Power distribution line transfer method and system

Abstract

The invention discloses a power distribution line transfer method and system. The power distribution line transfer method comprises the following steps: acquiring the power utilization priority level of each line, the power supply state parameter, the current, the load capacity and the total capacity of a transformer of a transfer line, and the current and the load capacity of a line to be transferred; calculating the health degree of each transfer line according to the power supply state parameters of the transfer lines; calculating the load current margin of each transfer line according to the current of the transfer line and the current of the line to be transferred; according to the load capacity of the transfer supply line, the total capacity of the transformer and the load capacity of the to-be-transferred supply line, calculating the transfer supply capacity margin of the transformer substation of each to-be-transferred supply line; and determining a target transfer line according to at least one of the power utilization priority of each line, the health degree of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation. According to the technical scheme provided by the embodiment of the invention, the transfer effect of the distribution line is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power distribution network, and in particular to a power distribution line transfer method and system. Background Art

[0002] With the construction of smart grids in my country over the years, the automation level of distribution networks has become higher and higher. The power supply companies are also increasing their requirements for the speed of responding to the demands of low-voltage users of distribution networks. However, power grid failures and outages still occur from time to time.

[0003] When the bus voltage loses pressure, the load borne by the bus needs to be transferred through other substations. However, the bus has a large number of outgoing lines, and the existing manual decision-making method has a poor transfer effect. Summary of the invention

[0004] The present invention provides a power distribution line transfer method and system to solve the problem of poor power distribution line transfer effect.

[0005] According to one aspect of the present invention, a power distribution line transfer method is provided, comprising:

[0006] Obtain the power priority of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the line to be transferred;

[0007] Calculating the health of each of the transfer lines according to the power supply status parameters of the transfer lines;

[0008] Calculating the load current margin of each of the transfer lines according to the current of the transfer line and the current of the line to be transferred;

[0009] Calculating the transfer capacity margin of the substation of each of the lines to be transferred according to the load capacity of the transfer line and the total capacity of the transformer, as well as the load capacity of the lines to be transferred;

[0010] The target transfer line is determined according to at least one of the power usage priority level of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation.

[0011] Optionally, the power supply status parameters of the transfer line include: the operating status of the transfer line, whether the contact switch in the transfer line is an automatic switch, the load rate of the transfer line and the terminal voltage of the line to be transferred after the transfer;

[0012] The health of the transfer line is: the product of the characterization value of the operating status of the transfer line and its corresponding weight value, the product of the characterization value of whether the connecting switch in the transfer line is an automatic switch and its corresponding weight value, the product of the load rate of the transfer line and its corresponding weight value, and the sum of the product of the terminal voltage of the line to be transferred after the transfer and its corresponding weight value.

[0013] Optionally, determining the target transfer line according to at least one of the power priority level of each line, the health of each transfer line, the load current margin of each transfer line, and the transfer capacity margin of each substation comprises:

[0014] Determining a first power transfer line according to the power priority level;

[0015] According to the health level, determining a second supply transfer route among the first supply transfer routes;

[0016] According to the load current margin, determining a third transfer line in the second transfer line;

[0017] The target transfer line is determined in the third transfer lines according to the transfer capacity margin.

[0018] Optionally, determining the first power transfer line according to the power priority level includes:

[0019] Sorting the electricity usage priority of each line;

[0020] According to the ranking result of the power usage priority levels, the lines to be transferred are controlled to receive the transferred power in the order of the power usage priority levels from high to low;

[0021] According to the ranking result of the power usage priority levels, the power transfer lines are controlled to transfer power in the order of the power usage priority levels from low to high.

[0022] Optionally, determining a second transfer line in the first transfer line according to the health level includes:

[0023] The health degrees of the first transfer lines are sorted, and the transfer line corresponding to the maximum health degree is determined as the second transfer line.

[0024] Optionally, determining a third transfer line in the second transfer line according to the load current margin includes:

[0025] sorting the load current margins of the second transfer lines;

[0026] Compare the load current margin of the highest transfer line with the load current margin of the line to be transferred, and when the load current margin of the transfer line is greater than the load current margin of the line to be transferred, control the highest transfer line to transfer power to the line to be transferred;

[0027] When the load current margin of the highest transfer line is less than or equal to the load current margin of the line to be transferred, and the sum of the load current margins of the highest transfer line and the second highest transfer line is greater than the load current margin of the line to be transferred, the highest transfer line and the second highest transfer line are controlled to transfer power to the line to be transferred at the same time.

[0028] Optionally, the determining the target transfer line in the third transfer line according to the transfer capacity margin comprises:

[0029] When the sum of the load capacity of the transfer line and the load capacity of the line to be transferred is less than the product of the total capacity of the substation with the maximum capacity of the line to be transferred and the safety factor of the transformer, transfer power through the substation with the maximum capacity;

[0030] When the sum of the load capacity of the transferred line and the load capacity of the line to be transferred is greater than or equal to the product of the total capacity of the substation with the maximum capacity of the line to be transferred and the safety factor of the transformer, and the sum of the load capacity of the transferred line and the load capacity of the line to be transferred is less than the product of the total capacity of the substation with the maximum capacity and the second largest capacity and the safety factor of the transformer, the substation with the maximum capacity and the second largest capacity are controlled to transfer power at the same time.

[0031] Optionally, after determining the target transfer line according to at least one of the power priority level of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation, the method further comprises:

[0032] The target transfer line is controlled to supply power to the to-be-transferred line.

[0033] Optionally, the obtaining of the power priority of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the transfer line include:

[0034] When the bus voltage loses pressure, a fault alarm is issued and the fault type is confirmed;

[0035] The fault type includes at least one of an immediate response type fault, a waiting response type fault and a manual confirmation type fault.

[0036] According to another aspect of the present invention, there is provided a power distribution line transfer system, comprising:

[0037] The data acquisition module is used to obtain the power priority of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the line to be transferred;

[0038] A calculation module, used to calculate the health of each of the transfer lines according to the power supply status parameters of the transfer lines; calculate the load current margin of each of the transfer lines according to the current of the transfer lines and the current of the lines to be transferred; calculate the transfer capacity margin of the substation of each of the lines to be transferred according to the load capacity of the transfer lines and the total capacity of the transformers, as well as the load capacity of the lines to be transferred;

[0039] The line selection module is used to determine the target transfer line according to at least one of the power priority level of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation.

[0040] The technical solution provided by the embodiment of the present invention achieves the optimal selection of the transfer lines by obtaining the power priority of each line and calculating the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation, thereby improving the reliability and stability of the transfer line supplying power to the line to be transferred. The present invention determines the target transfer line by judging various key information of the transfer line. By using the target transfer line as the transfer line, the stable operation of the distribution line can be guaranteed, and the transfer effect is good.

[0041] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0043] Figure 1 is a flow chart of a power distribution line transfer method provided according to an embodiment of the present invention;

[0044] Figure 2is a structural schematic diagram of a power distribution line provided according to an embodiment of the present invention;

[0045] Figure 3 is a flow chart of another power distribution line transfer method provided according to an embodiment of the present invention;

[0046] Figure 4 is a flowchart of a specific implementation method of S151 provided according to an embodiment of the present invention;

[0047] Figure 5 is a flowchart of a specific implementation method of S153 provided according to an embodiment of the present invention;

[0048] Figure 6 It is a structural schematic diagram of a distribution line transfer system provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] An embodiment of the present invention provides a power distribution line transfer method. Figure 1 A flow chart of a power distribution line transfer method provided by an embodiment of the present invention. Figure 1 , the method comprising:

[0052] S110, obtaining the power priority of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the line to be transferred.

[0053] Among them, the transformer in the substation can step up or down the voltage of the electric energy and then supply it to the distribution line through the bus. Different distribution lines can correspond to different substations. For dual power supply or multi-power supply systems, multiple substations may be connected to the same distribution line, and multiple substations are isolated by interconnection switches. When the voltage of a bus in the distribution line is abnormal, in order to prevent the fault from affecting the electricity users on the bus side, the connection between the transformer and the bus can be disconnected, and the interconnection switch in the line can be opened, so that the electric energy of other buses can be supplied to the users on the bus pressure loss side through the interconnection switch.

[0054] Therefore, the line connected to the busbar voltage loss side is the line to be transferred, and the line connected to the other busbar sides is the transfer line. When the contact switch is turned on, the transfer line can supply power to the line to be transferred.

[0055] S120. Calculate the health of each transfer line according to the power supply status parameters of the transfer line.

[0056] Among them, before the transferred line supplies power to the line to be transferred, it is necessary to judge the health of the line. The health can be used to reflect whether there is a fault in the line to be transferred, whether the load rate meets the power supply demand, and whether the terminal voltage will be too low after the transfer.

[0057] There may be multiple transfer lines connected to a line to be transferred. By calculating the health, the transfer line with better health can be selected for power supply, thereby improving the reliability of power supply.

[0058] S130. Calculate the load current margin of each transfer line according to the current of the transfer line and the current of the line to be transferred.

[0059] When the transfer line supplies power to the line to be transferred, the load of the line to be transferred will be transferred to the transfer line, so that the load current of the line to be transferred increases. By calculating the load current margin of each transfer line, it can be ensured that the sum of the load current of the line to be transferred and the load current of the transfer line is within the range of the line safety current, thereby ensuring the stable power supply of the transfer line.

[0060] S140. Calculate the transfer capacity margin of the substation of each line to be transferred based on the load capacity of the transfer line and the total capacity of the transformer, as well as the load capacity of the line to be transferred.

[0061] When a line on the outgoing side of the substation is used as a transfer line to supply power to the line to be transferred, it is necessary to ensure that the substation has sufficient transfer capacity margin to ensure that the power load of the line to be transferred can operate stably. When the transfer capacity margin of the substation is insufficient, other substations connected to the line to be transferred can be selected to supply power, or other substations connected to the line to be transferred can be used together to supply power.

[0062] S150. Determine a target transfer line according to at least one of the power priority of each line, the health of each transfer line, the load current margin of each transfer line, and the transfer capacity margin of each substation.

[0063] Among them, the electricity priority level can be used to reflect the importance of electricity users in different lines. For example, the electricity priority level can be divided into three levels. The first level has the highest priority level, and it is necessary to ensure continuous power supply under any circumstances, such as electricity for hospitals and transportation hubs. The second level has a higher priority level, such as electricity for shopping malls and schools. The third level has the lowest priority level and can withstand power outages to a certain extent, such as residential electricity.

[0064] In the embodiment of the present invention, different target transfer lines can be selected according to different lines by weighting the power priority, health, load current margin, and transfer capacity margin. For example, the target transfer line can be selected in the order of the power priority, health, load current margin, and transfer capacity margin from high to low.

[0065] The technical solution provided by the embodiment of the present invention achieves the optimal selection of the transfer lines by obtaining the power priority of each line and calculating the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation, thereby improving the reliability and stability of the transfer line supplying power to the line to be transferred. The present invention determines the target transfer line by judging various key information of the transfer line. By using the target transfer line as the transfer line, the stable operation of the distribution line can be guaranteed, and the transfer effect is good.

[0066] On the basis of the above embodiments, optionally, the power supply status parameters of the transfer line include: the operation status of the transfer line, whether the connecting switch in the transfer line is an automatic switch, the load rate of the transfer line, and the terminal voltage of the line to be transferred after the transfer. The health of the transfer line is: the sum of the product of the characterization value of the operation status of the transfer line and its corresponding weight value, the product of the characterization value of whether the connecting switch in the transfer line is an automatic switch and its corresponding weight value, the product of the load rate of the transfer line and its corresponding weight value, and the product of the terminal voltage of the line to be transferred after the transfer and its corresponding weight value.

[0067] Among them, the power supply status parameters of the transfer line can be expressed by the operating status of the transfer line, the type of the connecting switch, the load rate of the transfer line and the terminal voltage of the line to be transferred. The power supply status parameters of the transfer line can be used to determine the health of the transfer line.

[0068] Specifically, H = Q1C1 + Q2C2 + Q3 (1-C3) + Q4C4;

[0069] Among them, H is the health of the transfer line, C1 is the characterization value of the operating status of the transfer line, C2 is the characterization value of whether the connecting switch in the transfer line is an automatic switch, C3 is the load rate of the transfer line, and C4 is the terminal voltage of the line to be transferred after the transfer; Q1, Q2, Q3 and Q4 are the weight values ​​of C1, C2, C3 and C4 respectively.

[0070] Exemplarily, the operating status of the transfer line can be used to indicate whether there are abnormalities or defects in the transfer line. For example, when the defects in the transfer line are serious, the transfer line has poor power supply stability, which may cause safety accidents such as switch cabinet explosion during power supply. Therefore, C1 can be set to 0-1. The larger the value, the better the operating status of the transfer line and the higher the health of the transfer line.

[0071] C2 can be set to 0 or 1. When the tie switch is an automatic switch, there is no need to go to the site to close or open the switch, which has a better control effect. Therefore, when the tie switch is an automatic switch, C2 is 1, and when the tie switch is a non-automatic switch, C2 is 0.

[0072] The load rate is the ratio of the actual load power to the rated load capacity of the line. The smaller the load rate of the transfer line is, the more load can be transferred to the line to be transferred, and the healthier the transfer line is.

[0073] When the transfer line supplies power to the line to be transferred, the terminal voltage of the line to be transferred will also decrease due to the increase in load. When the terminal voltage is too low, the power reliability of the users of the line to be transferred may be reduced. Therefore, when the terminal voltage of the line to be transferred is high, the health of the transfer line is better.

[0074] Q1, Q2, Q3 and Q4 can be set differently according to different requirements of the line, and can be used to indicate the importance of various power supply status parameters. Exemplarily, the size of Q1, Q2, Q3 and Q4 can be: Q1>Q3>Q4>Q2.

[0075] Figure 2 This is a schematic diagram of the structure of a power distribution line provided by an embodiment of the present invention. Figure 2 Optionally, the distribution line includes: a transformer 1, a connecting switch 2, an outlet switch 3 and a transformer switch 4.

[0076] Among them, the outgoing line switch 3 is used to supply power to various loads, including electricity users. When the distribution line operates normally, the connecting switch 2 is in a disconnected state, and the outgoing line switch 3 is powered by the bus directly connected to it. When the bus voltage connected to the first transformer 11 is abnormal, the transformer switch 4 is disconnected, and the first outgoing line switch 31, the second outgoing line switch 32 and the third outgoing line switch 33 lose power, causing the load to be powered off. At this time, by closing the first connecting switch 21 and / or the second connecting switch 22, the second transformer 12 can supply power to the first outgoing line switch 31 through the fourth outgoing line switch 34, and the third transformer 13 can supply power to the first outgoing line switch 31 through the fifth outgoing line switch 35.

[0077] By closing the third connecting switch 23, the third transformer 13 can supply power to the second outgoing switch 32 through the sixth outgoing switch 36. By closing the fourth connecting switch 24, the fourth transformer 14 can supply power to the third outgoing switch 33 through the seventh outgoing switch 37. With this arrangement, when the bus voltage connected to the first transformer 11 is abnormal, the outgoing switch 3 connected to the bus side can continue to supply power to the load, thereby improving the power supply reliability of the distribution line.

[0078] It should be noted that Figure 2 The structural diagram of the distribution line in the figure is only the topology of one type of distribution line, and does not limit the structure of the distribution line. The distribution line can be any line that can realize the power supply and distribution function. The distribution line transfer method provided by the present invention can be applied to any line that can realize the power supply and distribution function. When the distribution line is transferred, the same line to be transferred may be connected to multiple transfer lines. Therefore, it is necessary to selectively select a suitable transfer line for power supply, which is explained in detail below.

[0079] Figure 3 This is a flow chart of another power distribution line transfer method provided by an embodiment of the present invention. Figure 3 On the basis of the above embodiments, optionally, S150, according to at least one of the power priority of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation, determining the target transfer line includes:

[0080] S151. Determine the first power transfer line according to the power priority level.

[0081] Among them, the power priority level can be used as the primary consideration for selecting the transfer line. For example, when there are important users such as hospitals in the transfer line, it is necessary to ensure their reliable power supply to the greatest extent. Therefore, the transfer line that supplies power to such important users can be used as the first transfer line. Because there may be multiple transfer lines connected to the same transfer line, the first transfer line may include multiple ones.

[0082] S152. Determine a second transfer line in the first transfer line according to the health level.

[0083] Among them, health can be used as a secondary consideration for the selection of the transfer line. By selecting a transfer line with a higher health for power supply in the first transfer line, the reliability of power supply can be improved, thereby avoiding the occurrence of safety accidents in the transfer line after the transfer.

[0084] S153. Determine a third transfer line in the second transfer line according to the load current margin.

[0085] Among them, the higher the load current margin of the transfer line, the stronger the load acceptance capacity of the transfer line. Therefore, the transfer line with a high load current margin can be preferentially selected as the third transfer line.

[0086] S154. Determine a target transfer line in the third transfer line according to the transfer capacity margin.

[0087] Among them, the transfer capacity margin is used to indicate whether the power generated by the transformer of each substation can meet the load of the transfer line and the load demand of the transfer line. In order to ensure that the transfer line can still use electricity stably when the load is large, the transfer line with a higher load current margin can be selected as the target transfer line.

[0088] The embodiment of the present invention realizes the screening of the transfer line by judging the power priority level, health, load current margin and transfer capacity margin, and the target transfer line is the optimal line for supplying power to the line to be transferred. Supplying power to the line to be transferred through the target transfer line can greatly improve the power supply reliability of the transfer line, improve the power quality of the power supply, and have a good transfer effect.

[0089] Figure 4 This is a flowchart of a specific implementation method of S151 provided by an embodiment of the present invention. Figure 4 Based on the above embodiments, optionally, S151, determining the first transfer line according to the power priority level includes:

[0090] S1511. Sort the electricity usage priority of each line.

[0091] S1512. According to the ranking result of the power usage priority levels, control the lines to be transferred to receive the transferred power in the order of the power usage priority levels from high to low.

[0092] Among them, when the lines to be transferred receive the transferred power, the power supply stability of the lines with higher power priority levels should be guaranteed first. Therefore, the power priority levels of each line can be sorted first, and the lines with higher power priority levels can be selected to receive the transferred power first. This setting method can give priority to the power supply of the lines with higher power priority levels, avoiding major losses caused by power outages to important power users.

[0093] S1513. According to the ranking result of the power usage priority levels, control the transfer lines to transfer power in the order of the power usage priority levels from low to high.

[0094] Among them, when the transfer line is transferring power, if the power priority of the transfer line is high, that is, there are more important users in the transfer line. In order to ensure the stability of power consumption of important users, other transfer lines with lower power priority levels can be selected to transfer power first, so as to avoid abnormal power consumption of important users in the transfer line when the transfer line supplies power to the line to be transferred.

[0095] On the basis of the above embodiments, optionally, S152, according to the health, determining the second transfer line in the first transfer line includes: sorting the health of each first transfer line, and determining the transfer line corresponding to the maximum health value as the second transfer line.

[0096] Among them, the health degree can be used to indicate the health status of the transfer line. The higher the health degree value, the better the health of the transfer line. Power supply through the transfer line with a high health degree value can reduce the occurrence of safety conditions such as excessive line load, low voltage at the end of the line to be transferred, and even abnormalities in the switch cabinet equipped with the transfer line when the transfer line supplies power to the line to be transferred.

[0097] Figure 5 This is a flowchart of a specific implementation method of S153 provided by an embodiment of the present invention. Figure 5 On the basis of the above embodiments, optionally, S153, according to the load current margin, in the second transfer line, determining the third transfer line includes:

[0098] S1531. Sort the load current margins of the second transfer lines.

[0099] S1532. Compare the load current margin of the highest transfer line with the load current margin of the line to be transferred. When the load current margin of the transfer line is greater than the load current margin of the line to be transferred, control the highest transfer line to transfer power to the line to be transferred.

[0100] Among them, by selecting a transfer line with a larger load current margin for power supply, it can be guaranteed to the greatest extent that the transfer line will not be overloaded after the transfer.

[0101] Specifically, I1+I2<K1I 1MAX ;

[0102] Among them, I1 is the load current of the transfer line, I2 is the load current of the line to be transferred, K1 is the safety factor of the transfer line, I 1MAX To transfer the safe current of the line.

[0103] Exemplarily, K1 can be set to 0.8. When the sum of the load current of the transfer line and the load current of the line to be transferred is less than 80% of the safe current of the transfer line after the transfer, it means that the transfer line will not have an overload problem after the transfer.

[0104] S1533. When the load current margin of the highest transfer line is less than or equal to the load current margin of the line to be transferred, and the sum of the load current margins of the highest transfer line and the second highest transfer line is greater than the load current margin of the line to be transferred, control the highest transfer line and the second highest transfer line to transfer power to the line to be transferred at the same time.

[0105] Among them, when the transfer line with the largest load current margin still cannot meet the load demand of the line to be transferred, the transfer line with the highest load current margin and the transfer line with the second highest load current margin can be used to transfer power to the line to be transferred. If the two transfer lines and the load current margin still cannot guarantee the load demand of the line to be transferred, the transfer line with the third highest load current margin can continue to be selected until the load demand of the line to be transferred is met.

[0106] On the basis of the above embodiments, optionally, according to the transfer capacity margin, in the third transfer line, determining the target transfer line includes: when the sum of the load capacity of the transfer line and the load capacity of the line to be transferred is less than the product of the total capacity of the substation with the maximum capacity of the line to be transferred and the safety factor of the transformer, power is transferred through the substation with the maximum capacity.

[0107] Among them, ∑S i +∑S j <k2S 总 ;

[0108] Si is the load capacity of the transfer line, S j is the load capacity of the line to be transferred, k2 is the transformer operation safety factor, S 总 It is the total capacity of the substation of the line to be transferred.

[0109] Exemplarily, k2 may be 1.2-1.5. When the total capacity of the substation with the largest capacity satisfies the load capacity of the transfer line and the load capacity of the line to be transferred, the power transfer can be carried out through the substation.

[0110] Optionally, when the sum of the load capacity of the transferred line and the load capacity of the line to be transferred is greater than or equal to the product of the total capacity of the substation with the maximum capacity of the line to be transferred and the safety factor of the transformer, and the sum of the load capacity of the transferred line and the load capacity of the line to be transferred is less than the product of the total capacity of the substation with the maximum capacity and the second largest capacity and the safety factor of the transformer, the substation with the maximum capacity and the second largest capacity are controlled to transfer power at the same time.

[0111] Among them, when the total capacity of the largest capacity substation cannot meet the load capacity of the transfer line and the load capacity of the line to be transferred, the power can be transferred through the largest capacity substation and the second largest capacity substation at the same time. If the two substations still cannot meet the load capacity requirements, the third largest capacity substation can continue to be selected until the load capacity requirements are met.

[0112] On the basis of the above embodiments, optionally, after determining the target transfer line according to at least one of the power priority levels of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation, it includes: controlling the target transfer line to supply power to the line to be transferred.

[0113] Among them, the target transfer line is the optimal transfer line. Supplying power to the line to be transferred through the target transfer line has the best power transfer effect, can meet the power demand of the line to be transferred to the greatest extent, and can also ensure stable and safe power supply of the transfer line.

[0114] On the basis of the above embodiments, optionally, before obtaining the power priority of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the line to be transferred, it includes: when the bus voltage loses pressure, a fault alarm is issued and the fault type is confirmed. Among them, the fault type includes: at least one of an immediate response type fault, a waiting response type fault and a manual confirmation type fault.

[0115] Among them, immediate response type faults are serious permanent faults of equipment in the substation. Normal power supply cannot be restored in the short term and line transfer is required immediately, such as switch cabinet explosion, main transformer gas protection action and other fault tripping signals.

[0116] Waiting for response type faults are when there is a fault point in the distribution line but some switches refuse to operate, causing the transformer backup protection to operate. This type of fault is a common cause of busbar voltage loss. When a waiting for response type fault occurs, the system also needs to synchronously obtain the switch alarm signal of the distribution network dispatching system for double confirmation. This type of busbar voltage loss can be handled quickly, and the busbar voltage can be restored to normal quickly after isolating the fault. Therefore, there is no need to transfer the supply immediately, and you can wait for the dispatcher to further manually determine whether to transfer to an immediate response type fault.

[0117] The time limit for handling manually confirmed faults is uncertain. For example, a transmission line trip may be handled quickly or may take a long time. The dispatcher needs to make manual judgments based on the actual situation reported by on-site operating personnel to determine whether to upgrade the manually confirmed fault to an immediate response fault.

[0118] In order to improve the response speed, waiting response type faults and manual confirmation type faults can also be merged into immediate response type faults, so that the transfer strategy can be generated in advance, and whether to implement the transfer strategy in the end can be determined by the dispatcher.

[0119] An embodiment of the present invention provides a power distribution line transfer system. Figure 6 This is a schematic diagram of the structure of a power distribution line transfer system provided by an embodiment of the present invention. Figure 6 , the distribution line transfer system includes:

[0120] The data acquisition module 5 is used to obtain the power consumption priority level of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the line to be transferred.

[0121] Calculation module 6 is used to calculate the health of each transfer line according to the power supply status parameters of the transfer line; calculate the load current margin of each transfer line according to the current of the transfer line and the current of the line to be transferred; calculate the transfer capacity margin of the substation of each line to be transferred according to the load capacity of the transfer line and the total capacity of the transformer, as well as the load capacity of the line to be transferred.

[0122] The line selection module 7 is used to determine the target transfer line according to at least one of the power priority of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation.

[0123] The power distribution line transfer system provided in the embodiment of the present invention can execute the power distribution line transfer method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0124] Optionally, the line selection module 7 is also used to determine the first transfer line according to the electricity priority level; determine the second transfer line in the first transfer line according to the health level; determine the third transfer line in the second transfer line according to the load current margin; and determine the target transfer line in the third transfer line according to the transfer capacity margin.

[0125] Optionally, the line selection module 7 is also used to sort the electricity priority levels of each line; according to the sorting results of the electricity priority levels, control the lines to be transferred to receive the transferred electricity in the order of the electricity priority levels from high to low; according to the sorting results of the electricity priority levels, control the transferred lines to transfer electricity in the order of the electricity priority levels from low to high.

[0126] Optionally, the line selection module 7 is further used to sort the health degrees of each of the first transfer lines, and determine the transfer line corresponding to the maximum health degree as the second transfer line.

[0127] Optionally, the line selection module 7 is also used to sort the load current margins of each of the second transfer lines; compare the load current margin of the highest transfer line with the load current margin of the line to be transferred, and when the load current margin of the transfer line is greater than the load current margin of the line to be transferred, control the highest transfer line to transfer power to the line to be transferred; when the load current margin of the highest transfer line is less than or equal to the load current margin of the line to be transferred, and the sum of the load current margins of the highest transfer line and the second highest transfer line is greater than the load current margin of the line to be transferred, control the highest transfer line and the second highest transfer line to simultaneously transfer power to the line to be transferred.

[0128] Optionally, the line selection module 7 is also used to transfer power through the substation with the largest capacity when the sum of the load capacity of the transfer line and the load capacity of the line to be transferred is less than the product of the total capacity of the substation with the largest capacity of the line to be transferred and the safety factor of the transformer; when the sum of the load capacity of the transfer line and the load capacity of the line to be transferred is greater than or equal to the product of the total capacity of the substation with the largest capacity of the line to be transferred and the safety factor of the transformer, and the sum of the load capacity of the transfer line and the load capacity of the line to be transferred is less than the product of the total capacity of the substation with the largest capacity and the second largest capacity and the safety factor of the transformer, control the substation with the largest capacity and the second largest capacity to transfer power at the same time.

[0129] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0130] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power distribution line transfer method, characterized in that: include: Obtain the power priority of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the line to be transferred; Calculating the health of each of the transfer lines according to the power supply status parameters of the transfer lines; Calculating the load current margin of each of the transfer lines according to the current of the transfer line and the current of the line to be transferred; Calculating the transfer capacity margin of the substation of each of the lines to be transferred according to the load capacity of the transfer line and the total capacity of the transformer, as well as the load capacity of the lines to be transferred; The target transfer line is determined according to at least one of the power usage priority level of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation.

2. The power distribution line transfer method according to claim 1, characterized in that: The power supply status parameters of the transfer line include: the operation status of the transfer line, whether the contact switch in the transfer line is an automatic switch, the load rate of the transfer line and the terminal voltage of the line to be transferred after the transfer; The health of the transfer line is: the product of the characterization value of the operating status of the transfer line and its corresponding weight value, the product of the characterization value of whether the connecting switch in the transfer line is an automatic switch and its corresponding weight value, the product of the load rate of the transfer line and its corresponding weight value, and the sum of the product of the terminal voltage of the line to be transferred after the transfer and its corresponding weight value.

3. The power distribution line transfer method according to claim 1, characterized in that: Determining the target transfer line according to at least one of the power priority level of each line, the health of each transfer line, the load current margin of each transfer line, and the transfer capacity margin of each substation comprises: Determining a first power transfer line according to the power priority level; According to the health level, determining a second supply transfer route among the first supply transfer routes; According to the load current margin, determining a third transfer line in the second transfer line; The target transfer line is determined in the third transfer lines according to the transfer capacity margin.

4. The power distribution line transfer method according to claim 3, characterized in that: The step of determining the first power transfer line according to the power priority level comprises: Sorting the electricity usage priority of each line; According to the ranking result of the power usage priority levels, the lines to be transferred are controlled to receive the transferred power in the order of the power usage priority levels from high to low; According to the ranking result of the power usage priority levels, the power transfer lines are controlled to transfer power in the order of the power usage priority levels from low to high.

5. The power distribution line transfer method according to claim 3, characterized in that: Determining a second transfer route in the first transfer route according to the health level includes: The health degrees of the first transfer lines are sorted, and the transfer line corresponding to the maximum health degree is determined as the second transfer line.

6. The power distribution line transfer method according to claim 3, characterized in that: Determining a third transfer line in the second transfer line according to the load current margin comprises: sorting the load current margins of the second transfer lines; Compare the load current margin of the highest transfer line with the load current margin of the line to be transferred, and when the load current margin of the transfer line is greater than the load current margin of the line to be transferred, control the highest transfer line to transfer power to the line to be transferred; When the load current margin of the highest transfer line is less than or equal to the load current margin of the line to be transferred, and the sum of the load current margins of the highest transfer line and the second highest transfer line is greater than the load current margin of the line to be transferred, the highest transfer line and the second highest transfer line are controlled to transfer power to the line to be transferred at the same time.

7. The power distribution line transfer method according to claim 3, characterized in that: Determining the target transfer line in the third transfer line according to the transfer capacity margin comprises: When the sum of the load capacity of the transfer line and the load capacity of the line to be transferred is less than the product of the total capacity of the substation with the maximum capacity of the line to be transferred and the safety factor of the transformer, transfer power through the substation with the maximum capacity; When the sum of the load capacity of the transferred line and the load capacity of the line to be transferred is greater than or equal to the product of the total capacity of the substation with the maximum capacity of the line to be transferred and the safety factor of the transformer, and the sum of the load capacity of the transferred line and the load capacity of the line to be transferred is less than the product of the total capacity of the substation with the maximum capacity and the second largest capacity and the safety factor of the transformer, the substation with the maximum capacity and the second largest capacity are controlled to transfer power at the same time.

8. The power distribution line transfer method according to claim 1, characterized in that: After determining the target transfer line according to at least one of the power priority level of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation, the method comprises: The target transfer line is controlled to supply power to the to-be-transferred line.

9. The power distribution line transfer method according to claim 1, characterized in that: The obtaining of the power priority of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the transfer line include: When the bus voltage loses pressure, a fault alarm is issued and the fault type is confirmed; The fault type includes at least one of an immediate response type fault, a waiting response type fault and a manual confirmation type fault.

10. A power distribution line transfer system, characterized in that: include: The data acquisition module is used to obtain the power priority of each line, the power supply status parameters, current, load capacity and total transformer capacity of the transfer line, and the current and load capacity of the line to be transferred; A calculation module, used to calculate the health of each of the transfer lines according to the power supply status parameters of the transfer lines; Calculating the load current margin of each of the transfer lines according to the current of the transfer line and the current of the line to be transferred; Calculating the transfer capacity margin of the substation of each of the lines to be transferred according to the load capacity of the transfer line and the total capacity of the transformer, as well as the load capacity of the lines to be transferred; The line selection module is used to determine the target transfer line according to at least one of the power consumption priority level of each line, the health of each transfer line, the load current margin of each transfer line and the transfer capacity margin of each substation.

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