CN107862460B - The distribution network reliability parser containing distributed generation resource based on fault-free route - Google Patents
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Abstract
The distribution network reliability parser containing distributed generation resource based on fault-free route that the invention discloses a kind of.It proposes the equivalent series and parallel structure of distributed power distribution network based on fault-free route, distributed power distribution network is subjected to equivalent process and obtains series and parallel structure；Then the reliability that distribution network system operation at least needs the reliability an of distributed generation resource and distribution network system operation at least to need more distributed generation resources is calculated separately.The present invention will accurately calculate the reliability of entire power distribution network, reduce and calculate the time.
Description
Technical field
The invention belongs to the distribution network reliability calculating fields containing distributed generation resource, have been specifically related to a kind of fault-free
The distribution network reliability parser containing distributed generation resource of route.
Background technique
Reliability engineering is grown up first from aerospace industry and electronics industry after World War II, at present
Aerospace, electronics, chemical industry, many industrial departments such as machinery are penetrated into.Reliability engineering penetrates into power industry and electrical equipment
Manufacturing industry starts from middle 1960s, and what is developed later is very fast.The function of electric system as far as possible may be used to user
Qualified electric energy is economically provided by ground, its reliability may be defined as providing a user up-to-standard, the energy of continuous electric energy
Power, this ability are usually indicated with probability.It is so-called up-to-standard, just refer to that the frequency of electric energy and voltage preferably must be held in regulation model
Within enclosing.
Current fail-safe analysis algorithm focuses primarily upon the Power System Reliability Analysis containing centralized power, still
With the introducing of distributed generation resource electricity, original Power System Reliability Analysis containing centralized power be not suitable for containing
The Power System Reliability Analysis of distributed generation resource can be used for counting so needing to propose a kind of new fail-safe analysis algorithm
Calculate the reliability of the power distribution network containing distributed generation resource.
Existing some algorithm can be used for calculating the reliability of the power distribution network containing distributed generation resource, but this kind of algorithm is all
It is the extention for distributed generation resource being regarded as system, the institute that there is no overall thinking distributed generation resources in power distribution network
The variation of bring reliability.So the present invention proposes that a kind of distributed power distribution network containing fault-free route is equivalent series-parallel
Structure, to comprehensively consider the reliability of power distribution network.
It is compared with the reliability of distributed generation resource, the failure rate of route can be ignored, it is contemplated that being based on fault-free route
The power distribution network containing distributed generation resource.
The shortcomings that prior art, is summarized as follows:
Prior art disadvantage 1: the algorithm that convectional reliability calculates is mainly used in is containing centralized distributed generation resource
It is less in the distribution network reliability parser containing distributed generation resource in system.(centralized distributed generation resource belongs to distributed electrical
Position is fixed in source, and concentrates on the Generation Side of system, and access transmission system is powered for user.Distributed generation resource is not direct
The distributed generation resource being connected with the transmission system of concentration, and it is dispersed in the user side of entire electric system, so as to right at any time
Power grid carries out electric energy supplement.It is concentrated mainly at power distribution network.Power distribution network refers to the network that distribution electric energy is played in power network, under
Level-one electric power networks are exactly user side.)
Prior art disadvantage 2: the present power distribution network containing distributed generation resource is separately to examine distributed generation resource and route
Consider, using distributed generation resource as the extention of entire distribution system, by distributed generation resource and the distribution for being free of distributed generation resource
Net is decontroled and is considered as two parts, does not on the whole come distributed generation resource and the reliable of original power distribution network as a whole
It accounts for.
Summary of the invention
In view of the deficiencies of the prior art, the invention proposes a kind of power distribution networks containing distributed generation resource of fault-free route can
By property parser, the equivalent series and parallel structure of the distributed power distribution network containing fault-free route is first proposed, simplify power distribution network
Fail-safe analysis process, then from system be that minimum distributed generation resource quantity required for maintaining operation carries out Calculation of Reliability.
The technical solution adopted by the invention is as follows:
The present invention proposes the equivalent series and parallel structure of distributed power distribution network based on fault-free route, by distributed generation resource
Power distribution network carries out equivalent process and obtains series and parallel structure；Then it calculates separately distribution network system operation and at least needs a distribution
Reliability and the distribution network system operation of power supply at least need the reliability of m platform distributed generation resource, m ≠ 1.
It is described that distributed power distribution network is subjected to equivalent process acquisition series and parallel structure, specifically:
Firstly, the distribution network line is equivalent at mainly by major component and add ons by constituting in series and parallel, pivot
Part includes a foundation distributing power supply and a series of base components, and a series of base components are connected in series to foundation distributing
The same end of power supply；Add ons are additional distributed generation resource, and adding distributed generation resource is to be parallel to foundation distributing power supply
Or in base components.
Foundation distributing power supply of the invention and additional distributed generation resource are referred to as distributed generation resource.
As shown in Fig. 2, L1~LnIndicate n major component, L1Indicate foundation distributing power supply, L2~LnIndicate distribution network line
On base components, base components are the transmission line of electricity that original power distribution network carries or the elements such as transformer, and G indicates additional distribution
Formula power supply.
The reliability for calculating distribution network system operation and at least needing a distributed generation resource, specifically uses following formula
It calculates:
If the case where power distribution network operation at least needs a distributed generation resource, which can not work normally is exactly every
One power generation all can not work normally or the power of power supply can not transmit, so in this case, being based on fault-free route
The reliability containing the equivalent series and parallel structure of distributed power distribution network:
In formula, Rref1Indicate make series-parallel minor structure it is equivalent after distribution network system reliability, i indicate distributed generation resource
Serial number, i be less than or equal to n, n indicate major component quantity, N indicate distributed generation resource sum, piIndicate point of serial number i
The probability that cloth power supply works normally.
The present invention is the series and parallel structure containing fault-free route due to consideration, so not considering line in Calculation of Reliability
The state probability values on road.
The reliability for calculating distribution network system operation and at least needing m platform distributed generation resource, m ≠ 1 are specific as follows:
1) first to be carried out under each series-parallel minor structure normal work of processing acquisition in the following way, the event of distribution network system
Barrier rate；
System operation at least needs m platform distributed generation resource, i.e., when only 2,3 ..., m-1 platform distributed generation resource works, is
System is in malfunction, such situation needs Taxonomic discussion.
1. if all distributed generation resources all failures, the failure rate of distribution network system are as follows:
Wherein, Q1 indicates the reliability of distribution network system, and i indicates the serial number of distributed generation resource, and i is less than or equal to n, and N is indicated
The sum of distributed generation resource, piIndicate the probability that the distributed generation resource of serial number i works normally；
2. f is less than or equal to m if having and only f-1 platform distributed generation resource is normal, the equal failure of remaining distributed generation resource is then matched
The failure rate of network system are as follows:
In formula, a, s, i, j indicate distributed generation resource serial number；
2) the m platform distributed generation resource required for 1) operating normally for distribution network system that repeats the above steps is in each
The case where when series-parallel minor structure, is calculated separately, and the reliable of distribution network system normal operation is then calculated using the following equation
Property:
Rref2=1-Q1-Q2-......-Qm
Wherein, Qm indicates the probability of m-1 platform distributed generation resource normal work, remaining distributed generation resource failure, Q2 table
It is shown with the probability of 1 distributed generation resource normal work, remaining distributed generation resource failure, Q1 indicates all equal failures of distributed generation resource
Probability, Rref2Indicate the reliability of distribution network system under the premise of at least needing m platform distributed generation resource to work normally.
The present invention proposes the series and parallel structure containing distributed generation resource, by every route distributed generation resource in parallel and phase
The line equivalent answered is an entirety, and the reliability of entire power distribution network is calculated by each small whole reliability.Pass through master
The relationship of the order of connection and series and parallel between element and add ons comes the company in equivalent real system between each element
Connect relationship.
The present invention is based on the series and parallel structures containing distributed generation resource of proposition, do not consider line failure rate, protect from system
Minimum distributed generation resource number required for operation is held to carry out the measurement of distribution network reliability, from least needing a stylobate plinth to be distributed
Formula power supply proposes to can be used for measuring that containing based on fault-free route divides with m platform is at least needed in terms of adding distributed generation resource two
The reliability of the equivalent series and parallel structure of cloth electrical power distribution net.
The present invention is since the failure rate of transmission line of electricity is smaller, so ignoring the failure rate of route, it is believed that entire power distribution network
Failure of the failure from distributed generation resource.
The beneficial effects of the present invention are:
The present invention comprehensively considers distributed generation resource into distribution network system, proposes the distribution network system containing distributed generation resource
Equivalent series and parallel structure simplifies the structure of the power distribution network containing distributed generation resource, and it is public to simplify related reliability probability calculation
Formula is more advantageous to the understanding and calculating of mathematical formulae.
The present invention will accurately calculate the reliability of entire power distribution network, reduce and calculate the time.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Fig. 2 is the series-parallel minor structure structure division figure after the present invention is equivalent.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
The embodiment of the present invention is as follows:
Step 1: proposing the equivalent series and parallel structure of the distributed power distribution network containing fault-free route.
As shown in Fig. 2, L1~LnIndicate n major component, L1Indicate foundation distributing power supply, L2~LnIndicate distribution network line
On base components, base components are the transmission line of electricity that original power distribution network carries or the elements such as transformer, and G indicates additional distribution
Formula power supply.
Step 2: the system operation of proposition at least needs the Calculation of Reliability formula an of distributed generation resource.
Assuming that every distributed electrical source dates are consistent, normal working probability 0.98, so system worked well volume probability
Are as follows:
Step 3: the system operation of proposition at least needs the Calculation of Reliability formula of m platform distributed generation resource.
Assuming that at least 3 distributed generation resources work normally, then system worked well, i.e. m=3.
Rref2=1-Q1-Q2-......-Qm
=1-Q1-Q2-Q3
Q1=4.096*10-21
Q2=1.103872*10-16
Q3=5.4089728*10-14
R=1-5.42001193*10-14
The present embodiment result of implementation and conventional method (markoff process) calculate the comparison of time, are as follows:
1 time of table compares, and at least m platform is changed to distributed generation resource normal work
It can be seen that this upper algorithm of time is faster, it is more suitable for the Calculation of Reliability of large scale system.
The present embodiment result of implementation and conventional method (markoff process) carry out the comparison of computational accuracy, are as follows:
2 computational accuracy of table compares, and at least m platform distributed generation resource works normally
| This method | Conventional method (markoff process) | |
| Computational accuracy | R=1-5.42001193*10-14 | R=1-6.0000452*10-14 |
It can be seen that the calculated result of this method is similar to traditional calculated result of markoff process, this method has
Higher accuracy in computation.
Claims (3)
1. a kind of distribution network reliability evaluation method containing distributed generation resource based on fault-free route, it is characterised in that: propose
The equivalent series and parallel structure of distributed power distribution network based on fault-free route, carries out equivalent process for distributed power distribution network
Obtain series and parallel structure；Then reliability and distribution that distribution network system operation at least needs a distributed generation resource are calculated separately
Net system runs the reliability at least needing m platform distributed generation resource, m ≠ 1；
The reliability for calculating distribution network system operation and at least needing m platform distributed generation resource, m ≠ 1 are specific as follows:
1) first to be carried out under each series-parallel minor structure normal work of processing acquisition in the following way, the failure of distribution network system
Rate；
1. if all distributed generation resources all failures, the failure rate of distribution network system are as follows:
Wherein, Q1 indicates the reliability of distribution network system, and i indicates the serial number of distributed generation resource, and i is less than or equal to N, and N indicates distribution
The sum of formula power supply, piIndicate the probability that the distributed generation resource of serial number i works normally；
2. f is less than or equal to m, the equal failure of remaining distributed generation resource, then power distribution network if having and only f-1 platform distributed generation resource is normal
The failure rate of system are as follows:
In formula, a, s, i, j indicate distributed generation resource serial number；
2) the m platform distributed generation resource required for 1) operating normally for distribution network system that repeats the above steps is in each string simultaneously
The case where when joining minor structure, is calculated separately, and the reliability of distribution network system normal operation is then calculated using the following equation:
Rref2=1-Q1-Q2-......-Qm
Wherein, Qm indicates that the probability of m-1 platform distributed generation resource normal work, remaining distributed generation resource failure, Q2 indicate 1
The probability of distributed generation resource normal work, remaining distributed generation resource failure, Q1 indicate the probability of the equal failure of all distributed generation resources,
Rref2Indicate the reliability of distribution network system under the premise of at least needing m platform distributed generation resource to work normally.
2. a kind of evaluating reliability of distribution network side containing distributed generation resource based on fault-free route according to claim 1
Method, it is characterised in that: it is described that distributed power distribution network is subjected to equivalent process acquisition series and parallel structure, specifically:
Firstly, the distribution network system is equivalent at mainly by major component and add ons by constituting in series and parallel, major component packet
A foundation distributing power supply and a series of base components are included, a series of base components are connected in series to foundation distributing power supply
The same end；Add ons are additional distributed generation resource, additional distributed generation resource be be parallel to foundation distributing power supply or
In base components.
3. a kind of evaluating reliability of distribution network side containing distributed generation resource based on fault-free route according to claim 1
Method, it is characterised in that: it is described to calculate distribution network system operation and at least need the reliability of a distributed generation resource, specifically use with
Lower formula calculates:
In formula, Rref1 indicate to make series-parallel minor structure it is equivalent after distribution network system reliability, i indicates distributed generation resource
Serial number, i are less than or equal to N, and N indicates the sum of distributed generation resource, piIt is general to indicate that the distributed generation resource of serial number i works normally
Rate.
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