CN108321832A - A kind of control method and control device reducing equipment overcurrent operation risk - Google Patents
A kind of control method and control device reducing equipment overcurrent operation risk Download PDFInfo
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- CN108321832A CN108321832A CN201810124389.9A CN201810124389A CN108321832A CN 108321832 A CN108321832 A CN 108321832A CN 201810124389 A CN201810124389 A CN 201810124389A CN 108321832 A CN108321832 A CN 108321832A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention provides a kind of control methods and control device reducing equipment overcurrent operation risk, are related to transmission ＆ distribution electro-technical field, can solve the equipment overcurrent problem caused by DC current measures are extremely relatively low, prevent equipment from being damaged due to overcurrent.Wherein control method includes：Whether the measured value that real-time judge controls the current conversion station DC current of DC current is abnormal relatively low relative to actual value；If it is not, then terminating this process；If, then switch DC control system, and whether the measured value for judging to switch current conversion station DC current after DC control system is still abnormal relatively low relative to actual value, if still abnormal relatively low, then adjust the control input current of current DC current control system, if not abnormal relatively low, terminate this process.Above-mentioned control method is applied in HVDC transmission system.
Description
Technical field
The present invention relates to transmission ＆ distribution electro-technical field more particularly to a kind of control methods reducing equipment overcurrent operation risk
And control device.
Background technology
In high voltage dc transmission technology, direct current measuring devices are installed on DC transmission system DC pole busbar, double
At 12 pulse conversion valve group midpoints (if applicable) and neutral bus, for DC transmission system circuit control and protection provide it is defeated
Enter signal, is each indispensable core equipment of the DC transmission engineering change of current.
Direct current measuring devices are made of the part such as an acquisition elements, remote end module, combining unit and optical fiber, any
Element fault may cause the measurement of DC current abnormal, and during engineer application manufacturing process, quality control and
Each links such as installation test, which also easily leave, measures abnormal hidden danger.
If the measured value of DC current is extremely relatively low, the current conversion station for controlling DC current maintains always DC current specified
Value, and actual current value is persistently higher than DC current rated value, and equipment may be caused there are overcurrent risk, equipment for a long time at
It can be damaged in the operating status of overcurrent.
Invention content
The problems in for the above-mentioned prior art, the present invention provides a kind of controlling party reducing equipment overcurrent operation risk
Method and control device, to solve the equipment overcurrent problem caused by DC current measures are extremely relatively low in time, effectively
Prevent equipment from being damaged due to overcurrent.
In order to achieve the above objectives, the present invention adopts the following technical scheme that：
In a first aspect, the present invention's provides a kind of control method reducing equipment overcurrent operation risk, the controlling party
Method includes the following steps：
S1：Whether the measured value that real-time judge controls the current conversion station DC current of DC current is abnormal partially relative to actual value
It is low, if it is not, then terminating this process；If so, switching DC control system, and enter step S2.
S2：Judge switch DC control system after the current conversion station DC current measured value relative to actual value whether still
It is so abnormal relatively low, if it is not, then terminating this process；If so, entering step S3.
S3：The control input current I of current DC current control system is adjusted according to following formulain：
Iin=max (IdL0, 0.95 × IdV0)
Wherein, IdL0For the perunit value of the current conversion station direct current electrode current, IdV0For the current conversion station change of current current on valve side
Perunit value.
In the control method provided by the present invention for reducing equipment overcurrent operation risk, real-time judge controls direct current
Whether the measured value of the current conversion station DC current of stream is abnormal relatively low relative to actual value, once the measured value phase of judgement DC current
It is extremely relatively low for actual value, illustrate that currently running DC control system has DC current measurement input exception,
Then switch DC control system, i.e., currently running DC control system is switched to DC control system on duty, it will be current
DC control system on duty is switched to the DC control system of operation.It is straight to controlling again after switching DC control system
The measured value of the current conversion station DC current of galvanic electricity stream relative to actual value it is whether abnormal it is relatively low judged, if the survey of DC current
Magnitude is still abnormal relatively low relative to actual value, illustrates that the DC control system after switching still has DC current measurement input
Abnormal problem, then adjust the control input current of current DC current control system, make the measured value and reality of DC current
Value is consistent, and to reduce since DC current measures are extremely relatively low, caused DC current actual value is persistently higher than volume
The risk of definite value also just reduces the risk of equipment overcurrent, and equipment damage caused by avoiding thus improves direct current transportation
The operational reliability of system.
Second aspect, of the invention provides a kind of control device reducing equipment overcurrent operation risk, control dress
Set including：First judgment module, the measured value of the current conversion station DC current for real-time judge control DC current is relative to reality
Whether actual value is abnormal relatively low.The control module being connected with first judgment module, in the current conversion station DC current
When measured value is extremely relatively low relative to actual value, DC control system is switched over.Second to be connected with the control module
Judgment module, for after switching DC control system, judging the measured value of the current conversion station DC current relative to actual value
It is whether still abnormal relatively low.The adjustment module being connected with second judgment module, for the institute after switching DC control system
State the measured value of current conversion station DC current it is whether still abnormal relatively low relative to actual value when, it is current straight according to the adjustment of following formula
The control input current I of galvanic electricity flow control systemin：Iin=max (IdL0, 0.95 × IdV0), wherein IdL0It stands erectly for the change of current
Flow the perunit value of electrode current, IdV0For the perunit value of the current conversion station change of current current on valve side.
The advantageous effect of the control device for the reduction equipment overcurrent operation risk that the second aspect of the present invention is provided with
The advantageous effect of the control method for the reduction equipment overcurrent operation risk that the first aspect of the present invention is provided is identical, herein not
It repeats again.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
The basic procedure of the control method for the reduction equipment overcurrent operation risk that Fig. 1 is provided by the embodiment of the present invention
Figure；
The detailed process of the control method for the reduction equipment overcurrent operation risk that Fig. 2 is provided by the embodiment of the present invention
Figure；
The basic structure of the control device for the reduction equipment overcurrent operation risk that Fig. 3 is provided by the embodiment of the present invention
Figure.
Reference sign：
The first judgment modules of 1-；The first data capture units of 11-；
The first data processing units of 12-；13- first compares to determine unit；
2- control modules；The second judgment modules of 3-；
The second data capture units of 31-；The second data processing units of 32-；
33- second compares to determine unit；4- adjusts module.
Specific implementation mode
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, implement below in conjunction with the present invention
Attached drawing in example, technical scheme in the embodiment of the invention is clearly and completely described.Obviously, described embodiment
Only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, the common skill in this field
All other embodiment that art personnel are obtained under the premise of not making creative work belongs to the model that the present invention protects
It encloses.
Embodiment one
The present embodiment is by taking the conventional high-pressure DC transmission system based on thyristor commutation as an example, to the reduction equipment provided
The control method of overcurrent operation risk illustrates, and in HVDC transmission system, sending end (i.e. rectification side) is straight in order to control
Flow current terminal, receiving end (i.e. inverter side) direct current pressure side in order to control.
As depicted in figs. 1 and 2, the control method for the reduction equipment overcurrent operation risk that the present embodiment is provided include with
Lower step：
S1：The measured value of real-time judge rectification side current conversion station (controlling DC current) DC current is relative to actual value
It is whether abnormal relatively low, if it is not, then terminating this process；If so, switching DC control system, and enter step S2.
As a kind of possible realization method, above-mentioned steps S1 specifically may include following steps：
S11：Obtain the measured value of rectification side current conversion station direct current electrode current, the measured value and converter valve of neutral bus electric current
The measured value of side electric current.
S12：Calculate the perunit value I of the measured value of direct current electrode currentdL0, neutral bus electric current measured value perunit value
Idn0And the perunit value I of the measured value of change of current current on valve sidedV0, then calculate IdL0With Idn0Difference DELTA IdLAnd IdL0With IdV0's
Difference DELTA IdV。
In above-mentioned steps, the perunit value I of the measured value of direct current electrode currentdL0By the measured value of direct current electrode current divided by
The rated value of rectification side current conversion station DC current calculates.The perunit value I of the measured value of neutral bus electric currentdn0Pass through neutral bus
The measured value of electric current divided by the rated value of rectification side current conversion station DC current calculate.The perunit value of the measured value of change of current current on valve side
IdV0It is calculated by the measured value of change of current current on valve side divided by the rated value of rectification side current conversion station change of current current on valve side.
S13：Compare Δ IdLWith setting valve Δ I0Size and Δ IdVWith setting valve Δ I0Size；If Δ IdL>ΔI0
And/or Δ IdV>ΔI0, then judge that the measured value of rectification side current conversion station DC current is extremely relatively low relative to actual value, switching is straight
Flow control system, and enter step S2；Otherwise, it is determined that the measured value of rectification side current conversion station DC current is not different relative to actual value
It is often relatively low, terminate this process.
It should be noted that setting valve Δ I0It is missed according to the measurement of rectification side current conversion station DC current and change of current current on valve side
Difference determines.As a kind of possible design, setting valve Δ I0The 0.05 of the rated value of rectification side current conversion station DC current can be equal to
Times.
By analysis above it is found that the measured value when rectification side current conversion station DC current is extremely relatively low relative to actual value
When, illustrate the actual value overrate of rectification side current conversion station DC current, currently running DC control system, which exists, to be measured
Input abnormal problem.Since DC control system is redundancy, there are two sets of DC control systems, under normal conditions a set of direct current
Control system is run, and another set of DC control system is on duty, therefore in step S14, by switching DC control system, will be worked as
The DC control system of preceding operation is switched to DC control system on duty, and current DC control system on duty is switched to fortune
Capable DC control system can eliminate the rectification side change of current if the DC control system switched measures input normally
Stand DC current actual value overrate the problem of, to avoid equipment from being operated under overcurrent condition, also avoid
Thus caused equipment damage.
In embodiment, so-called " terminating this process " refer to complete the primary control for reducing equipment overcurrent risk into
Journey.Relative to the whether abnormal relatively low judgement of actual value be to the measured value of rectification side current conversion station DC current it is real-time, therefore
After " terminating this process ", the judgement of subsequent time can be carried out automatically, carry out the control for reducing equipment overcurrent risk next time
Process processed.
S2：Judge switch DC control system after rectification side current conversion station DC current measured value relative to actual value whether
Still abnormal relatively low, if it is not, then terminating this process；If so, entering step S3；
As a kind of possible realization method, above-mentioned steps S2 specifically includes following steps：
S21：Obtain the measured value of rectification side current conversion station direct current electrode current and converter valve side electricity after switching DC control system
The measured value of stream.
S22：Calculate the perunit value I ' of the measured value of direct current electrode currentdL0And the perunit value of the measured value of change of current current on valve side
I′dV0, then calculate I 'dL0With I 'dV0Difference DELTA I 'dV。
S23：Compare Δ I 'dVWith setting valve Δ I0Size；If Δ I 'dV>ΔI0, then judge after switching DC control system
The measured value of rectification side current conversion station DC current is extremely relatively low relative to actual value, enters step S3；Otherwise, it is determined that switching direct current
The measured value of rectification side current conversion station DC current is not abnormal relatively low relative to actual value after control system, terminates this process.
It should be noted that in above-mentioned steps S23, setting valve Δ I0It equally can be according to rectification side current conversion station DC current
It is determined with the measurement error of change of current current on valve side.Illustratively, setting valve Δ I0Rectification side current conversion station DC current can be equal to
0.05 times of rated value.
If S21~S23 through the above steps, rectification side current conversion station DC current after switching DC control system is determined
Measured value is still abnormal relatively low relative to actual value, then illustrates the actual value of rectification side current conversion station DC current still above specified
It is worth, the measurement input of currently running DC control system is also abnormal, and progress step S3 is needed to make currently running direct current
The measurement input of control system becomes normal.
S3：The control input current I of current DC current control system is adjusted according to following formulain：
Iin=max (IdL0, 0.95 × IdV0)
Wherein, IdL0For the perunit value of rectification side current conversion station direct current electrode current, IdV0For rectification side current conversion station converter valve side electricity
The perunit value of stream.
In the control method for the reduction equipment overcurrent operation risk that the present embodiment is provided, real-time judge rectification side is changed
Whether the measured value of stream station DC current is abnormal relatively low relative to actual value, once judging result is yes, illustrates currently running
There is DC current measurement input exception in DC control system, then switch DC control system.In switching DC control
After system, again to the measured value of rectification side current conversion station DC current relative to actual value it is whether abnormal it is relatively low judge, if
Judging result is still yes, illustrates that the DC control system after switching still has and measures the abnormal problem of input, then adjustment is current
The control input current of DC current control system makes the measured value of rectification side current conversion station DC current be consistent with actual value.From
And eliminate since DC current measures are extremely relatively low, caused DC current actual value is persistently higher than the wind of rated value
Danger, also just reduces the risk of equipment overcurrent, equipment damage caused by avoiding thus.
Embodiment two
A kind of control device reducing equipment overcurrent operation risk is present embodiments provided, as shown in figure 3, the control fills
Set the first judgment module 1, control module 2, the second judgment module 3 and adjustment module 4 including being sequentially connected.
Wherein, measured value phase of first judgment module 1 for the current conversion station DC current of real-time judge control DC current
It is whether abnormal relatively low for actual value.
Control module 2 is used for extremely inclined relative to actual value in the measured value of the current conversion station DC current of control DC current
When low, DC control system is switched over.
Second judgment module 3 is used for after switching DC control system, judges the current conversion station direct current for controlling DC current
Whether the measured value of stream is still abnormal relatively low relative to actual value.
Adjust the measured value of current conversion station DC current of the module 4 for controlling DC current after switching DC control system
Whether when still abnormal relatively low relative to actual value, the control that current DC current control system is adjusted according to following formula inputs
Electric current Iin：
Iin=max (IdL0, 0.95 × IdV0)
Wherein, IdL0The perunit value of the current conversion station direct current electrode current of DC current in order to control, IdV0DC current in order to control
The perunit value of current conversion station change of current current on valve side.
The reduction that the control device of reduction equipment overcurrent operation risk in the present embodiment is applied in embodiment one is set
In the control method of standby overcurrent operation risk, it can be effectively reduced since DC current measures are extremely relatively low, it is caused
DC current actual value persistently be higher than rated value risk, also just reduce the risk of equipment overcurrent, avoid and thus draw
The equipment damage risen.
Continuing with referring to Fig. 3, as a kind of possible design, the first judgment module 1 specifically includes first be sequentially connected
Data capture unit 11, the first data processing unit 12 and first compare to determine unit 13.Wherein, the first data capture unit
11 measured value of current conversion station direct current electrode current, the measured value of neutral bus electric current and the change of current for obtaining control DC current
The measured value of current on valve side.First data processing unit 12 calculates the perunit value I of the measured value of direct current electrode currentdL0, neutral bus
The perunit value I of the measured value of electric currentdn0And the perunit value I of the measured value of change of current current on valve sidedV0, then calculate IdL0With Idn0's
Difference DELTA IdLAnd IdL0With IdV0Difference DELTA IdV.First compares to determine unit 13 for comparing Δ IdLWith setting valve Δ I0It is big
Small and Δ IdVWith setting valve Δ I0Size；If Δ IdL>ΔI0And/or Δ IdV>ΔI0, then judge to control changing for DC current
The measured value of stream station DC current is extremely relatively low relative to actual value；Otherwise, it is determined that the current conversion station direct current of control DC current
The measured value of stream is not abnormal relatively low relative to actual value.Wherein, setting valve Δ I0According to the current conversion station direct current of control DC current
The measurement error of electric current and change of current current on valve side determines.
Comparing to determine unit 13 using the first data capture unit 11, the first data processing unit 12 and first can be real
Now to control DC current current conversion station DC current measured value relative to the whether abnormal relatively low real-time judge of actual value, from
And determine whether the current conversion station DC current of control DC current is higher than rated value, and then determine currently running DC control system
Whether the measurement input of system is abnormal.
Continuing with referring to Fig. 3, as a kind of possible design, the second judgment module 3 specifically includes second be sequentially connected
Data capture unit 31, the second data processing unit 32 and second compare to determine unit 33.Wherein, the second data capture unit
31 is electric for obtaining measured value, the neutral bus of the current conversion station direct current electrode current for controlling DC current after switching DC control system
The measured value of stream and the measured value of change of current current on valve side.Second data processing unit 32 is used to calculate the measurement of direct current electrode current
The perunit value I ' of valuedL0And the perunit value I ' of the measured value of change of current current on valve sidedV0, then calculate I 'dL0With I 'dV0Difference DELTA
I′dV.Second compares to determine unit 33 for comparing Δ I 'dVWith setting valve Δ I0Size；If Δ I 'dV>ΔI0, then judge to switch
The measured value that the current conversion station DC current of DC current is controlled after DC control system is extremely relatively low relative to actual value；Otherwise,
The measured value of the current conversion station DC current of control DC current is not abnormal relative to actual value after judgement switching DC control system
It is relatively low.
Comparing to determine unit 33 using the second data capture unit 31, the second data processing unit 32 and second can be real
It is now whether different relative to actual value to the measured value of the current conversion station DC current of control DC current after switching DC control system
Often relatively low real-time judge, so that it is determined that whether the current conversion station DC current of control DC current is high after switching DC control system
In rated value, and then determine whether the measurement input of currently running DC control system is abnormal.
The foregoing is merely the specific implementation modes of the present invention, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, all answer by the change or replacement that can be readily occurred in
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the scope of the claims
It is accurate.
Claims (7)
1. a kind of control method reducing equipment overcurrent operation risk, which is characterized in that the control method includes following step
Suddenly：
S1：Whether the measured value that real-time judge controls the current conversion station DC current of DC current is abnormal relatively low relative to actual value,
If it is not, then terminating this process；If so, switching DC control system, and enter step S2；
S2：Judge switch DC control system after the current conversion station DC current measured value it is whether still different relative to actual value
It is often relatively low, if it is not, then terminating this process；If so, entering step S3；
S3：The control input current I of current DC current control system is adjusted according to following formulain：
Iin=max (IdL0, 0.95 × IdV0)
Wherein, IdL0For the perunit value of the current conversion station direct current electrode current, IdV0For the perunit of the current conversion station change of current current on valve side
Value.
2. the control method according to claim 1 for reducing equipment overcurrent operation risk, which is characterized in that step S1 packets
It includes：
S11：Obtain the measured value of the current conversion station direct current electrode current, the measured value of neutral bus electric current and change of current current on valve side
Measured value；
S12：Calculate the perunit value I of the measured value of the direct current electrode currentdL0, the neutral bus electric current measured value perunit
Value Idn0And the perunit value I of the measured value of the change of current current on valve sidedV0, then calculate IdL0With Idn0Difference DELTA IdLAnd IdL0
With IdV0Difference DELTA IdV；
S13：Compare Δ IdLWith setting valve Δ I0Size and Δ IdVWith setting valve Δ I0Size；If Δ IdL>ΔI0And/or
ΔIdV>ΔI0, then judge that the measured value of the current conversion station DC current is extremely relatively low relative to actual value, switching DC control system
System, and enter step S2；Otherwise, it is determined that the measured value of the current conversion station DC current is relative to not abnormal relatively low, the knot of actual value
Shu Benci processes；
Wherein, the setting valve Δ I0It is determined according to the measurement error of the current conversion station DC current and change of current current on valve side.
3. the control method according to claim 1 for reducing equipment overcurrent operation risk, which is characterized in that step S2 packets
It includes：
S21：Obtain the survey of the measured value and change of current current on valve side of the current conversion station direct current electrode current after switching DC control system
Magnitude；
S22：Calculate the perunit value I ' of the measured value of the direct current electrode currentdL0And the mark of the measured value of the change of current current on valve side
One value I 'dV0, then calculate I 'dL0With I 'dV0Difference DELTA I 'dV；
S23：Compare Δ I 'dVWith setting valve Δ I0Size；If Δ I 'dV>ΔI0, then judge to switch described after DC control system
The measured value of current conversion station DC current is extremely relatively low relative to actual value, enters step S3；Otherwise, it is determined that switching DC control system
The measured value of the current conversion station DC current is not abnormal relatively low relative to actual value after system, terminates this process；
Wherein, the setting valve Δ I0It is determined according to the measurement error of the current conversion station DC current and change of current current on valve side.
4. the control method according to claim 2 or 3 for reducing equipment overcurrent operation risk, which is characterized in that described
Setting valve Δ I0Equal to 0.05 times of the rated value of the current conversion station DC current.
5. a kind of control device reducing equipment overcurrent operation risk, which is characterized in that the control device includes：
First judgment module, the measured value of the current conversion station DC current for real-time judge control DC current is relative to actual value
It is whether abnormal relatively low；
The control module being connected with first judgment module is used for the measured value in the current conversion station DC current relative to reality
When actual value is extremely relatively low, DC control system is switched over；
The second judgment module being connected with the control module, for after switching DC control system, judging the current conversion station
Whether the measured value of DC current is still abnormal relatively low relative to actual value；
The adjustment module being connected with second judgment module, for the current conversion station direct current after switching DC control system
When whether the measured value of stream is still abnormal relatively low relative to actual value, current DC current control system is adjusted according to following formula
Control input current Iin：
Iin=max (IdL0, 0.95 × IdV0)
Wherein, IdL0For the perunit value of the current conversion station direct current electrode current, IdV0For the perunit of the current conversion station change of current current on valve side
Value.
6. the control device according to claim 5 for reducing equipment overcurrent operation risk, which is characterized in that described first
Judgment module includes：
First data capture unit, the measurement of measured value, neutral bus electric current for obtaining the current conversion station direct current electrode current
The measured value of value and change of current current on valve side；
The first data processing unit being connected with first data capture unit, the measurement for calculating the direct current electrode current
The perunit value I of valuedL0, the neutral bus electric current measured value perunit value Idn0And the measured value of the change of current current on valve side
Perunit value IdV0, then calculate IdL0With Idn0Difference DELTA IdLAnd IdL0With IdV0Difference DELTA IdV；
First to be connected with first data processing unit compares to determine unit, for comparing Δ IdLWith setting valve Δ I0It is big
Small and Δ IdVWith setting valve Δ I0Size；If Δ IdL>ΔI0And/or Δ IdV>ΔI0, then judge the current conversion station direct current
The measured value of stream is extremely relatively low relative to actual value；Otherwise, it is determined that the measured value of the current conversion station DC current is relative to reality
Value is not abnormal relatively low；
Wherein, the setting valve Δ I0It is determined according to the measurement error of the current conversion station DC current and change of current current on valve side.
7. the control device according to claim 5 for reducing equipment overcurrent operation risk, which is characterized in that described second
Judgment module includes：
Second data capture unit, for obtains switch DC control system after the current conversion station direct current electrode current measured value,
The measured value of neutral bus electric current and the measured value of change of current current on valve side；
The second data processing unit being connected with second data capture unit, the measurement for calculating the direct current electrode current
The perunit value I ' of valuedL0And the perunit value I ' of the measured value of the change of current current on valve sidedV0, then calculate I 'dL0With I 'dV0Difference
It is worth Δ I 'dV；
Second to be connected with second data processing unit compares to determine unit, for comparing Δ I 'dVWith setting valve Δ I0's
Size；If Δ I 'dV>ΔI0, then judge switch DC control system after the current conversion station DC current measured value relative to reality
Actual value is extremely relatively low；Otherwise, it is determined that the measured value of the current conversion station DC current is relative to reality after switching DC control system
Value is not abnormal relatively low；
Wherein, the setting valve Δ I0It is determined according to the measurement error of the current conversion station DC current and change of current current on valve side.
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| CN201810124389.9A CN108321832A (en) | 2018-02-07 | 2018-02-07 | A kind of control method and control device reducing equipment overcurrent operation risk |
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| CN201810124389.9A CN108321832A (en) | 2018-02-07 | 2018-02-07 | A kind of control method and control device reducing equipment overcurrent operation risk |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541348A (en) * | 2018-11-26 | 2019-03-29 | 许继集团有限公司 | A kind of converter valve submodule block controller and driving malfunction method of discrimination |
| CN109946569A (en) * | 2019-04-15 | 2019-06-28 | 南方电网科学研究院有限责任公司 | DC filter exits risk checking method, equipment and DC transmission system |
| CN110456131A (en) * | 2019-07-25 | 2019-11-15 | 南方电网科学研究院有限责任公司 | A kind of DC voltage measurement exception localization method, device and equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107482667A (en) * | 2017-09-15 | 2017-12-15 | 南方电网科学研究院有限责任公司 | A kind of control method and control device for preventing equipment overvoltage |
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2018
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107482667A (en) * | 2017-09-15 | 2017-12-15 | 南方电网科学研究院有限责任公司 | A kind of control method and control device for preventing equipment overvoltage |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109541348A (en) * | 2018-11-26 | 2019-03-29 | 许继集团有限公司 | A kind of converter valve submodule block controller and driving malfunction method of discrimination |
| CN109946569A (en) * | 2019-04-15 | 2019-06-28 | 南方电网科学研究院有限责任公司 | DC filter exits risk checking method, equipment and DC transmission system |
| CN110456131A (en) * | 2019-07-25 | 2019-11-15 | 南方电网科学研究院有限责任公司 | A kind of DC voltage measurement exception localization method, device and equipment |
| CN110456131B (en) * | 2019-07-25 | 2021-06-22 | 南方电网科学研究院有限责任公司 | Method, device and equipment for positioning direct-current voltage measurement abnormity |
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