CN109946569A - Method and device for detecting exit risk of direct current filter and direct current power transmission system - Google Patents
Method and device for detecting exit risk of direct current filter and direct current power transmission system Download PDFInfo
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- CN109946569A CN109946569A CN201910300336.2A CN201910300336A CN109946569A CN 109946569 A CN109946569 A CN 109946569A CN 201910300336 A CN201910300336 A CN 201910300336A CN 109946569 A CN109946569 A CN 109946569A
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Abstract
The invention discloses a method and equipment for detecting exit risk of a direct current filter and a direct current power transmission system, wherein the method comprises the following steps: detecting current flowing through the rest running direct current filters after the fault direct current filters which quit running appear in the direct current power transmission system; solving an effective value of the current, and comparing the effective value of the current with a preset current threshold; and when the effective value of the current is larger than the preset current threshold value, determining that the fault direct current filter has safety risk when the direct current is kept to normally operate. Therefore, after the fault direct current filter which quits from operation appears in the direct current power transmission system, the effective value of the current flowing through other normal direct current filters is obtained, and when the effective value of the current is overlarge, the fault direct current filter is considered to have safety risk when the direct current normally operates, so that a worker can conveniently make corresponding safety measures in time after referring to the detected system safety risk condition, and the power supply safety and reliability of the system are improved.
Description
Technical field
The present invention relates to direct current transportation field, exiting risk checking method, set more particularly to a kind of DC filter
Standby and DC transmission system.
Background technique
Currently, DC filter is widely used in DC transmission system, it is mainly used for filtering out converter station (comprising whole
Stream station and Inverter Station) commutation generate characteristic harmonics.Fig. 1 is please referred to, Fig. 1 is a kind of DC transmission system in the prior art
Structural schematic diagram.In Fig. 1, converting plant is set in feeder ear, Inverter Station is set at electricity consumption end, its working principle is that: AC power source
The alternating current of output is input in converting plant, and converting plant will export direct current after AC rectification, in order to which electric energy is with direct current
Form is transmitted in transmission line of electricity, and when DC power transmission to Inverter Station, Inverter Station will export alternating current after DC inverter, with
For power supply for electrical equipment.
During DC transmission system operation, it is relatively conventional event that DC filter, which is abnormal backed off after random operation,
Barrier.In the prior art, DC filter can still be kept usually after being abnormal direct current operate normally a period of time (such as 2 is small
When), then just it is latched direct current.But for different DC transmission systems, direct current continues to keep after DC filter is out of service
The safety of operation is different, if with security risk DC transmission system after DC filter exits direct current after continuation of insurance
Operation is held, then the Supply Security and reliability that will lead to DC transmission system reduce.
Therefore, how the skill that a kind of system risk detection method after DC filter is out of service is this field is provided
The current problem to be solved of art personnel.
Summary of the invention
Risk checking method, equipment and DC power transmission system are exited the object of the present invention is to provide a kind of DC filter
System can detect the security risk situation of the system after any DC filter is out of service, consequently facilitating staff is referring to
Corresponding safety measure is made in time after system safety hazards situation detected, and then improves the power supply peace of DC transmission system
Full property and reliability.
In order to solve the above technical problems, exiting risk checking method the present invention provides a kind of DC filter, comprising:
After occurring failure DC filter out of service in DC transmission system, detect remaining be currently running it is straight
The electric current flowed through in stream filter；
The virtual value of the electric current is sought, and the virtual value of the electric current is made comparisons with predetermined current threshold；
When the virtual value of the electric current is greater than the predetermined current threshold, determine that the failure DC filter is being kept
There are security risks when direct current operates normally.
It is preferably, described to exit risk checking method further include:
Detect the direct current that the control host that the change of current for controlling converter station in the DC transmission system operates is sampled
Whether current signal passes through low-pass filtering；
If not, it is determined that there are security risks when keeping direct current to operate normally for the failure DC filter.
Preferably, the control host institute that the detection is operated for controlling the change of current of converter station in the DC transmission system
Whether the DC current signal of sampling passes through low-pass filtering；If not, it is determined that the failure DC filter is keeping direct current just
Often there are the processes of security risk when operation, comprising:
Detecting the sampling front-end of control host that the change of current for controlling converter station in the DC transmission system operates is
It is no to be connected with low-pass filter；
Whether if not connected have low-pass filter, detecting in the plug-in of the control host includes sampled signal
Low-pass filtering program；If not, it is determined that there are security risks when keeping direct current to operate normally for the failure DC filter.
It is preferably, described to exit risk checking method further include:
Detecting for controlling the DC current signal that the protected host of the DC transmission system emergency shutdown is sampled is
It is no to pass through low-pass filtering；
If not, it is determined that there are security risks when keeping direct current to operate normally for the failure DC filter.
Preferably, described to detect the direct current sampled for controlling the protected host of the DC transmission system emergency shutdown
Whether current signal passes through low-pass filtering；If not, it is determined that the failure DC filter is deposited when keeping direct current to operate normally
In the process of security risk, comprising:
It is described straight from being used to control before occurring failure DC filter out of service in the DC transmission system
Flow the first dc current waveform that its recording module record is obtained in the protected host of transmission system emergency shutdown；
After occurring failure DC filter out of service in the DC transmission system, from the recording module
Obtain the second dc current waveform of its record；
First dc current waveform and second dc current waveform are subjected to wave through preset pattern comparison algorithm
Shape comparison, obtains the different wave shape value of the two；
When the different wave shape value is greater than default discrepancy threshold, determine that the failure DC filter is keeping direct current just
Often there are security risks when operation.
It is preferably, described to exit risk checking method further include:
When determining the failure DC filter, when keeping direct current to operate normally, there are when security risk, control alarm dress
It sets and sounds an alarm.
Preferably, the warning device is specially combined aural and visual alarm.
In order to solve the above technical problems, exiting risk supervision equipment, packet the present invention also provides a kind of DC filter
It includes:
Current detection means, after occurring failure DC filter out of service in DC transmission system, inspection
Survey the electric current flowed through in the DC filter that remaining is currently running；
Control device, for seeking the virtual value of the electric current, and by the virtual value and predetermined current threshold of the electric current
It makes comparisons；When the virtual value of the electric current is greater than the predetermined current threshold, determine that the failure DC filter is being kept
There are security risks when direct current operates normally.
It is preferably, described to exit risk supervision equipment further include:
Host Detection device is controlled, for detecting the change of current operation for controlling converter station in the DC transmission system
Whether the DC current signal that control host is sampled passes through low-pass filtering；If not, it is determined that the failure DC filter exists
There are security risks when direct current being kept to operate normally；
Protected host detection device, for detecting the protected host institute for controlling the DC transmission system emergency shutdown
Whether the DC current signal of sampling passes through low-pass filtering；If not, it is determined that the failure DC filter is keeping direct current just
Often there are security risks when operation.
In order to solve the above technical problems, the present invention also provides a kind of DC transmission system, including any of the above-described kind of direct current
Filter exits risk supervision equipment.
Risk checking method is exited the present invention provides a kind of DC filter, comprising: is gone out in DC transmission system
After existing failure DC filter out of service, the electric current flowed through in the DC filter that remaining is currently running is detected；It seeks
The virtual value of electric current, and the virtual value of electric current is made comparisons with predetermined current threshold；When the virtual value of electric current is greater than predetermined current
When threshold value, determining failure DC filter, there are security risks when keeping direct current to operate normally.
In view of in DC transmission system some failure DC filter it is out of service after, remaining can be currently running straight
The electric current that stream filter is flowed through impacts, so the application obtains the electricity flowed through in the DC filter that remaining is currently running
The virtual value of stream, and think that failure DC filter has peace when keeping direct current to operate normally when the virtual value of electric current is excessive
Full blast danger, consequently facilitating staff makes corresponding safety measure after with reference to system safety hazards situation detected in time,
And then improve the Supply Security and reliability of DC transmission system.
Risk supervision equipment and DC transmission system are exited the present invention also provides a kind of DC filter, is moved back with above-mentioned
Risk checking method beneficial effect having the same out.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of DC transmission system in the prior art；
Fig. 2 is a kind of flow chart for exiting risk checking method of DC filter provided in an embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of the DC side harmonics circulation path of DC transmission system provided in an embodiment of the present invention；
Fig. 4 is the signal that a kind of DC filter provided in an embodiment of the present invention exits rear DC side harmonics circulation path
Figure；
Fig. 5 is a kind of structural schematic diagram for exiting risk supervision equipment of DC filter provided by the invention.
Specific embodiment
What core of the invention was to provide a kind of DC filter exits risk checking method, equipment and DC power transmission system
System can detect the security risk situation of the system after any DC filter is out of service, consequently facilitating staff is referring to
Corresponding safety measure is made in time after system safety hazards situation detected, and then improves the power supply peace of DC transmission system
Full property and reliability.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Referring to figure 2., Fig. 2 is a kind of stream for exiting risk checking method of DC filter provided in an embodiment of the present invention
Cheng Tu.
The risk checking method that exits of the DC filter includes:
Step S1: after occurring failure DC filter out of service in DC transmission system, remaining is being detected
The electric current flowed through in the DC filter of operation.
Step S2: the virtual value of electric current is sought, and the virtual value of electric current is made comparisons with predetermined current threshold.
Step S3: when the virtual value of electric current is greater than predetermined current threshold, determine that failure DC filter is keeping direct current
There are security risks when normal operation.
Specifically, when DC filter operates normally first in analysis DC transmission system, DC side characteristic harmonics are (special
It levies in harmonic wave based on 12 subharmonic contents, for the embodiment of the present application for analyzing 12 subharmonic, other frequency analyses are former
Manage identical) circulation path.
Referring to figure 3., Fig. 3 is a kind of DC side harmonics circulation path of DC transmission system provided in an embodiment of the present invention
Schematic diagram.
The concrete analysis principle of DC side harmonics circulation path are as follows: the content of 12 subharmonic and side in analysis DC side electric current
To for rectifying side pole 1, it is known that the 12 subharmonic contents of A1IDCH, A1DCN, A1Z1T1 are roughly the same and are all positive, and
The 12 subharmonic contents of A1IDLH, A1IDLN are lower, it is possible to illustrate that 12 subharmonic for rectifying electric current in side pole 1 exist clockwise
It circulates between converter valve and DC filter.Similarly, rectify side pole 2, in inversion side pole 1 and inversion side pole 2 12 times of electric current it is humorous
Wave circulates between converter valve and DC filter clockwise, i.e. DC side harmonics circulation path curve as shown in Figure 3.
When pole a certain in DC transmission system DC filter it is out of service (i.e. a certain pole DC filter no longer with direct current
Have electrical link) after, the electric current that remaining DC filter being currently running flows through will appear certain variation.If in a certain pole direct current
After filter is out of service, remaining DC filter being currently running flow through electric current virtual value be more than certain threshold value (such as
100A), then illustrate there is larger impact to the safe operation of DC transmission system after DC filter is out of service；Otherwise, then it says
The safe operation of DC transmission system is influenced after bright DC filter is out of service little.
Next after a certain pole DC filter is out of service in analysis DC transmission system, remaining direct current being currently running
The specific situation of change of electric current is flowed through in filter.For DC filter to rectify side pole 1 is out of service, referring to figure 4.,
Fig. 4 is the schematic diagram that a kind of DC filter provided in an embodiment of the present invention exits rear DC side harmonics circulation path.
Make a concrete analysis of principle are as follows: according to the DC side harmonics circulation path of Fig. 3, can derive the direct current filter of rectification side pole 1
After wave device is out of service, 12 subharmonic that should flow through the DC filter of rectification side pole 1 can flow into remaining and be currently running
DC filter, thick straight line as shown in Figure 4, arrow direction represent circulating direction.It is circulated simultaneously according to the DC side harmonics of Fig. 3
Path is it is found that remaining DC filter being currently running is additionally flowed through when the DC filter for rectifying side pole 1 is not out of service
12 subharmonic, slice curve as shown in Figure 4.As it can be seen that the direct current of a certain pole of rectification side or inverter side of DC transmission system is filtered
When wave device is out of service, remaining DC filter being currently running flows through the virtual value of electric current and instantaneous value variable quantity depends on it
In the remaining DC filter being currently running the phasor of increased 12 subharmonic and original 12 subharmonic and.
Based on above-mentioned analysis as a result, failure DC filtering out of service can occur in DC transmission system in the application
After device, the electric current flowed through in the DC filter that remaining is currently running is detected.Then the virtual value of electric current is sought, and by electric current
Virtual value and predetermined current threshold (being rule of thumb arranged) make comparisons.When the virtual value of electric current is greater than predetermined current threshold,
Then determine that there are security risks when keeping direct current to operate normally for failure DC filter.At this time in order to guarantee DC transmission system
Safety, staff can directly control DC filter locking direct current, no longer holding direct current operate normally a period of time.
It should be noted that the default of the application sets in advance, it is only necessary to which setting is primary, unless according to practical feelings
Condition needs to modify, and does not otherwise need to reset.
In addition, it is contemplated that under different operating conditions the DC filter DC filter out of service that remaining is currently running shadow
Sound it is different, so the application can also analyze DC filter under different operating conditions it is out of service remaining is currently running it is straight
Flow filter influence, obtain worst operating condition (i.e. under this operating condition DC filter it is out of service after DC current 12
Subharmonic increase is the most obvious).
Risk checking method is exited the present invention provides a kind of DC filter, comprising: is gone out in DC transmission system
After existing failure DC filter out of service, the electric current flowed through in the DC filter that remaining is currently running is detected；It seeks
The virtual value of electric current, and the virtual value of electric current is made comparisons with predetermined current threshold；When the virtual value of electric current is greater than predetermined current
When threshold value, determining failure DC filter, there are security risks when keeping direct current to operate normally.
In view of in DC transmission system some failure DC filter it is out of service after, remaining can be currently running straight
The electric current that stream filter is flowed through impacts, so the application obtains the electricity flowed through in the DC filter that remaining is currently running
The virtual value of stream, and think that failure DC filter has peace when keeping direct current to operate normally when the virtual value of electric current is excessive
Full blast danger, consequently facilitating staff makes corresponding safety measure after with reference to system safety hazards situation detected in time,
And then improve the Supply Security and reliability of DC transmission system.
On the basis of the above embodiments:
As a kind of optionally embodiment, risk checking method is exited further include:
Detect the DC current that the control host that the change of current for controlling converter station in DC transmission system operates is sampled
Whether signal passes through low-pass filtering；
If not, it is determined that there are security risks when keeping direct current to operate normally for failure DC filter.
Further, it is known that the control host operated in DC transmission system comprising the change of current for controlling converter station, control
Host processed needs to sample the filtered DC current signal of DC filter in DC transmission system, if directly in control process
Stream filter is out of service, then controlling in the DC current signal of host sampling will increase 12 subharmonic.If control host is adopted
The DC current signal of sample passes through low-pass filtering, and increased 12 subharmonic can be filtered out in DC current signal, then will not be right
The subsequent control of control host impacts；Conversely, can then be impacted to the subsequent control of control host.
It, can be with after failure DC filter out of service occurs in DC transmission system in the application based on this
Whether the DC current signal that the control host in detection DC transmission system is sampled passes through low-pass filtering, if do not passed through
Low-pass filtering, the subsequent control of control host can be impacted by illustrating that DC filter is out of service, it is determined that failure direct current
There are security risks when keeping direct current to operate normally for filter.
As a kind of optionally embodiment, the control that the change of current for controlling converter station in DC transmission system operates is detected
Whether the DC current signal that host is sampled passes through low-pass filtering；If not, it is determined that failure DC filter is keeping direct current
There are the processes of security risk when normal operation, comprising:
Whether the sampling front-end for detecting the control host that the change of current for controlling converter station in DC transmission system operates connects
It is connected to low-pass filter；
Whether if not connected have low-pass filter, detecting in the plug-in of control host includes sampled signal low pass
Filter；If not, it is determined that there are security risks when keeping direct current to operate normally for failure DC filter.
Specifically, it is contemplated that there are two types of the DC current signals sampled at present to the control host in DC transmission system
Filtering mode: the first, low-pass filter is connected in the sampling front-end of control host；Second, by sampled signal low-pass filtering
The plug-in of program write-in control host.So whether the application passes through in the DC current signal that detection control host is sampled
When crossing low-pass filtering, whether the sampling front-end of detection control host first is connected with low-pass filter, if being connected with low pass filtered
Wave device, then DC filter is out of service to impact the subsequent control of control host；If not connected have low pass filtered
Wave device, then whether include sampled signal low-pass filtering program, if there is sampled signal if detecting in the plug-in of control host
Low-pass filtering program, then DC filter is out of service to impact the subsequent control of control host；If do not adopted
Sample low pass signal filter, the subsequent control of control host can be impacted by illustrating that DC filter is out of service, then really
Determining failure DC filter, there are security risks when keeping direct current to operate normally.
As a kind of optionally embodiment, risk checking method is exited further include:
Detection is for controlling whether the DC current signal that the protected host of DC transmission system emergency shutdown is sampled passes through
Cross low-pass filtering；
If not, it is determined that there are security risks when keeping direct current to operate normally for failure DC filter.
Further, it is known that include the protection master for controlling DC transmission system emergency shutdown in DC transmission system
Machine, protected host also need the filtered direct current of DC filter in sampling DC transmission system in protection control process
Current signal.Similarly, if DC filter is out of service, protected host sampling DC current signal in will increase 12 times it is humorous
Wave.If the DC current signal of protected host sampling passes through low-pass filtering, increased 12 subharmonic meeting in DC current signal
Be filtered out, then will not subsequent to protected host protection control impact；Conversely, then can be to the subsequent protection of protected host
Control impacts.
Based on this, the application, which can also detect the DC current signal that the protected host in DC transmission system is sampled, is
No to pass through low-pass filtering, if not passing through low-pass filtering, illustrating that DC filter is out of service can be subsequent to protected host
Protection control impacts, it is determined that there are security risks when keeping direct current to operate normally for failure DC filter.
As a kind of optionally embodiment, detection is sampled for controlling the protected host of DC transmission system emergency shutdown
DC current signal whether pass through low-pass filtering；If not, it is determined that failure DC filter is when keeping direct current to operate normally
There are the processes of security risk, comprising:
Before occurring failure DC filter out of service in DC transmission system, from for controlling DC power transmission system
The first dc current waveform of its recording module record is obtained in the protected host of system emergency shutdown；
After occurring failure DC filter out of service in DC transmission system, its note is obtained from recording module
Second dc current waveform of record；
First dc current waveform and the second dc current waveform are subjected to comparison of wave shape through preset pattern comparison algorithm, obtained
To the different wave shape value of the two；
When different wave shape value is greater than default discrepancy threshold, determine failure DC filter when keeping direct current to operate normally
There are security risks.
Specifically, it is contemplated that include recording module in the protected host of DC transmission system, recording module can recorde guarantor
The waveform of DC current signal that shield host is sampled, thus the application can occur in DC transmission system it is out of service
Before failure DC filter, the waveform for the DC current signal that protected host samples at this time is obtained (referred to as from recording module
First dc current waveform), after then occurring failure DC filter out of service in DC transmission system, from recording
The waveform (referred to as the second dc current waveform) for the DC current signal that protected host samples at this time is obtained in module.
If can recognize it is understood that the first dc current waveform and the second dc current waveform difference are smaller
The DC current signal sampled by protected host passes through low-pass filtering；If differed greatly, it may be considered that protected host institute
The DC current signal of sampling is without low-pass filtering.So the application utilizes graphic correlation algorithm, by the first DC current wave
Shape and the second dc current waveform carry out comparison of wave shape, the different wave shape value both obtained, then by different wave shape value and default
Discrepancy threshold is made comparisons, and when different wave shape value is greater than default discrepancy threshold, illustrates the DC current letter that protected host is sampled
Number without low-pass filtering, i.e., DC filter it is out of service can protection control subsequent to protected host impact, then really
Determining failure DC filter, there are security risks when keeping direct current to operate normally.
As a kind of optionally embodiment, risk checking method is exited further include:
When determining failure DC filter, when keeping direct current to operate normally, there are when security risk, control warning device hair
Alarm out.
Further, the application can also have safety when keeping direct current to operate normally determining failure DC filter
When risk, control warning device is sounded an alarm, so that staff's failure DC filter be reminded to continue that direct current is kept normally to transport
Guild makes DC transmission system, and there are security risks, in order to which staff makes corresponding safety measure in time.
As one kind, optionally embodiment, warning device are specially combined aural and visual alarm.
Specifically, the warning device of the application can be selected but is not limited only to combined aural and visual alarm (acoustical signal+optical signal), this
Application is not particularly limited herein.
Referring to figure 5., Fig. 5 is a kind of structural representation for exiting risk supervision equipment of DC filter provided by the invention
Figure.
The risk supervision equipment that exits of the DC filter includes:
Current detection means 1, after occurring failure DC filter out of service in DC transmission system, inspection
Survey the electric current flowed through in the DC filter that remaining is currently running；
Control device 2 is made comparisons for seeking the virtual value of electric current, and by the virtual value of electric current with predetermined current threshold；
When the virtual value of electric current is greater than predetermined current threshold, determine that failure DC filter has peace when keeping direct current to operate normally
Full blast danger.
As a kind of optionally embodiment, risk supervision equipment is exited further include:
Host Detection device is controlled, for detecting the control of the change of current operation for controlling converter station in DC transmission system
Whether the DC current signal that host is sampled passes through low-pass filtering；If not, it is determined that failure DC filter is keeping direct current
There are security risks when normal operation；
Protected host detection device, the protected host for detecting for controlling DC transmission system emergency shutdown are sampled
DC current signal whether pass through low-pass filtering；If not, it is determined that failure DC filter is when keeping direct current to operate normally
There are security risks.
The introduction provided by the invention for exiting risk supervision equipment please refers to the above-mentioned embodiment for exiting risk checking method,
Details are not described herein by the present invention.
The present invention also provides a kind of DC transmission system, risk supervision is exited including any of the above-described kind of DC filter
Equipment.
The introduction of DC transmission system provided by the invention please refers to the above-mentioned embodiment for exiting risk supervision equipment, this hair
It is bright that details are not described herein.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of DC filter exits risk checking method characterized by comprising
After occurring failure DC filter out of service in DC transmission system, remaining direct current filter being currently running is detected
The electric current flowed through in wave device；
The virtual value of the electric current is sought, and the virtual value of the electric current is made comparisons with predetermined current threshold；
When the virtual value of the electric current is greater than the predetermined current threshold, determine that the failure DC filter is keeping direct current
There are security risks when normal operation.
2. DC filter as described in claim 1 exits risk checking method, which is characterized in that described to exit risk inspection
Survey method further include:
Detect the DC current that the control host that the change of current for controlling converter station in the DC transmission system operates is sampled
Whether signal passes through low-pass filtering；
If not, it is determined that there are security risks when keeping direct current to operate normally for the failure DC filter.
3. DC filter as claimed in claim 2 exits risk checking method, which is characterized in that the detection is for controlling
The DC current signal that is sampled of control host of change of current operation of converter station in the DC transmission system is made whether through too low
Pass filter；If not, it is determined that there are the process of security risk, packets when keeping direct current to operate normally for the failure DC filter
It includes:
Whether the sampling front-end for detecting the control host that the change of current for controlling converter station in the DC transmission system operates connects
It is connected to low-pass filter；
Whether if not connected have low-pass filter, detecting in the plug-in of the control host includes sampled signal low pass
Filter；If not, it is determined that there are security risks when keeping direct current to operate normally for the failure DC filter.
4. DC filter as claimed in claim 2 exits risk checking method, which is characterized in that described to exit risk inspection
Survey method further include:
Detection is for controlling whether the DC current signal that the protected host of the DC transmission system emergency shutdown is sampled passes through
Cross low-pass filtering；
If not, it is determined that there are security risks when keeping direct current to operate normally for the failure DC filter.
5. DC filter as claimed in claim 4 exits risk checking method, which is characterized in that the detection is for controlling
Make whether the DC current signal that the protected host of the DC transmission system emergency shutdown is sampled passes through low-pass filtering；If
It is no, it is determined that there are the processes of security risk when keeping direct current to operate normally for the failure DC filter, comprising:
It is defeated from being used to control the direct current before occurring failure DC filter out of service in the DC transmission system
The first dc current waveform of its recording module record is obtained in the protected host of electric system emergency shutdown；
After occurring failure DC filter out of service in the DC transmission system, obtained from the recording module
Its second dc current waveform recorded；
First dc current waveform and second dc current waveform are subjected to waveform pair through preset pattern comparison algorithm
Than obtaining the different wave shape value of the two；
When the different wave shape value is greater than default discrepancy threshold, determine that the failure DC filter is keeping direct current normally to transport
There are security risks when row.
6. DC filter as described in any one in claim 1-5 exits risk checking method, which is characterized in that described to move back
Risk checking method out further include:
When determining the failure DC filter, when keeping direct current to operate normally, there are when security risk, control warning device hair
Alarm out.
7. DC filter as claimed in claim 6 exits risk checking method, which is characterized in that the warning device tool
Body is combined aural and visual alarm.
8. a kind of DC filter exits risk supervision equipment characterized by comprising
Current detection means detects it after occurring failure DC filter out of service in DC transmission system
The electric current flowed through in the remaining DC filter being currently running；
Control device makees ratio for seeking the virtual value of the electric current, and by the virtual value of the electric current and predetermined current threshold
Compared with；When the virtual value of the electric current is greater than the predetermined current threshold, determine that the failure DC filter is keeping direct current
There are security risks when normal operation.
9. DC filter as claimed in claim 8 exits risk supervision equipment, which is characterized in that described to exit risk inspection
Measurement equipment further include:
Host Detection device is controlled, for detecting the control of the change of current operation for controlling converter station in the DC transmission system
Whether the DC current signal that host is sampled passes through low-pass filtering；If not, it is determined that the failure DC filter is being kept
There are security risks when direct current operates normally；
Protected host detection device, the protected host for detecting for controlling the DC transmission system emergency shutdown are sampled
DC current signal whether pass through low-pass filtering；If not, it is determined that the failure DC filter is normally transported in holding direct current
There are security risks when row.
10. a kind of DC transmission system, which is characterized in that including such as the described in any item DC filters of claim 8-9
Exit risk supervision equipment.
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