Transformer area voltage control method, transformer area interconnection system and energy storage system

Abstract

The embodiment of the invention provides a transformer area voltage control method, a transformer area interconnection system and an energy storage system. Relates to the technical field of micro-grid control. The method comprises the following steps: determining whether first real-time operation power of a plurality of transformer areas exceeds preset maximum operation power or preset minimum operation power of the corresponding transformer areas; if the first real-time operation power exceeds the preset maximum operation power, determining required transfer power according to the preset maximum operation power, the first real-time operation power and the second real-time operation power; if the first real-time operation power exceeds the preset minimum operation power, determining required transfer power according to the preset minimum operation power, the first real-time operation power and the second real-time operation power; according to the required wheeling power, determining expected wheeling power of the flexible interconnection devices corresponding to other transformer areas; and according to the required wheeling power and the expected wheeling power, controlling the flexible interconnection device corresponding to the target station area to perform power wheeling. Therefore, the stability and the reliability of the transformer area interconnection system can be improved.

Description

Technical Field

[0001] The present application relates to the field of microgrid control technology, and more specifically, to a substation voltage control method, a substation interconnection system, and an energy storage system. Background Art

[0002] In recent years, the proportion of new energy generation in the power system has continued to increase, and the peak load of electricity has continued to grow. In particular, the promotion and application of large-scale electric vehicles have put forward higher requirements for the safe operation and regulation capabilities of the power system. The change in energy structure will bring about a series of problems such as insufficient power grid capacity, mismatch between power generation and power consumption, and reduced overall stability of the power grid.

[0003] In the prior art, the actual operating power of different transformers is monitored through the area interconnection system, and the power transfer between different transformers is controlled to solve the problems of overload and power management on the distribution network side.

[0004] However, this approach does not take into account the problem of electrical signal backflow and excessive power transfer of the flexible interconnection device, which reduces the stability and reliability of the substation interconnection system. Summary of the invention

[0005] In view of this, the purpose of this application is to provide a substation voltage control method, a substation interconnection system and an energy storage system, which prevents the reverse power and the transfer power of the flexible interconnection device from exceeding the limit by monitoring the real-time operating power of the transformer in each substation and the preset maximum operating power and the preset minimum operating power of the target substation, thereby improving the stability and reliability of the substation interconnection system. At the same time, it also solves the problem of the transfer power of the flexible interconnection device exceeding the limit, thereby achieving the management of the overload problem.

[0006] In order to achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0007] In a first aspect, an embodiment of the present application provides a method for controlling a voltage in a metropolitan area, comprising:

[0008] Determine whether the first real-time operating power of multiple substations exceeds the preset maximum operating power or the preset minimum operating power of the corresponding substation; the first real-time operating power of each substation is the real-time operating power of the transformer in each substation; wherein the preset maximum operating power and the preset minimum operating power are the maximum operating power and the minimum operating power of the transformer in each substation, respectively;

[0009] If the first real-time operating power of the target area exceeds the preset maximum operating power of the target area, the required transfer power of the flexible interconnection device corresponding to the target area is determined according to the preset maximum operating power of the target area, the first real-time operating power of the target area, and the second real-time operating power of the flexible interconnection device corresponding to the target area;

[0010] If the first real-time operating power of the target area exceeds the preset minimum operating power of the target area, the required transfer power of the flexible interconnection device corresponding to the target area is determined according to the preset minimum operating power of the target area, the first real-time operating power of the target area, and the second real-time operating power of the flexible interconnection device corresponding to the target area;

[0011] Determine the expected transfer power of the flexible interconnection device corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area;

[0012] According to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area, the flexible interconnection device corresponding to the target area is controlled to transfer power.

[0013] Optionally, the method further comprises:

[0014] According to the rated power of the flexible interconnection device corresponding to the target area, the demand transfer power of the flexible interconnection device corresponding to the target area is limited so that the demand transfer power after the limiting processing is within a first demand power range, and the first demand power range is: greater than or equal to the negative rated power, and less than or equal to the preset reference power.

[0015] According to the rated power of the flexible interconnection device corresponding to the target substation, the demand transfer power of the flexible interconnection device corresponding to the target substation is limited so that the demand transfer power after the limiting processing is within a second demand power range, and the second demand power range is: a power range greater than or equal to a preset reference power and less than or equal to the positive rated power.

[0016] Optionally, determining the expected transfer power of the flexible interconnection device corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area includes:

[0017] According to the required transfer power of the flexible interconnection device corresponding to the target area and the total number of preset areas, the expected transfer power of the flexible interconnection device corresponding to other areas is calculated.

[0018] Optionally, after determining the expected transfer powers of the flexible interconnection devices corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area, the method further includes:

[0019] According to the preset allowable operating power range of the flexible interconnection device corresponding to the other areas, the expected transfer power of the flexible interconnection device corresponding to the other areas is limited, so that the limited expected transfer power is within the preset operating power range.

[0020] Optionally, the expected transfer power of the flexible interconnection device corresponding to the other area is limited according to the preset allowable operating power range of the flexible interconnection device corresponding to the other area, so that the expected transfer power after the limited processing is within the preset operating power range, and the method further includes:

[0021] Calculate the maximum allowable operating power of the other substations according to the preset maximum operating power of the transformer in the other substations, the first real-time operating power, and the second real-time operating power of the corresponding flexible interconnection device;

[0022] The minimum allowable operating power of the other substations is calculated based on the preset minimum operating power of the transformer in the other substations, the first real-time operating power and the second real-time operating power of the corresponding flexible interconnection device; wherein the preset allowable operating power range is: a power range greater than or equal to the minimum allowable operating power and less than or equal to the maximum allowable operating power.

[0023] Optionally, the method further comprises:

[0024] According to the rated power of the flexible interconnection device corresponding to the other substations, the maximum allowable operating power of the other substations is limited, so that the maximum allowable operating power after the limiting processing is within a third required power range, and the third required power range is: a power range greater than or equal to a preset reference power and less than or equal to the positive rated power;

[0025] According to the rated power of the flexible interconnection device corresponding to the other substations, the minimum allowable operating power of the other substations is limited so that the minimum allowable operating power after the limiting process is within a fourth required power range, and the fourth required power range is: a power range greater than or equal to the negative rated power and less than or equal to a preset reference power.

[0026] Optionally, controlling the target area corresponding flexible interconnection device to transfer power according to the required transfer power and the expected transfer power of the target area corresponding flexible interconnection device includes:

[0027] Calculate the total output power of the flexible interconnection device corresponding to the target area according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area;

[0028] According to the total output power, the flexible interconnection device corresponding to the target area is controlled to transfer power.

[0029] Optionally, before controlling the flexible interconnection device corresponding to the target area to transfer power according to the total output power, the method further includes:

[0030] According to the preset allowable operating power range of the flexible interconnection device corresponding to the target area, the total output power is limited so that the total output power after the limiting process is within the preset allowable operating power range.

[0031] In a second aspect, an embodiment of the present application provides a substation interconnection system, the substation interconnection system comprising: a plurality of flexible interconnection devices and a control device;

[0032] Wherein, the control device is communicatively connected with the multiple flexible interconnection devices; the control device is used to execute the substation voltage control method described in any one of the first aspects.

[0033] In a third aspect, an embodiment of the present application provides an energy storage system, comprising: the substation interconnection system described in the second aspect and a plurality of energy storage units;

[0034] The multiple energy storage units are electrically connected to multiple flexible interconnection devices in the substation interconnection system, and the multiple energy storage units are also electrically connected to the preset DC bus; the multiple energy storage units are communicatively connected to the control equipment in the substation interconnection system.

[0035] Compared with the prior art, this application has the following beneficial effects:

[0036] The embodiment of the present application proposes a substation voltage control method, a substation interconnection system and an energy storage system. The method manages the problem of over-limit transfer power of the substation interconnection system by determining whether the first real-time operating power of multiple substations exceeds the preset maximum operating power or the preset minimum operating power of the corresponding substation; wherein the first real-time operating power of each substation is the real-time operating power of the transformer in each substation; the preset maximum operating power and the preset minimum operating power are the maximum operating power and the minimum operating power of the transformer in each substation respectively; if the first real-time operating power of the target substation exceeds the preset maximum operating power of the target substation, then according to the preset maximum operating power of the target substation, the first real-time operating power of the target substation, and the second real-time operating power of the flexible interconnection device corresponding to the target substation, the required voltage of the flexible interconnection device corresponding to the target substation is determined. The transfer power is sought to solve the problem of overload of the interconnection system of the substation; if the first real-time operating power of the target substation exceeds the preset minimum operating power of the target substation, then the required transfer power of the flexible interconnection device corresponding to the target substation is determined according to the preset minimum operating power of the target substation, the first real-time operating power of the target substation, and the second real-time operating power of the flexible interconnection device corresponding to the target substation, so as to solve the problem of reverse power of the interconnection system of the substation; then, according to the required transfer power of the flexible interconnection device corresponding to the target substation, the expected transfer power of the flexible interconnection device corresponding to other substations is determined; finally, according to the required transfer power and expected transfer power of the flexible interconnection device corresponding to the target substation, the flexible interconnection device corresponding to the target substation is controlled to transfer power. Therefore, the present application can not only meet the overload control and reverse flow control of the substation transformer, but also reduce the problem of over-limit of the transfer power, realize the economic safety and stable operation of the substation, and improve the reliability and stability of the interconnection system of the substation. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 A schematic diagram of a system for interconnecting substations provided in an embodiment of the present application Figure 1 ;

[0039] Figure 2 A schematic diagram of a system for interconnecting substations provided in an embodiment of the present application Figure 2 ;

[0040] Figure 3 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of the structure of a control device provided in an embodiment of the present application;

[0042] Figure 5 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 1 ;

[0043] Figure 6 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 2 ;

[0044] Figure 7 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 3 ;

[0045] Figure 8 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 4 ;

[0046] Fig. 9 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 5 ;

[0047] Fig.10 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 6 ;

[0048] Fig.11 A schematic diagram of the structure of a substation voltage control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0051] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0052] In order to clearly describe a substation voltage control method, a substation interconnection system and an energy storage system provided in an embodiment of the present application, the substation interconnection system is first described in detail with reference to the accompanying drawings.

[0053] Figure 1 A schematic diagram of a system for interconnecting substations provided in an embodiment of the present application Figure 1 .like Figure 1 As shown, the substation interconnection system 100 may include: a plurality of flexible interconnection devices 110 and a control device 120 .

[0054] The control device 120 is connected to the multiple flexible interconnection devices 110 in communication, so as to upload data in the multiple flexible interconnection devices 110 to the control device 120, or the control device 120 controls the multiple flexible interconnection devices 110. For example, the control device 120 monitors the flexible interconnection devices 110 in each area, and adjusts the control mode of the flexible interconnection devices 110 according to the operation mode. The multiple flexible interconnection devices 110 are also electrically connected to a preset DC bus. The preset DC bus can be selected according to actual conditions.

[0055] The control device 120 is used to execute the substation voltage control method. The control device 120 can be selected according to actual conditions, for example, the control device 120 can be selected as an EMS (energy management system). The flexible interconnection device 110 can be selected according to actual conditions, for example, the flexible interconnection device 110 can be selected as an AC / DC (ACDC) converter.

[0056] It should be noted that the control device 120 can also collect the real-time operating power of the transformer in each substation.

[0057] Furthermore, in a possible implementation, the present application also provides a schematic diagram of a dual-zone interconnection system, Figure 2 A schematic diagram of a system for interconnecting substations provided in an embodiment of the present application Figure 2 .like Figure 2 As shown, both substation ① and substation ② are powered by a transformer, and the power supply area can be composed of load, charging area, energy storage area and photovoltaic area; the substation interconnection system 100 connects substation ① and substation ②, and the control device 120 controls the actual operating power of the flexible interconnection device 110 corresponding to each substation by monitoring the actual operating power of the transformer in each substation, thereby achieving the function of overload and reverse current control.

[0058] The substation interconnection system provided in the embodiment of the present application may be composed of a plurality of flexible interconnection devices and a control device, wherein the control device is communicatively connected with the plurality of flexible interconnection devices, and the plurality of flexible interconnection devices are also electrically connected to a preset DC bus; the control device is used to execute the substation voltage control method. Thus, data collection and data processing of the substation interconnection system are realized through the control device, thereby improving the stable and safe operation of the substation interconnection system.

[0059] exist Figure 1 On this basis, the substation interconnection system provided in the above-mentioned embodiment of the present application is explained and illustrated in detail with reference to the accompanying drawings as follows. Figure 3 This is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application. Figure 3 As shown, the energy storage system 200 may further include: a substation interconnection system 100 and a plurality of energy storage units 210 .

[0060] Among them, multiple energy storage units 210 are electrically connected to multiple flexible interconnection devices 110 to charge the energy storage units 210, multiple energy storage units 210 are also electrically connected to a preset DC bus, and multiple energy storage units 210 are also communicatively connected to the control device 120 for data communication and monitoring of the energy storage units 210.

[0061] The energy storage unit 210 may be selected according to actual conditions. For example, the energy storage unit 210 may be a battery.

[0062] The substation interconnection system provided in the embodiment of the present application can also be composed of multiple energy storage units, wherein the multiple energy storage units are electrically connected to multiple flexible interconnection devices, and the multiple energy storage units are also electrically connected to a preset DC bus; and the multiple energy storage units are communicatively connected to a control device. Thus, the stable and safe operation of the substation interconnection system is improved.

[0063] In order to clearly describe the substation interconnection system 100 provided in the above embodiment, the present application also provides a structural schematic diagram of a control device 120. Figure 4 This is a schematic diagram of the structure of a control device provided in an embodiment of the present application. Figure 4 As shown, the control device 120 may include: a processor 121 and a memory 122 .

[0064] The memory 122 stores machine executable instructions that can be executed by the processor 121, that is, when the control device 120 is running, the above machine readable instructions are executed, and the processor 121 communicates with the memory 122 via a bus. The processor 121 can execute the machine executable instructions to implement the station voltage control method.

[0065] Among them, the memory 122, the processor 121 and the bus components are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines. The mobile storage device includes at least one software function module that can be stored in the memory 122 in the form of software or firmware or solidified in the operating system (OS) of the electronic device. The processor 121 is used to execute the executable modules stored in the memory 122, such as the software function modules and computer programs included in the station area voltage control method of the mobile storage medium.

[0066] Among them, the memory 122 can be, but is not limited to, random access memory (Random Access Memory, RAM), read-only memory (Read Only Memory, ROM), programmable read-only memory (Programmable Read-Only Memory, PROM), erasable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable read-only memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc.

[0067] The substation voltage control method provided in the embodiment of the present application may be executed by the processor 121 in the control device 120. The substation voltage control method provided in the above embodiment of the present application is explained and illustrated in detail below in conjunction with the accompanying drawings. Figure 5 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 1 .like Figure 5 As shown, applied to a controller used in a charging device, the method may include:

[0068] S301: Determine whether the first real-time operating power of a plurality of stations exceeds a preset maximum operating power or a preset minimum operating power of the corresponding stations.

[0069] The first real-time operating power P_pccX_run of each transformer area is the real-time operating power of the transformer in each transformer area.

[0070] Among them, the preset maximum operating power P_pccX_set_max and the preset minimum operating power P_pccX_set_min are the maximum operating power and the minimum operating power of the transformer in each substation respectively. The preset maximum operating power P_pccX_set_max and the preset minimum operating power P_pccX_set_min can be selected according to actual conditions. For example, the preset maximum operating power P_pccX_set_max can be selected as 800KW, and the preset minimum operating power P_pccX_set_min can be selected as 50KW.

[0071] In one possible implementation, when determining whether the first real-time operating power P_pccX_run of multiple substations exceeds the preset maximum operating power P_pccX_set_max of the corresponding substation, if the first real-time operating power P_pccX_run of the target substation exceeds the preset maximum operating power P_pccX_set_max of the target substation (such as 800KW), execute step S302; if the first real-time operating power P_pccX_run of the target substation exceeds the preset minimum operating power P_pccX_set_min of the target substation (such as 50KW), execute step S303.

[0072] S302: If the first real-time operating power of the target area exceeds the preset maximum operating power of the target area, the required transfer power of the flexible interconnection device corresponding to the target area is determined according to the preset maximum operating power of the target area, the first real-time operating power of the target area, and the second real-time operating power of the flexible interconnection device corresponding to the target area.

[0073] In one possible implementation, if the first real-time operating power P_pccX_run of the target area exceeds the preset maximum operating power P_pccX_set_max (e.g., 800KW) of the target area, that is, the first real-time operating power P_pccX_run of the target area is greater than the preset maximum operating power P_pccX_set_max (e.g., 800KW) of the target area, an overload problem is likely to occur. Therefore, the demand transfer power P_fidX_need1 of the flexible interconnection device corresponding to the target area can be determined according to the preset maximum operating power P_pccX_set_max (e.g., 800KW) of the target area, the first real-time operating power P_pcc1_run of the target area, and the second real-time operating power P_fidX_run of the flexible interconnection device corresponding to the target area, using the following formula (1).

[0074] P_fidX_need1=P_pccX_set_max-P_pccX_run+P_fidX_run formula (1)

[0075] S303: If the first real-time operating power of the target area exceeds the preset minimum operating power of the target area, the required transfer power of the flexible interconnection device corresponding to the target area is determined according to the preset minimum operating power of the target area, the first real-time operating power of the target area, and the second real-time operating power of the flexible interconnection device corresponding to the target area.

[0076] In one possible implementation, if the first real-time operating power P_pccX_run of the target area exceeds the preset minimum operating power P_pccX_set_min (e.g., 50KW) of the target area, that is, the first real-time operating power P_pccX_run of the target area is less than the preset minimum operating power P_pccX_set_min (e.g., 50KW) of the target area, power backflow is likely to occur. Therefore, the demand transfer power P_fidX_need2 of the flexible interconnection device corresponding to the target area can be determined according to the preset minimum operating power P_pccX_set_min of the target area, the first real-time operating power P_pccX_run of the target area, and the second real-time operating power P_fidX_run of the flexible interconnection device corresponding to the target area using the following formula (2).

[0077] P_fidX_need2=P_pccX_set_min-P_pccX_run+P_fidX_run formula (2)

[0078] S304: Determine the expected transfer powers of the flexible interconnection devices corresponding to other substations according to the required transfer powers of the flexible interconnection devices corresponding to the target substation.

[0079] In a possible implementation, since the required transfer power P_fidX_needX is the power transferred from other substations, the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to the other substations can be determined according to the required transfer power P_fidX_needX of the flexible interconnection device corresponding to the target substation.

[0080] For example, if the required transfer power P_fidX_needX of the flexible interconnection device corresponding to the target area is -100KW, other areas are required to transfer 100KW, wherein the 100KW is the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to other areas.

[0081] It should be noted that the required transfer power P_fidX_needX of the flexible interconnection device corresponding to the target area is the sum of the required transfer power calculated according to the preset minimum operating power of the target area and the preset maximum operating power of the target area, that is, P_fidX_needX is P_fidX_need1+P_fidX_need2. The required transfer power P_fidX_needX can be understood as the total required transfer power corresponding to the target area.

[0082] S305 , controlling the flexible interconnection device corresponding to the target area to transfer power according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area.

[0083] In one possible implementation method, according to the demand transfer power P_fidX_needX and the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to the target substation, the flexible interconnection device corresponding to the target substation is controlled to transfer power, so that the power between the target substation and other substations can be consumed locally, thereby improving the power supply quality of the substation interconnection system and the reliability of system operation.

[0084] The embodiment of the present application proposes a substation voltage control method, which manages the power transfer over-limit problem of the substation interconnection system by determining whether the first real-time operating power of multiple substations exceeds the preset maximum operating power or the preset minimum operating power of the corresponding substation; wherein the first real-time operating power of each substation is the real-time operating power of the transformer in each substation; the preset maximum operating power and the preset minimum operating power are the maximum operating power and the minimum operating power of the transformer in each substation, respectively; if the first real-time operating power of the target substation exceeds the preset maximum operating power of the target substation, then according to the preset maximum operating power of the target substation, the first real-time operating power of the target substation, and the second real-time operating power of the flexible interconnection device corresponding to the target substation, the target substation is determined. The demand transfer power of the flexible interconnection device is used to solve the problem of overload of the interconnection system in the substation; if the first real-time operating power of the target substation exceeds the preset minimum operating power of the target substation, the demand transfer power of the flexible interconnection device corresponding to the target substation is determined according to the preset minimum operating power of the target substation, the first real-time operating power of the target substation, and the second real-time operating power of the flexible interconnection device corresponding to the target substation, so as to solve the problem of reverse power of the interconnection system in the substation; then, according to the demand transfer power of the flexible interconnection device corresponding to the target substation, the expected transfer power of the flexible interconnection device corresponding to other substations is determined; finally, according to the demand transfer power and expected transfer power of the flexible interconnection device corresponding to the target substation, the flexible interconnection device corresponding to the target substation is controlled to transfer power. Therefore, the present application can not only meet the overload control and reverse flow control of the substation transformer, but also reduce the problem of over-limit of the transfer power, realize the economic safety and stable operation of the substation, and improve the reliability and stability of the interconnection system in the substation.

[0085] The following is a detailed explanation and description of the substation voltage control method provided in the above embodiment of the present application in conjunction with the accompanying drawings. Figure 6 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 2 .like Figure 6 As shown, the above method may also include:

[0086] S401: According to the rated power of the flexible interconnection device corresponding to the target area, limit the demand transfer power of the flexible interconnection device corresponding to the target area, so that the demand transfer power after the limit processing is within a first demand power range.

[0087] The first required power P_fidX_need1 ranges from: greater than or equal to the negative rated power P_fidX_rate, and less than or equal to the preset reference power. The preset reference power can be selected according to actual conditions, for example, the preset reference power can be selected as 0KW. The rated power P_fidX_rate of the flexible interconnection device can also be selected according to actual conditions, for example, the rated power P_fidX_rate of the flexible interconnection device can be selected as 200KW.

[0088] In one possible implementation, the demand transfer power P_fidX_needX of the flexible interconnection device corresponding to the target area is limited according to the rated power P_fidX_rate (such as 200KW) of the flexible interconnection device corresponding to the target area, so that the demand transfer power P_fidX_needX after the limiting processing is within the first demand power range P_fidX_need1. That is, if the first real-time operating power P_pccX_run of the target area is greater than the preset maximum operating power P_pccX_set_max (such as 800KW) of the target area, an overload problem is likely to occur. Therefore, the demand transfer power P_fidX_need1 of the flexible interconnection device corresponding to the target area can be determined according to the preset maximum operating power P_pccX_set_max (such as 800KW) of the target area, the first real-time operating power P_pccX_run of the target area, and the second real-time operating power P_fidX_run of the flexible interconnection device corresponding to the target area using the above formula (1), P_fidX_need1∈[-P_fidX_rate, 0).

[0089] S402: According to the rated power of the flexible interconnection device corresponding to the target area, limit the required transfer power of the flexible interconnection device corresponding to the target area, so that the required transfer power after the limit processing is within a second required power range.

[0090] The second required power P_fidX_need2 has a power range that is greater than or equal to a preset reference power (such as 0 KW) and less than or equal to a positive rated power P_fidX_rate (such as 200 KW).

[0091] In one possible implementation, the demand transfer power P_fidX_needX of the flexible interconnection device corresponding to the target area is limited according to the rated power P_fidX_rate (such as 200KW) of the flexible interconnection device corresponding to the target area, so that the demand transfer power P_fidX_needX after the limiting processing is within the second demand power range P_fidX_need2. That is, if the first real-time operating power P_pccX_run of the target area is less than the preset minimum operating power P_pccX_set_min (e.g., 50KW) of the target area, a backflow problem is likely to occur. Therefore, the required transfer power P_fidX_need2 of the flexible interconnection device corresponding to the target area can be determined based on the preset minimum operating power P_pccX_set_min of the target area, the first real-time operating power P_pccX_run of the target area, and the second real-time operating power P_fidX_run of the flexible interconnection device corresponding to the target area using the above formula (2), P_fidX_need2∈[0,+P_fidX_rate].

[0092] The voltage control method of the substation proposed in the embodiment of the present application can limit the demand transfer power of the flexible interconnection device corresponding to the target substation according to the rated power of the flexible interconnection device corresponding to the target substation and the preset maximum operating power of the target substation, so that the demand transfer power after the limit processing is within the first demand power range to avoid the problem of overload. The first demand power range is: greater than or equal to the negative rated power, and less than or equal to the preset reference power power. The power range; according to the rated power of the flexible interconnection device corresponding to the target substation and the preset minimum operating power of the target substation, the demand transfer power of the flexible interconnection device corresponding to the target substation is limited so that the demand transfer power after the limit processing is within the second demand power range to avoid the problem of power reverse flow. The second demand power range is: greater than or equal to the preset reference power, and less than or equal to the positive rated power. Therefore, the present application can achieve the control of overload and power reverse flow problems by limiting the demand transfer power of the flexible interconnection device corresponding to the target substation.

[0093] Optionally, in a possible implementation embodiment, the method may include determining the expected transfer power of the flexible interconnection device corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area, which may include:

[0094] According to the required transfer power P_fidX_need of the flexible interconnection device corresponding to the target area and the total number of preset areas XM, the expected transfer power of the flexible interconnection devices corresponding to other areas is calculated.

[0095] The total number of preset stations XM can be selected according to actual conditions. For example, the total number of preset stations XM can be selected as 2.

[0096] In a possible implementation, based on the required transfer power P_fidX_need of the flexible interconnection device corresponding to the target area and the preset total number of areas XM, the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to other areas is calculated using the following formula (3).

[0097] P_fidX_exchange=(-P_fidX_need) / (XM-1) Formula (3)

[0098] Wherein, X is any value within the preset number of stations XM, X=1, 2, ..., XM.

[0099] For example, if the total number of preset areas XM is 2, the required transfer power P_fidX_need of the flexible interconnection device corresponding to the target area is -100KW, and other areas are required to transfer 100KW, where the 100KW is the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to other areas.

[0100] The method for controlling the voltage of the substation proposed in the embodiment of the present application can calculate the expected transfer power of the flexible interconnection device corresponding to other substations using the above formula (3) according to the required transfer power of the flexible interconnection device corresponding to the target substation and the total number of preset substations. Thus, the stability and reliability of the substation interconnection system are improved.

[0101] Optionally, in a possible implementation embodiment, after determining the expected transfer power of the flexible interconnection device corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area in the above method, the method may further include:

[0102] According to the preset allowable operating power range of the flexible interconnection device corresponding to other areas, the expected transfer power of the flexible interconnection device corresponding to other areas is limited so that the limited expected transfer power is within the preset operating power range.

[0103] Among them, the preset allowable operating power range of the flexible interconnection device corresponding to other substations can be selected according to actual conditions.

[0104] In one possible implementation, based on the preset allowable operating power range of the flexible interconnection device corresponding to other areas, the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to other areas is limited, so that the expected transfer power after the limited processing is within the preset operating power range. That is, the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to other areas is within the preset operating power range.

[0105] The voltage control method for the substation area proposed in the embodiment of the present application can limit the expected transfer power of the flexible interconnection device corresponding to other substation areas according to the preset allowable operating power range of the flexible interconnection device corresponding to other substation areas, so that the expected transfer power processed by the limiting process is within the preset operating power range. Thus, the stability and reliability of the substation area interconnection system are improved.

[0106] The following is a detailed explanation and description of the substation voltage control method provided in the above embodiment of the present application in conjunction with the accompanying drawings. Figure 7 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 3 .like Figure 7 As shown, in the above method, according to the preset allowable operating power range of the flexible interconnection device corresponding to other areas, the expected transfer power of the flexible interconnection device corresponding to other areas is limited, so that the expected transfer power processed by the limited operation is within the preset operating power range. The method may also include:

[0107] S501. Calculate the maximum allowable operating power of other substations according to the preset maximum operating power of the transformers in other substations, the first real-time operating power, and the second real-time operating power of the corresponding flexible interconnection device.

[0108] In one possible implementation, if the first real-time operating power P_pccX_run of the target substation is less than or equal to the preset maximum operating power P_pccX_set_max (e.g., 800KW) of the target substation, the maximum allowable operating power P_fidX_allow1 of other substations can be calculated using the following (4) based on the preset maximum operating power P_pccX_set_max (e.g., 800KW) of the transformers in other substations, the first real-time operating power P_pccX_run, and the second real-time operating power P_fidX_run of the corresponding flexible interconnection device.

[0109] P_fidX_allow1=P_pccX_set_maX-P_pccX_run+P_fidX_run formula (4)

[0110] S502: Calculate the minimum allowable operating power of other substations according to the preset minimum operating power of the transformers in other substations, the first real-time operating power, and the second real-time operating power of the corresponding flexible interconnection device.

[0111] The preset allowable operating power range is: a power range greater than or equal to the minimum allowable operating power P_fidX_allow2, and less than or equal to the maximum allowable operating power P_fidX_allow1. That is, the preset allowable operating power range is [P_fidX_allow2, P_fidX_allow1].

[0112] In one possible implementation, if the first real-time operating power P_pccX_run of the target substation is greater than or equal to the preset maximum operating power P_pccX_set_min (e.g., 50KW) of the target substation, the minimum allowable operating power P_fidX_allow2 of other substations can be calculated using the following (5) based on the preset minimum operating power P_pccX_set_min (e.g., 50KW) of the transformers in other substations, the first real-time operating power P_pccX_run, and the second real-time operating power P_fidX_run of the corresponding flexible interconnection device.

[0113] P_fidX_allow2=P_pccX_set_min-P_pccX_run+P_fidX_run formula (5)

[0114] The substation voltage control method proposed in the embodiment of the present application can calculate the maximum allowable operating power according to the preset maximum operating power of the transformer in other substations, that is, according to the preset maximum operating power, the first real-time operating power and the second real-time operating power of the corresponding flexible interconnection device, calculate the maximum allowable operating power of other substations; calculate the minimum allowable operating power according to the preset minimum operating power of the transformer in other substations, that is, according to the preset minimum operating power, the first real-time operating power and the second real-time operating power of the corresponding flexible interconnection device, calculate the minimum allowable operating power of other substations; wherein the preset allowable operating power range is: greater than or equal to the minimum allowable operating power, and less than or equal to the maximum allowable operating power. Therefore, the present application can obtain the range value of the operating transfer power of the transformer in other substations, and then improve the stability and reliability of the substation interconnection system when the substation interconnection system performs power transfer.

[0115] The following is a detailed explanation and description of the substation voltage control method provided in the above embodiment of the present application in conjunction with the accompanying drawings. Figure 8 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 4 .like Figure 8 As shown, the above method may also include:

[0116] S601: According to the rated power of the flexible interconnection device corresponding to the other substations, the maximum allowable operating power of the other substations is limited so that the maximum allowable operating power after the limiting process is within the third required power range.

[0117] The third required power range is: a power range greater than or equal to a preset reference power (such as 0KW), and less than or equal to a positive rated power P_fidX_rate. That is, the third required power range is [0, +P_fidX_rate].

[0118] In a possible implementation, according to the rated power P_fidX_rate of the flexible interconnection device corresponding to the other substations, the maximum allowable operating power P_fidX_allow1 of the other substations is limited, so that the maximum allowable operating power P_fidX_allow1 after the limiting processing is within the third required power range, that is, the maximum allowable operating power P_fidX_allow1∈[0,+P_fidX_rate].

[0119] S602: According to the rated powers of the flexible interconnection devices corresponding to the other substations, the minimum allowable operating powers of the other substations are limited so that the minimum allowable operating powers after the limiting process are within a fourth required power range.

[0120] The fourth required power range is: a power range greater than or equal to the negative rated power P_fidX_rate, and less than or equal to a preset reference power (such as 0KW), that is, the fourth required power range is [-P_fidX_rate, 0].

[0121] In a possible implementation, according to the rated power P_fidX_rate of the flexible interconnection device corresponding to the other stations, the minimum allowable operating power P_fidX_allow2 of the other stations is limited, so that the minimum allowable operating power P_fidX_allow2 after the limiting processing is within the fourth required power range, that is, the minimum allowable operating power P_fidX_allow2∈[-P_fidX_rate, 0].

[0122] The voltage control method for the substation proposed in the embodiment of the present application is, according to the preset maximum operating power, through the rated power of the corresponding flexible interconnection device of other substations, to limit the maximum allowable operating power of other substations, so that the maximum allowable operating power after the limiting process is within the third required power range, and the third required power range is: greater than or equal to the preset reference power, and less than or equal to the positive rated power power range; according to the preset minimum operating power, through the rated power of the corresponding flexible interconnection device of other substations, to limit the minimum allowable operating power of other substations, so that the minimum allowable operating power after the limiting process is within the fourth required power range, and the fourth required power range is: greater than or equal to the negative rated power, and less than or equal to the preset reference power power range. Therefore, the present application can obtain the range value of the operating transfer power of the transformer in other substations, and then improve the stability and reliability of the substation interconnection system when the substation interconnection system performs power transfer.

[0123] The following is a detailed explanation and description of the substation voltage control method provided in the above embodiment of the present application in conjunction with the accompanying drawings. Fig. 9 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 5 .like Fig. 9 As shown, in the above method, according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area, controlling the target area to transfer power to the corresponding flexible interconnection device may include:

[0124] S701. Calculate the total output power of the flexible interconnection device corresponding to the target area according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area.

[0125] In a possible implementation, according to the required transfer power P_fidX_need and the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to the target area, the following (6) is used to calculate the total output power P_fidX_total of the flexible interconnection device corresponding to the target area.

[0126] P_fidX_total=(P_fidX_need)*A / (A+B)+(P_fidX_excharge)*B / (A+B)

[0127] Formula (6)

[0128] Among them, A = abs(P_fidX_need); B = abs(P_fidX_exchange); that is, in the above formula (6), A and B are the absolute values ​​of the required transfer power P_fidX_need and the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to the target area, respectively.

[0129] The above formula (6) indicates that the total output power P_fidX_total of the flexible interconnection device corresponding to the target area is the product of the proportion of the required transfer power P_fidX_need and the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to the target area.

[0130] S702: According to the total output power, control the flexible interconnection device corresponding to the target area to transfer power.

[0131] In one possible implementation, according to the total output power P_fidX_total, the flexible interconnection device corresponding to the target substation is controlled to transfer power so that the power between the target substation and other substations can be consumed locally, thereby improving the power supply quality and system operation reliability of the substation interconnection system.

[0132] The voltage control method of the substation proposed in the embodiment of the present application calculates the total output power of the flexible interconnection device corresponding to the target substation according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target substation, and the respective ratios calculated according to the absolute values ​​of the required transfer power and the expected transfer power; and controls the flexible interconnection device corresponding to the target substation to transfer power according to the total output power. Therefore, the present application can make the power between the target substation and other substations be consumed on the spot, thereby improving the power supply quality of the substation interconnection system and the reliability of system operation.

[0133] Optionally, in a possible implementation embodiment, before controlling the target area corresponding to the flexible interconnection device to transfer power according to the total output power in the above method, the method may further include:

[0134] According to the preset allowable operating power range of the flexible interconnection device corresponding to the target area, the total output power is limited so that the total output power after the limiting process is within the preset allowable operating power range.

[0135] In one possible implementation method, the total output power P_fidX_total is limited according to the preset allowable operating power range [P_fidX_allow2, P_fidX_allow1] of the flexible interconnection device corresponding to the target substation, so that the total output power P_fidX_total after the limiting process is within the preset allowable operating power range, that is, after the total output power P_fidX_total is obtained, the total output power P_fidX_total is compared with the allowable transfer power of the target substation to obtain the final transfer power of the target substation, thereby allowing the power between the target substation and other substations to be consumed locally, thereby improving the power supply quality of the substation interconnection system and the reliability of the system operation.

[0136] The substation voltage control method proposed in the embodiment of the present application limits the total output power according to the preset allowable operating power range of the flexible interconnection device corresponding to the target substation, so that the total output power after the limiting process is within the preset allowable operating power range, thereby absorbing the power between the target substation and other substations on-site, thereby improving the power supply quality of the substation interconnection system and the reliability of the system operation.

[0137] To facilitate understanding of the above-mentioned substation voltage control method, the present application embodiment further provides an example of a process of the substation voltage control method, which is described below in conjunction with the accompanying drawings. Fig.10 A schematic diagram of a method for controlling a voltage in a station area provided in an embodiment of the present application Figure 6 .like Fig.10 As shown, the station area voltage control method may include:

[0138] S801. Obtain a preset maximum operating power, a preset minimum operating power, and a corresponding rated power of a flexible interconnection device of a transformer in a target area.

[0139] Specifically, the data of the interconnection system of the substations is initialized, according to the preset maximum operating power P_pccX_set_max (such as 800KW) of the transformer or line connection point PCC, the preset minimum allowable power P_pccX_set_min (such as 50KW) of the transformer or line connection point PCC is set, and the rated power P_fidX_rate (such as 200KW) of the flexible substation device fidX is set. Wherein, X is any value within the preset number of substations XM, X=1, 2, ..., XM.

[0140] S802: Calculate the required transfer power corresponding to the first real-time operating power of the target area according to the preset minimum operating power and the preset maximum operating power of the target area, and calculate the total required transfer power of the target area.

[0141] Specifically, according to the preset maximum operating power P_pccX_set_max (such as 800KW) of the target area, the above formula (1) is used to calculate the first required transfer power P_fidX_need1 of the flexible interconnection device corresponding to the target area. The first required transfer power P_fidX_need1 is the required transfer power calculated when the first real-time operating power P_pccX_run of the target area is greater than the preset maximum operating power P_pccX_set_max (such as 800KW) of the target area. In order to avoid the problem of overloading, it is limited by a power range greater than or equal to the negative rated power P_fidX_rate and less than or equal to the preset reference power (such as 0KW), that is, P_fidX_need1∈[-P_fidX_rate, 0].

[0142] According to the preset minimum operating power P_pccX_set_min (such as 50KW) of the target area, the above formula (2) is used to calculate the second required transfer power P_fidX_need2 of the flexible interconnection device corresponding to the target area. The second required transfer power P_fidX_need2 is the required transfer power calculated when the first real-time operating power P_pccX_run of the target area is less than the preset maximum operating power P_pccX_set_min (such as 50KW) of the target area. In order to avoid the problem of power reverse flow, it is limited by a power range greater than or equal to a preset reference power (such as 0KW) and less than or equal to a positive rated power P_fidX_rate (such as 200KW), that is, P_fidX_need2∈[0,+P_fidX_rate]. According to the first required transfer power P_fidX_need1 of the target area corresponding to the flexible interconnection device and the second required transfer power P_fidX_need2 of the target area corresponding to the flexible interconnection device, the total required transfer power P_fidX_need of the target area corresponding to the flexible interconnection device is calculated, that is, P_fidX_needX is P_fidX_need1+P_fidX_need2.

[0143] S803: Calculate the minimum allowable operating power and the maximum allowable operating power corresponding to the first real-time operating power of the target area according to the preset minimum operating power and the preset maximum operating power of the target area.

[0144] Specifically, if the first real-time operating power P_pccX_run of the target substation is less than or equal to the preset maximum operating power P_pccX_set_max (e.g., 800KW) of the target substation, the maximum allowable operating power P_fidX_allow1 of the other substation can be calculated according to the preset maximum operating power P_pccX_set_max (e.g., 800KW) of the transformer in the other substation, the first real-time operating power P_pccX_run and the second real-time operating power P_fidX_run of the corresponding flexible interconnection device using the above (4), and the maximum allowable operating power P_fidX_allow1 of the other substation is [0, +P_fidX_rate].

[0145] If the first real-time operating power P_pccX_run of the target substation is greater than or equal to the preset maximum operating power P_pccX_set_min (e.g., 50KW) of the target substation, the minimum allowable operating power P_fidX_allow2 of other substations can be calculated according to the preset minimum operating power P_pccX_set_min (e.g., 50KW) of the transformers in other substations, the first real-time operating power P_pccX_run and the second real-time operating power P_fidX_run of the corresponding flexible interconnection device using the above (5), and the minimum allowable operating power P_fidX_allow2 of other substations is P_fidX_allow2∈[-P_fidX_rate, 0].

[0146] S804: Determine the expected transfer powers of the flexible interconnection devices corresponding to other substations according to the total required transfer powers of the flexible interconnection devices corresponding to the target substation and the total number of preset substations.

[0147] Specifically, since the required transfer power P_fidX_needX is the power transferred from other substations, the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to the target substation can be calculated according to the required transfer power P_fidX_needX of the flexible interconnection device corresponding to the target substation and the total number of preset substations XM, using the above formula (3), the expected transfer power P_fidX_exchange of the flexible interconnection device ∈ [P_fidX_allow2, P_fidX_allow1].

[0148] S805 , controlling the flexible interconnection device corresponding to the target area to transfer power according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area.

[0149] Specifically, according to the required transfer power P_fidX_need and the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to the target area, the above (6) is used to calculate the total output power P_fidX_total of the flexible interconnection device corresponding to the target area, and the total output power P_fidX_total of the flexible interconnection device ∈ [P_fidX_allow2, P_fidX_allow1].

[0150] For example, taking the total number of preset areas XM as 3 as an example, examples are given for the cases where only one area is overloaded and two areas are overloaded.

[0151] Table 1 is a schematic diagram of a case where only one station area is overloaded, as provided in an embodiment of the present application.

[0152]

[0153]

[0154] It can be seen from Table 1 that when the load of area ① suddenly increases, that is, the first real-time operating power P_pccX_run of area ① is 900KW, it exceeds the preset maximum operating power P_pccX_set_max (800KW) of area ①. Then, according to the above formula (1), the required transfer power P_fidX_need1 of the flexible interconnection device of area ① is -100KW, that is, the total required transfer power P_fidX_need of the flexible interconnection device of area ① is -100KW; then, according to the above formula (4) and the above formula (5), the area ① is obtained respectively. The maximum allowable operating power P_fidX_allow1 = -100KW and the minimum allowable operating power P_fidX_allow2 = -850KW; then the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to other substations is calculated according to the above formula (3), that is, the expected transfer power P_fidX_exchange of substations ② and ③ is 50KW; finally, the total output power P_fidX_total of the flexible interconnection device corresponding to substation ① is calculated according to the above formula (6) as -100KW. Then, according to the total output power P_fidX_total of the flexible interconnection device corresponding to substation ① as -100KW, power transfer control is performed on substations ② and ③, so that the first real-time allowable power of substation ① is 800KW, and the first real-time allowable power of substations ② and ③ is 550KW respectively, realizing the local power consumption between substation ① and other substations, thereby improving the power supply quality and system operation reliability of the substation interconnection system.

[0155] Table 2 is a schematic diagram of two-station overload provided in an embodiment of the present application.

[0156]

[0157]

[0158] It can be seen from Table 1 above that when the load of area ① and area ② is suddenly increased, that is, the first real-time operating power P_pccX_run of area ① is 900KW, and the first real-time operating power P_pccX_run of area ② is 900KW, it exceeds the preset maximum operating power P_pccX_set_max (800KW) of area ① and area ②. Then, according to the above formula (1), the required transfer power P_fidX_need1 of the flexible interconnection device of area ① and area ② is -100KW, that is, the total required transfer power P_fidX_need of the flexible interconnection device of area ① and area ② is -1 00KW; then according to the above formula (4) and the above formula (5), the maximum allowable operating power P_fidX_allow1 of area ① and area ② are both -100KW and the minimum allowable operating power P_fidX_allow2 are both -850KW; then according to the above formula (3), the expected transfer power P_fidX_exchange of the flexible interconnection device corresponding to area ① and area ② is calculated to be 50KW; finally, according to the above formula (6), the total output power P_fidX_total of the flexible interconnection device corresponding to area ① and area ② is calculated to be -100KW. Then, according to the total output power P_fidX_total of the flexible interconnection devices corresponding to substations ① and ② being -100KW, power control is performed on substation ③ so that the first real-time allowable power of substations ① and ② is 800KW, and the first real-time allowable power of substation ③ is 700KW, respectively. The power consumption between substations ①, ② and ③ is realized on-site, thereby improving the power supply quality of the substation interconnection system and the reliability of system operation.

[0159] The embodiment of the present application provides a method for controlling the voltage of a substation, obtaining the preset maximum operating power, the preset minimum operating power and the rated power of the corresponding flexible interconnection device of the transformer in the target substation; calculating the required transfer power corresponding to the first real-time operating power of the target substation according to the preset minimum operating power and the preset maximum operating power of the target substation, and calculating the total required transfer power of the target substation; calculating the minimum allowable operating power and the maximum allowable operating power corresponding to the first real-time operating power of the target substation according to the preset minimum operating power and the preset maximum operating power of the target substation; determining the expected transfer power of the flexible interconnection device corresponding to other substations according to the total required transfer power of the flexible interconnection device corresponding to the target substation and the total number of preset substations; controlling the flexible interconnection device corresponding to the target substation to transfer power according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target substation. Therefore, the present application can not only meet the overload control and reverse flow control of the substation transformer, but also reduce the problem of over-limit transfer power, realize the economic safety and stable operation of the substation, and improve the reliability and stability of the substation interconnection system.

[0160] Based on the same inventive concept, a substation voltage control device is also provided in the embodiment of the present application. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the above-mentioned substation voltage control method in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0161] Fig.11 This is a schematic diagram of the structure of a station area voltage control device provided in an embodiment of the present application. Fig.11 As shown, the station area voltage control device 90 may include:

[0162] The first determination module 91 is used to determine whether the first real-time operating power of multiple substations exceeds the preset maximum operating power or the preset minimum operating power of the corresponding substation; the first real-time operating power of each substation is the real-time operating power of the transformer in each substation; wherein the preset maximum operating power and the preset minimum operating power are the maximum operating power and the minimum operating power of the transformer in each substation, respectively;

[0163] The second determining module 92 is configured to determine the required transfer power of the flexible interconnection device corresponding to the target area according to the preset maximum operating power of the target area, the first real-time operating power of the target area, and the second real-time operating power of the flexible interconnection device corresponding to the target area if the first real-time operating power of the target area exceeds the preset maximum operating power of the target area;

[0164] The third determination module 93 is used to determine the required transfer power of the flexible interconnection device corresponding to the target area according to the preset minimum operating power of the target area, the first real-time operating power of the target area, and the second real-time operating power of the flexible interconnection device corresponding to the target area if the first real-time operating power of the target area exceeds the preset minimum operating power of the target area;

[0165] A fourth determination module 94 is used to determine the expected transfer power of the flexible interconnection device corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area;

[0166] The control module 95 is used to control the target area corresponding flexible interconnection device to transfer power according to the required transfer power and the expected transfer power of the target area corresponding flexible interconnection device.

[0167] In an optional embodiment, the substation voltage control device 90 is also used to: according to the rated power of the flexible interconnection device corresponding to the target substation, limit the demand transfer power of the flexible interconnection device corresponding to the target substation, so that the demand transfer power after the limiting processing is within a first demand power range, and the first demand power range is: a power range greater than or equal to the negative rated power, and less than or equal to a preset reference power; according to the rated power of the flexible interconnection device corresponding to the target substation, limit the demand transfer power of the flexible interconnection device corresponding to the target substation, so that the demand transfer power after the limiting processing is within a second demand power range, and the second demand power range is: a power range greater than or equal to the preset reference power, and less than or equal to the positive rated power.

[0168] In an optional implementation, the fourth determination module 94 is specifically configured to calculate the expected transfer power of the flexible interconnection device corresponding to other substations according to the required transfer power of the flexible interconnection device corresponding to the target substation and the total number of preset substations.

[0169] In an optional embodiment, the fourth determination module 94 is also used to: limit the expected transfer power of the flexible interconnection devices corresponding to other substations according to the preset allowable operating power range of the flexible interconnection devices corresponding to other substations, so that the expected transfer power after the limiting processing is within the preset operating power range.

[0170] In an optional embodiment, the fourth determination module 94 is also used to: calculate the maximum allowable operating power of other substations based on the preset maximum operating power of the transformers in other substations, the first real-time operating power and the second real-time operating power of the corresponding flexible interconnection device; calculate the minimum allowable operating power of other substations based on the preset minimum operating power of the transformers in other substations, the first real-time operating power and the second real-time operating power of the corresponding flexible interconnection device; wherein the preset allowable operating power range is: a power range greater than or equal to the minimum allowable operating power, and less than or equal to the maximum allowable operating power.

[0171] In an optional embodiment, the fourth determination module 94 is also used to: limit the maximum allowable operating power of other substations according to the rated power of the flexible interconnection device corresponding to other substations, so that the maximum allowable operating power after the limiting process is within a third required power range, and the third required power range is: a power range greater than or equal to a preset reference power, and less than or equal to the positive rated power; limit the minimum allowable operating power of other substations according to the rated power of the flexible interconnection device corresponding to other substations, so that the minimum allowable operating power after the limiting process is within a fourth required power range, and the fourth required power range is: a power range greater than or equal to the negative rated power, and less than or equal to the preset reference power.

[0172] In an optional implementation, the control module 95 is specifically used to: calculate the total output power of the flexible interconnection device corresponding to the target area according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area; and control the flexible interconnection device corresponding to the target area to transfer power according to the total output power.

[0173] In an optional embodiment, the control module 95 is also used to: limit the total output power according to the preset allowable operating power range of the flexible interconnection device corresponding to the target area, so that the total output power after limiting is within the preset allowable operating power range.

[0174] It should be noted that for details not disclosed in the substation voltage control device of the embodiment of the present application, please refer to the details disclosed in the substation voltage control method of the embodiment of the present application, and the details will not be repeated here.

[0175] The above modules may be one or more integrated circuits configured to implement the above methods, such as one or more application specific integrated circuits (ASICs), or one or more microprocessors, or one or more field programmable gate arrays (FPGAs). For another example, when a module is implemented in the form of a processing element scheduling program code, the processing element may be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call program code. For another example, these modules may be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0176] Optionally, the embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the processor executes the steps of the station area voltage control method of the mobile storage medium in the above embodiment. The specific implementation method and technical effect are similar and will not be repeated here.

[0177] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0178] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0179] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0180] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (English: processor) to perform some steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (English: Read-Only Memory, abbreviated: ROM), random access memory (English: Random Access Memory, abbreviated: RAM), disk or optical disk and other media that can store program codes.

[0181] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for controlling a voltage in a station area, characterized in that: include: Determine whether the first real-time operating power of multiple substations exceeds the preset maximum operating power or the preset minimum operating power of the corresponding substation; the first real-time operating power of each substation is the real-time operating power of the transformer in each substation; wherein the preset maximum operating power and the preset minimum operating power are the maximum operating power and the minimum operating power of the transformer in each substation, respectively; If the first real-time operating power of the target area exceeds the preset maximum operating power of the target area, the required transfer power of the flexible interconnection device corresponding to the target area is determined according to the preset maximum operating power of the target area, the first real-time operating power of the target area, and the second real-time operating power of the flexible interconnection device corresponding to the target area; If the first real-time operating power of the target area exceeds the preset minimum operating power of the target area, the required transfer power of the flexible interconnection device corresponding to the target area is determined according to the preset minimum operating power of the target area, the first real-time operating power of the target area, and the second real-time operating power of the flexible interconnection device corresponding to the target area; Determine the expected transfer power of the flexible interconnection device corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area; According to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area, the flexible interconnection device corresponding to the target area is controlled to transfer power.

2. The method for controlling the voltage in a substation according to claim 1, characterized in that: The method further comprises: According to the rated power of the flexible interconnection device corresponding to the target area, the demand transfer power of the flexible interconnection device corresponding to the target area is limited so that the demand transfer power after the limiting processing is within a first demand power range, and the first demand power range is: greater than or equal to the negative rated power, and less than or equal to the preset reference power. According to the rated power of the flexible interconnection device corresponding to the target substation, the demand transfer power of the flexible interconnection device corresponding to the target substation is limited so that the demand transfer power after the limiting processing is within a second demand power range, and the second demand power range is: a power range greater than or equal to a preset reference power and less than or equal to the positive rated power.

3. The method for controlling the voltage in a substation according to claim 1, characterized in that: The step of determining the expected transfer power of the flexible interconnection device corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area includes: According to the required transfer power of the flexible interconnection device corresponding to the target area and the total number of preset areas, the expected transfer power of the flexible interconnection device corresponding to other areas is calculated.

4. The method for controlling the voltage in a metropolitan area according to claim 1, characterized in that: After determining the expected transfer powers of the flexible interconnection devices corresponding to other areas according to the required transfer power of the flexible interconnection device corresponding to the target area, the method further includes: According to the preset allowable operating power range of the flexible interconnection device corresponding to the other areas, the expected transfer power of the flexible interconnection device corresponding to the other areas is limited, so that the limited expected transfer power is within the preset operating power range.

5. The method for controlling the voltage in a metropolitan area according to claim 4, characterized in that: The method further includes: performing a limiting process on the expected transfer power of the flexible interconnection device corresponding to the other area according to the preset allowable operating power range of the flexible interconnection device corresponding to the other area, so that the expected transfer power subjected to the limiting process is within the preset operating power range; Calculate the maximum allowable operating power of the other substations according to the preset maximum operating power of the transformer in the other substations, the first real-time operating power, and the second real-time operating power of the corresponding flexible interconnection device; The minimum allowable operating power of the other substations is calculated based on the preset minimum operating power of the transformer in the other substations, the first real-time operating power and the second real-time operating power of the corresponding flexible interconnection device; wherein the preset allowable operating power range is: a power range greater than or equal to the minimum allowable operating power and less than or equal to the maximum allowable operating power.

6. The method for controlling the voltage in a metro station according to claim 5, characterized in that: The method further comprises: According to the rated power of the flexible interconnection device corresponding to the other substations, the maximum allowable operating power of the other substations is limited, so that the maximum allowable operating power after the limiting processing is within a third required power range, and the third required power range is: a power range greater than or equal to a preset reference power and less than or equal to the positive rated power; According to the rated power of the flexible interconnection device corresponding to the other substations, the minimum allowable operating power of the other substations is limited so that the minimum allowable operating power after the limiting process is within a fourth required power range, and the fourth required power range is: a power range greater than or equal to the negative rated power and less than or equal to a preset reference power.

7. The method for controlling the voltage in a metro station according to claim 1, characterized in that: The controlling the target area corresponding flexible interconnection device to transfer power according to the required transfer power and the expected transfer power of the target area corresponding flexible interconnection device comprises: Calculate the total output power of the flexible interconnection device corresponding to the target area according to the required transfer power and the expected transfer power of the flexible interconnection device corresponding to the target area; According to the total output power, the flexible interconnection device corresponding to the target area is controlled to transfer power.

8. The method for controlling the voltage in a metro station according to claim 7, characterized in that: Before controlling the flexible interconnection device corresponding to the target area to transfer power according to the total output power, the method further includes: According to the preset allowable operating power range of the flexible interconnection device corresponding to the target area, the total output power is limited so that the total output power after the limiting process is within the preset allowable operating power range.

9. A substation interconnection system, characterized in that: The station area interconnection system includes: a plurality of flexible interconnection devices and control equipment; Wherein, the control device is communicatively connected with the multiple flexible interconnection devices, and the multiple flexible interconnection devices are also electrically connected to a preset DC bus; the control device is used to execute the substation voltage control method described in any one of claims 1-8.

10. An energy storage system, characterized in that: include: The substation interconnection system and multiple energy storage units as described in claim 9 above; The multiple energy storage units are electrically connected to multiple flexible interconnection devices in the substation interconnection system, and the multiple energy storage units are also electrically connected to the preset DC bus; the multiple energy storage units are communicatively connected to the control equipment in the substation interconnection system.

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