CN108565858A - Mixing alternating current-direct current distribution network reliability evaluation method containing flexible substation - Google Patents
Mixing alternating current-direct current distribution network reliability evaluation method containing flexible substation Download PDFInfo
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- CN108565858A CN108565858A CN201810466643.3A CN201810466643A CN108565858A CN 108565858 A CN108565858 A CN 108565858A CN 201810466643 A CN201810466643 A CN 201810466643A CN 108565858 A CN108565858 A CN 108565858A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
- G06F30/398—Design verification or optimisation, e.g. using design rule check [DRC], layout versus schematics [LVS] or finite element methods [FEM]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
An embodiment of the present invention provides a kind of meter and the mixing alternating current-direct current distribution network reliability evaluation methods of flexible substation.This method includes：The network topology and component reliability parameter value for obtaining power distribution network, determine the dependability parameter of distributed generation resource DG；According to the network topology of power distribution network, electric power electric transformer reliability model is built；It can individually meet workload demand according to distributed generation resource DG, establish the corresponding more power failure trees of load or single supply fault tree；According to minimal cut set theory, using more power failure trees or single supply fault tree, the reliability index of each load in power distribution network is calculated separately out；According to the reliability index of each load in power distribution network, the reliability index of power distribution network is calculated.The present invention solves the problems, such as not yet commercialized running electric power electric transformer equipment application evaluating reliability of distribution network in the case of flexible substation, and technical support is provided for the feasibility study and planning and designing of flexible substation project.
Description
Technical field
The present invention relates to distribution network technology fields more particularly to a kind of mixing alternating current-direct current power distribution network containing flexible substation can
By property appraisal procedure.
Background technology
With the maturation of energy exploitation and application technology, the proportion of the clean energy resourcies such as mains side wind-powered electricity generation, photovoltaic is in power supply architecture
In ratio gradually increase.At the same time, the load type of electricity consumption side, power mode are also changed, such as computer, data
The DC loads quantity such as center is increasing, and occurs being formed by charge and discharge with the ev industry that green traffic drives two-way
Load.It is fluctuated to cope with the unstable caused generated output of the natural resources such as scene, and reduces DC load to alternating current
Harmonic wave caused by net, power grid need to install energy storage device, filter, reactive power compensator etc. additional.Thus the problem of bringing be：
Alternating current-direct current change of current conversion equipment increases in power grid, includes DC/AC the or AC/DC converting means of different voltages grade, along with electricity
Newly-increased such as DG (distributed generation, distributed generation resource), the new equipments such as energy storage, these equipment also have in net
There is respective output characteristics, distribution network structure is caused to become increasingly complex, it is more difficult to coordinate control.It is asked to cope with this
Electric power electric transformer is applied to become by topic by means of increasingly ripe power electronic technique and its flexible equipment manufacturing technology
It is many one of schemes for solving the above challenge in power station.
The integrated equipment that electric power electric transformer is made of modular current transformer and high frequency transformer has power tune
The multiple functions such as flexible and AC-DC conversion are saved, it is double can not only easily to access distributed energy, accumulator of electric car etc.
To load, energy storage device, moreover it is possible to easily regulate and control the various advantages energy such as the method for operation of power distribution network so that the structure of power distribution network
Simplified, control flexibly, is convenient for hierarchical control, substitutes conventional electric power transformer in substation to become and collects transformation and flexibility control
The novel device of system so that substation no longer can only transformation and distribution electric energy, moreover it is possible in control station, stand outside electrical ginseng
Number, including voltage, electric current, power etc., to will before Improvement of Conventional Transformer Substation at meeting current power grid control and management needs
Flexible substation, to greatly change the configuration of original power distribution network.In this case, for containing flexible substation
Mixing alternating current-direct current distribution network reliability analysis becomes particularly significant, it can help electrical management, and person understands that influence changes
The weak module of distribution network reliability ensure distribution netting gear to reinforce the research of the relevant technologies and the refinement of management work
There are higher design and operation level.
And when carrying out the distribution network reliability analysis containing flexible substation, problem is encountered that, in flexible substation station
Key equipment electric power electric transformer not yet enters commercialized running, lacks reliability operation parameter, and previous power distribution network is reliable
Property analysis be mostly based on all running equipments of power distribution network statistical parameter calculate, be to provide service for the operational management of power distribution network
's.How fail-safe analysis is carried out for the power distribution network for the electric power electric transformer equipment that still puts into operation, there is not yet and report.In the past such as
The fail-safe analysis of the flexible electrics equipment such as direct-current transmission converter equipment, using based on component-level reliability theory model into
Row analysis calculates, and excessively idealizes；In addition, the voltage class of flexible electric equipment is high, at least 10kV or more, topology is complicated,
There are thousands of a IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar triode) up to a hundred in the inside, and
The calculated equipment dependability of component-level reliability theory model based on substantial amounts, easy tos produce larger error, with work
Journey physical presence larger distance.
In view of this novel electric power apparatus of electric power electric transformer puts into power grid, in project feasibility study or planning and designing
The needs of reliability assessment, it is necessary to design a set of mixing alternating current-direct current power distribution network disclosure satisfy that requirement of engineering, facilitating calculating
The method for carrying out reliability assessment is handled in flexible substation containing the electric power electric transformer equipment such case that not yet puts into operation.
Invention content
The embodiment provides a kind of meter and the mixing alternating current-direct current evaluating reliability of distribution network sides of flexible substation
Method, to solve the problems in above-mentioned background technology.
To achieve the goals above, this invention takes following technical solutions：
A kind of reliability assessment side for mixing alternating current-direct current power distribution network containing flexible substation that the embodiment of the present invention provides
Method, which is characterized in that this method includes：
Obtain the network topology and component reliability parameter value of power distribution network；
Determine the dependability parameter of distributed generation resource DG；
According to the network topology of the power distribution network, electric power electric transformer reliability model is built；
Can individually meet workload demand according to the distributed generation resource DG, establish the corresponding more power failure trees of load or
Single supply fault tree；
According to minimal cut set theory, using more power failure trees or the single supply fault tree, calculates separately out and match
The reliability index of each load in power grid；
According to the reliability index of each load described in power distribution network, the reliability index of power distribution network is calculated.
Preferably, the network topology and component reliability parameter value of the acquisition power distribution network, including：
The network topology of the power distribution network includes：Flexible substation, high-voltage alternating network, HVDC network, low pressure
AC network and DC.low voltage network；
The high-voltage alternating network connects high-voltage ac power, and is connected by high-voltage alternating inlet wire and the flexible substation
It connects；
The HVDC network connects high-voltage DC power supply, and is connected by high voltage direct current inlet wire and the flexible substation
It connects；
The low-voltage alternating-current network is connect by low-voltage alternating-current outlet with the flexible substation, and it is negative to connect low-voltage alternating-current
It carries；
The DC.low voltage network is connect by low-voltage direct outlet with the flexible substation, and it is negative to connect low-voltage direct
It carries.
Preferably, the network topology and component reliability parameter value of the described acquisition power distribution network further include：
The element refers to the element containing flexible substation's power distribution network, including：Electric power electric transformer, breaker, isolation
Switch, busbar, distribution line and power transformer, the element in flexible substation include but not limited to：Electric power electric transformer,
Breaker, disconnecting switch and busbar；
Wherein, the distribution line is overhead line or cable；
The breaker includes：Dc circuit breaker and AC circuit breaker；
The electric power electric transformer includes：Main circuit and control circuit, the main circuit are based on inner topology and interface
Including 5 conversion modules：The AC/DC converters of the first order, the DC/AC converters of the second level, the high frequency transformer of the third level,
The AC/DC converters of level Four and the DC/AC converters of level V, wherein the AC/DC converters of the first order are by high-voltage alternating
The DC/AC converters output low-voltage AC of input of the electricity as the electric power electric transformer, the level V is negative for exchanging
It carries and uses；
The electric power electric transformer includes but not limited to：There are one DC port and an AC ports；
The busbar uses：Single busbar, sectionalized single busbar connection, bridge connection, double-bus or double-bus segmentation.
Preferably, the network topology and component reliability parameter value of the described acquisition power distribution network further include：
The flexibility substation and the high-voltage alternating network, HVDC network, low-voltage alternating-current network and low-voltage direct
The topological mode of network is：
The inlet wire of the flexibility substation：DC power supply in the HVDC network connects through the dc circuit breaker
Tap into line side busbar BUSHD, the BUSHDThe other side height of the electric power electric transformer is connected to through the dc circuit breaker
Press DC side；
AC power in the high-voltage alternating network connects inlet wire side bus through two AC circuit breakers respectively
BUSHA1、BUSHA2, the BUSHA1With the BUSHA2Pass through section switch SWBIt is connected, the BUSHA1Through the alternating current interruption
Device is connected to the high-voltage alternating side of the electric power electric transformer, the BUSHA2Electric power is connected to through the AC circuit breaker to become
The high-pressure side of depressor；
The outlet of the flexibility substation：Include DC load LOAD in the DC.low voltage networkD11And Bidirectional charging-discharging
Device LOADD12, the LOADD11With the LOADD12It is connected to successively through the dc circuit breaker and low-voltage direct busbar described
The low-voltage direct side of electric power electric transformer；
Sensitive AC load LOAD in the low-voltage alternating-current networkA1, successively through the AC circuit breaker and low-voltage alternating-current
Busbar is connected to the low-voltage alternating-current side of the electric power electric transformer；
Regular alternating current in the low-voltage alternating-current network loads LOADA2, successively through the AC circuit breaker and low-voltage alternating-current
Busbar is connected to the low-pressure side of power transformer.
Preferably, the network topology and component reliability parameter value of the described acquisition power distribution network further include：
The component reliability parameter value includes：Failure rate and repair time；
The electric power electric transformer, busbar, the failure rate of breaker and distribution line and repair time unite according to history
Count and check in, the electric power electric transformer, busbar, breaker and distribution line failure rate be respectively：PT、PBUS、PSW、
PLINE, the electric power electric transformer, busbar, breaker and distribution line repair time be respectively：RT、RBUS、RSW、RLINE。
Preferably, the dependability parameter of the determination distributed generation resource DG, including：
If the dependability parameter of the distributed generation resource DG is PDG；
The installed capacity of distributed generation resource DG is predefined, the failure rate for giving distributed generation resource is λDG, when fault restoration
Between be RDG, according to the history data of the distributed generation resource DG of location, if year hours of operation is TDG, obtain distribution
The output power of formula power supply DG, and be compared with load power, if the probability and failure of the output of distributed generation resource DG inactivitys
Rate is PDGi(i=1,2), then PDGFor：
8760=24 hours/day × 365 day/years, refer to 1 year hourage, unit hour (h)；
RDGFor the fault correction time of DG, it is the known parameters for calculating reliability, passes through the history data of DG
Statistics obtains；
Wherein, PDGiRefer to the result calculated according to formula (1), (2).
Preferably, the network topology according to the power distribution network builds electric power electric transformer reliability model, packet
It includes：
Transverter in the electric power electric transformer and high frequency transformer obtain reliability ginseng with reference to history data
Number；
According to the network topology of the power distribution network, the supply path of load point is determined, and then determine electric power electric transformer
The method of operation and each supply path described in electric power electric transformer the module to put into operation, the module is joined
With operation；
The module is 5 conversion modules of the electric power electric transformer PET, if the failure rate of each module is
Ppetj, the reliability P of the conversion module of the electric power electric transformerpetjFor known parameters, transported by the history of such conversion module
Line number obtains according to statistics, repair time Rpetj, for calculating fault time in year, wherein j=1 ... m, m≤5, m are described
Electric power electric transformer input number of modules, then the failure rate of the electric power electric transformer be：
Preferably, described that can workload demand be individually met according to distributed generation resource DG, it is corresponding mostly electric to establish load
Source fault tree or single supply fault tree, including：
Judge that can distributed generation resource DG individually meet workload demand, if the dependability parameter of distributed generation resource DG can be individually
Meet workload demand, then the corresponding more power failure trees of load is established, if the dependability parameter of distributed generation resource DG cannot be independent
Meet workload demand, then establishes the corresponding single supply fault tree of load；
This part thing of the system failure is defined as top event, the power that DG is sent out is greater than or equal to power distribution network internal loading demand
Occur the system failure when power and be denoted as top event A1, otherwise is top event A2.Analysis can or cannot individually meet negative respectively accordingly
Network topology under lotus conditions of demand and load point supply path are analyzed by top event according to fault tree theory to bottom thing layer by layer
Part is element fault, to each load point, establishes the corresponding failure tree graph F of loadTAk(k=1,2).
Preferably, described according to minimal cut set theory, using more power failure trees or the single supply fault tree,
The reliability index of each load in power distribution network is calculated separately out, including：
According to minimal cut set theory, A is obtained by failure tree graph1、A2Minimal cut set under two states：A11…A1m, A21…
A2n, wherein Ak={ Xk1,Xk2,…,XklIt is bottom event XklSet；
A certain load point is calculated in A according to formula (5), (6)1、A2Year failure rate P in the case of two kindsAkWhen having a power failure with year
Between TAk, the year failure rate P of the load point is then obtained according to formula (7) (8) weightingLOADD11With year power off time TLOADD11；
Wherein, α2=1- α1。
Preferably, the reliability index according to each load in power distribution network, calculates the reliability index of power distribution network,
Including：
The year failure rate P of S load point in power distribution network is calculated successivelyLOADtWith year power off time TLOADt, then power distribution network
Whole year failure rate be：
The whole year power off time of power distribution network is：
The embodiment of the present invention is by obtaining power distribution network it can be seen from the technical solution that embodiments of the invention described above provide
Network topology and component reliability parameter value, determine the dependability parameter of distributed generation resource DG；It is opened up according to the network of power distribution network
It flutters, builds electric power electric transformer reliability model；It can individually meet workload demand according to distributed generation resource DG, establish load
Corresponding more power failure trees or single supply fault tree；According to minimal cut set theory, more power failure trees or single supply event are utilized
Barrier tree, calculates separately out the reliability index of each load in power distribution network；According to the reliability index of each load in power distribution network, calculate
Go out the reliability index of power distribution network.The present invention is simple and easy to do, can meet requirement of engineering, can solve not yet commercialized running electric power electricity
Sub- transformer equipment is applied to evaluating reliability of distribution network problem in the case of flexible substation, for the feasibility study of flexible substation project
And planning and designing provide technical support.
The additional aspect of the present invention and advantage will be set forth in part in the description, these will become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill of field, without having to pay creative labor, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is a kind of mixing alternating current-direct current evaluating reliability of distribution network side containing flexible substation provided in an embodiment of the present invention
The process flow block diagram of method；
Fig. 2 is a kind of mixing alternating current-direct current power distribution network connection diagram containing flexible substation provided in an embodiment of the present invention；
Fig. 3 is a kind of electric power electric transformer main circuit structure signal of flexible substation provided in an embodiment of the present invention
Figure；
Fig. 4 is a kind of load point power supply of mixing alternating current-direct current power distribution network containing flexible substation provided in an embodiment of the present invention
Path profile.
Specific implementation mode
Embodiments of the present invention are described below in detail, the example of the embodiment is shown in the accompanying drawings, wherein from beginning
Same or similar element or element with the same or similar functions are indicated to same or similar label eventually.Below by ginseng
The embodiment for examining attached drawing description is exemplary, and is only used for explaining the present invention, and is not construed as limiting the claims.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one
It is a ", " described " and "the" may also comprise plural form.It is to be further understood that is used in the specification of the present invention arranges
It refers to there are the feature, integer, step, operation, element and/or component, but it is not excluded that presence or addition to take leave " comprising "
Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member
Part is " connected " or when " coupled " to another element, it can be directly connected or coupled to other elements, or there may also be
Intermediary element.In addition, " connection " used herein or " coupling " may include being wirelessly connected or coupling.Wording used herein
"and/or" includes any cell of one or more associated list items and all combines.
Those skilled in the art of the present technique are appreciated that unless otherwise defined, all terms used herein (including technology art
Language and scientific terminology) there is meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Should also
Understand, those terms such as defined in the general dictionary, which should be understood that, to be had and the meaning in the context of the prior art
The consistent meaning of justice, and unless defined as here, will not be with idealizing or the meaning of too formal be explained.
For ease of the understanding to the embodiment of the present invention, done further by taking several specific embodiments as an example below in conjunction with attached drawing
Explanation, and each embodiment does not constitute the restriction to the embodiment of the present invention.
Embodiment one
The reliability estimation method for the mixing alternating current-direct current power distribution network that an embodiment of the present invention provides a kind of containing flexible substation,
To the power distribution network containing flexible substation, fail-safe analysis that is simple and easy to do and meeting requirement of engineering is carried out.
A kind of reliability estimation method of mixing alternating current-direct current power distribution network containing flexible substation provided in an embodiment of the present invention
Process chart as shown in Figure 1, this method includes：
Step 1：Obtain the network topology and component reliability parameter value of power distribution network.
The network topology of power distribution network includes：Flexible substation, high-voltage alternating network, HVDC network, low-voltage alternating-current net
Network and DC.low voltage network.Wherein, high-voltage alternating network connects high-voltage ac power, and passes through high-voltage alternating inlet wire and flexible power transformation
It stands connection；HVDC network connects high-voltage DC power supply, and is connect with flexible substation by high voltage direct current inlet wire；Low-voltage alternating-current
Network is connect by low-voltage alternating-current outlet with flexible substation, and connects low-voltage alternating-current load；DC.low voltage network passes through low pressure
Direct current outlet is connect with flexible substation, and connects low-voltage direct load.
The element refers to the element containing flexible substation's power distribution network, including electric power electric transformer, breaker, every
Leave pass, busbar, distribution line and power transformer.It is described flexibility substation in element include but not limited to：Power electronics
Transformer, breaker, disconnecting switch and busbar.
Wherein, distribution line can be overhead line, can also be cable.
Breaker includes：Dc circuit breaker and AC circuit breaker.
Electric power electric transformer includes：Main circuit and control circuit.The main circuit is based on inner topology and interface needs
Including 5 conversion modules：The AC/DC converters of the first order, the DC/AC converters of the second level, the high frequency transformer of the third level,
The AC/DC converters of level Four and the DC/AC converters of level V, wherein the AC/DC converters of the first order are by high-voltage alternating
The DC/AC converters output low-voltage AC of input of the electricity as the electric power electric transformer, the level V is negative for exchanging
It carries and uses.Electric power electric transformer includes but not limited to：There are one DC port and an AC ports.
No matter the form of busbar can be single busbar, sectionalized single busbar connection in high-pressure side or low-pressure side in standing.It considers
The requirement of reliability or operation can select bridge connection, double-bus, double-bus segmentation etc..
Therefore, the flexible substation and the high-voltage alternating network, HVDC network, low-voltage alternating-current network and low pressure
The topological mode of DC network is as follows：
(1) inlet wire of flexible substation
A, the DC power supply in the HVDC network connects inlet wire side bus BUSHD, institute through the dc circuit breaker
The other side for stating BUSHD is connected to the high voltage direct current side of the electric power electric transformer through the dc circuit breaker.
B, AC power in high-voltage alternating network, respectively through two AC circuit breaker connection inlet wire side bus BUSHA1、
BUSHA2, the BUSHA1With the BUSHA2Pass through section switch SWBIt is connected, the BUSHA1It is connected through the AC circuit breaker
To the high-voltage alternating side of the electric power electric transformer, the BUSHA2It is connected to power transformer through the AC circuit breaker
High-pressure side.Power transformer refers to traditional transformer, such as the T2 in Fig. 4；Electric power electric transformer refers to using power electronics
The novel transformer of technology and Semiconductor Converting Technology, such as the T1 in Fig. 4.
(2) outlet of flexible substation
A, include DC load LOAD in the DC.low voltage networkD11With Bidirectional charging-discharging device LOADD12, described
LOADD11With the LOADD12Successively the electric power electric transformer is connected to through the dc circuit breaker and low-voltage direct busbar
Low-voltage direct side.
B, the sensitive AC load LOAD in the low-voltage alternating-current networkA1, handed over successively through the AC circuit breaker and low pressure
Busbar is flowed, the low-voltage alternating-current side of the electric power electric transformer is connected to.
C, the regular alternating current in the low-voltage alternating-current network loads LOADA2, handed over successively through the AC circuit breaker and low pressure
Busbar is flowed, the low-pressure side of power transformer is connected to.
The component reliability parameter value includes：Failure rate and repair time.
The electric power electric transformer, busbar, the failure rate of breaker and distribution line and repair time unite according to history
Count and check in, the electric power electric transformer, busbar, breaker and distribution line failure rate be respectively：PT、PBUS、PSW、
PLINE, the electric power electric transformer, busbar, breaker and distribution line repair time be respectively：RT、RBUS、RSW、RLINE。
Overhead transmission line be for connected in power distribution network between points, the circuit of taking aerial mode, point can be substation or electricity
Source or load etc..In view of existing overhead line in distribution line, also there is cable, therefore overhead transmission line can be replaced with distribution line.
Step 2：Determine the dependability parameter of distributed generation resource DG.
(1) dependability parameter of the distributed generation resource DG is set as PDG。
(2) installed capacity for predefining distributed generation resource DG, the failure rate for giving distributed generation resource are λDG, fault restoration
Time is RDG, according to the history data of the distributed generation resource DG of location, if year hours of operation is TDG, obtain and divide
The output power of cloth power supply DG, and be compared with load power, if the probability of distributed generation resource DG inactivitys output and event
Barrier rate is PDGi(i=1,2), then PDGFor：
Wherein, parameter 8760 refers to 1 year hourage, unit hour (h).
RDGIt is fault correction time, to calculate the known parameters of reliability, can be counted by the history run of DG
It arrives.
Wherein, PDGiRefer to the result calculated according to formula (1), (2).
Step 3：According to the network topology of the power distribution network, electric power electric transformer reliability model is built.
(1) transverter and high frequency transformer in electric power electric transformer obtains reliability ginseng with reference to history data
Number.
(2) according to the network topology of the power distribution network, the supply path of load point is determined, and then determine power electronics transformation
The module of electric power electric transformer to put into operation described in the method for operation of device and each supply path, by the module
Participate in operation.
In 5 comprising modules of above-mentioned electric power electric transformer PET, if the failure rate of each module is Ppet, and it is electric
The reliability P of the conversion module of power electronic transformerpetjFor known parameters, need not solve, it can going through by such conversion module
History operating statistic obtains.Repair time is Rpetj, the repair time RpetjFault time in year, wherein j=are calculated for solving
1 ... m, m≤5, m are the number of modules of electric power electric transformer input), then the failure rate of the electric power electric transformer
For：
Step 4：It can individually meet workload demand according to the distributed generation resource DG, establish the corresponding more power supplys of load
Fault tree or single supply fault tree.
Judge that can distributed generation resource DG individually meet workload demand, if the dependability parameter of distributed generation resource DG can be individually
Meet workload demand, then the corresponding more power failure trees of load is established, if the dependability parameter of distributed generation resource DG cannot be independent
Meet workload demand, then establishes the corresponding single supply fault tree of load.
This part thing of the system failure is defined as top event, the power that DG is sent out is greater than or equal to power distribution network internal loading demand
Occur the system failure when power and be denoted as top event A1, otherwise be denoted as top event A2, analysis can or cannot individually meet respectively accordingly
Network topology in the case of workload demand and load point supply path are analyzed layer by layer by top event the bottom of to according to fault tree theory
Event is element fault, to each load point, establishes the corresponding failure tree graph F of loadTAk(k=1,2).
Step 5：According to minimal cut set theory, using more power failure trees or the single supply fault tree, count respectively
Calculate the reliability index of each load in power distribution network.
According to minimal cut set theory, A is obtained by failure tree graph1、A2Minimal cut set under two states：A11…A1m, A21…
A2n, wherein Ak={ Xk1,Xk2,…,XklIt is bottom event XklSet；
A certain load point is calculated in A according to formula (5), (6)1、A2Year failure rate P in the case of two kindsAkWhen having a power failure with year
Between TAk, the year failure rate P of the load point is then obtained according to formula (7), (8) weightingLOADD11With year power off time TLOADD11；
Wherein, α2=1- α1。
Step 6：According to the reliability index of each load described in power distribution network, the reliability index of power distribution network is calculated.
According to the method in step 5, the year failure rate P of S load point in power distribution network is calculated successivelyLOADtHave a power failure with year
Time TLOADt, then the whole year failure rate of power distribution network be：
The whole year power off time of power distribution network is：
Embodiment two
This embodiment offers a kind of mixing alternating current-direct current distribution network reliability evaluation method containing flexible substation, it is specific
Implementation method is as shown in Figure 1, specific implementation background is the mixing alternating current-direct current power distribution network containing flexible substation, schematic diagram such as Fig. 2
Shown, which includes the AC network of a flexible substation and high pressure, the DC network of high pressure, the exchange of low pressure
Network and DC.low voltage network.
Either high-voltage alternating network, HVDC network or low-voltage alternating-current network, DC.low voltage network, wiring
Mode is determined according to actual conditions, can be connect respectively：High-voltage ac power, high-voltage DC power supply, low-voltage alternating-current load, low-voltage direct are negative
It carries.Power supply in Fig. 2 is equivalent source, for DC power supply, can be wind, electrically or optically lie prostrate distributed power supply；Load for etc.
Effect load can be the DC loads such as computer, data center or Bidirectional charging-discharging load for DC load；AC load
Be divided into custom power and regular alternating current load, wherein custom power refer to exchange output has particular/special requirement, as harmonic wave at
The requirement divided.Network connection simply uses：High-voltage alternating inlet wire, high voltage direct current inlet wire, low-voltage alternating-current outlet and low-pressure direct outflow
Line indicates.
Wherein, PET (power electric transformer, a power electronics are at least contained in flexible substation
Transformer), PET can be able to be four port modes, can also be other manner according to live needs, such as three ports, but at least
There are one DC port and an AC port, ensures there is exchange in network, also there is direct current.Other transformer can be tradition
Power transformer.According to the actual needs and design principle of substation, flexible substation can be arranged to single transformer
Pattern.
Primary system in flexible substation, for substation, refer to complete power transmission, transformation multiple electricity
The organic integration of power equipment；Transformer, breaker, disconnecting switch and busbar etc. are generally included, for simplicity, disconnecting switch is not
It indicates in fig. 2.Wherein, position and effect of the breaker according to it, is divided into：AC circuit breaker and dc circuit breaker.Wherein PET
Both sides, if setting breaker is determined according to design requirement, and substantially PET is power electronic equipment, the work(with breaker
Energy.No matter the form of busbar can be single busbar, sectionalized single busbar connection in high-pressure side or low-pressure side in standing；In view of reliability
Or the requirement of operation, bridge connection, double-bus, double-bus segmentation etc. can be selected.
In fig. 2, dotted line indicates flexible substation, AG1, AG2What is indicated is high-voltage ac power, and what DG was indicated is high pressure
Distributed generation resource；LOADA1That indicate is customization AC load, LOADA1That indicate is regular alternating current load, LOADD1The list of expression
To DC load, LOADD2The Bidirectional charging-discharging DC load of expression；LINEHA1、LINEHA2What is indicated is high-pressure side alternating current inlet wire,
LINEHDThat indicate is high-pressure side direct current inlet wire, LINELA1、LINELA2That indicate is low-pressure side exchange outlet, LINELD1、LINELD2
What is indicated is low-pressure side direct current outlet.TPETThat indicate is electric power electric transformer, TCONWhat is indicated is conventional electric power transformer,
BUSHA1, BUSHA2That indicate is high voltage AC bus, BUSHD1That indicate is high voltage dc bus, BUSLA1, BUSLA2It indicates respectively
Low-voltage alternating-current busbar, BUSLD1What is indicated is low-voltage direct busbar.SWHAI、SWHA2、SWHD1、SWHAI’、SWHA2’、SWHD1' respectively
That indicate is the breaker of high-pressure side exchange or direct current, SWLAI、SWLA2、SWLD1、SWLAI’、SWLA2’、SWLD1' indicate respectively
It is the breaker of low-pressure side exchange or direct current, SWBFor mother, mother is the open circuit connected in substation between two busbares
Device.
Electric power electric transformer in Fig. 2 includes two parts, when main circuit, second is that control circuit.Wherein main circuit base
Portion's topology and interface need in the inner, can be one such there are many pattern, Fig. 3, present invention flexibility substation uses
Electric power electric transformer structural schematic diagram.It includes 5 conversion modules that it is internal.From figure 3, it can be seen that this five module difference
It is：The AC/DC of the AC/DC converters of the first order, the DC/AC converters of the second level, the high frequency transformer of the third level, the fourth stage becomes
Parallel operation, the DC/AC converters of level V.The usual first order takes High Level AC Voltage as the defeated of electric power electric transformer from power grid
Enter, level V exports low-voltage AC and used for AC load.
Fail-safe analysis, problem needed to be considered are carried out for the mixing alternating current-direct current power distribution network containing flexible substation of Fig. 2
Have：Since the configuration of flexible substation, structure are all different from conventional substation, it is this new especially to contain electric power electric transformer
A power equipment and DC power supply for type is mostly output unsure state of contributing.
It is illustrated in figure 4 the load point supply path when mixing alternating current-direct current distribution network reliability containing flexible substation calculates
Figure.The case where only being powered jointly for DC load with DG and AC power 1, AC power 2, wherein storage are negative with direct current charge-discharge
It carries and is in charge mode, when load uses.Path 1 in figure, high-voltage ac power AG1Inlet wire is through AC circuit breaker SWHA1It is connected to
Inlet wire side bus BUSHA1, successively through breaker SWHA1`, electric power electric transformer T1High-voltage alternating survey AC1And 4 change mold changings
Block is to DC load LOADD11Power supply, then the failure rate of electric power electric transformer may be calculated as：
The specific mistake of fail-safe analysis is carried out with the mixing alternating current-direct current power distribution network containing flexible substation of the embodiment of the present invention
Journey is similar with preceding method embodiment, and details are not described herein again.
In conclusion network topology and component reliability parameter value of the embodiment of the present invention by acquisition power distribution network, determine
The dependability parameter of distributed generation resource DG；According to the network topology of power distribution network, electric power electric transformer reliability model is built；Root
It can individually meet workload demand according to distributed generation resource DG, establish the corresponding more power failure trees of load or single supply fault tree；
According to minimal cut set theory, using more power failure trees or single supply fault tree, calculate separately out each load in power distribution network can
By property index；According to the reliability index of each load in power distribution network, the reliability index of power distribution network is calculated.The present invention solves
Not yet commercialized running electric power electric transformer equipment application evaluating reliability of distribution network problem in the case of flexible substation is
Flexible substation project can research and planning and designing technical support is provided；It proposes with electric power electric transformer internal module
For the method for reliability calculation unit so that the distribution network reliability analysis containing flexible substation, it is not only simple and easy to do, but also can meet
Requirement of engineering.
One of ordinary skill in the art will appreciate that：Attached drawing is the schematic diagram of one embodiment, module in attached drawing or
Flow is not necessarily implemented necessary to the present invention.
Each embodiment in this specification is described in a progressive manner, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for device or
For system embodiment, since it is substantially similar to the method embodiment, so describing fairly simple, related place is referring to method
The part of embodiment illustrates.Apparatus and system embodiment described above is only schematical, wherein the conduct
The unit that separating component illustrates may or may not be physically separated, the component shown as unit can be or
Person may not be physical unit, you can be located at a place, or may be distributed over multiple network units.It can root
According to actual need that some or all of module therein is selected to achieve the purpose of the solution of this embodiment.Ordinary skill
Personnel are without creative efforts, you can to understand and implement.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art in the technical scope disclosed by the present invention, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
Subject to.
Claims (10)
1. a kind of reliability estimation method of the mixing alternating current-direct current power distribution network containing flexible substation, which is characterized in that this method packet
It includes：
Obtain the network topology and component reliability parameter value of power distribution network；
Determine the dependability parameter of distributed generation resource DG；
According to the network topology of the power distribution network, electric power electric transformer reliability model is built；
It can individually meet workload demand according to the distributed generation resource DG, establish the corresponding more power failure trees of load or single electricity
Source fault tree；
According to minimal cut set theory, using more power failure trees or the single supply fault tree, power distribution network is calculated separately out
In each load reliability index；
According to the reliability index of each load described in power distribution network, the reliability index of power distribution network is calculated.
2. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 1 containing flexible substation, feature
It is, the network topology and component reliability parameter value of the acquisition power distribution network, including：
The network topology of the power distribution network includes：Flexible substation, high-voltage alternating network, HVDC network, low-voltage alternating-current
Network and DC.low voltage network；
The high-voltage alternating network connects high-voltage ac power, and is connect with the flexible substation by high-voltage alternating inlet wire；
The HVDC network connects high-voltage DC power supply, and is connect with the flexible substation by high voltage direct current inlet wire；
The low-voltage alternating-current network is connect by low-voltage alternating-current outlet with the flexible substation, and connects low-voltage alternating-current load；
The DC.low voltage network is connect by low-voltage direct outlet with the flexible substation, and connects low-voltage direct load.
3. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 2 containing flexible substation, feature
It is, the network topology and component reliability parameter value of the acquisition power distribution network further include：
The element refers to the element containing flexible substation's power distribution network, including：Electric power electric transformer, breaker, disconnecting switch,
Busbar, distribution line and power transformer, the element in flexible substation include but not limited to：Electric power electric transformer, open circuit
Device, disconnecting switch and busbar；
Wherein, the distribution line is overhead line or cable；
The breaker includes：Dc circuit breaker and AC circuit breaker；
The electric power electric transformer includes：Main circuit and control circuit, it includes 5 that the main circuit, which is based on inner topology and interface,
A conversion module：AC/DC converters, the DC/AC converters of the second level, the high frequency transformer of the third level, the fourth stage of the first order
AC/DC converters and level V DC/AC converters, wherein the AC/DC converters of the first order make High Level AC Voltage
DC/AC converters output low-voltage AC for the input of the electric power electric transformer, the level V makes for AC load
With；
The electric power electric transformer includes but not limited to：There are one DC port and an AC ports；
The busbar uses：Single busbar, sectionalized single busbar connection, bridge connection, double-bus or double-bus segmentation.
4. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 3 containing flexible substation, feature
It is, the network topology and component reliability parameter value of the acquisition power distribution network further include：
The flexibility substation and the high-voltage alternating network, HVDC network, low-voltage alternating-current network and DC.low voltage network
Topological mode be：
The inlet wire of the flexibility substation：DC power supply in the HVDC network, through the dc circuit breaker connect into
Line side busbar BUSHD, the BUSHDThe other side the high straightening of the electric power electric transformer is connected to through the dc circuit breaker
Flow side；
AC power in the high-voltage alternating network, respectively through two AC circuit breaker connection inlet wire side bus BUSHA1、
BUSHA2, the BUSHA1With the BUSHA2Pass through section switch SWBIt is connected, the BUSHA1It is connected through the AC circuit breaker
To the high-voltage alternating side of the electric power electric transformer, the BUSHA2It is connected to power transformer through the AC circuit breaker
High-pressure side；
The outlet of the flexibility substation：Include DC load LOAD in the DC.low voltage networkD11With Bidirectional charging-discharging device
LOADD12, the LOADD11With the LOADD12Successively the electric power is connected to through the dc circuit breaker and low-voltage direct busbar
The low-voltage direct side of electronic transformer；
Sensitive AC load LOAD in the low-voltage alternating-current networkA1, successively through the AC circuit breaker and low-voltage alternating-current busbar,
It is connected to the low-voltage alternating-current side of the electric power electric transformer；
Regular alternating current in the low-voltage alternating-current network loads LOADA2, successively through the AC circuit breaker and low-voltage alternating-current busbar,
It is connected to the low-pressure side of power transformer.
5. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 4 containing flexible substation, feature
It is, the network topology and component reliability parameter value of the acquisition power distribution network further include：
The component reliability parameter value includes：Failure rate and repair time；
The electric power electric transformer, busbar, the failure rate of breaker and distribution line and repair time are according to historical statistics number
It is investigated that, the electric power electric transformer, busbar, breaker and distribution line failure rate be respectively：PT、PBUS、PSW、PLINE,
The electric power electric transformer, busbar, breaker and distribution line repair time be respectively：RT、RBUS、RSW、RLINE。
6. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 1 containing flexible substation, feature
It is, the dependability parameter of the determination distributed generation resource DG, including：
If the dependability parameter of the distributed generation resource DG is PDG；
The installed capacity of distributed generation resource DG is predefined, the failure rate for giving distributed generation resource is λDG, fault correction time is
RDG, according to the history data of the distributed generation resource DG of location, if year hours of operation is TDG, obtain distributed electrical
The output power of source DG, and be compared with load power, if the probability of distributed generation resource DG inactivitys output and failure rate are
PDGi(i=1,2), then PDGFor：
Wherein, 8760=24 hours/day × 365 day/year, refer to 1 year hourage, unit is hour h；
RDGIt is the known parameters for calculating reliability for the fault correction time of DG, is counted by the history data of DG
It obtains；
Wherein, PDGiRefer to the result calculated according to formula (1), (2).
7. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 1 containing flexible substation, feature
It is, the network topology according to the power distribution network, builds electric power electric transformer reliability model, including：
Transverter in the electric power electric transformer and high frequency transformer obtain dependability parameter with reference to history data；
According to the network topology of the power distribution network, the supply path of load point is determined, and then determine the fortune of electric power electric transformer
The module is participated in transporting by the module of electric power electric transformer to put into operation described in line mode and each supply path
It calculates；
The module is 5 conversion modules of the electric power electric transformer PET, if the failure rate of each module is Ppetj, institute
State the reliability P of the conversion module of electric power electric transformerpetjFor known parameters, by the history data of such conversion module
Statistics obtains, repair time Rpetj, for calculating fault time in year, wherein j=1 ... m, m≤5, m are the electric power electricity
The number of modules of sub- transformer input, then the failure rate of the electric power electric transformer be：
8. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 1 containing flexible substation, feature
Be, it is described that can workload demand be individually met according to distributed generation resource DG, establish the corresponding more power failure trees of load or
Single supply fault tree, including：
Judge that can distributed generation resource DG individually meet workload demand, if the dependability parameter of distributed generation resource DG can individually meet
Workload demand then establishes the corresponding more power failure trees of load, if the dependability parameter of distributed generation resource DG cannot individually meet
Workload demand then establishes the corresponding single supply fault tree of load；
This part thing of the system failure is defined as top event, the power that DG is sent out is greater than or equal to the power of power distribution network internal loading demand
When there is the system failure and be denoted as top event A1, otherwise be top event A2.Analysis can or cannot individually meet load need respectively accordingly
Network topology in the case of asking and load point supply path are analyzed to bottom event by top event according to fault tree theory and are layer by layer
Element fault establishes the corresponding failure tree graph F of load to each load pointTAk(k=1,2).
9. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 1 containing flexible substation, feature
It is, it is described according to minimal cut set theory, using more power failure trees or the single supply fault tree, calculate separately out
The reliability index of each load in power distribution network, including：
According to minimal cut set theory, A is obtained by failure tree graph1、A2Minimal cut set under two states：A11…A1m, A21…A2n,
In, Ak={ Xk1,Xk2,…,XklIt is bottom event XklSet；
A certain load point is calculated in A according to formula (5), (6)1、A2Year failure rate P in the case of two kindsAkWith year power off time TAk,
Then the year failure rate P of the load point is obtained according to formula (7) (8) weightingLOADD11With year power off time TLOADD11；
Wherein, α2=1- α1。
10. the mixing alternating current-direct current distribution network reliability evaluation method according to claim 1 containing flexible substation, feature
It is, the reliability index according to each load in power distribution network, calculates the reliability index of power distribution network, including：
The year failure rate P of S load point in power distribution network is calculated successivelyLOADtWith year power off time TLOADt, then the entirety of power distribution network
Year failure rate is：
The whole year power off time of power distribution network is：
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638897A (en) * | 2018-12-04 | 2019-04-16 | 国网冀北电力有限公司 | A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network |
| CN109995016A (en) * | 2019-04-10 | 2019-07-09 | 国网江苏省电力有限公司 | A kind of DC distribution host's power configuration system and method for more power supplys |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106971264A (en) * | 2017-03-21 | 2017-07-21 | 华北电力大学 | A kind of alternating current-direct current mixing micro-capacitance sensor analysis method for reliability |
| CN107633333A (en) * | 2017-10-16 | 2018-01-26 | 国家电网公司 | The source lotus storage method for optimizing scheduling and system of flexible transformer station's regional power grid |
-
2018
- 2018-05-16 CN CN201810466643.3A patent/CN108565858B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106971264A (en) * | 2017-03-21 | 2017-07-21 | 华北电力大学 | A kind of alternating current-direct current mixing micro-capacitance sensor analysis method for reliability |
| CN107633333A (en) * | 2017-10-16 | 2018-01-26 | 国家电网公司 | The source lotus storage method for optimizing scheduling and system of flexible transformer station's regional power grid |
Non-Patent Citations (2)
| Title |
|---|
| 李子欣等: "《电力电子变压器技术研究综述》", 《中国电机工程学报》 * |
| 魏如峰: "《含分布式电源配电网可靠性评估方法研究》", 《CNKI优秀硕士论文库》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109638897A (en) * | 2018-12-04 | 2019-04-16 | 国网冀北电力有限公司 | A kind of cooperative control method suitable for alternating current-direct current mixing power distribution network |
| CN109995016A (en) * | 2019-04-10 | 2019-07-09 | 国网江苏省电力有限公司 | A kind of DC distribution host's power configuration system and method for more power supplys |
| CN109995016B (en) * | 2019-04-10 | 2022-08-19 | 国网江苏省电力有限公司 | Multi-power-supply direct-current power distribution network main power supply configuration system and method |
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