Transfer frequency converter capacity configuration method for transmitting end power frequency / low frequency asynchronous networking

Abstract

The invention discloses a transmitting end power frequency / low frequency asynchronous networking transfer frequency converter capacity configuration method and system. The method comprises the following steps: determining power frequency part parameters and low frequency part parameters of a target transmitting end power grid; performing simulation calculation to respectively obtain the transient stability limit of the power frequency delivery channel and the transient stability limit of the low frequency delivery channel; based on the power frequency part parameter, the low frequency part parameter, the transient stability limit of the power frequency outgoing channel and the transient stability limit of the low frequency outgoing channel, the low frequency outgoing channel is determined; determining the overall delivery capacity of the target sending end power grid under the condition that the sending end is not provided with the transfer frequency converter and the maximum overall delivery capacity of the target sending end power grid under the condition that the sending end is provided with the transfer frequency converter; and determining the configuration capacity of the transfer frequency converter configured at the sending end based on the overall delivery capacity of the target sending end power grid under the condition that the transfer frequency converter is not configured at the sending end and the maximum overall delivery capacity of the target sending end power grid under the condition that the transfer frequency converter is configured at the sending end.

Description

Technical Field

[0001] This invention relates to the field of power and electrical engineering technology, and more specifically, to a method and system for configuring the capacity of a transfer frequency converter in a power frequency / low frequency asynchronous interconnection at the sending end. Background Technology

[0002] The basic principle of flexible low-frequency AC power transmission, such as Figure 1 As shown. By utilizing power electronics technology, a suitable frequency of 0-50Hz can be flexibly selected, and an effective conversion between power frequency and low frequency can be achieved through a high-voltage, high-capacity AC / AC frequency converter to improve the power grid's transmission capacity and flexible control level. This is a new type of efficient AC power transmission technology.

[0003] With the development of power electronics technology, flexible low-frequency AC transmission has become feasible. Power units such as wind power, photovoltaic, hydropower, or pumped storage can directly output low-frequency power, which is then transmitted through transmission lines to the receiving-end power grid frequency converter station. The low-frequency power is then converted between power frequency and low frequency through an AC-AC frequency converter, and subsequently connected to the power frequency grid.

[0004] In terms of flexible regulation and networking, flexible low-frequency AC transmission has the same power control, reactive power compensation, dynamic voltage support, and asynchronous grid interconnection functions as flexible DC transmission; in addition, it is compatible with power frequency lines, has alternating AC system and zero-crossing breaking capability, and has outstanding networking advantages.

[0005] Furthermore, the phase between power and low frequency can be independently controlled, enabling asynchronous AC interconnection between power frequency grids, such as... Figure 2 As shown, the problem of power angle stability in long-chain circuits can be solved, and power supply support characteristics such as frequency and voltage can be achieved by combining power control.

[0006] For sending-end power grids that simultaneously have power frequency and low-frequency AC transmission channels, configuring a transfer inverter between these channels can enable the power frequency and low-frequency systems to serve as backups for each other in the event of a fault in either channel, thereby improving overall transmission capacity. However, the power grid's transmission capacity is limited by various factors, and inverters are relatively expensive. Currently, there is no clear method to fully utilize the transfer inverter to maximize the power grid's transmission capacity.

[0007] Therefore, there is an urgent need for a method to configure the capacity of a transfer frequency converter for asynchronous networking of power frequency / low frequency at the sending end. Summary of the Invention

[0008] This invention proposes a method and system for configuring the capacity of a transfer frequency converter in a power frequency / low frequency asynchronous interconnection at the sending end, in order to solve the problem of how to configure the capacity of the transfer frequency converter to maximize the power transmission capacity.

[0009] To solve the above problems, according to one aspect of the present application, a method for configuring capacity of a belt-drive frequency converter for sending-end power frequency / low frequency asynchronous networking is provided, the method comprising:

[0010] determining power frequency part parameters and low frequency part parameters of a target sending-end power grid;

[0011] establishing simulation calculation data containing the target sending-end power grid, and performing simulation calculation based on the simulation calculation data to obtain transient stability limit of a power frequency external sending channel and transient stability limit of a low frequency external sending channel respectively;

[0012] based on the power frequency part parameters, the low frequency part parameters, the transient stability limit of the power frequency external sending channel and the transient stability limit of the low frequency external sending channel, determining overall external sending capacity of the target sending-end power grid under a condition that no belt-drive frequency converter is configured at the sending end and maximum overall external sending capacity that can be reached by the target sending-end power grid under a condition that a belt-drive frequency converter is configured at the sending end;

[0013] based on the overall external sending capacity of the target sending-end power grid under the condition that no belt-drive frequency converter is configured at the sending end and the maximum overall external sending capacity that can be reached by the target sending-end power grid under the condition that a belt-drive frequency converter is configured at the sending end, determining configuration capacity of the belt-drive frequency converter configured at the sending end.

[0014] Preferably, wherein the simulation calculation is performed to obtain the transient stability limit of the power frequency external sending channel and the transient stability limit of the low frequency external sending channel respectively, comprising:

[0015] performing three permanent N-1 fault simulation on any return AC line in the power frequency external sending channel, if the system can stably operate after the fault, then continue to increase power flow of the power frequency external sending channel, if the system cannot stably operate after the fault, then back off the power flow of the power frequency external sending channel to the value before the increase, and determine the value as the transient stability limit of the power frequency external sending channel;

[0016] performing three permanent N-1 fault simulation on any return AC line in the low frequency external sending channel, if the system can stably operate after the fault, then continue to increase power flow of the low frequency external sending channel, if the system cannot stably operate after the fault, then back off the power flow of the low frequency external sending channel to the value before the increase, and determine the value as the transient stability limit of the low frequency external sending channel.

[0017] Preferably, wherein based on the power frequency part parameters, the low frequency part parameters, the transient stability limit of the power frequency external sending channel and the transient stability limit of the low frequency external sending channel, determining the overall external sending capacity of the target sending-end power grid under the condition that no belt-drive frequency converter is configured at the sending end and the maximum overall external sending capacity that can be reached by the target sending-end power grid under the condition that a belt-drive frequency converter is configured at the sending end, comprises:

[0018] based on HS PF = C PF *(NPF -1) Calculate the thermal stability limit HS of the power frequency transmission channel PF and based on TC PF =min{HS PF ,TS PF Calculate the power frequency transmission capacity (TC) of the external transmission channel. PF ;

[0019] Based on HS LF =C LF *(N LF -1) Calculate the thermal stability limit HS of the low-frequency transmission channel LF And based on TC LF =min{HS LF ,TS LF Calculate the transmission capacity (TC) of the low-frequency power transmission channel. LF ;

[0020] Based on TC A =TC PF +TC LF Calculate the overall power transmission capacity (TC) of the target power grid when the sending end is not equipped with a frequency converter. A ;

[0021] Based on TC AP =TC PF +C LF *N LF Calculate the maximum overall transmission capacity (TC) of the power frequency transmission line after a triple N-1 fault occurs. AP ;

[0022] Based on TC AL =TC LF +C PF *N PF Calculate the overall transmission capacity (TC) of the low-frequency transmission line after a triple N-1 fault. AL ;

[0023] Based on TC AM =min{TC AP ,TC AL Calculate the maximum overall power transmission capacity (TC) that the target sending-end power grid can achieve. AM ;

[0024] Where, N PF C represents the number of AC lines for power frequency transmission channels. PF The maximum capacity of each AC line; TS PF The transient stability limit of the power frequency transmission channel; TS LF N represents the transient stability limit of the low-frequency transmission channel. LF For the number of AC lines in the low-frequency transmission channel, C LFThis is the maximum capacity of each AC line.

[0025] Preferably, the determination of the configuration capacity of the transfer frequency converter at the sending end is based on the overall transmission capacity of the target sending-end power grid without a transfer frequency converter and the maximum overall transmission capacity that the target sending-end power grid can achieve with a transfer frequency converter at the sending end, including:

[0026] C TS =(TC AM -TC A ) / 2,

[0027] Among them, C TS Configure capacity for the transfer frequency converter; TC A This refers to the overall power transmission capacity of the target power grid when no frequency converter is configured at the sending end; TC AM The maximum overall power transmission capacity that the target power grid can achieve when a frequency converter is configured at the sending end.

[0028] Preferably, the method further includes:

[0029] Based on C AR =(TC AM -TC PF )-C TR Calculate the required additional inverter capacity C at the receiving end of the low-frequency transmission channel. AR ;

[0030] Based on F P =TC PF +C TS and F L =TC LF +C TS Calculate the target sending-end power grid's maximum overall power transmission capacity (TC) under the condition that the sending end is equipped with a frequency converter. AM Time-frequency external transmission channel flow F P and low-frequency transmission channel trend F L ;

[0031] Among them, TC AM The overall power transmission capacity of the target power grid under the condition of configuring a transfer frequency converter at the sending end; TC PF For power frequency transmission channel power transmission capacity; C TR For the low-frequency transmission channel receiving-end inverter capacity; TC LF For low-frequency power transmission channel capacity; C TS Configure capacity for the frequency converter.

[0032] According to another aspect of the present invention, a capacity configuration system for a transfer frequency converter with a sending-end power frequency / low frequency asynchronous interconnection is provided, the system comprising:

[0033] The parameter determination unit is used to determine the power frequency and low frequency parameters of the target sending-end power grid.

[0034] The transient stability limit determination unit is used to establish simulation calculation data including the target sending-end power grid, and to perform simulation calculations based on the simulation calculation data to obtain the transient stability limit of the power frequency transmission channel and the transient stability limit of the low frequency transmission channel, respectively.

[0035] The external transmission capacity determination unit is used to determine the overall external transmission capacity of the target sending-end power grid under the condition that the sending end is not equipped with a transfer frequency converter, and the maximum overall external transmission capacity that the target sending-end power grid can achieve under the condition that the sending end is equipped with a transfer frequency converter, based on the power frequency part parameters, low frequency part parameters, transient stability limit of the power frequency external transmission channel and transient stability limit of the low frequency external transmission channel.

[0036] The configuration capacity determination unit is used to determine the configuration capacity of the transfer frequency converter configured at the sending end based on the overall transmission capacity of the target sending end power grid when no transfer frequency converter is configured at the sending end and the maximum overall transmission capacity that the target sending end power grid can achieve when a transfer frequency converter is configured at the sending end.

[0037] Preferably, the transient stability limit determination unit performs simulation calculations to obtain the transient stability limits of the power frequency transmission channel and the low frequency transmission channel, respectively, including:

[0038] Perform a three-terminal N-1 fault simulation on any AC line in the power frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the power frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the power frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the power frequency transmission channel.

[0039] Perform a three-terminal N-1 fault simulation on any AC line in the low-frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the low-frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the low-frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the low-frequency transmission channel.

[0040] Preferably, the transmission capacity determining unit, based on the power frequency parameters, low frequency parameters, transient stability limits of the power frequency transmission channel, and transient stability limits of the low frequency transmission channel, determines the overall transmission capacity of the target power grid without a transfer inverter at the sending end and the maximum overall transmission capacity achievable by the target power grid with a transfer inverter at the sending end, including:

[0041] Based on HS PF =C PF *(N PF-1) Calculate the thermal stability limit HS of the power frequency transmission channel PF And based on TC PF =min{HS PF ,TS PF Calculate the power frequency transmission capacity (TC) of the external transmission channel. PF ;

[0042] Based on HS LF =C LF *(N LF -1) Calculate the thermal stability limit HS of the low-frequency transmission channel LF And based on TC LF =min{HS LF ,TS LF Calculate the transmission capacity (TC) of the low-frequency power transmission channel. LF ;

[0043] Based on TC A =TC PF +TC LF Calculate the overall power transmission capacity (TC) of the target power grid when the sending end is not equipped with a frequency converter. A ;

[0044] Based on TC AP =TC PF +C LF *N LF Calculate the maximum overall transmission capacity (TC) of the power frequency transmission line after a triple N-1 fault occurs. AP ;

[0045] Based on TC AL =TC LF +C PF *N PF Calculate the overall transmission capacity (TC) of the low-frequency transmission line after a triple N-1 fault. AL ;

[0046] Based on TC AM =min{TC AP ,TC AL Calculate the maximum overall power transmission capacity (TC) that the target sending-end power grid can achieve. AM ;

[0047] Where, N PF C represents the number of AC lines for power frequency transmission channels. PF The maximum capacity of each AC line; TS PF The transient stability limit of the power frequency transmission channel; TS LF N represents the transient stability limit of the low-frequency transmission channel. LF For the number of AC lines in the low-frequency transmission channel, C LFThis is the maximum capacity of each AC line.

[0048] Preferably, the configuration capacity determination unit determines the configuration capacity of the transfer frequency converter configured at the sending end based on the overall transmission capacity of the target sending-end power grid without a transfer frequency converter and the maximum overall transmission capacity that the target sending-end power grid can achieve with a transfer frequency converter configured at the sending end, including:

[0049] C TS =(TC AM -TC A ) / 2,

[0050] Among them, C TS Configure capacity for the transfer frequency converter; TC A This refers to the overall power transmission capacity of the target power grid when no frequency converter is configured at the sending end; TC AM The maximum overall power transmission capacity that the target power grid can achieve when a frequency converter is configured at the sending end.

[0051] Preferably, the system further includes:

[0052] Inverter capacity calculation unit, used for C AR =(TC AM -TC PF )-C TR Calculate the required additional inverter capacity C at the receiving end of the low-frequency transmission channel. AR ;

[0053] Channel power flow calculation unit, used for F P =TC PF +C TS and F L =TC LF +C TS Calculate the target sending-end power grid's maximum overall power transmission capacity (TC) under the condition that the sending end is equipped with a frequency converter. AM Time-frequency external transmission channel flow F P and low-frequency transmission channel trend F L ;

[0054] Among them, TC AM The overall power transmission capacity of the target power grid under the condition of configuring a transfer frequency converter at the sending end; TC PF For power frequency transmission channel power transmission capacity; C TR For the low-frequency transmission channel receiving-end inverter capacity; TC LF For low-frequency power transmission channel capacity; C TS Configure capacity for the frequency converter.

[0055] Based on another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the steps in a method for configuring the capacity of a transfer inverter in a power frequency / low frequency asynchronous network at the sending end.

[0056] According to another aspect of the present invention, the present invention provides an electronic device, comprising:

[0057] The aforementioned computer-readable storage medium; and

[0058] One or more processors for executing a program in the computer-readable storage medium.

[0059] This invention provides a method and system for configuring the capacity of a transfer inverter in an asynchronous power frequency / low frequency grid interconnection at the sending end. The method includes: determining the power frequency parameters and low frequency parameters of the target sending-end power grid; establishing simulation calculation data including the target sending-end power grid, and performing simulation calculations based on the simulation calculation data to obtain the transient stability limits of the power frequency transmission channel and the low frequency transmission channel, respectively; determining the overall transmission capacity of the target sending-end power grid without a transfer inverter and the maximum overall transmission capacity achievable by the target sending-end power grid with a transfer inverter, based on the power frequency parameters, low frequency parameters, the transient stability limits of the power frequency transmission channel and the low frequency transmission channel; and determining the configuration capacity of the transfer inverter configured at the sending end based on the overall transmission capacity of the target sending-end power grid without a transfer inverter and the maximum overall transmission capacity achievable by the target sending-end power grid with a transfer inverter. This invention achieves asynchronous flexible interconnection of the power frequency and low frequency power grids by configuring a transfer inverter between the parallel power frequency AC transmission channels and low frequency AC transmission channels of the sending-end power grid. After a line fault occurs in the power frequency AC transmission channel or the low frequency AC transmission channel, part of the power flow is transferred to the low frequency side / power frequency side, so that the power flow of the power frequency AC transmission channel and the low frequency AC transmission channel during normal operation can exceed the transmission capacity of their respective channels, thereby improving the overall transmission capacity of the sending-end system. At the same time, by rationally arranging the power flow of the power frequency AC transmission channel and the low frequency AC transmission channel during normal operation, the required additional inverter capacity is minimized. Attached Figure Description

[0060] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0061] Figure 1 This is a basic schematic diagram of flexible low-frequency AC power transmission.

[0062] Figure 2 A schematic diagram illustrating the asynchronous AC interconnection between power frequency grids;

[0063] Figure 3 A flowchart of a transfer inverter capacity configuration method 300 for asynchronous interconnection of power frequency / low frequency at the sending end according to an embodiment of the present invention;

[0064] Figure 4 This is a schematic diagram of a simplified power grid model with power frequency transmission channels and low frequency transmission channels arranged in parallel according to an embodiment of the present invention.

[0065] Figure 5 This is a structural schematic diagram of a capacity configuration system 500 for a transmission frequency / low frequency asynchronous interconnection frequency converter according to an embodiment of the present invention. Detailed Implementation

[0066] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0067] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0068] This invention achieves asynchronous flexible interconnection of the power frequency and low frequency power grids by configuring a transfer inverter between the parallel power frequency AC transmission channels and low frequency AC transmission channels of the sending-end power grid. After a line fault occurs in the power frequency AC transmission channel or the low frequency AC transmission channel, part of the power flow is transferred to the low frequency side / power frequency side, so that the power flow of the power frequency AC transmission channel and the low frequency AC transmission channel during normal operation can exceed the transmission capacity of their respective channels, thereby improving the overall transmission capacity of the sending-end system. At the same time, by rationally arranging the power flow of the power frequency AC transmission channel and the low frequency AC transmission channel during normal operation, the required additional inverter capacity is minimized.

[0069] Figure 3 This is a flowchart of a method 300 for configuring the capacity of a transfer inverter in an asynchronous network of power frequency / low frequency interconnection at the sending end, according to an embodiment of the present invention. Figure 3As shown in the figure, the present invention provides a method for configuring the capacity of a transfer inverter in a sending-end power frequency / low-frequency asynchronous interconnection. By configuring a transfer inverter between the parallel power frequency AC transmission channels and low-frequency AC transmission channels of the sending-end power grid, asynchronous flexible interconnection of the power frequency / low-frequency power grids is achieved. After a line fault in the power frequency AC transmission channel / low-frequency AC transmission channel, part of the power flow is transferred to the low-frequency side / power frequency side, ensuring that the power flow during normal operation of the power frequency AC transmission channel and the low-frequency AC transmission channel exceeds the transmission capacity of their respective channels, thereby improving the overall transmission capacity of the sending-end system. Simultaneously, by rationally arranging the power flow during normal operation of the power frequency AC transmission channel and the low-frequency transmission channel, the required increase in inverter capacity is minimized. The method 300 for configuring the capacity of a transfer inverter in a sending-end power frequency / low-frequency asynchronous interconnection provided by the present invention begins at step 301, where the power frequency parameters and low-frequency parameters of the target sending-end power grid are determined.

[0070] In this invention, it is necessary to determine the basic conditions of the power frequency and low frequency components of the power grid at the sending end, including: determining the number N of AC lines for power frequency transmission channels. PF The maximum capacity C of each AC line PF Number of low-frequency transmission channel AC lines N LF The maximum capacity C of each AC line LF and the capacity C of the receiving-end inverter for the low-frequency transmission channel TR .

[0071] In step 302, simulation calculation data containing the target sending-end power grid is established, and simulation calculations are performed based on the simulation calculation data to obtain the transient stability limit of the power frequency transmission channel and the transient stability limit of the low frequency transmission channel, respectively.

[0072] Preferably, the simulation calculations performed to obtain the transient stability limits of the power frequency transmission channel and the low-frequency transmission channel respectively include:

[0073] Perform a three-terminal N-1 fault simulation on any AC line in the power frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the power frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the power frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the power frequency transmission channel.

[0074] Perform a three-terminal N-1 fault simulation on any AC line in the low-frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the low-frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the low-frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the low-frequency transmission channel.

[0075] In this invention, by establishing simulation calculation data containing the sending-end power grid, and performing simulation calculations based on the simulation calculation data, the transient stability limits of the power frequency transmission channel and the low-frequency transmission channel are obtained respectively. Specifically, it includes: (1) establishing electromechanical transient or electromagnetic transient simulation calculation data containing the sending-end power grid; (2) performing a three-terminal N-1 fault simulation on one of the AC lines of the power frequency transmission channel. If the system can operate stably after the fault, the power flow of the power frequency transmission channel is increased. If the system cannot operate stably after the fault, the power flow of the power frequency transmission channel is rolled back to the value before the increase. This value is the transient stability limit TS of the power frequency transmission channel. PF (3) Perform a three-terminal N-1 fault simulation on one of the AC lines of the low-frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the low-frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the low-frequency transmission channel to the value before the increase. This value is the transient stability limit TS of the low-frequency transmission channel. LF .

[0076] In step 303, based on the power frequency parameters, low frequency parameters, transient stability limit of the power frequency transmission channel, and transient stability limit of the low frequency transmission channel, the overall transmission capacity of the target power grid without a transfer frequency converter and the maximum overall transmission capacity that the target power grid can achieve with a transfer frequency converter are determined.

[0077] Preferably, based on the power frequency parameters, low frequency parameters, transient stability limits of the power frequency transmission channel, and transient stability limits of the low frequency transmission channel, the overall transmission capacity of the target power grid without a transfer inverter and the maximum overall transmission capacity achievable by the target power grid with a transfer inverter are determined, including:

[0078] Based on HS PF =C PF *(N PF -1) Calculate the thermal stability limit HS of the power frequency transmission channel PF And based on TC PF =min{HS PF ,TS PF Calculate the power frequency transmission capacity (TC) of the external transmission channel. PF ;

[0079] Based on HS LF =C LF *(N LF -1) Calculate the thermal stability limit HS of the low-frequency transmission channel LF And based on TC LF =min{HS LF ,TS LF Calculate the transmission capacity (TC) of the low-frequency power transmission channel.LF ;

[0080] Based on TC A =TC PF +TC LF Calculate the overall power transmission capacity (TC) of the target power grid when the sending end is not equipped with a frequency converter. A ;

[0081] Based on TC AP =TC PF +C LF *N LF Calculate the maximum overall transmission capacity (TC) of the power frequency transmission line after a triple N-1 fault occurs. AP ;

[0082] Based on TC AL =TC LF +C PF *N PF Calculate the overall transmission capacity (TC) of the low-frequency transmission line after a triple N-1 fault. AL ;

[0083] Based on TC AM =min{TC AP ,TC AL Calculate the maximum overall power transmission capacity (TC) that the target sending-end power grid can achieve. AM ;

[0084] Where, N PF C represents the number of AC lines for power frequency transmission channels. PF The maximum capacity of each AC line; TS PF The transient stability limit of the power frequency transmission channel; TS LF N represents the transient stability limit of the low-frequency transmission channel. LF For the number of AC lines in the low-frequency transmission channel, C LF This is the maximum capacity of each AC line.

[0085] In this invention, the overall power transmission capacity TC of the power grid at the sending end is first determined under the condition that there is no frequency converter at the sending end. A ,include:

[0086] (1) Calculate the thermal stability limit HS of the power frequency transmission channel PF =C PF *(N PF -1), according to HS PF and the TS obtained in step 2 PF The power frequency transmission capacity TC of the external transmission channel is obtained. PF =min{HS PF ,TS PF}

[0087] (2) Calculate the thermal stability limit HS of the low-frequency transmission channel LF =C LF *(N LF -1), according to HS LF and the TS obtained in step 2 LF The low-frequency power transmission capacity TC is obtained. LF =min{HS LF ,TS LF}

[0088] (3) Calculate the overall export capacity TC A =TC PF +TC LF .

[0089] Then, determine the maximum overall external transmission capacity TC that can be achieved under the condition of configuring a frequency converter at the sending end. AM ,include:

[0090] (1) Calculate the maximum overall transmission capacity TC after the power frequency transmission channel line experiences a triple N-1 fault. AP =TC PF +C LF *N LF .

[0091] (2) Calculate the maximum overall transmission capacity TC after a triple N-1 fault occurs in the low-frequency transmission channel. AL =TC LF +C PF *N PF .

[0092] (3) Calculate TC AM =min{TC AP ,TC AL}

[0093] In step 304, based on the overall transmission capacity of the target sending-end power grid without a transfer frequency converter and the maximum overall transmission capacity that the target sending-end power grid can achieve with a transfer frequency converter, the configuration capacity of the transfer frequency converter at the sending end is determined.

[0094] Preferably, the determination of the configuration capacity of the transfer frequency converter at the sending end is based on the overall transmission capacity of the target sending-end power grid without a transfer frequency converter and the maximum overall transmission capacity that the target sending-end power grid can achieve with a transfer frequency converter at the sending end, including:

[0095] C TS =(TC AM -TC A ) / 2,

[0096] Among them, C TS Configure capacity for the transfer frequency converter; TC A This refers to the overall power transmission capacity of the target power grid when no frequency converter is configured at the sending end; TC AM The maximum overall power transmission capacity that the target power grid can achieve when a frequency converter is configured at the sending end.

[0097] Preferably, the method further includes:

[0098] Based on C AR =(TC AM -TC PF )-C TR Calculate the required additional inverter capacity C at the receiving end of the low-frequency transmission channel. AR ;

[0099] Based on F P =TC PF +C TS and F L =TC LF +C TS Calculate the target sending-end power grid's maximum overall power transmission capacity (TC) under the condition that the sending end is equipped with a frequency converter. AM Time-frequency external transmission channel flow F P and low-frequency transmission channel trend F L ;

[0100] Among them, TC AM The overall power transmission capacity of the target power grid under the condition of configuring a transfer frequency converter at the sending end; TC PF For power frequency transmission channel power transmission capacity; C TR For the low-frequency transmission channel receiving-end inverter capacity; TC LF For low-frequency power transmission channel capacity; C TS Configure capacity for the frequency converter.

[0101] In this invention, the required capacity of the transmitter-end frequency converter is determined to be C based on the above parameters. TS =(TC AM -TC A ) / 2.

[0102] It can also determine the required increase in inverter capacity C at the receiving end of the low-frequency transmission channel. AR And to achieve maximum overall delivery capacity TC AM At that time, the power flow allocated on the power frequency transmission channel and the low frequency transmission channel includes: calculating C AR =(TC AM -TC PF )-C TR ; Calculate the maximum overall transmission capacity TCAM At that time, the power flow of the power frequency transmission channel is F. P =TC PF +C TS The low-frequency external transmission channel current is F L =TC LF +C TS .

[0103] The following specific examples illustrate the embodiments of the present invention.

[0104] like Figure 4 The figure shows a simplified power grid model with power frequency transmission channels and low frequency transmission channels running side by side. Simulation calculation data is established based on this power grid structure.

[0105] The power frequency transmission channel consists of two 1000kV AC lines, each with a maximum capacity of 10000MW, i.e., N. PF =2, C PF =10000MW.

[0106] The low-frequency transmission channel consists of two 1000kV AC lines, each with a maximum capacity of 10000MW, i.e., N. LF =2, C LF =10000MW. The capacity of the receiving-end inverter in the low-frequency transmission channel is 10000MW, i.e., C TR =10000MW.

[0107] Three-terminal N-1 fault simulation was performed on the power frequency transmission line to obtain its transient stability limit TS. PF =5400MW.

[0108] Three-terminal N-1 fault simulation was performed on the low-frequency transmission line to obtain its transient stability limit TS. LF =15000MW.

[0109] HS PF =C PF *(N PF -1)=10000MW.

[0110] HS LF =C LF *(N LF -1)=10000MW.

[0111] TC PF =min{HS PF ,TS PF}=min{10000MW,5400MW}=5400MW

[0112] TC LF =min{HS LF,TS LF}=min{10000MW,15000MW}=10000MW.

[0113] TC A =TC PF +TC LF =5400MW+10000MW=15400MW.

[0114] Without a frequency converter at the transmitting end, the overall external transmission capacity is 15400MW.

[0115] TC AP =TC PF +C LF *N LF =5400MW+10000MW*2=25400MW.

[0116] TC AL =TC LF +C PF *N PF =10000MW+10000MW*2=30000MW.

[0117] TC AM =min{TC AP ,TC AL}=min{25400MW,30000MW}=25400MW.

[0118] With a frequency converter configured at the sending end, the maximum overall external transmission capacity that can be achieved is 25,400 MW.

[0119] C TS =(TC AM -TC A ) / 2=(25400MW-15400MW) / 2=5000MW.

[0120] C AR =(TC AM -TC PF )-C TR =(25400MW-5400MW)-10000MW=10000MW.

[0121] The required capacity of the frequency converter at the sending end is 5000MW, and the required capacity of the frequency converter at the receiving end of the low-frequency transmission channel is 10000MW.

[0122] F P =TC PF +C TS =5400MW+5000MW=10400MW.

[0123] F L =TC LF +C TS =10000MW+5000MW=15000MW.

[0124] That is, after configuring the frequency converter, the maximum power flow of the power frequency transmission channel is 10400MW, and the maximum power flow of the low frequency transmission channel is 15000MW.

[0125] After a three-terminal N-1 fault occurs on the power frequency transmission line, the 5000MW power flow is transferred to the low-frequency transmission line via a frequency converter. The power flow of the power frequency transmission line drops to 5400MW, which does not exceed its transmission capacity TC. PF .

[0126] After a triple N-1 fault occurs on the low-frequency power transmission line, the 5000MW power flow is transferred to the power frequency power transmission line via a transfer inverter. The power flow of the low-frequency power transmission line drops to 10000MW, which does not exceed its transmission capacity TC. LF .

[0127] By configuring a transfer frequency converter and increasing the capacity of the receiving-end frequency converter in the low-frequency system, the overall power transmission capacity was increased from 15,400MW to 25,400MW, an increase of 10,000MW.

[0128] Figure 5 This is a schematic diagram of the capacity configuration system 500 for a transmission frequency / low frequency asynchronous interconnected frequency converter according to an embodiment of the present invention. Figure 5 As shown, the capacity configuration system 500 for a transfer frequency converter with asynchronous network connection at the sending end of the present invention includes: a parameter determination unit 501, a transient stability limit determination unit 502, an external transmission capacity determination unit 503, and a configuration capacity determination unit 504.

[0129] Preferably, the parameter determination unit 501 is used to determine the power frequency parameters and low frequency parameters of the target sending-end power grid.

[0130] Preferably, the transient stability limit determination unit 502 is used to establish simulation calculation data including the target sending-end power grid, and perform simulation calculations based on the simulation calculation data to obtain the transient stability limit of the power frequency transmission channel and the transient stability limit of the low frequency transmission channel, respectively.

[0131] Preferably, the transient stability limit determination unit 502 performs simulation calculations to obtain the transient stability limits of the power frequency transmission channel and the low frequency transmission channel, respectively, including:

[0132] Perform a three-terminal N-1 fault simulation on any AC line in the power frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the power frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the power frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the power frequency transmission channel.

[0133] Perform a three-terminal N-1 fault simulation on any AC line in the low-frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the low-frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the low-frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the low-frequency transmission channel.

[0134] Preferably, the transmission capacity determination unit 503 is used to determine the overall transmission capacity of the target power grid when the sending end is not equipped with a transfer frequency converter, and the maximum overall transmission capacity that the target power grid can achieve when the sending end is equipped with a transfer frequency converter, based on the power frequency part parameters, low frequency part parameters, transient stability limit of the power frequency transmission channel and transient stability limit of the low frequency transmission channel.

[0135] Preferably, the transmission capacity determination unit 503, based on the power frequency parameters, low frequency parameters, transient stability limits of the power frequency transmission channel, and transient stability limits of the low frequency transmission channel, determines the overall transmission capacity of the target power grid without a transfer inverter at the sending end and the maximum overall transmission capacity achievable by the target power grid with a transfer inverter at the sending end, including:

[0136] Based on HS PF =C PF *(N PF -1) Calculate the thermal stability limit HS of the power frequency transmission channel PF And based on TC PF =min{HS PF ,TS PF Calculate the power frequency transmission capacity (TC) of the external transmission channel. PF ;

[0137] Based on HS LF =C LF *(N LF -1) Calculate the thermal stability limit HS of the low-frequency transmission channel LF And based on TC LF =min{HS LF ,TS LF Calculate the transmission capacity (TC) of the low-frequency power transmission channel. LF ;

[0138] Based on TC A =TC PF +TCLF Calculate the overall power transmission capacity (TC) of the target power grid when the sending end is not equipped with a frequency converter. A ;

[0139] Based on TC AP =TC PF +C LF *N LF Calculate the maximum overall transmission capacity (TC) of the power frequency transmission line after a triple N-1 fault occurs. AP ;

[0140] Based on TC AL =TC LF +C PF *N PF Calculate the overall transmission capacity (TC) of the low-frequency transmission line after a triple N-1 fault. AL ;

[0141] Based on TC AM =min{TC AP ,TC AL Calculate the maximum overall power transmission capacity (TC) that the target sending-end power grid can achieve. AM ;

[0142] Where, N PF C represents the number of AC lines for power frequency transmission channels. PF The maximum capacity of each AC line; TS PF The transient stability limit of the power frequency transmission channel; TS LF N represents the transient stability limit of the low-frequency transmission channel. LF For the number of AC lines in the low-frequency transmission channel, C LF This is the maximum capacity of each AC line.

[0143] Preferably, the configuration capacity determination unit 504 is used to determine the configuration capacity of the transfer frequency converter configured at the sending end based on the overall transmission capacity of the target sending end power grid under the condition that the sending end is not configured with a transfer frequency converter and the maximum overall transmission capacity that the target sending end power grid can achieve under the condition that the sending end is configured with a transfer frequency converter.

[0144] Preferably, the configuration capacity determination unit 504 determines the configuration capacity of the transfer frequency converter configured at the sending end based on the overall transmission capacity of the target sending-end power grid without a transfer frequency converter and the maximum overall transmission capacity that the target sending-end power grid can achieve with a transfer frequency converter configured at the sending end, including:

[0145] C TS =(TC AM -TC A ) / 2,

[0146] Among them, CTS Configure capacity for the transfer frequency converter; TC A This refers to the overall power transmission capacity of the target power grid when no frequency converter is configured at the sending end; TC AM The maximum overall power transmission capacity that the target power grid can achieve when a frequency converter is configured at the sending end.

[0147] Preferably, the system further includes:

[0148] Inverter capacity calculation unit, used for C AR =(TC AM -TC PF )-C TR Calculate the required additional inverter capacity C at the receiving end of the low-frequency transmission channel. AR ;

[0149] Channel power flow calculation unit, used for F P =TC PF +C TS and F L =TC LF +C TS Calculate the target sending-end power grid's maximum overall power transmission capacity (TC) under the condition that the sending end is equipped with a frequency converter. AM Time-frequency external transmission channel flow F P and low-frequency transmission channel trend F L ;

[0150] Among them, TC AM The overall power transmission capacity of the target power grid under the condition of configuring a transfer frequency converter at the sending end; TC PF For power frequency transmission channel power transmission capacity; C TR For the low-frequency transmission channel receiving-end inverter capacity; TC LF For low-frequency power transmission channel capacity; C TS Configure capacity for the frequency converter.

[0151] The capacity configuration system 500 for the transfer inverter with end-to-end power frequency / low frequency asynchronous networking in an embodiment of the present invention corresponds to the capacity configuration method 300 for the transfer inverter with end-to-end power frequency / low frequency asynchronous networking in another embodiment of the present invention, and will not be described again here.

[0152] Based on another aspect of the present invention, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the steps in a capacity configuration method for a transducer with an asynchronous network of power frequency / low frequency.

[0153] According to another aspect of the present invention, the present invention provides an electronic device, comprising:

[0154] The aforementioned computer-readable storage medium; and

[0155] One or more processors for executing a program in the computer-readable storage medium.

[0156] The present invention has been described with reference to a few embodiments. However, it will be apparent to those skilled in the art that other embodiments besides those disclosed above fall equivalently within the scope of the present invention.

[0157] Generally, all terms used in this invention are interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0158] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0159] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0160] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0161] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0162] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for configuring the capacity of a transfer frequency converter in a power frequency / low frequency asynchronous interconnection at the sending end, characterized in that, The method includes: Determine the power frequency and low frequency parameters of the target sending-end power grid; Establish simulation calculation data containing the target sending-end power grid, and perform simulation calculations based on the simulation calculation data to obtain the transient stability limit of the power frequency transmission channel and the transient stability limit of the low frequency transmission channel, respectively. Based on the power frequency parameters, low frequency parameters, transient stability limits of the power frequency transmission channel and the transient stability limits of the low frequency transmission channel, the overall transmission capacity of the target power grid without a transfer frequency converter and the maximum overall transmission capacity that the target power grid can achieve with a transfer frequency converter are determined. Based on the overall transmission capacity of the target sending-end power grid without a transfer frequency converter and the maximum overall transmission capacity that the target sending-end power grid can achieve with a transfer frequency converter, the configuration capacity of the transfer frequency converter at the sending end is determined.

2. The method according to claim 1, characterized in that, Simulation calculations were performed to obtain the transient stability limits of the power frequency transmission channel and the low frequency transmission channel, respectively, including: Perform a three-terminal N-1 fault simulation on any AC line in the power frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the power frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the power frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the power frequency transmission channel. Perform a three-terminal N-1 fault simulation on any AC line in the low-frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the low-frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the low-frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the low-frequency transmission channel.

3. The method according to claim 1, characterized in that, Based on the aforementioned power frequency parameters, low frequency parameters, transient stability limits of the power frequency transmission channel, and transient stability limits of the low frequency transmission channel, the overall transmission capacity of the target power grid without a transfer frequency converter at the sending end is determined, as well as the maximum overall transmission capacity achievable by the target power grid with a transfer frequency converter at the sending end is determined. include: Based on HS PF =C PF *(N PF -1) Calculate the thermal stability limit HS of the power frequency transmission channel PF And based on TC PF =min{HS PF ,TS PF Calculate the power frequency transmission capacity (TC) of the external transmission channel. PF ; Based on HS LF =C LF *(N LF -1) Calculate the thermal stability limit HS of the low-frequency transmission channel LF And based on TC LF =min{HS LF ,TS LF Calculate the transmission capacity (TC) of the low-frequency power transmission channel. LF ; Based on TC A =TC PF +TC LF Calculate the overall power transmission capacity (TC) of the target power grid when the sending end is not equipped with a frequency converter. A ; Based on TC AP =TC PF +C LF *N LF Calculate the maximum overall transmission capacity (TC) of the power frequency transmission line after a triple N-1 fault occurs. AP ; Based on TC AL =TC LF +C PF *N PF Calculate the overall transmission capacity (TC) of the low-frequency transmission line after a triple N-1 fault. AL ; Based on TC AM =min{TC AP ,TC AL Calculate the maximum overall power transmission capacity (TC) that the target sending-end power grid can achieve. AM ; Where, N PF C represents the number of AC lines for power frequency transmission channels. PF The maximum capacity of each AC line; TS PF The transient stability limit of the power frequency transmission channel; TS LF N represents the transient stability limit of the low-frequency transmission channel. LF For the number of AC lines in the low-frequency transmission channel, C LF This is the maximum capacity of each AC line.

4. The method according to claim 1, characterized in that, Based on the overall power transmission capacity of the target power grid without a transfer frequency converter at the sending end and the maximum overall power transmission capacity that the target power grid can achieve with a transfer frequency converter at the sending end, the configuration capacity of the transfer frequency converter at the sending end is determined. include: W TS =(TC AM -TC A ) / 2, Among them, C TS Configure capacity for the transfer frequency converter; TC A This refers to the overall power transmission capacity of the target power grid when no frequency converter is configured at the sending end; TC AM The maximum overall power transmission capacity that the target power grid can achieve when a frequency converter is configured at the sending end.

5. The method according to claim 1, characterized in that, The method further includes: Based on C AR =(TC AM -TC PF )-C TR Calculate the required additional inverter capacity C at the receiving end of the low-frequency transmission channel. AR ; Based on F P =TC PF +C TS and F L =TC LF +C TS Calculate the target sending-end power grid's maximum overall power transmission capacity (TC) under the condition that the sending end is equipped with a frequency converter. AM Time-frequency external transmission channel flow F P and low-frequency transmission channel trend F L ; Among them, TC AM The overall power transmission capacity of the target power grid under the condition of configuring a transfer frequency converter at the sending end; TC PF For power frequency transmission channel power transmission capacity; C TR For the low-frequency transmission channel receiving-end inverter capacity; TC LF For low-frequency power transmission channel capacity; C TS Configure capacity for the frequency converter.

6. A capacity configuration system for a transfer frequency converter with asynchronous interconnection of power frequency and low frequency at the sending end, characterized in that, The system includes: The parameter determination unit is used to determine the power frequency and low frequency parameters of the target sending-end power grid. The transient stability limit determination unit is used to establish simulation calculation data including the target sending-end power grid, and to perform simulation calculations based on the simulation calculation data to obtain the transient stability limit of the power frequency transmission channel and the transient stability limit of the low frequency transmission channel, respectively. The external transmission capacity determination unit is used to determine the overall external transmission capacity of the target sending-end power grid under the condition that the sending end is not equipped with a transfer frequency converter, and the maximum overall external transmission capacity that the target sending-end power grid can achieve under the condition that the sending end is equipped with a transfer frequency converter, based on the power frequency part parameters, low frequency part parameters, transient stability limit of the power frequency external transmission channel and transient stability limit of the low frequency external transmission channel. The configuration capacity determination unit is used to determine the configuration capacity of the transfer frequency converter configured at the sending end based on the overall transmission capacity of the target sending end power grid when no transfer frequency converter is configured at the sending end and the maximum overall transmission capacity that the target sending end power grid can achieve when a transfer frequency converter is configured at the sending end.

7. The system according to claim 6, characterized in that, The transient stability limit determination unit performs simulation calculations to obtain the transient stability limits of the power frequency transmission channel and the low frequency transmission channel, respectively, including: Perform a three-terminal N-1 fault simulation on any AC line in the power frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the power frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the power frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the power frequency transmission channel. Perform a three-terminal N-1 fault simulation on any AC line in the low-frequency transmission channel. If the system can operate stably after the fault, continue to increase the power flow of the low-frequency transmission channel. If the system cannot operate stably after the fault, roll back the power flow of the low-frequency transmission channel to the value before the increase, and determine this value as the transient stability limit of the low-frequency transmission channel.

8. The system according to claim 6, characterized in that, The power transmission capacity determination unit, based on the power frequency parameters, low frequency parameters, transient stability limits of the power frequency transmission channel, and transient stability limits of the low frequency transmission channel, determines the overall power transmission capacity of the target power grid without a transfer inverter at the sending end, and the maximum overall power transmission capacity achievable by the target power grid with a transfer inverter at the sending end. include: Based on HS PF =C PF *(N PF -1) Calculate the thermal stability limit HS of the power frequency transmission channel PF And based on TC PF =min{HS PF ,TS PF Calculate the power frequency transmission capacity (TC) of the external transmission channel. PF ; Based on HS LF =C LF *(N LF -1) Calculate the thermal stability limit HS of the low-frequency transmission channel LF And based on TC LF =min{HS LF ,TS LF Calculate the transmission capacity (TC) of the low-frequency power transmission channel. LF ; Based on TC A =TC PF +TC LF Calculate the overall power transmission capacity (TC) of the target power grid when the sending end is not equipped with a frequency converter. A ; Based on TC AP =TC PF +C LF *N LF Calculate the maximum overall transmission capacity (TC) of the power frequency transmission line after a triple N-1 fault occurs. AP ; Based on TC AL =TC LF +C PF *N PF Calculate the overall transmission capacity (TC) of the low-frequency transmission line after a triple N-1 fault. AL ; Based on TC AM =min{TC AP ,TC AL Calculate the maximum overall power transmission capacity (TC) that the target sending-end power grid can achieve. AM ; Where, N PF C represents the number of AC lines for power frequency transmission channels. PF The maximum capacity of each AC line; TS PF The transient stability limit of the power frequency transmission channel; TS LF N represents the transient stability limit of the low-frequency transmission channel. LF For the number of AC lines in the low-frequency transmission channel, C LF This is the maximum capacity of each AC line.

9. The system according to claim 6, characterized in that, The configuration capacity determination unit determines the configuration capacity of the transfer frequency converter at the sending end based on the overall transmission capacity of the target sending-end power grid without a transfer frequency converter and the maximum overall transmission capacity that the target sending-end power grid can achieve with a transfer frequency converter. include: W TS =(TC AM -TC A ) / 2, Among them, C TS Configure capacity for the transfer frequency converter; TC A This refers to the overall power transmission capacity of the target power grid when no frequency converter is configured at the sending end; TC AM The maximum overall power transmission capacity that the target power grid can achieve when a frequency converter is configured at the sending end.

10. The system according to claim 6, characterized in that, The system also includes: Inverter capacity calculation unit, used for C AR =(TC AM -TC PF )-C TR Calculate the required additional inverter capacity C at the receiving end of the low-frequency transmission channel. AR ; Channel power flow calculation unit, used for F P =TC PF +C TS and F L =TC LF +C TS Calculate the target sending-end power grid's maximum overall power transmission capacity (TC) under the condition that the sending end is equipped with a frequency converter. AM Time-frequency external transmission channel flow F P and low-frequency transmission channel trend F L ; Among them, TC AM The overall power transmission capacity of the target power grid under the condition of configuring a transfer frequency converter at the sending end; TC PF For power frequency transmission channel power transmission capacity; C TR For the low-frequency transmission channel receiving-end inverter capacity; TC LF For low-frequency power transmission channel capacity; C TS Configure capacity for the frequency converter.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1-5.

12. An electronic device, characterized in that, include: The computer-readable storage medium as described in claim 11; as well as One or more processors for executing a program in the computer-readable storage medium.

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