CN113258563A - Method and device for determining relay protection sensitivity of alternating current power grid accessed by flexible direct island - Google Patents
Method and device for determining relay protection sensitivity of alternating current power grid accessed by flexible direct island Download PDFInfo
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- CN113258563A CN113258563A CN202110460220.2A CN202110460220A CN113258563A CN 113258563 A CN113258563 A CN 113258563A CN 202110460220 A CN202110460220 A CN 202110460220A CN 113258563 A CN113258563 A CN 113258563A
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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
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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
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention discloses a method and a device for determining relay protection sensitivity of an alternating current power grid accessed by a flexible direct island, wherein the method comprises the following steps: performing time domain simulation on the alternating current power grid fault accessed to the flexible direct island to obtain a short-circuit current matrix; performing fast Fourier decomposition processing on the short-circuit current matrix, and extracting a time-domain-based short-circuit current fundamental wave effective value; according to the short-circuit current fundamental wave effective value and the protection constant value, a relay protection action value matrix based on a time domain is obtained; obtaining a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix; analyzing the relay protection sensitivity in the protection action time after the fault occurs; and if the relay protection sensitivity in the protection action time does not meet the protection action delay requirement, modifying the protection fixed value and recalculating. According to the invention, time domain simulation is carried out on the alternating current power grid fault accessed to the flexible and direct island, the relay protection sensitivity is calculated according to the simulation result, and the protection action performance of the relay protection device is effectively evaluated.
Description
Technical Field
The invention relates to the field of electric power, in particular to a method and a device for determining relay protection sensitivity of an alternating current power grid accessed by a flexible direct island.
Background
This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
The flexible direct current island access means that a power grid voltage is established by a flexible direct current converter, no other synchronous machine exists, new energy and the flexible direct current converter are all sources of short-circuit current of a power grid of the flexible direct current island, and in short-circuit analysis, equipment current limit and rapid dynamic characteristics of the converter must be considered; the relay protection sensitivity is a margin of a correct operation capability of the protection device when a fault occurs in a protected range of the equipment or the line. The protection with increased electric quantity is reflected, and the sensitivity is the ratio of the minimum short circuit parameter of the attribute short circuit in the protection area to the protection action parameter; the sensitivity is the ratio of the protection action parameter to the maximum short circuit parameter of the attribute short circuit in the protection area.
When the flexible direct island is connected to an alternating current power grid, due to the special power grid structure and the complex electromagnetic transient characteristic of the flexible direct island power grid, the relay protection characteristic originally used for the alternating current power grid is inconsistent with the original design thought. The new energy power supply needs to be connected to the grid through a power electronic device, the fault current amplitude of the new energy power supply is limited, the phase angle is controlled, the harmonic content is high, the waveform nonlinearity is strong, and the new energy power supply is obviously different from the traditional synchronous power supply. Aiming at a novel flexible direct island power grid of a new energy feed-in flexible direct current converter station, how to calculate the response capability of relay protection on faults in the power grid and evaluate the sensitivity of the relay protection is not formed into a mature research result.
An alternating current power grid connected to a flexible direct island cannot calculate short-circuit current through system impedance, and the magnitude of the short-circuit current is difficult to obtain by adopting a traditional calculation method and sensitivity calculation is performed on a protection constant value. Due to the current limiting control effect of the flexible-straight system, the short-circuit current is characterized in that the short-circuit current is rapidly increased in the initial fault time period, rapidly decreased after being increased for a short time, and finally enters a stable state, and the amplitude fluctuation of the transient process before entering the stable state is extremely large. In the traditional calculation method, the steady-state short-circuit current is calculated through the system impedance, and the sensitivity is calculated according to the ratio of the steady-state short-circuit current to the protection constant value. The alternating current power grid adopts a full-line quick-acting relay protection device, the action speed is high, and the action is finished before the short-circuit current enters a steady state to remove faults. The actual current magnitude during the protection action cannot be verified by adopting the steady-state current to calculate the sensitivity, and the performance of the protection action cannot be effectively evaluated. Therefore, for an alternating current power grid accessed to the flexible direct island, the traditional sensitivity calculation method cannot meet the actual requirement.
The prior art provides a method for calculating sensitivity of reliability influence factors of a power system, which includes: selecting N links in a neural network of the reliability index, wherein the links meet the following conditions: selecting a neuron in each layer of the neural network to form a link, wherein the selected neurons are directly connected layer by layer; and respectively calculating the sensitivity index of a certain influence factor in each link, and calculating the average value of the sensitivity indexes of all the links as the sensitivity of the influence factor to the reliability index. The influence factors can be effectively distinguished into favorable factors and unfavorable factors through a simulation experiment of actual data, and the sensitivity importance degrees of the influence factors with the same property are quantitatively sequenced according to the sensitivity contribution to the given indexes. The sensitivity calculation aimed at by the technology is in the field of reliable operation of the device, aims to calculate the influence of the reliability of elements and other factors of the device on the device under the normal operation condition, and cannot be applied to determining the relay protection sensitivity of the alternating current power grid accessed to the flexible and direct isolated island.
The prior art also provides a method for improving the sensitivity of the differential protection of the transformer, which utilizes a transformer differential protection fault discrimination program to collect the current and the voltage of each side of the transformer through a current transformer and a voltage transformer, then multiplies the current of each side by a current balance coefficient calculated according to the actual voltage, the rated capacity of the transformer and the CT transformation ratio to carry out conversion, then carries out differential flow calculation of the transformer, then carries out judgment on differential flow action conditions, sends out a transformer tripping command and sends out alarm information when the conditions are met, and otherwise exits the fault discrimination program. The method is still based on the traditional alternating current system, does not consider the limited characteristic and the time-varying characteristic of the short-circuit current of the flexible direct island system, and is not suitable for the flexible direct island system.
Disclosure of Invention
The embodiment of the invention provides a method for determining relay protection sensitivity of an alternating current power grid accessed by a flexible direct island, which is used for effectively evaluating the relay protection sensitivity of the alternating current power grid accessed by the flexible direct island, and comprises the following steps:
performing time domain simulation on the alternating current power grid fault accessed to the flexible direct island to obtain a short-circuit current matrix;
performing fast Fourier decomposition processing on the short-circuit current matrix, and extracting a time-domain-based short-circuit current fundamental wave effective value;
and circularly executing the following steps until the relay protection sensitivity in the protection action time meets the protection action delay requirement:
according to the short-circuit current fundamental wave effective value and the protection constant value, a relay protection action value matrix based on a time domain is obtained;
obtaining a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix;
analyzing the relay protection sensitivity within the protection action time after the fault occurs according to the relay protection sensitivity matrix;
and if the relay protection sensitivity in the protection action time does not meet the protection action delay requirement, modifying the protection fixed value.
In an embodiment, analyzing the relay protection sensitivity in the protection action time after the fault occurs according to the relay protection sensitivity matrix may include:
determining a time point meeting the relay protection sensitivity requirement according to the relay protection sensitivity requirement;
searching a sensitivity maximum value point of a relay protection sensitivity matrix;
searching from the sensitivity maximum point to the fault starting time point, finishing searching to the last time point meeting the relay protection sensitivity requirement, and recording the time point as the first end point of the continuous time window meeting the relay protection sensitivity requirement;
searching from the sensitivity maximum point to the fault ending time point, ending after the last time point meeting the relay protection sensitivity requirement or exceeding the protection action time point is searched, and recording the point as a second endpoint of a continuous time window meeting the relay protection sensitivity requirement;
and determining the time difference between the first end point and the second end point as a continuous time window meeting the relay protection sensitivity requirement.
In an embodiment, after determining the continuous time window meeting the relay protection sensitivity requirement, determining whether the relay protection sensitivity within the protection action time meets the protection action delay requirement according to the following manner:
comparing the duration of the continuous time window meeting the relay protection sensitivity requirement with the protection action delay of the relay protection device;
if the duration of the continuous time window meeting the relay protection sensitivity requirement is greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the duration of the continuous time window meeting the relay protection sensitivity requirement is not greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
In an embodiment, analyzing the relay protection sensitivity in the protection action time after the fault occurs according to the relay protection sensitivity matrix may further include:
setting a time window length corresponding to the protection action delay according to the protection action delay of the relay protection device;
comparing the relay protection sensitivity of the left end point and the right end point of a time window corresponding to the protection action delay from the fault starting time point;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is smaller than that of the right side, continuing to search downwards;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is not smaller than that of the right side, stopping searching, and recording the time of the left end point and the right end point of the time window corresponding to the protection action delay at the moment;
and calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at the moment.
In an embodiment, after calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at this time, determining whether the relay protection sensitivity in the protection action time meets the protection action delay requirement according to the following manner:
comparing whether the minimum value of the relay protection sensitivity in a time window corresponding to the protection action delay is greater than the relay protection sensitivity meeting the relay protection sensitivity requirement;
if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is larger than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is not more than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
Another embodiment of the present invention further provides a device for determining a relay protection sensitivity of an ac power grid accessed by a flexible direct island, which is used to effectively evaluate the relay protection sensitivity of the ac power grid accessed by the flexible direct island, and the device includes:
the short-circuit current matrix obtaining module is used for carrying out time domain simulation on the alternating current power grid fault accessed to the flexible direct island to obtain a short-circuit current matrix;
the short-circuit current processing module is used for performing fast Fourier decomposition processing on the short-circuit current matrix and extracting a time-domain-based short-circuit current fundamental wave effective value;
the relay protection action value calculation module is used for obtaining a relay protection action value matrix based on a time domain according to the short-circuit current fundamental wave effective value and the protection constant value;
the relay protection sensitivity matrix obtaining module is used for obtaining a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix;
the relay protection sensitivity analysis module is used for analyzing the relay protection sensitivity in the protection action time after the fault occurs according to the relay protection sensitivity matrix;
and the protection constant value modification module is used for modifying the protection constant value when the relay protection sensitivity in the protection action time does not meet the protection action delay requirement, and re-triggering the relay protection action value calculation module, the relay protection sensitivity matrix acquisition module and the relay protection sensitivity analysis module to execute.
In an embodiment, the short circuit current matrix obtaining module is specifically configured to:
and performing time domain simulation on the alternating current power grid fault accessed to the flexible and direct island by adopting electromagnetic transient simulation software to obtain a short-circuit current matrix.
In an embodiment, the relay protection sensitivity analysis module is specifically configured to:
determining a time point meeting the relay protection sensitivity requirement according to the relay protection sensitivity requirement;
searching a sensitivity maximum value point of a relay protection sensitivity matrix;
searching from the sensitivity maximum point to the fault starting time point, finishing searching to the last time point meeting the relay protection sensitivity requirement, and recording the time point as the first end point of the continuous time window meeting the relay protection sensitivity requirement;
searching from the sensitivity maximum point to the fault ending time point, ending after the last time point meeting the relay protection sensitivity requirement or exceeding the protection action time point is searched, and recording the point as a second endpoint of a continuous time window meeting the relay protection sensitivity requirement;
and determining the time difference between the first end point and the second end point as a continuous time window meeting the relay protection sensitivity requirement.
In an embodiment, the apparatus further includes a first relay protection sensitivity determination module, configured to:
comparing the duration of the continuous time window meeting the relay protection sensitivity requirement with the protection action delay of the relay protection device;
if the duration of the continuous time window meeting the relay protection sensitivity requirement is greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the duration of the continuous time window meeting the relay protection sensitivity requirement is not greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
In an embodiment, the relay protection sensitivity analysis module is specifically configured to:
setting a time window length corresponding to the protection action delay according to the protection action delay of the relay protection device;
comparing the relay protection sensitivity of the left end point and the right end point of a time window corresponding to the protection action delay from the fault starting time point;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is smaller than that of the right side, continuing to search downwards;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is not smaller than that of the right side, stopping searching, and recording the time of the left end point and the right end point of the time window corresponding to the protection action delay at the moment;
and calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at the moment.
In an embodiment, the apparatus further includes a second relay protection sensitivity determination module, configured to:
comparing whether the minimum value of the relay protection sensitivity in a time window corresponding to the protection action delay is greater than the relay protection sensitivity meeting the relay protection sensitivity requirement;
if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is larger than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is not more than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
The embodiment of the invention also provides computer equipment which comprises a memory, a processor and a computer program which is stored on the memory and can be run on the processor, wherein the processor realizes the relay protection sensitivity calculation method of the AC power grid accessed by the flexible direct isolated island when executing the computer program.
The embodiment of the invention also provides a computer readable storage medium, which stores a computer program for executing the method for calculating the relay protection sensitivity of the alternating current power grid accessed by any one of the flexible direct island.
In the embodiment of the invention, time domain simulation is carried out on the alternating current power grid fault accessed to the flexible direct island to obtain a short-circuit current matrix; performing fast Fourier decomposition processing on the short-circuit current matrix, and extracting a time-domain-based short-circuit current fundamental wave effective value; and circularly executing the following steps until the relay protection sensitivity in the protection action time meets the protection action delay requirement: according to the short-circuit current fundamental wave effective value and the protection constant value, a relay protection action value matrix based on a time domain is obtained; obtaining a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix; analyzing the relay protection sensitivity within the protection action time after the fault occurs according to the relay protection sensitivity matrix; and if the relay protection sensitivity in the protection action time does not meet the protection action delay requirement, modifying the protection fixed value. In the prior art, for an alternating current power grid connected to a flexible and direct island, short-circuit current cannot be calculated through system impedance, relay protection sensitivity calculation of a protection constant value is difficult to perform by adopting a traditional calculation method, and effective evaluation is performed on protection action performance of a relay protection device; the embodiment of the invention can perform time domain simulation on the alternating current power grid fault accessed by the flexible direct island, perform data processing on the short-circuit current obtained by simulation, calculate the relay protection sensitivity by combining the protection fixed value and effectively evaluate the protection action performance of the relay protection device, and can improve the accuracy of the relay protection sensitivity of the alternating current power grid accessed by the flexible direct island.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a system structure diagram of a flexible direct island access ac power grid in an embodiment of the present invention;
fig. 2 is a characteristic waveform diagram of an effective value of a short-circuit current fundamental wave of an ac power grid connected to a flexible direct island in the embodiment of the present invention;
fig. 3 is a processing flow chart of a method for determining relay protection sensitivity of an ac power grid accessed by a flexible-direct island in an embodiment of the present invention;
fig. 4 is a flowchart illustrating an embodiment of determining whether the relay protection sensitivity in the protection action time meets the protection action delay requirement by calculating a continuous time window meeting the protection sensitivity requirement;
fig. 5 is a flowchart illustrating an embodiment of determining whether the relay protection sensitivity in the protection action time meets the protection action delay requirement according to the protection action delay setting time window length;
fig. 6 is a schematic structural diagram of a relay protection sensitivity determination device of an ac power grid accessed by a flexible-direct island in an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a specific example of a relay protection sensitivity determination device for an ac power grid accessed by a flexible-direct island in an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another specific example of the relay protection sensitivity determination device for the ac power grid accessed by the flexible-direct island in the embodiment of the present invention;
fig. 9 is a schematic structural diagram of a computer device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are further described in detail below with reference to the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
Fig. 1 is a system structure diagram of the flexible direct island access ac power grid in the embodiment of the present invention. As shown in fig. 1, the flexible connection is an end-to-end connection or a multi-end connection, and a control method for controlling ac voltage and frequency is adopted on an island side to determine voltage and frequency for an ac system. The new energy is connected with the flexible direct current converter station through a line, and all the new energy output is sent out through the flexible direct current converter station.
Fig. 2 is a characteristic waveform diagram of an effective value of a short-circuit current fundamental wave of an ac power grid connected to a flexible direct island in the embodiment of the present invention. As shown in fig. 2, since the flexible direct current system performs amplitude limiting on the short-circuit current based on its own capacity, when the flexible direct current island is connected to the ac power grid and has a fault, the short-circuit current is characterized by rapidly increasing in an initial period of the fault, rapidly decreasing after increasing for a short time, and finally entering a steady state, and the amplitude fluctuation of the transient process before entering the steady state is very large.
In specific implementation, due to the short-circuit current characteristic of the flexible direct island accessed to the alternating current power grid, the traditional calculation method cannot be adopted to calculate the steady-state short-circuit current through the system impedance, and the relay protection sensitivity is calculated according to the steady-state short-circuit current and the protection fixed value; in addition, because the alternating current power grid adopts a relay protection device which moves at full line speed, the action speed is high, and the action fault removal is finished before the short-circuit current enters a stable state, the traditional sensitivity calculation method cannot meet the actual requirement for the alternating current power grid accessed to the flexible and direct island.
Fig. 3 is a processing flow chart of a method for determining relay protection sensitivity of an ac power grid accessed by a flexible direct island in an embodiment of the present invention. As shown in fig. 3, a method for determining relay protection sensitivity of an ac power grid accessed by a flexible direct island in an embodiment of the present invention may include:
301, performing time domain simulation on the alternating current power grid fault accessed to the flexible direct island to obtain a short-circuit current matrix;
303, acquiring a relay protection action value matrix based on a time domain according to the short-circuit current fundamental wave effective value and the protection fixed value;
304, acquiring a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix;
305, analyzing the relay protection sensitivity in the protection action time after the fault occurs according to the relay protection sensitivity matrix;
As can be known from the process shown in fig. 3, the method for determining the relay protection sensitivity of the ac power grid accessed to the flexible direct island in the embodiment of the present invention is different from the method for determining the relay protection sensitivity according to the steady-state short-circuit current and the protection fixed value in the prior art, and the embodiment of the present invention performs time domain simulation on the ac power grid fault accessed to the flexible direct island, performs data processing on the short-circuit current obtained by simulation, performs relay protection sensitivity calculation in combination with the protection fixed value, and effectively evaluates the protection performance of the relay protection device, so that the accuracy of the relay protection sensitivity of the ac power grid accessed to the flexible direct island can be improved.
During specific implementation, time domain simulation is firstly carried out on alternating current power grid faults connected to the flexible direct island, and a short-circuit current matrix is obtained. In an embodiment, electromagnetic transient simulation software can be used for performing time domain simulation on the ac power grid fault accessed by the flexible and direct isolated island. In the embodiment, time domain simulation can be performed according to different positions and various types of faults of the alternating current power grid accessed by the flexible direct island, and a short-circuit current matrix capable of reflecting the actual current magnitude when the alternating current power grid accessed by the flexible direct island fails is obtained.
And after an alternating current power grid short-circuit current matrix accessed by the flexible direct island is obtained, carrying out fast Fourier decomposition processing on the short-circuit current matrix obtained by simulation, and extracting a time-domain-based short-circuit current fundamental wave effective value. In the embodiment, the short-circuit current characteristic of the flexible direct island access is analyzed, and the characteristic is that the current is greatly increased in the initial fault time period, rapidly reduced after short-time increase and finally enters a stable state, and the characteristic conforms to the flexible direct controller principle; and carrying out fast Fourier decomposition processing on the short-circuit current matrix obtained by simulation and extracting the effective value of the short-circuit current fundamental wave to be used as a data basis of subsequent calculation.
During specific implementation, after the short-circuit current fundamental wave effective value of the alternating current power grid connected to the flexible-direct island is extracted, a relay protection action value matrix based on a time domain is obtained according to the short-circuit current fundamental wave effective value and the protection fixed value. In the embodiment, a time domain-based relay protection action value matrix can be obtained by combining data such as a related protection principle and system parameters of the relay protection device of the alternating current power grid.
In specific implementation, obtaining the time-domain-based relay protection sensitivity matrix according to the short-circuit current matrix and the relay protection action value matrix may include: and carrying out data processing on the short-circuit current matrix and the relay protection action value matrix to obtain a relay protection sensitivity matrix based on a time domain.
During specific implementation, the relay protection sensitivity in the protection action time after the fault occurs is analyzed according to the relay protection sensitivity matrix. Because the flexible direct system carries out amplitude limiting on the short-circuit current based on the capacity of the flexible direct system, after a fault occurs, the fault current is quickly increased and quickly reduced after reaching a peak value, and the lowest value is smaller than the steady-state short-circuit current. Due to the current characteristics, the relay protection sensitivity may not meet the operation requirement near the minimum value of the short-circuit current, and the relay protection sensitivity is difficult to improve by adjusting the protection setting value. However, for the fast main protection of the full-line fast motion, if the sensitivity of the relay protection is not satisfied with the requirement only from the lowest value of the short-circuit current, the fast motion performance of the protection cannot be considered sufficiently, the performance of the protection motion should be analyzed sufficiently from the time domain in combination with the protection motion time, the sensitivity of the relay protection is analyzed, and whether the sensitivity of the relay protection within the protection motion time satisfies the requirement of the delay of the protection motion is determined.
In an embodiment, whether the continuous time window meeting the protection sensitivity requirement meets the protection action delay requirement may be calculated by calculating, and the specific process may include:
determining a time point meeting the relay protection sensitivity requirement according to the relay protection sensitivity requirement;
searching a sensitivity maximum value point of a relay protection sensitivity matrix;
searching from the sensitivity maximum point to the fault starting time point, finishing searching to the last time point meeting the relay protection sensitivity requirement, and recording the time point as the first end point of the continuous time window meeting the relay protection sensitivity requirement;
searching from the sensitivity maximum point to the fault ending time point, ending after the last time point meeting the relay protection sensitivity requirement or exceeding the protection action time point is searched, and recording the point as a second endpoint of a continuous time window meeting the relay protection sensitivity requirement;
and determining the time difference between the first end point and the second end point as a continuous time window meeting the relay protection sensitivity requirement.
After determining the continuous time window meeting the relay protection sensitivity requirement, determining whether the relay protection sensitivity in the protection action time meets the protection action delay requirement or not according to the following mode:
comparing the duration of the continuous time window meeting the relay protection sensitivity requirement with the protection action delay of the relay protection device;
if the duration of the continuous time window meeting the relay protection sensitivity requirement is greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
if the duration of the continuous time window meeting the relay protection sensitivity requirement is not greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement;
and modifying the protection fixed value to recalculate the relay protection sensitivity within the protection action time until the relay protection sensitivity within the protection action time meets the protection action delay requirement.
The specific steps of calculating the continuous time window satisfying the protection sensitivity requirement and calculating whether it satisfies the protection action delay requirement will be described below with reference to the example of fig. 4, but the scope of the embodiments of the present invention is not limited to the example. As shown in fig. 4, calculating a continuous time window meeting the protection sensitivity requirement, and checking whether it meets the protection action delay requirement may specifically include:
402, performing fast Fourier decomposition processing on the short-circuit current matrix, and extracting a time-domain-based short-circuit current fundamental wave effective value;
404, acquiring a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix;
step 411, if the time length T1 of the continuous time window meeting the relay protection sensitivity requirement is greater than the protection action delay T2 of the relay protection device, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement, and ending the processing;
and 413, modifying the protection constant value, and returning to the step 403.
In an embodiment, the length of the time window may also be set according to the protection action delay, and the minimum value of the relay protection sensitivity in the time window near the short-circuit current peak after the occurrence of the fault is calculated, so as to check whether the relay protection sensitivity in the protection action time meets the protection action delay requirement, where the specific process may include:
setting a time window length corresponding to the protection action delay according to the protection action delay of the relay protection device;
comparing the relay protection sensitivity of the left end point and the right end point of a time window corresponding to the protection action delay from the fault starting time point;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is smaller than that of the right side, continuing to search downwards;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is not smaller than that of the right side, stopping searching, and recording the time of the left end point and the right end point of the time window corresponding to the protection action delay at the moment;
and calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at the moment.
After calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at this time, determining whether the relay protection sensitivity in the protection action time meets the protection action delay requirement or not according to the following mode:
comparing whether the minimum value of the relay protection sensitivity in a time window corresponding to the protection action delay is greater than the relay protection sensitivity meeting the relay protection sensitivity requirement;
if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is larger than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is not more than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
The following will describe, with reference to the example of fig. 5, a specific step of setting a time window length according to the protection action delay, and calculating a minimum value of the protection sensitivity in a time window near a short-circuit current peak after the occurrence of the fault, so as to check whether the relay protection sensitivity in the protection action time meets the protection action delay requirement. The scope of the embodiments of the present invention is not limited to the examples. As shown in fig. 5, the length of the time window is set according to the protection action delay, the minimum value of the protection sensitivity in the time window near the short-circuit current peak value after the fault occurs is calculated, and whether the minimum value meets the sensitivity requirement is checked, which may include:
502, performing fast Fourier decomposition processing on the short-circuit current matrix, and extracting a time-domain-based short-circuit current fundamental wave effective value;
504, acquiring a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix;
The embodiment of the invention also provides a device for determining the relay protection sensitivity of the AC power grid accessed by the flexible direct island, which is described in the following embodiment. Because the principle of solving the problems of the device is similar to the method for determining the relay protection sensitivity of the alternating current power grid accessed by the flexible direct island, the implementation of the device can refer to the implementation of the method for determining the relay protection sensitivity of the alternating current power grid accessed by the flexible direct island, and repeated parts are not repeated.
Fig. 6 is a schematic structural diagram of a device for determining relay protection sensitivity of an ac power grid accessed by a flexible direct island in an embodiment of the present invention. As shown in fig. 6, the apparatus for determining relay protection sensitivity of an ac power grid accessed by a flexible direct island in an embodiment of the present invention may include:
the short-circuit current matrix obtaining module 601 is configured to perform time domain simulation on an ac power grid fault accessed by a flexible-direct island to obtain a short-circuit current matrix;
the short-circuit current processing module 602 is configured to perform fast fourier decomposition processing on the short-circuit current matrix, and extract a time-domain-based short-circuit current fundamental effective value;
the relay protection action value calculation module 603 is configured to obtain a time-domain-based relay protection action value matrix according to the short-circuit current fundamental wave effective value and the protection fixed value;
a relay protection sensitivity matrix obtaining module 604, configured to obtain a time-domain-based relay protection sensitivity matrix according to the short-circuit current matrix and the relay protection action value matrix;
a relay protection sensitivity analysis module 605, configured to analyze, according to the relay protection sensitivity matrix, the relay protection sensitivity within the protection action time after the fault occurs;
and the protection setting value modifying module 606 is configured to modify the protection setting value and re-trigger the relay protection action value calculating module, the relay protection sensitivity matrix obtaining module and the relay protection sensitivity analyzing module to execute the modification when the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
Fig. 7 is a schematic structural diagram of a specific example of a device for determining relay protection sensitivity of an ac power grid accessed by a flexible direct island in an embodiment of the present invention. As shown in fig. 7, the apparatus for determining relay protection sensitivity of an ac power grid accessed by a flexible-direct island in an embodiment of the present invention further includes a first relay protection sensitivity determining module 701, configured to compare a duration of a continuous time window meeting a relay protection sensitivity requirement with a protection action delay of a relay protection apparatus, so as to determine whether the relay protection sensitivity within a protection action time meets the protection action delay requirement.
Fig. 8 is a schematic structural diagram of another specific example of the relay protection sensitivity determination device for the ac power grid connected to the flexible-direct island in the embodiment of the present invention. As shown in fig. 8, the apparatus for determining relay protection sensitivity of an ac power grid accessed by a flexible-direct island in an embodiment of the present invention further includes a second relay protection sensitivity determination module 801, configured to compare whether a minimum value of relay protection sensitivity in a time window corresponding to a protection action delay is greater than a relay protection sensitivity that meets a relay protection sensitivity requirement, so as to determine whether the relay protection sensitivity within the protection action time meets the protection action delay requirement.
In specific implementation, the short-circuit current matrix obtaining module 601 is specifically configured to:
and performing time domain simulation on the alternating current power grid fault accessed to the flexible and direct island by adopting electromagnetic transient simulation software to obtain a short-circuit current matrix.
In specific implementation, the relay protection sensitivity analysis module 605 is specifically configured to:
determining a time point meeting the relay protection sensitivity requirement according to the relay protection sensitivity requirement;
searching a sensitivity maximum value point of a relay protection sensitivity matrix;
searching from the sensitivity maximum point to the fault starting time point, finishing searching to the last time point meeting the relay protection sensitivity requirement, and recording the time point as the first end point of the continuous time window meeting the relay protection sensitivity requirement;
searching from the sensitivity maximum point to the fault ending time point, ending after the last time point meeting the relay protection sensitivity requirement or exceeding the protection action time point is searched, and recording the point as a second endpoint of a continuous time window meeting the relay protection sensitivity requirement;
and determining the time difference between the first end point and the second end point as a continuous time window meeting the relay protection sensitivity requirement.
In specific implementation, the first relay protection sensitivity determination module 701 is configured to:
comparing the duration of the continuous time window meeting the relay protection sensitivity requirement with the protection action delay of the relay protection device;
if the duration of the continuous time window meeting the relay protection sensitivity requirement is greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the duration of the continuous time window meeting the relay protection sensitivity requirement is not greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
In specific implementation, the relay protection sensitivity analysis module 605 is specifically configured to:
setting a time window length corresponding to the protection action delay according to the protection action delay of the relay protection device;
comparing the relay protection sensitivity of the left end point and the right end point of a time window corresponding to the protection action delay from the fault starting time point;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is smaller than that of the right side, continuing to search downwards;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is not smaller than that of the right side, stopping searching, and recording the time of the left end point and the right end point of the time window corresponding to the protection action delay at the moment;
and calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at the moment.
In specific implementation, the second relay protection sensitivity determination module 801 is configured to:
comparing whether the minimum value of the relay protection sensitivity in a time window corresponding to the protection action delay is greater than the relay protection sensitivity meeting the relay protection sensitivity requirement;
if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is larger than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is not more than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
Based on the aforementioned inventive concept, as shown in fig. 9, the present invention further provides a computer apparatus 900, which includes a memory 910, a processor 920 and a computer program 930 stored on the memory 910 and operable on the processor 920, wherein the processor 920 executes the computer program 930 to implement the aforementioned method for processing the account information of the robot automation process.
Based on the foregoing inventive concept, the present invention provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the method for determining relay protection sensitivity of an ac power grid accessed by a flexible direct island is implemented.
In summary, the method for determining the relay protection sensitivity of the ac power grid accessed to the flexible direct island in the embodiment of the present invention is different from the method for determining the relay protection sensitivity according to the steady-state short-circuit current and the protection fixed value in the prior art, and the embodiment of the present invention performs time-domain simulation on the ac power grid fault accessed to the flexible direct island, performs data processing on the short-circuit current obtained through simulation, performs relay protection sensitivity calculation in combination with the protection fixed value, and effectively evaluates the protection performance of the relay protection device, thereby improving the accuracy of the relay protection sensitivity of the ac power grid accessed to the flexible direct island.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (14)
1. A method for determining relay protection sensitivity of an alternating current power grid accessed by a flexible direct island is characterized by comprising the following steps:
performing time domain simulation on the alternating current power grid fault accessed to the flexible direct island to obtain a short-circuit current matrix;
performing fast Fourier decomposition processing on the short-circuit current matrix, and extracting a time-domain-based short-circuit current fundamental wave effective value;
and circularly executing the following steps until the relay protection sensitivity in the protection action time meets the protection action delay requirement:
according to the short-circuit current fundamental wave effective value and the protection constant value, a relay protection action value matrix based on a time domain is obtained;
obtaining a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix;
analyzing the relay protection sensitivity within the protection action time after the fault occurs according to the relay protection sensitivity matrix;
and if the relay protection sensitivity in the protection action time does not meet the protection action delay requirement, modifying the protection fixed value.
2. The method of claim 1, wherein performing time domain simulation on the ac grid fault of the flexible direct island access to obtain a short-circuit current matrix comprises:
and performing time domain simulation on the alternating current power grid fault accessed to the flexible and direct island by adopting electromagnetic transient simulation software to obtain a short-circuit current matrix.
3. The method of claim 1, wherein analyzing the relay protection sensitivity for the time of the protection action after the fault occurs based on the relay protection sensitivity matrix comprises:
determining a time point meeting the relay protection sensitivity requirement according to the relay protection sensitivity requirement;
searching a sensitivity maximum value point of a relay protection sensitivity matrix;
searching from the sensitivity maximum point to the fault starting time point, finishing searching to the last time point meeting the relay protection sensitivity requirement, and recording the time point as the first end point of the continuous time window meeting the relay protection sensitivity requirement;
searching from the sensitivity maximum point to the fault ending time point, ending after the last time point meeting the relay protection sensitivity requirement or exceeding the protection action time point is searched, and recording the point as a second endpoint of a continuous time window meeting the relay protection sensitivity requirement;
and determining the time difference between the first end point and the second end point as a continuous time window meeting the relay protection sensitivity requirement.
4. The method of claim 3, wherein after determining the continuous time window that meets the relay protection sensitivity requirement, further comprising determining whether the relay protection sensitivity within the protection action time meets the protection action delay requirement as follows:
comparing the duration of the continuous time window meeting the relay protection sensitivity requirement with the protection action delay of the relay protection device;
if the duration of the continuous time window meeting the relay protection sensitivity requirement is greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the duration of the continuous time window meeting the relay protection sensitivity requirement is not greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
5. The method of claim 1, wherein analyzing the relay protection sensitivity for the time of the protection action after the fault occurs based on the relay protection sensitivity matrix comprises:
setting a time window length corresponding to the protection action delay according to the protection action delay of the relay protection device;
comparing the relay protection sensitivity of the left end point and the right end point of a time window corresponding to the protection action delay from the fault starting time point;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is smaller than that of the right side, continuing to search downwards;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is not smaller than that of the right side, stopping searching, and recording the time of the left end point and the right end point of the time window corresponding to the protection action delay at the moment;
and calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at the moment.
6. The method of claim 5, wherein after calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at this time, determining whether the relay protection sensitivity in the protection action time meets the protection action delay requirement is further performed as follows:
comparing whether the minimum value of the relay protection sensitivity in a time window corresponding to the protection action delay is greater than the relay protection sensitivity meeting the relay protection sensitivity requirement;
if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is larger than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is not more than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
7. The utility model provides a gentle direct island AC electric network relay protection sensitivity of joining confirms device which characterized in that includes:
the short-circuit current matrix obtaining module is used for carrying out time domain simulation on the alternating current power grid fault accessed to the flexible direct island to obtain a short-circuit current matrix;
the short-circuit current processing module is used for performing fast Fourier decomposition processing on the short-circuit current matrix and extracting a time-domain-based short-circuit current fundamental wave effective value;
the relay protection action value calculation module is used for obtaining a relay protection action value matrix based on a time domain according to the short-circuit current fundamental wave effective value and the protection constant value;
the relay protection sensitivity matrix obtaining module is used for obtaining a relay protection sensitivity matrix based on a time domain according to the short-circuit current matrix and the relay protection action value matrix;
the relay protection sensitivity analysis module is used for analyzing the relay protection sensitivity in the protection action time after the fault occurs according to the relay protection sensitivity matrix;
and the protection constant value modification module is used for modifying the protection constant value when the relay protection sensitivity in the protection action time does not meet the protection action delay requirement, and re-triggering the relay protection action value calculation module, the relay protection sensitivity matrix acquisition module and the relay protection sensitivity analysis module to execute.
8. The apparatus of claim 7, wherein the short circuit current matrix obtaining module is specifically configured to:
and performing time domain simulation on the alternating current power grid fault accessed to the flexible and direct island by adopting electromagnetic transient simulation software to obtain a short-circuit current matrix.
9. The apparatus of claim 7, wherein the relay protection sensitivity analysis module is specifically configured to:
determining a time point meeting the relay protection sensitivity requirement according to the relay protection sensitivity requirement;
searching a sensitivity maximum value point of a relay protection sensitivity matrix;
searching from the sensitivity maximum point to the fault starting time point, finishing searching to the last time point meeting the relay protection sensitivity requirement, and recording the time point as the first end point of the continuous time window meeting the relay protection sensitivity requirement;
searching from the sensitivity maximum point to the fault ending time point, ending after the last time point meeting the relay protection sensitivity requirement or exceeding the protection action time point is searched, and recording the point as a second endpoint of a continuous time window meeting the relay protection sensitivity requirement;
and determining the time difference between the first end point and the second end point as a continuous time window meeting the relay protection sensitivity requirement.
10. The apparatus of claim 9, further comprising a first relay protection sensitivity determination module configured to:
comparing the duration of the continuous time window meeting the relay protection sensitivity requirement with the protection action delay of the relay protection device;
if the duration of the continuous time window meeting the relay protection sensitivity requirement is greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the duration of the continuous time window meeting the relay protection sensitivity requirement is not greater than the protection action delay of the relay protection device, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
11. The apparatus of claim 7, wherein the relay protection sensitivity analysis module is specifically configured to:
setting a time window length corresponding to the protection action delay according to the protection action delay of the relay protection device;
comparing the relay protection sensitivity of the left end point and the right end point of a time window corresponding to the protection action delay from the fault starting time point;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is smaller than that of the right side, continuing to search downwards;
if the relay protection sensitivity of the left end point of the time window corresponding to the protection action delay is not smaller than that of the right side, stopping searching, and recording the time of the left end point and the right end point of the time window corresponding to the protection action delay at the moment;
and calculating the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay at the moment.
12. The apparatus of claim 11, further comprising a second relay protection sensitivity determination module configured to:
comparing whether the minimum value of the relay protection sensitivity in a time window corresponding to the protection action delay is greater than the relay protection sensitivity meeting the relay protection sensitivity requirement;
if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is larger than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time meets the protection action delay requirement;
and if the minimum value of the relay protection sensitivity in the time window corresponding to the protection action delay is not more than the relay protection sensitivity meeting the relay protection sensitivity requirement, determining that the relay protection sensitivity in the protection action time does not meet the protection action delay requirement.
13. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the method of any one of claims 1 to 6 when executing the computer program.
14. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for executing the method of any one of claims 1 to 6.
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