CN102820643A - High voltage direct current power transmission line protection method based on voltage and current mutation direction - Google Patents

High voltage direct current power transmission line protection method based on voltage and current mutation direction Download PDF

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Publication number
CN102820643A
CN102820643A CN2012102955111A CN201210295511A CN102820643A CN 102820643 A CN102820643 A CN 102820643A CN 2012102955111 A CN2012102955111 A CN 2012102955111A CN 201210295511 A CN201210295511 A CN 201210295511A CN 102820643 A CN102820643 A CN 102820643A
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voltage
current
value
jump
protection
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CN2012102955111A
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CN102820643B (en
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陈青
邢鲁华
高湛军
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山东大学
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Abstract

The invention discloses a high voltage direct current power transmission line protection method based on a voltage and current mutation direction. The method comprises the following steps that when a fault exists in a line area, the directions of the voltage mutation quantity and the current mutation quantity at the protection measurement of a rectifying side are opposite, and the directions of the voltage mutation quantity and the current mutation quantity at an inverter side are the same; the feature is also applicable for anode lines and cathode lines; and faults at other areas do not satisfy the condition. Thus, the protection criterion of the high voltage direct current transmission line is structured and the protection method is disclosed. As the method provided by the invention is adopted in the protection of the direct current transmission line, actions can be performed fast and accurately when fault lightning, high impedance earthing faults and pole-pole faults exist in the line area; no error action is carried out under the situations of lightning disturbance, faults outside the line protection area and the like; the protection method is simple and clear; the requirement on communication channels is not high; the requirements on data calculating speed and sampling frequency are low; no synchronizing processing is required for sampled data; and various operation ways of a bipolar direct current power transmission system are applicable, and the practical value is high.

Description

HVDC transmission line guard method based on voltage, current break direction
Technical field
The present invention relates to relay protection method of power system, especially relate to a kind of HVDC transmission line guard method based on voltage, current break direction.
Background technology
The circuit of DC transmission engineering is long, leap is with a varied topography, and failure rate is higher, and the protection of direct current supply line effect is great.Existing protection of direct current supply line method mainly contains traveling-wave protection, under-voltage protection and differential protection.The traveling-wave protection quick action, but be subject to interference effect, it is very big that its reliability is influenced by the wave head testing result.Under-voltage protection maybe tripping when line-internal generation high resistance earthing fault.The influence that current differential protection is subject to fault transient and load adjustment process can not realize quick-action, and its reliability receives the influence of communication channel bigger.Research is applicable to the multiple operational mode of DC transmission system, be prone to realize, have reliable selectivity and HVDC transmission line guard method that can precision maneuver during high resistance grounding in district necessity very.
The HVDC transmission line guard method that proposes at present mainly comprises following several types: 1) utilize circuit voltage, jump-value of current or both products (being transient state energy) to realize the outer fault judgement of district's inner region; 2) combine traveling-wave protection method and boundary protection method to realize the route protection of one pole or bipolar DC system; 3) based on the New type of current differential protecting method or the distance protecting method of HVDC transmission line distributed parameter model.Above guard method has solved some defectives of existing protection of direct current supply line to a certain extent; But the multiple operational mode that whether can be used for DC transmission system is not discussed, and partial protection method having relatively high expectations to sample frequency, communication port and hardware.
Summary of the invention
The present invention is for solving the problems of the technologies described above, and provides a kind of and is applicable to the multiple operational mode of DC transmission system, is prone to realize, have reliable selectivity and the HVDC transmission line guard method of ability precision maneuver when high resistance grounding and the thunderbolt of fault property in the district.
To achieve these goals, the present invention adopts following technical scheme.
Based on the HVDC transmission line guard method of voltage, current break direction, the performing step of this method is following:
Step (1) is analyzed the voltage of protection of direct current supply line installation place, the direction character of jump-value of current;
Step (2) proposes to differentiate the criterion of voltage, jump-value of current direction:
Voltage jump amount and the integrated value of jump-value of current in a period of time are compared with the setting threshold value, differentiate the direction of voltage jump amount and jump-value of current;
Step (3) proposes HVDC transmission line protection criterion and method.
In the said step (1), in the moment of breaking down, promptly control system does not start or control system begins to adjust but do not adjust to yet in the transient process of stable state:
1) during negative or positive electrode circuit generating region internal fault, the voltage jump amount of rectification side protection measured place and jump-value of current is in the opposite direction on this polar curve road, and both directions of inversion side are identical.
When 2) utmost point-utmost point fault taking place, the rectification side protects voltage, the jump-value of current of measured place still to meet above characteristic with the inversion side.
Different during 3) with troubles inside the sample space, anodal with the negative pole converting plant during with Inverter Station reactor outside fault, the voltage of protection measured place, circuit two ends, the direction of jump-value of current is identical simultaneously or the while on the contrary.
4) direction character of voltage, jump-value of current is identical with the corresponding reactor outside fault during ac bus place fault.
In the said step (2),
1) since the transient analysis of above voltage, jump-value of current direction is back to adjuster takes place fault adjustment process do not accomplish before during this period of time, research shows that this adjustment process needs 5ms at least, so data window length should not be greater than 5ms; The thunder and lightning duration of disturbance is generally 3ms, so data window length should be greater than 3ms.To sum up, the data window length of integral and calculating is 5ms.
2) setting value of direct voltage control is chosen for 1.05p.u. usually, and under-voltage protection criterion definite value is taken as 0.7p.u. during high resistance grounding, and the threshold value of then differentiating voltage jump amount direction should be taken between 0.05 ~ 0.3p.u..The integrated value of rated voltage in 5ms of choosing 0.15 times is as the threshold value of differentiating voltage jump amount direction.In the direct current system current controling characteristic; The electric current nargin that most high voltage direct current transmission projects are adopted all is 0.1 times rated current; The fault steady-state current is 0.1 times a rated current; Therefore, the threshold value of differentiating the jump-value of current direction can be adjusted by 0.1 times the integrated value of rated current in 5ms.
3) voltage, jump-value of current discriminating direction criterion:
D ir(Δu)=1, ( Σ m = 1 N ( Δu ) > k r NU set )
D ir(Δu)=-1, ( &Sigma; m = 1 N ( &Delta;u ) < - k r NU set )
D ir(Δi)=1, ( &Sigma; m = 1 N ( &Delta;i ) > k r NI set )
D ir(Δi)=-1,
In the formula, Δ u, Δ i represent voltage, jump-value of current, D respectively IrExpression sudden change amount direction.If Set up, the direction of Δ u is designated as D for just Ir(Δ u)=1; If Set up, the direction of Δ u is designated as D for negative Ir(Δ u)=-1.In like manner, if Set up, the direction of Δ i is designated as D for just Ir(Δ i)=1; If Set up, the direction of Δ i is designated as D for negative Ir(Δ i)=-1.
In the formula, m=N, N are the sampled point number in the selected data window, and N is a natural number; Kr is a safety factor, desirable 1.2 ~ 1.5; U Set=0.15U n, U nRated voltage for DC transmission system; I Set=0.1I n, I nRated current for DC transmission system.4) the calculating spacing of voltage, jump-value of current is 10ms.If the protection sample frequency is 10kHz, the computing formula of Δ u and Δ i is respectively:
Δu(K)=u(K)-u(K-100)
Δi(K)=i(K)-i(K-100)
In the formula, K is the sampled point number, and K is the natural number greater than 100; U (K), i (K) represent K sampled value of voltage, electric current respectively, and u (K-100), i (K-100) represent (K-100) individual sampled value of voltage, electric current respectively, and Δ u (K), Δ i (K) represent K the voltage that calculates, the value of jump-value of current respectively.
In the said step (3), HVDC transmission line protection criterion:
During the line areas internal fault, the voltage jump amount of rectification side protection measured place and jump-value of current in the opposite direction, both directions of inversion side are identical; This characteristic all is suitable for electrode line road and negative pole circuit; Other external area errors all do not satisfy this condition.Can constitute HVDC transmission line protection criterion thus:
Utmost point i line areas internal fault:
D ir ( &Delta;u Ri ) &times; D ir ( &Delta;i Ri ) = - 1 D ir ( &Delta;u Ii ) &times; D ir ( &Delta;i Ii ) = 1
I is p or n, the make a comment or criticism utmost point or negative pole circuit.Δ u RpWith Δ i RpBe respectively voltage, the jump-value of current of anodal circuit rectification side protection measured place, Δ u IP, Δ i IpVoltage, jump-value of current for anodal circuit inversion side protection measured place.Δ u Rn, Δ i Rn, Δ u InWith Δ i InBe respectively voltage, the jump-value of current of negative pole circuit rectification side and inversion side protection measured place.
Based on above protection criterion; Direct current system is every extremely all to judge whether the route protection troubles inside the sample space separately; Therefore, this guard method is applicable to the multiple operational mode of DC transmission system, and only need judged the direction of voltage jump amount and jump-value of current; Not influenced by transition resistance, need not carry out the sampled data Synchronous Processing.
Step (3) mesohigh protection of direct current supply line method.
In DC transmission system, electric current shutoff after the identification circuit fault and system restart function and all accomplish in the rectification side.In the guard method of the present invention; In the opposite direction when rectification side voltage jump amount and jump-value of current, and when receiving the identical information of the direction of inversion side voltage jump amount and jump-value of current, the rectification side just can be sent the protection action command; And passing to the inversion side, two side outlets trip then.When inversion side direction information was passed to the rectification side, the interior communication time was about 20ms, considered compensation lock in time, should be with rectification side direction information output time-delay 20ms.
The invention has the beneficial effects as follows:
1. guard method is simply clear, only needs the directional information to terminal voltage, jump-value of current, and is less demanding to communication port;
2. calculating voltage, the integrated value of jump-value of current in the 5ms data window are low to data computational speed and sample frequency requirement, need not carry out the sampled data Synchronous Processing;
3. based on the directional information of voltage, jump-value of current, can quick and precisely move when the high resistance grounding fault and the utmost point in the thunderbolt of troubles inside the sample space property, district-utmost point fault; Not malfunction under situation such as thunderbolt interference and route protection external area error;
4. based on voltage, jump-value of current direction, irrelevant with the initial launch mode of DC transmission system, so this signature analysis is applicable to the multiple operational mode of DC transmission system, the practical value height.
Description of drawings
Fig. 1 is the bipolar direct current transmission system structure chart.
Fig. 2 is the guard method block diagram.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.
Be illustrated in figure 1 as the bipolar direct current transmission system structure chart that is suitable for of the present invention, the guard method performing step is following:
Step 1: the voltage of protection of direct current supply line installation place, the direction character of jump-value of current are analyzed:
In the moment of breaking down, promptly control system does not start or control system begins to adjust but do not adjust to yet in the transient process of stable state:
1) during negative or positive electrode circuit generating region internal fault, the voltage jump amount of rectification side protection measured place and jump-value of current is in the opposite direction on this polar curve road, and both directions of inversion side are identical.
When 2) utmost point-utmost point fault taking place, the rectification side protects voltage, the jump-value of current of measured place still to meet above characteristic with the inversion side.
Different during 3) with troubles inside the sample space, anodal with the negative pole converting plant during with Inverter Station reactor outside fault, the voltage of protection measured place, circuit two ends, the direction of jump-value of current is identical simultaneously or the while on the contrary.
4) direction character of voltage, jump-value of current is identical with the corresponding reactor outside fault during ac bus place fault.
Step 2: the criterion that proposes to differentiate voltage, jump-value of current direction:
Voltage jump amount and the integrated value of jump-value of current in a period of time are compared with the setting threshold value, differentiate the direction of voltage jump amount and jump-value of current.
1) since the transient analysis of above voltage, jump-value of current direction is back to adjuster takes place fault adjustment process do not accomplish before during this period of time, research shows that this adjustment process needs 5ms at least, so data window length should not be greater than 5ms; The thunder and lightning duration of disturbance is generally 3ms, so data window length should be greater than 3ms.To sum up, the data window length of integral and calculating is 5ms.
2) setting value of direct voltage control is chosen for 1.05p.u. usually, and under-voltage protection criterion definite value is taken as 0.7p.u. during high resistance grounding, and the threshold value of then differentiating voltage jump amount direction should be taken between 0.05 ~ 0.3p.u..The integrated value of rated voltage in 5ms of choosing 0.15 times is as the threshold value of differentiating voltage jump amount direction.In the direct current system current controling characteristic; The electric current nargin that most high voltage direct current transmission projects are adopted all is 0.1 times rated current; The fault steady-state current is 0.1 times a rated current; Therefore, the threshold value of differentiating the jump-value of current direction can be adjusted by 0.1 times the integrated value of rated current in 5ms.
3) voltage, jump-value of current discriminating direction criterion:
D ir(Δu)=1, ( &Sigma; m = 1 N ( &Delta;u ) > k r NU set )
D ir(Δu)=-1, ( &Sigma; m = 1 N ( &Delta;u ) < - k r NU set )
D ir(Δi)=1, ( &Sigma; m = 1 N ( &Delta;i ) > k r NI set )
D ir(Δi)=-1, ( &Sigma; m = 1 N ( &Delta;i ) < - k r NI set )
In the formula, Δ u, Δ i represent voltage, jump-value of current, D respectively IrExpression sudden change amount direction.If Set up, the direction of Δ u is designated as D for just Ir(Δ u)=1; If Set up, the direction of Δ u is designated as D for negative Ir(Δ u)=-1.In like manner, if Set up, the direction of Δ i is designated as D for just Ir(Δ i)=1; If Set up, the direction of Δ i is designated as D for negative Ir(Δ i)=-1.
In the formula, m=N, N are the sampled point number in the selected data window, and N is a natural number; k rBe safety factor, desirable 1.2 ~ 1.5; U Set=0.15U n, U nRated voltage for DC transmission system; I Set=0.1I n, I nRated current for DC transmission system.4) the calculating spacing of voltage, jump-value of current is 10ms.If the protection sample frequency is 10kHz, the computing formula of Δ u and Δ i is respectively:
Δu(K)=u(K)-u(K-100)
Δi(K)=i(K)-i(K-100)
In the formula, K is the sampled point number, and K is the natural number greater than 100; U (K), i (K) represent K sampled value of voltage, electric current respectively, and u (K-100), i (K-100) represent (K-100) individual sampled value of voltage, electric current respectively, and Δ u (K), Δ i (K) represent K the voltage that calculates, the value of jump-value of current respectively.
Step 3: propose HVDC transmission line protection criterion and method:
During the line areas internal fault, the voltage jump amount of rectification side protection measured place and jump-value of current in the opposite direction, both directions of inversion side are identical; This characteristic all is suitable for electrode line road and negative pole circuit; Other external area errors all do not satisfy this condition.Can constitute HVDC transmission line protection criterion thus:
Utmost point i line areas internal fault:
D ir ( &Delta;u Ri ) &times; D ir ( &Delta;i Ri ) = - 1 D ir ( &Delta;u Ii ) &times; D ir ( &Delta;i Ii ) = 1
I is p or n, the make a comment or criticism utmost point or negative pole circuit.Δ u RpWith Δ i RpBe respectively voltage, the jump-value of current of anodal circuit rectification side protection measured place, Δ u Ip, Δ i IpVoltage, jump-value of current for anodal circuit inversion side protection measured place.Δ u Rn, Δ i Rn, Δ u InWith Δ i InBe respectively voltage, the jump-value of current of negative pole circuit rectification side and inversion side protection measured place.
Based on above protection criterion; Direct current system is every extremely all to judge whether the route protection troubles inside the sample space separately; Therefore, this guard method is applicable to the multiple operational mode of DC transmission system, and only need judged the direction of voltage jump amount and jump-value of current; Not influenced by transition resistance, need not carry out the sampled data Synchronous Processing.
In DC transmission system, electric current shutoff after the identification circuit fault and system restart function and all accomplish in the rectification side.In the guard method of present embodiment; In the opposite direction when rectification side voltage jump amount and jump-value of current, and when receiving the identical information of the direction of inversion side voltage jump amount and jump-value of current, the rectification side just can be sent the protection action command; And passing to the inversion side, two side outlets trip then.When inversion side direction information was passed to the rectification side, the interior communication time was about 20ms, considered compensation lock in time, should be with rectification side direction information output time-delay 20ms.

Claims (5)

1. HVDC transmission line guard method based on voltage, current break direction, the performing step of this method is following:
Step (1) is analyzed the voltage of protection of direct current supply line installation place, the direction character of jump-value of current;
Step (2) proposes to differentiate the criterion of voltage, jump-value of current direction:
Voltage jump amount and the integrated value of jump-value of current in a period of time are compared with the setting threshold value, differentiate the direction of voltage jump amount and jump-value of current;
Step (3) proposes HVDC transmission line protection criterion and method.
2. the HVDC transmission line guard method based on voltage, current break direction as claimed in claim 1; It is characterized in that; In the said step (1), in the moment of breaking down, promptly control system does not start or control system begins to adjust but do not adjust to yet in the transient process of stable state:
1) during negative or positive electrode circuit generating region internal fault, the voltage jump amount of rectification side protection measured place and jump-value of current is in the opposite direction on this polar curve road, and both directions of inversion side are identical;
When 2) utmost point-utmost point fault taking place, the rectification side protects voltage, the jump-value of current of measured place still to meet above characteristic with the inversion side;
Different during 3) with troubles inside the sample space, anodal with the negative pole converting plant during with Inverter Station reactor outside fault, the voltage of protection measured place, circuit two ends, the direction of jump-value of current is identical simultaneously or the while on the contrary;
4) direction character of voltage, jump-value of current is identical with the corresponding reactor outside fault during ac bus place fault.
3. the HVDC transmission line guard method based on voltage, current break direction as claimed in claim 1 is characterized in that, in the said step (2),
1) since the transient analysis of above voltage, jump-value of current direction is back to adjuster takes place fault adjustment process do not accomplish before during this period of time, research shows that this adjustment process needs 5ms at least, so data window length should not be greater than 5ms; The thunder and lightning duration of disturbance is generally 3ms, so data window length should be greater than 3ms; To sum up, the data window length of integral and calculating is 5ms;
2) setting value of direct voltage control is chosen for 1.05p.u. usually, and under-voltage protection criterion definite value is taken as 0.7p.u. during high resistance grounding, and the threshold value of then differentiating voltage jump amount direction should be taken between 0.05 ~ 0.3p.u.; The integrated value of rated voltage in 5ms of choosing 0.15 times is as the threshold value of differentiating voltage jump amount direction; In the direct current system current controling characteristic; The electric current nargin that most high voltage direct current transmission projects are adopted all is 0.1 times rated current; The fault steady-state current is 0.1 times a rated current; Therefore, the threshold value of differentiating the jump-value of current direction is adjusted by 0.1 times the integrated value of rated current in 5ms;
3) voltage, jump-value of current discriminating direction criterion:
D ir(Δu)=1, ( &Sigma; m = 1 N ( &Delta;u ) > k r NU set )
D ir(Δu)=-1, ( &Sigma; m = 1 N ( &Delta;u ) < - k r NU set )
D ir(Δi)=1, ( &Sigma; m = 1 N ( &Delta;i ) > k r NI set )
D ir(Δi)=-1, ( &Sigma; m = 1 N ( &Delta;i ) < - k r NI set )
In the formula, Δ u, Δ i represent voltage, jump-value of current, D respectively IrExpression sudden change amount direction; If Set up, the direction of Δ u is designated as D for just Ir(Δ u)=1; If Set up, the direction of Δ u is designated as D for negative Ir(Δ u)=-1; In like manner, if Set up, the direction of Δ i is designated as D for just Ir(Δ i)=1; If Set up, the direction of Δ i is designated as D for negative Ir(Δ i)=-1;
In the formula, m=N, N are the sampled point number in the selected data window, and N is a natural number; Kr is a safety factor, gets 1.2 ~ 1.5; U Set=0.15U n, U nRated voltage for DC transmission system; I Set=0.1I n, I nRated current for DC transmission system;
4) the calculating spacing of voltage, jump-value of current is 10ms; If the protection sample frequency is 10kHz, the computing formula of Δ u and Δ i is respectively:
Δu(K)=u(K)-u(K-100)
Δi(K)=i(K)-i(K-100)
In the formula, K is the sampled point number, and K is the natural number greater than 100; U (K), i (K) represent K sampled value of voltage, electric current respectively, and u (K-100), i (K-100) represent (K-100) individual sampled value of voltage, electric current respectively, and Δ u (K), Δ i (k) represent K the voltage that calculates, the value of jump-value of current respectively.
4. the HVDC transmission line guard method based on voltage, current break direction as claimed in claim 1 is characterized in that, in the said step (3), and HVDC transmission line protection criterion:
During the line areas internal fault, the voltage jump amount of rectification side protection measured place and jump-value of current in the opposite direction, both directions of inversion side are identical; This characteristic all is suitable for electrode line road and negative pole circuit; Other external area errors all do not satisfy this condition; Constitute HVDC transmission line protection criterion thus:
Utmost point i line areas internal fault:
D ir ( &Delta;u Ri ) &times; D ir ( &Delta;i Ri ) = - 1 D ir ( &Delta;u Ii ) &times; D ir ( &Delta;i Ii ) = 1
I is p or n, the make a comment or criticism utmost point or negative pole circuit; Δ u RpWith Δ i RpBe respectively voltage, the jump-value of current of anodal circuit rectification side protection measured place, Δ u Ip, Δ i IpVoltage, jump-value of current for anodal circuit inversion side protection measured place; Δ u Rn, Δ i Rn, Δ u InWith Δ i InBe respectively voltage, the jump-value of current of negative pole circuit rectification side and inversion side protection measured place.
5. the HVDC transmission line guard method based on voltage, current break direction as claimed in claim 1 is characterized in that, step (3) mesohigh protection of direct current supply line method:
In DC transmission system, electric current shutoff after the identification circuit fault and system restart function and all accomplish in the rectification side; In the guard method of the present invention; In the opposite direction when rectification side voltage jump amount and jump-value of current, and when receiving the identical information of the direction of inversion side voltage jump amount and jump-value of current, the rectification side just can be sent the protection action command; And passing to the inversion side, two side outlets trip then; When inversion side direction information was passed to the rectification side, the interior communication time was about 20ms, considered compensation lock in time, should be with rectification side direction information output time-delay 20ms.
CN201210295511.1A 2012-08-20 2012-08-20 High voltage direct current power transmission line protection method based on voltage and current mutation direction CN102820643B (en)

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