control protection processing method of grounding-pole-free mode operating of direct-current engineering Download PDFInfo
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Abstract
Disclosed is a control protection processing method of a grounding-pole-free mode operating of direct-current engineering. A direct-current station control system, a direct-current pole control system and a direct-current protection system are matched to realize control protection, an instation grounding switch interlocking condition is set as forced satisfaction by the direct-current station control system, and by the direct-current station control system, a judgment condition of the grounding pole connecting states is set as cancelling relevancy to the instation grounding switch sub-states in a rectifier station, and in an inverter, a judgment condition for instation grounding switch sub-states in the rectifier station is set as forced satisfaction. The direct-current pole control system is provided with a bipolar synchronous locking/unlocking unit, a bipolar current follow unit and a bipolar intertrip unit. The control protection processing method solves the problem of keeping bipolar balance operating when the direct-current engineering uses an instation grounding grid as a grounding pole, and is scientific, effective and capable of meeting demands of engineering application.
Description
Technical field
The present invention relates to technical field of power systems, particularly the Control protection processing method run of a kind of DC engineering no ground pole mode.
Background technology
Earth electrode is the important component part of customary DC engineering, not only play the effect clamping down on DC point current potential, also for direct current monopolar ground circuit operation mode, bipolar two-terminal-grounding mode provide the path returned as electric current using the earth, if therefore there is no earth electrode, although direct current can clamp down on DC point current potential by ground network in station, but can not with the earth as current return path, if there is one pole locking when therefore DC bipolar runs, then direct current will not have commutating circuit and cause bipolar locking.Direct current will can not bipolarly run usually, and can only run in monopolar metallic return mode, and this will cause direct current conveying capacity to reduce half, greatly affect the availability factor of DC engineering.
In Practical Project, because a variety of causes can exist in time or cannot cannot build up the situation of earth electrode, must rectification side to use in station ground network temporarily as earth electrode to keep DC bipolar balance movement to improve the ability of supplying electric power of general emigrant's direct current.But, under existing technical conditions, when rectification side uses ground network as earth point, because ground grid design principle is different from earth electrode, one pole the earth operational mode cannot be used for.In addition, for reducing earth current and duration as much as possible, the unblocking of the two poles of the earth must be made, emergency outage completes within the time short as far as possible; Consider the galvano-cautery of earth current to ground network simultaneously, cathode protection method must be adopted to protect ground network, and prior art all cannot meet above-mentioned requirements at present.
Therefore, not enough for prior art, provide that a kind of to be applicable to the control treatment method that DC engineering no ground pole mode runs very necessary to overcome prior art deficiency.
Summary of the invention
For overcoming the deficiencies in the prior art, the invention provides the Control protection processing method that a kind of DC engineering no ground pole mode is run, DC engineering can be solved and use the interior ground network in station temporarily as the difficult problem keeping bipolar balance movement during earth electrode.
Above-mentioned purpose of the present invention is realized by following technology technical scheme:
A kind of DC engineering no ground pole Control protection processing method that mode is run is provided, carries out Control protection by direct current station Ore-controlling Role, DC pole control system and DC protection system entirety;
Earthed switch chain condition in station is set to meet by force by described direct current station Ore-controlling Role, command unit to be carried out point earthed switch in described station, closes order and control;
The earth electrode connection status Rule of judgment of described direct current station Ore-controlling Role is set to: directly judged separately by converting plant in converting plant, cancelling the incidence relation dividing state with earthed switch in station, judging that the conditional force of earthed switch point state in converting plant station meets in Inverter Station by being used for;
Described DC pole control system is provided with bipolar synchronous solution/locking unit, bipolar current follows unit and bipolar jumping unit, bipolar synchronous solution/locking unit adopts synchronous solution/locking processing mode to carry out separating/locking command execution process, bipolar current is followed unit and is adopted bipolar current to follow processing mode and carry out earth current control, and bipolar jumping unit adopts bipolar jumping process to carry out bipolar locking process;
Described DC protection system carries out ground protection.
Preferably, above-mentioned bipolar synchronous solution/locking unit is provided with first selector and second selector, and the output of command unit is connected with the input of pole one pole control system, the input of pole two pole control system respectively;
The output of described pole one pole control system is connected with the input of described first selector, described first selector is provided with the first output and the second output, first output of first selector is connected with the first input end of pole one valve group controller, 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 is connected with the feedback input end of described pole one pole control system, the feedback output end of described pole one pole control system is connected with the feedback input end of described pole one valve group controller, described pole one valve group controller comprises the low valve control of the high valve control in pole one and pole one, the high end valve group of the high valve control in described pole one and pole one is bi-directionally connected, the low end valve group of the low valve control in described pole one and pole one is bi-directionally connected,
The output of described pole two pole control system is connected with the input of described second selector, described second selector is provided with the first output and the second output, first output of second selector is connected with the input of pole two valve group controller, 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 is connected with the feedback input end of described pole two pole control system, the feedback output end of described pole two pole control system is connected with the feedback input end of described pole two valve group controller, described pole two valve group controller comprises the low valve control of the high valve control in pole two and pole two, the high end valve group of the high valve control in described pole two and pole two is bi-directionally connected, the low end valve group of the low valve control in described pole two and pole two is bi-directionally connected,
Described first selector is identical with described second selector, all with the mode of connection control word of DC fields for Rule of judgment;
When DC fields is in monopolar metallic return configuration mode, mode of connection control word is 0, the first output conducting of first selector, the first output conducting of second selector; When DC fields is in bipolar Ground return configuration mode, mode of connection control word is 1, the second output conducting of first selector, the second output conducting of second selector;
Described bipolar synchronous solution/locking unit carries out bipolar synchronous solution/locking process specifically:
Command unit issues solution/locking order to corresponding pole one pole control system, pole two pole control system, and first selector, second selector select signal output channels according to mode of connection control word;
When mode of connection control word is 0, solution/locking order that command unit issues by the first output of first selector conducting first selector inputs an extremely valve group controller, solution/locking order that command unit issues by the first output of second selector conducting second selector inputs extremely two valve group controllers, namely the high end valve group of pole one is controlled by the high valve control in pole one, the low end valve group corresponding execution solution/block action respectively of pole one is controlled by pole one low end valve group controller, the high end valve group of pole two is controlled by the high valve control in pole two, the low end valve group corresponding execution solution/block action respectively of pole two is controlled by pole two low end valve group controller,
When mode of connection control word is 1, second output of first selector conducting first selector, command unit is issued to bipolar solution/locking order and inputs to station Ore-controlling Role by the second output of second selector conducting second selector respectively, Ore-controlling Role of standing carries out station control to received bipolar solution/locking order and operates to obtain the control signal that arrives at a station, synchronous for station control signal corresponding feedback is respectively beamed back pole one pole control system by the feedback output end of Ore-controlling Role of standing, pole two pole control system, by pole one pole control system, feedback signal is issued pole one valve group controller by feedback input end again, by pole two pole control system, feedback signal is issued pole two valve group controller by feedback input end, the high end valve group of pole one is controlled by the high valve control in pole one, the low end valve group corresponding execution solution/block action respectively of pole one is controlled by pole one low end valve group controller, the high end valve group of pole two is controlled by the high valve control in pole two, the low end valve group corresponding execution solution/block action respectively of pole two is controlled by pole two low end valve group controller.
Above-mentioned station Ore-controlling Role carries out station control to received bipolar solution/locking order and operates to obtain the control signal that arrives at a station, and carries out especially by such as under type:
When receive unblock valve group signal from pole one pole control system and unlock two valve group signals, receive unblock valve group signal from pole two pole control system and unlock two valve group signals time, proceed as follows: by the unblock valve group signal received from pole one pole control system with unlock two valve group signals and carry out logic OR operation and obtain pole one or processing signals; The unblock valve group signal received from pole two pole control system or unblock two valve group signals are carried out logic OR operation and obtains pole two or processing signals; Described pole one or processing signals and described pole two or processing signals are carried out logical AND to operate and to control signal as standing and feed back respectively simultaneously and beam back pole one pole control system and pole two pole control system;
When receiving locking valve group signal or locking two valve group signals from pole one pole control system, when receiving locking valve group signal or locking two valve group signals from pole two pole control system, proceed as follows: the locking valve group signal received from pole one pole control system and locking two valve group signals are carried out logic OR operation and obtain pole one or processing signals; The locking valve group signal received from pole two pole control system and locking two valve group signals are carried out logic OR operation and obtain pole two or processing signals; Described pole one or processing signals and described pole two or processing signals are carried out logic OR operate to control as standing signal simultaneously corresponding feedback beam back pole one pole control system and pole two pole control system.
Mentioned order unit is set to man-machine interface, the solution that man-machine interface issues/locking order transmits extremely a pole control system and pole two pole control system respectively by LAN net, carry out signal alternating transmission by control bus between pole one pole control system and station Ore-controlling Role, between pole two pole control system and station Ore-controlling Role, carry out signal alternating transmission by control bus.
Above-mentioned bipolar current is followed processing unit and is provided with bipolar released state R-S latch,
The high end valve group arrange pole one and the firing pulse enable signal of low end valve group carry out logic OR operation and obtain pole one and to light a fire pulsed logic or signal, the high end valve group arrange pole two and the firing pulse enable signal of low end valve group carry out logic OR operation and obtain pole two firing pulse logic OR signal, lighted a fire pole one again 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 that monopolar metallic return unlocks, when bipolar released state signal is 1, represent that bipolar Ground return unlocks,
Described bipolar current follows process especially by such as under type realization:
Read the bipolar released state signal that R-S latch exports,
When bipolar released state signal is 0, be sent to valve group controller using the current-order calculated value of this pole as final current reference value;
When bipolar released state signal is 1, according to following concrete condition process:
1) calculated difference absolute value, specifically to pole received current reference value, does difference with the current-order calculated value of this pole, and difference is taken absolute value;
2) dead band is regulated to compare absolute difference and current reference value,
When absolute value is not more than adjustment dead band, be sent to valve group controller using the current-order calculated value of this pole as final current reference value;
When absolute value is greater than adjustment dead band, to pole received current reference value, compares with the current reference value of this pole and get little, using little current reference value as smaller value; When this pole is pole a period of time, be sent to valve group controller using above-mentioned smaller value as final current reference value; When this pole is pole two, and when generation current reference value is followed, deduct the result after 15A using above-mentioned smaller value and be sent to valve group controller as final current reference value.
Preferably, current reference value regulates the dead time to be 50A.
Above-mentioned bipolar jumping unit carries out bipolar jumping process 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 trip signal carries out logic OR operation, obtains the emergency outage signal of this pole under bipolar released state respectively;
The emergency outage signal of this pole is sent to station Ore-controlling Role by control bus by pole one pole control system, pole two pole control system respectively;
To stand the emergency outage signal of Ore-controlling Role to received pole one, the emergency outage signal of pole two carries out logic OR operation and obtains or operate emergency outage signal, rectification side or will operate emergency outage signal and sends extremely a pole control system and pole two pole control system by control bus, pole one pole control system, pole two is controlled electrode systems and respectively emergency outage signal is sent an extremely valve group controller, pole two valve group controller performs emergency outage action, inverter side sends extremely a pole control system and pole two pole control system with block signal by control bus, pole one pole control system, pole two is controlled electrode systems and respectively block signal is sent an extremely valve group controller, pole two valve group controller performs block action.
The ground protection of above-mentioned DC protection system is specifically:
In rectification side station, ground network overcurrent protection 76SG 1 section is set to bipolar balance movement request, and its definite value is 0.01p.u.;
Rectification side is provided with ground network overcurrent protection 76SG 4 sections in station, and definite value is 0.3p.u., time delay 350ms;
In rectification side station, grounding system protection 87GSP 1 section of time delay is 2s;
Rectification side is provided with grounding system protection 87GSP 2 sections, definite value 0.3p.u., time delay 500ms in station;
Ground electrode circuit overload protection 76EL 2 sections of definite values of inverter side are 0.15p.u., time delay 750ms.
The ground protection of above-mentioned DC protection system also comprises, the grounding electrode electric current unbalance protection unit of locking rectification side and earth electrode over-current protecting unit.
The ground protection of above-mentioned DC protection system also comprises, under the condition that the no ground pole of rectification side is run, by grounding electrode electric current IDEE1 and IDEE2 two Measurement channel fault-signal shieldings.
The Control protection processing method that the no ground pole of a kind of DC engineering of the present invention mode is run, is coordinated by direct current station Ore-controlling Role, DC pole control system and DC protection system and carries out Control protection; Earthed switch chain condition in station is set to meet by force by described direct current station Ore-controlling Role, command unit to be carried out point earthed switch in described station, closes order and control; In the Ore-controlling Role of described direct current station, earth electrode connection status is judged separately by converting plant operating mode; Described DC pole control system is provided with bipolar synchronous solution/locking unit, bipolar current follows unit and bipolar jumping unit, bipolar synchronous solution/locking unit adopts synchronous solution/locking processing mode to carry out separating/locking command execution process, bipolar current is followed unit and is adopted bipolar current to follow processing mode and carry out earth current control, and bipolar jumping unit adopts bipolar jumping process to carry out bipolar locking process; Described DC protection system carries out ground protection.The present invention is by earthed switch chain condition in the station of optimization direct current station Ore-controlling Role; optimize " the earth electrode connection status " of direct current station Ore-controlling Role; optimize the bipolar synchronizing unlocking process of DC pole control system; the bipolar current increasing DC pole control system follows process; increase the bipolar grounding system protection of jumping process and optimizing DC protection system of DC pole control system; overcome the deficiencies in the prior art, solve DC engineering and use the interior ground network in station as the difficult problem keeping bipolar balance movement during earth electrode.Make the unblocking of the two poles of the earth, emergency outage completes in the short period of time, earth current and duration thereof can be reduced, scientific and effective of the present invention, the demand of engineer applied can be met.
Accompanying drawing explanation
Fig. 1 is using the earth as the DC engineering schematic diagram of earth electrode in prior art;
Fig. 2 is the part-structure schematic diagram of DC engineering of the present invention no ground pole mode operational system;
Fig. 3 is the structural representation of bipolar synchronous solution/locking unit that DC engineering of the present invention no ground pole mode is run;
Fig. 4 is the unblock logic diagram that extra-high voltage direct-current engineering of the prior art has earth electrode to run;
The bipolar current that Fig. 5 DC engineering no ground pole mode is run follows the logic diagram 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, comprising:
Command 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.
Embodiment
The invention will be further described with the following Examples.
embodiment 1.
The Control protection processing method that DC engineering no ground pole mode is run is for no ground pole mode DC engineering as shown in Figure 2.Compare Fig. 1, the direct current system shown in Fig. 2 is due to not greatly as earth electrode, but employing is stood, interior ground network is as earth electrode, to effective operation, needs operationally to keep bipolar balance.
The Control protection processing method that the DC engineering no ground pole mode of this example is run, carries out Control protection by direct current station Ore-controlling Role, DC pole control system and DC protection system overall co-ordination.
Earthed switch chain condition in station is set to meet by force by direct current station Ore-controlling Role, command unit to be carried out point earthed switch in described station, closes order and control.Command unit can be human-computer interaction interface, carries out command set by human-computer interaction interface.Corresponding, the on off state SER event class of human-computer interaction interface is changed into " alarm " by " state ", just can make operations staff's Timeliness coverage when switch jump.
The earth electrode connection status Rule of judgment of direct current station Ore-controlling Role is set to: directly judged separately by converting plant in converting plant, cancelling the incidence relation dividing state with earthed switch in station, judging that the conditional force of earthed switch point state in converting plant station meets in Inverter Station by being used for.The Rule of judgment of the earth electrode connection status of direct current station Ore-controlling Role, converting plant cancels the incidence relation dividing state with earthed switch in station, namely whether the interior earthed switch that need not judge to stand of satisfying condition of earth electrode connection status is in a point position, earth electrode still can be met in earthed switch is in co-bit in station be in connection status, " bipole arrangement state " that inverter side delivers to work station display uses the connection status judged station earth electrode, as long as the conditional force of point state of earthed switch in the station in decision logic is met.
DC pole control system is provided with bipolar synchronous solution/locking unit, bipolar current follows unit and bipolar jumping unit, bipolar synchronous solution/locking unit adopts synchronous solution/locking processing mode to carry out separating/locking command execution process, bipolar current is followed unit and is adopted bipolar current to follow processing mode and carry out earth current control, and bipolar jumping unit adopts bipolar jumping process to carry out bipolar locking process.
DC protection system then carries out ground protection.
Concrete, bipolar synchronous solution/locking unit, as shown in Figure 3, is provided with first selector 400 and second selector 500, and the output of command unit 100 is connected with the input of pole one pole control system 200, the input of pole two pole control system 300 respectively.
The output of pole one pole control system 200 is connected with the input of first selector 400, first selector 400 is provided with the first output and the second output, first output of first selector 400 is connected with the input of pole one valve group controller 700, second output of first selector 400 is connected with the first input end of station Ore-controlling Role 600, the first output of Ore-controlling Role 600 of standing is connected with the feedback input end of pole one pole control system, the feedback output end of pole one pole control system is connected with the feedback input end of pole one valve group controller, pole one valve group controller comprises the low valve control of the high valve control in pole one and pole one, the high end valve group of the high valve control in pole one and pole one is bi-directionally connected, the low end valve group of the low valve control in pole one and pole one is bi-directionally connected.
The output of pole two pole control system 300 is connected with the input of second selector 500, second selector 500 is provided with the first output and the second output, first output of second selector 500 is connected with the input of pole two valve group controller 800, second output of second selector 500 is connected with the second input of station Ore-controlling Role 600, the second output of Ore-controlling Role 600 of standing is connected with the feedback input end of pole two pole control system, the feedback output end of pole two pole control system is connected with the feedback input end of pole two valve group controller, pole two valve group controller comprises the low valve control of the high valve control in pole two and pole two, the high end valve group of the high valve control in pole two and pole two is bi-directionally connected, the low end valve group of the low valve control in pole two and pole two is bi-directionally connected.
First selector 400 is identical with second selector 500, all with the mode of connection control word of DC fields for Rule of judgment.When DC fields is in monopolar metallic return configuration mode, mode of connection control word is 0, first selector 400 conducting first output, second selector 500 conducting first output; When DC fields is in bipolar Ground return configuration mode, mode of connection control word is 1, first selector 400 conducting second output, second selector 500 conducting second output.
It should be noted that, as general knowledge known in this field, pole one refers to the pole of corresponding positive polarity in extra-high voltage direct-current engineering, and 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, and low end valve group is the valve group that corresponding voltage is low.
This bipolar synchronous solution/locking unit carries out bipolar synchronous solution/locking process specifically:
Command unit 100 issues solution/locking order to corresponding pole one pole control system 200, pole two pole control system 300, and first selector 400, second selector 500 select signal output channels according to mode of connection control word;
When mode of connection control word is 0, the solution that command unit 100 issues by first selector 400 conducting first output/locking order input extremely valve group controller 700, the solution that command unit 100 issues by second selector 500 conducting first output/locking order input extremely two valve group controllers 800, by pole one valve group controller 700, pole two valve group controller 800 is corresponding respectively performs solution/locking startup work, namely the high end valve group of pole one is controlled by the high valve control in pole one, the low end valve group corresponding execution solution/block action respectively of pole one is controlled by pole one low end valve group controller, the high end valve group of pole two is controlled by the high valve control in pole two, the low end valve group corresponding execution solution/block action respectively of pole two is controlled by pole two low end valve group controller,
When mode of connection control word is 1, second output of first selector conducting first selector, command unit 100 is issued to bipolar solution/locking order and inputs to station Ore-controlling Role 600 by the second output of second selector conducting second selector respectively, Ore-controlling Role 600 of standing carries out station control to received bipolar solution/locking order and operates to obtain the control signal that arrives at a station, synchronous for station control signal corresponding feedback is respectively beamed back pole one pole control system by the feedback output end of Ore-controlling Role 600 of standing, pole two pole control system, by pole one pole control system, feedback signal is issued pole one valve group controller by feedback input end again, by pole two pole control system, feedback signal is issued pole two valve group controller by feedback input end, by pole one valve group controller 700, pole two valve group controller 800 is corresponding respectively performs solution/block action, namely the high end valve group of pole one is controlled by the high valve control in pole one, the low end valve group corresponding execution solution/block action respectively of pole one is controlled by pole one low end valve group controller, the high end valve group of pole two is controlled by the high valve control in pole two, the low end valve group corresponding execution solution/block action respectively of pole two is controlled by pole two low end valve group controller.
Concrete, Ore-controlling Role 600 of standing carries out station control to received bipolar solution/locking order and operates to obtain the control signal that arrives at a station, and carries out especially by such as under type:
When receive unblock valve group signal from pole one pole control system 200 and unlock two valve group signals, receive unblock valve group signal from pole two pole control system 300 and unlock two valve group signals time, proceed as follows: by the unblock valve group signal received from pole one pole control system 200 with unlock two valve group signals and carry out logic OR operation and obtain pole one or processing signals; The unblock valve group signal received from pole two pole control system 300 or unblock two valve group signals are carried out logic OR operation and obtains pole two or processing signals; Described pole one or processing signals and described pole two or processing signals are carried out logical AND to operate and to control signal as standing and feed back respectively and beam back pole one pole control system 200 and pole two pole control system 300;
When receiving locking valve group signal or locking two valve group signals from pole one pole control system 200, when receiving locking valve group signal or locking two valve group signals from pole two pole control system 300, proceed as follows: the locking valve group signal received from pole one pole control system 200 and locking two valve group signals are carried out logic OR operation and obtain pole one or processing signals; The locking valve group signal received from pole two pole control system 300 and locking two valve group signals are carried out logic OR operation and obtain pole two or processing signals; Described pole one or processing signals and described pole two or processing signals are carried out logic OR to operate and to control signal as standing and feed back respectively 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, the solution that man-machine interface issues/locking order transmits extremely a pole control system 200 and pole two pole control system 300 respectively by LAN net, carry out signal alternating transmission by control bus between pole one pole control system 200 and station Ore-controlling Role 600, between pole two pole control system 300 and station Ore-controlling Role 600, carry out signal alternating transmission by control bus.
Bipolar current is followed processing unit and is provided with bipolar released state R-S latch.The high end valve group arrange pole one and the firing pulse enable signal of low end valve group carry out logic OR operation and obtain pole one and to light a fire pulsed logic or signal, the high end valve group arrange pole two and the firing pulse enable signal of low end valve group carry out logic OR operation and obtain pole two firing pulse logic OR signal, lighted a fire pole one again 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 that monopolar metallic return unlocks, when bipolar released state signal is 1, represent that bipolar Ground return unlocks.
Bipolar current follows process especially by such as under type realization:
As shown in Figure 4, read the bipolar released state signal that R-S latch exports,
When bipolar released state signal is 0, be sent to valve group controller using the current-order calculated value of this pole as final current reference value;
When bipolar released state signal is 1, according to following concrete condition process:
1) calculated difference absolute value, specifically to pole received current reference value, does difference with the current-order calculated value of this pole, and difference is taken absolute value;
2) regulate dead band to compare absolute difference and current reference value, current reference value regulates the dead time to be 50A;
When absolute value is not more than adjustment dead band, be sent to valve group controller using the current-order calculated value of this pole as final current reference value;
When absolute value is greater than adjustment dead band, to pole received current reference value, compares with the current reference value of this pole and get little, using little current reference value as smaller value; When this pole is pole a period of time, be sent to valve group controller using above-mentioned smaller value as final current reference value; When this pole is pole two, and when generation current reference value is followed, deduct the result after 15A using above-mentioned smaller value and be sent to valve group controller as final current reference value.
Concrete, as shown in Figure 5, bipolar jumping unit carries out bipolar jumping process specifically:
Pole, this pole is controlled by pole one pole control system 200, pole two pole control system 300 respectively, pole is protected, group is controlled, organize protection and outside trip signal carries out logic OR operation, the emergency outage signal of this pole is obtained respectively, i.e. the emergency outage signal of pole one and the emergency outage signal of pole two under bipolar released state;
The emergency outage signal of this pole is sent to station Ore-controlling Role 600 by control bus by pole one pole control system 200, pole two pole control system 300 respectively;
Ore-controlling Role 600 of standing carries out logic OR operation and obtains to the emergency outage signal of received pole one, the emergency outage signal of pole two or operate emergency outage signal, rectification side or will operate emergency outage signal and sends extremely a pole control system 200 and pole two pole control system 300 by control bus, and pole one pole control system, pole two are controlled electrode systems and respectively emergency outage signal sent extremely a valve group controller, the action of pole two valve group controller execution emergency outage; Inverter side sends extremely a pole control system 200 and pole two pole control system 300 with block signal by control bus, and pole one pole control system, pole two are controlled electrode systems and respectively block signal sent extremely a valve group controller, pole two valve group controller execution block action.
DC protection system then carries out ground protection, specifically:
In rectification side station, ground network overcurrent protection 76SG 1 section is set to bipolar balance movement request, and its definite value is 0.01p.u., and fixed value adjusting principle flows into comparatively large unbalance electric current for a long time for getting ground network;
Rectification side increases ground network overcurrent protection 76SG 4 sections in station, definite value 0.3p.u., time delay 350ms, fixed value adjusting principle unlocks moment uneven direct current peak value for hiding, and delayed setting principle is the sequence operations such as bipolar jumping function action time and start and stop of the hiding issuable uneven time;
In rectification side optimization station, grounding system protection 87GSP 1 section of time delay is 2s, and delayed setting principle is that the electric current of ground network inflow 1pu in station more than 1s, can not get the differential of 1s;
Rectification side increases grounding system protection 87GSP 2 sections, definite value 0.3p.u., time delay 500ms in station, and fixed value adjusting principle unlocks moment uneven direct current peak value for hiding, and delayed setting principle is that 76SG IV section coordinates, and the time of getting 0.15s is differential;
Inverter side amendment ground electrode circuit overload protection 76EL 2 sections of definite values are 0.15p.u.; time delay 750ms; fixed value adjusting principle unlocks moment uneven direct current peak value for hiding, and delayed setting principle is coordinate with rectification side 87GSP 2 sections, and the time of getting 0.25s is differential.
The ground protection of DC protection system also comprises, and the unwanted protected location of locking rectification side, prevents the stoppage in transit that its misoperation causes system unnecessary, as grounding electrode electric current unbalance protection unit and earth electrode over-current protecting unit.
In addition, under the condition that the no ground pole of rectification side is run, by grounding electrode electric current IDEE1 and IDEE2 two Measurement channel fault-signal shieldings, the locking because Measurement channel fault causes is prevented.
The Control protection processing method that the no ground pole of a kind of DC engineering of the present invention mode is run, is coordinated by direct current station Ore-controlling Role, DC pole control system and DC protection system and carries out Control protection.The present invention is by earthed switch chain condition in the station of optimization direct current station Ore-controlling Role; optimize " the earth electrode connection status " of direct current station Ore-controlling Role; optimize the bipolar synchronizing unlocking process of DC pole control system; the bipolar current increasing DC pole control system follows process; increase the bipolar grounding system protection of jumping process and optimizing DC protection system of DC pole control system; overcome the deficiencies in the prior art, solve DC engineering and use the interior ground network in station as the difficult problem keeping bipolar balance movement during earth electrode.Make the unblocking of the two poles of the earth, emergency outage completes in the short period of time, earth current and duration thereof can be reduced, scientific and effective of the present invention, the demand of engineer applied can be met.
In order to effectively realize effect of the present invention, the earth current reference value of the current balance type control subelement of the station Ore-controlling Role 600 of DC engineering is revised as-0.0048p.u./-15A by 0p.u..The current balance type of Ore-controlling Role 600 of standing controls the adjustable range of subelement and is revised as 0.8% of rated current by 2% of rated current, follows function to coordinate bipolar current.Stand Ore-controlling Role 600 current balance type control subelement input variable by IdEE1+IdEE2+IdSG(grounding electrode electric current and station in earthed switch electric current sum) be revised as station in earthed switch electric current I dSG, bonding electrode current IdEE1+IdEE2 measuring amount.
Under bipolar the earth operational mode, by optimizing bipolar synchronous solution/blocking function, make operations staff after man-machine interface issues bipolar solution/locking order, shorten valve group and control the exectorial time difference, guarantee that the decreased duration of earth current higher value between solution/locking non-fully sync period is in the scope required.Follow function by increasing bipolar current and increase restriction overload function, when guaranteeing that the electric current of direct current operationally certain pole changes, the electric current of another pole can trace into identical current reference value fast, reduces earth current and duration thereof.When certain valve group of direct current or pole break down locking or emergency outage; in standing, ground network can flow through larger earth current, now by increasing bipolar jumping function, the remaining valve group of rapid emergency outage; control size and the duration of earth current, DC protection system carries out Control protection.By the acting in conjunction of said system, achieve bipolar balance movement, making to flow through the earth current size of ground network in station and duration can meet the needs that engineering safety runs.
The present invention is directed to actual DC engineering operation needs, a kind of extra-high voltage direct-current engineering no ground pole control treatment method that mode is run is provided, overcome the deficiencies in the prior art, solve DC engineering and use the interior ground network in station as the difficult problem keeping bipolar balance movement during earth electrode.Make the unblocking of the two poles of the earth, emergency outage synchronously completes in the short period of time, earth current and duration thereof can be reduced, scientific and effective of the present invention, the demand of engineer applied can be met.
The present invention is applied to power transmission Guangdong, waxy common wheat power station ± 800kV extra-high voltage direct-current transmission engineering, and practice finds, the invention solves DC engineering and uses the interior ground network in station as the difficult problem keeping bipolar balance movement during earth electrode.Make the unblocking of the two poles of the earth, emergency outage completes in the short period of time, earth current and duration thereof can be reduced, scientific and effective of the present invention, the demand of engineer applied can be met.
Finally should be noted that; above embodiment is only in order to illustrate technical scheme of the present invention but not limiting the scope of the invention; although be explained in detail the present invention with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to technical scheme of the present invention or equivalent replacement, and not depart from essence and the scope of technical solution of the present invention.
Claims (10)
1. the Control protection processing method run of DC engineering no ground pole mode, is characterized in that: carry out Control protection by direct current station Ore-controlling Role, DC pole control system and DC protection system entirety;
Earthed switch chain condition in station is set to meet by force by described direct current station Ore-controlling Role, command unit to be carried out point earthed switch in described station, closes order and control;
The earth electrode connection status Rule of judgment of described direct current station Ore-controlling Role is set to: directly judged separately by converting plant in converting plant, cancelling the incidence relation dividing state with earthed switch in station, judging that the conditional force of earthed switch point state in converting plant station meets in Inverter Station by being used for;
Described DC pole control system is provided with bipolar synchronous solution/locking unit, bipolar current follows unit and bipolar jumping unit, bipolar synchronous solution/locking unit adopts synchronous solution/locking processing mode to carry out separating/locking command execution process, bipolar current is followed unit and is adopted bipolar current to follow processing mode and carry out earth current control, and bipolar jumping unit adopts bipolar jumping process to carry out bipolar locking process;
Described DC protection system carries out ground protection.
2. the Control protection processing method run of DC engineering according to claim 1 no ground pole mode, is characterized in that:
Described bipolar synchronous solution/locking unit is provided with first selector and second selector, and the output of command unit is connected with the input of pole one pole control system, the input of pole two pole control system respectively;
The output of described pole one pole control system is connected with the input of described first selector, described first selector is provided with the first output and the second output, first output of first selector is connected with the first input end of pole one valve group controller, 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 is connected with the feedback input end of described pole one pole control system, the feedback output end of described pole one pole control system is connected with the feedback input end of described pole one valve group controller, described pole one valve group controller comprises the low valve control of the high valve control in pole one and pole one, the high end valve group of the high valve control in described pole one and pole one is bi-directionally connected, the low end valve group of the low valve control in described pole one and pole one is bi-directionally connected,
The output of described pole two pole control system is connected with the input of described second selector, described second selector is provided with the first output and the second output, first output of second selector is connected with the input of pole two valve group controller, 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 is connected with the feedback input end of described pole two pole control system, the feedback output end of described pole two pole control system is connected with the feedback input end of described pole two valve group controller, described pole two valve group controller comprises the low valve control of the high valve control in pole two and pole two, the high end valve group of the high valve control in described pole two and pole two is bi-directionally connected, the low end valve group of the low valve control in described pole two and pole two is bi-directionally connected,
Described first selector is identical with described second selector, all with the mode of connection control word of DC fields for Rule of judgment;
When DC fields is in monopolar metallic return configuration mode, mode of connection control word is 0, the first output conducting of first selector, the first output conducting of second selector; When DC fields is in bipolar Ground return configuration mode, mode of connection control word is 1, the second output conducting of first selector, the second output conducting of second selector;
Described bipolar synchronous solution/locking unit carries out bipolar synchronous solution/locking process specifically:
Command unit issues solution/locking order to corresponding pole one pole control system, pole two pole control system, and first selector, second selector select signal output channels according to mode of connection control word;
When mode of connection control word is 0, solution/locking order that command unit issues by the first output of first selector conducting first selector inputs an extremely valve group controller, solution/locking order that command unit issues by the first output of second selector conducting second selector inputs extremely two valve group controllers, the high end valve group of pole one is controlled by the high valve control in pole one, the low end valve group corresponding execution solution/block action respectively of pole one is controlled by pole one low end valve group controller, the high end valve group of pole two is controlled by the high valve control in pole two, the low end valve group corresponding execution solution/block action respectively of pole two is controlled by pole two low end valve group controller,
When mode of connection control word is 1, second output of first selector conducting first selector, command unit is issued to bipolar solution/locking order and inputs to station Ore-controlling Role by the second output of second selector conducting second selector respectively, Ore-controlling Role of standing carries out station control to received bipolar solution/locking order and operates to obtain the control signal that arrives at a station, synchronous for station control signal corresponding feedback is respectively beamed back pole one pole control system by the feedback output end of Ore-controlling Role of standing, pole two pole control system, by pole one pole control system, feedback signal is issued pole one valve group controller by feedback input end again, by pole two pole control system, feedback signal is issued pole two valve group controller by feedback input end, the high end valve group of pole one is controlled by the high valve control in pole one, the low end valve group corresponding execution solution/block action respectively of pole one is controlled by pole one low end valve group controller, the high end valve group of pole two is controlled by the high valve control in pole two, the low end valve group corresponding execution solution/block action respectively of pole two is controlled by pole two low end valve group controller.
3. the Control protection processing method run of DC engineering according to claim 2 no ground pole mode, is characterized in that:
Described station Ore-controlling Role carries out station control to received bipolar solution/locking order and operates to obtain the control signal that arrives at a station, and carries out especially by such as under type:
When receive unblock valve group signal from pole one pole control system and unlock two valve group signals, receive unblock valve group signal from pole two pole control system and unlock two valve group signals time, proceed as follows: by the unblock valve group signal received from pole one pole control system with unlock two valve group signals and carry out logic OR operation and obtain pole one or processing signals; The unblock valve group signal received from pole two pole control system or unblock two valve group signals are carried out logic OR operation and obtains pole two or processing signals; Described pole one or processing signals and described pole two or processing signals are carried out logical AND to operate and to control signal as standing and feed back respectively simultaneously and beam back pole one pole control system and pole two pole control system;
When receiving locking valve group signal or locking two valve group signals from pole one pole control system, when receiving locking valve group signal or locking two valve group signals from pole two pole control system, proceed as follows: the locking valve group signal received from pole one pole control system and locking two valve group signals are carried out logic OR operation and obtain pole one or processing signals; The locking valve group signal received from pole two pole control system and locking two valve group signals are carried out logic OR operation and obtain pole two or processing signals; Described pole one or processing signals and described pole two or processing signals are carried out logic OR operate to control as standing signal simultaneously corresponding feedback beam back pole one pole control system and pole two pole control system.
4. the Control protection processing method run of DC engineering according to claim 3 no ground pole mode; it is characterized in that: described order unit is set to man-machine interface; the solution that man-machine interface issues/locking order transmits extremely a pole control system and pole two pole control system respectively by LAN net; carry out signal alternating transmission by control bus between pole one pole control system and station Ore-controlling Role, between pole two pole control system and station Ore-controlling Role, carry out signal alternating transmission by control bus.
5. the Control protection processing method run of DC engineering according to claim 4 no ground pole mode, is characterized in that:
Described bipolar current is followed processing unit and is provided with bipolar released state R-S latch,
The high end valve group arrange pole one and the firing pulse enable signal of low end valve group carry out logic OR operation and obtain pole one and to light a fire pulsed logic or signal, the high end valve group arrange pole two and the firing pulse enable signal of low end valve group carry out logic OR operation and obtain pole two firing pulse logic OR signal, lighted a fire pole one again 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 that monopolar metallic return unlocks, when bipolar released state signal is 1, represent that bipolar Ground return unlocks,
Described bipolar current follows process especially by such as under type realization:
Read the bipolar released state signal that R-S latch exports,
When bipolar released state signal is 0, be sent to valve group controller using the current-order calculated value of this pole as final current reference value;
When bipolar released state signal is 1, according to following concrete condition process:
1) calculated difference absolute value, specifically to pole received current reference value, does difference with the current-order calculated value of this pole, and difference is taken absolute value;
2) dead band is regulated to compare absolute difference and current reference value,
When absolute value is not more than adjustment dead band, be sent to valve group controller using the current-order calculated value of this pole as final current reference value;
When absolute value is greater than adjustment dead band, to pole received current reference value, compares with the current reference value of this pole and get little, using little current reference value as smaller value; When this pole is pole a period of time, be sent to valve group controller using above-mentioned smaller value as final current reference value; When this pole is pole two, and when generation current reference value is followed, deduct the result after 15A using above-mentioned smaller value and be sent to valve group controller as final current reference value.
6. the Control protection processing method run of DC engineering according to claim 5 no ground pole mode, is characterized in that: current reference value regulates the dead time to be 50A.
7. the Control protection processing method run of DC engineering according to claim 6 no ground pole mode, is characterized in that:
Described bipolar jumping unit carries out bipolar jumping process 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 trip signal carries out logic OR operation, obtains the emergency outage signal of this pole under bipolar released state respectively;
The emergency outage signal of this pole is sent to station Ore-controlling Role by control bus by pole one pole control system, pole two pole control system respectively;
To stand the emergency outage signal of Ore-controlling Role to received pole one, the emergency outage signal of pole two carries out logic OR operation and obtains or operate emergency outage signal, rectification side or will operate emergency outage signal and sends extremely a pole control system and pole two pole control system by control bus, pole one pole control system, pole two is controlled electrode systems and respectively emergency outage signal is sent an extremely valve group controller, pole two valve group controller performs emergency outage action, inverter side sends extremely a pole control system and pole two pole control system with block signal by control bus, pole one pole control system, pole two is controlled electrode systems and respectively block signal is sent an extremely valve group controller, pole two valve group controller performs block action.
8. the Control protection processing method run of DC engineering according to claim 7 no ground pole mode, is characterized in that:
The ground protection of described DC protection system is specifically:
In rectification side station, ground network overcurrent protection 76SG 1 section is set to bipolar balance movement request, and its definite value is 0.01p.u.;
Rectification side is provided with ground network overcurrent protection 76SG 4 sections in station, and definite value is 0.3p.u., time delay 350ms;
In rectification side station, grounding system protection 87GSP 1 section of time delay is 2s;
Rectification side is provided with grounding system protection 87GSP 2 sections, definite value 0.3p.u., time delay 500ms in station;
Ground electrode circuit overload protection 76EL 2 sections of definite values of inverter side are 0.15p.u., time delay 750ms.
9. the Control protection processing method run of DC engineering according to claim 8 no ground pole mode, is characterized in that:
The ground protection of described DC protection system also comprises, the grounding electrode electric current unbalance protection unit of locking rectification side and earth electrode over-current protecting unit.
10. the Control protection processing method run of DC engineering according to claim 9 no ground pole mode, is characterized in that:
The ground protection of described DC protection system also comprises, under the condition that the no ground pole of rectification side is run, by grounding electrode electric current IDEE1 and IDEE2 two Measurement channel fault-signal shieldings.
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| CN109738749A (en) * | 2019-01-04 | 2019-05-10 | 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 | A kind of DC transmission engineering DC filter primary circuit broken string is without stream detection method |
| CN110912088A (en) * | 2019-11-21 | 2020-03-24 | 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 |
| 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 |
| WO2021129828A1 (en) * | 2019-12-26 | 2021-07-01 | 南京南瑞继保电气有限公司 | Earth fault control method for valve region of ultra-high-voltage direct current low-voltage-end converter, and control device |
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