CN107359603B - Hvdc transmission line multistage distance protection method and system based on one-terminal data - Google Patents
Hvdc transmission line multistage distance protection method and system based on one-terminal data Download PDFInfo
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- CN107359603B CN107359603B CN201710794278.4A CN201710794278A CN107359603B CN 107359603 B CN107359603 B CN 107359603B CN 201710794278 A CN201710794278 A CN 201710794278A CN 107359603 B CN107359603 B CN 107359603B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- General Physics & Mathematics (AREA)
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- Emergency Protection Circuit Devices (AREA)
Abstract
The hvdc transmission line multistage distance protection method and system based on one-terminal data that the invention discloses a kind of; wherein; the realization of method includes: to acquire the voltage and current information of DC transmission system p, n two-wire line protective relaying device installation place, and be sent into the low-pass filtering treatment that each section of the two-wire line respective signal processing unit of protection carries out different cutoff frequencies；According to line parameter circuit value and each section of filtered measuring signal of protection, the offset voltage of each section of protection seting point of two-wire line is calculated separately；The ratio of measurement voltage, positive and negative by ratio differentiate hvdc transmission line internal fault external fault after calculating that each section of two-wire line protection offset voltage is corresponding with this section and filtering.Criterion of the present invention is simple, high reliablity, adjusting according to emulation is not depended on, can be very good to solve existing hvdc transmission line protection and lack a series of problems such as specific adjusting foundation, reliability be low.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System fields, more particularly, to a kind of high pressure based on one-terminal data
DC line multistage distance protection method and system.
Background technique
In recent years, high voltage direct current transmission project is in China's fast development.D.C. high voltage transmission big, line with transmission capacity
The advantages that path loss consumption is small and is easy to distributed energy access.However, since HVDC transmission system is commonly used in over long distances
Ground conveys electric energy, inevitably faces various atrocious weathers and natural environment.Therefore, event easily occurs for transmission line of electricity
Barrier.But existing HVDC transmission line, which is protected, has various deficiencies, such as traveling-wave protection sample rate is more demanding, theoretical
Imprecision is difficult to measure vulnerable to thunder and lightning interference, wave head, and differential under-voltage protection sensitivity is low, lacks adjusting foundation, under-voltage protection
Selectivity is poor, internal fault external fault cannot be distinguished, and current comparison pilot protection relies on Two-Terminal Electrical Quantities, therefore reliability is lower,
And movement speed is slower etc..
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of high voltage direct current based on one-terminal data
Route multistage distance protection method and system, thus solve the protection of existing hvdc transmission line it is existing lack clearly adjusting according to
According to, sample rate is high and a series of technical problems such as reliability is low.
To achieve the above object, according to one aspect of the present invention, a kind of high voltage direct current line based on one-terminal data is provided
Road multistage distance protection method, comprising:
S1, route occur short trouble when, acquire DC transmission system in the first protective relaying device of p polar curve road installation
The voltage and current information at place, and be sent into p polar curve road and carry out data processing in the corresponding signal processing unit of each section of protection, with
And the voltage and current information of n polar curve road the first protective relaying device installation place in DC transmission system is acquired, and be sent into the pole n
Data processing is carried out in the corresponding signal processing unit of each section of protection in route；
S2, filtered measuring signal is protected according to line parameter circuit value and each section, calculates separately each section of protection of two-wire line
Adjust the offset voltage of point；
S3: the ratio of measurement voltage after the offset voltage and the corresponding filtering of this section of each section of protection seting point of two-wire line is calculated
Value, positive and negative by ratio differentiate hvdc transmission line internal fault external fault.
Preferably, in step s 2, the offset voltage of each section of protection seting point for calculating separately two-wire line, specifically
Include:
The offset voltage calculation method of p polar curve road kth section protection seting point are as follows:
The offset voltage calculation method of n polar curve road kth section protection seting point are as follows:
Wherein, k is the integer more than or equal to 1, upck(t) offset voltage at the kth section protection seting point of p polar curve road is represented,
upmk(t) p polar curve road is represented through cutoff frequency fckMeasurement voltage after low-pass filtering, lkFor the adjusting distance of kth section protection, rs
For route unit length self-resistance, LsFor route unit length self-inductance, ipmkIt (t) is p polar curve road through cutoff frequency fckLow pass filtered
Measurement electric current after wave, rmThe mutual resistance of unit length, i between p polar curve road and n polar curve roadnmkIt (t) is n polar curve road through cutoff frequency
Rate fckMeasurement electric current after low-pass filtering, LmThe mutual inductance of unit length, u between p polar curve road and n polar curve roadnck(t) pole n is represented
Offset voltage at route kth section protection seting point, unmk(t) n polar curve road is represented through cutoff frequency fckMeasurement after low-pass filtering
Voltage.
Preferably, in step s3, the offset voltage for calculating each section of protection seting point of two-wire line is corresponding with the section
The ratio that voltage is measured after filtering, specifically includes:
ByK sections of the pole p ratio is calculated, byCalculate k sections of the pole n ratio.
Preferably, in step s3, described that hvdc transmission line internal fault external fault is differentiated by the positive and negative of ratio, specifically
Include:
If after failure, k sections of the pole p ratio Rpk(t) by just becoming negative, then it is determined as p polar curve road internal fault；
If after failure, k sections of the pole n ratio Rnk(t) by just becoming negative, then it is determined as n polar curve road internal fault；
If after failure, k sections of the pole p ratio Rpk(t) with k sections of the pole n ratio Rnk(t) become negative by positive, be then determined as p polar curve road
With n polar curve road interpolar internal fault；
If after failure, k sections of the pole p ratio Rpk(t) with k sections of the pole n ratio Rnk(t) it remains and is positive, be then determined as route
External fault.
It is another aspect of this invention to provide that providing a kind of applied to high straightening described in above-mentioned first aspect any one
The protection system of Flow Line multistage distance protection method, comprising: rectification side system 1, the first bus of p polar curve road 2, n polar curve road
First bus 3, the first protective relaying device of p polar curve road 4, the first protective relaying device of n polar curve road 5, p polar curve road 6, n polar curve road
7, the second protective relaying device of p polar curve road 8, the second protective relaying device of n polar curve road 9, the second bus of p polar curve road 10, n polar curve road
Second bus 11, inversion side system 12；
Wherein, the rectification side system 1 and 3 phase of the first bus of p polar curve road 2 and the first bus of n polar curve road
Even；The first bus of p polar curve road 2 is connected by p polar curve road 6 with the second bus of p polar curve road 10；The n polar curve
The first bus of road 3 is connected by n polar curve road 7 with the second bus of n polar curve road 11；The second bus of p polar curve road 10
And the second bus of n polar curve road 11 is connected with the inversion side system 12；The first protective relaying device of p polar curve road 4
It is mounted on 2 exit of the first bus of p polar curve road, the first protective relaying device of n polar curve road 5 is mounted on the n polar curve
3 exit of the first bus of road, the second protective relaying device of p polar curve road 8 are mounted on the outlet of the second bus of p polar curve road 10
Place, the second protective relaying device of n polar curve road 9 are mounted on 11 exit of the second bus of n polar curve road.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect: the present invention passes through the instantaneous value after carrying out different cutoff frequency low-pass waves using the single-ended measurement amount of hvdc transmission line
And line parameter circuit value, the offset voltage value at each section of protection seting point of two-wire line is calculated separately, two-wire line is further calculated
Each section of protection offset voltage is corresponding with this section filter after measurement voltage ratio, short time after taking failure as data window,
Using the positive and negative judgement route internal fault external fault of ratio, to sample rate require low, criterion is simple, quick action, high reliablity,
Adjusting foundation does not depend on emulation, can be very good to solve the specific adjusting foundation of existing hvdc transmission line protection shortage, adopt
The a series of problems such as sample rate is high, reliability is low.
Detailed description of the invention
Fig. 1 is a kind of hvdc transmission line multistage distance protection method based on one-terminal data provided in an embodiment of the present invention
Flow diagram；
Fig. 2 is the structural schematic diagram of HVDC transmission system provided in an embodiment of the present invention；
Fig. 3 is ± 800kv HVDC transmission system structural schematic diagram provided in an embodiment of the present invention；
Fig. 4 is that ± 800kv HVDC transmission system provided in an embodiment of the present invention is filled in the first relay protection of p polar curve road
It sets 4 positive outlets and ground short circuit failure (f occurs1) when, the change curve of " one section of the pole p ratio ", " two sections of the pole p ratio "；
Fig. 5 is that ± 800kv HVDC transmission system provided in an embodiment of the present invention is short in the polar curve great distance end p generation ground connection
Road failure (f2) when, the change curve of " one section of the pole p ratio ", " two sections of the pole p ratio "；
Fig. 6 is ± 800kv HVDC transmission system of the invention on p polar curve road, n polar curve road generation route distal end interpolar
Short trouble (f3) when, the variation of " one section of the pole p ratio ", " two sections of the pole p ratio ", " one section of the pole n ratio ", " two sections of the pole n ratio "
Curve；
Fig. 7 is ± 800kv HVDC transmission system of the invention in inversion side system generation three-phase symmetrical ground short circuit
Failure (f4) when, " one section of the pole p ratio ", " two sections of the pole p ratio ", " one section of the pole n ratio ", " two sections of the pole n ratio " change curve；
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which: 1 is rectification side-line
System, 2 be the first bus of p polar curve road, and 3 be the first bus of n polar curve road, and 4 be the first protective relaying device of p polar curve road, and 5 be n polar curve
The first protective relaying device of road, 6 be p polar curve road, and 7 be n polar curve road, and 8 be the second protective relaying device of p polar curve road, and 9 be n polar curve
The second protective relaying device of road, 10 be the second bus of p polar curve road, and 11 be the second bus of n polar curve road, and 12 be inversion side system.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The present invention protects existing a series of problems for existing hvdc transmission line, proposes a kind of suitable for high straightening
The multistage distance protection based on one-terminal data of Flow Line.According to the length of institute's protection circuit, corresponding protection number of segment is set.It should
Protection can differentiate hvdc transmission line internal fault external fault fast and reliablely, solve existing protection it is existing lack clearly adjusting according to
According to a series of problems such as, sample rate is high, reliability is low.
In embodiments of the present invention, after carrying out different cutoff frequency low-pass waves using the single-ended measurement amount of hvdc transmission line
Instantaneous value and line parameter circuit value, calculate separately the offset voltage value at each section of protection seting point of two-wire line, further calculate
The ratio of voltage is measured after each section of two-wire line protection offset voltage filtering corresponding with this section.Short time conduct after taking failure
Data window utilizes the positive and negative judgement route internal fault external fault of ratio.If after failure, " k sections of the pole p ratio " is then determined by just becoming negative
For p polar curve road internal fault；If after failure, " k sections of the pole n ratio " is then determined as n polar curve road internal fault by just becoming negative；If therefore
After barrier, " k sections of the pole p ratio " and " k sections of the pole n ratio " becomes negative by positive, then is determined as p, n polar curve road interpolar internal fault；If therefore
After barrier, " k sections of the pole p ratio " is remained with " k sections of the pole n ratio " and is positive, then is determined as route external fault.The present invention is to adopting
The requirement of sample rate is low, criterion is simple, quick action, high reliablity, adjusts according to emulation is not depended on, and can clearly determine high pressure
DC line internal fault external fault, solve the protection of existing hvdc transmission line lack specific adjusting it is high according to, sample rate, can
By the low equal a series of problems of property, there is universality.
It is that a kind of hvdc transmission line multisection type distance based on one-terminal data provided in an embodiment of the present invention is protected as shown in Figure 1
The flow diagram of maintaining method, in method shown in Fig. 1, comprising the following steps:
S1, route occur short trouble when, pass through the first relay of the first protective relaying device of p polar curve road 4 and n polar curve road
The fault initiating element of protective device 5 starts, and acquires p polar curve road the first protective relaying device installation place in DC transmission system
Voltage and current information, and be sent into p polar curve road and carry out data processing in the corresponding signal processing unit of each section of protection, and,
The voltage and current information of n polar curve road the first protective relaying device installation place in DC transmission system is acquired, and is sent into n polar curve road
In carry out data processing in each section of corresponding signal processing unit of protection；
For example, it is f that the signal of the pole p route protection k segment signal processing unit, which is carried out cutoff frequency,ckLow-pass filtering, filter
Measurement voltage and measurement electric current after wave are expressed as upmk(t) and ipmk(t), the pole n route protection k segment signal processing unit
It is f that signal, which carries out cutoff frequency,ckLow-pass filtering, filtered measurement voltage and measurement electric current be expressed as unmk(t) with
inmk(t)。
S2, filtered measuring signal is protected according to line parameter circuit value and each section, calculates separately each section of protection of two-wire line
Adjust the offset voltage of point；
S3: the ratio of measurement voltage after the offset voltage and the corresponding filtering of this section of each section of protection seting point of two-wire line is calculated
Value, positive and negative by ratio differentiate hvdc transmission line internal fault external fault.
In an optional embodiment, in step s 2, each section of protection seting point of two-wire line is calculated separately
Offset voltage specifically includes:
The offset voltage calculation method of p polar curve road kth section protection seting point are as follows:
The offset voltage calculation method of n polar curve road kth section protection seting point are as follows:
Wherein, k is the integer more than or equal to 1, upck(t) offset voltage at the kth section protection seting point of p polar curve road is represented,
upmk(t) p polar curve road is represented through cutoff frequency fckMeasurement voltage after low-pass filtering, lkFor the adjusting distance of kth section protection, rs
For route unit length self-resistance, LsFor route unit length self-inductance, ipmkIt (t) is p polar curve road through cutoff frequency fckLow pass filtered
Measurement electric current after wave, rmThe mutual resistance of unit length, i between p polar curve road and n polar curve roadnmkIt (t) is n polar curve road through cutoff frequency
Rate fckMeasurement electric current after low-pass filtering, LmThe mutual inductance of unit length, u between p polar curve road and n polar curve roadnck(t) pole n is represented
Offset voltage at route kth section protection seting point, unmk(t) n polar curve road is represented through cutoff frequency fckMeasurement after low-pass filtering
Voltage.
In an optional embodiment, in step s3, the compensation electricity of each section of protection seting point of two-wire line is calculated
The ratio that voltage is measured after pressure filtering corresponding with this section, specifically includes:
ByK sections of the pole p ratio is calculated, byCalculate k sections of the pole n ratio.
In the optional embodiment, in step s3, positive and negative by ratio differentiates hvdc transmission line area
Inside and outside failure, specifically includes:
If after failure, k sections of the pole p ratio Rpk(t) by just becoming negative, then it is determined as p polar curve road internal fault；
If after failure, k sections of the pole n ratio Rnk(t) by just becoming negative, then it is determined as n polar curve road internal fault；
If after failure, k sections of the pole p ratio Rpk(t) with k sections of the pole n ratio Rnk(t) become negative by positive, be then determined as p polar curve road
With n polar curve road interpolar internal fault；
If after failure, k sections of the pole p ratio Rpk(t) with k sections of the pole n ratio Rnk(t) it remains and is positive, be then determined as route
External fault.
It is illustrated in figure 2 provided in an embodiment of the present invention a kind of applied to the hvdc transmission line multisection type based on one-terminal data
The protection system of distance protecting method, the system structure include: rectification side system 1, the first bus of p polar curve road 2, n polar curve road the
One bus 3, the first protective relaying device of p polar curve road 4, the first protective relaying device of n polar curve road 5, p polar curve road 6, n polar curve road 7, p
The second protective relaying device of polar curve road 8, the second protective relaying device of n polar curve road 9, the second bus of p polar curve road 10, n polar curve road
Two buses 11, inversion side system 12, rectification side system 1 are connected with the first bus of p polar curve road 2, the first bus of n polar curve road 3, the pole p
The first bus of route 2 is connected by p polar curve road 6 with the second bus of p polar curve road 10, and the first bus of n polar curve road 5 passes through n polar curve road 7
It is connected with the second bus of n polar curve road 11, the second bus of p polar curve road 10, the second bus of n polar curve road 11 and 12 phase of inversion side system
Even, the first protective relaying device of p polar curve road 4 is mounted on 2 exit of the first bus of p polar curve road, the first relay protection of n polar curve road dress
It sets 5 and is mounted on 3 exit of the first bus of n polar curve road, the second protective relaying device of p polar curve road 8 is mounted on the second bus of p polar curve road
10 exits, the second protective relaying device of n polar curve road 9 are mounted on 11 exit of the second bus of n polar curve road.
The present invention carried out using the single-ended measurement amount of hvdc transmission line the instantaneous value after different cutoff frequency low-pass waves with
And line parameter circuit value, the offset voltage value at each section of protection seting point of two-wire line is calculated separately, it is each to further calculate two-wire line
The ratio of voltage is measured after the filtering corresponding with this section of section protection offset voltage.A short time after taking failure is as data window, benefit
With the positive and negative judgement route internal fault external fault of ratio.Hvdc transmission line multisection type distance proposed by the present invention based on one-terminal data
Protection requires simple low, criterion, quick action, high reliablity, adjusting according to emulation is not depended on sample rate, can be fine
Solution existing hvdc transmission line protection lack specific adjusting according to, a series of problems such as sample rate is high, reliability is low.
In order to the further description hvdc transmission line multisection type provided in an embodiment of the present invention based on one-terminal data away from
From guard method, now in conjunction with attached drawing and specific example, details are as follows:
Specific embodiment is illustrated by taking ± 800kv HVDC transmission system (line length 1400km) as an example, such as
Shown in Fig. 3, ± 800kv HVDC transmission system includes: rectification side system 1, the first bus of p polar curve road 2, n polar curve road first
Bus 3, the first protective relaying device of p polar curve road 4, the first protective relaying device of n polar curve road 5, p polar curve road 6, n polar curve road 7, the pole p
The second protective relaying device of route 8, the second protective relaying device of n polar curve road 9, the second bus of p polar curve road 10, n polar curve road second
Bus 11, inversion side system 12, rectification side system 1 are connected with the first bus of p polar curve road 2, the first bus of n polar curve road 3, p polar curve
The first bus of road 2 is connected by p polar curve road 6 with the second bus of p polar curve road 10, the first bus of n polar curve road 3 pass through n polar curve road 7 and
The second bus of n polar curve road 11 is connected, and the second bus of p polar curve road 10, the second bus of n polar curve road 11 are connected with inversion side system 12, p
The first protective relaying device of polar curve road 4 is mounted on 2 exit of the first bus of p polar curve road, the first protective relaying device of n polar curve road 5
It is mounted on 3 exit of the first bus of n polar curve road, the second protective relaying device of p polar curve road 8 is mounted on the second bus of p polar curve road 10
Exit, the second protective relaying device of n polar curve road 9 are mounted on 11 exit of the second bus of n polar curve road.
Using the above-mentioned hvdc transmission line multistage distance protection method based on one-terminal data, two sections of protections, i.e. k=are set
2, it follows the steps below to implement:
Step 1: when short trouble occurs for route, passing through the first protective relaying device of p polar curve road 4 and n polar curve road
The fault initiating element of first protective relaying device 5 starts, and the voltage and current of the protective relaying device installation place of acquisition is believed
Breath is sent into two sections of each polar curve road respective signal processing unit of protection and carries out low-pass filtering treatment.One section of the pole p route protection is believed
It is f that the signal of number processing unit, which carries out cutoff frequency,c1Low-pass filtering, filtered measurement voltage and measurement electric current respectively indicate
For upm1(t)、ipm1(t), it is f that the signal of two segment signal processing unit of the pole p route protection, which carries out cutoff frequency,c2Low-pass filtering,
Filtered measurement voltage and measurement electric current are expressed as upm2(t)、ipm2(t), one segment signal processing unit of the pole n route protection
Signal carry out cutoff frequency be fc1Low-pass filtering, filtered measurement voltage and measurement electric current be expressed as unm1(t)、
inm1(t), it is f that the signal of two segment signal processing unit of the pole n route protection, which carries out cutoff frequency,c2Low-pass filtering, filtered survey
Amount voltage and measurement electric current are expressed as unm2(t)、inm2(t)。
Step 2: according to line parameter circuit value and protection one section, two sections of filtered measuring signals, calculating separately two-wire line
Protect the offset voltage of one section, two sections adjusting point；
Step 3: being measured after calculating separately one section of two-wire line protection, two sections of respective section offset voltages filtering corresponding with this section
The ratio of voltage, i.e. " one section of the pole p ratio ", " two sections of the pole p ratio ", " one section of the pole n ratio ", " two sections of the pole n ratio ", pass through ratio
Positive and negative differentiate hvdc transmission line internal fault external fault.
In embodiments of the present invention, line parameter circuit value and protection one section, two sections of filtered measuring signal meters are utilized in step 2
The method for calculating one section of the protection of two-wire line, the offset voltage that two sections of adjustings are put are as follows:
The differential equation is replaced using difference equation in the present embodiment, fetches protection one section of adjusting distance l1=500km, protection
Two sections of adjusting distance l1=1300km, sampling interval Δ t=0.1ms, time window T=2ms, based on line parameter circuit value and protection one
Section, two sections of filtered measuring signals calculate the offset voltage that two-wire line protects one section, two sections adjusting point；
In the present embodiment, the offset voltage calculation method of one section of p polar curve road route protection adjusting point are as follows:
The offset voltage calculation method of two sections of the pole p route protection adjusting points are as follows:
The offset voltage calculation method of one section of the pole n route protection adjusting point are as follows:
The offset voltage calculation method of two sections of the pole n route protection adjusting points are as follows:
Wherein, upc1(i) representing the offset voltage i-th that one section of the pole p route protection is adjusted at point, (i is whole more than or equal to 2
Number) point instantaneous value, upm1(i) p polar curve road is represented through fc1Measurement voltage regulation i point instantaneous value after low-pass filtering, l1For one section of protection
Adjusting distance, rsFor route unit length self-resistance, LsFor route unit length self-inductance, ipm1It (i) is p polar curve road through fc1
Measurement electric current i-th instantaneous value, i after low-pass filteringpm1It (i-1) is (i-1)-th instantaneous value, Δ t is sampling interval, rmFor the pole p
The mutual resistance of unit length, i between route and n polar curve roadnm1It (i) is n polar curve road through fc1I-th point of measurement electric current after low-pass filtering
Instantaneous value, inm1It (i-1) is (i-1)-th instantaneous value, LmThe mutual inductance of unit length, u between p polar curve road and n polar curve roadpc2(i)
For i-th instantaneous value of offset voltage at two sections of the pole p route protection adjusting points, upm2It (i) is p polar curve road through fc2After low-pass filtering
Measurement voltage regulation i point instantaneous value, l2For two sections of adjusting distance of protection, ipm2It (i) is p polar curve road through fc2After low-pass filtering
Measure electric current instantaneous value, i at i-thpm2It (i-1) is (i-1)-th instantaneous value, inm2It (i) is n polar curve road through fc2Survey after low-pass filtering
Measure electric current instantaneous value, i at i-thnm2It (i-1) is (i-1)-th instantaneous value, unc1(i) it represents at one section of adjusting point of the pole n route protection
I-th instantaneous value of offset voltage, unm1(i) n polar curve road is represented through fc1Measurement voltage regulation i point instantaneous value after low-pass filtering, unc2
(i) i-th instantaneous value of offset voltage at two sections of the pole n route protection adjusting points, u are representednm2(i) n polar curve road is represented through fc2Low pass
Filtered measurement voltage regulation i point instantaneous value.
In embodiments of the present invention, " one section of the pole p ratio ", " two sections of the pole p ratio ", " one section of the pole n ratio ", " n in step 3
The calculation method method of two sections of pole ratio " are as follows:
Wherein, Rp1It (i) is i-th instantaneous value of " one section of the pole p ratio ", Rp2It (i) is i-th wink of " two sections of the pole p ratio "
Duration, Rn1It (i) is i-th instantaneous value of " one section of the pole n ratio ", Rn2It (i) is i-th instantaneous value of " two sections of the pole n ratio ".
In embodiments of the present invention, internal fault external fault sentences method for distinguishing in step 4 are as follows:
If after failure,OrIt sets up, is then determined as p polar curve
Road internal fault；
If after failure,OrIt sets up, is then determined as n polar curve
Road internal fault；
If after failure, (1), (2) are set up simultaneously, then it is determined as interpolar failure inside two-wire line；
If after failure, (1), (2) are invalid, then it is determined as route external fault.
In the present embodiment, ground short circuit failure (Fig. 3 occurs for the positive outlet of setting the first protective relaying device of p polar curve road 4
Middle f1Point), " one section of the pole p ratio ", " two sections of the pole p ratio " are as shown in figure 4, this up-to-date style (1) is set up, therefore is determined as in p polar curve road
Portion's failure.
In the present embodiment, ground short circuit failure (f in Fig. 3 occurs for setting p polar curve great distance end2Point), " one section of the pole p ratio
Value ", " two sections of the pole p ratio " are as shown in figure 5, this up-to-date style (1) is set up, therefore is determined as p polar curve road internal fault.
In the present embodiment, intereelectrode short-circuit failure (f in Fig. 3 occurs for setting two-wire line distal end3Point), " one section of the pole p ratio
Value ", " two sections of the pole p ratio ", " one section of the pole n ratio ", " two sections of the pole n ratio " as shown in fig. 6, this up-to-date style (1), (2) are set up simultaneously,
Therefore it is determined as line-internal interpolar failure；
In the present embodiment, three-phase symmetrical ground short circuit failure (f in Fig. 3 occurs for setting inversion side system4Point), " pole p one
Section ratio ", " two sections of the pole p ratio ", " one section of the pole n ratio ", " two sections of the pole n ratio " as shown in fig. 7, at this time (1), (2) not at
It is vertical, then it is determined as route external fault.
Referring to Fig. 4, Fig. 5, Fig. 6 and Fig. 7, Fig. 4 is ± 800kv HVDC transmission system of the invention on p polar curve road the
Ground short circuit failure (f occurs for the positive outlet of one protective relaying device 41) when, " one section of the pole p ratio ", " two sections of the pole p ratio " variation
Curve；Fig. 5 is ± 800kv HVDC transmission system of the invention in the polar curve great distance end p generation ground short circuit failure (f2) when,
" one section of the pole p ratio ", " two sections of the pole p ratio " change curve；Fig. 6 is ± 800kv HVDC transmission system of the invention in the pole p
Intereelectrode short-circuit failure (f in route distal end occurs for route, n polar curve road3) when, " one section of the pole p ratio ", " two sections of the pole p ratio ", " pole n one
Section ratio ", " two sections of the pole n ratio " change curve；Fig. 7 is ± 800kv HVDC transmission system of the invention in inversion side-line
Three-phase symmetrical ground short circuit failure (f occurs for system4) when, " one section of the pole p ratio ", " two sections of the pole p ratio ", " one section of the pole n ratio ", " n
Two sections of pole ratio " change curve；As can be seen that the high straightening provided in an embodiment of the present invention based on one-terminal data from Fig. 4-Fig. 7
Flow Line multistage distance protection method can effectively differentiate failure inside and outside route.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (5)
1. a kind of hvdc transmission line multistage distance protection method based on one-terminal data characterized by comprising
S1, when short trouble occurs for route, acquire p polar curve road the first protective relaying device installation place in DC transmission system
Voltage and current information, and be sent into p polar curve road and be filtered in the corresponding signal processing unit of each section of protection, and,
The voltage and current information of n polar curve road the first protective relaying device installation place in DC transmission system is acquired, and is sent into n polar curve road
In be filtered in each section of corresponding signal processing unit of protection；
S2, filtered measuring signal is protected according to line parameter circuit value and each section, calculates separately each section of protection seting of two-wire line
The offset voltage of point；
S3: the ratio of measurement voltage after the offset voltage filtering corresponding with this section of each section of protection seting point of two-wire line is calculated, is led to
It crosses the positive and negative of ratio and differentiates hvdc transmission line internal fault external fault.
2. described to calculate separately each of two-wire line the method according to claim 1, wherein in step s 2
The offset voltage of section protection seting point, specifically includes:
The offset voltage calculation method of p polar curve road kth section protection seting point are as follows:
The offset voltage calculation method of n polar curve road kth section protection seting point are as follows:
Wherein, k is the integer more than or equal to 1, upck(t) offset voltage at the kth section protection seting point of p polar curve road, u are representedpmk
(t) p polar curve road is represented through cutoff frequency fckMeasurement voltage after low-pass filtering, lkFor the adjusting distance of kth section protection, rsFor line
Road unit length self-resistance, LsFor route unit length self-inductance, ipmkIt (t) is p polar curve road through cutoff frequency fckAfter low-pass filtering
Measurement electric current, rmThe mutual resistance of unit length, i between p polar curve road and n polar curve roadnmkIt (t) is n polar curve road through cutoff frequency fck
Measurement electric current after low-pass filtering, LmThe mutual inductance of unit length, u between p polar curve road and n polar curve roadnck(t) n polar curve road is represented
Offset voltage at kth section protection seting point, unmk(t) n polar curve road is represented through cutoff frequency fckMeasurement electricity after low-pass filtering
Pressure.
3. according to the method described in claim 2, it is characterized in that, in step s3, described each section of calculating two-wire line is protected
The ratio that voltage is measured after the filtering corresponding with this section of the offset voltage of adjusting point, specifically includes:
ByK sections of the pole p ratio is calculated, byCalculate k sections of the pole n ratio.
It is described to be differentiated by the positive and negative of ratio 4. according to the method described in claim 3, it is characterized in that, in step s3
Hvdc transmission line internal fault external fault, specifically includes:
If after failure, k sections of the pole p ratio Rpk(t) by just becoming negative, then it is determined as p polar curve road internal fault；
If after failure, k sections of the pole n ratio Rnk(t) by just becoming negative, then it is determined as n polar curve road internal fault；
If after failure, k sections of the pole p ratio Rpk(t) with k sections of the pole n ratio Rnk(t) become negative by positive, be then determined as p polar curve road and the pole n
Route interpolar internal fault；
If after failure, k sections of the pole p ratio Rpk(t) with k sections of the pole n ratio Rnk(t) it remains and is positive, be then determined as outside route
Failure.
5. a kind of applied to hvdc transmission line multistage distance protection method described in 1 to 4 any one of the claims
Protection system characterized by comprising rectification side system (1), the first bus of p polar curve road (2), the first bus of n polar curve road
(3), the first protective relaying device of p polar curve road (4), the first protective relaying device of n polar curve road (5), p polar curve road (6), n polar curve road
(7), the second protective relaying device of p polar curve road (8), the second protective relaying device of n polar curve road (9), the second bus of p polar curve road
(10), the second bus of n polar curve road (11) and inversion side system (12)；
Wherein, the rectification side system (1) and the first bus of p polar curve road (2) and the first bus of n polar curve road (3)
It is connected；The first bus of p polar curve road (2) is connected by p polar curve road (6) with the second bus of p polar curve road (10)；Institute
The first bus of n polar curve road (3) is stated to be connected by n polar curve road (7) with the second bus of n polar curve road (11)；The p polar curve
The second bus of road (10) and the second bus of n polar curve road (11) are connected with the inversion side system (12)；P polar curve road
First protective relaying device (4) is mounted on p polar curve road the first bus (2) exit, the first relay protection of n polar curve road
Device (5) is mounted on n polar curve road the first bus (3) exit, the second protective relaying device of p polar curve road (8) installation
In p polar curve road the second bus (10) exit, the second protective relaying device of n polar curve road (9) is mounted on the n polar curve
Road the second bus (11) exit.
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| CN110265990B (en) * | 2018-03-12 | 2023-11-14 | 丁美连 | Multi-well coupling common direct current bus voltage balance control and fault detection method for oil pumping unit |
| CN109188174B (en) * | 2018-09-26 | 2020-06-02 | 华中科技大学 | Method for judging AC line outlet fault |
| EP3723224B1 (en) * | 2019-04-08 | 2023-08-23 | Hitachi Energy Switzerland AG | Time domain distance protection based on polarity comparison for power transmission lines |
| CN110212489B (en) * | 2019-05-20 | 2020-07-28 | 华中科技大学 | High-voltage direct-current line distance protection method based on criterion extreme value estimation |
| EP3961836A1 (en) * | 2020-09-01 | 2022-03-02 | Hitachi Energy Switzerland AG | Determining of a power line fault |
| CN113972632B (en) * | 2021-10-09 | 2022-09-20 | 华中科技大学 | Direct current line pilot direction protection method, device and system |
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| CN104977502B (en) * | 2015-06-11 | 2017-11-10 | 昆明理工大学 | A kind of extra high voltage direct current transmission line internal fault external fault recognition methods |
| CN105467273B (en) * | 2015-12-17 | 2020-05-12 | 中国电力科学研究院 | Polarization quantity criterion realization method in single-end quantity distance protection |
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