CN109378815B - Power distribution network closed loop switching power supply control method, device and equipment - Google Patents
Power distribution network closed loop switching power supply control method, device and equipment Download PDFInfo
- Publication number
- CN109378815B CN109378815B CN201810744693.3A CN201810744693A CN109378815B CN 109378815 B CN109378815 B CN 109378815B CN 201810744693 A CN201810744693 A CN 201810744693A CN 109378815 B CN109378815 B CN 109378815B
- Authority
- CN
- China
- Prior art keywords
- power supply
- loop
- loop closing
- closed
- closing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000012546 transfer Methods 0.000 claims abstract description 179
- 238000004590 computer program Methods 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 5
- 238000012797 qualification Methods 0.000 claims description 5
- 238000012163 sequencing technique Methods 0.000 claims description 5
- 230000001960 triggered effect Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Images
Classifications
-
- 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
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a power distribution network closed loop transfer power supply control method, which comprises the following steps of firstly, acquiring all closed loop transfer power supply paths in a power distribution network and contact switches corresponding to the closed loop transfer power supply paths; and then determining a loop closing transfer power supply path of which the loop closing flow does not exceed the threshold value after loop closing according to each interconnection switch, and deleting the loop closing transfer power supply path of which the loop closing flow exceeds the threshold value after loop closing. Therefore, when the distribution network is overhauled or the system fails, the switching power supply and loop closing operation can be directly realized according to the determined loop closing switching power supply path of which the loop closing tide cannot exceed the threshold value after loop closing, so that the protection tripping caused by overload of a circuit or equipment due to overlarge loop closing tide after loop closing is avoided, the operation mode of first power failure and then power supply switching is not required, the power failure times are reduced, and the power supply reliability of a user is improved. In addition, the invention also discloses a power distribution network closed loop switching power supply control device and equipment, and the effect is as above.
Description
Technical Field
The invention relates to the technical field of power engineering, in particular to a power distribution network loop closing transfer power supply control method, device and equipment.
Background
At present, the urban 10kV distribution network in China generally adopts a ring network design and an open-loop operation mode. With the development of urban power distribution networks in recent years, most 10kV lines have a rotatable power supply capacity, and even a plurality of 10kV lines have a rotatable power supply capacity. Namely, when the distribution network is overhauled or the system has a fault, load transfer can be realized through loop closing operation, and power failure of a user is avoided. In view of this, most of China adopts the operation mode of first power failure and then power supply, namely, when the distribution network is overhauled or the system is in fault, the power failure is firstly carried out, the distribution network is overhauled or the system is solved and then the original power supply operation mode is recovered, but the operation mode can lead to the increase of the power failure times of users and the lengthening of the power failure time, and the reliable power utilization of the users is seriously influenced.
Therefore, the technical staff in the field needs to solve the problems of more power failure times, long power failure time and low power supply reliability of users when the line is overhauled and unloaded.
Disclosure of Invention
The embodiment of the application provides a power distribution network loop closing transfer power supply control method, device and equipment, and aims to solve the problems that in the prior art, during line repair and load shedding, the power failure times are large, the power failure time is long, and the power supply reliability of users is low.
In order to solve the technical problem, the invention provides a power distribution network loop closing transfer power supply control method, which comprises the following steps:
acquiring all loop closing transfer power supply paths in a power distribution network and interconnection switches corresponding to the loop closing transfer power supply paths;
judging whether the loop closing power flow exceeds a threshold value after the loop closing of each loop closing transfer power supply path according to each interconnection switch;
if so, deleting the loop closing transfer power supply path of which the loop closing flow exceeds the threshold value after loop closing;
if not, recording a loop closing transfer power supply path of which the loop closing flow does not exceed the threshold value after loop closing.
Preferably, the determining, according to each interconnection switch, whether a loop closing power flow after the loop closing of each loop closing transfer power supply path exceeds a threshold specifically includes:
judging whether a tripping signal of the power distribution network is received or not after each corresponding interconnection switch in each closed loop power supply switching path is closed;
if so, representing that the loop closing tide current after the corresponding loop closing transfer power supply path is closed exceeds a threshold value;
and if not, representing that the loop closing power flow after the corresponding loop closing transfer power supply path is subjected to loop closing does not exceed a threshold value.
Preferably, the determining, according to each interconnection switch, whether a loop closing power flow after loop closing of each loop closing transfer power supply path exceeds a threshold further includes:
and judging whether the loop closing power flow after the loop closing transfer power supply path is closed exceeds a threshold value according to the information of the power supply sheet areas on the two sides of each interconnection switch.
Preferably, the determining, according to the information of the power supply area on the two sides of each interconnection switch, whether the loop closing power flow after the loop closing transfer power supply path is closed exceeds a threshold specifically includes:
taking a high-voltage side bus of the transformer substation in the power supply area as a power supply point;
judging whether power supply points on two sides of each corresponding interconnection switch in each closed loop power supply switching path are the same or not;
if so, representing that the loop closing power flow after the corresponding loop closing transfer power supply path is closed does not exceed a threshold value;
if not, the closed loop tidal current after the closed loop switching power supply path is characterized to exceed a threshold value.
Preferably, after determining that the closed-loop power flow does not exceed the closed-loop power transfer path of the threshold value, the method further includes:
judging whether a target interconnection switch corresponding to the loop closing transfer power supply path of which the loop closing power flow does not exceed the threshold value after loop closing has loop closing conditions;
if not, deleting a target loop closing transfer power supply path corresponding to the target contact switch without the loop closing condition;
and if so, recording a target closed loop switching power supply path corresponding to the target communication switch with the closed loop condition.
Preferably, the determining whether a target interconnection switch corresponding to the closed-loop power supply transfer path whose closed-loop power flow does not exceed the threshold has the closed-loop condition specifically includes:
calculating loop closing impact current and loop closing load flow of the target interconnection switch;
judging whether the loop closing impact current and the loop closing current of the target interconnection switch exceed threshold values or not;
if yes, representing that the corresponding target interconnection switch does not have a loop closing condition;
if not, representing that the corresponding target interconnection switch has a loop closing condition.
Preferably, after the recording of the target closed-loop switching power supply path corresponding to the target interconnection switch having the closed-loop condition, the method further includes:
and determining an optimal closed-loop power transfer path in each target closed-loop power transfer path, and determining the operation sequence of each target interconnection switch in the optimal closed-loop power transfer path.
Preferably, the determining an optimal loop-closing transfer power supply path in each of the target loop-closing transfer power supply paths specifically includes:
determining the network loss rate, the voltage qualification rate, the load balance degree and the maximum load rate of the power distribution network after the target loop closing transfer power supply paths are closed;
calculating the weight of each target closed-loop power supply switching path according to the network loss rate, the voltage qualified rate, the load balance degree and the maximum load rate;
and performing optimization sequencing on each target closed-loop power supply switching path according to the weight to determine the optimal closed-loop power supply switching path.
In order to solve the technical problem, the invention also provides a device corresponding to the power distribution network loop closing transfer power supply control method, which comprises the following steps:
the acquisition module is used for acquiring all loop closing transfer power supply paths in the power distribution network and the interconnection switches corresponding to the loop closing transfer power supply paths;
the judging module is used for judging whether the loop closing power flow after the loop closing transfer power supply paths are closed exceeds a threshold value according to the interconnection switches, if so, the deleting module is triggered, and if not, the recording module is triggered;
the deleting module is used for deleting a loop closing switching power supply path of which the loop closing power flow exceeds a threshold value after loop closing;
and the recording module is used for recording the loop closing transfer power supply path of which the loop closing flow does not exceed the threshold value after loop closing.
In order to solve the technical problem, the invention also provides a device corresponding to the power distribution network loop closing transfer power supply control method, which comprises the following steps:
a memory for storing a computer program;
and the processor is used for executing the computer program to realize the steps of any one of the power distribution network closed loop switching power supply control methods.
Compared with the prior art, the power distribution network closed-loop power supply transfer control method provided by the invention comprises the steps of firstly obtaining all closed-loop power supply transfer paths in the power distribution network and the contact switches corresponding to the closed-loop power supply transfer paths; and then determining a loop closing transfer power supply path of which the loop closing flow does not exceed the threshold value after loop closing according to each interconnection switch, and deleting the loop closing transfer power supply path of which the loop closing flow exceeds the threshold value after loop closing. Therefore, when the distribution network is overhauled or the system fails, the switching power supply and loop closing operation can be directly realized according to the determined loop closing switching power supply path of which the loop closing tide cannot exceed the threshold value after loop closing, so that the protection tripping caused by overload of a circuit or equipment due to overlarge loop closing tide after loop closing is avoided, the operation mode of first power failure and then power supply switching is not required, the power failure times are reduced, and the power supply reliability of a user is improved. In addition, the invention also provides a power distribution network closed loop switching power supply control device and equipment, and the effect is as above.
Drawings
Fig. 1 is a flowchart of a power distribution network loop closing transfer power supply control method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power distribution network according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a power distribution network loop closing transfer power supply control apparatus according to an embodiment of the present invention;
fig. 4 is a schematic composition diagram of a power distribution network loop closing transfer power supply control device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The core of the invention is to provide a power distribution network closed loop switching power supply control method, a device and equipment, which can solve the problems of more power failure times, long power failure time and low power supply reliability of users during line repair and load shedding in the prior art.
In order that those skilled in the art will better understand the concept of the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Fig. 1 is a flowchart of a power distribution network loop closing transfer power supply control method according to an embodiment of the present invention, and as shown in fig. 1, the control method includes:
s101: and acquiring all loop closing transfer power supply paths in the power distribution network and the interconnection switches corresponding to the loop closing transfer power supply paths.
Specifically, all loop closing transfer power supply paths in the power distribution network are obtained, wherein the loop closing transfer power supply paths comprise effective loop closing transfer power supply paths, ineffective loop closing transfer power supply paths and interconnection switches corresponding to all the obtained loop closing transfer power supply paths. In practical application, the loop-closing switching power supply path should include a power supply bus with a high voltage level.
S102: and judging whether the loop closing power flow after the loop closing of each loop closing transfer power supply path exceeds a threshold value according to each interconnection switch, if so, entering a step S103, and if not, entering a step S104.
S103: and deleting the closed loop switching power supply path with the closed loop power flow exceeding the threshold value after the closed loop is closed.
S104: and recording a loop closing transfer power supply path of which the loop closing flow does not exceed a threshold value after loop closing.
After all loop closing transfer power supply paths and corresponding interconnection switches in the power distribution network are obtained, whether loop closing power flow of the corresponding loop closing transfer power supply paths exceeds a threshold value after loop closing is judged according to the interconnection switches; that is, it is determined which loop-closing transfer power paths are valid loop-closing transfer power paths and which are invalid loop-closing transfer power paths. When the closed loop power flow exceeds the threshold value after the closed loop power supply switching path is determined, deleting the corresponding closed loop power supply switching path of which the closed loop power flow exceeds the threshold value; and when the closed loop power flow does not exceed the threshold value after the closed loop power supply switching path is determined, recording the corresponding closed loop power supply switching path of which the closed loop power flow does not exceed the threshold value after the closed loop power supply switching path is closed. When the power distribution network is overhauled or failed next time, the determined closed-loop power flow after the closed loop does not exceed the threshold value is directly utilized to carry out closed-loop power transfer and supply operation, so that the power failure times can be reduced, and the power supply reliability of a user is improved. The threshold value is set in advance according to actual conditions.
As a preferred embodiment, step S102 specifically includes:
judging whether a tripping signal of the power distribution network is received or not after the corresponding contact switches in the closed loop power supply transfer paths are closed;
if yes, representing that the loop closing tide current after the corresponding loop closing transfer power supply path is closed exceeds a threshold value;
and if not, representing that the loop closing current does not exceed the threshold value after the corresponding loop closing transfer power supply path is closed.
Specifically, the topological load flow of the power distribution network is calculated by closing the interconnection switch, whether the power distribution network system has out-of-limit tripping or not is judged according to the protection action analysis performed by the calculation result and the protection configuration, and the obtained closed-loop power supply transfer paths are analyzed one by one. If the tripping signal of the power distribution network is received after the corresponding contact switches in the closed loop transfer power supply paths are closed, it is described that the closed loop tide current after the closed loop transfer power supply paths are closed exceeds the threshold, and then the step S103 is executed; if the tripping signal of the power distribution network is not received after the corresponding contact switches in the closed loop transfer power supply paths are closed, it indicates that the closed loop power flow after the corresponding closed loop transfer power supply paths are closed does not exceed the threshold, and then step S104 is executed. In fact, all valid closed-loop transfer power supply paths (closed-loop transfer power supply paths whose closed-loop power flow does not exceed the threshold value after closed-loop) are reserved and recorded, and all invalid closed-loop transfer power supply paths (closed-loop transfer power supply paths whose closed-loop power flow exceeds the threshold value after closed-loop) are deleted.
In order to improve the accuracy, on the basis of the above embodiment, as a preferable implementation manner, after determining the loop closing transfer power path whose loop closing power flow does not exceed the threshold value after the loop closing, the method further includes:
judging whether a target interconnection switch corresponding to a loop closing transfer power supply path of which the loop closing flow does not exceed a threshold value after loop closing has loop closing conditions;
if not, deleting a target loop closing transfer power supply path corresponding to the target contact switch without the loop closing condition;
if yes, recording a target closed loop transfer power supply path corresponding to the target communication switch with the closed loop condition.
Specifically, after each corresponding contact switch in each closed loop transfer power supply path is closed, a tripping signal of the power distribution network is received, and then a closed loop transfer power supply path of which the closed loop power flow does not exceed a threshold value is determined, whether a target contact switch corresponding to the closed loop transfer power supply path of which the closed loop power flow does not exceed the threshold value has a closed loop condition or not is judged, and if the target contact switch meets the condition, the target closed loop transfer power supply path corresponding to the target contact switch with the closed loop condition is recorded; and if the condition is not met, deleting the target closed loop transfer power supply path corresponding to the target communication switch without the closed loop condition.
On the basis of the above embodiment, as a preferable implementation, the step S102 further includes:
and judging whether the loop closing power flow exceeds a threshold value after the loop closing transfer power supply path is closed according to the information of the power supply sheet areas on the two sides of each interconnection switch.
After judging whether the closed-loop power flow exceeds the threshold value after the closed-loop power supply switching path is closed according to whether a tripping signal of the power distribution network is received or not, on the basis, judging whether the closed-loop power flow exceeds the threshold value after the closed-loop power supply switching path is closed according to the information of the power supply sheet areas on the two sides of each interconnection switch.
In the prior art, a power system 10kV distribution network generally adopts a ring network design and open-loop operation mode. Most 10kV lines have rotatable power supply capacity, namely, when distribution network maintenance or system faults occur, load transfer can be achieved through loop closing operation, and power failure of users is avoided. Because the feasibility of the loop closing operation is difficult to judge at present, the problem that the loop closing trend is overlarge after the loop closing operation is closed, and the power failure of a user in a larger range is caused due to overload of a circuit or equipment and even tripping protection is caused is solved. The control method provided by the embodiment of the application analyzes the effective load transfer power supply path of the power supply equipment of the power distribution network in advance, finally determines the loop closing transfer power supply path of which the loop closing trend does not exceed the threshold value after loop closing, and can directly select the determined loop closing transfer power supply path of which the loop closing trend does not exceed the threshold value for use by the power distribution system when the power distribution network needs to be overhauled or failed and the loop closing transfer power supply is needed, so that the power failure times are reduced, and the power utilization reliability of a user is improved.
The invention provides a power distribution network closed loop transfer power supply control method, which comprises the following steps of firstly, acquiring all closed loop transfer power supply paths in a power distribution network and contact switches corresponding to the closed loop transfer power supply paths; and then determining a loop closing transfer power supply path of which the loop closing flow does not exceed the threshold value after loop closing according to each interconnection switch, and deleting the loop closing transfer power supply path of which the loop closing flow exceeds the threshold value after loop closing. Therefore, when the distribution network is overhauled or the system fails, the switching power supply and loop closing operation can be directly realized according to the determined loop closing switching power supply path of which the loop closing tide cannot exceed the threshold value after loop closing, so that the protection tripping caused by overload of a circuit or equipment due to overlarge loop closing tide after loop closing is avoided, the operation mode of first power failure and then power supply switching is not required, the power failure times are reduced, and the power supply reliability of a user is improved.
On the basis of the foregoing embodiment, as a preferred implementation manner, the determining, according to the information of the power supply patch areas on both sides of each interconnection switch, whether the loop closing power flow after the loop closing of the corresponding loop closing transfer power supply path exceeds the threshold specifically includes:
taking a high-voltage side bus of a transformer substation in a power supply area as a power supply point;
judging whether power supply points on two sides of each corresponding interconnection switch in each closed loop power supply switching path are the same or not;
if so, representing that the loop closing power flow does not exceed a threshold value after the corresponding loop closing transfer circuit is closed;
if not, the closed loop tidal current after the corresponding closed loop switching power supply path is characterized to be closed is beyond a threshold value.
Specifically, a high-voltage side bus of a power supply block area substation is used as a power supply point, power supply tracing is respectively carried out from two sides of a loop closing point switch, if the extracted power supply points on two sides of each interconnection switch are the same, it is indicated that two sides of the loop closing point switch belong to the same power supply block area, and a loop closing tide after a corresponding loop closing transfer power supply path is closed does not exceed a threshold, otherwise, it is indicated that two sides of the loop closing point switch belong to different power supply block areas, and a loop closing tide after the corresponding loop closing transfer power supply path is closed exceeds the threshold. Judging whether the power supply points on the two sides of each corresponding interconnection switch in each closed loop transfer power supply path are the same or not, namely judging whether the power supply points on the two sides of each corresponding interconnection switch in each closed loop transfer power supply path are the same or not; for example, if there are 5 closed-loop transfer power supply paths, it is determined whether the power supply points on both sides of each corresponding interconnection switch in the 5 closed-loop transfer power supply paths are the same, and a closed-loop transfer power supply path whose closed-loop power flow does not exceed the threshold value after closed-loop is determined.
In addition to the above embodiments, as a preferable implementation, the determining whether the target interconnection switch corresponding to the closed-loop transfer power supply path whose closed-loop power flow does not exceed the threshold has the closed-loop condition specifically includes:
calculating loop closing impact current and loop closing load flow of the target interconnection switch;
judging whether the loop closing impact current and the loop closing current of the target interconnection switch exceed threshold values or not;
if so, representing that the corresponding target interconnection switch does not have a loop closing condition;
if not, representing that the corresponding target connection switch has a loop closing condition.
Specifically, first, the loop closing impact current of the target tie switch is calculated. And calculating a node voltage phase angle and port impedance before loop closing according to a state estimation method, and calculating loop closing circuit impedance according to topology analysis so as to calculate loop closing steady-state current, loop closing impact current and impact current time domain characteristics. The loop can be equivalent to a first-order RL series circuit in the loop closing process, and the calculation process of the loop closing impact current can be regarded as zero-state response of the first-order RL series circuit under the condition of sinusoidal input.
And secondly, calculating the loop closing load flow of the target interconnection switch. And (3) enabling the closed-loop steady-state current to be equivalent to the injection power change of the logic buses at two ends of the closed-loop branch, and obtaining the steady-state closed-loop power flow by using a weak loop compensation method of power distribution network power flow calculation. The method is based on a compensation principle, a weak looped network is equivalent to a radiation network, and then the trend of the equivalent radiation network is calculated by a forward-backward substitution method. The specific calculation process is as follows: firstly, splitting a ring network, determining a breakpoint impedance matrix, and setting an initial value of a breakpoint current; then, according to the current breakpoint injection current, applying a load flow calculation method to obtain a breakpoint open-circuit voltage; and finally, correcting the breakpoint current by using the breakpoint open-circuit voltage, judging whether convergence occurs or not, outputting the loop closing current of the corresponding target interconnection switch if convergence occurs, and iterating and calculating until convergence occurs if convergence does not occur, so as to obtain the loop closing current of the target interconnection switch.
Thirdly, judging whether the loop closing impact current and the loop closing power flow exceed threshold values; and further determining whether the corresponding target interconnection switch has a loop closing condition. The threshold is set in advance, and the specific setting is suitable, which can be determined according to the actual situation, and the invention is not limited.
In addition to the above-mentioned embodiments, as a preferred embodiment, after recording the target closed-loop transfer power supply path corresponding to the target interconnection switch having the closed-loop condition, the method further includes:
and determining an optimal closed-loop power supply transferring path in each target closed-loop power supply transferring path, and determining the operation sequence of each target interconnection switch in the optimal closed-loop power supply transferring path.
After the target closed-loop power supply transfer path is determined, the optimal closed-loop power supply transfer path and the operation sequence of each target interconnection switch in the optimal closed-loop power supply transfer path are determined. And when the next power distribution network is overhauled or has faults, the determined optimal loop closing transfer power supply path and the optimal target connection switch operation sequence are directly utilized to carry out loop closing transfer power supply. In practical application, besides determining the optimal closed-loop power supply transfer path from all the target closed-loop power supply transfer paths, the sequence of the closed-loop power supply transfer paths during power distribution network maintenance or fault closed-loop power supply transfer can be determined, that is, the optimal closed-loop power supply transfer path is executed first, when the optimal closed-loop power supply transfer path is not communicated in case of accident, the suboptimal closed-loop power supply transfer path is executed again, and the like until all the target closed-loop power supply transfer paths are executed.
On the basis of the foregoing embodiment, as a preferred implementation manner, the determining an optimal loop transfer power path in each first target loop transfer power path specifically includes:
determining the network loss rate, the voltage qualification rate, the load balance degree and the maximum load rate of the power distribution network after each target loop closing transfer power supply path is closed;
calculating the weight of each target closed-loop power supply switching path according to the network loss rate, the voltage qualification rate, the load balance degree and the maximum load rate;
and performing optimization sequencing on each target closed-loop transfer power supply path according to the weight to determine an optimal closed-loop transfer power supply path.
Specifically, the switching power supply operation analysis is carried out on all the closed loop conditions and the effective closed loop switching power supply paths. And determining the weight of each target closed-loop power supply switching path through load flow calculation after power switching, checking the loss rate, the voltage qualification rate, the load balance degree and the maximum load rate of the network and combining different simulation protection action tests, and finally performing optimization sequencing on each target closed-loop power supply switching path according to the weight to determine the optimal closed-loop power supply switching path.
In order to better understand the technical scheme of the present invention, the technical scheme of the present invention is further described below with reference to an actual application scenario, fig. 2 is a schematic diagram of a power distribution network line provided in an embodiment of the present invention, as shown in fig. 2, two power supply piece areas are formed by a 220kV substation 1 and a 220kV substation 2, a 110kV substation 10 and a 110kV substation 11 are connected to the 220kV substation 1, a 110kV substation 20 is connected to the 220kV substation 2, S1, S2, S3, and S4 are feeder switches, lines in which feeder switches S1, S2, S3, and S4 are located are called feeders, four feeders form a feeder group capable of mutually transferring power, the operating states of the feeder switches S1, S2, S3, and S4 are closed-closed states, the operating states of the feeder switches K1, K2, and K3 are all switches, and the operating states of the K1, K2, and K3 are open-closed states. The following explains the present solution by taking loop closing switching power supply analysis of the feeder switch S1 as an example, and the specific steps are as follows:
firstly, searching a payload transfer loop power supply path: through analysis of a load loop closing transfer power supply path, supposing that a loop closing transfer power supply path is integrated into { (110kV transformer substation 10 high-voltage bus-S1-K1-S2-110 kV transformer substation 11 high-voltage bus), (110kV transformer substation 11 high-voltage bus-S1-K2-S3-110 kV transformer substation 11 high-voltage bus), (110kV transformer substation 11 high-voltage bus-S1-K3-S4-110 kV transformer substation 20 high-voltage bus) };
secondly, searching for an interconnection switch corresponding to the closed-loop power supply switching path to obtain a set of the interconnection switches for closed-loop power supply switching, wherein the set of the interconnection switches is { K1, K2, K3 };
thirdly, calculating corresponding loop closing impact currents of the interconnection switches, and calculating loop closing impact currents of the interconnection switches { K1, K2 and K3} respectively;
fourthly, calculating the load flow after the loop closing of the corresponding interconnection switches, and respectively calculating the load flow after the loop closing of the interconnection switches { K1, K2, K3 };
and fifthly, judging whether the corresponding interconnection switch has a loop closing condition or not, and analyzing loop closing power supply paths of the interconnection switches K1, K2 and K3, wherein the two sides of K3 belong to different power supply sheet areas, so that the loop closing operation is not allowed, and therefore the interconnection switch set for switching the power supply operation is further screened as { K1, K2 }. Meanwhile, whether the { K1, K2} has a loop closing condition is judged according to the loop closing impact current and the loop closing tide of the interconnection switch { K1, K2 };
sixthly, determining an optimal closed-loop power supply transferring path, assuming that interconnection switches (K1 and K2) have closed-loop conditions, respectively performing load flow calculation after simulation closed-loop power supply transferring on the closed-loop power supply transferring path { (110kV transformer substation 10 high-voltage bus-S1-K1-S2-110 kV transformer substation 11 high-voltage bus), (110kV transformer substation 11 high-voltage bus-S1-K2-S3-110 kV transformer substation 11 high-voltage bus) }, and performing closed-loop power supply transferring path optimization sequencing;
seventh, determining a sequence of sequential control operation of the interconnection switch in the optimal closed loop power supply switching path: assuming that indexes of a path { (110kV transformer substation 10 high-voltage bus-S1-K1-S2-110 kV transformer substation 11 high-voltage bus) } are better after K1 is supplied with power, the operation set of the closed-loop power-supply interconnection switch is { K1 }. Thus, the optimal sequential control split-loop operation sequence is shown in table 1:
TABLE 1 switching sequence in optimized Loop-closing switched Power Path
| Serial number | Switch with a switch body | Operation of |
| 1 | K1 | Closing switch |
| 2 | S1 | Separating brake |
The above embodiment of the power distribution network loop closing transfer power supply control method is described in detail, and based on the power distribution network loop closing transfer power supply control method described in the above embodiment, the embodiment of the present invention further provides a device corresponding to the method. Since the embodiment of the apparatus portion and the embodiment of the method portion correspond to each other, the embodiment of the apparatus portion is described with reference to the embodiment of the method portion, and is not described again here.
Fig. 3 is a schematic diagram illustrating a power distribution network closed loop switching power supply control apparatus according to an embodiment of the present invention, and as shown in fig. 3, the apparatus includes an obtaining module 301, a determining module 302, a deleting module 303, and a recording module 304.
An obtaining module 301, configured to obtain all closed-loop power transfer paths in the power distribution network and interconnection switches corresponding to the closed-loop power transfer paths;
the judging module 302 is configured to judge whether a loop closing power flow after loop closing of each loop closing transfer power supply path exceeds a threshold according to each interconnection switch, if so, trigger the deleting module 303, and if not, trigger the recording module 304;
a deleting module 303, configured to delete a loop closing switching power supply path of which a loop closing power flow exceeds a threshold after loop closing;
and the recording module 304 is configured to record a loop closing transfer power supply path after loop closing, where the loop closing power flow does not exceed a threshold.
The invention provides a power distribution network closed-loop power transfer control device, which comprises the following steps of firstly, acquiring all closed-loop power transfer paths in a power distribution network and contact switches corresponding to the closed-loop power transfer paths; and then determining a loop closing transfer power supply path of which the loop closing flow does not exceed the threshold value after loop closing according to each interconnection switch, and deleting the loop closing transfer power supply path of which the loop closing flow exceeds the threshold value after loop closing. Therefore, when the distribution network is overhauled or a system has a fault, the control device can directly realize the switching power supply and loop closing operation according to the determined loop closing switching power supply path of which the loop closing tide can not exceed the threshold value after loop closing, so that the protection tripping caused by overload of a circuit or equipment due to overlarge loop closing tide can not be caused after the loop closing, and the operation mode of first power failure and then switching power supply does not need to be adopted, so that the power failure times are reduced, and the power supply reliability of a user is improved.
The above embodiment of the power distribution network loop closing transfer power supply control method is described in detail, and based on the power distribution network loop closing transfer power supply control method described in the above embodiment, the embodiment of the present invention further provides a device corresponding to the method. Since the embodiment of the device part and the embodiment of the method part correspond to each other, the embodiment of the device part is described with reference to the embodiment of the method part, and is not described again here.
Fig. 4 is a schematic diagram illustrating a power distribution network loop-closing switching power supply control apparatus according to an embodiment of the present invention, as shown in fig. 4, the apparatus includes a memory 401 and a processor 402.
A memory 401 for storing a computer program;
the processor 402 is configured to execute a computer program to implement the steps of the power distribution network closed loop transfer power control method provided in any one of the above embodiments.
According to the distribution network loop closing and power supply switching control equipment, when a distribution network is overhauled or a system fails, switching power supply loop closing operation can be directly realized according to the determined loop closing and power supply switching path of which the loop closing load flow after loop closing does not exceed the threshold, so that protection tripping caused by overload of a line or equipment due to overlarge loop closing load flow after loop closing is avoided, an operation mode of power failure before power supply is adopted is not needed, the power failure frequency is reduced, and the power supply reliability of a user is improved.
The method, the device and the equipment for controlling the closed-loop switching power supply of the power distribution network provided by the invention are described in detail above. The principles and embodiments of the present invention have been described herein using several examples, the above description of which is only intended to facilitate the understanding of the method and its core concepts of the present invention; meanwhile, for those skilled in the art, based on the idea of the present invention, there may be variations in the specific embodiments and applications, and in summary, the present disclosure should not be construed as a limitation of the present invention, and those skilled in the art should include modifications, equivalent substitutions, improvements and the like without inventive labor.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Furthermore, the term "comprises/comprising" and the like, such that a unit, device or system comprising a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such unit, device or system.
Claims (4)
1. A power distribution network closed loop transfer power supply control method is characterized by comprising the following steps:
acquiring all loop closing transfer power supply paths in a power distribution network and interconnection switches corresponding to the loop closing transfer power supply paths;
judging whether the loop closing power flow exceeds a threshold value after the loop closing of each loop closing transfer power supply path according to each interconnection switch;
if so, deleting the loop closing transfer power supply path of which the loop closing flow exceeds the threshold value after loop closing;
if not, recording a loop closing transfer power supply path of which the loop closing flow does not exceed a threshold value after loop closing;
the step of judging whether the loop closing power flow after the loop closing of each loop closing transfer power supply path exceeds a threshold value according to each interconnection switch specifically comprises the following steps:
judging whether a tripping signal of the power distribution network is received or not after each corresponding contact switch in each closed-loop power transfer path is closed;
if so, representing that the loop closing tide current after the corresponding loop closing transfer power supply path is closed exceeds a threshold value;
if not, representing that the loop closing power flow after the corresponding loop closing transfer power supply path is closed does not exceed a threshold;
after determining that the closed loop power flow after closed loop does not exceed the closed loop power transfer path of the threshold value, the method further comprises the following steps:
when each corresponding contact switch in each closed-loop power supply transfer path is closed, a tripping signal of the power distribution network is received, and then after the closed-loop power supply transfer path of which the closed-loop power flow does not exceed the threshold value is determined, whether a target contact switch corresponding to the closed-loop power supply transfer path of which the closed-loop power flow does not exceed the threshold value has a closed-loop condition or not is judged, and if the target contact switch meets the condition, the target closed-loop power supply transfer path corresponding to the target contact switch with the closed-loop condition is recorded; if the target does not meet the condition, deleting the target loop closing transfer power supply path corresponding to the target contact switch without the loop closing condition;
the step of judging whether the loop closing power flow after the loop closing of each loop closing transfer power supply path exceeds a threshold value according to each interconnection switch further comprises the following steps:
judging whether the loop closing power flow of the corresponding loop closing transfer power supply path after loop closing exceeds a threshold value according to the information of the power supply sheet areas on the two sides of each interconnection switch;
the step of judging whether the loop closing power flow after the loop closing transfer power supply path is closed exceeds a threshold value according to the information of the power supply area on the two sides of each interconnection switch specifically comprises the following steps:
taking a high-voltage side bus of the power supply block transformer substation as a power supply point, respectively tracing power supplies from two sides of a loop closing point switch, if the extracted power supply points on two sides of each interconnection switch are the same, indicating that the two sides of the loop closing point switch belong to the same power supply block, and the loop closing trend of a corresponding loop closing transfer power supply path after loop closing does not exceed a threshold value, otherwise indicating that the two sides of the loop closing point switch belong to different power supply block areas, and the loop closing trend of the corresponding loop closing transfer power supply path after loop closing exceeds the threshold value, and judging whether the power supply points on two sides of each corresponding interconnection switch in each loop closing transfer power supply path are the same or not, namely judging whether the power supply points on two sides of each corresponding interconnection switch in each loop closing transfer power supply path are the same or not;
after the recording of the target closed-loop transfer power supply path corresponding to the target interconnection switch having the closed-loop condition, the method further includes:
determining an optimal closed-loop power supply transferring path in each target closed-loop power supply transferring path, and determining an operation sequence of each target interconnection switch in the optimal closed-loop power supply transferring path;
the determining an optimal loop closing transfer power supply path in each target loop closing transfer power supply path specifically includes:
determining the network loss rate, the voltage qualification rate, the load balance degree and the maximum load rate of the power distribution network after the target loop closing transfer power supply paths are closed;
calculating the weight of each target closed-loop power supply switching path according to the network loss rate, the voltage qualified rate, the load balance degree and the maximum load rate;
and performing optimization sequencing on each target closed-loop power supply switching path according to the weight to determine the optimal closed-loop power supply switching path.
2. The method for controlling power distribution network loop closing and power supply switching according to claim 1, wherein the determining whether a target interconnection switch corresponding to the loop closing and power supply switching path whose loop closing power flow does not exceed the threshold has the loop closing condition specifically comprises:
calculating loop closing impact current and loop closing load flow of the target interconnection switch;
judging whether the loop closing impact current and the loop closing tide of the target interconnection switch exceed threshold values or not;
if yes, representing that the corresponding target interconnection switch does not have a loop closing condition;
if not, representing that the corresponding target interconnection switch has a loop closing condition.
3. A power distribution network loop closing transfer power supply control device is applied to the power distribution network loop closing transfer power supply control method of claim 1, and comprises the following steps:
the acquisition module is used for acquiring all loop closing transfer power supply paths in the power distribution network and the interconnection switches corresponding to the loop closing transfer power supply paths;
the judging module is used for judging whether the loop closing power flow after the loop closing transfer power supply paths are closed exceeds a threshold value according to the interconnection switches, if so, the deleting module is triggered, and if not, the recording module is triggered;
the deleting module is used for deleting a loop closing switching power supply path of which the loop closing power flow exceeds a threshold value after loop closing;
the recording module is used for recording a loop closing switching power supply path of which the loop closing power flow does not exceed a threshold value after loop closing;
the step of judging whether the loop closing power flow after the loop closing of each loop closing transfer power supply path exceeds a threshold value according to each interconnection switch further comprises the following steps:
judging whether the loop closing power flow of the corresponding loop closing transfer power supply path after loop closing exceeds a threshold value according to the information of the power supply sheet areas on the two sides of each interconnection switch;
the step of judging whether the loop closing power flow after the loop closing transfer power supply path is closed exceeds a threshold value according to the information of the power supply area on the two sides of each interconnection switch specifically comprises the following steps:
taking a high-voltage side bus of the power supply block transformer substation as a power supply point, respectively tracing power supplies from two sides of a loop closing point switch, if the extracted power supply points on two sides of each contact switch are the same, indicating that the two sides of the loop closing point switch belong to the same power supply block, and the loop closing trend of a corresponding loop closing transfer power supply path after loop closing does not exceed a threshold, otherwise, indicating that the two sides of the loop closing point switch belong to different power supply block, and the loop closing trend of the corresponding loop closing transfer power supply path after loop closing exceeds the threshold, and judging whether the power supply points on two sides of each contact switch corresponding to each loop closing transfer power supply path are the same, namely judging whether the power supply points on two sides of each contact switch corresponding to each loop closing transfer power supply path are the same.
4. The utility model provides a distribution network closes ring and changes power supply controlgear which characterized in that includes:
a memory for storing a computer program;
a processor for executing the computer program to implement the steps of the power distribution network loop closing transfer power control method according to any one of claims 1 to 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810744693.3A CN109378815B (en) | 2018-07-09 | 2018-07-09 | Power distribution network closed loop switching power supply control method, device and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810744693.3A CN109378815B (en) | 2018-07-09 | 2018-07-09 | Power distribution network closed loop switching power supply control method, device and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109378815A CN109378815A (en) | 2019-02-22 |
| CN109378815B true CN109378815B (en) | 2022-05-27 |
Family
ID=65404293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810744693.3A Active CN109378815B (en) | 2018-07-09 | 2018-07-09 | Power distribution network closed loop switching power supply control method, device and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109378815B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110417001B (en) * | 2019-07-08 | 2022-11-04 | 云南电网有限责任公司红河供电局 | 10kV power distribution network tie line loop closing and power transferring method |
| CN111740414A (en) * | 2020-06-30 | 2020-10-02 | 广东电网有限责任公司广州供电局 | Closed loop switching power supply controller and method thereof, and low-voltage load seamless transfer device |
| CN112636471B (en) * | 2020-12-11 | 2022-08-02 | 国网安徽省电力有限公司黄山供电公司 | Method for judging abnormal ring opening in 10KV distribution network ring closing process |
| CN113449266B (en) * | 2021-07-22 | 2024-04-09 | 南方电网海南数字电网研究院有限公司 | Closed loop power supply statistical method based on hand-in-hand line |
| CN113985199A (en) * | 2021-10-25 | 2022-01-28 | 广东电网有限责任公司 | Distribution line loop closing verification method and device, electronic equipment and storage medium |
| CN114512967B (en) * | 2022-01-26 | 2023-11-14 | 浙江双成电气有限公司 | Distribution network protection and automation device and precise and rapid ring opening and closing method for distribution network |
| CN117335578B (en) * | 2023-12-01 | 2024-02-06 | 成都天合一成科技服务有限公司 | Detection and regulation system for loop closing power conversion of low-voltage power distribution |
| CN117394369B (en) * | 2023-12-11 | 2024-02-13 | 四川迪思源科技有限公司 | Uninterrupted power supply-to-power supply regulation and control system based on multidimensional data |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972883A (en) * | 2014-04-11 | 2014-08-06 | 广州供电局有限公司 | Method and system for selecting power distribution network closed loop points |
| CN105656203A (en) * | 2016-01-29 | 2016-06-08 | 国网山东省电力公司青岛供电公司 | Method and device for controlling loop-closing operation |
| CN106026085A (en) * | 2016-06-27 | 2016-10-12 | 中国南方电网有限责任公司 | Power distribution network closed-loop power supply transferring path optimum decision method |
| CN107332236A (en) * | 2017-07-13 | 2017-11-07 | 国网浙江省电力公司 | A kind of network load based on global search turns supplier's method |
| CN107732917A (en) * | 2017-10-23 | 2018-02-23 | 云南电网有限责任公司临沧供电局 | A kind of closed loop network turns power supply Load flow calculation optimization method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611086B (en) * | 2012-03-27 | 2015-01-07 | 许继电气股份有限公司 | Centralized protection system and method for region distribution network |
-
2018
- 2018-07-09 CN CN201810744693.3A patent/CN109378815B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103972883A (en) * | 2014-04-11 | 2014-08-06 | 广州供电局有限公司 | Method and system for selecting power distribution network closed loop points |
| CN105656203A (en) * | 2016-01-29 | 2016-06-08 | 国网山东省电力公司青岛供电公司 | Method and device for controlling loop-closing operation |
| CN106026085A (en) * | 2016-06-27 | 2016-10-12 | 中国南方电网有限责任公司 | Power distribution network closed-loop power supply transferring path optimum decision method |
| CN107332236A (en) * | 2017-07-13 | 2017-11-07 | 国网浙江省电力公司 | A kind of network load based on global search turns supplier's method |
| CN107732917A (en) * | 2017-10-23 | 2018-02-23 | 云南电网有限责任公司临沧供电局 | A kind of closed loop network turns power supply Load flow calculation optimization method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109378815A (en) | 2019-02-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109378815B (en) | Power distribution network closed loop switching power supply control method, device and equipment | |
| Guo et al. | Allocation of centrally switched fault current limiters enabled by 5G in transmission system | |
| CN110086168B (en) | Power distribution network operation topology identification method based on multi-source data fusion | |
| KR20210023127A (en) | System for identifying fault section of power distribution system | |
| CN103093276B (en) | Urban power grid risk assessment method | |
| Dzafic et al. | Impedance based fault location for weakly meshed distribution networks | |
| CN109449934B (en) | Transmission network blocking management and control method based on high-voltage distribution network partition reconstruction | |
| CN108548992B (en) | Distribution network fault positioning method based on assumed fault area | |
| CN113394779A (en) | Virtual power distribution terminal model based on in-place FA logic | |
| CN110048384B (en) | High-reliability self-healing method and system for distribution network | |
| Dua et al. | Fault detection technique for distribution networks and microgrids using synchrophasor data | |
| CN109768544A (en) | Area power grid load transfer method | |
| CN106329714B (en) | A kind of method that dynamic judges power network switch type | |
| Duong et al. | A method for real time voltage stability monitoring in sub-transmission networks | |
| CN113659548B (en) | Power distribution network pilot protection method and system based on positive sequence fault component energy direction | |
| CN114157018B (en) | Distributed feeder automation recovery method based on line load rate and peer-to-peer communication | |
| CN111200286B (en) | Intelligent power supply recovery method for self-healing of power distribution network | |
| CN111880036B (en) | Power distribution network fault monitoring method and device based on wide-area measurement data | |
| CN114325234A (en) | Power distribution network fault positioning method based on genetic optimization algorithm | |
| CN114386222A (en) | Power distribution network cooperative fault recovery method and system based on information physical system | |
| CN113346462A (en) | Petal type power distribution network contact line protection method based on predicted voltage amplitude | |
| TW202029612A (en) | Method for controlling renewable energy and distribution automation integrated system wherein the distribution automation system can transmit the faulty feeder switch switching information to the renewable energy management system for performing the grid-connected impact analysis based on the load change information | |
| CN111914377A (en) | Method and system for repairing feeder line loss model, computer equipment and readable storage medium | |
| Duan et al. | Fault location and self-healing of distribution network based on function block and wireless sensor | |
| CN112311090A (en) | Distributed fault recovery method and system for ring distribution network adapting to 5G communication network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |