Reclosing starting method, device, equipment, storage medium and power system

Abstract

The application discloses a reclosing starting method and device, equipment, storage medium and a power system, and relates to the technical field of power systems, which can improve the success rate of reclosing starting of a power station side with small power source grid connection. The method comprises the following steps: when a fault occurs in a main supply line between a first power station and a second power station, the output power of an adjustable small power source is controlled and adjusted, and / or the number of voltage regulating elements connected to the second power station in a voltage regulating element group is controlled and adjusted, until the reclosing of the second power station side on the main supply line meets a synchronization checking condition; wherein the first power station contains a large power source and is used for providing a main power source to the second power station; the adjustable small power source is used for providing a secondary power source to the second power station; and the voltage regulating element group is used for regulating the voltage of a bus of the second power station; and if it is determined that the reclosing of the second power station side meets the synchronization checking condition, the reclosing of the second power station side is controlled and started.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and in particular to a reclosing starting method, device, equipment, storage medium and power system. BACKGROUND

[0002] In the process of overhead line operation, transient faults often occur, and timely restoration of line operation can avoid long-term power failure accidents. The use of reclosing can meet the reliability requirements of line operation. There are three common reclosing starting methods, which are line detection without voltage bus with voltage, bus detection without voltage line with voltage and synchronization detection. For the reclosing of the small power grid-connected substation, the synchronization detection reclosing starting method is generally used.

[0003] However, since the small power supply generally does not have a low-voltage low-frequency generator function, when the main supply line between the small power grid-connected substation and the substation providing the main power supply fails, the small power supply of the small power grid-connected substation can still bring part of the load through its own output, supporting the voltage of the small power grid-connected substation. At this time, the small power grid-connected substation side and the main supply line side will lose synchronization, resulting in that the reclosing of the small power grid-connected substation side cannot meet the synchronization detection condition, causing the reclosing starting failure. Therefore, how to improve the success rate of the reclosing starting of the small power grid-connected substation side has become a problem to be solved. SUMMARY

[0004] The present application provides a reclosing starting method, device, equipment, storage medium and power system, which can improve the success rate of the reclosing starting of the small power grid-connected substation side.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a reclosing starting method, comprising: in the case of determining that the main supply line between the first substation and the second substation fails, controlling to adjust the output power of the adjustable small power supply and / or controlling to adjust the number of voltage regulating elements connected to the second substation in the voltage regulating element group, until the reclosing of the second substation side on the main supply line meets the synchronization detection condition; if it is determined that the reclosing of the second substation side meets the synchronization detection condition, controlling the reclosing of the second substation side to start; wherein the first substation contains a large power supply for providing a main power supply to the second substation; the adjustable small power supply is used to provide a secondary power supply to the second substation; and the voltage regulating element group is used to regulate the voltage of the bus of the second substation.

[0007] In the technical scheme provided in the present application, the second transformer substation is a transformer substation with a small power source, the first transformer substation with a large power source can provide a main power source for the second transformer substation, and the adjustable small power source can provide a secondary power source for the second transformer substation. When a fault occurs in the main supply line between the first transformer substation and the second transformer substation, the adjustable small power source can bring part of the load of the second transformer substation through its output, which may cause the second transformer substation side and the main supply line side to lose synchronization, resulting in that the reclosing of the second transformer substation side cannot meet the synchronization check condition. The reason why the second transformer substation side and the main supply line side lose synchronization and do not meet the synchronization check condition may be that the frequencies of the two sides are not synchronized, or may be that the voltages of the two sides are not synchronized. Therefore, the present application can synchronize the frequencies of the two sides by automatically adjusting the output power of the adjustable small power source when a fault occurs in the main supply line, and / or synchronize the voltages of the two sides by automatically adjusting the number of voltage regulating elements in the voltage regulating element group connected to the second transformer substation, so as to improve the probability of meeting the synchronization check condition, thereby improving the success rate of the reclosing start of the second transformer substation side, that is, the success rate of the reclosing start of the transformer substation with a small power source.

[0008] Optionally, in a possible design, the above-mentioned "controlling adjustment of the output power of the adjustable small power source and / or controlling adjustment of the number of voltage regulating elements in the voltage regulating element group connected to the second transformer substation, until the reclosing of the second transformer substation side on the main supply line meets the synchronization check condition" can include:

[0009] controlling adjustment of the output power of the adjustable small power source based on the current frequency difference between the bus of the second transformer substation and the main supply line, and / or controlling adjustment of the number of voltage regulating elements in the voltage regulating element group connected to the second transformer substation based on the current voltage difference between the bus of the second transformer substation and the main supply line, until the reclosing of the second transformer substation side meets the synchronization check condition.

[0010] Optionally, in another possible design, the above-mentioned "controlling adjustment of the output power of the adjustable small power source based on the current frequency difference between the bus of the second transformer substation and the main supply line, and / or controlling adjustment of the number of voltage regulating elements in the voltage regulating element group connected to the second transformer substation based on the current voltage difference between the bus of the second transformer substation and the main supply line, until the reclosing of the second transformer substation side meets the synchronization check condition" can include:

[0011] determining whether the current frequency difference is greater than a preset frequency;

[0012] if the current frequency difference is greater than the preset frequency, controlling adjustment of the output power of the adjustable small power source until the current frequency difference is less than or equal to the preset frequency; and if the current frequency difference is less than or equal to the preset frequency, determining whether the current voltage difference meets a preset condition;

[0013] In a case where it is determined that the current voltage difference does not satisfy the preset condition, the number of voltage regulating elements of the voltage regulating element group connected to the second substation is adjusted until the current voltage difference satisfies the preset condition; in a case where it is determined that the current voltage difference satisfies the preset condition, it is determined that the reclosing of the second substation satisfies the synchronization checking condition.

[0014] Optionally, in another possible design, the above-mentioned "controlling the output power of the adjustable small power supply until the current frequency difference is less than or equal to the preset frequency" can include:

[0015] controlling the output power of the adjustable small power supply until the current frequency difference is less than or equal to the preset frequency based on the current power difference between the bus of the second substation and the main supply line, the current load difference between the bus of the second substation and the main supply line, the current frequency difference, and a preset regulating coefficient.

[0016] Optionally, in another possible design, the voltage regulating element group includes at least N capacitors, and N is a positive integer; the above-mentioned "controlling the number of voltage regulating elements of the voltage regulating element group connected to the second substation until the current voltage difference satisfies the preset condition" can include:

[0017] determining whether the voltage of the bus of the second substation is higher than the voltage of the main supply line;

[0018] if it is determined that the voltage of the bus of the second substation is higher than the voltage of the main supply line, the number of capacitors of the N capacitors connected to the second substation is sequentially reduced until the current voltage difference satisfies the preset condition;

[0019] if it is determined that the voltage of the bus of the second substation is lower than the voltage of the main supply line, the number of capacitors of the N capacitors connected to the second substation is sequentially increased until the current voltage difference satisfies the preset condition.

[0020] Optionally, in another possible design, the voltage regulating element group includes at least M reactors, and M is a positive integer; the above-mentioned "controlling the number of voltage regulating elements of the voltage regulating element group connected to the second substation until the current voltage difference satisfies the preset condition" can include:

[0021] determining whether the voltage of the bus of the second substation is higher than the voltage of the main supply line;

[0022] if it is determined that the voltage of the bus of the second substation is higher than the voltage of the main supply line, the number of reactors of the M reactors connected to the second substation is sequentially increased until the current voltage difference satisfies the preset condition;

[0023] if it is determined that the voltage of the bus of the second substation is lower than the voltage of the main supply line, the number of reactors of the M reactors connected to the second substation is sequentially reduced until the current voltage difference satisfies the preset condition.

[0024] In a second aspect, the present application provides a starting device of reclosing, comprising: a control adjustment module and a control starting module;

[0025] The control adjustment module is configured to, in a case where it is determined that the main supply line between the first substation and the second substation is faulty, control adjustment of the output power of the adjustable small power supply and / or control adjustment of the number of voltage regulating elements in the voltage regulating element group connected to the second substation, until the reclosing at the second substation side of the main supply line meets the synchronization check condition; wherein the first substation contains a large power supply for providing a main power supply to the second substation; the adjustable small power supply is configured to provide a secondary power supply to the second substation; and the voltage regulating element group is configured to regulate the voltage of the bus of the second substation.

[0026] The control starting module is configured to, if it is determined that the reclosing at the second substation side meets the synchronization check condition, control the starting of the reclosing at the second substation side.

[0027] Optionally, in a possible design, the control adjustment module is specifically configured to:

[0028] In a case where it is determined that the main supply line between the first substation and the second substation is faulty, control adjustment of the output power of the adjustable small power supply based on the current frequency difference between the bus of the second substation and the main supply line, and / or control adjustment of the number of voltage regulating elements in the voltage regulating element group connected to the second substation based on the current voltage difference between the bus of the second substation and the main supply line, until the reclosing at the second substation side meets the synchronization check condition.

[0029] Optionally, in another possible design, the control adjustment module is specifically further configured to:

[0030] In a case where it is determined that the main supply line between the first substation and the second substation is faulty, determine whether the current frequency difference is greater than a preset frequency.

[0031] If the current frequency difference is greater than the preset frequency, control adjustment of the output power of the adjustable small power supply until the current frequency difference is less than or equal to the preset frequency; and if the current frequency difference is less than or equal to the preset frequency, determine whether the current voltage difference meets a preset condition.

[0032] In a case where it is determined that the current voltage difference does not meet the preset condition, control adjustment of the number of voltage regulating elements in the voltage regulating element group connected to the second substation until the current voltage difference meets the preset condition; and in a case where it is determined that the current voltage difference meets the preset condition, determine that the reclosing at the second substation side meets the synchronization check condition.

[0033] Optionally, in another possible design, the control adjustment module is specifically further configured to:

[0034] If the current frequency difference is greater than the preset frequency, based on the current power difference between the bus of the second substation and the main supply line, the current load difference between the bus of the second substation and the main supply line, the current frequency difference and the preset adjustment coefficient, the output power of the adjustable small power supply is controlled and adjusted until the current frequency difference is less than or equal to the preset frequency.

[0035] Optionally, in another possible design, the voltage regulating element group at least includes N capacitors, N being a positive integer; and the control and adjustment module is specifically further configured to:

[0036] In a case where it is determined that the current voltage difference does not satisfy the preset condition, it is determined whether the voltage of the bus of the second substation is higher than the voltage of the main supply line;

[0037] If it is determined that the voltage of the bus of the second substation is higher than the voltage of the main supply line, the number of the capacitors connected to the second substation in the N capacitors is sequentially reduced until the current voltage difference satisfies the preset condition;

[0038] If it is determined that the voltage of the bus of the second substation is lower than the voltage of the main supply line, the number of the capacitors connected to the second substation in the N capacitors is sequentially increased until the current voltage difference satisfies the preset condition.

[0039] Optionally, in another possible design, the voltage regulating element group at least includes M reactors, M being a positive integer; and the control and adjustment module is specifically further configured to:

[0040] In a case where it is determined that the current voltage difference does not satisfy the preset condition, it is determined whether the voltage of the bus of the second substation is higher than the voltage of the main supply line;

[0041] If it is determined that the voltage of the bus of the second substation is higher than the voltage of the main supply line, the number of the reactors connected to the second substation in the M reactors is sequentially increased until the current voltage difference satisfies the preset condition;

[0042] If it is determined that the voltage of the bus of the second substation is lower than the voltage of the main supply line, the number of the reactors connected to the second substation in the M reactors is sequentially reduced until the current voltage difference satisfies the preset condition.

[0043] In a third aspect, the present application provides a starting device for reclosing, comprising a memory, a processor, a bus and a communication interface; the memory is used for storing computer execution instructions, the processor is connected with the memory through the bus; when the starting device for reclosing runs, the processor executes the computer execution instructions stored in the memory, so that the starting device for reclosing executes the starting method for reclosing provided in the first aspect.

[0044] In a fourth aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores instructions, and when the instructions are executed by a computer, the computer executes the starting method of the reclosing provided in the first aspect.

[0045] In a fifth aspect, the present application provides a computer program product, which comprises computer instructions, and when the computer instructions are executed on a computer, the computer executes the starting method of the reclosing provided in the first aspect.

[0046] In a sixth aspect, the present application provides a power system, which comprises a first substation, a second substation, an adjustable small power source, a voltage regulating element group, and the starting device of the reclosing provided in the third aspect.

[0047] It should be noted that the above computer instructions can be stored on the computer readable storage medium in whole or in part. The computer readable storage medium can be packaged together with the processor of the starting device of the reclosing or packaged separately from the processor of the starting device of the reclosing, and the present application does not limit this.

[0048] The description of the second aspect, the third aspect, the fourth aspect, the fifth aspect and the sixth aspect in the present application can refer to the detailed description of the first aspect, and the beneficial effects of the description of the second aspect, the third aspect, the fourth aspect, the fifth aspect and the sixth aspect can refer to the beneficial effect analysis of the first aspect, which will not be repeated here.

[0049] In the present application, the names of the above-mentioned devices or functional modules do not constitute a limitation, and in actual implementation, these devices or functional modules can appear in other names. As long as the functions of each device or functional module are similar to those of the present application, they are within the scope of the claims of the present application and equivalent technologies.

[0050] These aspects or other aspects of the present application will be more apparent in the following description. BRIEF DESCRIPTION OF DRAWINGS

[0051] Figure 1 A partial wiring schematic diagram of a distribution network line provided by an embodiment of the present application;

[0052] Figure 2 A flowchart of a starting method of reclosing provided by an embodiment of the present application;

[0053] Figure 3 A flowchart of another starting method of reclosing provided by an embodiment of the present application;

[0054] Figure 4 A structural schematic diagram of a starting device of reclosing provided by an embodiment of the present application;

[0055] Figure 5 A structure diagram of a starting device of a reclosing device is provided in the embodiments of the present application. DETAILED DESCRIPTION

[0056] The reclosing method, device, equipment, storage medium and power system provided by the embodiments of the present application are described in detail below with reference to the drawings.

[0057] The term "and / or" in this document merely describes an association relationship of associated objects, and indicates that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone.

[0058] The terms "first" and "second" and the like in the description of the present application and the drawings are used to distinguish different objects or different treatments of the same object, and are not used to describe a specific order of the objects.

[0059] In addition, the terms "include" and "have" and any variations thereof mentioned in the description of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0060] It should be noted that in the embodiments of the present application, the words "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be construed as being more preferred or having more advantages than other embodiments or design schemes. Rather, the use of "exemplary" or "for example" is intended to present relevant concepts in a concrete manner.

[0061] In the description of the present application, "a plurality of" means two or more, unless otherwise specified.

[0062] In addition, the acquisition, storage, use, processing and the like of data in the technical solutions of the present application comply with the relevant provisions of national laws and regulations.

[0063] During the operation of overhead lines, transient faults often occur, and timely restoration of line operation can avoid long-term power outage accidents. The use of reclosing can meet the reliability requirements of line operation. There are three common reclosing starting modes, which are line voltage detection, bus voltage detection, and synchronization detection. For the reclosing of a small power grid connected to a substation, the synchronization detection reclosing starting mode is generally used.

[0064] However, since the small power supply generally does not have a low-voltage low-frequency tripping function, when a fault occurs in the main supply line between the grid-connected substation with a small power supply and the substation providing the main power supply to the grid-connected substation with a small power supply, the small power supply of the grid-connected substation with a small power supply can still bring part of the load through its own output, supporting the voltage of the grid-connected substation with a small power supply. At this time, the grid-connected substation with a small power supply side and the main supply line side will lose synchronization, resulting in that the reclosing of the grid-connected substation with a small power supply side cannot meet the synchronization check condition, causing the reclosing to fail to start. Therefore, how to improve the success rate of the start of the reclosing of the grid-connected substation with a small power supply side has become a problem to be solved.

[0065] For example, referring to Figure 1 , a partial wiring schematic diagram of a distribution network line is provided. As shown in Figure 1 , the A station is a substation with a large power supply, which can provide a large power supply to the B station; the C power plant is an adjustable output power plant, which can provide a small power supply to the B station. If a short-circuit three-phase trip occurs on the 110kV AB line, the reclosing a can use a starting mode of checking that the line voltage is zero and the bus voltage is not zero, that is, when it is detected that the line voltage corresponding to the 110kV AB line is zero, but the 110kV #1 bus voltage a is not zero, the reclosing a can be closed first. If the B station is a grid-connected substation without a small power supply (that is, the reclosing c is in an open state or the actual wiring diagram does not contain the part in the dashed box in Figure 1 , the reclosing b can use a starting mode of checking that the bus voltage is zero and the line voltage is not zero, that is, when it is detected that the line voltage corresponding to the 110kV AB line is not zero (at this time, since the reclosing a is closed first, the 110kV AB line has voltage), but the 110kV #1 bus voltage b is zero, the reclosing b can be closed again, so that the 110kV AB line can resume normal operation.

[0066] If the B station is a grid-connected substation with a small power supply (the reclosing c is in a closed state and the actual wiring diagram contains the part in the dashed box in Figure 1 , the reclosing b can use a synchronization check mode, that is, when it is detected that the line voltage corresponding to the 110kV AB line is not zero and the 110kV #1 bus voltage b is not zero, and the synchronization check condition is met (that is, the voltage difference and the angle difference between the two sides and other parameters meet certain conditions, the specific synchronization check condition can refer to the related description in the prior art, which will not be described here), the reclosing b can be closed again, so that the 110kV AB line can resume normal operation. However, since the C power plant generally does not have a low-voltage low-frequency tripping function, when the reclosing b uses the synchronization check mode, the line corresponding to the 110kV AB line and the 110kV #1 bus voltage b on both sides will lose synchronization, resulting in that the reclosing b cannot meet the synchronization check condition, causing the reclosing to fail to start.

[0067] To solve the problems in the prior art, the embodiment of the present application provides a starting method of reclosing, which can synchronize the frequencies on both sides by automatically adjusting the output power of the adjustable small power supply when the main supply line between the first substation and the second substation fails, and / or synchronize the voltages on both sides by automatically adjusting the number of voltage regulating elements of the voltage regulating element group connected to the second substation, so as to improve the probability of meeting the reclosing conditions, thereby improving the success rate of starting the reclosing on the second substation side, that is, improving the success rate of starting the reclosing on the grid-connected substation side with the small power supply.

[0068] The starting method of reclosing provided by the embodiment of the present application can be executed by the starting device of reclosing provided by the embodiment of the present application, which can be implemented in the form of software and / or hardware and integrated in the starting device of reclosing that executes the method.

[0069] The starting method of reclosing provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0070] With reference to Figure 2 , the starting method of reclosing provided by the embodiment of the present application comprises S201-S202.

[0071] S201, in the case where it is determined that the main supply line between the first substation and the second substation fails, the output power of the adjustable small power supply is controlled to be adjusted and / or the number of voltage regulating elements of the voltage regulating element group connected to the second substation is controlled to be adjusted, until the reclosing on the second substation side of the main supply line meets the reclosing conditions.

[0072] The first substation contains a large power supply for providing a main power supply to the second substation, an adjustable small power supply for providing a secondary power supply to the second substation, and a voltage regulating element group that can include a plurality of voltage regulating elements for regulating the voltage of the bus of the second substation, and optionally, the voltage regulating element group can include voltage regulating elements of different types. For example, as shown in the partial wiring diagram, Figure 1 , the first substation can be Figure 1 , the second substation can be Figure 1 , the adjustable small power supply can be Figure 1 , the voltage regulating element group can be connected to the right side of the 10kV#1 bus. The main supply line between the first substation and the second substation can be Figure 1 , the reclosing on the second substation side of the main supply line can be Figure 1 , the reclosing on the second substation side of the main supply line can be

[0073] It can be understood that the starting method of the reclosing provided by the embodiments of the present application is applied to the starting of the reclosing at the side of the power station with small power connected to the grid. It should be noted that the embodiments of the present application default to start the reclosing b) in the Figure 1 before starting the reclosing a) in the Figure 3 at the side of the main power supply line.

[0074] Optionally, the control adjustment of the output power of the adjustable small power and / or the control adjustment of the number of the voltage regulating elements connected to the second power station in the voltage regulating element group until the reclosing at the side of the second power station on the main power supply line satisfies the synchronization checking condition can comprise: controlling the adjustment of the output power of the adjustable small power based on the current frequency difference between the bus of the second power station and the main power supply line, and / or controlling the adjustment of the number of the voltage regulating elements connected to the second power station in the voltage regulating element group based on the current voltage difference between the bus of the second power station and the main power supply line until the reclosing at the side of the second power station satisfies the synchronization checking condition.

[0075] Optionally, the control adjustment of the output power of the adjustable small power based on the current frequency difference between the bus of the second power station and the main power supply line, and / or the control adjustment of the number of the voltage regulating elements connected to the second power station in the voltage regulating element group based on the current voltage difference between the bus of the second power station and the main power supply line until the reclosing at the side of the second power station satisfies the synchronization checking condition can comprise: determining whether the current frequency difference is greater than a preset frequency; if the current frequency difference is greater than the preset frequency, controlling the adjustment of the output power of the adjustable small power until the current frequency difference is less than or equal to the preset frequency; if the current frequency difference is less than or equal to the preset frequency, determining whether the current voltage difference satisfies a preset condition; in the case of determining that the current voltage difference does not satisfy the preset condition, controlling the adjustment of the number of the voltage regulating elements connected to the second power station in the voltage regulating element group until the current voltage difference satisfies the preset condition; in the case of determining that the current voltage difference satisfies the preset condition, determining that the reclosing at the side of the second power station satisfies the synchronization checking condition.

[0076] The preset frequency can be a frequency determined in advance. For example, the preset frequency can be 0.2 HZ.

[0077] The preset condition can be a condition determined in advance. For example, the preset condition can be that the current voltage difference between the bus of the second power station and the main power supply line is less than a set voltage value, or the current voltage difference is less than a preset percentage of the voltage of the main power supply line. For example, the preset condition can be that the current voltage difference is less than 20% of the voltage of the main power supply line.

[0078] Since the current voltage difference will be changed in the process of adjusting the output power of the adjustable small power supply to adjust the current frequency difference, the embodiment of the present application can first synchronize the frequencies on both sides by automatically adjusting the output power of the adjustable small power supply, and then synchronize the voltages on both sides by automatically adjusting the number of voltage regulating elements of the voltage regulating element group connected to the second substation, so as to avoid repeatedly adjusting the current frequency difference and the current voltage difference.

[0079] Optionally, the control of adjusting the output power of the adjustable small power supply until the current frequency difference is less than or equal to the preset frequency can include: based on the current power difference between the bus of the second substation and the main supply line, the current load difference between the bus of the second substation and the main supply line, the current frequency difference and the preset adjustment coefficient, the control of adjusting the output power of the adjustable small power supply until the current frequency difference is less than or equal to the preset frequency.

[0080] The preset adjustment coefficient can be a value determined in advance according to the grid parameters.

[0081] For example, if PG1 represents the active power output by the main supply line and PG2 represents the output power of the adjustable small power supply, the current power difference ΔPG between the bus of the second substation and the main supply line is PG2-PG1. Then, PG2 can be adjusted based on the expression ΔPG=ΔPD0+KΔf until the current frequency difference is less than or equal to the preset frequency. Wherein, ΔPD0 represents the current load difference between the bus of the second substation and the main supply line, Δf represents the current frequency difference between the bus of the second substation and the main supply line, and K represents the preset adjustment coefficient.

[0082] Optionally, the voltage regulating element group includes at least N capacitors, and N is a positive integer; the control of adjusting the number of voltage regulating elements connected to the second substation in the voltage regulating element group until the current voltage difference meets the preset condition includes: determining whether the voltage of the bus of the second substation is higher than the voltage of the main supply line; if it is determined that the voltage of the bus of the second substation is higher than the voltage of the main supply line, then the number of capacitors connected to the second substation in the N capacitors is sequentially reduced until the current voltage difference meets the preset condition; if it is determined that the voltage of the bus of the second substation is lower than the voltage of the main supply line, then the number of capacitors connected to the second substation in the N capacitors is sequentially increased until the current voltage difference meets the preset condition.

[0083] Since the connection of the capacitor on the second substation side can increase the voltage on the second substation side, the embodiment of the present application can increase or decrease the number of capacitors connected to the second substation until the current voltage difference meets the preset condition.

[0084] Optionally, the voltage regulating element group at least comprises M reactors, M being a positive integer; the number of voltage regulating elements in the voltage regulating element group connected to the second substation is adjusted until the current voltage difference meets the preset condition, including: determining whether the voltage of the bus of the second substation is higher than the voltage of the main supply line; if it is determined that the voltage of the bus of the second substation is higher than the voltage of the main supply line, the number of reactors connected to the second substation in the M reactors is sequentially increased until the current voltage difference meets the preset condition; if it is determined that the voltage of the bus of the second substation is lower than the voltage of the main supply line, the number of reactors connected to the second substation in the M reactors is sequentially decreased until the current voltage difference meets the preset condition.

[0085] Since the connection of the reactor at the second substation side can reduce the voltage at the second substation side, the embodiment of the present application can increase or decrease the number of reactors connected to the second substation until the current voltage difference meets the preset condition.

[0086] S202, if it is determined that the reclosing at the second substation side meets the synchronization checking condition, the reclosing at the second substation side is started.

[0087] In summary, in the reclosing starting method provided by the embodiment of the present application, the second substation is a small power source grid-connected substation, the first substation containing a large power source can provide a main power source to the second substation, and the adjustable small power source can provide a secondary power source to the second substation. When the main supply line between the first substation and the second substation fails, the adjustable small power source can carry part of the load of the second substation by its own output, which may cause the second substation side and the main supply line side to lose synchronization, resulting in the reclosing at the second substation side failing to meet the synchronization checking condition. The reason why the second substation side and the main supply line side lose synchronization and fail to meet the synchronization checking condition may be that the frequencies of the two sides are out of synchronization, or it may be that the voltages of the two sides are out of synchronization. Therefore, the present application can automatically adjust the output power of the adjustable small power source to synchronize the frequencies of the two sides, and / or automatically adjust the number of voltage regulating elements in the voltage regulating element group connected to the second substation to synchronize the voltages of the two sides when the main supply line fails, which can improve the probability of meeting the synchronization checking condition, thereby improving the success rate of the reclosing starting at the second substation side, that is, the success rate of the reclosing starting at the small power source grid-connected substation side.

[0088] Optionally, as shown in Figure 4 The embodiment of the present application also provides a reclosing starting method, including S301-S308:

[0089] S301, determining that the main supply line between the first substation and the second substation fails.

[0090] S302. Determine whether the current frequency difference between the busbar of the second substation and the main power supply line is greater than the preset frequency.

[0091] If the current frequency difference is greater than the preset frequency, then proceed to step S303; if the current frequency difference is less than or equal to the preset frequency, then proceed to step S304.

[0092] S303. Based on the current power difference between the busbar and the main power supply line of the second substation, the current load difference between the busbar and the main power supply line of the second substation, the current frequency difference, and the preset adjustment coefficient, control and adjust the output power of the adjustable small power supply.

[0093] After step S303, return to step S302.

[0094] S304. Determine whether the current voltage difference between the busbar of the second substation and the main power supply line meets the preset conditions.

[0095] If it is determined that the current voltage difference does not meet the preset conditions, proceed to step S305; if it is determined that the current voltage difference meets the preset conditions, proceed to step S308.

[0096] S305. Determine whether the voltage of the busbar of the second substation is higher than the voltage of the main power supply line.

[0097] If it is determined that the voltage of the busbar of the second substation is higher than the voltage of the main power supply line, then step S306 is executed; if it is determined that the voltage of the busbar of the second substation is lower than the voltage of the main power supply line, then step S307 is executed.

[0098] S306. Reduce one capacitor connected to the second substation or add one reactor connected to the second substation.

[0099] After step S306, return to step S304.

[0100] S307. Add a capacitor connected to the second substation or remove a reactor connected to the second substation.

[0101] After step S307, return to step S304.

[0102] S308. Determine that the reclosing on the second substation side meets the synchronization conditions, and control the reclosing on the second substation side to start.

[0103] like Figure 5 As shown in the figure, this application embodiment also provides a reclosing start device, which may include: a control adjustment module 11 and a control start module 21.

[0104] The control adjustment module 11 is configured to perform S201 in the method embodiments, and the control starting module 21 is configured to perform S202 in the method embodiments.

[0105] Specifically, the control adjustment module 11 is configured to, in a case where it is determined that the main supply line between the first transformer substation and the second transformer substation fails, control adjustment of the output power of the adjustable small power supply and / or control adjustment of the number of voltage regulating elements in the voltage regulating element group that are connected to the second transformer substation, until the reclosing at the second transformer substation side of the main supply line meets the synchronization check condition; the first transformer substation contains a large power supply, and is configured to provide main power supply to the second transformer substation; the adjustable small power supply is configured to provide auxiliary power supply to the second transformer substation; and the voltage regulating element group is configured to regulate the voltage of the bus of the second transformer substation.

[0106] The control starting module 21 is configured to, if it is determined that the reclosing at the second transformer substation side meets the synchronization check condition, control the reclosing at the second transformer substation side to start.

[0107] Optionally, in a possible design, the control adjustment module 11 is specifically configured to:

[0108] In a case where it is determined that the main supply line between the first transformer substation and the second transformer substation fails, the output power of the adjustable small power supply is controlled and adjusted based on the current frequency difference between the bus of the second transformer substation and the main supply line, and / or the number of voltage regulating elements in the voltage regulating element group that are connected to the second transformer substation is controlled and adjusted based on the current voltage difference between the bus of the second transformer substation and the main supply line, until the reclosing at the second transformer substation side meets the synchronization check condition.

[0109] Optionally, in another possible design, the control adjustment module 11 is specifically further configured to:

[0110] In a case where it is determined that the main supply line between the first transformer substation and the second transformer substation fails, it is determined whether the current frequency difference is greater than a preset frequency.

[0111] If the current frequency difference is greater than the preset frequency, the output power of the adjustable small power supply is controlled and adjusted until the current frequency difference is less than or equal to the preset frequency; and if the current frequency difference is less than or equal to the preset frequency, it is determined whether the current voltage difference meets a preset condition.

[0112] In a case where it is determined that the current voltage difference does not meet the preset condition, the number of voltage regulating elements in the voltage regulating element group that are connected to the second transformer substation is controlled and adjusted until the current voltage difference meets the preset condition; and in a case where it is determined that the current voltage difference meets the preset condition, it is determined that the reclosing at the second transformer substation side meets the synchronization check condition.

[0113] Optionally, in another possible design, the control adjustment module 11 is specifically further configured to:

[0114] If the current frequency difference is greater than the preset frequency, the output power of the adjustable small power supply will be controlled and adjusted until the current frequency difference is less than or equal to the preset frequency, based on the current power difference between the busbar of the second substation and the main power supply line, the current load difference between the busbar of the second substation and the main power supply line, the current frequency difference, and the preset adjustment coefficient.

[0115] Optionally, in another possible design, the voltage regulation element group includes at least N capacitors, where N is a positive integer; the control adjustment module 11 is further used for:

[0116] If it is determined that the current voltage difference does not meet the preset conditions, determine whether the voltage of the busbar of the second substation is higher than the voltage of the main power supply line;

[0117] If it is determined that the voltage of the busbar of the second substation is higher than the voltage of the main power supply line, then the number of capacitors connected to the second substation among the N capacitors will be reduced in turn until the current voltage difference meets the preset condition.

[0118] If it is determined that the voltage of the busbar of the second substation is lower than the voltage of the main power supply line, then the number of capacitors connected to the second substation among the N capacitors is increased sequentially until the current voltage difference meets the preset condition.

[0119] Optionally, in another possible design, the voltage regulation element group includes at least M reactors, where M is a positive integer; the control adjustment module 11 is further used for:

[0120] If it is determined that the current voltage difference does not meet the preset conditions, determine whether the voltage of the busbar of the second substation is higher than the voltage of the main power supply line;

[0121] If it is determined that the voltage of the busbar of the second substation is higher than the voltage of the main power supply line, then the number of reactors connected to the second substation among the M reactors will be increased sequentially until the current voltage difference meets the preset condition.

[0122] If it is determined that the voltage of the busbar of the second substation is lower than the voltage of the main power supply line, then the number of reactors connected to the second substation among the M reactors will be reduced sequentially until the current voltage difference meets the preset condition.

[0123] Optionally, the reclosing initiation device may also include a storage module for storing the program code of the reclosing initiation device.

[0124] like Figure 5 As shown, this application embodiment also provides a reclosing start device, including a memory 41 and a processor (e.g., Figure 5The bus 43 and the communication interface 44; the memory 41 is used to store computer execution instructions, the processor is connected with the memory 41 through the bus 43; when the reclosing starting device is running, the processor executes the computer execution instructions stored in the memory 41, so that the reclosing starting device executes the reclosing starting method provided by the above-mentioned embodiments.

[0125] In a specific implementation, as an embodiment, the processor can include one or more central processing units (CPUs), such as the CPU0 and the CPU1 shown in FIG. 42-1 and 42-2. Figure 5 In a specific implementation, as an embodiment, the reclosing starting device can include a plurality of processors, such as the processor 42-1 and the processor 42-2 shown in FIG. 42-1 and 42-2. Figure 5 Each CPU in these processors can be a single-CPU or a multi-CPU. Here, the processor can refer to one or more devices, circuits, and / or processing cores for processing data (for example, computer program instructions).

[0126] The memory 41 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, a magneto-optical disk, a magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this. The memory 41 can exist independently and be connected with the processor through the bus 43. The memory 41 can also be integrated with the processor.

[0127] In a specific implementation, the memory 41 is used to store data in the present application and computer execution instructions corresponding to software programs for executing the present application. The processor can execute various functions of the reclosing starting device by running or executing the software programs stored in the memory 41 and calling the data stored in the memory 41.

[0128] The communication interface 44, using any transceiver-like device, is used to communicate with other devices or communication networks, such as a control system, a radio access network (RAN), a wireless local area network (WLAN), etc. The communication interface 44 can include a receiving unit to implement the receiving function and a sending unit to implement the sending function.

[0129] The bus 43 can be an industry standard architecture (ISA) bus, a peripheral component interconnect (PCI) bus, an extended industry standard architecture (EISA) bus, etc. The bus 43 can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 4 Only one thick line is used in the figure to represent the bus, but it does not mean that there is only one bus or only one type of bus.

[0130] As an example, in combination with Figure 5 The functions implemented by the control starting module in the starting device of the reclosing are the same as the functions implemented by the processor in Figure 5 When the starting device of the reclosing includes a storage module, the functions implemented by the storage module are the same as the functions implemented by the memory in Figure 1 .

[0131] The explanation of the related content in the embodiment can refer to the above method embodiment, which will not be repeated here.

[0132] Through the description of the above embodiments, those skilled in the art can clearly understand that, for the convenience and brevity of description, only the above division of functional modules is taken as an example for illustration, and in actual application, the above functions can be completed by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the above described functions. The specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

[0133] The embodiment of the present application also provides a computer readable storage medium, which stores instructions, when the computer executes the instructions, the computer executes the reclosing starting method provided by the above embodiment.

[0134] The computer readable storage medium, for example, can be, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a RAM, a ROM, an erasable programmable read-only memory (EPROM), a register, a hard disk, an optical fiber, a CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing, or any other medium from which a computer can read instructions. The exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. Of course, the storage medium can be a part of the processor. The processor and the storage medium can be located in an application specific integrated circuit (ASIC). In the embodiments of the present application, the computer readable storage medium can be any tangible medium that contains or stores a program used by or in connection with an instruction execution system, apparatus, or device.

[0135] The embodiments of the present application also provide a power system, which can include a first substation, a second substation, an adjustable small power source, a voltage regulation element group, and a reclosing starting device for executing the reclosing starting method as described above.

[0136] It can be understood that in actual applications, the lines in the power system are more complex, and the number of the substation and the small power source contained is more, which are not limited in the embodiments of the present application. For example, the power system can further include a plurality of small hydropower stations. ​ As shown in the partial wiring diagram, a plurality of small hydropower stations can be connected to the lower side of the 35kV#1 bus, which can provide small power sources for the B substation and can also supply power to the connected users.

[0137] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any change or replacement within the technical scope disclosed in the present application should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of starting a reclosing, characterized by, The application relates to a method for controlling a power supply system, comprising: in the case of determining that a main supply line between a first transformer substation and a second transformer substation is faulty, controlling adjustment of output power of an adjustable small power supply and / or controlling adjustment of the number of voltage regulating elements of a voltage regulating element group connected to the second transformer substation, until reclosing of the second transformer substation side of the main supply line meets a synchronization checking condition; wherein the first transformer substation contains a large power supply for providing main power supply to the second transformer substation; the adjustable small power supply is used for providing auxiliary power supply to the second transformer substation; and the voltage regulating element group is used for regulating voltage of a bus of the second transformer substation; if it is determined that the reclosing of the second transformer substation side meets the synchronization checking condition, controlling the reclosing of the second transformer substation side to start; the controlling adjustment of the output power of the adjustable small power supply and / or the controlling adjustment of the number of voltage regulating elements of the voltage regulating element group connected to the second transformer substation until the reclosing of the second transformer substation side of the main supply line meets the synchronization checking condition, comprising: first automatically adjusting the output power of the adjustable small power supply to make the frequency of the second transformer substation side meet a preset frequency, and then automatically adjusting the number of voltage regulating elements of the voltage regulating element group connected to the second transformer substation to make the voltage of the second transformer substation side meet a preset condition; wherein the voltage regulating element group at least comprises N capacitors, and N is a positive integer; the controlling adjustment of the number of voltage regulating elements of the voltage regulating element group connected to the second transformer substation until the current voltage difference meets the preset condition comprises: determining whether the voltage of the bus of the second transformer substation is higher than the voltage of the main supply line; if it is determined that the voltage of the bus of the second transformer substation is higher than the voltage of the main supply line, the number of capacitors of the N capacitors connected to the second transformer substation is sequentially reduced until the current voltage difference meets the preset condition; if it is determined that the voltage of the bus of the second transformer substation is lower than the voltage of the main supply line, the number of capacitors of the N capacitors connected to the second transformer substation is sequentially increased until the current voltage difference meets the preset condition; and / or; the voltage regulating element group at least comprises M reactors, and M is a positive integer; the controlling adjustment of the number of voltage regulating elements of the voltage regulating element group connected to the second transformer substation until the current voltage difference meets the preset condition comprises: determining whether the voltage of the bus of the second transformer substation is higher than the voltage of the main supply line; if it is determined that the voltage of the bus of the second transformer substation is higher than the voltage of the main supply line, the number of reactors of the M reactors connected to the second transformer substation is sequentially increased until the current voltage difference meets the preset condition; if it is determined that the voltage of the bus of the second transformer substation is lower than the voltage of the main supply line, the number of reactors of the M reactors connected to the second transformer substation is sequentially reduced until the current voltage difference meets the preset condition.

2. The method of starting a reclosing circuit breaker according to claim 1, characterized in that, the controlling adjustment of the output power of the adjustable small power supply and / or the controlling adjustment of the number of voltage regulating elements of the voltage regulating element group connected to the second transformer substation until the reclosing of the second transformer substation side of the main supply line meets the synchronization checking condition, comprising: The output power of the adjustable small power supply is controlled and adjusted based on the current frequency difference between the bus of the second substation and the main supply line, and / or the number of voltage regulating elements connected to the second substation in the voltage regulating element group is controlled and adjusted based on the current voltage difference between the bus of the second substation and the main supply line, until the reclosing on the second substation side meets the synchronization check condition.

3. The method of starting a reclosing circuit breaker according to claim 2, characterized in that, The output power of the adjustable small power supply is controlled and adjusted based on the current frequency difference between the bus of the second substation and the main supply line, and / or the number of voltage regulating elements connected to the second substation in the voltage regulating element group is controlled and adjusted based on the current voltage difference between the bus of the second substation and the main supply line, until the reclosing on the second substation side meets the synchronization check condition, including: determining whether the current frequency difference is greater than a preset frequency; if the current frequency difference is greater than the preset frequency, controlling and adjusting the output power of the adjustable small power supply until the current frequency difference is less than or equal to the preset frequency; if the current frequency difference is less than or equal to the preset frequency, determining whether the current voltage difference meets a preset condition; if it is determined that the current voltage difference does not meet the preset condition, controlling and adjusting the number of voltage regulating elements connected to the second substation in the voltage regulating element group until the current voltage difference meets the preset condition; if it is determined that the current voltage difference meets the preset condition, determining that the reclosing on the second substation side meets the synchronization check condition.

4. The method of starting a reclosing circuit breaker according to claim 3, characterized in that, The output power of the adjustable small power supply is controlled and adjusted based on the current frequency difference between the bus of the second substation and the main supply line, and / or the number of voltage regulating elements connected to the second substation in the voltage regulating element group is controlled and adjusted based on the current voltage difference between the bus of the second substation and the main supply line, until the reclosing on the second substation side meets the synchronization check condition, including: controlling and adjusting the output power of the adjustable small power supply until the current frequency difference is less than or equal to the preset frequency based on the current power difference between the bus of the second substation and the main supply line, the current load difference between the bus of the second substation and the main supply line, the current frequency difference, and a preset adjustment coefficient.

5. A starting device for reclosing, characterized in that including: The control adjustment module is configured to, in a case where it is determined that a fault occurs in the main supply line between the first substation and the second substation, control and adjust the output power of the adjustable small power supply and / or control and adjust the number of voltage regulating elements connected to the second substation in the voltage regulating element group, until the reclosing on the second substation side of the main supply line meets the synchronization check condition; the first substation contains a large power supply for providing a main power supply to the second substation; the adjustable small power supply is configured to provide a secondary power supply to the second substation; and the voltage regulating element group is configured to regulate the voltage of the bus of the second substation. The control starting module is configured to, if it is determined that the reclosing on the second substation side meets the synchronization check condition, control the reclosing on the second substation side to start. The control adjustment module is further configured to automatically adjust the output power of the adjustable small power supply first to make the frequency on the second substation side meet a preset frequency, and then automatically adjust the number of voltage regulating elements connected to the second substation in the voltage regulating element group to make the voltage on the second substation side meet a preset condition. The voltage regulating element group at least includes N capacitors, N being a positive integer; the control adjustment module is further configured to: in a case where the current voltage difference does not satisfy the preset condition, determine whether the voltage of the bus of the second substation is higher than the voltage of the main supply line; if it is determined that the voltage of the bus of the second substation is higher than the voltage of the main supply line, sequentially reduce the number of the capacitors connected to the second substation in the N capacitors until the current voltage difference satisfies the preset condition; if it is determined that the voltage of the bus of the second substation is lower than the voltage of the main supply line, sequentially increase the number of the capacitors connected to the second substation in the N capacitors until the current voltage difference satisfies the preset condition. and / or The voltage regulating element group at least includes M reactors, M being a positive integer; the control adjustment module is further configured to: in a case where the current voltage difference does not satisfy the preset condition, determine whether the voltage of the bus of the second substation is higher than the voltage of the main supply line; if it is determined that the voltage of the bus of the second substation is higher than the voltage of the main supply line, sequentially increase the number of the reactors connected to the second substation in the M reactors until the current voltage difference satisfies the preset condition; if it is determined that the voltage of the bus of the second substation is lower than the voltage of the main supply line, sequentially reduce the number of the reactors connected to the second substation in the M reactors until the current voltage difference satisfies the preset condition.

6. A starting device for reclosing, characterized in that comprises a memory, a processor, a bus and a communication interface; the memory is used to store computer execution instructions, the processor is connected with the memory through the bus; When the reclosing starting device is running, the processor executes the computer execution instructions stored in the memory, so that the reclosing starting device executes the reclosing starting method according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium stores instructions, when the computer executes the instructions, the computer executes the reclosing starting method according to any one of claims 1-4.

8. A power system, characterized by comprises a first substation, a second substation, an adjustable small power supply, a voltage regulating element group and the reclosing starting device according to claim 6.

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