CN105039999A - Control method for alternate cathode protection of direct-current transmission grounding electrodes - Google Patents
Control method for alternate cathode protection of direct-current transmission grounding electrodes Download PDFInfo
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- CN105039999A CN105039999A CN201510514014.XA CN201510514014A CN105039999A CN 105039999 A CN105039999 A CN 105039999A CN 201510514014 A CN201510514014 A CN 201510514014A CN 105039999 A CN105039999 A CN 105039999A
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Abstract
The invention relates to a control method for alternate cathode protection of direct-current transmission grounding electrodes. Improvement is performed on the basis of a constant current control manner of direct-current transmission project, a first-electrode current value tiny deviation alternate change manner is adopted, alternate cathode protection of the sending end and receiving end grounding electrodes is achieved, corrosion losses of the grounding electrodes are reduced, the service life of the grounding electrodes is greatly prolonged, and the problem that the grounding electrodes are seriously corroded due to the unbalanced current and the like is solved.
Description
Technical field
The present invention relates to power domain, particularly relate to a kind of control method realized D. C. Electric transmission earthed pole galvanic protection.
Background technology
The HVDC transmission system put into operation in the world at present, mostly be two-terminal direct current transmission system, namely one end is converting plant, and one end is Inverter Station.Usually its operation scheme comprises bipolar operation, and monopolar ground return runs, and monopolar metallic return runs.During wherein monopolar metallic return runs, earthing pole plays preposition neutral point potential; And bipolar operation and monopolar ground return are when running, earthing pole not only plays preposition neutral point point position, but also provides path for galvanic current.
When earthing pole flows through electric current, electrode produces redox reaction; Positive ion in electrolytic solution shifts to negative electrode, combines at negative electrode and electronics and carries out reduction reaction; Negative ion shifts to anode, provide electronics at anode and carry out oxidizing reaction, water in the earth and salt are equivalent to electrolytic solution, when galvanic current is returned by the earth, anode produces oxidizing reaction, make the electrode generation electrocorrosion of anode, make earthing pole feed material dissolves, greatly reduce earthing pole work-ing life.
Galvanic protection is a kind of anti-corrosion measure being comparatively widely used in underground metalliferous component, is to apply relative to ground to be the voltage of negative polarity at protected component, makes it obtain electric current.In HVDC transmission system, usual converting plant adopts Given current controller, and during bipolar operation, pole 1 is identical with the given value of current value of pole 2.But in fact, due to the difference of Trigger Angle and device parameter, asymmetric electric current will be had to flow through earthing pole.The polarity polarity of earthing pole needs with system cloud gray model and changes, and he depends on earth current direction, i.e. the direction of the difference of bipolar current.Therefore, under the impact of asymmetric electric current, the earthing pole presenting anode will be corroded.The earthing pole corrosion that unbalanced current causes is one of important factor affecting the earthing pole life-span.
Summary of the invention
The object of the invention is for DC transmission engineering earthing pole corrosion-vulnerable, thus affect earthing pole this problem in work-ing life, provide a kind of control method realized D. C. Electric transmission earthed pole galvanic protection.
The invention provides a kind of control method realizing replacing D. C. Electric transmission earthed pole galvanic protection; described DC transmission system comprise by DC line connect two ends or two ends more than current conversion station; comprise bipolar unblock normally to run afterwards; one extremely given electric current is set to normally run set-point (I); another electrode current set-point is set to normal set-point of running and adds offset current (Δ I), and described offset current is alternatively set as plus deviation electric current and negative deviation electric current.
Preferably, realize control method D. C. Electric transmission earthed pole being replaced to galvanic protection, comprise the following steps:
S1, bipolar unblock normally run afterwards, and an extremely given electric current is set to normally run set-point, and another electrode current set-point is set to I+ Δ I, electric current is sent to make sending end earthing pole, receiving end earthing pole absorption current, the above earth potential of sending end earthing pole is negative, and the above earth potential of receiving end earthing pole is just;
The operation scheme of S2, maintenance step S1 is the first scheduled duration, is in galvanic protection to make sending end earthing pole;
One pole of S3, maintenance normal operating current value still keeps normal operating current, another electrode current set-point changes to I-Δ I, then sending end earthing pole absorption current, and receiving end earthing pole sends electric current, sending end earthing pole above earth potential is just, receiving end earthing pole above earth potential is negative;
The operation scheme of S4, maintenance step S1 is the second scheduled duration, is in galvanic protection to make receiving end earthing pole.
S5, step S1 to be circulated to step S4.
Preferably, realize control method D. C. Electric transmission earthed pole being replaced to galvanic protection, or comprise the following steps:
S1, bipolar unblock normally run afterwards, and an extremely given electric current is set to normally run set-point, and another electrode current set-point changes to I-Δ I, then sending end earthing pole absorption current, receiving end earthing pole sends electric current, and sending end earthing pole above earth potential is just, receiving end earthing pole above earth potential is negative;
The operation scheme of S2, maintenance step S1 is the first scheduled duration, is in galvanic protection to make receiving end earthing pole;
One pole of S3, maintenance normal operating current value still keeps normal operating current, another electrode current set-point is set to I+ Δ I, to make sending end earthing pole send electric current, and receiving end earthing pole absorption current, the above earth potential of sending end earthing pole is negative, and the above earth potential of receiving end earthing pole is just;
The operation scheme of S4, maintenance step 1 is the second scheduled duration, is in galvanic protection to make sending end earthing pole.
S5, step S1 to be circulated to step S4.
Preferably, described first scheduled duration is equal with described second scheduled duration.
Preferably, described first scheduled duration and described second scheduled duration are 24 hours.
Preferably, described normal operation set-point and described offset current are controlled by Given current controller device.
The present invention improves on the basis of DC transmission engineering Given current controller mode; adopt the mode that an electrode current value little deviation alternately changes; achieve sending end and receiving end earthing pole replaces galvanic protection; reduce the corrosive wear of earthing pole; substantially prolongs the work-ing life of earthing pole, solve the problem of the earthing pole seriously corroded that the problems such as unbalanced current are brought.
The present invention utilizes existing high voltage direct current transmission Given current controller pattern, does small adjustment, neither increase the input cost of Control protection system in this pattern, can greatly reduce earthing pole corrosive wear again, extends earthing pole work-ing life.
Accompanying drawing explanation
Fig. 1 is the control method schematic diagram that high voltage direct current transmission earthing pole replaces galvanic protection;
To be current deviation be Fig. 2+Δ I time the DC transmission system sense of current;
To be current deviation be Fig. 3-Δ I time the DC transmission system sense of current.
Embodiment
Below with reference to drawings and the specific embodiments, a kind of realization that the present invention proposes is described in detail to the control method of D. C. Electric transmission earthed pole galvanic protection.
As shown in Figure 1, the present invention improves on the basis of high voltage direct current transmission Given current controller device, the given value of current value of one pole (being pole 2 among the present embodiment) is normal current set-point Iref, i.e. DC engineering normal operating current value, the given value of current value of an other pole is I ± Δ I, every scheduled duration, curent change once.Thus grounding electrode electric current direction is changed in time, earthing pole above earth potential changes in time, thus realizes the alternately galvanic protection sending receiving end earthing pole.
As shown in Figures 2 and 3, the control method concrete steps realizing replacing high voltage direct current transmission earthing pole galvanic protection are:
S1, bipolar unblock normally run afterwards, and an extremely given electric current is set to normally run set-point, and another electrode current set-point is set to I+ Δ I, electric current is sent to make sending end earthing pole, receiving end earthing pole absorption current, the above earth potential of sending end earthing pole is negative, and the above earth potential of receiving end earthing pole is just;
The operation scheme of S2, maintenance step S1 is the first scheduled duration, is in galvanic protection to make sending end earthing pole;
One pole of S3, maintenance normal operating current value still keeps normal operating current, another electrode current set-point changes to I-Δ I, then sending end earthing pole absorption current, and receiving end earthing pole sends electric current, sending end earthing pole above earth potential is just, receiving end earthing pole above earth potential is negative;
The operation scheme of S4, maintenance step S1 is the second scheduled duration, is in galvanic protection to make receiving end earthing pole.
S5, step S1 to be circulated to step S4.
Be to be understood that and be, among another embodiment, realize control method D. C. Electric transmission earthed pole being replaced to galvanic protection, comprise the following steps:
S1, bipolar unblock normally run afterwards, and an extremely given electric current is set to normally run set-point, and another electrode current set-point changes to I-Δ I, then sending end earthing pole absorption current, receiving end earthing pole sends electric current, and sending end earthing pole above earth potential is just, receiving end earthing pole above earth potential is negative;
The operation scheme of S2, maintenance step S1 is the first scheduled duration, is in galvanic protection to make receiving end earthing pole;
One pole of S3, maintenance normal operating current value still keeps normal operating current, another electrode current set-point is set to I+ Δ I, to make sending end earthing pole send electric current, and receiving end earthing pole absorption current, the above earth potential of sending end earthing pole is negative, and the above earth potential of receiving end earthing pole is just;
The operation scheme of S4, maintenance step 1 is the second scheduled duration, is in galvanic protection to make sending end earthing pole.
S5, step S1 to be circulated to step S4.
So far, a kind of task of realizing replacing high voltage direct current transmission earthing pole the current deviation control method of galvanic protection that the present invention proposes all completes.
The present invention utilizes high voltage direct current transmission Given current controller device; the alternately galvanic protection sending receiving end earthing pole can be realized; reduce earthing pole corrosive wear, substantially prolongs the work-ing life of earthing pole, solve the problem of the earthing pole seriously corroded that the problems such as unbalanced current are brought.The present invention utilizes existing high voltage direct current transmission Given current controller pattern, does small adjustment, neither increase the input cost of Control protection system in this pattern, can greatly reduce earthing pole corrosive wear again, extends earthing pole work-ing life.This application possesses skills, and maturation, economic and reliable, realization are simple, the feature of excellent performance, can be applicable in high voltage direct current transmission Practical Project.
Claims (6)
1. one kind realizes control method D. C. Electric transmission earthed pole being replaced to galvanic protection; described DC transmission system comprise by DC line connect two ends or two ends more than current conversion station; it is characterized in that; comprise bipolar unblock normally to run afterwards; one extremely given electric current is set to normally run set-point (I); another electrode current set-point is set to normal set-point of running and adds offset current (Δ I), and described offset current is alternatively set as plus deviation electric current and negative deviation electric current.
2. realization according to claim 1 replaces the control method of galvanic protection to D. C. Electric transmission earthed pole, it is characterized in that, comprises the following steps:
S1, bipolar unblock normally run afterwards, and an extremely given electric current is set to normally run set-point, and another electrode current set-point is set to I+ △ I, electric current is sent to make sending end earthing pole, receiving end earthing pole absorption current, the above earth potential of sending end earthing pole is negative, and the above earth potential of receiving end earthing pole is just;
The operation scheme of S2, maintenance step S1 is the first scheduled duration, is in galvanic protection to make sending end earthing pole;
One pole of S3, maintenance normal operating current value still keeps normal operating current, another electrode current set-point changes to I-△ I, then sending end earthing pole absorption current, and receiving end earthing pole sends electric current, sending end earthing pole above earth potential is just, receiving end earthing pole above earth potential is negative;
The operation scheme of S4, maintenance step S1 is the second scheduled duration, is in galvanic protection to make receiving end earthing pole.
S5, step S1 to be circulated to step S4.
3. according to claim 1ly a kind ofly realize control method high voltage direct current transmission earthing pole being replaced to galvanic protection, it is characterized in that, comprise the following steps:
S1, bipolar unblock normally run afterwards, and an extremely given electric current is set to normally run set-point, and another electrode current set-point changes to I-△ I, then sending end earthing pole absorption current, receiving end earthing pole sends electric current, and sending end earthing pole above earth potential is just, receiving end earthing pole above earth potential is negative;
The operation scheme of S2, maintenance step S1 is the first scheduled duration, is in galvanic protection to make receiving end earthing pole;
One pole of S3, maintenance normal operating current value still keeps normal operating current, another electrode current set-point is set to I+ △ I, to make sending end earthing pole send electric current, and receiving end earthing pole absorption current, the above earth potential of sending end earthing pole is negative, and the above earth potential of receiving end earthing pole is just;
The operation scheme of S4, maintenance step 1 is the second scheduled duration, is in galvanic protection to make sending end earthing pole.
S5, step S1 to be circulated to step S4.
4. the realization according to Claims 2 or 3 replaces the control method of galvanic protection to D. C. Electric transmission earthed pole, it is characterized in that, described first scheduled duration is equal with described second scheduled duration.
5. the realization according to Claims 2 or 3 replaces the control method of galvanic protection to D. C. Electric transmission earthed pole, it is characterized in that, described first scheduled duration and described second scheduled duration are 24 hours.
6. realization according to claim 1 replaces the control method of galvanic protection to D. C. Electric transmission earthed pole, and described normal operation set-point and described offset current are controlled by Given current controller device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510514014.XA CN105039999B (en) | 2015-08-20 | 2015-08-20 | A kind of control method realized to D. C. Electric transmission earthed pole alternating cathodic protection |
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| CN201510514014.XA CN105039999B (en) | 2015-08-20 | 2015-08-20 | A kind of control method realized to D. C. Electric transmission earthed pole alternating cathodic protection |
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| CN105039999A true CN105039999A (en) | 2015-11-11 |
| CN105039999B CN105039999B (en) | 2018-03-16 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3769521A (en) * | 1972-10-05 | 1973-10-30 | Exxon Production Research Co | Impressed current cathodic protection system |
| CN85100861A (en) * | 1985-04-01 | 1986-08-20 | 北京钢铁学院 | Semi-lining, high quality, low energy consumption electric slag re-smelting of alloy |
| DE4000618A1 (en) * | 1989-01-27 | 1990-08-02 | Felten & Guilleaume Energie | Limiting device for cathodic corrosion protection systems - using low internal resistance earthing connecting for buried high voltage conduits with cathodic protection systems |
| CN203700526U (en) * | 2013-12-25 | 2014-07-09 | 佛山电力设计院有限公司 | Impressed current protection system |
| CN104362660A (en) * | 2014-10-11 | 2015-02-18 | 中国南方电网有限责任公司 | Double-pole operation method of high-voltage direct-current power transmission system in in-station grounding mode |
| CN104449560A (en) * | 2014-11-18 | 2015-03-25 | 国网河南省电力公司漯河供电公司 | Environment-friendly long-acting grounding device anticorrosive agent and preparation method of anticorrosive agent |
-
2015
- 2015-08-20 CN CN201510514014.XA patent/CN105039999B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3769521A (en) * | 1972-10-05 | 1973-10-30 | Exxon Production Research Co | Impressed current cathodic protection system |
| CN85100861A (en) * | 1985-04-01 | 1986-08-20 | 北京钢铁学院 | Semi-lining, high quality, low energy consumption electric slag re-smelting of alloy |
| DE4000618A1 (en) * | 1989-01-27 | 1990-08-02 | Felten & Guilleaume Energie | Limiting device for cathodic corrosion protection systems - using low internal resistance earthing connecting for buried high voltage conduits with cathodic protection systems |
| CN203700526U (en) * | 2013-12-25 | 2014-07-09 | 佛山电力设计院有限公司 | Impressed current protection system |
| CN104362660A (en) * | 2014-10-11 | 2015-02-18 | 中国南方电网有限责任公司 | Double-pole operation method of high-voltage direct-current power transmission system in in-station grounding mode |
| CN104449560A (en) * | 2014-11-18 | 2015-03-25 | 国网河南省电力公司漯河供电公司 | Environment-friendly long-acting grounding device anticorrosive agent and preparation method of anticorrosive agent |
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