CN116316512B - A method and system for regulating residual voltage of an arc extinguishing device - Google Patents
A method and system for regulating residual voltage of an arc extinguishing device Download PDFInfo
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- 230000033228 biological regulation Effects 0.000 claims abstract description 122
- 230000008033 biological extinction Effects 0.000 claims abstract description 29
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/12—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for AC mains or AC distribution networks for adjusting voltage in AC networks by changing a characteristic of the network load by adjustment of reactive power
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Abstract
The invention relates to the technical field of high-voltage distribution equipment, in particular to a fault residual voltage regulating method and system of an arc extinction device, comprising the following steps of S1, obtaining a voltage amplitude value of a fault point, carrying out reactive power regulation according to the voltage amplitude value before regulation and the voltage amplitude value, and fixing reactive power regulation after the regulation is finished; S2, acquiring the voltage amplitude of the fault point again, performing active adjustment on the fault point according to the voltage amplitude before adjustment and the voltage amplitude, S3, acquiring the voltage amplitude again for the fault point to serve as a new voltage amplitude before adjustment, and returning to S1. The invention has the beneficial effects that the residual voltage of the fault point is re-detected after arc extinction, reactive power adjustment and active power adjustment are carried out on the fault point in a time-sharing manner, and the voltage amplitude is decoupled during the active power adjustment, so that the influence of reactive power adjustment on the voltage amplitude is avoided, the residual voltage of the fault point is more accurately reduced, and the problem of residual voltage of the fault point after arc extinction in the prior art is avoided.
Description
Technical Field
The invention relates to the technical field of high-voltage distribution equipment, in particular to a fault residual voltage regulating method and system of an arc extinction device.
Background
The arc extinction device is distribution equipment applied to a high-voltage power grid, and is commonly used in 10 kV-level distribution equipment. When the high-voltage line breaks, the capacitive current in the line cannot self-extinguish, so that inductive current is required to be applied to the line for compensation, the arc extinction effect is achieved, and the running safety of the line is further improved. In general, the arc extinguishing device includes an arc extinguishing coil, a flexible arc extinguishing device, and the like.
In the prior art, there are many control schemes for arc suppression devices applied to high-voltage distribution networks. Taking a flexible arc extinction device as an example, when the device is used for carrying out fault arc extinction, the magnitude of inductive current required to be injected into the power distribution network is calculated by acquiring the ground parameter of the system, and the inductive current is input into the power distribution network to realize the arc extinction effect.
However, in the practical implementation process, the inventor finds that, due to the errors of the measurement transformer and the defects of the measurement algorithm of the earth parameters, certain errors exist in the measured earth parameters, particularly, accurate measurement of the conductance value is a difficult point, and also because the near difference of the PID regulation algorithm used by the arc extinguishing device cannot be eliminated, the fault arc extinguishing effect of the flexible arc extinguishing device is reduced, the residual voltage of the fault point cannot reach the theoretical low value, and certain potential safety hazard exists.
Disclosure of Invention
In order to solve the problems in the prior art, a fault residual voltage regulating method of an arc extinguishing device is provided, and on the other hand, a fault residual voltage regulating system of the arc extinguishing device is also provided.
The specific technical scheme is as follows:
The fault residual voltage regulating method of the arc extinguishing device is suitable for residual voltage regulation after arc extinction stabilization of the arc extinguishing device, and the voltage amplitude before regulation is collected in advance before regulation, and the fault residual voltage regulating method comprises the following steps:
step S1, acquiring voltage amplitude values of fault points, carrying out reactive power regulation according to the voltage amplitude values before regulation and the voltage amplitude values, and fixing reactive power regulation quantity after the regulation is finished;
S2, re-acquiring the voltage amplitude of the fault point, and performing active regulation on the fault point according to the voltage amplitude before regulation and the voltage amplitude;
step S3, the voltage amplitude is collected again for the fault point to be used as a new voltage amplitude before adjustment, and then the step S1 is returned to;
In the step S2, the voltage amplitude is decoupled to exclude the reactive power adjustment amount when the active power adjustment is performed.
Preferably, the step S1 includes:
Step S11, acquiring the voltage amplitude of the fault point;
step S12, reactive power adjustment is carried out on the fault point by adopting reactive power adjustment step length from a reactive power adjustment starting point;
taking a zero value as the reactive power regulation starting point in advance before the step S12 is executed for the first time;
Step S13, acquiring the voltage amplitude of the fault point, and judging whether the voltage amplitude is smaller than the voltage amplitude before adjustment;
If yes, taking the current reactive power adjustment quantity as a new reactive power adjustment starting point, and then returning to the step S12;
If not, recording the reactive adjustment amount of the reactive adjustment and maintaining the reactive adjustment amount, and then turning to the step S2.
Preferably, the method for collecting the voltage amplitude before adjustment includes:
a1, voltage acquisition is carried out on the fault point to obtain a voltage value;
And A2, calculating the voltage value by adopting a half-wave Fourier method to obtain the voltage amplitude before adjustment.
Preferably, the step S2 includes:
step S21, re-measuring the voltage amplitude value of the fault point;
step S22, acquiring the voltage amplitude of the fault point, and performing active adjustment on the fault point by adopting an active adjustment step length from an active adjustment starting point;
Taking a zero value as the active adjustment starting point in advance before the step S22 is executed for the first time;
step S23, acquiring the voltage amplitude of the fault point, and judging whether the voltage amplitude is smaller than the voltage amplitude before adjustment;
If yes, taking the current active adjustment quantity as a new active adjustment starting point, and then returning to the step S22;
If not, the residual pressure adjustment is finished.
Preferably, the generating method of the reactive power adjustment step length includes:
Step B1, acquiring the voltage amplitude, and carrying out reactive power adjustment on the voltage amplitude according to the reactive power adjustment step length;
step B2, judging whether the reactive power regulation process is over-regulated or not;
If yes, reducing the reactive power adjustment step length, and then returning to the step B1;
if not, turning to the step B3;
and B3, increasing the reactive power adjustment step length, returning to the step B1, and outputting the reactive power adjustment step length as the reactive power adjustment step length of the next residual voltage adjustment after the iteration condition is met.
Preferably, the method for generating the active adjustment step length includes:
Step C1, acquiring the voltage amplitude, and carrying out active adjustment on the voltage amplitude according to the active adjustment step length;
step C2, judging whether the active power adjustment process is over-adjusted or not;
If yes, reducing the active adjustment step length, and then returning to the step C1;
if not, turning to the step C3;
and step C3, increasing the active adjustment step length, returning to the step C1, and outputting the active adjustment step length as the active adjustment step length of the next residual voltage adjustment after the iteration condition is met.
The fault residual voltage regulating system of the arc extinguishing device is used for implementing the fault residual voltage regulating method and comprises the following steps:
the voltage amplitude acquisition module acquires voltage amplitude values of fault points;
The reactive power adjusting module is connected with the voltage amplitude obtaining module and is used for carrying out reactive power adjustment on the fault point according to the voltage amplitude;
The active adjusting module is connected with the voltage amplitude acquisition module and the reactive adjusting module, and the active adjusting module performs active adjustment on the fault point according to the voltage amplitude on the basis of reactive adjustment.
Preferably, the voltage amplitude acquisition module includes:
the voltage detection submodule acquires the voltage value of the fault point;
The amplitude generation submodule is connected with the voltage detection submodule, and the amplitude generation submodule carries out half-wave Fourier transform according to the voltage value to obtain the voltage amplitude.
Preferably, the reactive power regulation module comprises:
the first storage sub-module is used for storing the voltage amplitude before adjustment and the reactive power adjustment step length after the last adjustment;
The first regulation submodule is connected with the first storage submodule, and the first regulation submodule carries out reactive regulation on the fault point according to the reactive regulation step length;
And the first judging submodule judges whether the voltage amplitude is larger than the voltage amplitude before adjustment, records reactive power adjustment quantity and ends the reactive power adjustment process when the voltage amplitude is larger than the voltage amplitude before adjustment.
Preferably, the active power adjustment module includes:
the second storage sub-module is used for storing the voltage amplitude before adjustment and the active adjustment step length after the last adjustment;
The second regulation submodule is connected with the second storage submodule, and the second regulation submodule carries out active regulation on the fault point according to the active regulation step length;
And the second judging sub-module judges whether the voltage amplitude is larger than the voltage amplitude before adjustment, and ends the active adjustment process when the voltage amplitude is larger than the voltage amplitude before adjustment.
The technical scheme has the advantages that the residual voltage of the fault point is re-detected after arc extinction, reactive power adjustment and active power adjustment are carried out on the fault point in a time-sharing mode, and the voltage amplitude is decoupled during the active power adjustment, so that the influence of reactive power adjustment on the voltage amplitude is avoided, the residual voltage of the fault point is more accurately reduced, and the problem that the residual voltage exists at the fault point after arc extinction in the prior art is avoided.
Drawings
Embodiments of the present invention will now be described more fully with reference to the accompanying drawings. The drawings, however, are for illustration and description only and are not intended as a definition of the limits of the invention.
FIG. 1 is a schematic diagram of a residual pressure regulating method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the substep of step S1 in the embodiment of the invention;
FIG. 3 is a schematic diagram of an acquisition method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the sub-steps of step S2 in the embodiment of the invention;
FIG. 5 is a schematic diagram of a reactive power adjustment step size generation method in an embodiment of the present invention;
FIG. 6 is a schematic diagram of an active adjustment step size generation method according to an embodiment of the present invention;
Fig. 7 is a schematic diagram of a residual pressure regulating system according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
The invention comprises the following steps:
the fault residual voltage regulating method for the arc extinguishing device is suitable for residual voltage regulation of the arc extinguishing device after arc extinction stabilization, and as shown in fig. 1, and comprises the following steps:
Step S1, acquiring voltage amplitude values of fault points, carrying out reactive power regulation according to the voltage amplitude values before regulation and the voltage amplitude values, and fixing reactive power regulation quantity after the regulation is finished;
step S2, re-acquiring the voltage amplitude of the fault point, and performing active regulation on the fault point according to the voltage amplitude before regulation and the voltage amplitude;
Step S3, the voltage amplitude is collected again for the fault point to be used as a new voltage amplitude before adjustment, and then the step S1 is returned;
In step S2, during active adjustment, the voltage amplitude is decoupled to exclude the reactive adjustment.
Specifically, aiming at the problem that residual voltage still exists at a fault point after the arc extinction of the arc extinction device in the prior art, in the embodiment, the voltage amplitude is measured again at the fault point, and a reactive power regulation process and an active power regulation process which are sequentially carried out on the fault point are adopted based on the voltage amplitude, so that the residual voltage at the fault point is accurately reduced, and a good residual voltage regulation effect is achieved.
Further, in the residual voltage adjusting process, the reactive power adjusting process and the active power adjusting process which are carried out in a time-sharing mode are split into the reactive power adjusting process and the active power adjusting process, the collected output quantity is decoupled during adjusting, the reactive power adjusting quantity and the active power adjusting quantity are split into the reactive power adjusting quantity and the active power adjusting quantity, the reactive power adjusting quantity is kept unchanged during active power adjusting, and only the influence of the active power adjusting quantity on a power grid is considered, so that the rapid adjusting process is achieved.
In practice, the method described above is provided as a software embodiment in an arc suppression device or other power distribution apparatus. The fault point is assigned to a section of the power grid where a broken line fault exists, and the voltage amplitude can be obtained by measuring and calculating the real-time voltage based on the sensor. Depending on the chosen calculation method, the length of the single adjustment period will vary accordingly. For example, when the full wave fourier method is used to calculate the voltage amplitude from the real-time voltage, the regulation period of a single execution of the reactive regulation process or the active regulation process is typically 20ms or more, and the total regulation period of a single execution is 40ms or more. When the voltage amplitude is calculated according to the real-time voltage by adopting the half-wave Fourier method, the regulation period of a single reactive regulation process or an active regulation process is usually more than 10ms, and the total regulation period of a single time is more than 20 ms. In each active or reactive power regulation process, a real-time voltage value is acquired for the fault point, the voltage amplitude of the fault point is calculated according to the real-time voltage value, and then the active or reactive power regulation is continued. After the arc extinction device is finished, reactive power regulation and active power regulation processes of a plurality of periods are continuously carried out on the fault point by adopting the method, so that residual voltage of the fault point is eliminated step by step, and the problem that residual voltage exists in the fault point is avoided.
In a preferred embodiment, the pre-regulation voltage amplitude is collected in advance before arc extinction, as shown in fig. 2, step S1 includes:
step S11, obtaining voltage amplitude values of fault points;
Step S12, reactive power adjustment is carried out on the fault point by adopting reactive power adjustment step length from a reactive power adjustment starting point;
Before the first execution of step S12, a zero value is taken as a reactive power regulation starting point in advance;
step S13, acquiring voltage amplitude of a fault point, and judging whether the voltage amplitude is smaller than the voltage amplitude before adjustment;
if yes, taking the current reactive power adjustment quantity as a new reactive power adjustment starting point, and then returning to the step S12;
if not, the reactive adjustment amount of the reactive adjustment is recorded and maintained, and then the process goes to step S2.
Specifically, aiming at the problem that residual voltage still exists at a fault point after the arc extinction of the arc extinction device in the prior art, in the embodiment, the reactive power adjustment process is carried out by collecting and recording the voltage amplitude before adjustment in the previous period in advance before the arc extinction and inputting reactive power to the fault point step by step according to the voltage amplitude before adjustment and the reactive power adjustment step length. In the process, the reactive power regulation is finished when the voltage amplitude is larger than or equal to the voltage amplitude before regulation by recalculating the voltage amplitude after reactive power regulation is performed each time and comparing the voltage amplitude with the voltage amplitude before regulation, so that a better regulation effect is realized.
In a preferred embodiment, as shown in fig. 3, the method for acquiring the adjusted front voltage amplitude includes:
A1, voltage acquisition is carried out on fault points after the last adjustment is finished to obtain voltage values;
And A2, calculating the voltage value by adopting a half-wave Fourier method to obtain the voltage amplitude before adjustment.
Specifically, in order to achieve a better real-time adjustment effect, in the embodiment, the voltage value is acquired for the fault point in the process of acquiring the voltage amplitude, and the voltage value is calculated by combining a half-wave Fourier method to obtain the voltage amplitude, so that a calculation speed higher than that of a traditional full-wave Fourier method is achieved, and the accuracy is enough to meet the adjustment requirement.
The above process, when implemented, is embodied asWherein U Amp is the voltage amplitude, a n is the real part, b n is the imaginary part, K is the sampling frequency, and U (i) is the voltage value at the current time. The above calculation process may be used in the process of re-measuring the fault point to obtain the voltage amplitude during reactive power adjustment and active power adjustment, that is, after measuring the fault point to obtain the real-time voltage value, the voltage amplitude is calculated by using the above calculation method, which is not limited herein.
In a preferred embodiment, as shown in fig. 4, step S2 includes:
S21, re-measuring the voltage amplitude of the fault point;
Step S22, obtaining the voltage amplitude of the fault point, and performing active adjustment on the fault point by adopting an active adjustment step length from an active adjustment starting point;
Before the first execution of step S22, a zero value is taken as an active adjustment starting point in advance;
Step S23, obtaining the voltage amplitude of the fault point, and judging whether the voltage amplitude is smaller than the voltage amplitude before adjustment;
if yes, taking the current active adjustment quantity as a new active adjustment starting point, and then returning to the step S22;
If not, the residual pressure adjustment is finished.
Specifically, in the embodiment, the voltage amplitude before adjustment of the previous period is collected and recorded in advance before arc extinction, and active power is input to the fault point step by step according to the voltage amplitude before adjustment and the active adjustment step length to perform an active adjustment process. In the process, the voltage amplitude is recalculated after each active adjustment, and the voltage amplitude is compared with the voltage amplitude before adjustment, and the active adjustment is finished when the voltage amplitude is more than or equal to the voltage amplitude before adjustment, so that a better adjustment effect is realized.
Further, in the foregoing step, since the reactive adjustment amount remains unchanged after the reactive adjustment process is ended, the output voltage amplitude can be decoupled for active adjustment alone during the active adjustment process, irrespective of the influence of the reactive adjustment amount, thereby realizing a faster processing speed.
In a preferred embodiment, as shown in fig. 5, the method for generating the reactive power adjustment step size includes:
Step B1, obtaining a voltage amplitude, and performing reactive power adjustment on the voltage amplitude according to reactive power adjustment step length;
step B2, judging whether the reactive power regulation process is over-regulated or not;
If yes, reducing the reactive power regulation step length, and then returning to the step B1;
if not, turning to the step B3;
And B3, increasing the reactive power adjustment step length, returning to the step B1, and outputting the reactive power adjustment step length as the reactive power adjustment step length of the next residual voltage adjustment after the iteration condition is met.
Specifically, considering that when the reactive power adjustment is performed by relying on the negative feedback method in the reactive power adjustment process, the adjustment step length is in direct proportion to the overall adjustment speed and in inverse proportion to the adjustment effect, in this embodiment, after the last adjustment, the reactive power adjustment is performed for a plurality of times based on the voltage amplitude, the reactive power adjustment step length is gradually increased in the reactive power adjustment simulation process, and whether an over-adjustment phenomenon occurs is judged after each adjustment, so that the iterative process of the reactive power adjustment step length is realized, and the problem that the over-adjustment phenomenon affects the adjustment effect is avoided while the adjustment speed is ensured.
In a preferred embodiment, as shown in fig. 6, the method for generating the active adjustment step size includes:
Step C1, acquiring a voltage amplitude, and performing active adjustment on the voltage amplitude according to an active adjustment step length;
step C2, judging whether the active power adjustment process is over-adjusted or not;
If yes, reducing the active adjustment step length, and then returning to the step C1;
if not, turning to the step C3;
and step C3, increasing the active adjustment step length, returning to the step C1, and outputting the active adjustment step length as the active adjustment step length of the next residual pressure adjustment after the iteration condition is met.
Specifically, considering that in the active adjustment process, when the active adjustment is performed by relying on the negative feedback method, the adjustment step length is directly proportional to the overall adjustment speed and inversely proportional to the adjustment effect, in this embodiment, after the last adjustment, the active adjustment step length is gradually increased in the active adjustment simulation process by performing multiple times of simulation based on the voltage amplitude, and whether an over-adjustment phenomenon occurs is judged after each adjustment, so that the iteration process of the active adjustment step length is realized, and the problem that the adjustment effect is influenced by the over-adjustment phenomenon is avoided while the adjustment speed is ensured.
A fault residual voltage regulating system of an arc extinguishing device for implementing the above fault residual voltage regulating method, as shown in fig. 7, includes:
the voltage amplitude acquisition module 1 is used for acquiring voltage amplitude values of fault points;
The reactive power regulation module 2 is connected with the voltage amplitude acquisition module 1, and the reactive power regulation module performs reactive power regulation on the fault point according to the voltage amplitude;
The active regulation module 3, the active regulation module 3 connects the voltage amplitude acquisition module 1 and the reactive regulation module 2, and the active regulation module 3 carries out active regulation on fault points according to the voltage amplitude on the basis of reactive regulation.
Specifically, aiming at the problem that residual voltage still exists at the fault point after the arc extinction of the arc extinction device in the prior art, in the embodiment, the voltage amplitude is re-measured for the fault point by adopting the voltage amplitude acquisition module 1, and reactive power adjustment and active power adjustment are sequentially carried out on the fault point by adopting the reactive power adjustment module 2 and the active power adjustment module 3 based on the voltage amplitude, so that the residual voltage at the fault point is accurately reduced, and a good residual voltage adjustment effect is realized.
Further, in the residual voltage adjusting process, the reactive power adjusting process and the active power adjusting process which are performed in a time-sharing manner are split into the adjusting process, and the reactive power adjusting module 2 and the active power adjusting module 3 are respectively adopted to perform the adjusting process according to the voltage amplitude obtained by the voltage amplitude obtaining module 1. Wherein, reactive power regulation module 2 keeps reactive power regulation volume unchanged after having accomplished reactive power regulation. The active regulating module 3 decouples the collected output quantity during regulation, splits the output quantity into reactive regulating quantity and active regulating quantity, keeps the reactive regulating quantity unchanged during active regulation, only considers the influence of the active regulating quantity on a power grid, and therefore a rapid regulation process is realized.
In a preferred embodiment, the voltage amplitude acquisition module 1 comprises:
the voltage detection sub-module 11, the voltage detection sub-module 11 obtains the voltage value of the fault point;
the amplitude generation sub-module 12, the amplitude generation sub-module 12 is connected with the voltage detection sub-module 11, and the amplitude generation sub-module 11 performs half-wave Fourier transform according to the voltage value to obtain the voltage amplitude.
Specifically, in order to achieve a better real-time adjustment effect, in this embodiment, in the process of collecting the voltage amplitude, the voltage detection sub-module 11 is used to collect the real-time voltage value for the fault point, and then the amplitude generation sub-module 12 calculates the voltage value based on the half-wave fourier method to obtain the voltage amplitude, so that a calculation speed faster than that of the traditional full-wave fourier method is achieved, and the accuracy is enough to meet the adjustment requirement.
In a preferred embodiment, the reactive power regulation module 2 comprises:
The first storage sub-module 21 stores the voltage amplitude before adjustment and the reactive power adjustment step length after the last adjustment in the first storage sub-module 21;
The first regulation sub-module 22 is connected with the first storage sub-module 21, and the first regulation sub-module 22 performs reactive regulation on the fault point according to the reactive regulation step length;
The first judging sub-module 23, the first judging sub-module 23 judges whether the voltage amplitude is larger than the voltage amplitude before the adjustment, and records the reactive power adjustment amount and ends the reactive power adjustment process when the voltage amplitude is larger than the voltage amplitude before the adjustment.
Specifically, in the embodiment, the first storage sub-module 21 is used to record the voltage amplitude before the regulation of the previous period before the arc extinction, and the first regulation sub-module 22 is used to input reactive power to the fault point step by step according to the voltage amplitude before the regulation and the reactive regulation step length to perform the reactive regulation process. In this process, the voltage amplitude is recalculated after each reactive power adjustment, and the voltage amplitude is compared with the voltage amplitude before adjustment by adopting the first judging submodule 23, and when the voltage amplitude is greater than or equal to the voltage amplitude before adjustment, the reactive power adjustment is finished, so that a better adjustment effect is achieved.
In a preferred embodiment, the active conditioning module 3 comprises:
the second storage sub-module 31 stores the voltage amplitude before adjustment and the active adjustment step length after the last adjustment in the second storage sub-module 31;
The second regulation sub-module 32, the second regulation sub-module 32 is connected with the second storage sub-module 31, and the second regulation sub-module 32 carries out active regulation on the fault point according to the active regulation step length;
The second judging sub-module 33, the second judging sub-module 33 judges whether the voltage amplitude is greater than the voltage amplitude before the adjustment, and ends the active adjustment process when the voltage amplitude is greater than the voltage amplitude before the adjustment.
Specifically, in the embodiment, the second storage sub-module 31 is adopted to record the voltage amplitude before the regulation of the previous period before the arc extinction, and the second regulation sub-module 32 is adopted to input the active power to the fault point step by step according to the voltage amplitude before the regulation and the active regulation step length to perform the active regulation process. In this process, by recalculating the voltage amplitude after each active adjustment, and comparing the voltage amplitude with the voltage amplitude before adjustment using the second determination sub-module 33, the end of the active adjustment is indicated when the voltage amplitude is equal to or greater than the voltage amplitude before adjustment, thereby achieving a better adjustment effect.
The invention has the beneficial effects that the residual voltage of the fault point is re-detected after arc extinction, reactive power adjustment and active power adjustment are carried out on the fault point in a time-sharing manner, and the voltage amplitude is decoupled during the active power adjustment, so that the influence of reactive power adjustment on the voltage amplitude is avoided, the residual voltage of the fault point is more accurately reduced, and the problem of residual voltage of the fault point after arc extinction in the prior art is avoided.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included in the scope of the present invention.
Claims (8)
1. The fault residual voltage regulating method of the arc extinguishing device is suitable for residual voltage regulation after arc extinction stabilization of the arc extinguishing device, and is characterized in that the voltage amplitude before regulation is collected to a fault point in advance before regulation, and the fault residual voltage regulating method comprises the following steps:
Step S1, acquiring voltage amplitude values of fault points, performing reactive power adjustment according to the voltage amplitude values before adjustment and the current voltage amplitude values, and fixing reactive power adjustment quantity after adjustment is finished;
S2, re-acquiring the current voltage amplitude of the fault point, and performing active regulation on the fault point according to the voltage amplitude before regulation and the voltage amplitude;
Step S3, the current voltage amplitude is collected again for the fault point to be used as a new voltage amplitude before adjustment, and then the step S1 is returned to;
in the step S2, when the active adjustment is performed, decoupling is performed on the current voltage amplitude so as to exclude the reactive adjustment amount;
The step S1 includes:
Step S11, obtaining the voltage amplitude of the fault point;
step S12, reactive power adjustment is carried out on the fault point by adopting reactive power adjustment step length from a reactive power adjustment starting point;
taking a zero value as the reactive power regulation starting point in advance before the step S12 is executed for the first time;
step S13, acquiring the current voltage amplitude of the fault point, and judging whether the current voltage amplitude is smaller than the voltage amplitude before adjustment;
If yes, taking the current reactive power adjustment quantity as a new reactive power adjustment starting point, and then returning to the step S12;
If not, recording the reactive power adjustment quantity of the reactive power adjustment and maintaining the reactive power adjustment quantity, and then turning to the step S2;
The step S2 includes:
S21, re-measuring the voltage amplitude of the fault point;
step S22, acquiring the current voltage amplitude of the fault point, and performing active adjustment on the fault point by adopting an active adjustment step length from an active adjustment starting point;
Taking a zero value as the active adjustment starting point in advance before the step S22 is executed for the first time;
Step S23, acquiring the current voltage amplitude of the fault point, and judging whether the current voltage amplitude is smaller than the voltage amplitude before adjustment;
if yes, taking the current active adjustment quantity as a new active adjustment starting point, and then returning to the step S22;
If not, the residual pressure adjustment is finished.
2. The fault residual voltage regulation method according to claim 1, wherein the method for acquiring the voltage amplitude before regulation comprises:
a1, voltage acquisition is carried out on the fault point to obtain a voltage value;
And A2, calculating the voltage value by adopting a half-wave Fourier method to obtain the voltage amplitude before adjustment.
3. The fault residual voltage regulation method according to claim 1, wherein the reactive power regulation step size generation method comprises:
step B1, acquiring a current voltage amplitude, and carrying out reactive power adjustment on the current voltage amplitude according to the reactive power adjustment step length;
step B2, judging whether the reactive power regulation process is over-regulated or not;
If yes, reducing the reactive power adjustment step length, and then returning to the step B1;
if not, turning to the step B3;
and B3, increasing the reactive power adjustment step length, returning to the step B1, and outputting the reactive power adjustment step length as the reactive power adjustment step length of the next residual voltage adjustment after the iteration condition is met.
4. The fault residual voltage regulation method according to claim 1, wherein the active regulation step size generation method comprises:
step C1, acquiring a current voltage amplitude, and carrying out active adjustment on the current voltage amplitude according to the active adjustment step length;
step C2, judging whether the active power adjustment process is over-adjusted or not;
If yes, reducing the active adjustment step length, and then returning to the step C1;
if not, turning to the step C3;
and step C3, increasing the active adjustment step length, returning to the step C1, and outputting the active adjustment step length as the active adjustment step length of the next residual voltage adjustment after the iteration condition is met.
5. A fault residual pressure regulating system for an arc extinguishing device, characterized by being adapted to implement the fault residual pressure regulating method as claimed in any one of claims 1-4, comprising:
the voltage amplitude acquisition module acquires voltage amplitude values of fault points;
The reactive power adjusting module is connected with the voltage amplitude obtaining module and is used for carrying out reactive power adjustment on the fault point according to the current voltage amplitude;
The active regulation module is connected with the voltage amplitude acquisition module and the reactive regulation module, and the active regulation module carries out active regulation on the fault point according to the current voltage amplitude on the basis of reactive regulation.
6. The fault residual voltage regulation system of claim 5, wherein the voltage amplitude acquisition module comprises:
the voltage detection submodule acquires the voltage value of the fault point;
The amplitude generation submodule is connected with the voltage detection submodule, and the amplitude generation submodule carries out half-wave Fourier transform according to the voltage value to obtain the current voltage amplitude.
7. The fault residual voltage regulation system of claim 5, wherein the reactive regulation module includes:
the first storage sub-module is used for storing the voltage amplitude before adjustment and the reactive power adjustment step length after the last adjustment;
The first regulation submodule is connected with the first storage submodule, and the first regulation submodule carries out reactive regulation on the fault point according to the reactive regulation step length;
the first judging submodule judges whether the current voltage amplitude is larger than the voltage amplitude before adjustment, and records reactive power adjustment quantity and ends the reactive power adjustment process when the current voltage amplitude is larger than the voltage amplitude before adjustment.
8. The fault residual voltage regulation system of claim 5, wherein the active regulation module includes:
the second storage sub-module is used for storing the voltage amplitude before adjustment and the active adjustment step length after the last adjustment;
The second regulation submodule is connected with the second storage submodule, and the second regulation submodule carries out active regulation on the fault point according to the active regulation step length;
And the second judging sub-module judges whether the current voltage amplitude is larger than the voltage amplitude before adjustment, and ends the active adjustment process when the current voltage amplitude is larger than the voltage amplitude before adjustment.
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