CN110011300B - Locking fault receiving end auxiliary decision-making method and device for direct-current transmission system - Google Patents
Locking fault receiving end auxiliary decision-making method and device for direct-current transmission system Download PDFInfo
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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
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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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
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Abstract
The application relates to a locking fault receiving end auxiliary decision-making method and device for a direct current transmission system, wherein the method comprises the following steps: when a blocking fault occurs in the direct-current transmission system, for a receiving end power grid with cross section power out-of-limit and/or frequency out-of-limit, determining a fault unit in the receiving end power grid by adopting a k-means algorithm according to active and reactive power variation of units in the receiving end power grid before and after the blocking fault occurs in the direct-current transmission system; and adjusting the power of the fault unit in the receiving end power grid. According to the technical scheme provided by the application, the direct current transmission system with the blocking fault is assisted by adjusting the fault unit in the receiving end power grid based on the K-means clustering algorithm, so that the change condition of the receiving end power grid unit before and after the blocking fault of the direct current transmission system can be intuitively obtained, and the blocking fault of the direct current transmission system is assisted in a targeted manner.
Description
Technical Field
The application relates to the field of power system automation, in particular to a method and a device for auxiliary decision making of a blocking fault receiving end of a direct current transmission system.
Background
The extra-high voltage direct current transmission has the advantages of large transmission capacity, long transmission distance, small network loss, line corridor saving, good economical efficiency and the like, so that the extra-high voltage direct current transmission has long-term development. Along with the construction of the domestic extra-high voltage direct current transmission engineering, the remote trans-regional trans-provincial power transmission capacity is obviously increased, the power grid pattern is greatly changed, the possibility of blocking faults of an extra-high voltage direct current system is gradually increased due to the influence of factors such as natural geological disasters along the line and the reliability of transmission equipment. Once the extra-high voltage direct current transmission system has a blocking fault, the instantaneous deficiency of the power supply source of the power grid of the receiving end is caused, the power balance and normal power supply of the receiving end system are greatly influenced, the active and reactive balance and the stability of frequency and voltage of the receiving end system are influenced, and even a large-scale power failure accident occurs, so that the flow analysis of the receiving end unit and load after the blocking fault of the extra-high voltage direct current transmission system is necessary, the reasonable regulation and control of the receiving end unit and load after the blocking fault is determined, and an auxiliary decision method is provided for the blocking fault treatment.
The current regulation strategy of the receiving end after the locking fault comprises the steps of researching the frequency response of the receiving end after the fault from the aspect of load, researching the optimal scheduling strategy of the receiving end after the fault from the aspect of power support and the like. However, the analysis method based on the physical model construction does not mine the relation between fault characteristics from the data angle, so that great waste is caused to data resources, the pace of power grid construction is continuously accelerated, the internal interaction influence is more complex, and the inadaptability of the traditional method is more obvious. With the advent of the digital age, big data technology has been applied to many fields of electric power systems, but application in the field of extra-high voltage direct current fault is less, and trend analysis after the extra-high voltage direct current fault is mostly based on traditional mechanism analysis, model construction and experimental simulation, and the inherent relation of data itself is ignored.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide a locking fault receiving end auxiliary decision method and device for a direct current transmission system, which are used for adjusting a fault unit in a receiving end power grid based on a K-means clustering algorithm to assist the direct current transmission system with locking faults, so that the change condition of the receiving end power grid unit before and after the locking faults of the direct current transmission system can be intuitively obtained, and the locking faults of the direct current transmission system can be processed in an auxiliary way.
The application aims at adopting the following technical scheme:
in a method for locking out a fault receiver-aid decision making in a dc power transmission system, the improvement comprising:
when a blocking failure occurs in the direct current transmission system,
for the receiving end power network with section power out-of-limit and/or frequency out-of-limit, determining a fault unit in the receiving end power network by adopting a k-means algorithm according to the active and reactive power variation of units in the receiving end power network before and after a blocking fault occurs in the direct current power transmission system;
and adjusting the power of the fault unit in the receiving end power grid.
Preferably, the determining, by using a k-means algorithm, the faulty unit in the receiving end power grid according to the active power variation and the reactive power variation of the unit in the receiving end power grid before and after the blocking fault of the direct current power transmission system includes:
s1, determining a unit to be clustered in a receiving end power grid according to active and reactive power variation of the unit in the receiving end power grid before and after a blocking fault occurs in a direct current power transmission system;
s2, randomly selecting k units to be clustered from the units to be clustered to serve as clustering centers;
s3, clustering the units to be clustered according to the distance between the coordinates of the units to be clustered and the coordinates of the clustering center, wherein the j-th unit to be clustered has the coordinates ofN is the total number of units to be clustered, +.>For the active power variation average value of the j-th group to be clustered, < >>The average value of the reactive power variation of the j-th unit to be clustered is the average value of the reactive power variation of the j-th unit to be clustered;
s4, updating coordinates of the clustering center;
s5, judging whether the criterion function is equal to zero, if so, executing the step S6, and if not, returning to the step S3;
s6, selecting a cluster corresponding to the cluster center with the largest coordinate value, and taking a corresponding unit in the cluster as a fault unit.
Further, the step S1 includes:
and if the active power variation of the unit in the receiving end power grid before and after the blocking failure of the direct current transmission system is larger than the active power variation threshold value and the reactive power variation of the unit in the receiving end power grid before and after the blocking failure of the direct current transmission system is larger than the reactive power variation threshold value, the unit is the unit to be clustered.
Specifically, the active power variation delta P of the ith unit in the receiving end power grid before and after the blocking fault of the direct current transmission system is determined according to the following formula i ：
ΔP i ＝P i fault -P i before
In the above formula, i is [1, L ]]L is the total number of units in the receiving-end power grid; p (P) i before Active power of ith unit in receiving end power grid before blocking fault of direct current power transmission system, P i fault The active power of the ith unit in the receiving end power grid after the blocking fault of the direct current power transmission system occurs;
determining reactive power variation delta Q of ith unit in receiving end power grid before and after blocking fault of direct current transmission system according to the following method i ：
In the above-mentioned method, the step of,active power of the ith unit in the receiving end power grid before blocking failure occurs for direct current transmission system, +.>And the reactive power of the ith unit in the receiving end power grid after the blocking fault of the direct current power transmission system occurs.
Further, the step S3 includes:
determining the distance d between the coordinates of the jth group to be clustered and the coordinates of the kth clustering center according to the following method j ：
In the above, k is [1, K ]]K is the total number of cluster centers;the average value of the active power variation quantity average value of the set coordinates in the kth cluster is +.>The average value of reactive power variation in the coordinates of the kth cluster center is +.>
The average value of the active power variation in the coordinates of the jth unit to be clustered is determined according to the following formula
Determining the average value of reactive power variation in the coordinates of the jth unit to be clustered according to the following method
In the above, j is E [1, N]N is the total number of units to be clustered; ΔP j,m The active power variable quantity delta Q of the jth unit to be clustered when the direct current transmission system fails at the moment m j,m The reactive power variable quantity of the jth group to be clustered when the direct current transmission system fails at the moment m is m epsilon [1, M]M is the total number of fault moments of the direct current transmission system.
Further, the step S4 includes:
updating the coordinates of the kth cluster center as follows:
in the above, k is [1, K ]]K is the total number of cluster centers; b E [1, B]B is the total number of units in the kth cluster; mu (mu) k A is the coordinates of the k cluster center after updating b,k The coordinates of the b-th unit in the kth cluster.
Further, the step S5 includes:
the criterion function E is determined as follows:
further, the step S6 includes:
the coordinate value W of the kth cluster center is determined according to the following mode k ：
In the above, k is [1, K ]]K is the total number of cluster centers;the average value of the active power variation quantity average value of the set coordinates in the kth cluster,,, is the average value of the active power variation quantity average value of the set coordinates in the kth cluster>The average value of reactive power variation in the coordinates of the kth cluster center is +.>
Preferably, the adjusting the power of the fault unit in the receiving-end power grid includes:
if the type of the fault unit in the receiving end power grid is a pumping and accumulating unit, the fault unit is shut down, and when the locking fault of the direct current transmission system is eliminated, the active power and the reactive power of the fault unit are respectively regulated to rated values;
if the type of the fault unit in the receiving end power grid is a non-pumping storage unit, reducing 5% of rated power of the fault unit every turn until frequency out-of-limit and/or section power out-of-limit of the receiving end power grid are eliminated, and when a locking fault of the direct current transmission system is eliminated, respectively adjusting active power and reactive power of the fault unit to rated values of the fault unit.
In a dc power transmission system lockout fault receiver side decision-making apparatus, the improvement comprising:
a determining unit for determining, when a blocking failure occurs in the DC transmission system,
for the receiving end power network with section power out-of-limit and/or frequency out-of-limit, determining a fault unit in the receiving end power network by adopting a k-means algorithm according to the active and reactive power variation of units in the receiving end power network before and after a blocking fault occurs in the direct current power transmission system;
and the adjusting unit is used for adjusting the power of the fault unit in the receiving end power grid.
Compared with the closest prior art, the application has the following beneficial effects:
according to the technical scheme provided by the application, when the direct-current power transmission system has a blocking fault, the power of the fault unit in the receiving end power grid is regulated by adopting a k-means algorithm according to the active and reactive power variation of the unit in the receiving end power grid before and after the blocking fault of the direct-current power transmission system, and the variation condition of the receiving end power grid unit before and after the blocking fault of the direct-current power transmission system is more intuitively obtained, so that the blocking fault of the direct-current power transmission system is assisted in a targeted manner, the efficiency and reliability of the auxiliary treatment are improved, and the application range is wide.
Drawings
Fig. 1 is a schematic flow chart of a method for assisting decision-making of a blocking fault receiver of a dc power transmission system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a device for assisting decision-making of a blocking failure receiver of a dc power transmission system according to an embodiment of the present application.
Detailed Description
The following describes the embodiments of the present application in further detail with reference to the drawings.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
When a blocking fault occurs in the direct current transmission system, judging whether the receiving end power grid has cross section power out-of-limit and/or frequency out-of-limit according to the cross section power subjected to primary frequency modulation of the receiving end power grid and the dynamic primary frequency modulation frequency of the receiving end power grid, if so, processing the blocking fault receiving end auxiliary decision method of the direct current transmission system, and if not, ending the operation.
The method for judging whether the section power of the receiving end power grid is out of limit and/or the frequency is out of limit according to the section power of the receiving end power grid after primary frequency modulation and the dynamic primary frequency modulation frequency of the receiving end power grid comprises the following steps:
if the section power of the receiving-end power grid after primary frequency modulation is larger than the section power limit, the section power of the receiving-end power grid is out of limit;
and if the dynamic primary frequency modulation frequency of the receiving end power grid is larger than the frequency limit, the receiving end power grid has frequency out-of-limit.
A method for locking fault receiving end auxiliary decision making of a direct current transmission system, as shown in fig. 1, the method comprises the following steps:
101. when a blocking failure occurs in the direct current transmission system,
for the receiving end power network with section power out-of-limit and/or frequency out-of-limit, determining a fault unit in the receiving end power network by adopting a k-means algorithm according to the active and reactive power variation of units in the receiving end power network before and after a blocking fault occurs in the direct current power transmission system;
102. and adjusting the power of the fault unit in the receiving end power grid.
Further, the step 101 includes:
s1, determining a unit to be clustered in a receiving end power grid according to active and reactive power variation of the unit in the receiving end power grid before and after a blocking fault occurs in a direct current power transmission system;
s2, randomly selecting k units to be clustered from the units to be clustered to serve as clustering centers;
s3, clustering the units to be clustered according to the distance between the coordinates of the units to be clustered and the coordinates of the clustering center, wherein the j-th unit to be clustered has the coordinates ofN is the total number of units to be clustered, +.>For the active power variation average value of the j-th group to be clustered, < >>The average value of the reactive power variation of the j-th unit to be clustered is the average value of the reactive power variation of the j-th unit to be clustered;
s4, updating coordinates of the clustering center;
s5, judging whether the criterion function is equal to zero, if so, executing the step S6, and if not, returning to the step S3;
s6, selecting a cluster corresponding to the cluster center with the largest coordinate value, and taking a corresponding unit in the cluster as a fault unit.
Specifically, the step S1 includes:
and if the active power variation of the unit in the receiving end power grid before and after the blocking failure of the direct current transmission system is larger than the active power variation threshold value and the reactive power variation of the unit in the receiving end power grid before and after the blocking failure of the direct current transmission system is larger than the reactive power variation threshold value, the unit is the unit to be clustered.
The active power variation delta P of the ith unit in the receiving end power grid before and after the blocking fault of the direct current transmission system is determined according to the following formula i ：
ΔP i ＝P i fault -P i before
In the above formula, i is [1, L ]]L is the total number of units in the receiving-end power grid; p (P) i before Active power of ith unit in receiving end power grid before blocking fault of direct current power transmission system, P i fault The active power of the ith unit in the receiving end power grid after the blocking fault of the direct current power transmission system occurs;
determining reactive power variation delta Q of ith unit in receiving end power grid before and after blocking fault of direct current transmission system according to the following method i ：
In the above-mentioned method, the step of,active power of the ith unit in the receiving end power grid before blocking failure occurs for direct current transmission system, +.>And the reactive power of the ith unit in the receiving end power grid after the blocking fault of the direct current power transmission system occurs.
Specifically, the step S3 includes:
determining the distance d between the coordinates of the jth group to be clustered and the coordinates of the kth clustering center according to the following method j ：
In the above, k is [1, K ]]K is the total number of cluster centers;the average value of the active power variation quantity average value of the set coordinates in the kth cluster is +.>The average value of reactive power variation in the coordinates of the kth cluster center is +.>
Determining the average value of active power variation in the coordinates of the jth unit to be clustered according to the following method
Determining the average value of reactive power variation in the coordinates of the jth unit to be clustered according to the following method
In the above, j is E [1, N]N is the total number of units to be clustered; ΔP j,m The active power variable quantity delta Q of the jth unit to be clustered when the direct current transmission system fails at the moment m j,m The reactive power variable quantity of the jth group to be clustered when the direct current transmission system fails at the moment m is m epsilon [1, M]M is the total number of fault moments of the direct current transmission system.
Specifically, the step S4 includes:
updating the coordinates of the kth cluster center as follows:
in the above, k is [1, K ]]K is the total number of cluster centers; b E [1, B]B is the total number of units in the kth cluster; mu (mu) k A is the coordinates of the k cluster center after updating b,k The coordinates of the b-th unit in the kth cluster.
Specifically, the step S5 includes:
the criterion function E is determined as follows:
specifically, the step S6 includes:
the coordinate value W of the kth cluster center is determined according to the following mode k ：
In the above, k is [1, K ]]K is the total number of cluster centers;the average value of the active power variation quantity average value of the set coordinates in the kth cluster,,, is the average value of the active power variation quantity average value of the set coordinates in the kth cluster>The average value of reactive power variation in the coordinates of the kth cluster center is +.>
Further, the step 102 includes:
if the type of the fault unit in the receiving end power grid is a pumping and accumulating unit, the fault unit is shut down, and when the locking fault of the direct current transmission system is eliminated, the active power and the reactive power of the fault unit are respectively regulated to rated values;
if the type of the fault unit in the receiving end power grid is a non-pumping storage unit, reducing 5% of rated power of the fault unit every turn until frequency out-of-limit and/or section power out-of-limit of the receiving end power grid are eliminated, and when a locking fault of the direct current transmission system is eliminated, respectively adjusting active power and reactive power of the fault unit to rated values of the fault unit.
The application also provides a device for auxiliary decision making of the blocking fault receiving end of the direct current transmission system, as shown in fig. 2, the device comprises:
a determining unit for determining, when a blocking failure occurs in the DC transmission system,
for the receiving end power network with section power out-of-limit and/or frequency out-of-limit, determining a fault unit in the receiving end power network by adopting a k-means algorithm according to the active and reactive power variation of units in the receiving end power network before and after a blocking fault occurs in the direct current power transmission system;
and the adjusting unit is used for adjusting the power of the fault unit in the receiving end power grid.
Further, the determining unit includes:
the determining module is used for determining the units to be clustered in the receiving-end power grid according to the active power variation and the reactive power variation of the units in the receiving-end power grid before and after the blocking fault of the direct-current power transmission system;
the first selection module is used for randomly selecting k units to be clustered from the units to be clustered to be a clustering center;
the clustering module is used for clustering the units to be clustered according to the distance between the coordinates of the units to be clustered and the coordinates of the clustering center, wherein the j-th unit to be clustered has the coordinates ofN is the total number of units to be clustered, +.>For the active power variation average value of the j-th group to be clustered, < >>The average value of the reactive power variation of the j-th unit to be clustered is the average value of the reactive power variation of the j-th unit to be clustered;
the updating module is used for updating the coordinates of the clustering center;
the first judging module is used for judging whether the criterion function is equal to zero, if so, executing the step S6, and if not, returning to the step S3;
the second selection module is used for selecting a cluster corresponding to the cluster center with the largest coordinate value, and taking a corresponding unit in the cluster as a fault unit.
Specifically, the determining module includes:
the judging sub-module is used for judging whether the unit is a unit to be clustered or not if the active power variation of the unit in the receiving end power grid before and after the blocking failure of the direct current transmission system is larger than the active power variation threshold value and the reactive power variation of the unit in the receiving end power grid before and after the blocking failure of the direct current transmission system is larger than the reactive power variation threshold value;
first acknowledgementThe stator module is used for determining the active power variation delta P of the ith unit in the receiving end power grid before and after the blocking fault of the direct current transmission system according to the following mode i ：
ΔP i ＝P i fault -P i before
In the above formula, i is [1, L ]]L is the total number of units in the receiving-end power grid; p (P) i before Active power of ith unit in receiving end power grid before blocking fault of direct current power transmission system, P i fault The active power of the ith unit in the receiving end power grid after the blocking fault of the direct current power transmission system occurs;
the second determining submodule is used for determining reactive power variation delta Q of an ith unit in the receiving-end power grid before and after the blocking fault of the direct-current power transmission system according to the following formula i ：
In the above-mentioned method, the step of,active power of the ith unit in the receiving end power grid before blocking failure occurs for direct current transmission system, +.>And the reactive power of the ith unit in the receiving end power grid after the blocking fault of the direct current power transmission system occurs.
Specifically, the clustering module includes:
a third determining submodule for determining the distance d between the coordinate of the jth group to be clustered and the coordinate of the kth clustering center according to the following formula j ：
In the above, k is [1, K ]]K is the total number of cluster centers;the average value of the active power variation quantity average value of the set coordinates in the kth cluster is +.>The average value of reactive power variation in the coordinates of the kth cluster center is +.>
A fourth determination submodule for determining an average value of active power variation in coordinates of the jth unit to be clustered according to the following formula
A fifth determination submodule for determining the average value of the reactive power variation in the coordinates of the jth group to be clustered according to the following method
In the above, j is E [1, N]N is the total number of units to be clustered; ΔP j,m The active power variable quantity delta Q of the jth unit to be clustered when the direct current transmission system fails at the moment m j,m The reactive power variable quantity of the jth group to be clustered when the direct current transmission system fails at the moment m is m epsilon [1, M]M is the total number of fault moments of the direct current transmission system.
Specifically, the updating module is specifically configured to:
updating the coordinates of the kth cluster center as follows:
in the above, k is [1, K ]]K is the total number of cluster centers; b E [1, B]B is the total number of units in the kth cluster; mu (mu) k A is the coordinates of the k cluster center after updating b,k The coordinates of the b-th unit in the kth cluster.
Specifically, the judging module is specifically configured to:
the criterion function E is determined as follows:
specifically, the second selecting module is specifically configured to:
the coordinate value W of the kth cluster center is determined according to the following mode k ：
In the above, k is [1, K ]]K is the total number of cluster centers;the average value of the active power variation quantity average value of the set coordinates in the kth cluster,,, is the average value of the active power variation quantity average value of the set coordinates in the kth cluster>The average value of reactive power variation in the coordinates of the kth cluster center is +.>
Further, the adjusting unit includes:
the second judging module is used for shutting down the fault unit if the type of the fault unit in the receiving end power grid is a pumping and accumulating unit, and respectively adjusting the active power and the reactive power of the fault unit to rated values of the fault unit when the locking fault of the direct current transmission system is eliminated;
and the third judging module is used for reducing 5% of rated power of the fault unit in each turn until frequency out-of-limit and/or section power out-of-limit of the receiving end power grid are eliminated if the type of the fault unit in the receiving end power grid is a non-pumping unit, and respectively regulating active power and reactive power of the fault unit to rated values when locking faults of the direct current transmission system are eliminated.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application 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 application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the claims.
Claims (9)
1. The locking fault receiving end auxiliary decision-making method for the direct current transmission system is characterized by comprising the following steps of:
when a blocking failure occurs in the direct current transmission system,
for the receiving end power network with section power out-of-limit and/or frequency out-of-limit, determining a fault unit in the receiving end power network by adopting a k-means algorithm according to the active and reactive power variation of units in the receiving end power network before and after a blocking fault occurs in the direct current power transmission system;
adjusting the power of a fault unit in a receiving end power grid;
the method for determining the fault unit in the receiving end power grid by adopting the k-means algorithm according to the active and reactive power variation of the unit in the receiving end power grid before and after the blocking fault of the direct current power transmission system comprises the following steps:
s1, determining a unit to be clustered in a receiving end power grid according to active and reactive power variation of the unit in the receiving end power grid before and after a blocking fault occurs in a direct current power transmission system;
s2, randomly selecting k units to be clustered from the units to be clustered to serve as clustering centers;
s3, clustering the units to be clustered according to the distance between the coordinates of the units to be clustered and the coordinates of the clustering center, wherein the j-th unit to be clustered has the coordinates ofN is the total number of units to be clustered, +.>For the active power variation average value of the j-th group to be clustered, < >>The average value of the reactive power variation of the j-th unit to be clustered is the average value of the reactive power variation of the j-th unit to be clustered;
s4, updating coordinates of the clustering center;
s5, judging whether the criterion function is equal to zero, if so, executing the step S6, and if not, returning to the step S3;
s6, selecting a cluster corresponding to the cluster center with the largest coordinate value, and taking a corresponding unit in the cluster as a fault unit.
2. The method according to claim 1, wherein the step S1 includes:
and if the active power variation of the unit in the receiving end power grid before and after the blocking failure of the direct current transmission system is larger than the active power variation threshold value and the reactive power variation of the unit in the receiving end power grid before and after the blocking failure of the direct current transmission system is larger than the reactive power variation threshold value, the unit is the unit to be clustered.
3. The method of claim 2, wherein the active power change Δp of the ith unit in the receiving grid before and after the blocking failure of the dc transmission system is determined as follows i ：
ΔP i ＝P i fault -P i before
In the above formula, i is [1, L ]]L is the receiving end power grid central machineTotal number of groups; p (P) i before Active power of ith unit in receiving end power grid before blocking fault of direct current power transmission system, P i fault The active power of the ith unit in the receiving end power grid after the blocking fault of the direct current power transmission system occurs;
determining reactive power variation delta Q of ith unit in receiving end power grid before and after blocking fault of direct current transmission system according to the following method i ：
In the above-mentioned method, the step of,the active power of the ith unit in the receiving end power grid before the blocking fault of the direct current power transmission system,and the reactive power of the ith unit in the receiving end power grid after the blocking fault of the direct current power transmission system occurs.
4. The method according to claim 1, wherein the step S3 includes:
determining the distance d between the coordinates of the jth group to be clustered and the coordinates of the kth clustering center according to the following method j ：
In the above, k is [1, K ]]K is the total number of cluster centers;the average value of the active power variation quantity average value of the set coordinates in the kth cluster is +.>In the coordinates of the kth cluster centerReactive power variation average value, the coordinates of the kth cluster center are +.>
The average value of the active power variation in the coordinates of the jth unit to be clustered is determined according to the following formula
Determining the average value of reactive power variation in the coordinates of the jth unit to be clustered according to the following method
In the above, j is E [1, N]N is the total number of units to be clustered; ΔP j,m The active power variable quantity delta Q of the jth unit to be clustered when the direct current transmission system fails at the moment m j,m The reactive power variable quantity of the jth group to be clustered when the direct current transmission system fails at the moment m is m epsilon [1, M]M is the total number of fault moments of the direct current transmission system.
5. The method according to claim 1, wherein the step S4 includes:
updating the coordinates of the kth cluster center as follows:
in the above, k is [1, K ]]K is the total number of cluster centers; b E [1, B]B is the total number of units in the kth cluster; mu (mu) k A is the coordinates of the k cluster center after updating b,k The coordinates of the b-th unit in the kth cluster.
6. The method according to claim 5, wherein the step S5 includes:
the criterion function E is determined as follows:
。
7. the method according to claim 1, wherein the step S6 includes:
the coordinate value W of the kth cluster center is determined according to the following mode k ：
In the above, k is [1, K ]]K is the total number of cluster centers;the average value of the active power variation quantity average value of the set coordinates in the kth cluster is +.>The average value of reactive power variation in the coordinates of the kth cluster center is +.>
8. The method of claim 1, wherein said adjusting power of a faulty unit in the receiving grid comprises:
if the type of the fault unit in the receiving end power grid is a pumping and accumulating unit, the fault unit is shut down, and when the locking fault of the direct current transmission system is eliminated, the active power and the reactive power of the fault unit are respectively regulated to rated values;
if the type of the fault unit in the receiving end power grid is a non-pumping storage unit, reducing 5% of rated power of the fault unit every turn until frequency out-of-limit and/or section power out-of-limit of the receiving end power grid are eliminated, and when a locking fault of the direct current transmission system is eliminated, respectively adjusting active power and reactive power of the fault unit to rated values of the fault unit.
9. A latching fault receiver-side decision-making device for a direct current transmission system, the device comprising:
a determining unit for determining, when a blocking failure occurs in the DC transmission system,
for the receiving end power network with section power out-of-limit and/or frequency out-of-limit, determining a fault unit in the receiving end power network by adopting a k-means algorithm according to the active and reactive power variation of units in the receiving end power network before and after a blocking fault occurs in the direct current power transmission system;
the adjusting unit is used for adjusting the power of the fault unit in the receiving end power grid;
the determination unit includes:
the determining module is used for determining the units to be clustered in the receiving-end power grid according to the active power variation and the reactive power variation of the units in the receiving-end power grid before and after the blocking fault of the direct-current power transmission system;
the first selection module is used for randomly selecting k units to be clustered from the units to be clustered to be a clustering center;
the clustering module is used for clustering the units to be clustered according to the distance between the coordinates of the units to be clustered and the coordinates of the clustering center, wherein the j-th unit to be clustered has the coordinates ofN is the total number of units to be clustered,for the active power variation average value of the j-th group to be clustered, < >>The average value of the reactive power variation of the j-th unit to be clustered is the average value of the reactive power variation of the j-th unit to be clustered;
the updating module is used for updating the coordinates of the clustering center;
the first judging module is used for judging whether the criterion function is equal to zero, if so, executing the step S6, and if not, returning to the step S3;
the second selection module is used for selecting a cluster corresponding to the cluster center with the largest coordinate value, and taking a corresponding unit in the cluster as a fault unit.
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