CN1870378A - Travelling wave identification method of superhigh voltage DC line fault - Google Patents
Travelling wave identification method of superhigh voltage DC line fault Download PDFInfo
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Abstract
This invention relates to a method for identifying traveling waves of super-high voltage DC circuit faults, which applies a reverse identification method: A, judgment of fault pole: Wcx=Diff_bx(t)*Com_bx(t), in which, x=1,2, if the short time integral value of Wcx is greater than a constant value, then it is decided that the local pole is fault, otherwise, it is not, B, abrupt volume of traveling waves, C, integral volume of the traveling waves, D, testing if the DC current is over the constant value or the DC voltage meets the criterion of the low constant value, A to C or D make up of the action conditions of the circuit traveling wave protection.
Description
One, technical field
The present invention relates to the travelling wave identification method of HVDC (High Voltage Direct Current) transmission system DC line fault, with relevant protective relaying device.
Two, background technology
High voltage direct current transmission is because its distinctive advantage, such as long distance, high-power, asynchronous networking, power quick adjustment, trend controllability, the economy of transmitting electricity etc., and being applied more and more widely.The core of HVDC (High Voltage Direct Current) transmission system is a high-voltage dc transmission electric control protection system, and it comprises control system and protection system.DC power transmission line is long apart from imperative equipment in the HVDC (High Voltage Direct Current) transmission system.
DC line fault is common HVDC (High Voltage Direct Current) transmission system fault.Wherein, travelling wave identification method is effective DC line protection method.The HVDC (High Voltage Direct Current) transmission system direct voltage is in high pressure (with respect to the earth) all the time, and that this point and AC system are transmitted electricity is obviously different (alternation, zero crossing is arranged).According to wave theory, must there be capable ripple on DC line, to come and go during fault and propagates.Make travelling wave identification method feasible, reliable theoretically.
The difficult point that DC line protection realizes is: DC power transmission line is long, and protection needs to cover road completely; Need to distinguish the faulty line utmost point, the non-fault line utmost point does not allow action; Need to distinguish line fault and normal utmost point start-stop, and the protection of logicalnot circuit fault stoppage in transit, also have the transfer of interpolar power; Need discern whether circuit is struck by lightning by moment; Need to adapt to various operational modes (as the metallic return operation), various electric pressures (brownout operation etc.).
The method of the capable ripple identification of existing superhigh voltage DC line fault mainly contains returning wave sampling determining method and returning wave integration determining method.
The method of the capable ripple identification of existing superhigh voltage DC line fault can be described below:
The implication of the symbol that is adopted during description is seen Fig. 1:
Among Fig. 1, UDL1 is the utmost point 1 direct voltage, and IDL1 is the utmost point 1 direct current, and UDN1 is the utmost point 1 a neutral bus voltage; UDL2 is the utmost point 2 direct voltages, and IDL2 is the utmost point 2 direct currents, and UDN2 is the utmost point 2 neutral bus voltages; IDEL is the earth electrode wire current.The current direction when positive direction of direct current is normal the operation, the positive direction of earth electrode wire current is for flowing to the earth direction.
According to the wave equation theory, voltage and current structure forward-travelling wave and returning wave.Can conversion be decomposed into differential mode (line mould) amount and common mode (topotype) amount.
Returning wave:
b(t)＝Z*Delta(IDL(t))-Delta(UDL(t)) (1)
Wherein, Z is a surge impedance of a line; Delta (.) represents differential (sudden change amount); T is a time variable.
What be made of UDN, IDEL in addition, is common mode returning wave (also claiming the topotype returning wave).Its wave impedance is common mode wave impedance (also claiming the topotype wave impedance).
Returning wave sampling determining method: extract several discrete points of returning wave, compare with definite value.Deterministic process is an order comparison procedure; Just 1 satisfy definite value after, window and investigate down a bit.During bipolar operation, the common mode returning wave also need surpass definite value.In addition, detect direct current sudden change amount simultaneously and whether surpass definite value, and whether direct voltage satisfies assistant criteria such as low definite value criterion.Their common operation conditions that constitutes the circuit traveling-wave protection.
Returning wave integration determining method: the returning wave value of accumulation a period of time (as 10 milliseconds), compare with definite value.In addition, detect direct voltage sudden change amount simultaneously and whether surpass assistant criteria such as definite value.Their common operation conditions that constitutes the circuit traveling-wave protection.
Also have a kind of algorithm that is called traveling-wave protection: utilize direct voltage sudden change amount, the integration of external dc electric current sudden change amount is judged.There is not to adopt forward direction or the returning wave that obtains according to the wave equation theory.Can find out that from (1) formula this algorithm is actual, and what utilize is two primary elements that constitute the row ripple.
The weak point of the method for the capable ripple identification of existing superhigh voltage DC line fault: when lightning (thunderbolt) arrives circuit, the easy malfunction of traveling-wave protection.When lightning (thunderbolt) arrives circuit, can cause the sudden change of direct voltage and direct current; But the most applications circuit is therefore not impaired, and lightning (thunderbolt) still can normally move later.Whether existing traveling-wave protection is not easy to distinguish out circuit is the situation of being struck by lightning.
Three, summary of the invention
The objective of the invention is: propose a kind of travelling wave identification method of new superhigh voltage DC line fault, except correct identification DC line fault, avoid lightning (thunderbolt) to cause the malfunction of traveling-wave protection.
The travelling wave identification method of superhigh voltage DC line fault adopts returning wave identification,
The utmost point 1 is had:
b1(t)＝Z*Delta(IDL1(t))-Delta(UDL1(t))
(2)
The utmost point 2 is had:
b2(t)＝Z*Delta(IDL2(t))-Delta(UDL2(t))
(3)
In the formula, UDL1 is the utmost point 1 direct voltage, and IDL1 is the utmost point 1 direct current; UDL2 is the utmost point 2 direct voltages, and IDL2 is the utmost point 2 direct currents.Z is a surge impedance of a line; Delta (.) represents differential (sudden change amount); T is a time variable.
Row ripple differential mode (line mould) amount (for the utmost point 1):
Diff_b1(t)＝0.5*(b1(t)-b2(t))
(4)
Row ripple common mode (topotype) amount (for the utmost point 1):
Com_b1(t)＝0.5*(b1(t)+b2(t))
(5)
For the utmost point 2:
Diff_b2(t)＝-1.0*Diff_b1(t)，Com_b2(t)＝Com_b1(t)
(6)
Attention: capable ripple common mode (topotype) amount here is not made of UDN1 (UDN2), IDEL.In principle, two kinds of formations are the same.
Algorithm or criterion:
A) differentiation of the fault utmost point:
Wcx＝Diff_bx(t)*Com_bx(t) (7)
In the formula, x=1,2, down together.If the integrated value in short-term of Wcx (time of integration, routine was about 1 millisecond) greater than certain definite value, then is judged to this utmost point fault; Otherwise, be non-utmost point fault.
B) go ripple sudden change amount:
Delta (Diff_bx (t))＞differential mode sudden change definite value (8)
Delta (Com_bx (t))＞common mode sudden change definite value (9)
C) go the ripple integration amount: (time of integration, routine was 1 millisecond)
Integ (Diff_bx (t))＞differential mode integration definite value (10)
Integ (Com_bx (t))＞common mode integration definite value (11)
In the formula, Integ (.) represents integral and calculating.
D) detect direct current sudden change amount and whether surpass definite value, and whether direct voltage satisfies low definite value criterion.
A) to D) constitute the operation condition of circuit traveling-wave protection jointly.
More than the roughly function description of 4 Rule of judgment as follows: condition A) distinguish the fault utmost point and the non-fault utmost point; Condition B) helps distinguishing line areas fault and, and distinguish and normally rise/stop and line fault utmost point bus district, station fault; Condition C) helps distinguishing lightning (thunderbolt) fault and line fault; Condition D) is assistant criteria, helps preventing this protection malfunction.
What Fig. 2 showed is the realization block diagram of the travelling wave identification method of this superhigh voltage DC line fault.
The OP implication is meant another utmost point; ' row ripple differential mode common mode ' module perfect (2)-(5) function.
Characteristics of the present invention: the advantage of existing capable ripple algorithm has been merged in the present invention.Adopt the differential mode of returning wave and common mode as the basic operation element, algorithm clear concept, each algorithm Rule of judgment coverage rate or claim that design philosophy has nothing in common with each other.Avoided lightning maloperation situations such as (thunderbolts) effectively.
Four, description of drawings
Fig. 1 is the implication explanation of value of the present invention
Fig. 2 is the realization block diagram of the travelling wave identification method of a kind of new superhigh voltage DC line fault of the present invention
Five, embodiment
Read sampled value, adopt the realization block diagram of Fig. 2, the action that is protected.
The cooperation of some times is arranged in the algorithm implementation process, mainly contain time-delay, broadening, wait.Main cause is each decision content under the far and near different situation in the circuit position of fault, and the moment of fault reaction is different.Prevent that malfunction from also being required consideration when choosing these time values big or small.
Definite value is selected reference: various power transmission engineering can be taked different parameters.With the Ge Nan engineering is example, the about 300kV/ms of common mode sudden change definite value, the about 210kV of differential mode integration definite value, the about 350kV of common mode integration definite value.
Among the figure, the OP implication is meant another utmost point, ' row ripple differential mode common mode ' module perfect (2)-(5) function.
Claims (3)
1, the travelling wave identification method of superhigh voltage DC line fault is characterized in that: adopt returning wave,
The utmost point 1 is had: b1 (t)=Z*Delta (IDL1 (t))-Delta (UDL1 (t))
(2)
The utmost point 2 is had: b2 (t)=Z*Delta (IDL2 (t))-Delta (UDL2 (t)) (3)
In the formula, UDL1 is the utmost point 1 direct voltage, and IDL1 is the utmost point 1 direct current; UDL2 is the utmost point 2 direct voltages, and IDL2 is the utmost point 2 direct currents.Z is a surge impedance of a line; Delta (.) represents differential; T is a time variable;
To the utmost point 1 row ripple differential mode amount:
Diff_b1(t)＝0.5*(b1(t)-b2(t))
(4)
To the utmost point 1 row ripple common mode amount:
Com_b1(t)＝0.5*(b1(t)+b2(t))
(5)
For the utmost point 2:
Diff_b2(t)＝-1.0*Diff_b1(t)，Com_b2(t)＝Com_b1(t)
(6)
Method of discrimination:
A) differentiation of the fault utmost point:
Wcx＝Diff_bx(t)*Com_bx(t) (7)
In the formula, x=1,2, down together.If the integrated value in short-term of Wcx then is judged to this utmost point fault greater than certain definite value; Otherwise, be non-utmost point fault;
B) go ripple sudden change amount:
Delta (Diff_bx (t))＞differential mode sudden change definite value (8)
Delta (Com_bx (t))＞common mode sudden change definite value (9)
C) go the ripple integration amount:
Integ (Diff_bx (t))＞differential mode integration definite value (10)
Integ (Com_bx (t))＞common mode integration definite value (11)
In the formula, Integ (.) represents integral and calculating;
A) to C) constitute the operation condition of circuit traveling-wave protection jointly.
2,, it is characterized in that the about 300kV/ms of common mode sudden change definite value, the about 210kV of differential mode integration definite value, the about 350kV of common mode integration definite value by the travelling wave identification method of the described superhigh voltage DC line fault of claim 1.
3,, it is characterized in that being provided with in addition D by the travelling wave identification method of the described superhigh voltage DC line fault of claim 1) whether detect direct current sudden change amount above definite value, and whether direct voltage satisfies low definite value criterion.
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| CN104360222A (en) * | 2014-12-09 | 2015-02-18 | 国网宁夏电力公司 | Rapid calculation method of high-voltage/extra-high voltage direct current (DC) transmission line fault voltage traveling wave |
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