CN105039999B - A kind of control method realized to D. C. Electric transmission earthed pole alternating cathodic protection - Google Patents
A kind of control method realized to D. C. Electric transmission earthed pole alternating cathodic protection Download PDFInfo
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- CN105039999B CN105039999B CN201510514014.XA CN201510514014A CN105039999B CN 105039999 B CN105039999 B CN 105039999B CN 201510514014 A CN201510514014 A CN 201510514014A CN 105039999 B CN105039999 B CN 105039999B
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Abstract
The present invention relates to a kind of control method realized to D. C. Electric transmission earthed pole cathodic protection; it is improved on the basis of DC transmission engineering Given current controller mode; by the way of an electrode current value little deviation alternately changes; realize sending end and replace cathodic protection with receiving end earthing pole; reduce the corrosion losses of earthing pole; the service life of earthing pole is substantially prolongs, solves the problems, such as the earthing pole seriously corroded that the problems such as out-of-balance current brings.
Description
Technical field
The present invention relates to power domain, more particularly to a kind of controlling party realized to D. C. Electric transmission earthed pole cathodic protection
Method.
Background technology
The HVDC transmission system to put into operation in the world at present, mostly two-terminal direct current transmission system, i.e. one end is converting plant,
One end is Inverter Station.Its usual method of operation includes bipolar operation, monopolar ground return operation, monopolar metallic return operation.Its
In middle monopolar metallic return operation, earthing pole plays preposition neutral point potential；And bipolar operation and monopolar ground return fortune
During row, earthing pole not only plays preposition neutral point point position, but also provides path for DC current.
When earthing pole flows through electric current, redox reaction is produced on electrode；Cation in electrolyte shifts to negative electrode,
Negative electrode and electronics with reference to and carry out reduction reaction；Anion shifts to anode, provides electronics in anode and carries out oxidation reaction, greatly
Water and salt in ground, when DC current is returned by the earth, produce oxidation reaction so that sun equivalent to electrolyte on anode
Galvano-cautery occurs for the electrode of pole so that earthing pole feed material dissolving, substantially reduces earthing pole service life.
Cathodic protection is a kind of relatively broad anti-corrosion measure for underground metalliferous component, is to apply phase by protection component
For the voltage that ground is negative polarity, it is set to obtain electric current.In HVDC transmission system, usual converting plant, which uses, determines electric current control
System, and the given value of current value of pole 1 and pole 2 is identical during bipolar operation.But in fact, due to the difference of Trigger Angle and device parameter,
There to be asymmetric electric current to flow through earthing pole.The polarity polarity of earthing pole needs and changed with system operation, and he depends on electricity in ground
Flow the direction in direction, the i.e. difference of bipolar current.Therefore, under the influence of asymmetric electric current, the earthing pole that anode is presented will be rotten
Erosion.Earthing pole corrosion is one of important factor for influenceing the earthing pole life-span caused by out-of-balance current.
The content of the invention
The purpose of the present invention is to be directed to DC transmission engineering earthing pole corrosion-vulnerable, so as to influence earthing pole service life this
A kind of one problem, there is provided control method realized to D. C. Electric transmission earthed pole cathodic protection.
The present invention provides a kind of control method realized to D. C. Electric transmission earthed pole alternating cathodic protection, the direct current transportation
System includes current conversion stations more than both ends or both ends by DC line connection, including normal operation after bipolar unblock, a pole
Given electric current is arranged to normal operation set-point (I), and another electrode current set-point is set to normal operation set-point biasing spill current
(Δ I), the offset current are alternatively set as positively biased spill current and negative bias spill current.
Preferably, the control method to D. C. Electric transmission earthed pole alternating cathodic protection, including following step are realized
Suddenly：
Normal operation after S1, bipolar unblock, an extremely given electric current are arranged to normal operation set-point, and another electrode current gives
Value is set to I+ Δ I, and to cause sending end earthing pole to send out electric current, receiving end earthing pole absorbs electric current, the above earth potential of sending end earthing pole
It is negative, the above earth potential of receiving end earthing pole is just；
S2, the holding step S1 method of operation are the first scheduled duration, to cause sending end earthing pole to be in cathodic protection；
S3, a pole of normal operating current value is kept to remain in that normal operating current, another electrode current set-point change
For I- Δ I, then sending end earthing pole absorption electric current, receiving end earthing pole submitting electric current, sending end earthing pole above earth potential are just, to be terminated
Earth polar above earth potential is negative；
S4, the holding step S3 method of operation are the second scheduled duration, to cause receiving end earthing pole to be in cathodic protection；
S5, step S1 to step S4 is circulated.
Preferably, realize to D. C. Electric transmission earthed pole alternating cathodic protection control method, or including with
Lower step：
Normal operation after S1, bipolar unblock, an extremely given electric current are arranged to normal operation set-point, and another electrode current gives
Value is changed to I- Δ I, then sending end earthing pole absorbs electric current, and receiving end earthing pole sends out electric current, sending end earthing pole above earth potential for just,
Receiving end earthing pole above earth potential is negative；
S2, the holding step S1 method of operation are the first scheduled duration, to cause receiving end earthing pole to be in cathodic protection；
S3, a pole of normal operating current value is kept to remain in that normal operating current, another electrode current set-point is set to I
+ Δ I, to cause sending end earthing pole to send out electric current, receiving end earthing pole absorbs electric current, the above earth potential of sending end earthing pole be it is negative, by
The above earth potential in earth polar is terminated as just；
S4, the holding step S3 method of operation are the second scheduled duration, to cause sending end earthing pole to be in cathodic protection；
S5, step S1 to step S4 is circulated.
Preferably, first scheduled duration and second scheduled duration are equal.
Preferably, first scheduled duration and second scheduled duration are 24 hours.
Preferably, the normal operation set-point and the offset current are controlled by Given current controller device
System.
The present invention is improved on the basis of DC transmission engineering Given current controller mode, small using an electrode current value
The mode that deviation alternately changes, realizes sending end and replaces cathodic protection with receiving end earthing pole, reduce the corrosion losses of earthing pole,
The service life of earthing pole is substantially prolongs, solves the problems, such as the earthing pole seriously corroded that the problems such as out-of-balance current brings.
The present invention utilizes existing D.C. high voltage transmission Given current controller pattern, makees minor adjustment in the pattern, neither increases
Add the input cost of Control protection system, earthing pole corrosion losses can be greatly reduced again, extend earthing pole service life.
Brief description of the drawings
Fig. 1 is the control method schematic diagram that D.C. high voltage transmission earthing pole replaces cathodic protection；
Fig. 2 be current deviation for+Δ I when the DC transmission system sense of current；
Fig. 3 be current deviation for-Δ I when the DC transmission system sense of current.
Embodiment
Below with reference to drawings and the specific embodiments, to a kind of realization proposed by the present invention to D. C. Electric transmission earthed pole negative electrode
The control method of protection is described in detail.
As shown in figure 1, the present invention is improved on the basis of D.C. high voltage transmission Given current controller device, a pole (this
Be pole 2 among embodiment) given value of current value be normal current set-point Iref, i.e. DC engineering normal operating current value, separately
The given value of current value of an outer pole is I ± Δ I, and every scheduled duration, curent change is once.So that grounding electrode electric current direction with
Time changes, and earthing pole above earth potential changes with the time, so as to realize the alternating cathodic protection for sending receiving end earthing pole.
As shown in Figures 2 and 3, the control method specific steps to the alternating cathodic protection of D.C. high voltage transmission earthing pole are realized
For：
Normal operation after S1, bipolar unblock, an extremely given electric current are arranged to normal operation set-point, and another electrode current gives
Value is set to I+ Δ I, and to cause sending end earthing pole to send out electric current, receiving end earthing pole absorbs electric current, the above earth potential of sending end earthing pole
It is negative, the above earth potential of receiving end earthing pole is just；
S2, the holding step S1 method of operation are the first scheduled duration, to cause sending end earthing pole to be in cathodic protection；
S3, a pole of normal operating current value is kept to remain in that normal operating current, another electrode current set-point change
For I- Δ I, then sending end earthing pole absorption electric current, receiving end earthing pole submitting electric current, sending end earthing pole above earth potential are just, to be terminated
Earth polar above earth potential is negative；
S4, the holding step S3 method of operation are the second scheduled duration, to cause receiving end earthing pole to be in cathodic protection；
S5, step S1 to step S4 is circulated.
It should be understood that among another embodiment, the control to D. C. Electric transmission earthed pole alternating cathodic protection is realized
Method, comprise the following steps：
Normal operation after S1, bipolar unblock, an extremely given electric current are arranged to normal operation set-point, and another electrode current gives
Value is changed to I- Δ I, then sending end earthing pole absorbs electric current, and receiving end earthing pole sends out electric current, sending end earthing pole above earth potential for just,
Receiving end earthing pole above earth potential is negative；
S2, the holding step S1 method of operation are the first scheduled duration, to cause receiving end earthing pole to be in cathodic protection；
S3, a pole of normal operating current value is kept to remain in that normal operating current, another electrode current set-point is set to I
+ Δ I, to cause sending end earthing pole to send out electric current, receiving end earthing pole absorbs electric current, the above earth potential of sending end earthing pole be it is negative, by
The above earth potential in earth polar is terminated as just；
S4, the holding step S3 method of operation are the second scheduled duration, to cause sending end earthing pole to be in cathodic protection；
S5, step S1 to step S4 is circulated.
So far, it is proposed by the present invention it is a kind of realize to D.C. high voltage transmission earthing pole alternating cathodic protection current deviation control
The task of method processed is fully completed.
The present invention utilizes D.C. high voltage transmission Given current controller device, it is possible to achieve send the alternating negative electrode of receiving end earthing pole to protect
Shield, reduce earthing pole corrosion losses, substantially prolongs the service life of earthing pole, solve what the problems such as out-of-balance current brought
The problem of earthing pole seriously corroded.The present invention utilizes existing D.C. high voltage transmission Given current controller pattern, makees in the pattern micro-
Small adjustment, neither increase the input cost of Control protection system, earthing pole corrosion losses can be greatly reduced again, extend earthing pole
Service life.The application with technology maturation, economic and reliable, realize the characteristics of simple, excellent performance, can be applied to HVDC
In transmission of electricity Practical Project.
Claims (6)
1. it is a kind of realize to D. C. Electric transmission earthed pole alternating cathodic protection control method, the DC transmission system include by
The current conversion station more than both ends or both ends of DC line connection, it is characterised in that including normal operation after bipolar unblock, a pole is given
Determine electric current and be arranged to normal operation set-point (I), another electrode current set-point is set to normal operation set-point biasing spill current (Δ
I), the offset current is alternatively set as positively biased spill current and negative bias spill current.
2. according to claim 1 realize the control method for replacing cathodic protection to D. C. Electric transmission earthed pole, its feature exists
In comprising the following steps：
Normal operation after S1, bipolar unblock, an extremely given electric current are arranged to normal operation set-point, and another electrode current set-point is set
For I+ Δ I, to cause sending end earthing pole to send out electric current, receiving end earthing pole absorbs electric current, the above earth potential of sending end earthing pole be it is negative,
The above earth potential of receiving end earthing pole is just；
S2, the holding step S1 method of operation are the first scheduled duration, to cause sending end earthing pole to be in cathodic protection；
S3, a pole of normal operating current value is kept to remain in that normal operating current, another electrode current set-point is changed to I-
Δ I, then sending end earthing pole absorption electric current, receiving end earthing pole submitting electric current, sending end earthing pole above earth potential are just receiving end earthing pole
Above earth potential is negative；
S4, the holding step S3 method of operation are the second scheduled duration, to cause receiving end earthing pole to be in cathodic protection；
S5, step S1 to step S4 is circulated.
3. a kind of control method realized to the alternating cathodic protection of D.C. high voltage transmission earthing pole according to claim 1,
It is characterised in that it includes following steps：
Normal operation after S1, bipolar unblock, an extremely given electric current are arranged to normal operation set-point, and another electrode current set-point is more
I- Δ I are changed to, then sending end earthing pole absorbs electric current, and receiving end earthing pole sends out electric current, and sending end earthing pole above earth potential is just receiving end
Earthing pole above earth potential is negative；
S2, the holding step S1 method of operation are the first scheduled duration, to cause receiving end earthing pole to be in cathodic protection；
S3, a pole of normal operating current value is kept to remain in that normal operating current, another electrode current set-point is set to I+ Δs
I, to cause sending end earthing pole to send out electric current, receiving end earthing pole absorbs electric current, and the above earth potential of sending end earthing pole is negative, is terminated
The above earth potential in earth polar is just；
S4, the holding step S3 method of operation are the second scheduled duration, to cause sending end earthing pole to be in cathodic protection；
S5, step S1 to step S4 is circulated.
4. the realization according to Claims 2 or 3 replaces the control method of cathodic protection, its feature to D. C. Electric transmission earthed pole
It is, first scheduled duration and second scheduled duration are equal.
5. the realization according to Claims 2 or 3 replaces the control method of cathodic protection, its feature to D. C. Electric transmission earthed pole
It is, first scheduled duration and second scheduled duration are 24 hours.
6. the control method according to claim 1 realized to D. C. Electric transmission earthed pole alternating cathodic protection, described normal
Operation set-point and the offset current are controlled by Given current controller device.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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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| CN105039999B true 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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