CN104007367B - Fault line selection method in high-voltage direct-current double-line parallel operation - Google Patents
Fault line selection method in high-voltage direct-current double-line parallel operation Download PDFInfo
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- CN104007367B CN104007367B CN201410266214.3A CN201410266214A CN104007367B CN 104007367 B CN104007367 B CN 104007367B CN 201410266214 A CN201410266214 A CN 201410266214A CN 104007367 B CN104007367 B CN 104007367B
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Abstract
The invention relates to a fault line selection method in high-voltage direct-current double-line parallel operation. The fault line selection method involves high-voltage direct-current transient-state fault line selection logic, rectification-side steady-state fault line selection logic and inversion-side steady-state fault line selection logic. A faulty line is determined through the high-voltage direct-current transient-state fault line selection logic by collecting the current of a direct-current line A and the current of a direct-current line B and receiving a transient-state quantity line protection motion signal. A faulty line is determined through the rectification-side steady-state fault line selection logic by collecting the current of the direct-current line A, the current of the direct-current line B and the direct-current line voltage UDL and receiving the transient-state quantity line protection motion signal. A faulty line is determined through the inversion-side steady-state fault line selection logic by collecting the direct-current line A, the current of the direct-current line B and the direct-current line voltage UDL. According to the fault line selection method in high-voltage direct-current double-line parallel operation, one line fault positioning device can be omitted in a high-voltage direct-current double-line parallel operation mode.
Description
Technical field
The invention belongs to direct current transportation and flexible direct-current transmission field, and in particular to during HVDC two-wire parallel running
The method of failure line selection, and relevant control protection device.
Background technology
Typically there are two current conversion stations in technical field of direct current power transmission, while two poles can be provided with, be referred to as pole one and pole
Two.The pole one at two stations forms 1 transmitting loop of DC line by a transmission line of electricity connection；The pole two at two stations is by another
One transmission line of electricity connection, forms 2 transmitting loop of DC line.
In this conventional DC transmission system, each pole configures a set of line fault positioner, when generation line
Positioning line fault failure can occur between certain two shaft tower of circuit exactly during the failure of road.Simultaneously because each pole only has one
Bar transmission line of electricity, therefore also can be it is clear which bar circuit there occurs failure.
But under conditions of special, the restriction of such as transmission line capability, some DC transmission systems are only designed or are put into operation
One pole valve group, and transmission line of electricity be then configured with two it is bipolar to be subsequently expanded into.Monopolar D. C transmission system now is past
It is past to adopt two DC line parallel running modes to reduce line loss.For this method of operation, if only configured a set of
Line fault positioner, then can only positioning line fault trouble point to two station distance and can not recognize which bar DC line send out
Earth fault is given birth to.In addition, DC line protection can only detect the failure of circuit at present, do not possess under two-wire parallel running mode
Failure line selection function.
In sum, also do not launch in existing technology to event under HVDC transmission system two-wire parallel running mode
The research of barrier route selection function.Certainly, which bar a set of line fault positioner can recognize is respectively configured to two DC lines
Circuit there occurs the distance of failure and failure.The present invention seeks to increase the event under this method of operation in direct current protecting main frame
Barrier route selection function, and one line fault positioner is only installed in high voltage dc bus and is shared for two lines road, thus may be used
To save a line fault positioner.
The content of the invention
The invention aims to avoid straight at each under HVDC transmission system two-wire parallel running mode
Flow Line is all installed line fault positioner and proposes fault-line selecting method.Its failure line selection logic is integrated in existing high pressure
In direct current protecting main frame, fault wire is determined by coordinating with a line fault positioner installed in high voltage dc bus
Road and fault distance, solve the problems, such as to need to install two line fault positioners under HVDC parallel running mode.
Technical solution of the present invention is：The method of failure line selection, its feature during HVDC transmission line two-wire parallel running
It is：Collection DC line A electric currents, DC line B electric currents, AC line voltage UDL, receive transient route protection action signal
With steady-state quantity route protection action signal；Through HVDC transient fault route selection logic, rectification side steady state fault route selection logic
And after the judgement of inverter side steady state fault route selection logic, determine faulty line；Three logical gates be output as or relation；Its
Mesohigh direct current transient fault route selection logic is by gathering DC line A electric currents, DC line B electric currents and the transient state for receiving
Measure route protection action signal to determine faulty line；Rectification side steady state fault route selection logic passes through to gather DC line A electric currents,
DC line B electric currents, AC line voltage UDLAnd the steady-state quantity route protection action signal for receiving is determining faulty line；
Inverter side steady state fault route selection logic is by gathering DC line A electric currents, DC line B electric currents, AC line voltage UDLCome true
Determine faulty line.
In such scheme：The HVDC transient fault route selection logic detection is then judged when meeting to following six conditions
This DC line there occurs earth fault：1. the change direction of this DC line electric current is for just；2. this DC line electricity
Stream is in time T02Interior amplitude of variation is more than amplitude of variation definite value；3. from time TsIt is front to current time, this DC line electricity
There is not negative value in the change direction of stream；4. the HVDC transient fault route selection logic of an other DC line does not meet
Condition 1., 2., 3.；5. it is above-mentioned 1., 2., 3., 4. four conditions all meet and the persistent period be not less than time T2；6. high straightening
Stream transient fault route selection logic receives transient route protection action signal.
In such scheme：The concrete detection method in the Rule of judgment 1. middle curent change direction is：Calculate its T0Time
The meansigma methodss of interior bar DC line electric current, then meansigma methodss are postponed into T0Time sends into subtractor as subtrahend.Then incite somebody to action this again
The value at bar DC line electric current current time sends into subtractor as minuend, and the result of subtractor output is designated as difference I△.It is whole
Side is flowed by difference I△Be sent directly into comparator respectively with definite value IsetWith-IsetIt is compared, and inverter side is by difference I△Take contrary
Be re-fed into after number comparator respectively with definite value IsetWith-IsetIt is compared.Rectification side works as I△More than sense of current definite value IsetAnd
Persistent period is more than time T1, then judge the change direction of this DC line electric current as just；Work as I△Less than sense of current definite value
IsetOpposite number and be sustained for longer than time T1, then judge the change direction of this DC line electric current as negative.Inversion
Work as I in side△Opposite number be more than sense of current definite value IsetAnd the persistent period is more than time T1, then judge this DC line electricity
The change direction of stream is for just；Work as I△Opposite number be less than sense of current definite value IsetOpposite number and when being sustained for longer than
Between T1, then judge the change direction of this DC line electric current as negative.
In such scheme：The concrete detection method of the Rule of judgment 2. middle curent change amplitude is：Current time this
The value of DC line electric current deducts time T02The value of this DC line electric current is the change of this DC line electric current before
Amount；The amplitude of variation of rectification side this DC line electric current is equal to the variable quantity of this DC line electric current；This is straight for inverter side
The amplitude of variation of Flow Line electric current is equal to the opposite number of the variable quantity of this DC line electric current.
In such scheme：The rectification side steady state fault route selection logic detection is then judged when all meeting to following six conditions
This DC line there occurs earth fault；This six conditions include：1. this DC line electric current deducts an other direct current
The difference of line current is more than difference definite value Idelta_set；2. AC line voltage U when power just sendDLLess than voltage definite value UsetOr
Opposite number-the U of AC line voltage during person's anti-power deliveryDLLess than voltage definite value Uset；3. this DC line electric current is more than electric current
Lower limit value Ilow_set；4. this DC line electric current is less than upper current limit definite value Iup_set；5. it is above-mentioned 1., 2., 3., 4. four
Condition all meets and the persistent period is not less than time T3；6. rectification side steady state fault route selection logic receives steady-state quantity route protection
Action signal.
In such scheme：The inverter side steady state fault route selection logic detection is then judged when all meeting to following four conditions
This DC line fault；This four conditions include：1. AC line voltage U when power just sendDLLess than voltage definite value UsetOr
Opposite number-the U of AC line voltage during anti-power deliveryDLLess than voltage definite value Uset；2. an other DC line electric current is more than electricity
Positive definite value I of streampos；3. this DC line electric current is less than electric current negative sense definite value Ineg；4. it is above-mentioned 1., 2., 3. three conditions are all
Meet and duration is not less than time T4。
Under HVDC two-wire parallel running mode, traditional fault location thought is in each DC line configuration
A set of line fault positioner.When a certain DC line fault occurs, corresponding line fault positioner provides failure
Distance, so both it is known that faulty line it will also be appreciated that fault distance.By in existing HVDC protected host
The middle failure line selection logic for increasing the present invention, it is possible to line fault positioner is arranged on high voltage dc bus and supplies two
DC line is shared, and when line fault occurs, failure line selection logic provides faulty line, and line fault positioner provides failure
Distance, therefore beneficial effects of the present invention can save a line fault positioner.
Description of the drawings
Fault-line selecting method logic diagram during Fig. 1 HVDC two-wire parallel running modes
Fig. 2 D.C. high voltage transmission two-wire parallel running modes, line current, line voltage distribution schematic diagram
Specific embodiment
Fault-line selecting method under HVDC transmission system two-wire parallel running mode involved in the present invention includes height
Straightening stream transient fault route selection logic, rectification side steady state fault route selection logic, three parts of inverter side steady state fault route selection logic.
The implementation method of wherein HVDC transient fault route selection logic is as follows：
(1) HVDC transient fault route selection logic its acquire this DC line electric current after, first calculate its T0When
The meansigma methodss of interior this DC line electric current, then meansigma methodss are postponed into T0Time sends into subtractor as subtrahend.Then again will
The value at this DC line electric current current time sends into subtractor as minuend, and the result of subtractor output is designated as difference I△。
(2) rectification side is by difference I△Be sent directly into comparator respectively with definite value IsetWith-IsetIt is compared, and inverter side will
Difference I△Be re-fed into after negating comparator respectively with definite value IsetWith-IsetIt is compared.Rectification side works as I△It is fixed more than the sense of current
Value IsetAnd the persistent period is more than time T1, then judge the change direction of this DC line electric current as just；Work as I△Less than electric current
Direction definite value IsetOpposite number and be sustained for longer than time T1, then judge the change direction of this DC line electric current
It is negative.Inverter side works as I△Opposite number be more than sense of current definite value IsetAnd the persistent period is more than time T1, then judge that this is straight
The change direction of Flow Line electric current is for just；Work as I△Opposite number be less than sense of current definite value IsetOpposite number and it is lasting when
Between be more than time T1, then judge the change direction of this DC line electric current as negative.
(3) amplitude of variation of this DC line electric current is secondly calculated, the current time value of this DC line electric current subtracts
Remove time T02The value of this DC line electric current is the variable quantity of this DC line electric current before.Rectification side this AC line
The amplitude of variation of road electric current is equal to the variable quantity of this DC line electric current.The amplitude of variation of inverter side this DC line electric current
Equal to the opposite number of the variable quantity of this DC line electric current.
(4) this DC line is then judged when HVDC transient fault route selection logic detection is met to following six conditions
There occurs earth fault：1. the change direction of this DC line electric current is for just；2. this DC line electric current is in time T02It is interior
Amplitude of variation be more than amplitude of variation definite value；3. from time TsIt is front to current time, the change direction of this DC line electric current
There is not negative value；4. 1. the HVDC transient fault route selection logic of an other DC line does not meet condition, 2.,
③；5. it is above-mentioned 1., 2., 3., 4. four conditions all meet and the persistent period be not less than time T2；6. HVDC transient fault
Route selection logic receives transient route protection action signal.
Rectification side steady state fault route selection logic detection then judges when all meeting to following six conditions that this DC line is sent out
Earth fault is given birth to.This six conditions include：1. this DC line electric current deducts the difference of an other DC line electric current
More than difference definite value Idelta_set；2. AC line voltage U when power just sendDLLess than voltage definite value UsetOr during anti-power delivery it is straight
Opposite number-the U of Flow Line voltageDLLess than voltage definite value Uset；3. this DC line electric current is more than lower current limit definite value
Ilow_set；4. this DC line electric current is less than upper current limit definite value Iup_set；5. it is above-mentioned 1., 2., 3., 4. four conditions are all full
Simultaneously the persistent period is not less than time T to foot3；6. rectification side steady state fault route selection logic receives steady-state quantity route protection action letter
Number.
Inverter side steady state fault route selection logic detection then judges when all meeting to following four conditions that this DC line is sent out
Earth fault failure is given birth to.This four conditions include：1. AC line voltage U when power just sendDLLess than voltage definite value UsetOr
Opposite number-the U of AC line voltage during anti-power deliveryDLLess than voltage definite value Uset；2. an other DC line electric current is more than electricity
Positive definite value I of streampos；3. this DC line electric current is less than electric current negative sense definite value Ineg；4. it is above-mentioned 1., 2., 3. three conditions are all
Meet and duration is not less than time T4。
The invention aims to a circuit event is saved under HVDC transmission system two-wire parallel running mode
The fault-line selecting method for hindering positioner and proposing.The side of failure line selection during HVDC two-wire parallel running as shown in Figure 1
Method is divided into HVDC transient fault route selection logic, and rectification side steady state fault route selection logic and inverter side steady state fault route selection are patrolled
Collect three parts.The logic of these three parts is as described below：
HVDC transient fault route selection logic its acquire this DC line electric current after, first calculate its T0In time
The meansigma methodss of this DC line electric current, then meansigma methodss are postponed into T0Time sends into subtractor as subtrahend.Then again by this
The value at DC line electric current current time sends into subtractor as minuend, and the result of subtractor output is designated as difference I△.Rectification
Side is by difference I△Be sent directly into comparator respectively with definite value IsetWith-IsetIt is compared, and inverter side is by difference I△After negating again
Send into comparator respectively with definite value IsetWith-IsetIt is compared.Rectification side works as I△More than sense of current definite value IsetAnd when continuing
Between be more than time T1, then judge the change direction of this DC line electric current as just；Work as I△Less than sense of current definite value IsetPhase
It is anti-to count and be sustained for longer than time T1, then judge the change direction of this DC line electric current as negative.Inverter side works as I△
Opposite number be more than sense of current definite value IsetAnd the persistent period is more than time T1, then judge the change of this DC line electric current
Change direction for just；Work as I△Opposite number be less than sense of current definite value IsetOpposite number and be sustained for longer than time T1, then
Judge the change direction of this DC line electric current as negative.Secondly the amplitude of variation of this DC line electric current is calculated, when current
The value of carving copy bar DC line electric current deducts time T02The value of this DC line electric current is this DC line electric current before
Variable quantity.The amplitude of variation of rectification side this DC line electric current is equal to the variable quantity of this DC line electric current.Inverter side
The amplitude of variation of this DC line electric current is equal to the opposite number of the variable quantity of this DC line electric current.
HVDC transient fault route selection logic detection then judges when meeting to following six conditions that this DC line is sent out
Earth fault is given birth to：1. the change direction of this DC line electric current is for just；2. this DC line electric current is in time T02Interior
Amplitude of variation is more than amplitude of variation definite value；3. from time TsIt is front to current time, the change direction of this DC line electric current does not have
Occur negative value；4. 1. the HVDC transient fault route selection logic of an other DC line does not meet condition, 2., 3.；
5. it is above-mentioned 1., 2., 3., 4. four conditions all meet and the persistent period be not less than time T2；6. HVDC transient fault choosing
Line logic receives transient route protection action signal.
Rectification side steady state fault route selection logic detection then judges when all meeting to following six conditions that this DC line is sent out
Earth fault is given birth to.This six conditions include：1. this DC line electric current deducts the difference of an other DC line electric current
More than difference definite value Idelta_set；2. AC line voltage U when power just sendDLLess than voltage definite value UsetOr during anti-power delivery it is straight
Opposite number-the U of Flow Line voltageDLLess than voltage definite value Uset；3. this DC line electric current is more than lower current limit definite value
Ilow_set；4. this DC line electric current is less than upper current limit definite value Iup_set；5. it is above-mentioned 1., 2., 3., 4. four conditions are all full
Simultaneously the persistent period is not less than time T to foot3；6. rectification side steady state fault route selection logic receives steady-state quantity route protection action letter
Number.
Inverter side steady state fault route selection logic detection then judges when all meeting to following four conditions that this DC line is sent out
Earth fault failure is given birth to.This four conditions include：1. AC line voltage U when power just sendDLLess than voltage definite value UsetOr
Opposite number-the U of AC line voltage during anti-power deliveryDLLess than voltage definite value Uset；2. an other DC line electric current is more than electricity
Positive definite value I of streampos；3. this DC line electric current is less than electric current negative sense definite value Ineg；4. it is above-mentioned 1., 2., 3. three conditions are all
Meet and duration is not less than time T4。
Illustrate the logic of HVDC two-wire parallel running failure line selection below as a example by judging DC line A failures.
Related HVDC parallel running state is defined as shown in Figure 2, because whatsoever method of operation HVDC
In transmission system, DC current can not possibly change direction, can only flow to IGCT from the station of IGCT plus earth earthed-cathode
Flow direction when standing, therefore defining normal operation along electric current is the positive direction of each current transformer.Define DC line pair
Positive direction of the voltage of the earth for voltage.Definition station 1 conveys power toward station 2 and just send for power, now the DC line at two stations
Voltage UDLAll be positive voltage, 1 stood for rectification side, stand 2 for inverter side.It is anti-power delivery that definition station 2 conveys power toward station 1, now
The AC line voltage U at two stationsDLAll be negative voltage, 1 stood for inverter side, stand 2 for rectification side.Define two DC line difference
For DC line A, DC line B.
HVDC transient fault route selection logic discrimination DC line A failures need the electric current I for gathering DC line ALA, directly
The malfunction of Flow Line B, and transient route protection action signal.Which acquires DC line A electric current ILAAfterwards, first count
Calculate its T0DC line A electric current I in timeLAMeansigma methodss, then meansigma methodss are postponed into T0Time sends into subtractor as subtrahend.So
Afterwards again by DC line A electric current ILAThe value at current time sends into subtractor as minuend, and it is poor that the result that subtractor is exported is designated as
Value I△.Rectification side is by difference I△Be sent directly into comparator respectively with definite value IsetWith-IsetIt is compared, and inverter side is by difference I△
Be re-fed into after negating comparator respectively with definite value IsetWith-IsetIt is compared.Rectification side works as I△More than sense of current definite value IsetAnd
And the persistent period is more than time T1, then judge the change direction of circuit A electric currents as just；Work as I△Less than sense of current definite value Iset's
Opposite number and it is sustained for longer than time T1, then judge the change direction of circuit A electric currents as negative.Inverter side works as I△It is contrary
Number is more than sense of current definite value IsetAnd the persistent period is more than time T1, then judge the change direction of circuit A electric currents as just；When
I△Opposite number be less than sense of current definite value IsetOpposite number and be sustained for longer than time T1, then circuit A electric currents are judged
Change direction be negative.
Secondly DC line A electric current I are calculatedLAAmplitude of variation, current time DC line A electric current ILAValue when deducting
Between T02The value of DC line A electric currents is DC line A electric current I beforeLAVariable quantity.Rectification side DC line A electric current ILA's
Amplitude of variation is equal to DC line A electric current ILAVariable quantity.Inverter side DC line A electric current ILAAmplitude of variation be equal to direct current
Circuit A electric current ILAVariable quantity opposite number.
After the calculating of curent change direction and amplitude of variation is completed, if the inspection of HVDC transient fault route selection logic
Measure when following six conditions meet and then judge that DC line A there occurs earth fault.1. DC line A electric currents ILAChange side
Xiang Weizheng；2. DC line A electric currents ILAIn time T02Interior amplitude of variation is more than amplitude of variation definite value；3. from time TsIt is front to work as
Front moment, DC line A electric current ILAChange direction there is not negative value；4. the HVDC transient fault choosing of DC line B
1. line logic does not meet condition, 2., 3.；5. it is above-mentioned 1., 2., 3., 4. four conditions all meet and the persistent period is not less than
Time T2；6. HVDC transient fault route selection logic receives transient route protection action signal.
Rectification side steady state fault route selection logic decision DC line A calculation of fault DC line A electric current ILADeduct AC line
Road B electric current ILBDifference.Direct current is then judged when rectification side steady state fault route selection logic detection is all met to following six conditions
Circuit A there occurs earth fault.This six conditions include：1. DC line A electric currents ILADeduct DC line B electric current ILBDifference
Value is more than difference definite value Idelta_set；2. AC line voltage U when power just sendDLLess than voltage definite value UsetOr during anti-power delivery
Opposite number-the U of AC line voltageDLLess than voltage definite value Uset；3. DC line A electric currents ILAMore than lower current limit definite value
Ilow_set；4. DC line A electric currents ILALess than upper current limit definite value Iup_set；5. it is above-mentioned 1., 2., 3., 4. four conditions all meet
And the persistent period is not less than time T3；6. rectification side steady state fault route selection logic receives steady-state quantity route protection action signal.
Inverter side steady state fault route selection logic detection then judges DC line A failures when all meeting to following four conditions.
Four conditions of DC line A failures include：1. AC line voltage U when power just sendDLLess than voltage definite value UsetOr power
Opposite number-the U of anti-AC line voltage when sendingDLLess than voltage definite value Uset；2. DC line B electric currents ILBIt is positive more than electric current fixed
Value Ipos；3. DC line A electric currents ILALess than electric current negative sense definite value Ineg, 4. it is above-mentioned 1., 2., 3. three conditions all meet and hold
The continuous time is not less than time T4。
Judge that the logical AND of DC line B failures differentiates that the logic of DC line A failures is just the same, simply will be described
DC line A and its electric current ILAChange DC line B and its electric current I intoLB, DC line B and its electric current IBChange into DC line A and
Its electric current ILA。
Above example technological thought only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme, the scope of the present invention is each fallen within
Within.
Claims (3)
1. during the parallel running of HVDC transmission line two-wire failure line selection method, it is characterized in that：DC line A is electric for collection
Stream, DC line B electric currents, AC line voltage UDL, receive transient route protection action signal and steady-state quantity route protection be dynamic
Make signal；Through HVDC transient fault route selection logic, rectification side steady state fault route selection logic and inverter side steady state fault
After the judgement of route selection logic, faulty line is determined；Three logical gates be output as or relation；Wherein HVDC transient fault
Route selection logic is by gathering DC line A electric currents, DC line B electric currents and the transient route protection action signal for receiving
To determine faulty line；Rectification side steady state fault route selection logic is by gathering DC line A electric currents, DC line B electric currents, direct current
Line voltage distribution UDLAnd the steady-state quantity route protection action signal for receiving is determining faulty line；Inverter side steady state fault route selection
Logic is by gathering DC line A electric currents, DC line B electric currents, AC line voltage UDLTo determine faulty line；
The HVDC transient fault route selection logic detection then judges when meeting to following six conditions that this DC line is sent out
Earth fault is given birth to：1. the change direction of this DC line electric current is for just；2. this DC line electric current is in time T02Interior
Amplitude of variation is more than amplitude of variation definite value；3. from time TsIt is front to current time, the change direction of this DC line electric current does not have
Occur negative value；4. 1. the HVDC transient fault route selection logic of an other DC line does not meet condition, 2., 3.；
5. it is above-mentioned 1., 2., 3., 4. four conditions all meet and the persistent period be not less than time T2；6. HVDC transient fault choosing
Line logic receives transient route protection action signal；
The rectification side steady state fault route selection logic detection then judges when all meeting to following six conditions that this DC line is sent out
Earth fault is given birth to；This six conditions include：1. this DC line electric current deducts the difference of an other DC line electric current
More than difference definite value Idelta_set；2. AC line voltage U when power just sendDLLess than voltage definite value UsetOr during anti-power delivery it is straight
Opposite number-the U of Flow Line voltageDLLess than voltage definite value Uset；3. this DC line electric current is more than lower current limit definite value
Ilow_set；4. this DC line electric current is less than upper current limit definite value Iup_set；5. it is above-mentioned 1., 2., 3., 4. four conditions are all full
Simultaneously the persistent period is not less than time T to foot3；6. rectification side steady state fault route selection logic receives steady-state quantity route protection action letter
Number；
The inverter side steady state fault route selection logic detection then judges this DC line event when all meeting to following four conditions
Barrier；This four conditions include：1. AC line voltage U when power just sendDLLess than voltage definite value UsetOr direct current during anti-power delivery
Opposite number-the U of line voltage distributionDLLess than voltage definite value Uset；2. an other DC line electric current is more than electric current forward direction definite value Ipos；
3. this DC line electric current is less than electric current negative sense definite value Ineg；4. it is above-mentioned 1., 2., 3. three conditions all meet and lasting
Time is not less than time T4。
2. during HVDC transmission line two-wire parallel running as claimed in claim 1 failure line selection method, it is characterized in that：
The concrete detection method in the Rule of judgment 1. middle curent change direction is：Calculate its T0This DC line electric current in time
Meansigma methodss, then meansigma methodss are postponed into T0Time sends into subtractor as subtrahend；Then when again will be this DC line electric current current
The value at quarter sends into subtractor as minuend, and the result of subtractor output is designated as difference I△；Rectification side is by difference I△It is sent directly into
Comparator respectively with definite value IsetWith-IsetIt is compared, and inverter side is by difference I△Comparator difference is re-fed into after taking opposite number
With definite value IsetWith-IsetIt is compared；Rectification side works as I△More than sense of current definite value IsetAnd the persistent period is more than time T1,
Then judge the change direction of this DC line electric current as just；Work as I△Less than sense of current definite value IsetOpposite number and continue
Time be more than time T1, then judge the change direction of this DC line electric current as negative；Inverter side works as I△Opposite number be more than
Sense of current definite value IsetAnd the persistent period is more than time T1, then judge the change direction of this DC line electric current as just；When
I△Opposite number be less than sense of current definite value IsetOpposite number and be sustained for longer than time T1, then judge this direct current
The change direction of line current is negative.
3. during HVDC transmission line two-wire parallel running as claimed in claim 1 failure line selection method, it is characterized in that：
The Rule of judgment of HVDC transient fault route selection logic 2. in, the concrete detection method of curent change amplitude is：Current time
The value of this DC line electric current deducts time T02The value of this DC line electric current is this DC line electric current before
Variable quantity；The amplitude of variation of rectification side this DC line electric current is equal to the variable quantity of this DC line electric current；Inverter side sheet
The amplitude of variation of bar DC line electric current is equal to the opposite number of the variable quantity of this DC line electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410266214.3A CN104007367B (en) | 2014-06-13 | 2014-06-13 | Fault line selection method in high-voltage direct-current double-line parallel operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410266214.3A CN104007367B (en) | 2014-06-13 | 2014-06-13 | Fault line selection method in high-voltage direct-current double-line parallel operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104007367A CN104007367A (en) | 2014-08-27 |
| CN104007367B true CN104007367B (en) | 2017-04-12 |
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| CN108548993A (en) * | 2018-06-08 | 2018-09-18 | 中国人民解放军海军工程设计研究院 | A kind of more cable parallel connection interlinkage fault-line selecting methods |
| CN109375054B (en) * | 2018-09-26 | 2021-04-20 | 南方电网科学研究院有限责任公司 | Fault line selection method of direct current transmission system |
| CN110927646B (en) * | 2019-11-05 | 2021-02-19 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for positioning abnormal fault of direct-current voltage measurement of high-voltage direct-current power transmission system |
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| CN102820643B (en) * | 2012-08-20 | 2014-09-17 | 山东大学 | High voltage direct current power transmission line protection method based on voltage and current mutation direction |
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