CN113361856B - Method and device for evaluating running risk of direct-current transmission system - Google Patents
Method and device for evaluating running risk of direct-current transmission system Download PDFInfo
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Abstract
The invention provides a method and a device for evaluating running risk of a direct current transmission system, wherein the method comprises the following steps: calculating an action risk coefficient of each protection and a power loss amount of an action outlet of each protection; determining an operation risk value of the direct-current transmission system according to the action risk coefficient of each protection and the power loss amount of the action outlet of each protection; the action risk coefficient of one protection and the power loss of the action outlet are calculated and obtained in the following mode: collecting criterion quantity for protection calculation in a direct current control protection system in real time; calculating an action risk coefficient according to the criterion quantity and a preset threshold value corresponding to the criterion quantity; and calculating the power loss of the protected action outlet according to the direct current operation mode and the power level information which are acquired in real time and the characteristics of the protected action outlet. According to the method and the device, the direct current protection action risk state is monitored in real time, and the weak point of the direct current operation risk is given, so that the direct current operation risk is evaluated in real time, and the coping capability can be greatly improved.
Description
Technical Field
The invention relates to the technical field of operation risk assessment of a direct-current power transmission system, in particular to a method and a device for assessing operation risk of the direct-current power transmission system.
Background
With the construction of large-capacity and long-distance direct-current transmission projects in China, the power grid in China forms a large-scale alternating-current and direct-current hybrid connection pattern, and the running state of direct-current transmission has a great influence on the safety and stability of large complex alternating-current and direct-current power grids. How to ensure the safe and reliable operation of various direct current transmission systems such as (special) high voltage direct current and flexible direct current has important significance.
The method has the advantages that the real-time monitoring of the direct current running state is enhanced, the direct current running risk real-time assessment system is established, the extra-high voltage direct current running state and the main risk are known, the risk sensing and pre-controlling capacity of the regulation and control operators on the high-voltage direct current system with long-distance and large-capacity power transmission can be effectively improved, and the safe and reliable running level of direct current is improved. For the direct current running risk, a risk assessment method capable of definite quantification and real-time monitoring is still lacking at present.
The existing method is based on the evaluation of the power grid risk and the equipment reliability, the power grid risk is difficult to be pre-judged in advance from the perspective of the influence on the power grid, the equipment reliability mainly considers the influence of the weather environment, the equipment reliability is not considered from the running state of direct current, and the method has great limitation.
Disclosure of Invention
The invention aims to provide a method and a device for evaluating running risks of a direct-current transmission system, which are used for monitoring a direct-current running state in real time and providing a direct-current running risk weak point, so that the direct-current running risk is evaluated in real time, and the response capability is improved.
In order to solve the above technical problem, in a first aspect, an embodiment of the present invention provides a method for evaluating an operation risk of a dc power transmission system, including:
calculating an action risk coefficient of each protection and a power loss amount of an action outlet of each protection;
determining an operation risk value of the direct current transmission system according to the action risk coefficient of each protection and the power loss of the action outlet of each protection;
wherein, the action risk coefficient and the power loss of the action exit of a protection are calculated by the following method:
collecting criterion quantity for protection calculation in a direct current control protection system in real time;
calculating an action risk coefficient according to the criterion quantity and a preset threshold corresponding to the criterion quantity;
and calculating the power loss of the protected action outlet according to the direct current operation mode and the power level information which are acquired in real time and the characteristics of the protected action outlet.
Further, the action risk coefficient of each protection is calculated according to the following formula:
wherein X ij N, n is the number of protection in the direct current control protection system, k is the total number of action conditions required to be met by the ith protection, and R is i Action risk factor for the ith protection, X thij Is a reaction with X ij A corresponding set threshold.
Further, the determining an operation risk value of the dc power transmission system according to the action risk coefficient of each protection and the power loss amount of the action outlet of each protection specifically includes:
judging whether at least one protected action risk coefficient is in a first preset range, and if so, determining the operation risk value of the direct current power transmission system as follows: p loss ＝Max{P lossi }; wherein, P loss For the operational risk value of the DC transmission system, { P lossi The action risk coefficient belongs to a set of power loss quantities of protected action outlets in a first preset range, and i is less than or equal to n;
if not, judging whether at least one protected action risk coefficient is in a second preset range; if yes, determining the operation risk value of the direct current transmission system as follows: p loss ＝Max{P lossi }; wherein, { P lossi For the amount of power loss at the motion exit of the protection whose motion risk coefficient falls within a second predetermined rangeSet, i is less than or equal to n; if not, determining the operation risk value of the direct current transmission system as 0; wherein the second preset range is (x 1, x 2)]The first preset range is (x 2, 1), x1<x2<1。
Further, the method for assessing the running risk of the direct current transmission system further includes:
and displaying the operation risk value of the direct current transmission system and the action risk coefficient corresponding to the operation risk value of the direct current transmission system in real time.
Further, the method for assessing the running risk of the direct current transmission system further includes:
grading the protection action risk according to the protection action risk coefficient to obtain the protection action risk grade;
and displaying the protection action risk state in real time according to the protection action risk level.
Further, the method for assessing the running risk of the direct current transmission system further includes:
and for the protection related to the stress index of the electrical equipment, prompt information is given to the corresponding equipment running state according to the action risk coefficient.
Further, the ranking the protection action risk according to the protection action risk coefficient specifically includes:
if the protected action risk coefficient is within the first preset range, the protected action risk belongs to a serious alarm category;
if the protected action risk coefficient is within the second preset range, the protected action risk belongs to a slight alarm level;
and if the protected action risk coefficient is not in the first preset range or the second preset range, the protected action risk belongs to the safety level.
Further, the first preset range is (0.9,0.98), and the first preset range is (0.98,1).
An embodiment of the present invention further provides a device for evaluating an operation risk of a dc power transmission system, including:
the calculation module is used for calculating the action risk coefficient of each protection and the power loss amount of the action outlet of each protection;
the operation risk value determining module is used for determining the operation risk value of the direct current transmission system according to the action risk coefficient of each protection and the power loss amount of the action outlet of each protection;
wherein, the action risk coefficient and the power loss of the action exit of a protection are calculated by the following method:
collecting criterion quantity for protection calculation in a direct current control protection system in real time;
calculating an action risk coefficient according to the criterion quantity and a preset threshold corresponding to the criterion quantity;
and calculating the power loss of the protected action outlet according to the direct current operation mode and the power level information which are acquired in real time and the characteristics of the protected action outlet.
In a third aspect, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where, when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the method for evaluating an operation risk of a dc power transmission system according to any one of the above descriptions.
The operation risk assessment method for the direct current transmission system provided by the embodiment of the invention comprises the following steps: calculating an action risk coefficient of each protection and a power loss amount of an action outlet of each protection; determining an operation risk value of the direct current transmission system according to the action risk coefficient of each protection and the power loss of the action outlet of each protection; wherein, the action risk coefficient and the power loss of the action exit of a protection are calculated by the following method: collecting criterion quantity for protection calculation in a direct current control protection system in real time; calculating an action risk coefficient according to the criterion quantity and a preset threshold corresponding to the criterion quantity; and calculating the power loss of the protected action outlet according to the direct current operation mode and the power level information which are acquired in real time and the characteristics of the protected action outlet. Compared with the prior art, the embodiment of the invention can effectively provide the weak point of the direct current operation risk by monitoring the direct current protection action risk state in real time, thereby evaluating the direct current operation risk in real time and greatly improving the response capability.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a DC power transmission system configuration;
fig. 2 is a schematic flow chart of a method for evaluating an operation risk of a dc power transmission system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the step numbers used herein are for convenience of description only and are not intended as limitations on the order in which the steps are performed.
It is to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
The terms "comprises" and "comprising" indicate the presence of the described features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The term "and/or" refers to and includes any and all possible combinations of one or more of the associated listed items.
The invention relates to a technical scheme for evaluating the running risk of a direct current transmission system in real time, which particularly evaluates the running risk of the direct current transmission system by acquiring relevant data in real time and according to the relevant data acquired in real time. To facilitate understanding of the technical solutions provided by the present invention, the following describes related knowledge of the dc power transmission system and explains related terms related to the present invention.
As shown in fig. 1, the dc power transmission system includes a primary system and a secondary system, where the secondary system includes a control protection system (dc control protection system), and the control protection system is the "brain" of the dc power transmission system and is the core technology of the secondary system. In addition, the primary system is strong electricity and is directly connected into a power grid; the secondary system is weak current, and the primary system is electrically isolated and is connected with the primary system through a control semaphore.
The direct current transmission can quickly and conveniently adjust the current and the power of a direct current line through the converter, so that various adjustments and controls can be realized, the power can be stably output in normal operation, and the reliability of system operation can be improved under the accident condition. One remarkable characteristic of the high-voltage direct-current transmission and the alternating-current transmission is that the size and the direction of the transmission power of a direct-current line can be controlled by quickly adjusting converters at two ends so as to meet the operation requirement of the whole alternating-current and direct-current combined system, namely, the performance of a direct-current transmission system greatly depends on a control system of the direct-current transmission system.
Because the control of the direct current system is realized by changing the open tube section of the converter switching device, and the main measures of the direct current protection action are also completed by the change of the trigger pulse and the locking of the trigger pulse, the control and the control of the direct current system have close functional relationship, are the core of the high-voltage direct current transmission project, and are the basis for ensuring the safe and reliable operation of the direct current transmission system.
The function of the control protection system is introduced by the conventional direct current (similar to flexible direct current), the control protection system acquires the running state information of the primary system, outputs a corresponding control protection instruction according to a set control target, and controls the on-off state of the converter, so that the running state of the direct current transmission system is controlled.
The control protection system is used for protecting the safety of primary equipment under the condition of direct current fault or abnormal condition or quickly isolating the fault when the fault occurs in a corresponding area, so that the safety of the whole direct current system is prevented from being damaged by the fault. For example, when a short-circuit fault occurs, a primary system short-circuit loop can flow a large short-circuit current, and possibly burn out equipment, and at this time, the overcurrent protection can rapidly lock the current converter or trip the alternating current switch to cut off the current loop, so that the equipment is prevented from being damaged.
The direct current protection generally adopts a partition configuration, and generally divides three main categories of direct current side protection, alternating current side protection and direct current line protection into 6 protection partitions ((1) a converter protection area (2), a direct current switch field protection area (3), a neutral bus protection area (4), a grounding electrode lead and a grounding electrode protection area, and (5) a converter station alternating current switch field protection area (6) and a direct current line protection area).
The protection of the extra-high voltage direct current converter is taken as an example and comprises a plurality of protections such as converter short-circuit protection (87 CSY/87 CSD), bridge difference protection (87 CBY/87 CBD), valve group differential protection (87 DCV), alternating current and direct current overcurrent protection (50/51C), converter transformer valve side neutral point offset protection (59 ACVW), alternating current overvoltage protection (59 AC), alternating current low voltage protection (27 AC), direct current overvoltage open-circuit protection (59 DC), bypass switch failure protection (82-BPS), direct current low voltage protection (27 DC), converter transformer neutral point direct current saturation protection (50/51 CTNY50/51 CTND) and the like.
Since the method for evaluating the operation risk of the dc power transmission system provided in the following embodiments of the present invention relates to the criterion quantity, the operation condition and the export characteristic, an example is listed below to illustrate the meaning of the criterion quantity, the operation condition and the export characteristic.
The section I of the direct current overvoltage open circuit protection (59 DC) is taken as an example to illustrate the criterion quantity, the action condition and the outlet characteristic.
Section I criterion formula (action condition): VD > U _ set1& IdN < I _ set
The criterion quantity VD = | UdL-UdM | (high valve) or | UdM-UdN | (low valve), udL, udM and UdN are direct-current line voltage, high-low valve inter-group voltage and neutral point voltage respectively. Criterion IdN is the neutral point current.
Namely, VD > U _ set1 and IdN < I _ set protection I section, namely action, are simultaneously satisfied. U _ set1 and I _ set are respectively set protection action thresholds.
And if the protection meets the action condition, an action outlet is formed, and the outlet characteristic is divided into a switching section and a tripping section (the action thresholds of the two sections are different):
switching the section: control system switching
Tripping I-III section: the valve bank is stopped emergently, the valve bank alternating current breaker is jumped, and the valve bank is isolated.
Typical egress action processing policy types are as follows:
alarm
Control system switching
Valve block lockout pulse
Valve block ESOF
Very polar ESOF
Extreme emergency shutdown at transport station (X-ESOF)
Local station emergency shutdown (Y-ESOF)
Trip valve group AC circuit breaker/simultaneous locking AC circuit breaker
Skip-pole AC circuit breaker/simultaneous locking AC circuit breaker
Valve block isolation
Polar isolation
Reclosing bypass switch (BPS)
Forbidding converter unlocking
In addition, since the embodiment of the present invention also relates to power loss amount calculation, the following description is made on the power loss amount calculation:
the power assumes that a direct-current bipolar 4 valve group operates, the power of each valve group is P, the power loss amount under different exit strategies is different, for example, for alarm and control system switching, the system operating power does not change; for a block lockout/block ESOF, the power P of the block is lost; for single pole blocking, the power 2P of the pole (2 valve groups) is lost, and for the pole emergency shutdown (X-ESOF)/the own station emergency shutdown (Y-ESOF) at the station, the direct current power of the own station is lost, namely 4P is lost.
Referring to fig. 2, an embodiment of the present invention provides a method for evaluating an operation risk of a dc power transmission system, including steps S1 and S2:
s1, calculating an action risk coefficient of each protection and a power loss amount of an action outlet of each protection;
s2, determining an operation risk value of the direct current transmission system according to the action risk coefficient of each protection and the power loss of the action outlet of each protection;
wherein, the action risk coefficient and the power loss of the action exit of a protection are calculated by the following method:
collecting criterion quantity for protection calculation in a direct current control protection system in real time;
calculating an action risk coefficient according to the criterion quantity and a preset threshold value corresponding to the criterion quantity;
and calculating the power loss of the protected action outlet according to the direct current operation mode and the power level information which are acquired in real time and the characteristics of the protected action outlet.
Compared with the prior art, the embodiment of the invention can effectively provide the weak point of the direct current operation risk by monitoring the direct current protection action risk state in real time, thereby evaluating the direct current operation risk in real time and greatly improving the response capability.
As an example of the embodiment of the present invention, the action risk coefficient of each protection is specifically calculated according to the following formula:
wherein X ij N. n, i =1,2, which is the criterion quantity for the ith protectionN is the number of protection in the DC control protection system, k is the total number of action conditions required to be met by the ith protection, and R i Action risk factor for the ith protection, X thij Is equal to X ij A corresponding set threshold.
As an example of the embodiment of the present invention, the determining an operation risk value of the dc power transmission system according to the action risk coefficient of each protection and the power loss amount of the action outlet of each protection specifically includes:
judging whether at least one protected action risk coefficient is in a first preset range, and if so, determining the operation risk value of the direct-current power transmission system as follows: p loss ＝Max{P lossi }; wherein, P loss For the operational risk value of the DC transmission system, { P lossi The action risk coefficient belongs to a set of power loss quantities of protected action outlets in a first preset range, and i is less than or equal to n;
if not, judging whether at least one protected action risk coefficient is in a second preset range; if yes, determining the operation risk value of the direct current transmission system as follows: p is loss ＝Max{P lossi }; wherein, { P lossi The action risk coefficient belongs to a set of power loss quantities of protected action outlets in a second preset range, and i is less than or equal to n; if not, determining the operation risk value of the direct current transmission system as 0; wherein the second preset range is (x 1, x 2)]The first preset range is (x 2, 1), x1<x2<1。
In the present embodiment, P loss ＝Max{P lossi And knowing that the running risk value of the direct current transmission system is the risk value of the power loss amount.
For ease of understanding, the following description will be made by taking an example:
assuming that 2 protections exist in the direct-current control protection system, if the action risk coefficients of the two protections are both within a first preset range, the power loss amount of the first protection is greater than the power loss amount of the 2 protections, and the running risk value of the direct-current transmission system is the power loss amount of the first protection.
In the embodiments of the present invention, it should be noted. The values of x1 and x2 may be adjusted based on the protection characteristics and typical values under normal operating conditions.
In order to facilitate an operator to grasp the dc operating state information in real time, as an example of the embodiment of the present invention, the method for evaluating the operating risk of the dc power transmission system further includes:
and displaying the operation risk value of the direct current transmission system and the action risk coefficient corresponding to the operation risk value of the direct current transmission system in real time.
As an example of the embodiment of the present invention, the method for evaluating an operation risk of a dc power transmission system further includes:
grading the protection action risk according to the protection action risk coefficient to obtain the protection action risk grade;
and displaying the protection action risk state in real time according to the protection action risk level.
As an example of the embodiment of the present invention, the ranking the protection action risk according to the protection action risk coefficient specifically includes:
if the protected action risk coefficient is within the first preset range, the protected action risk belongs to a serious alarm category;
if the protected action risk coefficient is within the second preset range, the protected action risk belongs to a slight alarm level;
and if the protected action risk coefficient is not in the first preset range or the second preset range, the protected action risk belongs to the safety level.
As an example of the embodiment of the present invention, the first preset range is (0.9,0.98), and the first preset range is (0.98,1).
In the embodiment of the present invention, specifically, if the risk coefficient of the protection action is within the range of (0.98,1), the risk level of the protection action belongs to a serious alarm level, and when displaying, a serious alarm prompt is displayed; if the protection action risk coefficient is in the range of (0.9,0.98), the protection action risk belongs to a slight alarm level, and a slight alarm prompt is displayed when the protection action risk coefficient is displayed, and if the protection action risk is less than or equal to 0.9, the protection action risk belongs to a safety level, and a safety prompt is displayed when the protection action risk coefficient is displayed.
As an example of the embodiment of the present invention, the method for evaluating an operation risk of a dc power transmission system further includes:
and for the protection related to the stress index of the electrical equipment, prompt information is given to the corresponding equipment running state according to the action risk coefficient.
An embodiment of the present invention further provides a device for evaluating an operation risk of a dc power transmission system, including:
the calculation module is used for calculating the action risk coefficient of each protection and the power loss amount of the action outlet of each protection;
the operation risk value determining module is used for determining the operation risk value of the direct current transmission system according to the action risk coefficient of each protection and the power loss amount of the action outlet of each protection;
wherein, the action risk coefficient and the power loss of the action exit of a protection are calculated by the following method:
collecting criterion quantity for protection calculation in a direct current control protection system in real time;
calculating an action risk coefficient according to the criterion quantity and a preset threshold value corresponding to the criterion quantity;
and calculating the power loss of the protected action outlet according to the direct current operation mode and the power level information which are acquired in real time and the characteristics of the protected action outlet.
In a third aspect, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where, when the computer program runs, a device in which the computer-readable storage medium is located is controlled to execute the method for evaluating an operation risk of a dc power transmission system according to any one of the above descriptions.
It should be noted that, all or part of the flow in the method according to the above embodiments of the present invention may also be implemented by a computer program instructing related hardware, where the computer program may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above embodiments of the method may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be further noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals in accordance with legislation and patent practice.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A method for evaluating the operation risk of a direct current transmission system is characterized by comprising the following steps:
calculating an action risk coefficient of each protection and a power loss amount of an action outlet of each protection;
determining an operation risk value of the direct current transmission system according to the action risk coefficient of each protection and the power loss of the action outlet of each protection;
wherein, the action risk coefficient and the power loss of the action exit of a protection are calculated by the following method:
collecting criterion quantity for protection calculation in a direct current control protection system in real time;
calculating an action risk coefficient according to the criterion quantity and a preset threshold corresponding to the criterion quantity;
calculating the power loss of the protected action outlet according to the DC operation mode and the power level information which are collected in real time and the characteristics of the protected action outlet;
wherein, the action risk coefficient of each protection is calculated according to the following formula:
wherein X ij N, n is the number of protection in the direct current control protection system, k is the total number of action conditions required to be met by the ith protection, and R is i Action risk factor for the ith protection, X thij Is equal to X ij A corresponding set threshold;
the determining an operation risk value of the direct current transmission system according to the action risk coefficient of each protection and the power loss amount of the action outlet of each protection specifically includes:
judging whether at least one protected action risk coefficient is in a first preset range, and if so, determining the operation risk value of the direct current power transmission system as follows: p loss＝ Max{P lossi }; wherein, P loss For the running risk value, { P ] of the DC transmission system lossi The action risk coefficient belongs to a set of power loss quantities of protected action outlets in a first preset range, and i is less than or equal to n;
if not, judging whether at least one protected action risk coefficient is in a second preset range; if yes, determining the operation risk value of the direct current transmission system as follows: p loss ＝Max{P lossi }; wherein, { P lossi The action risk coefficient belongs to a set of power loss quantities of protected action outlets in a second preset range, and i is less than or equal to n; if not, the operation of the direct current transmission system is carried outThe risk value is determined to be 0; wherein the second predetermined range is (x 1, x 2)]The first preset range is (x 2, 1), x1<x2<1。
2. The method for assessing operational risk of a direct current transmission system according to claim 1, wherein the method for assessing operational risk of a direct current transmission system further comprises:
and displaying the operation risk value of the direct current power transmission system and the action risk coefficient corresponding to the operation risk value of the direct current power transmission system in real time.
3. The direct-current transmission system operation risk assessment method according to any one of claims 1 to 2, characterized by further comprising:
grading the protection action risk according to the protection action risk coefficient to obtain the protection action risk level;
and displaying the protection action risk state in real time according to the protection action risk level.
4. The method according to claims 1 to 2, characterized in that the method further comprises:
and for the protection related to the stress index of the electrical equipment, prompt information is given to the corresponding equipment running state according to the action risk coefficient.
5. The method according to claim 3, wherein the step of ranking the protection action risk according to the action risk coefficient of protection specifically comprises:
if the protected action risk coefficient is within the first preset range, protecting the action risk to belong to a serious alarm level;
if the protected action risk coefficient is within the second preset range, protecting the action risk to belong to a slight alarm level;
and if the protected action risk coefficient is not in the first preset range or the second preset range, the protected action risk belongs to the safety level.
6. The method according to claim 5, wherein the first predetermined range is (0.9,0.98) and the first predetermined range is (0.98,1).
7. An apparatus for assessing operational risk of a DC power transmission system, comprising:
the calculation module is used for calculating the action risk coefficient of each protection and the power loss amount of the action outlet of each protection;
the operation risk value determining module is used for determining an operation risk value of the direct-current transmission system according to the action risk coefficient of each protection and the power loss amount of the action outlet of each protection;
wherein, the action risk coefficient and the power loss of the action exit of a protection are calculated by the following method:
collecting criterion quantity for protection calculation in a direct current control protection system in real time;
calculating an action risk coefficient according to the criterion quantity and a preset threshold corresponding to the criterion quantity;
calculating the power loss of the protected action outlet according to the DC operation mode and the power level information which are collected in real time and the characteristics of the protected action outlet;
wherein, the action risk coefficient of each protection is calculated according to the following formula:
wherein X ij For the criterion quantity of the ith protectionN, n is the number of protection in the direct current control protection system, k is the total number of action conditions required to be met by the ith protection, and R is i Action risk factor for the ith protection, X thij Is equal to X ij A corresponding set threshold;
the operation risk value determining module is configured to determine an operation risk value of the dc power transmission system according to the action risk coefficient of each protection and the power loss amount of the action outlet of each protection, and specifically includes:
judging whether at least one protected action risk coefficient is in a first preset range, and if so, determining the operation risk value of the direct-current power transmission system as follows: p loss＝ Max{P lossi }; wherein, P loss For the operational risk value of the DC transmission system, { P lossi The action risk coefficient belongs to a set of power loss quantities of protected action outlets in a first preset range, and i is less than or equal to n;
if not, judging whether at least one protected action risk coefficient is in a second preset range; if yes, determining the operation risk value of the direct current transmission system as follows: p loss ＝Max{P lossi }; wherein, { P lossi The action risk coefficient belongs to a set of power loss quantities of protected action outlets in a second preset range, and i is less than or equal to n; if not, determining the operation risk value of the direct current transmission system as 0; wherein the second preset range is (x 1, x 2)]The first preset range is (x 2, 1), x1<x2<1。
8. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for assessing risk of operating a dc power transmission system according to any one of claims 1 to 6.
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