CN106410768B - A method of control high voltage DC breaker - Google Patents
A method of control high voltage DC breaker Download PDFInfo
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- CN106410768B CN106410768B CN201611026120.4A CN201611026120A CN106410768B CN 106410768 B CN106410768 B CN 106410768B CN 201611026120 A CN201611026120 A CN 201611026120A CN 106410768 B CN106410768 B CN 106410768B
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Classifications
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
Abstract
The invention discloses a kind of methods of control high voltage DC breaker, including：The electric signal parameter on each DC line in power circuit where each high voltage DC breaker is obtained, and goes out pre- faulty line according to pre- breakdown judge Rules Filtering；Wherein, the number of pre- faulty line is more than the number of physical fault circuit；It controls the corresponding switch of each pre- faulty line and executes dynamic operational order, while fault location is carried out to determine physical fault circuit to each pre- faulty line；It controls the corresponding switch of each physical fault circuit and executes disconnected operational order, and control the corresponding state switched before restoring to move operational order to execution of remaining pre- faulty line in addition to each physical fault circuit.This method can in advance operate pre- faulty line into action and be positioned simultaneously to pre- faulty line, therefore, after saving fault location, again into the time of action operation, and then the possibility that fault current is more than high voltage DC breaker cut-out current capacity is reduced, improve the reliability of high voltage DC breaker.
Description
Technical field
The present invention relates to power electronics fields, more particularly to a kind of method of control high voltage DC breaker.
Background technology
Recently as the development of technology of transmission of electricity, HVDC Transmission Technology is using more and more extensive, and DC transmission system is
As the indispensable part of power delivery network.DC transmission system is compared with AC transmission system, since its damping is low, therefore
Barrier development is fast, causes to occur a series of troubleshooting problems such as control protection difficulty is big.
In order to solve these problems, the method for having used for reference conventional AC transmission system troubleshooting is disconnected using high voltage direct current
Road device carries out effective Fault Isolation.In DC transmission system, including multiple high voltage DC breakers, each high voltage direct current are disconnected
Road utensil has multiple input output end.Fig. 1 is the structure chart of high voltage DC breaker in the prior art.As shown in Figure 1, high straightening
It includes a cut-off switch S, multiple upper flow passage switch S1N and multiple lower flow passage switch S2N to flow breaker.Cut-off switch S's is upper
End is connected with upper DC bus L1, and the lower end of cut-off switch S is connected with lower DC bus L2.Upper DC bus L1 through-flow is opened with upper
The upper end connection of S1N is closed, lower DC bus L2 is connect with the lower end of lower flow passage switch S2N, and the lower end of upper flow passage switch S1N is under
The upper end of flow passage switch S2N connects, the upper end of input/output terminal I/O through the lower end of current-limiting reactor L and upper flow passage switch S1N and
The upper end of lower flow passage switch S2N is connected, and the lower end of input/output terminal I/O is connect with transverter or DC line.
When the circuit where high voltage DC breaker is normal, the upper flow passage switch of each of high-voltage circuitbreaker is conducting
, what lower flow passage switch was off, and cut-off switch is off.Therefore each input/output terminal is corresponding through-flow by its
Switch is connect with supply line, to power for DC line connected to it.If a certain DC line breaks down,
It needs to control the corresponding switch in the high voltage DC breaker where the DC line to be acted accordingly, generation is isolated
The circuit of failure.
In the prior art, it is for the control mode of high voltage DC breaker：First to every on each high voltage DC breaker
A circuit carries out fault location, and open circuit is sent when the circuit to break down is determined, then to corresponding high voltage DC breaker
Device action command, breaker actuation instruction includes dynamic operational order and disconnected operational order two parts, and so-called dynamic operational order is just
It is the cut-off switch conducting for the circuit that will be broken down, upper flow passage switch shutdown, lower flow passage switch conducting；So-called disconnected operational order
It is exactly to turn off the cut-off switch in the high voltage DC breaker again on the basis of dynamic operational order.The above process is exactly
The method for controlling high voltage DC breaker, but since high voltage DC breaker is when executing breaker actuation instruction, either
Still disconnected operational order has certain delay, especially dynamic operating process to be influenced, be delayed by mechanical switch to dynamic operational order
It is longer.And when sending breaker actuation instruction, has there is failure in the circuit at place, and it is dynamic to execute breaker in high-voltage circuitbreaker
During instructing, the electric current on the faulty line can exceed that high voltage DC breaker electric current is cut still in rapid increase
The upper limit of cutting capacity causes the respective switch of high voltage DC breaker that can not be instructed according to breaker actuation and carries out, therefore right
There are larger impact and damage in high voltage DC breaker itself and the circuit to break down.
It can be seen that how to reduce the damage of high voltage DC breaker and ensure that the reliability of high voltage DC breaker is this
Field technology personnel's urgent problem to be solved.
Invention content
The object of the present invention is to provide a kind of methods of control high voltage DC breaker, can break down in power circuit
When, the corresponding dc circuit breaker of pre- faulty line is controlled in advance into action operational order, is reduced dc circuit breaker and is fully disconnected
Prior fault current rise time reduces the damage of high voltage DC breaker and improves the reliability of high voltage DC breaker.
In order to achieve the above objectives, the present invention provides a kind of method of control high voltage DC breaker, includes the following steps：
S10：The electric signal parameter on each DC line in acquisition power circuit where each high voltage DC breaker, and according to
Go out pre- faulty line according to pre- breakdown judge Rules Filtering；Wherein, the number of the pre- faulty line is more than physical fault circuit
Number；
S11：It controls the corresponding switch of each pre- faulty line and executes and move operational order, while to each pre- fault wire
Road carries out fault location to determine physical fault circuit；
S12：It controls the corresponding switch of each physical fault circuit and executes the operational order that breaks, and control and remove each reality
The corresponding switch of remaining pre- faulty line outside faulty line restores to the state executed before the dynamic operational order.
Preferably, the S10 is specifically included：
Obtain the current changing rate of each input/output terminal of each high voltage DC breaker；
Judge whether the maximum value in each current changing rate is more than first predetermined value；
If it is, determining that the DC line more than the first predetermined value is the pre- faulty line.
Preferably, the S10 is specifically included：
Obtain the voltage change ratio of each input/output terminal of each high voltage DC breaker；
Judge whether the maximum value in each voltage change ratio is more than second predetermined value；
If it is, determining that the DC line more than the second predetermined value is the pre- faulty line.
Preferably, the S10 is specifically included：
Obtain the current changing rate and voltage change ratio of each input/output terminal of each high voltage DC breaker；
Judge each voltage change ratio and each voltage change ratio and in maximum value whether make a reservation for more than third
Value；
If it is, determining that the DC line more than the third predetermined value is the pre- faulty line.
Preferably, the S10 is specifically included：
Obtain the current changing rate and voltage change ratio of each input/output terminal of each high voltage DC breaker；
Calculate the difference of each current changing rate and current changing rate a reference value using as the effective increment of each electric current and
The difference of each voltage change ratio and voltage change ratio a reference value is using as the effective increment of each voltage；
The maximum value in the maximum value and each effective increment of the voltage in each effective increment of the electric current is filtered out, and is counted
The ratio of the maximum value in each effective increment of the electric current and the effective increment of electric current is calculated using as the unified effective increment of each electric current, with
And the ratio of the maximum value in each effective increment of the voltage and the effective increment of voltage as each voltage to unify effective increment；
Calculate the unified effective increment of the electric current of each input/output terminal and the unified effective increment of the voltage and
Using as unified effective increment summation；
Judge the maximum value in the effective increment summation of each unification whether more than the 4th predetermined value；
If it is, determining that the DC line more than the 4th predetermined value is the pre- faulty line.
Preferably, the corresponding incremental time of the current changing rate is not more than 200us.
Preferably, the corresponding incremental time of the voltage change ratio is not more than 200us.
Preferably, the 4th predetermined value is 1.5.
A kind of method of control high voltage DC breaker provided by the present invention, obtains the electric signal on DC line in real time
Parameter judges that Rules Filtering goes out pre- faulty line according to pre-, and is executed to the corresponding switch of pre- faulty line and move operational order
Actual faulty line is determined, then to the corresponding switch of actual faulty line to fault location by the prior art simultaneously
The operational order that breaks is executed, and dynamic to its execution is restored to the pre- faulty line for performing dynamic operational order in addition to physical fault
State before operational order.
Therefore, the present invention filters out pre- faulty line first before circuit failure, and to pre- faulty line
While carrying out fault location, dynamic operational order just is performed to pre- faulty line, after orienting physical fault circuit, directly
To physical fault circuit execute break operational order, and by executed dynamic operational order and be not physical fault circuit circuit it is extensive
It is multiple, to complete the isolation to physical fault circuit, compared with prior art, the present invention can control in advance pre- faulty line into
Action operational order, to save after orienting physical fault circuit, then executes the time of dynamic operational order, so reducing
The rise time of fault current thereby reduces the failure of current ability upper limit of the fault current more than high voltage DC breaker
Possibility improves the reliability of high voltage DC breaker.
Description of the drawings
In order to illustrate the embodiments of the present invention more clearly, attached drawing needed in the embodiment will be done simply below
It introduces, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ordinary skill people
For member, without creative efforts, other drawings may also be obtained based on these drawings.
Fig. 1 is the structure chart of high voltage DC breaker in the prior art；
Fig. 2 is a kind of flow chart of the method for control high voltage DC breaker disclosed by the embodiments of the present invention；
Fig. 3 is the flow chart of another method for controlling high voltage DC breaker disclosed by the embodiments of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole embodiments.Based on this
Embodiment in invention, without making creative work, what is obtained is every other by those of ordinary skill in the art
Embodiment belongs to the scope of the present invention.
Core of the invention is to provide a kind of method of control high voltage DC breaker, by obtaining each high voltage direct current open circuit
The electric signal parameter of device is judged using pre- breakdown judge rule, filters out pre- faulty line, is executed to pre- faulty line
It carries out fault location while dynamic operational order, after the completion of fault location, the operational order that breaks directly is executed to faulty line, you can
Complete the isolation to faulty line.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Embodiment one
Fig. 2 is a kind of flow chart of the method for control high voltage DC breaker disclosed by the embodiments of the present invention, such as Fig. 2 institutes
Show, this method specifically includes：
S10：The electric signal parameter on each DC line in acquisition power circuit where each high voltage DC breaker, and according to
Go out pre- faulty line according to pre- breakdown judge Rules Filtering.
Wherein, the number of pre- faulty line is more than the number of physical fault circuit.
In the specific implementation, power circuit includes multiple high voltage DC breakers, and each high voltage DC breaker has multiple
Input/output terminal, each input/output terminal connect a DC line.For step S10, it can obtain in real time, it can also
It periodically obtains, the present embodiment is not construed as limiting.It is understood that if periodically obtained, it is possible to reduce operand, but
It is possible to miss best acquisition time；It measures if it is real-time, although operand is larger, can more timely obtain
The parameter of electric signal on each DC line.Electric signal parameter can be current changing rate parameter, voltage change ratio in this step
The entirety of parameter or current changing rate parameter and voltage change ratio parameter.According to pre-set pre- breakdown judge rule, pass through
The electric signal parameter of acquisition filters out in each high voltage DC breaker, most possible abnormal input/output terminal occur, then this is defeated
DC line where entering output is exactly pre- faulty line.It is understood that pre- breakdown judge rule is compared with the existing technology
In accurate fault location rule for be intended merely to filter out the circuit for being likely to occur failure in advance, rather than really occur
The circuit of failure.Therefore, pre- breakdown judge rule is more looser than accurate fault location rule, in other words, passes through accurate event
If barrier locating rule is capable of determining that 2 physical fault circuits, then 2 or more can be filtered out by pre- breakdown judge rule
Pre- faulty line, and the circuit of 2 physical faults is contained in 2 or more pre- faulty lines.In conclusion pre- failure is sentenced
How disconnected rule is arranged needs depending on actual conditions, as long as ensureing after the judgement of pre- breakdown judge rule, filters out
The number of pre- faulty line is more than the number of physical fault circuit.
S11：It controls the corresponding switch of each pre- faulty line and executes dynamic operational order, while event is carried out to each pre- faulty line
Barrier positioning is to determine physical fault circuit.
In order to allow those skilled in the art more to understand technical scheme of the present invention, it is subject to specific example in the present embodiment
Explanation, it is to be understood that example is a kind of specific application scenarios, and representative can only be a kind of embodiment party in example
Formula.Such as：Include 4 high voltage DC breakers, respectively high voltage DC breaker Q1, high voltage direct current open circuit in power circuit
Device Q2, high voltage DC breaker Q3 and high voltage DC breaker Q4.Include that multiple input is defeated in each high voltage DC breaker
The quantity of outlet, input/output terminal may be the same or different, as high voltage DC breaker structure referring to Fig. 1, this reality
Example is applied to repeat no more.The present embodiment illustrates so that each high voltage DC breaker includes 3 input/output terminals as an example, respectively No. 1
Input/output terminal, No. 2 input/output terminals and No. 3 input/output terminals.For example, in the specific implementation, by the judgement of step S10,
The corresponding DC line of No. 1 input/output terminal of high voltage DC breaker Q1 be pre- faulty line, high voltage DC breaker Q3 2
Number corresponding DC line of input/output terminal is that No. 2 input/output terminals of pre- faulty line and high voltage DC breaker Q4 are corresponding
DC line is pre- faulty line.Then in high voltage DC breaker Q1 accordingly switch (switch where pre- faulty line),
It is switched accordingly in high voltage DC breaker Q3 corresponding in (switch where pre- faulty line) and high voltage DC breaker Q4
It switchs (switch where pre- faulty line) and executes dynamic operational order, it is to be understood that be exactly to high voltage DC breaker Q1
No. 1 input/output terminal, high voltage DC breaker Q3 No. 2 input/output terminals and high voltage DC breaker Q4 No. 2 inputs it is defeated
The cut-off switch of switch and high voltage DC breaker Q1 where outlet, the cut-off switch and height of high voltage DC breaker Q2
The cut-off switch of straightening stream circuit breaker Q 3, which executes, moves operational order.Wherein, in the present embodiment, it is that conducting is high to move operational order then
The cut-off switch of straightening stream circuit breaker Q 1, high voltage DC breaker Q3 and high voltage DC breaker Q4, conducting high voltage direct current open circuit
No. 1 input/output terminal of device Q1, No. 2 of No. 2 input/output terminals of high voltage DC breaker Q3 and high voltage DC breaker Q4 it is defeated
Enter the corresponding lower flow passage switch of output end, No. 1 input/output terminal, the high voltage DC breaker Q3 of shutdown high voltage DC breaker Q1
No. 2 input/output terminals and high voltage DC breaker Q4 the corresponding upper flow passage switch of No. 2 input/output terminals.
It should be noted that when executing dynamic operational order, fault location operation is also carrying out simultaneously, because having screened
Go out pre- faulty line, so when carrying out fault location, it is only necessary to which fault location is carried out to pre- faulty line.Wherein, by
In fault location using the prior art, the present embodiment wouldn't repeat its specific operating process.
S12：It controls the corresponding switch of each physical fault circuit and executes the operational order that breaks, and control and remove each physical fault circuit
The corresponding switch of the pre- faulty line of remaining outer restores to the state executed before moving operational order.
In the specific implementation, after the completion of fault location, refer to immediately to determining that the circuit to break down directly executes disconnected operation
It enables, the cut-off switch of the practical high-voltage circuitbreaker to break down for shutdown of the operational order that breaks.Pre- event to not breaking down simultaneously
Barrier circuit restores its state before being not carried out dynamic operational order to inductive switch, i.e., by the upper logical of the pre- faulty line of non-failure
Flow switch conduction, lower flow passage switch shutdown.
It is understood that such as the example above, No. 1 input/output terminal for orienting high voltage DC breaker Q1 is corresponding pre-
Faulty line is faulty line, then switch corresponding to high voltage DC breaker Q1 executes the operational order that breaks, that is, turns off high straightening
Flow the cut-off switch of circuit breaker Q 1.The switch corresponding to high voltage DC breaker Q3 and high voltage DC breaker Q4 is restored simultaneously
To before being not carried out dynamic operational order, that is, No. 2 input/output terminals and high voltage DC breaker of high voltage DC breaker Q3 are connected
The corresponding upper flow passage switch of No. 2 input/output terminals of Q4, No. 2 input/output terminals and high straightening of shutdown high voltage DC breaker Q3
Flow the corresponding lower flow passage switch of No. 2 input/output terminals of circuit breaker Q 4.
It is respectively opened under different conditions to allow those skilled in the art to become apparent from above-described embodiment mesohigh dc circuit breaker
The turn-on and turn-off condition of pass, below according to the specific example in above-described embodiment, recycling table 1 illustrates each height under different conditions
The turn-on and turn-off condition respectively switched in pressure dc circuit breaker.
No. 1 input/output terminal of high voltage DC breaker Q1, No. 2 input/output terminals of high voltage DC breaker Q3 and high pressure
One column of mode of operation and disconnected operation shape are moved in each switch conditions such as table 1 corresponding to No. 2 input/output terminals of dc circuit breaker Q4
Shown in one column of state.
Table 1
Wherein, No. Q1-1, No. Q3-2 and No. Q4-2 No. 1 input and output for respectively representing high voltage DC breaker Q1 in table 1
It holds, No. 2 input/output terminals of No. 2 input/output terminals of high voltage DC breaker Q3 and high voltage DC breaker Q4.It is original in table
When what one column of state indicated is that power circuit does not break down, No. 1 input/output terminal, the high voltage direct current of high voltage DC breaker Q1
Each switch conditions corresponding to No. 2 input/output terminals of circuit breaker Q 3 and No. 2 input/output terminals of high voltage DC breaker Q4.Table
Middle "-" indicates to be not carried out any operation to each switch.
In embodiments of the present invention, while carrying out fault location, dynamic operational order just is performed to pre- faulty line,
After orienting faulty line, the operational order that breaks directly is executed to faulty line, you can isolation to faulty line is completed, and it is existing
There is technology to compare, present invention saves after orienting faulty line, then execute the time of dynamic operational order, thus reduce therefore
The rise time for hindering electric current thereby reduces possibility of the fault current more than the failure of current ability upper limit of high voltage DC breaker
Property, improve the reliability of high voltage DC breaker.
Embodiment two
By the introduction of embodiment one, in order to make those skilled in the art become apparent from each high straightening in obtaining power circuit
Flow breaker where each DC line on different electrical signals parameter when, how to be embodied operation more specifically solved
It releases.
When the electric signal parameter of measurement is current changing rate parameter, then step S10 specifically comprises the following steps, remaining step
Suddenly the explanation of middle S11 and S12 are seen above.
S20：Obtain the current changing rate of each input/output terminal of each high voltage DC breaker.
S21：Judge whether the maximum value in each current changing rate is more than first predetermined value.Wherein, if it is, determining super
The DC line for crossing first predetermined value is pre- faulty line.
In the specific implementation, the electric signal measured in real time is current signal Idi, each input and output are calculated according to formula (1)
The current changing rate at end, wherein Δ IdiIndicating that current changing rate, dt indicate that the incremental time chosen is t, t is not more than 200us,
dIdiWhen indicating that the incremental time chosen is dt, value and DC current that DC current is carved at the beginning are reaching incremental time dt
The difference of the value at moment, i indicate No. i-th input/output terminal, and i is positive integer.Such as i=3, then Δ Id3Indicate No. 3 input and output
The current changing rate at end.It is calculated in each high voltage DC breaker after the current changing rate of each input/output terminal, is sentenced according to formula
Whether the maximum value in disconnected each high voltage DC breaker current changing rate is more than first predetermined value, if it does, then the electric current becomes
The corresponding DC line of rate is determined as pre- faulty line.
It should be noted that when the electric signal parameter measured is current changing rate, pre- breakdown judge rule is more than the
The DC line of one predetermined value is pre- faulty line.Wherein, first predetermined value can be adjusted according to actual conditions, such as requirement pair
Pre- faulty line judgement is accurate as far as possible, then first predetermined value can be arranged bigger than normal, but compared with the prior art, it is screened
The pre- faulty line number gone out is also greater than the number of physical fault circuit.
When the electric signal parameter of measurement is voltage change ratio, then step S10 specifically comprises the following steps, remaining step ginseng
See above the explanation of middle S11 and S12.
S30：Obtain the voltage change ratio of each input/output terminal of each high voltage DC breaker.
S31：Judge whether maximum value in each voltage change ratio is more than second predetermined value, if it is, determining more than the
The DC line of two predetermined values is pre- faulty line.
In the specific implementation, the electric signal measured in real time is voltage signal Udi, each input and output are calculated according to formula (2)
The voltage change ratio at end, wherein Δ UdiIndicate that voltage change ratio, dt indicate that the incremental time chosen is t, t little 200us, dUdi
When indicating that the incremental time chosen is dt, value and DC voltage that DC voltage is carved at the beginning are reaching the incremental time dt moment
Value difference.It is calculated in each high voltage DC breaker after the voltage change ratio of each input/output terminal, is judged each according to formula
Whether the maximum value in high voltage DC breaker voltage change ratio is more than second predetermined value, if it does, the then voltage change ratio
Corresponding DC line is determined as pre- faulty line.
It should be noted that when the electric signal parameter measured is voltage change ratio, pre- breakdown judge rule is more than the
The DC line of two predetermined values is pre- faulty line.Wherein, second predetermined value can be adjusted according to actual conditions, such as requirement pair
Pre- faulty line judgement is accurate as far as possible, then second predetermined value can be arranged bigger than normal, but compared with the prior art, it is screened
The pre- faulty line number gone out is also greater than the number of physical fault circuit.
When the electric signal parameter of measurement is current changing rate and voltage change ratio, then step S10 specifically includes following step
Suddenly, remaining step sees above the explanation of middle S11 and S12.
S40：Obtain the current changing rate and voltage change ratio of each input/output terminal of each high voltage DC breaker.
S41：Judge each voltage change ratio and each voltage change ratio and in maximum value whether more than third predetermined value, such as
Fruit is, it is determined that the DC line for being more than third predetermined value is pre- faulty line.
In the specific implementation, the electric signal measured in real time is the current signal I of each input/output terminaldiWith voltage signal Udi,
According to formula (3) calculate current changing rate and voltage change ratio and, wherein Δ IdiUdiIndicate that current changing rate becomes with voltage
The sum of rate, according to formula calculate each input/output terminal current changing rate and voltage change ratio and after, judge each high pressure
Whether dc circuit breaker current changing rate and voltage change ratio and middle maximum value is more than third predetermined value, if it does, then should
Current changing rate is determined as pre- faulty line with each corresponding DC line of voltage change ratio.
It should be noted that when the electric signal parameter measured is current changing rate and voltage change ratio, pre- breakdown judge rule
The DC line for being as more than then third predetermined value is pre- faulty line.Wherein, third predetermined value can be carried out according to actual conditions
Adjustment, such as require to pre- faulty line judge it is accurate as far as possible, then third predetermined value can be arranged bigger than normal, but with it is existing
Technology ratio, the pre- faulty line number filtered out are also greater than the number of physical fault circuit.
Wherein, the formula (1), (2) and (3) referred in above-described embodiment is respectively
Embodiment three
In order to improve the accuracy judged pre- faulty line, it is further reduced time when fault location, the present invention is real
The method that example also discloses another control high voltage DC breaker is applied, i.e., relative to each example in embodiment two, to telecommunications
Number parameter is improved on calculating, as shown in figure 3, Fig. 3 is that disclosed by the embodiments of the present invention another to control high voltage direct current disconnected
The flow chart of the method for road device.Wherein, the step S10 in embodiment one includes step S50- step S54, and detailed process is as follows：
S50：Obtain the current changing rate and voltage change ratio of each input/output terminal of each high voltage DC breaker.
S51：Calculate the difference of each current changing rate and current changing rate a reference value using as the effective increment of each electric current and
The difference of each voltage change ratio and voltage change ratio a reference value is using as the effective increment of each voltage.
In the specific implementation, after getting the current changing rate and voltage change ratio of each input/output terminal, calculating current has
The formula for imitating increment is (4), and the formula for calculating the effective increment of voltage is (5).Wherein, KIiIndicate the effective of DC current change rate
Increment, KUiIndicate effective increment of DC voltage change rate, rIrefFor a reference value of DC current change rate, rUrefFor direct current
The a reference value of buckling rate.
It should be noted that due to rIrefAnd rUrefBy HVDC transmission system topological structure, smoothing reactor, transmission of electricity
The influence of the parameters such as circuit therefore also can be different according to the size of its different value of HVDC transmission system parameter, occurrence
It can be determined by emulating, wherein rIrefMore than the change rate of DC current step response in HVDC transmission system, rUrefGreatly
The change rate of DC voltage step response voltage in HVDC transmission system.By calculating, work as KIiOr KUiThere is negative value
When, then K is directly setIiOr KUiValue be 0.
S52：The maximum value in the maximum value and the effective increment of each voltage in the effective increment of each electric current is filtered out, and is calculated each
The ratio of maximum value in the effective increment of electric current and the effective increment of electric current as each electric current to unify effective increment and each voltage
Effective increment and the ratio of the maximum value in the effective increment of voltage as each voltage to unify effective increment.
In the specific implementation, maximum value is picked out from calculated all effective increments of electric current, effectively increased as electric current
The maximum value of amount calculates the unified effective increment of electric current by formula (6).It is selected from calculated all effective increments of voltage
Go out maximum value, as the maximum value of the effective increment of voltage, the unified effective increment of voltage is calculated by formula (7).Wherein MIiTable
Show the effective increment of the unification of current changing rate, KImaxFor effective increment K of all current changing ratesIiIn maximum value, MUiIt indicates
The effective increment of unification of voltage change ratio, KUmaxFor effective increment K of all DC voltage change ratesUiIn maximum value.
It should be noted that working as KImaxOr KUmaxWhen being 0, then MIiOr MUiIt is directly disposed as 0.
S53：Calculate the unified effective increment of electric current of each input/output terminal and the unified effective increment of voltage and using as system
One effective increment summation.
In the specific implementation, the unified effective increment of electric current and the voltage that each input/output terminal is calculated by formula (8) are unified
The sum of effective increment, the two and PiAs unify effective increment summation.
S54：The maximum value in the effective increment summation of each unification is judged whether more than the 4th predetermined value, if it is, determining
DC line more than the 4th predetermined value is pre- faulty line.
In the specific implementation, the maximum value in the unified effective increment summation of each high voltage DC breaker is picked out, is judged each
Whether maximum value is more than the 4th predetermined value, i.e. PimaxWhether the 4th predetermined value is more than, if it exceeds, it is determined that maximum value institute is right
The DC line answered is pre- faulty line.
Wherein, the formula (4), (5), (6), (7) and (8) referred in above-described embodiment is respectively
Pi=MUi+MIi (8)
For example, the 4th predetermined value is 1.5, when the maximum value of unified effective increment summation in No. 1 high voltage DC breaker is
When 1.7, more than the 4th predetermined value 1.5, then corresponding to the maximum value in No. 1 high voltage DC breaker in unified effective increment summation
DC line be pre- faulty line, certainly, the 4th predetermined value can also be adjusted according to actual conditions, and the present embodiment is not done
It is specific to limit.
S11：It controls the corresponding switch of each pre- faulty line and executes dynamic operational order, while event is carried out to each pre- faulty line
Barrier positioning is to determine physical fault circuit.
S12：It controls the corresponding switch of each physical fault circuit and executes the operational order that breaks, and control and remove each physical fault circuit
The corresponding switch of the pre- faulty line of remaining outer restores to the state executed before moving operational order.
It should be noted that step S11 and step S12 have been described in embodiment one, this implementation wouldn't be superfluous
It states.
In the present embodiment, it after getting the voltage change ratio and current changing rate of each high voltage DC breaker, also carries out
More accurate to calculate, the pre- faulty line picked out is more accurate, acts number to reduce dc circuit breaker to the greatest extent, is meeting
In the case that fault point is promptly and accurately isolated, extend the service life of dc circuit breaker.
Above to it is provided by the present invention it is a kind of control high voltage DC breaker method be described in detail.Specification
In each embodiment described by the way of progressive, the highlights of each of the examples are it is different from other embodiment it
Locate, just to refer each other for identical similar portion between each embodiment.For the device disclosed in the embodiment, due to itself and reality
Apply that method disclosed in example is corresponding, so description is fairly simple, reference may be made to the description of the method.It should refer to
Go out, it for those skilled in the art, without departing from the principle of the present invention, can also be to the present invention
Some improvement and modification can also be carried out, these improvement and modification are also fallen within the protection scope of the claims of the present invention.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, depends on the specific application and design constraint of technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Claims (4)
1. a kind of method of control high voltage DC breaker, which is characterized in that include the following steps：
S10：The electric signal parameter on each DC line in power circuit where each high voltage DC breaker is obtained, and according to pre-
Breakdown judge Rules Filtering goes out pre- faulty line；Wherein, the number of the pre- faulty line is more than the number of physical fault circuit；
S11：Control the corresponding switch of each pre- faulty line and execute and move operational order, at the same to each pre- faulty line into
Row fault location is to determine physical fault circuit；
S12：It controls the corresponding switch of each physical fault circuit and executes the operational order that breaks, and control and remove each physical fault
The corresponding switch of remaining pre- faulty line outside circuit restores to the state executed before the dynamic operational order；
The S10 is specifically included：
Obtain the current changing rate of each input/output terminal of each high voltage DC breaker；
Judge whether the maximum value in each current changing rate is more than first predetermined value；
If it is, determining that the DC line more than the first predetermined value is the pre- faulty line；
Or the S10 is specifically included：
Obtain the voltage change ratio of each input/output terminal of each high voltage DC breaker；
Judge whether the maximum value in each voltage change ratio is more than second predetermined value；
If it is, determining that the DC line more than the second predetermined value is the pre- faulty line；
Or the S10 is specifically included：
Obtain the current changing rate and voltage change ratio of each input/output terminal of each high voltage DC breaker；
Judge each voltage change ratio and each voltage change ratio and in maximum value whether more than third predetermined value；
If it is, determining that the DC line more than the third predetermined value is the pre- faulty line；
Or the S10 is specifically included：
Obtain the current changing rate and voltage change ratio of each input/output terminal of each high voltage DC breaker；
The difference of each current changing rate and current changing rate a reference value is calculated using as the effective increment of each electric current and each institute
The difference of voltage change ratio and voltage change ratio a reference value is stated using as the effective increment of each voltage；
The maximum value in the maximum value and each effective increment of the voltage in each effective increment of the electric current is filtered out, and is calculated each
The ratio of maximum value in the effective increment of electric current and the effective increment of electric current is and each using as the unified effective increment of each electric current
The ratio of maximum value in the effective increment of voltage and the effective increment of voltage as each voltage to unify effective increment；
Calculate the unified effective increment of the electric current of each input/output terminal and the unified effective increment of the voltage and to make
For unified effective increment summation；
Judge the maximum value in the effective increment summation of each unification whether more than the 4th predetermined value；
If it is, determining that the DC line more than the 4th predetermined value is the pre- faulty line.
2. the method for control high voltage DC breaker according to claim 1, which is characterized in that the current changing rate pair
The incremental time answered is not more than 200us.
3. the method for control high voltage DC breaker according to claim 1, which is characterized in that the voltage change ratio pair
The incremental time answered is not more than 200us.
4. the method for control high voltage DC breaker according to claim 1, which is characterized in that the 4th predetermined value is
1.5。
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