AU2021106381A4 - Method for Calculating Power Supply Reliability of Power Distribution Network Capable of Considering Multifunctional Power Distribution Automation Terminals - Google Patents
Method for Calculating Power Supply Reliability of Power Distribution Network Capable of Considering Multifunctional Power Distribution Automation Terminals Download PDFInfo
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
- G05B23/0275—Fault isolation and identification, e.g. classify fault; estimate cause or root of failure
- G05B23/0281—Quantitative, e.g. mathematical distance; Clustering; Neural networks; Statistical analysis
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2513—Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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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
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/30—State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
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Abstract
The present invention provides a method for calculating power supply reliability
of a power distribution network capable of considering multifunctional power
distribution automation terminals, which belongs to the technical field of electric power
engineering. Different automation function configurations of a current power
distribution network are comprehensively considered, so that power distribution
automation is divided into four function modes, including a non-automation mode, an
automatic positioning mode, an automatic isolation mode and an automatic transfer
mode. The power supply reliability of a line under different automation function modes
can be subjected to quantitative analysis, and a reliability index which considers fault
outage is given. Through calculation, a quantification result of a power distribution
network planning and transforming effect can be obtained to find weak links which are
still in a network, so that the method has an important meaning for improving the power
supply reliability and guiding the construction and the planning of the power
distributionnetwork.
FIGURE OF THE SPECIFICATION
Determine a switch
type according to a
target system
Perform fault hypothesis
on a component
Value a load point reliability Value a load point reliability
parameter of main feeder parameter of main branch line
component fault compone nt fault
If yes
Where i is
greater than n
If no
Calculate a reliability
index
End
FIG. 1
rc--cl a ss isolIa ti on- -i5 cIa ss
A c area Dsisolati area A
A-class isolation]
area - .- - - - - - - -
FIG. 2
Description
Determine a switch type according to a target system
Perform fault hypothesis on a component
Value a load point reliability Value a load point reliability parameter of main feeder parameter of main branch line component fault compone nt fault
If yes Where i is greater than n
If no
Calculate a reliability index
End
FIG. 1
rc--cl a ss isolIati on- - i5 cIa ss A c area Dsisolati area A A-class isolation] area - .- - - - - - - -
FIG. 2
Method for Calculating Power Supply Reliability of Power Distribution Network
Capable of Considering Multifunctional Power Distribution Automation
Terminals
The present invention relates to the technical field of electric power engineering,
and in particular to, a method for calculating power supply reliability of a power
distribution network capable of considering multifunctional power distribution
automation terminals.
With the acceleration of the construction of a smart grid in China, the automation
of a distribution network, which is an important foundation of the smart grid, has
developed rapidly. However, compared with developed countries, the intelligent
construction of the distribution network in China is still at the beginning stage. Due to
economic development and other reasons, the development of a power grid in urban
and rural areas, eastern and central and western areas of China is unbalanced with
obvious gaps in grid structures of various regions. Under different grid foundations and
load densities, power distribution automation modes and communication methods are
different, leading to different levels of automation and different functions that are
implemented.
A power distribution automation system is an integrated system for remotely
monitoring, coordinating and controlling power distribution network component
equipment in real time, is application of a modern computer technology and a
communication technology in power distribution network monitoring and controlling,
and mainly achieves its function by information network, information terminal
equipment and a master station system. Powder distribution automation is divided into an automatic positioning mode, an automatic isolation mode and an automatic transfer mode according to difference of function positioning. The power distribution automation mode is called the "automatic positioning mode" to quickly locate the faults of the power distribution network and monitor the operation state of the power distribution network. The automatic fault isolation mode based on the "automatic positioning mode" is called the "automatic isolation mode". The automatic transfer node in non-faulty areas based on the "automatic isolation mode" is called the
"automatic transfer mode". The power distribution automation function can be
achieved to improve power supply reliability of the power distribution network, but
different power distribution automation modes have different effects on the reliability
of power supply. Therefore, establishing a multi-level power distribution automation
function on the reliability of the power distribution network can more accurately
evaluate the system performance, identify the weak links of the system, and play a
scientific guiding role in the construction and planning of the power distribution
network.
To solve the defects in the background art, the objective of the present invention is
to provide a method for calculating power supply reliability of a power distribution
network capable of considering multifunctional power distribution automation
terminals, which divides power distribution automation into four function modes,
including a non-automation mode, an automatic positioning mode, an automatic
isolation mode and an automatic transfer mode by comprehensively considering
different automation function configurations of a current power distribution network.
The power supply reliability of a line under different automation function modes can be
subjected to quantitative analysis, and a reliability index which considers fault outage is given. Through calculation, a quantification result of a power distribution network planning and transforming effect can be obtained, weak links which are still in the network can be found, and therefore, the method has an important meaning for improving power supply reliability and guiding the construction and the planning of the power distribution network.
To solve the problems, the present invention adopts the following technical
solution:
A method for calculating power supply reliability of a power distribution network
capable of considering multifunctional power distribution automation terminals
includes the following steps:
step 1, determining an automation function mode configured according to the
switch type of a given target power distribution network;
step 2, determining parameters adopted for load point reliability calculation under
faults of a main feeder component according to the determined automation function
mode;
step 3, determining parameters adopted for load point reliability calculation under
faults of branch line components according to the determined automation function
mode;
step 4, calculating a reliability index of the target power distribution network
according to reliability parameters in step 2 and step 3.
The switch type in step 1 includes a A-class switch, a B-class switch, a C-class
switch and a D-class switch, where the A-class switch has the shortest positioning
isolation time and transfer time corresponding to the automation transfer mode, the
B-class switch has shorter positioning isolation time and transfer time corresponding to
the automation isolation mode, the C-class switch has longer positioning isolation time and transfer time corresponding to the automation positioning mode, and the D-class switch has the longest positioning isolation time and transfer time corresponding to the non-automation mode.
The automation function mode in step 1 includes a non-automation mode, an
automatic positioning module, an automatic isolation module and an automatic transfer
mode.
The specific process of calculating the reliability parameters of a main feeder in
step 2 includes:
step 2.1, dividing isolation areas by the switch type given in step 1;
step 2.2, searching the isolation areas from A to D based on automation level
according to the isolation areas divided in step 2.1 when the main feeder component i
has faults until the smallest isolation area in which the fault component i is located is
searched, where reliability of a load point j in different isolation areas is calculated by a
fault rate Xj, and fault outage time rj,i of a corresponding fault component i.
In step 2.1, the isolation areas are divided by taking a switch as a boundary, and
components among switches are integrated as an area, an area between adjacent
switches is called the smallest isolation area, an area isolated by the A-class switch is
called an A-class isolation area, an area isolated by the B-class switch is called a
B-class isolation area, an area isolated by the C-class switch is called a C-class isolation
area, and an area isolated by the D-class switch is called a D-class isolation area.
The searching process in step 2.2 is as follows:
If the line is configured with the A-class switch and the fault is in the A-class
isolation area, the fault rate and the fault outage time corresponding to the load point set
JAl at the upstream of the A-class isolation area are respectively taken as the fault rate Xi
of the fault component i and the fault positioning isolation time rA under the automation transfer mode; and the fault rate and fault outage time corresponding to the load point setJA2at the downstream of A-class isolation area respectively take the fault rate Xi of the fault component i and the transfer time rtAunder the automatic transfer mode, the formula is as follows:
Xjji=XijE JAl (I)
rjjrAjE JA1 (2)
Xj,iXi,jEJA2 (3)
rjjrtAjEJA2 (4);
If the line is configured with the B-class switch and the fault is in the B-class
isolation area, the fault rate and the fault outage time corresponding to the load point set
JBl at the upstream of the B-class isolation area are respectively taken as the fault rate Xi
of the fault component i and the fault positioning isolation time rBunder the automation
isolation mode; and the fault rate and fault outage time corresponding to the load point
setJB2at the downstream of B-class isolation area respectively take the fault rate Xi of
the fault component i and the transfer time rtB under the automatic isolation mode
according to the formula as follows:
Xj,iXi,jEJB1 (5)
rji rBjEJB1 (6)
XjjiXi,jEJB2 (7);
rji rtBjEJB2 (8);
If the line is configured with the C-class switch and the fault is in the C-class
isolation area, a load point set in the area between the first encounter switch at the
upstream of the C-class isolation area and the switch (a first-end switch of the line if the
switch with higher automation level is absent) with higher first encounter automation level at the upstream is Jci, and the fault rate and the fault outage time corresponding to the load point set are respectively taken as the fault rate Xi of the fault component i and the fault positioning isolation time rc under the automation positioning mode; a load point set in the area between the first encounter switch at the downstream of the C-class isolation area and the switch (a tail-end switch of the line if the switch with higher automation level is absent) with higher first encounter automation level at the downstream is Jc2, and the fault rate and the fault outage time corresponding to the load point set are respectively taken as the fault rate Xi of the fault component i and the transfer time rtc under the automation positioning mode according to the formula as follows: xj'i =Xi~j EJc (9); rj,i=rc,jEJci (10)
Xjji=Xi~jE Jc2 (I11)
rj,i=rtc,jEJc2 (12);
If the line is configured with the D-class switch and the fault is in the D-class
isolation area, a load point set in the area between the first encounter switch at the
upstream of the D-class isolation area and the switch (a first-end switch of the line if the
switch with higher automation level is absent) with higher first encounter automation
level at the upstream is JD1, and the fault rate and the fault outage time corresponding to
the load point set are respectively taken as the fault rate Xi of the fault component i and
the fault positioning isolation time rD under the non-automation mode; a load point set
in the area between the first encounter switch at the downstream of the D-class isolation
area and the switch (a first-end switch of the line if the switch with higher automation
level is absent) with higher first encounter automation level at the downstream is JD2,
and the fault rate and the fault outage time corresponding to the load point set are respectively taken as the fault rate Xi of the fault component i and the transfer time rtD under the non-automation mode according to the formula as follows: kj,i=Xi,jEJD1 (13) rj,i=rD,jEJD1 (14) kj,i=Xi,jEJD2 (15) rj,i=rtD,jEJD2 (16);
The range of the smallest isolation area is continuously reduced from A to D to
finally find the smallest isolation area in which the fault component i is located can be
searched; the load point set in the isolation area is Jf, and the fault rate and the fault
outage time corresponding to the load points when the component has faults are
respectively taken as the fault rate Xi and component repair time ri of the fault
component i according to the formula as follows:
Xj ii,jEJf(17)
rj, ri,jEJf(18).
The specific process in step 3 includes:
step 3.1, for the fault of the system branch line component i, dividing the branch
line into a D-class branch isolation area, a C-class branch isolation area and a B-class
branch isolation area when a first encounter D-class switch, a first encounter C-class
switch and a first encounter B-class switch is at the upstream of the fault component;
step 3.2, according to the branch isolation areas divided in step 3.1, searching the
isolation areas by taking the smallest isolation area in which the fault component is
located as a starting point, and adopting the fault rateX'j,i and the fault outage time r'j,i of
the corresponding fault component for calculating reliability of the load points j in
different isolation areas.
The specific process in step 3.2 is as follows:
Parameters for calculating reliability of a load point set J'f in the smallest isolation
area in which the fault component is located and a downstream area thereof are
respectively taken as a fault rate of the branch line fault component i and repair time r'i
of the component according to the formula as follows:
'ji= X'i,jEJ'f (19)
r'j,i=r'i,jEJ'f (20);
For the D-class branch isolation area, parameters for calculating reliability of a
load point set J'D1 in the switch area with higher first encounter automation level of the
first encounter switch at the upstream are respectively taken as a fault rate X'i of the
branch line fault component i and fault position isolation time r'D under the
non-automation mode according to the formula as follows:
X'j,i=X'ijEJ'D1 (21)
r'j,i=r'D,jEJ'D1(22);
For the C-class branch isolation area, parameters for calculating reliability of a
load point set J'ci in the switch area with higher first encounter automation level of the
first encounter switch at the upstream are respectively taken as a fault rate X'i of the
branch line fault component i and fault position isolation time r'c under the
non-automation mode according to the formula as follows:
'jji=X'ijEJ'ci (23)
r'j,i=r'c,jEJ'ci (24);
For the B-class branch isolation area, parameters for calculating reliability of a
load point set J'B outside the B-class branch isolation area are respectively taken as a
fault rate X'i of the branch line fault component i and fault position isolation time r'B
under the automation isolation mode according to the formula as follows:
'jji=X'ijEJ'B1 (25)
r'j,i=r'B,jEJ'B1 (26);
If there is no B-class switch on the branch line, the fault of the branch line
component will cause power outage of a main feeder section accessed into the branch
line;
1) if the main feeder is configured with the A-class isolation area, the parameters
for calculating the reliability of the load point set outside the A-class isolation area are
respectively as follows: the load point set J'Al at the upstream of the A-class isolation
area is respectively taken as the fault rate X'i of the branch line fault component i and the
fault positioning isolation time r'A under the automation transfer mode; and the load
point set J'A2 at the downstream of the A-class isolation area is respectively taken as the
fault rate X'i of the branch line fault component i and the transfer time r'tA under the
automatic transfer mode according to the formula is as follows:
'jji=X'ijEJ'A1(27)
r'ji=r'AjEJA1 (28)
X'j i=X'ijEJ'A2 (29)
r'j,i=r'tAjEJ'A2 (30);
2) if the main feeder is configured with the B-class isolation area, the parameters
for calculating the reliability of the load point set outside the B-class isolation area are
respectively as follows: the load point set JBi at the upstream of the B-class isolation
area is respectively taken as the fault rate X'i of the branch line fault component i and the
fault positioning isolation time r'B under the automation isolation mode; and the load
point set J'B2 at the downstream of the B-class isolation area is respectively taken as the
fault rate X'i of the branch line fault component i and the transfer time r'tB under the
automatic transfer mode according to the formula is as follows:
X'j,i = 'ijEJ'Bl1 (31)
r'j,i=r'B,jEJ'B1 (32);
Xj,i=X'i,jEJ'B2 (33)
r'j,i=r'tB,jEJTB2 (34);
For an unvalued load point set J'rest in the A-class isolation area and the B-class
isolation area,
1) if there is a C-class switch on the branch line, the parameters for calculating the
reliability of the unvalued load point set are respectively taken as the fault rate X'i of the
branch line fault component i and the fault positioning isolation time r'c under the
automation positioning mode according to the formula as follows:
'j,i =X'i,jEJrest (35)
r'j,i=r'c,jEJ'rest (36);
2) if there is only a D-class switch on the branch line, the parameters for
calculating the reliability of the unvalued load point set are respectively taken as the
fault rate X'i of the branch line fault component i and the fault positioning isolation time
r'D under the non-automation mode according to the formula as follows:
X'j,i X'ijEJrest (37)
r'j,i r'D,jE rest (38).
The specific process of calculating the reliability index in step 4 includes:
performing fault hypothesis on every component for a target network frame with n
system components and m load points, repeating step 2 or step 3 to determine basic
parameters for calculating the reliability of each load point under the fault condition of
each component; defining the reliability parameters of the load joint j as an outage rate Xj, fault outage time rj each time and annual average outage time Uj, where j is equal to 1, K, i, K m; j is equal to superposition of influences, on the fault rate of the point, of the fault of each system component according to the formula as follows: a (39) rj is equal to superposition of influences, on the outage time of the point, of the fault of each system component according to the formula as follows:
(40) The annual average power outage time Uj is calculated according to the formula as
follows:
Ui= xr. i (A4 Jj(41) The reliability index of the load points can be combined with load point access
user number Nj in basic data to calculate the reliability index of the system as follows:
An average power outage frequency index SAIFI of the system is as follows:
SAIFI = Nj (42) A power outage duration index SAIDI of the system is as follows:
I (U, x Ni) SA IDI = ZNi J (43)
An average power supply available rate index ASAI- is as follows:
8760 8760 -SAIDI 5.. N, 8760 8760 (44) With the adoption of the technical scheme, the present invention has the following
remarkable effects:
Different automation function configurations of a current power distribution
network are comprehensively considered, so that power distribution automation is
divided into four function modes, including a non-automation mode, an automatic
positioning mode, an automatic isolation mode and an automatic transfer mode. The
power supply reliability of a line under different automation function modes can be
subjected to quantitative analysis, and a reliability index which considers fault outage is
given. Through calculation, a quantification result of a power distribution network
planning and transforming effect can be obtained, weak links which are still in the
network can be found, and therefore, the method has an important meaning for
improving power supply reliability and guiding the construction and the planning of the
power distribution network.
FIG. 1 is a flowchart of the present invention.
FIG. 2 is a division diagram of a main feeder isolation area of the present
invention.
FIG. 3 is a division diagram of a branch line isolation area of the present invention.
FIG. 4 is a classical structural diagram of a power distribution network of the
present invention.
In order to make the purpose, technical scheme and advantages of the present
invention clears and more obvious, the present invention will be further illustrated in
detail with reference to accompanying figures and embodiments hereinafter. However,
it should be noted that many of the details listed in the description are only for the
reader to have a thorough understanding of one or more aspects of the present
invention, and these aspects of the present invention can be implemented without these
specific details.
As shown in FIG. 1, a method for calculating power supply reliability of a power
distribution network capable of considering multifunctional power distribution
automation terminals includes the as follows steps:
step 1, determining an automation function mode configured according to the
switch type of a given of target power distribution network. The influences of power
distribution automation on the reliability of the power distribution network are mainly
reflected by implementation speed of fault searching isolation and transfer, and fault
isolation and power supply restoration are accomplished by operating a switch device.
The switch type includes a A-class switch, a B-class switch, a C-class switch and a
D-class switch, where the A-class switch has the shortest positioning isolation time and
transfer time corresponding to the automation transfer mode, the B-class switch has
shorter positioning isolation time and transfer time corresponding to the automation
isolation mode, the C-class switch has longer positioning isolation time and transfer
time corresponding to the automation positioning mode, and the D-class switch has the
longest positioning isolation time and transfer time corresponding to the
non-automation mode. The automation function mode includes a non-automation
mode, an automatic positioning module, an automatic isolation module and an
automatic transfer mode.
Step 2, determining parameters adopted for load point reliability calculation under
faults of a main feeder component according to the determined automation function
mode. The specific process is as follows:
step 2.1, dividing isolation areas according to the switch type given in step 1. The
isolation areas are divided by taking a switch as a boundary, and components among
switches are integrated as an area, an area between adjacent switches is called the
smallest isolation area, an area isolated by the A-class switch is called an A-class
isolation area, an area isolated by the B-class switch is called a B-class isolation area, an
area isolated by the C-class switch is called a C-class isolation area, and an area isolated
by the D-class switch is called a D-class isolation area.
step 2.2, searching the isolation areas from A to D based on automation level
according to the isolation areas divided in step 2.1 when the main feeder component i
has faults until the smallest isolation area in which the fault component i is located is
searched, where reliability of a load point j in different isolation areas is calculated by a
fault rate j, and fault outage time rj,i of a corresponding fault component i.
The specific process is as follows:
If the line is configured with the A-class switch and the fault is in the A-class
isolation area, the fault rate and the fault outage time corresponding to the load point set
JAl at the upstream of the A-class isolation area are respectively taken as the fault rate Xi
of the fault component i and the fault positioning isolation time rA under the automation
transfer mode; and the fault rate and fault outage time corresponding to the load point
set JA2 at the downstream of A-class isolation area respectively take the fault rate Xi of
the fault component i and the transfer time rtA under the automatic transfer mode, the
formula is as follows:
XjJi=Xi,jEJAl (1) rjirA,jE JA 1(2)
Xj,iXi,jEJA2 (3)
rj,i=rtA,jEJA2 (4);
If the line is configured with the B-class switch and the fault is in the B-class
isolation area, the fault rate and the fault outage time corresponding to the load point set
JBl at the upstream of the B-class isolation area are respectively taken as the fault rate Xi
of the fault component i and the fault positioning isolation time rB under the automation
isolation mode; and the fault rate and fault outage time corresponding to the load point
set JB2 at the downstream of B-class isolation area respectively take the fault rate Xi of
the fault component i and the transfer time rtB under the automatic isolation mode
according to the formula as follows:
Xj,i=Xi,jEJB1 (5)
rj,i=rB,jEJBl (6)
kj,i=Xi,jEJB2 (7);
rj,i=rtB,jEJB2 (8);
If the line is configured with the C-class switch and the fault is in the C-class
isolation area, a load point set in the area between the first encounter switch at the
upstream of the C-class isolation area and the switch (a first-end switch of the line if the
switch with higher automation level is absent) with higher first encounter automation
level at the upstream is Jc1, and the fault rate and the fault outage time corresponding to
the load point set are respectively taken as the fault rate Xi of the fault component i and
the fault positioning isolation time rc under the automation positioning mode; a load
point set in the area between the first encounter switch at the downstream of the C-class
isolation area and the switch (a tail-end switch of the line if the switch with higher automation level is absent) with higher first encounter automation level at the downstreamis Jc2, and the fault rate and the fault outage time corresponding to the load point set are respectively taken as the fault rate Xi of the fault component i and the transfer time rtc under the automation positioning mode according to the formula as follows: j'i =Xi~j EJ J1 (9); rj,i=rc,jEJci (10) jj ilijE Jc2 (I11) rji rtc,jEJc2 (12);
If the line is configured with the D-class switch and the fault is in the D-class
isolation area, a load point set in the area between the first encounter switch at the
upstream of the D-class isolation area and the switch (a first-end switch of the line if the
switch with higher automation level is absent) with higher first encounter automation
level at the upstreamis JD1, and the fault rate and the fault outage time corresponding to
the load point set are respectively taken as the fault rate Xi of the fault component i and
the fault positioning isolation time rDunder the non-automation mode; a load point set
in the area between the first encounter switch at the downstream of the D-class isolation
area and the switch (a first-end switch of the line if the switch with higher automation
level is absent) with higher first encounter automation level at the downstreamis JD2,
and the fault rate and the fault outage time corresponding to the load point set are
respectively taken as the fault rate Xi of the fault component i and the transfer time rtD
under the non-automation mode according to the formula as follows:
jj ilij EJD 1 (13)
rjji rD~jE JD 1 (14)
Xj,i=Xi,jEJD2 (15)
rjji= rtD~jE JD2 (1l6);
The range of the smallest isolation area is continuously reduced from A to D to
finally find the smallest isolation area in which the fault component i is located can be
searched; the load point set in the isolation area is Jf, and the fault rate and the fault
outage time corresponding to the load points when the component has faults are
respectively taken as the fault rate Xi and component repair time ri of the fault
component i according to the formula as follows:
Xj ii,jEJf(17)
rji ri,jEJf(18).
step 3, determining parameters adopted for load point reliability calculation under
faults of branch line components according to the determined automation function
mode; and the specific process includes:
step 3.1, for the fault of the system branch line component i, dividing the branch
line into a D-class branch isolation area, a C-class branch isolation area and a B-class
branch isolation area when a first encounter D-class switch, a first encounter C-class
switch and a first encounter B-class switch is at the upstream of the fault component;
step 3.2, according to the branch isolation areas divided in step 3.1, searching the
isolation areas by taking the smallest isolation area in which the fault component is
located as a starting point, and adopting the fault rateX'j,i and the fault outage time r'j,i of
the corresponding fault component for calculating reliability of the load points j in
different isolation areas.
The specific process in step 3.2 is as follows:
Parameters for calculating reliability of a load point set J'f in the smallest isolation
area in which the fault component is located and a downstream area thereof are respectively taken as a fault rate of the branch line fault component i and repair time r'i of the component according to the formula as follows:
'ji= X'i,jEJ'f (19)
r'j,i=r'i,jEJ'f (20);
For the D-class branch isolation area, parameters for calculating reliability of a
load point set J'D1 in the switch area with higher first encounter automation level of the
first encounter switch at the upstream are respectively taken as a fault rate X'i of the
branch line fault component i and fault position isolation time r'D under the
non-automation mode according to the formula as follows:
X'j,i=X'ijEJ'D1 (21)
r'j,i=r'D,jEJ'D1(22);
For the C-class branch isolation area, parameters for calculating reliability of a
load point set J'ci in the switch area with higher first encounter automation level of the
first encounter switch at the upstream are respectively taken as a fault rate X'i of the
branch line fault component i and fault position isolation time r'c under the
non-automation mode according to the formula as follows:
'jji=X'ijEJ'ci (23)
r'j,i=r'c,jEJ'ci (24);
For the B-class branch isolation area, parameters for calculating reliability of a
load point set J'B outside the B-class branch isolation area are respectively taken as a
fault rate X'i of the branch line fault component i and fault position isolation time r'B
under the automation isolation mode according to the formula as follows:
X'j,i=X'i,jEJ'B1 (25)
r'j,i=r'B,jE J B1 (26);
If there is no B-class switch on the branch line, the fault of the branch line
component will cause power outage of a main feeder section accessed into the branch
line;
1) if the main feeder is configured with the A-class isolation area, the parameters
for calculating the reliability of the load point set outside the A-class isolation area are
respectively as follows: the load point setJ'Al at the upstream of the A-class isolation
area is respectively taken as the fault rate X'i of the branch line fault component i and the
fault positioning isolation time r'Aunder the automation transfer mode; and the load
point setJ'A2at the downstream of the A-class isolation area is respectively taken as the
fault rate X'i of the branch line fault component i and the transfer time r'tAunder the
automatic transfer mode according to the formula is as follows:
'jji=X'ijEJ'A1(27)
r'j,i-r'AjEJA1 (28)
X'j ijX'i,jEJ'A2 (29)
r'j,i r'tAjEJ'A2 (30);
2) if the main feeder is configured with the B-class isolation area, the parameters
for calculating the reliability of the load point set outside the B-class isolation area are
respectively as follows: the load point setJBi at the upstream of the B-class isolation
area is respectively taken as the fault rate X'i of the branch line fault component i and the
fault positioning isolation time r'Bunder the automation isolation mode; and the load
point setJ'B2at the downstream of the B-class isolation area is respectively taken as the
fault rate X'i of the branch line fault component i and the transfer time r'tBunder the
automatic transfer mode according to the formula is as follows:
X'j,i X'ijEJ'B 1(31)
r'j,i-r'BjEJB1 (32);
X',i='i,jEJ'B2 (33)
r'j,i =r'tB~jEYJB2 (34);
For an unvalued load point set J'rest in the A-class isolation area and the B-class
isolation area,
1) if there is a C-class switch on the branch line, the parameters for calculating the
reliability of the unvalued load point set are respectively taken as the fault rate X'i of the
branch line fault component i and the fault positioning isolation time r'c under the
automation positioning mode according to the formula as follows:
'j,i =X'i,jEJrest (35)
r',i=r'c,jEJ'rest (36);
2) if there is only a D-class switch on the branch line, the parameters for
calculating the reliability of the unvalued load point set are respectively taken as the
fault rate X'i of the branch line fault component i and the fault positioning isolation time
r'Dunder the non-automation mode according to the formula as follows:
'j,i =X'i,jEJrest (37)
r'j,i=r'D,jEJ'rest (38).
Step 4, calculating a reliability index of the target power distribution network
according to reliability parameters in step 2 and step 3.
The specific process of calculating the reliability index includes:
performing fault hypothesis on every component for a target network frame with n
system components and m load points, repeating step 2 or step 3 to determine basic
parameters for calculating the reliability of each load point under the fault condition of
each component; and defining the reliability parameters of the load joint j as an outage rate Xj, fault outage time rj each time and annual average outage time Uj, where j is equal to 1, K, i,
Km.
j is equal to superposition of influences, on the fault rate of the point, of the fault
of each system component according to the formula as follows: n
i (39) rj is equal to superposition of influences, on the outage time of the point, of the
fault of each system component according to the formula as follows:
r= ()r ' s "(40) The annual average power outage time Uj is calculated according to the formula as
follows:
uU =E( 1 x ri (41) The reliability index of the load points can be combined with load point access
user number Nj in basic data to calculate the reliability index of the system as follows:
An average power outage frequency index SAIFI of the system is as follows:
SAIFI = j
(42) A power outage duration index SAIDI of the system is as follows:
:(U x N) SAIDI= ZN 1 IN,
An average power supply available rate index ASAI is as follows:
(U, x N,) 8760 8760-SAIDI ,__ ASAI = 8760 8760 (44) The above is only a preferred embodiment of the present invention. It should be
noted that, for those of ordinary skill in the art, without departing from the principle of
the present invention, several improvements and retouches, which are regarded as the
protection scope of the present invention, further may be made.
Claims (9)
1. A method for calculating power supply reliability of a power distribution
network capable of considering multifunctional power distribution automation
terminals, comprising the following steps:
step 1, determining an automation function mode configured according to the
switch type of a given target power distribution network;
step 2, determining parameters mining for load point reliability calculation under
faults of a main feeder component according to the determined automation function
mode;
step 3, determining parameters adopted for load point reliability calculation under
faults of branch line components according to the determined automation function
mode;
step 4, calculating a reliability index of the target power distribution network
according to reliability parameters step 2 and step 3.
2. The method for calculating the power supply reliability of the power
distribution network capable of considering the multifunctional power distribution
automation terminals according to claim 1, wherein a switch type in step 1 comprises a
A-class switch, a B-class switch, a C-class switch and a D-class switch; the A-class
switch has the shortest positioning isolation time and transfer time corresponding to the
automation transfer mode, the B-class switch has shorter positioning isolation time and
transfer time corresponding to the automation isolation mode, the C-class switch has
longer positioning isolation time and transfer time corresponding to the automation
positioning mode, and the D-class switch has the longest positioning isolation time and
transfer time corresponding to the non-automation mode.
3. The method for calculating the power supply reliability of the power
distribution network capable of considering the multifunctional power distribution
automation terminals according to claim 2, wherein the automation function mode in
step 1 comprises a non-automation mode, an automatic positioning module, an
automatic isolation module and an automatic transfer mode.
4. The method for calculating the power supply reliability of the power
distribution network capable of considering the multifunctional power distribution
automation terminals according to claim 3, wherein the specific process of calculating
reliability parameter of a main feeder in step 2 comprises:
step 2.1, dividing isolation areas according to the switch type given in step 1;
step 2.2, searching the isolation areas from A to D based on automation level
according to the isolation areas divided in step 2.1 when the main feeder component i
has faults until the smallest isolation area in which the fault component i is located is
searched, where reliability of a load point j in different isolation areas is calculated by a
fault rate ki, and fault outage time rj,i, of a corresponding fault component i.
5. The method for calculating the power supply reliability of the power
distribution network capable of considering the multifunctional power distribution
automation terminals according to claim 4, wherein the isolation areas in step 2.1 are
divided by taking a switch as a boundary, and components among switches are
integrated as an area, an area between adjacent switches is called the smallest isolation
area, an area isolated by the A-class switch is called an A-class isolation area, an area
isolated by the B-class switch is called a B-class isolation area, an area isolated by the
C-class switch is called a C-class isolation area, and an area isolated by the D-class
switch is called a D-class isolation area.
6. The method for calculating the power supply reliability of the power
distribution network capable of considering the multifunctional power distribution
automation terminals according to claim 5, wherein the search process in step 2.2 is as
follows:
If the line is configured with the A-class switch and the fault is in the A-class
isolation area, the fault rate and the fault outage time corresponding to the load point set
JAl at the upstream of the A-class isolation area are respectively taken as the fault rate Xi
of the fault component i and the fault positioning isolation time rA under the automation
transfer mode; and the fault rate and fault outage time corresponding to the load point
set JA2 at the downstream of A-class isolation area respectively take the fault rate Xi of
the fault component i and the transfer time rtA under the automatic transfer mode, the
formula is as follows:
Xjji=XijE JAl (I)
rji=rA,jE JA 1(2)
Xj,i=Xi,jEJA2 (3)
rj,i=rtA,jEJA2 (4);
If the line is configured with the B-class switch and the fault is in the B-class
isolation area, the fault rate and the fault outage time corresponding to the load point set
JBl at the upstream of the B-class isolation area are respectively taken as the fault rate Xi
of the fault component i and the fault positioning isolation time rB under the automation
isolation mode; and the fault rate and fault outage time corresponding to the load point
set JB2 at the downstream of B-class isolation area respectively take the fault rate Xi of
the fault component i and the transfer time rtB under the automatic isolation mode
according to the formula as follows:
Xj,i=Xi,jEJB1 (5) rjjirB,jEJB1 (6) jXii,jE JB2 (7); rjjirtB,jEJB2 (8);
If the line is configured with the C-class switch and the fault is in the C-class
isolation area, a load point set in the area between the first encounter switch at the
upstream of the C-class isolation area and the switch (a first-end switch of the line if the
switch with higher automation level is absent) with higher first encounter automation
level at the upstream is Jci, and the fault rate and the fault outage time corresponding to
the load point set are respectively taken as the fault rate Xi of the fault component i and
the fault positioning isolation time rc under the automation positioning mode; a load
point set in the area between the first encounter switch at the downstream of the C-class
isolation area and the switch (a tail-end switch of the line if the switch with higher
automation level is absent) with higher first encounter automation level at the
downstreamis Jc2, and the fault rate and the fault outage time corresponding to the load
point set are respectively taken as the fault rate Xi of the fault component i and the
transfer time rtc under the automation positioning mode according to the formula as
follows:
xj'i =Xi~j EJc (9);
rj,i=rc,jEJci (10)
jj ilijE Jc2 (I11)
rji rtc,jEJc2 (12);
If the line is configured with the D-class switch and the fault is in the D-class
isolation area, a load point set in the area between the first encounter switch at the
upstream of the D-class isolation area and the switch (a first-end switch of the line if the switch with higher automation level is absent) with higher first encounter automation level at the upstream is JD1, and the fault rate and the fault outage time corresponding to the load point set are respectively taken as the fault rate Xi of the fault component i and the fault positioning isolation time rD under the non-automation mode; a load point set in the area between the first encounter switch at the downstream of the D-class isolation area and the switch (a first-end switch of the line if the switch with higher automation level is absent) with higher first encounter automation level at the downstream is JD2, and the fault rate and the fault outage time corresponding to the load point set are respectively taken as the fault rate Xi of the fault component i and the transfer time rtD under the non-automation mode according to the formula as follows: j,i=Xi,jEJD1 (13) rj,i=rD,jEJD1 (14) kj,i=Xi,jEJD2 (15) rj,i=rtD,jEJD2 (16);
The range of the smallest isolation area is continuously reduced from A to D to
finally find the smallest isolation area in which the fault component i is located can be
searched; the load point set in the isolation area is Jf, and the fault rate and the fault
outage time corresponding to the load points when the component has faults are
respectively taken as the fault rate Xi and component repair time ri of the fault
component i according to the formula as follows:
jj ii,jEJf (17)
rj,i ri,jEJf(18).
7. The method for calculating the power supply reliability of the power
distribution network capable of considering the multifunctional power distribution automation terminals according to claim 3, wherein the specific process in step 3 is as follows: step 3.1, for the fault of the system branch line component i, dividing the branch line into a D-class branch isolation area, a C-class branch isolation area and a B-class branch isolation area when a first encounter D-class switch, a first encounter C-class switch and a first encounter B-class switch is at the upstream of the fault component; step 3.2, according to the branch isolation areas divided in step 3.1, searching the isolation areas by taking the smallest isolation area in which the fault component is located as a starting point, and adopting the fault rateX'j,i and the fault outage time r'j,i of the corresponding fault component for calculating reliability of the load points j in different isolation areas.
8. The method for calculating the power supply reliability of the power
distribution network capable of considering the multifunctional power distribution
automation terminals according to claim 7, wherein the specific process in step 3.2 is as
follows:
Parameters for calculating reliability of a load point set J'f in the smallest isolation
area in which the fault component is located and a downstream area thereof are
respectively taken as a fault rate of the branch line fault component i and repair time r'i
of the component according to the formula as follows:
'jji= X'i,jEJ'f (19)
r'j,i=r'i,jEJ'f (20);
For the D-class branch isolation area, parameters for calculating reliability of a
load point set J'D1 in the switch area with higher first encounter automation level of the
first encounter switch at the upstream are respectively taken as a fault rate Xli of the branch line fault component i and fault position isolation time r'D under the non-automation mode according to the formula as follows:
X'j,i=X'ijEJ'D1 (21)
r'j,i=r'D,jEYD1 (22);
For the C-class branch isolation area, parameters for calculating reliability of a
load point set J'ci in the switch area with higher first encounter automation level of the
first encounter switch at the upstream are respectively taken as a fault rate X'i of the
branch line fault component i and fault position isolation time r'c under the
non-automation mode according to the formula as follows:
'jji=X'ijEJ'ci (23)
r'j,i=r'c,jEJ'ci (24);
For the B-class branch isolation area, parameters for calculating reliability of a
load point set J'B Ioutside the B-class branch isolation area are respectively taken as a
fault rate X'i of the branch line fault component i and fault position isolation time r'B
under the automation isolation mode according to the formula as follows:
X'j,i X'i,jEJ'B1 (25)
r'j,i r'B~jEY T 1 (26);
If there is no B-class switch on the upstream of branch line, the fault of the branch
line component will cause power outage of a main feeder section accessed into the
branch line;
1) if the main feeder is configured with the A-class isolation area, the parameters
for calculating the reliability of the load point set outside the A-class isolation area are
respectively as follows: the load point setJ'Al at the upstream of the A-class isolation
area is respectively taken as the fault rate X'i of the branch line fault component i and the
fault positioning isolation time r'Aunder the automation transfer mode; and the load point set J'A2 at the downstream of the A-class isolation area is respectively taken as the fault rate X'i of the branch line fault component i and the transfer time r'tA under the automatic transfer mode according to the formula is as follows:
'jji=X'ijEJ'A (27)
r'ji=r'AjEYA1 (28)
X'j i=X'ijEJ'A2 (29)
r'j,i=r'tA,jEJ'A2 (30);
2) if the main feeder is configured with the B-class isolation area, the parameters
for calculating the reliability of the load point set outside the B-class isolation area are
respectively as follows: the load point set J'B at the upstream of the B-class isolation
area is respectively taken as the fault rate X'i of the branch line fault component i and the
fault positioning isolation time r'B under the automation isolation mode; and the load
point set J'B2 at the downstream of the B-class isolation area is respectively taken as the
fault rate X'i of the branch line fault component i and the transfer time r'tB under the
automatic transfer mode according to the formula is as follows:
X'j,i=X'i,jEJ'Bl (31)
r'j,i=r'B,jE B l (32);
X,i=X'i,jEJ'B2 (33)
r'j,i=r'tB,jEJ'B2 (34);
For an unvalued load point set J'rest in the A-class isolation area and the B-class
isolation area,
1) if there is a C-class switch on the branch line, the parameters for calculating the
reliability of the unvalued load point set are respectively taken as the fault rate X'i of the branch line fault component i and the fault positioning isolation time r'c under the automation positioning mode according to the formula as follows: k'j i=',jE J'rest (35) r'j,i=r'c,jEJ'rest (36);
2) if there is only a D-class switch on the branch line, the parameters for
calculating the reliability of the unvalued load point set are respectively taken as the
fault rate ' of the branch line fault component i and the fault positioning isolation time
r'Dunder the non-automation mode according to the formula as follows:
'j i=',jE Jrest (37)
r'j,i=r'D,jEJ'rest (38).
9. The method for calculating the power supply reliability of the power
distribution network capable of considering the multifunctional power distribution
automation terminals according to claim 4, wherein the specific process of calculating a
reliability value in step 4 is as follows:
performing fault hypothesis on every component for a target network frame with n
system components and m load points, repeating step 2 or step 3 to determine basic
parameters for calculating the reliability of each load point under the fault condition of
each component,
defining the reliability parameters of the load joint j as an outage rate )j, fault
outage time rj each time and annual average outage time Uj, wherein j is equal to 1, K, i,
Km, 2 is equal to superposition of influences, on the fault rate of the point, of the fault
of each system component according to the formula as follows:
(39) rj is equal to superposition of influences, on the outage time of the point, of the fault of each system component according to the formula as follows:
(40) the annual average power outage time Uj is calculated according to the formula as
follows:
i(41) the reliability index of the load points can be combined with load point access user
number Nj in basic data to calculate the reliability index of the system as follows:
an average power outage frequency index SAIFI of the system is as follows:
jE( xN )
SAIFI = 7,NJ (42) a power outage duration index SAIDI of the system is as follows:
I(U, x N,) SAIDI =' ') (43) an average power supply available rate index ASAI is as follows:
8760 - j
ASAI =8760-SAIDI . N 8760 8760 (44)
wherein SAIDI is average power outage duration index of the system.
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