CN111668802A - Method and system for determining redundancy number of relay protection device - Google Patents
Method and system for determining redundancy number of relay protection device Download PDFInfo
- Publication number
- CN111668802A CN111668802A CN202010299703.4A CN202010299703A CN111668802A CN 111668802 A CN111668802 A CN 111668802A CN 202010299703 A CN202010299703 A CN 202010299703A CN 111668802 A CN111668802 A CN 111668802A
- Authority
- CN
- China
- Prior art keywords
- protection device
- relay protection
- components
- cost
- reliability
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a method and a system for determining the redundancy number of a relay protection device, wherein the method comprises the following steps: selecting a plurality of redundancy modes; calculating the failure rate of each component under different redundancy modes according to the reliability of each component; combining all the components into a relay protection device; based on a series reliability model of the relay protection device, combining all components in the same redundancy mode respectively, and calculating the failure rate of the relay protection device based on the failure rates of all the components in different redundancy modes; and determining the redundancy quantity of the minimum cost of the relay protection device under the condition that the relay protection device meets the reliability requirement based on the failure rate of the relay protection device. The method for determining the redundancy number of the relay protection device in the technical scheme of the invention ensures that the reliability requirement of the relay protection is met and the redundancy cost is saved.
Description
Technical Field
The invention relates to the technical field of relay protection of power systems, in particular to a method and a system for determining the redundancy number of a relay protection device.
Background
The relay protection device is used as a core device of a power grid, and the automatic control of the relay protection device plays a key role in safe and stable operation of the power grid. However, in the prior art, almost all components forming various protection devices depend on European and American imports, and huge potential safety hazards exist, so that the nationwide produced relay protection device components attract more and more attention, and the problem that whether the nationwide produced components can meet the application requirements of relay protection is more and more obvious. And the performance of the domestic components and parts has a certain difference with the imported components and parts, and the domestic components and parts need to be designed in a redundancy way, so that the system can still work normally when the parts have faults, the fault probability of the system is reduced, and the reliability of the relay protection device is improved.
The prior art scheme mainly focuses on the research on the whole relay protection device, generally defaults to an imported product for components inside the protection device, and lacks of the research on the components of nationwide chemical relay protection devices. However, after the home-made components are used for replacement, the performance of the components may be reduced, which may result in the reliability of the relay protection device being reduced. The reliability of the relay protection device can be improved only by considering the redundancy of the components, and meanwhile, on the premise of meeting the reliability of the relay protection device, the method for determining the redundancy number of the components of the nationwide productive relay protection device can be researched by considering the cost problem of the redundancy.
Disclosure of Invention
The technical scheme of the invention provides a method and a system for determining the redundancy number of a relay protection device, which aim to solve the problem of cost of redundancy in consideration on the premise of meeting the reliability of the relay protection device.
In order to solve the above problem, the present invention provides a method for determining a redundancy number of a relay protection device, the method comprising:
selecting a plurality of redundancy modes;
calculating the failure rate of each component under different redundancy modes according to the reliability of each component;
combining all the components into a relay protection device;
based on a series reliability model of the relay protection device, combining all components in the same redundancy mode respectively, and calculating the failure rate of the relay protection device based on the failure rates of all the components in different redundancy modes;
and determining the redundancy quantity of the minimum cost of the relay protection device under the condition that the relay protection device meets the reliability requirement based on the failure rate of the relay protection device.
Preferably, the determining that the relay protection device meets the redundancy mode of minimum cost under the reliability requirement includes:
subtracting the number of the components with the highest cost in the relay protection device until the number of the components with the highest cost is 1 or the relay protection device does not meet the reliability requirement;
reducing the number of the components from high to low in sequence from the rest components according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and determining the redundancy quantity which meets the reliability requirement and has the minimum cost of the relay protection device.
Preferably, the calculating the failure rate of the relay protection device based on the series reliability model of the relay protection device includes:
according to a series reliability model of the relay protection device, all components are combined in the same redundancy mode respectively, failure rates of the relay protection device under different redundancy modes are obtained, and then:
wherein b is 2,3,4 …, b is the number of each component,
the failure rate of each component under different redundancy modes is shown.
Preferably, the method comprises the following steps:
setting the minimum requirement of the reliability of the relay protection device, namely the maximum failure rate lambda allowed by the relay protection device0；
In combinations that meet the reliability requirements of the relaying protection device, i.e. λ ≦ λ0Selecting a combination mode with the lowest cost, namely selecting the minimum number b of elements meeting the reliability and recording the number b as b0And then:
wherein b is 2,3,4 …, b is the number of each component, ckThe cost of each component.
Preferably, the method further comprises the following steps:
after the selected multiple redundancy modes are combined, cost optimization is sought, and the cost of n components is set to be a from top to bottom in sequence1＞a2＞a3＞a4＞a5＞a6…＞an(ii) a The minimum number of elements satisfying reliability is b0；
Firstly, the cost is a1The number of components is reduced by 1, then a1The number of the components is b0-1 and the number of the other components is b0And calculating the failure rate lambda of the relay protection device:
if λ is less than or equal to λ0Then continue to subtract a1Number of components up to a1The number of the components is 1;
if λ > λ0Then subtract a2The number of components is increased until the relay protection reliability does not meet the requirement;
reducing the number of the components from high to low in sequence from the rest components according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and by analogy, the redundancy quantity of each component when the reliability requirement of the relay protection device is met and the cost is the minimum is determined according to the sequence from high cost to low cost.
Based on another aspect of the present invention, the present invention provides a system for determining redundancy number of a relay protection device, the system comprising:
the selection unit is used for selecting a plurality of redundancy modes;
the first calculating unit is used for calculating the failure rate of each component in different redundancy modes according to the reliability of each component;
the combination unit is used for combining all the components into a relay protection device;
the second calculation unit is used for combining all the components in the same redundancy mode respectively based on the series reliability model of the relay protection device and the failure rates of all the components in different redundancy modes, and calculating the failure rate of the relay protection device;
and the determining unit is used for determining the redundancy quantity of the minimum cost of the relay protection device under the condition that the relay protection device meets the reliability requirement based on the failure rate of the relay protection device.
Preferably, the determining unit is configured to determine a redundancy mode in which the relay protection device meets the minimum cost under the reliability requirement, and includes:
subtracting the number of the components with the highest cost in the relay protection device until the number of the components with the highest cost is 1 or the relay protection device does not meet the reliability requirement;
reducing the number of the components from high to low in sequence from the rest components according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and determining the redundancy quantity which meets the reliability requirement and has the minimum cost of the relay protection device.
Preferably, the second calculating unit is configured to combine the components in the same redundancy mode respectively based on a series reliability model of the relay protection device, and calculate a failure rate of the relay protection device, including:
according to a series reliability model of the relay protection device, all components are combined in the same redundancy mode respectively, failure rates of the relay protection device under different redundancy modes are obtained, and then:
wherein b is 2,3,4 …, b is the number of each component,
the failure rate of each component under different redundancy modes is shown.
Preferably, the method comprises the following steps:
setting the minimum requirement of the reliability of the relay protection device, namely the maximum failure rate lambda allowed by the relay protection device0；
In combinations that meet the reliability requirements of the relaying protection device, i.e. λ ≦ λ0Selecting a combination mode with the lowest cost, namely selecting the minimum number b of elements meeting the reliability and recording the number b as b0And then:
wherein b is 2,3,4 …, b is the number of each component, ckThe cost of each component.
Preferably, the method further comprises the following steps:
after the selected multiple redundancy modes are combined, cost optimization is sought, and the cost of n components is set to be a from top to bottom in sequence1＞a2＞a3＞a4＞a5＞a6…＞an(ii) a The minimum number of elements satisfying reliability is b0；
Firstly, the cost is a1The number of components is reduced by 1, then a1The number of the components is b0-1 and the number of the other components is b0And calculating the failure rate lambda of the relay protection device:
if λ is less than or equal to λ0Then continue to subtract a1Number of components up to a1The number of the components is 1;
if λ > λ0Then subtract a2The number of components is increased until the relay protection reliability does not meet the requirement;
reducing the number of the components from high to low in sequence from the rest components according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and by analogy, the redundancy quantity of each component when the reliability requirement of the relay protection device is met and the cost is the minimum is determined according to the sequence from high cost to low cost.
The technical scheme of the invention provides a method and a system for determining the redundancy number of a relay protection device, wherein the method comprises the following steps: selecting a plurality of redundancy modes; calculating the failure rate of each component under different redundancy modes according to the reliability of each component; combining all the components into a relay protection device; based on a series reliability model of the relay protection device, combining all components in the same redundancy mode respectively, and calculating the failure rate of the relay protection device based on the failure rates of all the components in different redundancy modes; and determining the redundancy quantity of the minimum cost of the relay protection device under the condition that the relay protection device meets the reliability requirement based on the failure rate of the relay protection device. The technical scheme of the invention provides a method for determining the redundancy number of components of a nationwide productive relay protection device, which comprises the steps of selecting a proper redundancy mode by analyzing the logic principles of different redundancy modes; respectively calculating the failure rate of each component under different redundancy modes and the failure rate of the relay protection device after different components are combined by combining the reliability of each component; and then, the redundancy cost is optimized by subtracting the number of the components from the high cost to the low cost in sequence, so that the requirement on the reliability of the relay protection is met, and the redundancy cost is saved.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flowchart of a method for determining the redundancy number of a relay protection device according to a preferred embodiment of the present invention;
FIG. 2 is a logic diagram of a redundancy configuration with N according to the preferred embodiment of the present invention;
fig. 3 is a reliability model of a second redundancy mode of components of the relay protection device according to the preferred embodiment of the invention;
FIG. 4 is a flow chart of a component redundancy cost optimization method according to a preferred embodiment of the present invention; and
fig. 5 is a diagram of a system for determining the redundancy number of a relay protection device according to a preferred embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of a method for determining the redundancy number of a relay protection device according to a preferred embodiment of the present invention. The application provides a method for determining the redundant number of components of a nationwide productive relay protection device, which comprises the following steps: firstly, selecting a proper redundancy mode from different redundancy modes; according to the reliability of each component, the failure rate of each component under different redundancy modes is calculated; according to a series reliability model of the relay protection device, based on failure rates of all components under different redundancy modes, the failure rate of the relay protection device after the components are combined is obtained, and a redundancy mode with the minimum cost under the condition of meeting reliability requirements is selected; and subtracting the number of the components with the highest cost until the number of the components is 1 or the relay protection reliability requirement is not met, subtracting the number of the components with the second highest cost, and determining the redundancy number of each component when the relay protection reliability requirement is met and the cost is the minimum according to the sequence from high to low by analogy.
As shown in fig. 1, the present application provides a method for determining a redundancy number of a relay protection device, the method comprising:
preferably, in step 101: and selecting a plurality of redundancy modes. The invention selects a proper redundancy mode from different redundancy modes; in the step (one), the one-out-of-N redundancy mode refers to a redundancy mode in which N modules are independent and output logic phases or, if only 1 module acts, the module acts as an outlet. When N modules are used for or redundancy, the entire module fails only when all the N modules fail.
Setting the same failure rate lambda of the components of the same type, and then taking the failure rate expression in a redundancy mode as follows: lambda [ alpha ]2＝λ2。
Preferably, at step 102: and calculating the failure rate of each component under different redundancy modes according to the reliability of each component. According to the reliability of each component, the failure rate of each component under different redundancy modes is calculated; the failure rate of each component is obtained according to the reliability of the different components, and further, the failure rates of the different components are substituted according to the obtained failure rate expressions of the different redundancy modes to obtain the failure rates of the components in the different redundancy modes.
Preferably, in step 103: combining all the components into a relay protection device;
preferably, at step 104: and based on a series reliability model of the relay protection device, combining all the components in the same redundancy mode respectively, and calculating the failure rate of the relay protection device based on the failure rates of all the components in different redundancy modes. Preferably, calculating the failure rate of the relay protection device based on the series reliability model of the relay protection device includes:
according to a series reliability model of the relay protection device, all components are combined in the same redundancy mode respectively, failure rates of the relay protection device under different redundancy modes are obtained, and then:
wherein b is 2,3,4 …, b is the number of each component,
the failure rate of each component under different redundancy modes is shown.
Preferably, at step 105: and determining the redundancy quantity of the minimum cost of the relay protection device under the condition that the relay protection device meets the reliability requirement based on the failure rate of the relay protection device.
Preferably, the determining the redundancy mode of the relay protection device meeting the minimum cost under the reliability requirement comprises:
subtracting the number of the components with the highest cost in the relay protection device until the number of the components with the highest cost is 1 or the relay protection device does not meet the reliability requirement;
reducing the number of the components from the rest components from high to low in sequence according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and determining the redundancy quantity which meets the reliability requirement and has the minimum cost of the relay protection device.
Preferably, the method comprises:
setting the minimum requirement of the reliability of the relay protection device, namely the maximum failure rate lambda allowed by the relay protection device0；
In combinations that meet the reliability requirements of the relaying protection device, i.e. λ ≦ λ0Selecting a combination mode with the lowest cost, namely selecting the minimum number b of elements meeting the reliability and recording the number b as b0And then:
wherein b is 2,3,4 …, b is the number of each component, ckThe cost of each component.
Preferably, the method further comprises:
after the selected multiple redundancy modes are combined, cost optimization is sought, and the cost of n components is set to be a from top to bottom in sequence1＞a2＞a3＞a4＞a5＞a6…＞an(ii) a The minimum number of elements satisfying reliability is b0；
Firstly, the cost is a1The number of components is reduced by 1, then a1The number of the components is b0-1 and the number of the other components is b0And calculating the failure rate lambda of the relay protection device:
if λ is less than or equal to λ0Then continue to subtract a1Number of components up to a1The number of the components is 1;
if λ > λ0Then subtract a2The number of components is increased until the relay protection reliability does not meet the requirement;
reducing the number of the components from the rest components from high to low in sequence according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and by analogy, the redundancy quantity of each component when the reliability requirement of the relay protection device is met and the cost is the minimum is determined according to the sequence from high cost to low cost.
The invention aims to provide a method for determining the redundancy quantity of components of a nationwide produced relay protection device, which can produce positive effects, considers the influence of the nationwide produced components on the reliability of the relay protection device after the nationwide produced components are replaced, and combines the components in a redundancy mode to reduce the fault probability of the components so that the reliability of the relay protection device meets the requirements; secondly, the redundancy cost of the components is reduced by a method of optimizing the redundancy cost by subtracting the number of the components from the high cost to the low cost in sequence, and the nationwide productive relay protection device can meet the reliability requirement of relay protection and save the redundancy cost by adopting a corresponding redundancy mode; finally, the method has simple calculation and strong feasibility, can accurately determine the redundancy quantity of each component of the relay protection device when the reliability requirement of the relay protection is met and the minimum cost is met, and has strong practicability in engineering practice.
The following illustrates embodiments of the invention:
fig. 1 is a schematic flow chart of a method for determining the redundancy number of components of a nationwide productive relay protection device according to an embodiment of the present invention. The following failure rate expressions of four redundancy modes are listed by the reliability principle, as shown in table 1.
TABLE 1 failure rate expression for redundancy mode
According to the reliability of different components, the failure rate of each component is obtained as shown in table 2:
TABLE 2 failure rate of components of relay protection device
Then, the failure rates of the components of the relay protection device are substituted into table 1, and the failure rates of the components under four different redundancy modes are obtained as shown in table 3:
TABLE 3 failure rate of different redundancy modes of each component of the relay protection device
And each component in the relay protection device adopts a two-out-of-one redundancy mode, and the failure rate of the relay protection device is the sum of the failure rates of the components in the two-out-of-one redundancy mode. Similarly, the failure rates of the relay protection device in the redundancy mode of one out of three, one out of four and one out of five of each component are shown in table 4.
TABLE 4 different redundancy mode failure rates of relay protection device
The invention sets the maximum failure rate lambda allowed by the relay protection device0＝0.0038x10-6/h。
Based on the failure rate of the relay protection device in table 4, the relay protection device meets the reliability requirement when each component adopts a redundancy mode of one out of three, one out of four and one out of five, so that the redundancy mode with the lowest cost is selected, namely the redundancy number of each component is 3.
The flow chart of the component redundancy cost optimization method is shown in fig. 4, the cost of each component of the relay protection device is shown in table 5, and the cost of each component is sequentially from top to bottom, namely CPU > FPGA > storage > DSP > ADC > power supply.
TABLE 5 component cost of the relay protection device
Firstly, the redundant number of CPU componentsSubtracting 1, the number of the CPUs is 2, the number of the other components is 3, and the failure rate of the relay protection device is 1.35x10-9/h＜λ0And the requirement of relay protection reliability is met. And if the number of the CPU components is continuously reduced by 1, the failure rate of the relay protection device is 36.90x10-6/h＞λ0The requirement of relay protection reliability is not met, so that the redundant quantity of the CPU components is determined to be 2;
according to the invention, the redundancy number of the FPGA components is reduced by 1, the number of the CPU and the FPGA is 2, the number of the other components is 3, and the failure rate of the relay protection device is 2.70x10-9/h＜λ0And the requirement of relay protection reliability is met. And continuously reducing the number of the FPGA components by 1, and determining the failure rate of the relay protection device to be 36.74x10-6/h＞λ0The requirement of relay protection reliability is not met, so that the redundancy number of the FPGA components is determined to be 2;
continuously reducing the redundant number of the storage components by 1, wherein the number of the CPU, the FPGA and the storage components is 2, and the number of the other components is 3, so that the failure rate of the relay protection device is 4.05x10-9/h＞λ0The requirement of relay protection reliability is not met, so that the redundancy quantity of the storage components is determined to be 3;
continuously reducing the redundant number of the DSP components by 1, wherein the number of the CPU, the FPGA and the DSP is 2, and the number of the other components is 3, so that the failure rate of the relay protection device is 4.05x10-9/h＞λ0The requirement of relay protection reliability is not met, so that the redundant number of DSP components is determined to be 3;
continuously reducing the redundant number of the ADC components by 1, wherein the number of the CPU, the FPGA and the ADC is 2, and the number of the other components is 3, so that the failure rate of the relay protection device is 3.21x10-9/h＜λ0And the requirement of relay protection reliability is met. And if the number of ADC components is reduced by 1, the failure rate of the relay protection device is 22.56x10-6/h＞λ0The requirement of relay protection reliability is not met, so that the redundant number of ADC components is determined to be 2;
and finally, reducing the redundant number of the power supply components by 1, wherein the number of the CPU, the FPGA, the ADC and the power supply is 2, and the number of the other components is 3, so that the failure rate of the relay protection device is 3.34x10-9/h＜λ0And the requirement of relay protection reliability is met. And if the number of the power supply components is reduced by 1 continuously, the failure rate of the relay protection device is 11.40x10-6/h＞λ0And the requirement on the reliability of relay protection is not met, so that the redundancy quantity of the power supply components is determined to be 2.
Therefore, the redundancy mode of the CPU, the FPGA, the ADC and the power supply components of the relay protection device is determined to be one out of two, and the redundancy mode of the DSP and the storage components is determined to be one out of three, so that the reliability requirement of the relay protection is met, and the cost is minimum. Therefore, the redundancy quantity of the CPU, the FPGA, the ADC and the power supply element is determined to be 2, and the redundancy quantity of the DSP and the storage element is determined to be 3.
Fig. 5 is a diagram of a system for determining the redundancy number of a relay protection device according to a preferred embodiment of the present invention. As shown in fig. 5, the present invention provides a system for determining a redundancy number of a relay protection device, the system comprising:
the selecting unit 501 is used for selecting a plurality of redundancy modes. The invention selects a proper redundancy mode from different redundancy modes; in the step (one), the one-out-of-N redundancy mode refers to a redundancy mode in which N modules are independent and output logic phases or, if only 1 module acts, the module acts as an outlet. When N modules are used for or redundancy, the entire module fails only when all the N modules fail.
Setting the same failure rate lambda of the components of the same type, and then taking the failure rate expression in a redundancy mode as follows: lambda [ alpha ]2＝λ2。
The first calculating unit 502 is configured to calculate failure rates of the components in different redundancy modes according to the reliability of the components. According to the reliability of each component, the failure rate of each component under different redundancy modes is calculated; the failure rate of each component is obtained according to the reliability of the different components, and further, the failure rates of the different components are substituted according to the obtained failure rate expressions of the different redundancy modes to obtain the failure rates of the components in the different redundancy modes.
A combination unit 503, configured to combine the components into a relay protection device;
and a second calculating unit 504, configured to combine the components in the same redundancy mode based on the series reliability model of the relay protection device, and calculate the failure rate of the relay protection device based on the failure rates of the components in different redundancy modes.
Preferably, the second calculating unit is configured to combine the components in the same redundancy mode respectively based on a series reliability model of the relay protection device, and calculate a failure rate of the relay protection device, including:
according to a series reliability model of the relay protection device, all components are combined in the same redundancy mode respectively, failure rates of the relay protection device under different redundancy modes are obtained, and then:
wherein b is 2,3,4 …, b is the number of each component,
the failure rate of each component under different redundancy modes is shown.
And the determining unit 505 is configured to determine, based on the failure rate of the relay protection device, the redundancy quantity of the relay protection device meeting the minimum cost under the reliability requirement.
Preferably, the determining unit 505 is configured to determine a redundancy mode that the relay protection device meets the minimum cost under the reliability requirement, and includes:
subtracting the number of the components with the highest cost in the relay protection device until the number of the components with the highest cost is 1 or the relay protection device does not meet the reliability requirement;
reducing the number of the components from the rest components from high to low in sequence according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and determining the redundancy quantity which meets the reliability requirement and has the minimum cost of the relay protection device.
Preferably, the method comprises the following steps:
setting the minimum requirement of the reliability of the relay protection device, namely the maximum failure rate lambda allowed by the relay protection device0；
In combinations that meet the reliability requirements of the relaying protection device, i.e. λ ≦ λ0Selecting a combination mode with the lowest cost, namely selecting the minimum number b of elements meeting the reliability and recording the number b as b0And then:
wherein b is 2,3,4 …, b is the number of each component, ckThe cost of each component.
Preferably, the method further comprises the following steps:
after the selected multiple redundancy modes are combined, cost optimization is sought, and the cost of n components is set to be a from top to bottom in sequence1＞a2＞a3＞a4＞a5＞a6…＞an(ii) a The minimum number of elements satisfying reliability is b0；
Firstly, the cost is a1The number of components is reduced by 1, then a1The number of the components is b0-1 and the number of the other components is b0And calculating the failure rate lambda of the relay protection device:
if λ is less than or equal to λ0Then continue to subtract a1Number of components up to a1The number of the components is 1;
if λ > λ0Then subtract a2The number of components is increased until the relay protection reliability does not meet the requirement;
reducing the number of the components from the rest components from high to low in sequence according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and by analogy, the redundancy quantity of each component when the reliability requirement of the relay protection device is met and the cost is the minimum is determined according to the sequence from high cost to low cost.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a// the [ device, component, etc ]" are to be interpreted openly as at least one instance of a device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (10)
1. A method for determining a redundancy number of a relay protection device, the method comprising:
selecting a plurality of redundancy modes;
calculating the failure rate of each component under different redundancy modes according to the reliability of each component;
combining all the components into a relay protection device;
based on a series reliability model of the relay protection device, combining all components in the same redundancy mode respectively, and calculating the failure rate of the relay protection device based on the failure rates of all the components in different redundancy modes;
and determining the redundancy quantity of the minimum cost of the relay protection device under the condition that the relay protection device meets the reliability requirement based on the failure rate of the relay protection device.
2. The method of claim 1, wherein the determining the redundancy mode that the relay protection device meets the minimum cost under the reliability requirement comprises:
subtracting the number of the components with the highest cost in the relay protection device until the number of the components with the highest cost is 1 or the relay protection device does not meet the reliability requirement;
reducing the number of the components from high to low in sequence from the rest components according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and determining the redundancy quantity which meets the reliability requirement and has the minimum cost of the relay protection device.
3. The method of claim 1, wherein calculating the failure rate of the relay protection device based on a series reliability model of the relay protection device comprises:
according to a series reliability model of the relay protection device, all components are combined in the same redundancy mode respectively, failure rates of the relay protection device under different redundancy modes are obtained, and then:
wherein b is 2,3,4 …, b is the number of each component,
the failure rate of each component under different redundancy modes is shown.
4. The method of claim 3, comprising:
setting the minimum requirement of the reliability of the relay protection device, namely the maximum failure rate lambda allowed by the relay protection device0；
In combinations that meet the reliability requirements of the relaying protection device, i.e. λ ≦ λ0Selecting a combination mode with the lowest cost, namely selecting the minimum number b of elements meeting the reliability and recording the number b as b0And then:
wherein b is 2,3,4 …, b is the number of each component, ckThe cost of each component.
5. The method of claim 4, further comprising:
after the selected multiple redundancy modes are combined, cost optimization is sought, and the cost of n components is set to be a from top to bottom in sequence1＞a2＞a3＞a4＞a5＞a6…＞an(ii) a The minimum number of elements satisfying reliability is b0；
Firstly, the cost is a1The number of components is reduced by 1, then a1The number of the components is b0-1 and the number of the other components is b0And calculating the failure rate lambda of the relay protection device:
if λ is less than or equal to λ0Then continue to subtract a1Number of components up to a1The number of the components is 1;
if λ > λ0Then subtract a2The number of components is increased until the relay protection reliability does not meet the requirement;
reducing the number of the components from high to low in sequence from the rest components according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and by analogy, the redundancy quantity of each component when the reliability requirement of the relay protection device is met and the cost is the minimum is determined according to the sequence from high cost to low cost.
6. A system for determining a redundancy number for a relay protection device, the system comprising:
the selection unit is used for selecting a plurality of redundancy modes;
the first calculating unit is used for calculating the failure rate of each component in different redundancy modes according to the reliability of each component;
the combination unit is used for combining all the components into a relay protection device;
the second calculation unit is used for combining all the components in the same redundancy mode based on a series reliability model of the relay protection device and calculating the failure rate of the relay protection device based on the failure rates of all the components in different redundancy modes;
and the determining unit is used for determining the redundancy quantity of the minimum cost of the relay protection device under the condition that the relay protection device meets the reliability requirement based on the failure rate of the relay protection device.
7. The system of claim 6, wherein the determining unit is configured to determine a redundancy mode of the relay protection device that meets a minimum cost under a reliability requirement, and the redundancy mode comprises:
subtracting the number of the components with the highest cost in the relay protection device until the number of the components with the highest cost is 1 or the relay protection device does not meet the reliability requirement;
reducing the number of the components from high to low in sequence from the rest components according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and determining the redundancy quantity which meets the reliability requirement and has the minimum cost of the relay protection device.
8. The system of claim 6, wherein the second calculating unit is configured to combine the components in the same redundancy manner based on a series reliability model of the relay protection device, and calculate a failure rate of the relay protection device, and includes:
according to a series reliability model of the relay protection device, all components are combined in the same redundancy mode respectively, failure rates of the relay protection device under different redundancy modes are obtained, and then:
wherein b is 2,3,4 …, b is the number of each component,
the failure rate of each component under different redundancy modes is shown.
9. The system of claim 8, comprising:
setting the minimum requirement of the reliability of the relay protection device, namely the maximum failure rate lambda allowed by the relay protection device0；
In combinations that meet the reliability requirements of the relaying protection device, i.e. λ ≦ λ0Selecting a combination mode with the lowest cost, namely selecting the minimum number b of elements meeting the reliability and recording the number b as b0And then:
wherein b is 2,3,4 …, b is the number of each component, ckThe cost of each component.
10. The system of claim 9, further comprising:
after the selected multiple redundancy modes are combined, cost optimization is sought, and the cost of n components is set to be a from top to bottom in sequence1＞a2＞a3＞a4＞a5＞a6…＞an(ii) a The minimum number of elements satisfying reliability is b0；
Firstly, the cost is a1The number of components is reduced by 1, then a1The number of the components is b0-1 and the number of the other components is b0And calculating the failure rate lambda of the relay protection device:
if λ is less than or equal to λ0Then continue to subtract a1Number of components up to a1The number of the components is 1;
if λ > λ0Then subtract a2The number of components is increased until the relay protection reliability does not meet the requirement;
reducing the number of the components from high to low in sequence from the rest components according to the cost until the number of the reduced components is 1 or the relay protection device does not meet the reliability requirement;
and by analogy, the redundancy quantity of each component when the reliability requirement of the relay protection device is met and the cost is the minimum is determined according to the sequence from high cost to low cost.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010299703.4A CN111668802B (en) | 2020-04-16 | 2020-04-16 | Method and system for determining redundancy number of relay protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010299703.4A CN111668802B (en) | 2020-04-16 | 2020-04-16 | Method and system for determining redundancy number of relay protection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111668802A true CN111668802A (en) | 2020-09-15 |
| CN111668802B CN111668802B (en) | 2022-09-09 |
Family
ID=72382663
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010299703.4A Active CN111668802B (en) | 2020-04-16 | 2020-04-16 | Method and system for determining redundancy number of relay protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111668802B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113011046A (en) * | 2021-04-19 | 2021-06-22 | 华北电力大学 | Method for determining redundant structure of relay protection core component |
| CN113076711A (en) * | 2021-03-09 | 2021-07-06 | 中国电力科学研究院有限公司 | Relay protection platform hardware design method and system based on component reliability |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102945316A (en) * | 2012-10-25 | 2013-02-27 | 华北电力大学 | Failure rate calculation method for relay protection device in consideration of covariates |
| US20150100839A1 (en) * | 2013-10-07 | 2015-04-09 | King Fahd University Of Petroleum And Minerals | Generalized modular redundancy fault tolerance method for combinational circuits |
| CN104616212A (en) * | 2015-02-06 | 2015-05-13 | 广东电网有限责任公司电力调度控制中心 | Relay protection system reliability analysis method and system |
| CN110531608A (en) * | 2019-07-29 | 2019-12-03 | 华东计算技术研究所（中国电子科技集团公司第三十二研究所） | High-reliability electronic equipment quantitative FMECA analysis method and system based on redundancy design |
-
2020
- 2020-04-16 CN CN202010299703.4A patent/CN111668802B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102945316A (en) * | 2012-10-25 | 2013-02-27 | 华北电力大学 | Failure rate calculation method for relay protection device in consideration of covariates |
| US20150100839A1 (en) * | 2013-10-07 | 2015-04-09 | King Fahd University Of Petroleum And Minerals | Generalized modular redundancy fault tolerance method for combinational circuits |
| CN104616212A (en) * | 2015-02-06 | 2015-05-13 | 广东电网有限责任公司电力调度控制中心 | Relay protection system reliability analysis method and system |
| CN110531608A (en) * | 2019-07-29 | 2019-12-03 | 华东计算技术研究所（中国电子科技集团公司第三十二研究所） | High-reliability electronic equipment quantitative FMECA analysis method and system based on redundancy design |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113076711A (en) * | 2021-03-09 | 2021-07-06 | 中国电力科学研究院有限公司 | Relay protection platform hardware design method and system based on component reliability |
| CN113076711B (en) * | 2021-03-09 | 2024-03-12 | 中国电力科学研究院有限公司 | Relay protection platform hardware design method and system based on component reliability |
| CN113011046A (en) * | 2021-04-19 | 2021-06-22 | 华北电力大学 | Method for determining redundant structure of relay protection core component |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111668802B (en) | 2022-09-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111668802B (en) | Method and system for determining redundancy number of relay protection device | |
| Shrestha et al. | Efficiency and reliability analyses of AC and 380 V DC distribution in data centers | |
| CN113489033A (en) | Toughness improvement-oriented energy storage control method and system for distributed power supply of power distribution network | |
| US11108068B2 (en) | Fuel cell control system | |
| CN112231126A (en) | Method for determining redundancy structure of core component of domestic relay protection | |
| CN106410789B (en) | A kind of power system blackstart partition method for isolated network | |
| Billinton et al. | Quantitative evaluation of permanent outages in distribution systems | |
| CN109828449A (en) | A kind of triplication redundancy control calculating voting system and method | |
| Ritchie et al. | Design of fuel cell powered data centers for sufficient reliability and availability | |
| CN112152184A (en) | Method for determining redundancy quantity of components of relay protection device | |
| WO2003100608A3 (en) | System and method with environment memory for input/output configuration | |
| CN111966054B (en) | Large-scale interlocking protection method and device for chemical plant | |
| WO2014024731A1 (en) | Linkage system switching device and power control system | |
| CN107292532B (en) | Power supply reliability assessment method for one-supply one-standby power distribution network in five-state space | |
| CN110531608A (en) | High-reliability electronic equipment quantitative FMECA analysis method and system based on redundancy design | |
| CN202817874U (en) | Uninterruptible power supply (UPS) redundant system | |
| CN110854826B (en) | Fault diagnosis and processing method for two-out-of-three protection system of flexible direct converter valve | |
| CN107832920A (en) | Marine wind electric field cluster Transmission Network Reliability appraisal procedure and system | |
| CN114825510A (en) | Redundant energy storage system and dynamic redundancy control method | |
| CN102902603B (en) | Data parallel computing-oriented fault-tolerant method | |
| Huffman et al. | Availability analysis of a solar power system with graceful degradation | |
| CN102981470B (en) | A kind of distributed system can repair control method | |
| CN110752597A (en) | Minimum load shedding strategy of electricity-gas coupling comprehensive energy system | |
| CN111146798A (en) | Reliability modeling method for multi-terminal direct-current power transmission system | |
| CN102185524A (en) | Reliable photovoltaic power system employing smart virtual low voltage photovoltaic modules |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |