CN103197172A - Direct current protection system reliability assessment method in 'two from three' mode - Google Patents
Direct current protection system reliability assessment method in 'two from three' mode Download PDFInfo
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- CN103197172A CN103197172A CN2013100697815A CN201310069781A CN103197172A CN 103197172 A CN103197172 A CN 103197172A CN 2013100697815 A CN2013100697815 A CN 2013100697815A CN 201310069781 A CN201310069781 A CN 201310069781A CN 103197172 A CN103197172 A CN 103197172A
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Abstract
The invention belongs to the technical field of electric power system protection, and discloses a direct current protection system reliability assessment model and a direct current protection system reliability assessment method. Primary equipment and protection states are defined through combination of the primary equipment and consideration of protection self-checking conditions at the same time; a state transition relation between different states is determined based on the Markov state space theory and according to a 'two from three' configuration scheme of an actual direct current relaying protection system; a state transition matrix of the system is obtained through a state space diagram, the stable state probability of the system in each state is obtained through deduction, and the unavailability of the system is the sum of residence probabilities of unavailable states which are protected; and therefore the unavailability of the protection system is obtained. The direct current protection system reliability assessment model and the direct current protection system reliability assessment method solve the problem that in an existing relaying protection equipment reliability assessment process, due to differences between redundancy configuration schemes of an alternating current and direct current protection system, an existing method cannot be used for realizing direct current protection system reliability assessment in a 'two from three' mode. Due to the fact that the primary equipment and the protection self-checking function are considered at the same time, the direct current protection system reliability assessment model can be more accurate, and the direct current protection system reliability assessment method is more effective.
Description
Technical field
The present invention relates to a kind of direct current protecting Reliability evaluation model and appraisal procedure, belong to the protecting electrical power system technical field.
Background technology
The reliability of electric system is except the performance that depends on primary equipment and system architecture stable, and is also closely related with secondary control protection system.The defencive function of DC transmission system is as the reserve of control function, and its reliability has material impact to the stable operation of national interconnected network.The control protection system must be guaranteed the high reliability of self, therefore needs to adopt redundant configuration." three get two " redundant fashion is a kind of allocation plan of direct current protecting system commonly used, but this allocation plan commonly used with exchanging protection system is different, thereby corresponding reliability estimation method also can be variant.
At present, the research of reliability of relay protection is primarily aimed at the interchange relay protection system.Relay protection system is recoverable system, and such system can describe with Markov process, thereby the Markov state-space method is usually used in the reliability modeling of relay protection system.Write the residing state of relay protection system by row: normal operation, fault, maintenance etc., set up state space, obtain the reliability assessment model.Existing research more is the reliability of paying close attention to protective relaying device, is set to research object with single suit, seldom can realize the reliability assessment of whole relay protection system from system-level angle.
In fact, the direct current protecting system adopts " three get two " redundant configuration, and the defencive function of 3 cover direct current protectings is identical, and at least two systems start the protection tripping operation, and the trip signal of direct current protecting system could finally be carried out.Can not directly reflect the reliability of total system at the assessment result of single covering device, so need the consideration redundant configuration to set up the reliability assessment model of total system level.Simultaneously, though existing high pressure reliability of relay protection assessment models is considered the redundancy of protection, its at be dualization configuration.The present invention has considered the self-checking function of protection system, simulating actual conditions better simultaneously.
Summary of the invention
The present invention is directed in the reliability assessment model of existing relay protection system; only single cover protection is research object or the dualization configuration of having considered protection; and other redundant configuration schemes of reliability are not protected in consideration, thereby can't realize the reliability assessment of direct current protecting system under " three get two " mode.The present invention considers the configuration of " three get two " system redundancy from system-level angle, considers the protection self-checking function simultaneously, has set up the effectively reliability model of analog DC protection system state transitions situation, has provided corresponding appraisal procedure.
A kind of " three get two " mode direct current protecting system reliability estimation method, this appraisal procedure key step comprises:
1) considers primary equipment and direct current protecting self-checking function, definition primary equipment and direct current protecting state;
2) determine that the state transitions between the different conditions concerns, set up " three get two " mode direct current protecting Markov of system state space;
3) according to Markov state space computing system degree of unavailability.
The primary equipment of described definition and direct current protecting state, concrete UP represents to be in running status, DN represents to be in shut down condition, ISO represents to be in the segregate state of primary equipment, REP represents service mode once or after the secondary device fault, NS represent to once or secondary device carry out inspecting state;
The computing method of described system degree of unavailability are according to the Markov state space, and state-transition matrix that must this system is derived and obtained system at the plateau probability of each state, and system's degree of unavailability is the resident probability sum that refers to the protection down state.
The invention solves in the existing relay protection device reliability assessment, because the difference of the redundant configuration scheme of alternating current-direct current protection system, existing method can not realize the problem of direct current protecting Reliability evaluation under " three get two " mode.The present invention considers primary equipment and protection self-checking function simultaneously, makes assessment models more accurate, and appraisal procedure is more effective.
Description of drawings
Fig. 1 is direct current protecting system reliability estimation method process flow diagram.
Fig. 2 is the state-space model figure of direct current protecting system under " three get two " mode.
Embodiment
Below in conjunction with drawings and Examples the present invention is elaborated.Should be emphasized that following explanation only is exemplary, rather than in order to limit the scope of the invention and to use.
Fig. 1 is direct current protecting system reliability estimation method process flow diagram.Among Fig. 1, based on the state space theory theory, consider " three get two " allocation plan and primary equipment and protection self-checking function, the process of calculating direct current protecting system degree of unavailability comprises:
A kind of " three get two " mode direct current protecting system reliability estimation method, this method step is as follows:
Step 1: consider primary equipment and direct current protecting self-checking function, definition primary equipment and direct current protecting state.
Symbol description in the state space:
1) C represents protected primary equipment;
2) P1, P2, P3 represent protection system 1, protection system 2, protection system 3 respectively;
3) UP represents to be in running status;
4) DN represents to be in shut down condition;
5) ISO represents to be in the segregate state of primary equipment;
6) REP represents service mode once or after the secondary device fault;
7) NS represent to once or secondary device carry out inspecting state;
The assumed condition of setting up state space comprises:
1) plant failure rate and maintenance rate all are constant;
2) must be out of service during turnaround of unit;
3) can find the device all defect after the turnaround of unit, and it is repaired intact state;
4) do not consider the situation (P1, P2, P3 break down always to be had successively) that protection system P1, P2, P3 and object of protection C break down simultaneously;
5) maintenance of protection P1, P2, P3 is separate, simultaneously two cover protections is not overhauled;
6) do not consider the influence of human error.
Step 2: determine the state transitions relation between the different conditions, set up " three get two " mode direct current protecting Markov of system state space.
Parameter declaration in the state space:
1) Fp, Rr represent failure rate, the maintenance efficiency of protective relaying device respectively
2) failure rate, the maintenance efficiency of Fc, Rc difference object of protection
3) ST represents the self check coefficient of efficiency of protective relaying device
4) represent can be by the protective device fault of self check, Fst=Fp*ST for Fst
5) Fpp represents not by the protective device fault of self check, Fpp=Fp*(1-ST)
6) Fcc represents the failure rate that object of protection and protective device break down simultaneously
7) Rt represents the overhaul efficiency (inspection and repair shop take time inverse) of protective relaying device
8) Sn represents main protection fault trip resection rate
9) Sb represents back-up protection fault trip resection rate
10) IRpm represents protective device maintenance rate (time between overhauls(TBO) inverse)
As Fig. 2, state 1 expression object of protection C, protective device P1, P2, P3 are in the situation of normal operating condition.State 2,3,4 expression object of protection C are in normal operating condition, and the cover in the three cover protections is because the situation of a variety of causes cisco unity malfunction.State 9,10,11 expression object of protection C are in normal operating condition, and two covers in the three cover protections are because the situation of a variety of causes cisco unity malfunction.State 14 expression object of protection C are in normal operating condition, and three cover protections are because a variety of causes situation of cisco unity malfunction all. State 5,6 expression object of protection C break down, the situation that three cover protections can both operate as normal.State 7,8 expression object of protection C break down, and the cover in the three cover protections is because the situation of a variety of causes cisco unity malfunction.State 12,13 expression object of protection C break down, and two covers in the three cover protections are because the situation of a variety of causes cisco unity malfunction.State 15,16 expression object of protection C break down, and three cover protections are because a variety of causes situation of cisco unity malfunction all.
Step 3: according to Markov state space computing system degree of unavailability.
To the evaluation of protection system reliability, adopt the degree of unavailability index expression.In fact direct current protecting system degree of unavailability refers to protect disabled probability, is state shown in the figure 9,10,11,12,13,14,15,16 probability sum.
Utilize the state-space model of Fig. 2, can obtain state-transition matrix A, wherein
a
11=1-(F
c+F
ST+F
pp+IR
pm)
a
22=1-(R
t+F
c+F
cc)
a
33=1-(F
c+F
cc+F
ST+F
pp+IR
pm)
a
44=1-(R
r+F
c+F
cc)
a
55=1-S
n
a
66=1-R
c
a
77=1-S
n
a
88=1-R
c
a
99=1-(F
c+F
cc+F
pp+R
t)
a'
11=1-(F
c+F
cc+F
pp)
a'
12=1-S
b
a'
13=1-0.5R
r
a'
14=1-F
c
a'
15=1-S
b
a'
16=1-1/3S
r
P
T=[P
1?P
2?...?P
i?...?P
16]
P is the resident probability column vector of state in the model, p
i(i=1,2 ... 16) be the resident probability of state i in the model.Ι is unit matrix, then has
Obtain the resident probability of each state by solving an equation, thereby obtain the degree of unavailability of direct current protecting " three get two " system
RelUn=P
9+P
10+P
11+P
12+P
13+P
14+P
15+P
16
The present invention considers the special configurations scheme of direct current protecting system, meets direct current relay protection system practical operation situation.Consider self check simultaneously, make that the state space of protection system is further perfect.Assessment models is more accurate, and appraisal procedure is more effective.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.
Claims (4)
1. " three get two " mode direct current protecting system reliability estimation method is characterized in that described method comprises the following steps:
Step 1: consider primary equipment and direct current protecting self-checking function, definition primary equipment and direct current protecting state;
Step 2: determine the state transitions relation between the different conditions, set up " three get two " mode direct current protecting Markov of system state space;
Step 3: according to Markov state space computing system degree of unavailability.
2. a kind of " three get two " according to claim 1 mode direct current protecting system reliability estimation method is characterized in that, made the following assumptions earlier before described appraisal procedure: (1) plant failure rate and maintenance rate all are constant; (2) must be out of service during turnaround of unit; (3) can find the device all defect after the turnaround of unit, and it is repaired intact state; (4) do not consider the situation (P1, P2, P3 break down always to be had successively) that protection system P1, P2, P3 and object of protection C break down simultaneously; (5) maintenance of protection P1, P2, P3 is separate, simultaneously two cover protections is not overhauled; (6) do not consider the influence of human error.
3. a kind of " three get two " according to claim 1 mode direct current protecting system reliability estimation method; it is characterized in that; the primary equipment of described definition and direct current protecting state are: UP represents to be in running status; DN represents to be in shut down condition; ISO represents to be in the segregate state of primary equipment; REP represents service mode once or after the secondary device fault, NS represent to once or secondary device carry out inspecting state.
4. a kind of " three get two " according to claim 1 mode direct current protecting system reliability estimation method; it is characterized in that; described system degree of unavailability computing method are: according to the Markov state space; state-transition matrix that must this system; derivation obtains system at the plateau probability of each state, and system's degree of unavailability is the resident probability sum that refers to the protection down state.
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Cited By (4)
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CN104408312A (en) * | 2014-11-27 | 2015-03-11 | 北京广利核***工程有限公司 | Method for computing maloperation rate of nuclear power station system |
CN106527398A (en) * | 2016-11-14 | 2017-03-22 | 辽宁工程技术大学 | Element maintenance rate distribution determining method in different electric element forming systems |
CN106684840A (en) * | 2017-01-20 | 2017-05-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Exit method under unavailable condition of DC protection in DC pole control systems |
CN113011046A (en) * | 2021-04-19 | 2021-06-22 | 华北电力大学 | Method for determining redundant structure of relay protection core component |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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CN104408312A (en) * | 2014-11-27 | 2015-03-11 | 北京广利核***工程有限公司 | Method for computing maloperation rate of nuclear power station system |
CN104408312B (en) * | 2014-11-27 | 2017-12-05 | 北京广利核***工程有限公司 | A kind of nuclear power plant system malfunction rate computational methods |
CN106527398A (en) * | 2016-11-14 | 2017-03-22 | 辽宁工程技术大学 | Element maintenance rate distribution determining method in different electric element forming systems |
CN106527398B (en) * | 2016-11-14 | 2019-07-12 | 辽宁工程技术大学 | Component maintenance rate distribution determination method in a kind of difference electrical component composition system |
CN106684840A (en) * | 2017-01-20 | 2017-05-17 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Exit method under unavailable condition of DC protection in DC pole control systems |
CN113011046A (en) * | 2021-04-19 | 2021-06-22 | 华北电力大学 | Method for determining redundant structure of relay protection core component |
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Application publication date: 20130710 |