A system and method for calculating the operating boundary of a direct current receiving end system

Abstract

The application discloses a kind of direct current receiving end system operating boundary calculation system and method, system includes: real-time simulation workstation, real-time digital simulator, direct current background operation workstation and simulation interface board card;Real-time simulation workstation is configured to the corresponding AC-DC system simulation model and AC fault set of direct current receiving end system;Real-time digital simulator is used to load AC fault in AC fault set to AC-DC system simulation model, and calculate the power parameter of AC-DC system simulation model under AC fault;Simulation interface board card is used to send power parameter to direct current background operation workstation;Direct current background operation workstation is used to determine the operating boundary result of direct current receiving end system under AC fault based on power parameter.Solve the technical problem that the existing direct current receiving end system operating boundary calculation is low in reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of direct current transmission, in particular to a system and method for calculating the operation boundary of a direct current receiving end system. BACKGROUND

[0002] With the development of power transmission technology, compared with the traditional alternating current transmission technology, the direct current transmission technology has the advantages of large transmission capacity, low loss and rapidness, so it is widely used in long-distance large-capacity power transmission projects. The direct current receiving end system is a subsystem of the direct current transmission system, and its safe and stable operation affects the reliability of the direct current transmission system, so it is of great significance to analyze the direct current receiving end system.

[0003] The existing calculation method of the operation boundary of the direct current receiving end system is mostly based on electromechanical transient simulation or electromagnetic transient simulation software for analysis, but there is a big difference between the actual direct current operation control characteristics and the characteristics of the direct current software model in the electromechanical and electromagnetic transient state, which cannot accurately simulate and calculate the direct current operation control characteristics and subsequent recovery control measures, resulting in low reliability of the calculation result of the operation boundary.

[0004] Therefore, it is a technical problem to be solved by those skilled in the art to provide a more reliable calculation method of the operation boundary of the direct current receiving end system. SUMMARY

[0005] Therefore, the present application provides a system and method for calculating the operation boundary of a direct current receiving end system, which solves the technical problem of low reliability of the calculation of the operation boundary of the existing direct current receiving end system.

[0006] The first aspect of the present application provides a system for calculating the operation boundary of a direct current receiving end system, comprising:

[0007] a real-time simulation workstation, a real-time digital simulator, a direct current background operation workstation and a simulation interface board card;

[0008] The real-time simulation workstation is configured to configure an AC / DC system simulation model corresponding to the direct current receiving end system and an AC fault set.

[0009] The real-time digital simulator is configured to load an AC fault in the AC fault set into the AC / DC system simulation model and calculate power parameters of the AC / DC system simulation model under the AC fault.

[0010] The simulation interface board card is configured to send the power parameters to the direct current background operation workstation.

[0011] The direct current background operation workstation is configured to determine the operation boundary result of the direct current receiving end system under the AC fault based on the power parameters.

[0012] Optionally, the AC faults in the AC fault set are loaded into the AC-DC system simulation model, and power parameters of the AC-DC system simulation model under the AC faults are calculated, specifically including:

[0013] A corresponding relationship between each AC fault in the AC fault set and an AC line in the AC-DC system simulation model is obtained.

[0014] Based on the corresponding relationship, each AC fault is loaded into the corresponding AC line, and the power parameters of the AC-DC system simulation model under the AC fault are calculated.

[0015] Optionally, the corresponding relationship includes a first corresponding relationship between the first AC fault and the first AC line and a second corresponding relationship between the second AC fault and the second AC line.

[0016] Based on the corresponding relationship, each AC fault is loaded into the corresponding AC line, and the power parameters of the AC-DC system simulation model under the AC fault are calculated, specifically including:

[0017] Based on the first corresponding relationship, the first AC fault is loaded into the first AC line, and the power parameters of the AC-DC system simulation model under the first AC fault are calculated.

[0018] When the first AC fault is cleared, based on the second corresponding relationship, the second AC fault is loaded into the second AC line, and the power parameters of the AC-DC system simulation model under the second AC fault are calculated.

[0019] Optionally, based on the power parameters, a running boundary result of the DC receiving end system under the AC fault is determined, specifically including:

[0020] Using the power parameters, it is determined whether the transient voltage of the AC-DC system simulation model is stable.

[0021] If the transient voltage is stable, the model parameters of the AC-DC system simulation model when the transient voltage is stable are taken as the running boundary result of the DC receiving end system under the AC fault.

[0022] If the transient voltage is not stable, the model parameters of the AC-DC system simulation model are adjusted until the transient voltage is stable, and the model parameters of the AC-DC system simulation model when the transient voltage is stable are taken as the running boundary result of the DC receiving end system under the AC fault.

[0023] Optionally, the model parameters include generator output and / or DC operating power.

[0024] Optionally, the computing system further comprises: a DC control protection device;

[0025] The DC control protection device is arranged between the simulation interface board card and the DC background operation workstation.

[0026] The DC control protection device is configured to trigger a DC stability control function to reduce DC power of the AC-DC system simulation model when the AC fault is loaded into the AC-DC system simulation model.

[0027] Optionally, the model parameters further comprise: a reduction parameter of the AC-DC system simulation model when reducing the DC power.

[0028] The second aspect of the present application provides a method for calculating a DC receiving end system operation boundary, applied to the DC receiving end system operation boundary calculation system of any one of the first aspect, and the method comprises:

[0029] The real-time simulation workstation configures an AC-DC system simulation model corresponding to a DC receiving end system and an AC fault set;

[0030] The real-time digital simulator loads an AC fault in the AC fault set into the AC-DC system simulation model and calculates power parameters of the AC-DC system simulation model under the AC fault;

[0031] The simulation interface board card sends the power parameters to the DC background operation workstation;

[0032] The DC background operation workstation determines an operation boundary result of the DC receiving end system under the AC fault based on the power parameters.

[0033] Optionally, loading an AC fault in the AC fault set into the AC-DC system simulation model and calculating power parameters of the AC-DC system simulation model under the AC fault specifically comprises:

[0034] Obtaining a correspondence between each AC fault in the AC fault set and an AC line in the AC-DC system simulation model;

[0035] Based on the correspondence, each AC fault is loaded into the corresponding AC line, and the power parameters of the AC-DC system simulation model under the AC fault are calculated.

[0036] Optionally, determining an operation boundary result of the DC receiving end system under the AC fault based on the power parameters specifically comprises:

[0037] Using the power parameters to determine whether the transient voltage of the AC-DC system simulation model is stable;

[0038] if the transient voltage is stable, taking the model parameters of the AC / DC system simulation model when the transient voltage is stable as the operation boundary result of the DC receiving end system under the AC fault;

[0039] if the transient voltage is unstable, adjusting the model parameters of the AC / DC system simulation model until the transient voltage is stable, and taking the model parameters of the AC / DC system simulation model when the transient voltage is stable as the operation boundary result of the DC receiving end system under the AC fault.

[0040] From the above technical solutions, the present application has the following advantages:

[0041] The present application provides a DC receiving end system operation boundary calculation system, which comprises a real-time simulation workstation, a real-time digital simulator, a DC background operation workstation and a simulation interface board card; the real-time simulation workstation is configured to configure an AC / DC system simulation model corresponding to the DC receiving end system and an AC fault set; the real-time digital simulator is configured to load an AC fault in the AC fault set into the AC / DC system simulation model and calculate power parameters of the AC / DC system simulation model under the AC fault; the simulation interface board card is configured to send the power parameters to the DC background operation workstation; and the DC background operation workstation is configured to determine an operation boundary result of the DC receiving end system under the AC fault based on the power parameters.

[0042] In the present application, an AC / DC system simulation model corresponding to the DC receiving end system is specially built, and then a fault is loaded in the AC / DC system simulation model to calculate an operation boundary result of the AC / DC system simulation model under the fault. Since the AC / DC system simulation model can accurately simulate the DC operation control characteristics of the DC receiving end system, the operation boundary calculation based thereon is relatively accurate and has high reliability, thereby solving the technical problem of low calculation reliability of the operation boundary of the existing DC receiving end system. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0044] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of a DC receiving end system operation boundary calculation system in the present application;

[0045] Figure 2 FIG. 2 is a workflow diagram of a DC receiving end system operation boundary calculation system in the present application;

[0046] Figure 3 A flowchart of an embodiment of a method for calculating an operating boundary of a DC receiving end system in the present application. DETAILED DESCRIPTION

[0047] The embodiments of the present application provide a calculation system and method for an operating boundary of a DC receiving end system, and solve the technical problem of low calculation reliability of the operating boundary of the existing DC receiving end system.

[0048] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0049] The first aspect of the embodiments of the present application provides an embodiment of a calculation system for an operating boundary of a DC receiving end system.

[0050] Please refer to Figure 1 , Figure 1 A structural diagram of an embodiment of a calculation system for an operating boundary of a DC receiving end system in the present application.

[0051] The calculation system for the operating boundary of the DC receiving end system in the present embodiment comprises a real-time simulation workstation, a real-time digital simulator, a DC background operation workstation and a simulation interface board card; the real-time simulation workstation is configured to configure an AC / DC system simulation model and an AC fault set corresponding to the DC receiving end system; the real-time digital simulator is configured to load an AC fault in the AC fault set into the AC / DC system simulation model and calculate power parameters of the AC / DC system simulation model under the AC fault; the simulation interface board card is configured to send the power parameters to the DC background operation workstation; and the DC background operation workstation is configured to determine an operating boundary result of the DC receiving end system under the AC fault based on the power parameters.

[0052] The real-time simulation workstation in the present embodiment is a computer installed with real-time simulation software, through which a simulation model can be built in real time, and through which the real-time simulation workstation is connected with the real-time digital simulator, the AC / DC system simulation model is run on the real-time digital simulator, and the running data is transmitted in real time to the real-time simulation workstation through a network cable, which can be detected by an experimenter through software. That is, the AC / DC system simulation model is simulated through the real-time simulation workstation and the real-time digital simulator, and various operating conditions and fault conditions of the AC / DC system simulation model are simulated through the real-time digital simulator.

[0053] The direct current background operation workstation can operate the direct current switch and the knife gap in the field, start the direct current, and set the power of the direct current computer.

[0054] It can be understood that the AC-DC system simulation model and the DC receiving end system are the circuit structure of the DC power transmission equipment and the AC system network connected with the primary equipment of the DC power transmission system, that is, the AC-DC system simulation model is the network model of the DC power transmission equipment and the AC system network connected with the primary equipment of the DC power transmission system.

[0055] The specific AC-DC system simulation model configuration process is that in the software interactive interface of the real-time simulation workstation, the line parameters, generator parameters, load parameters and DC parameters and other information in the simulation data are built according to the format of the real-time digital simulator, and after the building is completed, the built model is tested, when the output of each generator in the AC-DC system simulation model, the active power transmitted by the line, the node voltage of each power element and the frequency of the system are consistent with the power system mode operation data, the voltage error is not more than 0.5%, and the frequency error is not more than 0.1%, the model runs normally, and the test is completed.

[0056] It can be understood that the power parameters in the embodiment include but are not limited to voltage and / or current.

[0057] It should be noted that the calculation system of the operating boundary in the embodiment can be applied to a weak system of the DC receiving end, and the weak system refers to a system with an SCR less than 3.

[0058] The SCR (Short Circuit Ratio) is an index for evaluating the strength of the AC system of the DC sending and receiving end, and the calculation formula is as follows:

[0059]

[0060] In the formula, S is the three-phase short-circuit capacity of the AC system when the converter bus voltage is rated, P dN is the rated power of the LCC-HVDC system, U N is the rated voltage of the converter bus, and Z is the equivalent impedance of the AC system.

[0061] The strength of the AC system divided by the short-circuit ratio is shown in the following formula:

[0062]

[0063] The SCR greater than 5 is a strong AC system, the SCR between 3 and 5 is a medium-strength system, and the SCR less than 3 is a weak AC system

[43] .

[0064] In the embodiment, a corresponding AC-DC system simulation model of the DC receiving end system is specially built, then a fault is loaded in the AC-DC system simulation model to calculate the operation boundary result of the AC-DC system simulation model under the fault. Since the AC-DC system simulation model can accurately simulate the DC operation control characteristics of the DC receiving end system, the operation boundary calculation based thereon is relatively accurate and has high reliability, thereby solving the technical problem of low reliability of the existing DC receiving end system operation boundary calculation.

[0065] The following is an embodiment two of the DC receiving end system operation boundary calculation system provided by the embodiment of the application.

[0066] Please refer to Figure 1 , Figure 1 The following is a structure schematic diagram of the embodiment of the DC receiving end system operation boundary calculation system in the embodiment of the application.

[0067] The DC receiving end system operation boundary calculation system in the embodiment includes: a real-time simulation workstation, a real-time digital simulator, a DC background operation workstation and a simulation interface board card; the real-time simulation workstation is configured to configure an AC-DC system simulation model corresponding to the DC receiving end system and an AC fault set; the real-time digital simulator is configured to load an AC fault in the AC fault set into the AC-DC system simulation model and calculate power parameters of the AC-DC system simulation model under the AC fault; the simulation interface board card is configured to send the power parameters to the DC background operation workstation; and the DC background operation workstation is configured to determine an operation boundary result of the DC receiving end system under the AC fault based on the power parameters.

[0068] Specifically, the AC fault in the AC fault set is loaded into the AC-DC system simulation model, and the power parameters of the AC-DC system simulation model under the AC fault are calculated, which specifically includes:

[0069] The corresponding relationship between each AC fault in the AC fault set and the AC line in the AC-DC system simulation model is obtained;

[0070] Based on the corresponding relationship, each AC fault is loaded into the corresponding AC line, and the power parameters of the AC-DC system simulation model under the AC fault are calculated.

[0071] It can be understood that there is generally only one kind of AC fault for an AC line. In the embodiment, the most common fault of each AC line is configured as the AC fault for testing.

[0072] The corresponding relationship in the embodiment can include a first corresponding relationship between a first AC fault and a first AC line and a second corresponding relationship between a second AC fault and a second AC line.

[0073] Based on the correspondence, each AC fault is loaded to the corresponding AC line, and the power parameters of the AC-DC system simulation model under the AC fault are calculated, specifically including:

[0074] Based on the first correspondence, the first AC fault is loaded to the first AC line, and the power parameters of the AC-DC system simulation model under the first AC fault are calculated;

[0075] When the first AC fault is cleared, based on the second correspondence, the second AC fault is loaded to the second AC line, and the power parameters of the AC-DC system simulation model under the second AC fault are calculated.

[0076] Optionally, in an embodiment, based on the power parameters, the operating boundary result of the DC receiving end system under the AC fault is determined, specifically including:

[0077] Using the power parameters, it is judged whether the transient voltage of the AC-DC system simulation model is stable;

[0078] If the transient voltage is stable, the model parameters of the AC-DC system simulation model when the transient voltage is stable are taken as the operating boundary result of the DC receiving end system under the AC fault;

[0079] If the transient voltage is not stable, the model parameters of the AC-DC system simulation model are adjusted until the transient voltage is stable, and the model parameters of the AC-DC system simulation model when the transient voltage is stable are taken as the operating boundary result of the DC receiving end system under the AC fault.

[0080] The transient voltage stability in the embodiment refers to the size relationship (for example, greater than, less than or equal to) between the voltage and the voltage threshold, which remains unchanged within a preset time length.

[0081] It can be understood that the model parameters include: generator output and / or DC operating power.

[0082] Further, the computing system in the embodiment further includes: a DC control protection device;

[0083] The DC control protection device is arranged between the simulation interface board card and the DC background operation workstation;

[0084] The DC control protection device is used to trigger the DC stability control function when the AC fault is loaded to the AC-DC system simulation model, so as to reduce the DC power of the AC-DC system simulation model.

[0085] Further, the DC control protection device in the embodiment is also used to transmit the control signal of the converter valve control system issued by the DC background operation workstation to the converter valve model in the real-time digital simulator after being processed by the converter valve control system, so as to realize real-time converter valve triggering.

[0086] Specifically, the model parameters further include: a drop parameter of the AC-DC system simulation model when the DC power is dropped.

[0087] Further, the computing system in the embodiment further includes: a simulation interface device, configured to transmit the power parameters sent by the real-time digital simulator after data processing and protocol conversion to the DC control and protection device.

[0088] As shown in Figure 1 the simulation interface board card in the embodiment includes a GTA0 board card (an analog quantity communication board card), a GTDI board card (a digital quantity communication board card), and a GTDO board card (a digital quantity communication board card). Specifically, the GTDO board card is connected with the real-time digital simulator through an optical fiber; the GTDO board card is connected with the DC control and protection device through hard wiring. The GTA0 board card and the GTDI board card are connected with the real-time digital simulator through an optical fiber, and the GTA0 board card and the GTDI board card are connected with the simulation interface device through an optical fiber. The simulation interface device is connected with the DC control and protection device through an optical fiber, and the DC control and protection device is connected with the DC background operation workstation through a network cable.

[0089] For ease of understanding, please refer to Figure 2 the working process of the computing system for the operation boundary of the DC receiving end system in the embodiment is explained as follows:

[0090] (1) Based on the power system operation data provided by the power grid dispatching and operation mechanism, an AC-DC system simulation model is built on the real-time simulation workstation, and the AC-DC system simulation model is started after being built.

[0091] (2) In the DC background operation workstation, the actual DC field is configured (for example, the switches and knife switches of the DC field are simulated to be operated), and the DC field is controlled to run to a simulation operation power. The generator is adjusted to a test initial state in the AC-DC system simulation model operation interface.

[0092] (3) The AC line fault test is performed according to the AC faults in the AC fault set, and the voltage of each AC bus of the AC-DC system simulation model is monitored to evaluate whether the transient voltage of the AC-DC system simulation model is stable (for example, whether the voltage of the AC line where the AC fault occurs is stable), if not, the generator output (reduced or increased), the DC operation power (reduced), or the DC power level after the fault (reduced) is adjusted, after the AC fault is cleared, the AC-DC system simulation model is restarted to perform repeated tests, and step 3 is repeated until the transient voltage of the AC-DC system simulation model after the fault is stable.

[0093] (4) After the AC fault is cleared, the next AC fault test of the AC fault set is performed by restarting the system operation, and the test method is as in step 3.

[0094] In this embodiment, the DC power transmission equipment and the AC system network connected with the primary equipment of the DC power transmission system are simulated by the real-time simulation workstation and the real-time digital simulator, a corresponding AC / DC system simulation model is built, various operating conditions and fault conditions of the AC / DC system simulation model are simulated by the real-time digital simulator, the DC control protection function of the DC control protection device can be triggered by the fault of the AC / DC simulation model, the DC power is reduced, the trigger signal is output through the simulation interface board card, and the simulation interface board card is connected to the DC control protection device. The entire DC control protection test closed loop based on the real-time digital simulator is adjusted through the operating conditions of the AC / DC system and the set faults at different positions, the accurate simulation of the AC and DC primary systems under normal and fault conditions is realized in the closed loop of the entire test system, the operating boundary of the DC receiving end system is effectively tested, and reliable technical support is provided for engineering production.

[0095] The above is the second embodiment of the DC receiving end system operating boundary calculation system provided by the embodiment of the application, and the following is an embodiment of a DC receiving end system operating boundary calculation method provided by the embodiment of the application.

[0096] Please refer to Figure 3 , Figure 3 The flowchart of the embodiment of the DC receiving end system operating boundary calculation method in the embodiment of the application is shown.

[0097] The DC receiving end system operating boundary calculation method in this embodiment is applied to the DC receiving end system operating boundary calculation system in the foregoing embodiment, and the calculation method comprises the following steps.

[0098] Step 301, the real-time simulation workstation configures the AC / DC system simulation model corresponding to the DC receiving end system and an AC fault set;

[0099] Step 302, the real-time digital simulator loads the AC faults in the AC fault set into the AC / DC system simulation model and calculates the power parameters of the AC / DC system simulation model under the AC faults;

[0100] Step 303, the simulation interface board card sends the power parameters to the DC background operation workstation;

[0101] Step 304, the DC background operation workstation determines the operating boundary result of the DC receiving end system under the AC faults based on the power parameters.

[0102] Specifically, the AC faults in the AC fault set are loaded into the AC / DC system simulation model, and the power parameters of the AC / DC system simulation model under the AC faults are calculated, which specifically comprises the following steps.

[0103] obtaining a corresponding relationship between each AC fault in the AC fault set and an AC line in the AC-DC system simulation model;

[0104] based on the corresponding relationship, loading each AC fault to the corresponding AC line respectively, and calculating the power parameters of the AC-DC system simulation model under the AC fault.

[0105] The corresponding relationship in the embodiment can include a first corresponding relationship between the first AC fault and the first AC line and a second corresponding relationship between the second AC fault and the second AC line.

[0106] based on the corresponding relationship, loading each AC fault to the corresponding AC line respectively, and calculating the power parameters of the AC-DC system simulation model under the AC fault.

[0107] based on the first corresponding relationship, loading the first AC fault to the first AC line, and calculating the power parameters of the AC-DC system simulation model under the first AC fault.

[0108] When the first AC fault is cleared, based on the second corresponding relationship, loading the second AC fault to the second AC line, and calculating the power parameters of the AC-DC system simulation model under the second AC fault.

[0109] Optionally, based on the power parameters, determining the operation boundary result of the DC receiving end system under the AC fault, specifically including:

[0110] using the power parameters to determine whether the transient voltage of the AC-DC system simulation model is stable;

[0111] If the transient voltage is stable, the model parameters of the AC-DC system simulation model when the transient voltage is stable are taken as the operation boundary result of the DC receiving end system under the AC fault.

[0112] If the transient voltage is not stable, the model parameters of the AC-DC system simulation model are adjusted until the transient voltage is stable, and the model parameters of the AC-DC system simulation model when the transient voltage is stable are taken as the operation boundary result of the DC receiving end system under the AC fault.

[0113] It can be understood that the model parameters include generator output and / or DC operating power.

[0114] Further, the calculation method in the embodiment further includes:

[0115] When the AC fault is loaded to the AC-DC system simulation model, the DC control and protection device triggers the DC stability control function to reduce the DC power of the AC-DC system simulation model.

[0116] Specifically, the model parameters further include a reduction parameter when the AC-DC system simulation model reduces the DC power.

[0117] In this embodiment, a real-time simulation workstation and a real-time digital simulator are used to simulate DC transmission equipment and the AC system network connected to the primary equipment of the DC transmission system, building a corresponding AC / DC system simulation model. Simultaneously, the real-time digital simulator simulates various operating conditions and fault scenarios of this AC / DC system simulation model. Faults in the AC / DC simulation model can trigger the DC stabilization function of the DC control and protection device, reducing DC power. The trigger signal is output through the simulation interface board, which is connected to the DC control and protection device. The entire DC control and protection test closed loop based on the real-time digital simulator, through adjustments to the operating conditions of the AC / DC system and the setting of faults at different locations, detects the AC / DC system within the closed loop of the entire test system. This achieves accurate simulation of the AC and DC primary systems under normal and fault conditions, effectively testing the operating boundaries of the DC receiving-end system and providing reliable technical support for engineering production.

[0118] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific implementation process of the method described above can be referred to the corresponding process in the aforementioned system embodiments, and will not be repeated here.

[0119] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another power grid network to be installed, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0120] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0121] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0122] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a computer-readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned computer-readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0123] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A calculation system for the operating boundary of a DC receiving-end system, characterized in that, include: Real-time simulation workstation, real-time digital simulator, DC back-end operation workstation and simulation interface board; The real-time simulation workstation is used to configure the AC / DC system simulation model and AC fault set corresponding to the DC receiving-end system; The real-time digital simulator is used to load the AC faults in the AC fault set into the AC / DC system simulation model and calculate the power parameters of the AC / DC system simulation model under the AC faults. The simulation interface board is used to send the power parameters to the DC back-end operation workstation; The DC back-end operation workstation is used to determine the operating boundary results of the DC receiving-end system under the AC fault based on the power parameters. Based on the aforementioned power parameters, the operational boundary results of the DC receiving-end system under the AC fault are determined, specifically including: Using the aforementioned power parameters, determine whether the transient voltage of the AC / DC system simulation model is stable; If the transient voltage stabilizes, the model parameters of the AC / DC system simulation model when the transient voltage stabilizes are used as the operating boundary results of the DC receiving-end system under the AC fault. If the transient voltage is unstable, the model parameters of the AC / DC system simulation model are adjusted until the transient voltage stabilizes, and the model parameters of the AC / DC system simulation model when the transient voltage stabilizes are used as the operating boundary results of the DC receiving-end system under the AC fault.

2. The calculation system for the operating boundary of a DC receiving-end system according to claim 1, characterized in that, The AC faults in the AC fault set are loaded into the AC / DC system simulation model, and the power parameters of the AC / DC system simulation model under the AC faults are calculated, specifically including: Obtain the correspondence between each AC fault in the AC fault set and the AC line in the AC / DC system simulation model; Based on the correspondence, each AC fault is loaded onto the corresponding AC line, and the power parameters of the AC / DC system simulation model under the AC fault are calculated.

3. The calculation system for the operating boundary of a DC receiving-end system according to claim 2, characterized in that, The correspondence includes: a first correspondence between the first AC fault and the first AC line, and a second correspondence between the second AC fault and the second AC line; Based on the aforementioned correspondence, each AC fault is applied to its corresponding AC line, and the power parameters of the AC / DC system simulation model under the AC fault are calculated, specifically including: Based on the first correspondence, the first AC fault is loaded onto the first AC line, and the power parameters of the AC / DC system simulation model under the first AC fault are calculated. After the first AC fault is cleared, based on the second correspondence, the second AC fault is loaded onto the second AC line, and the power parameters of the AC / DC system simulation model under the second AC fault are calculated.

4. The calculation system for the operating boundary of a DC receiving-end system according to any one of claims 1 to 3, characterized in that, The model parameters include: generator output and / or DC operating power.

5. The calculation system for the operating boundary of a DC receiving-end system according to claim 4, characterized in that, The computing system also includes: a DC control and protection device; The DC control and protection device is located between the simulation interface board and the DC back-end operation workstation; The DC control and protection device is used to trigger the DC stabilization function when the AC fault is applied to the AC / DC system simulation model, so as to reduce the DC power of the AC / DC system simulation model.

6. The calculation system for the operating boundary of a DC receiving-end system according to claim 5, characterized in that, The model parameters also include: the reduction parameters when the DC power is reduced in the AC / DC system simulation model.

7. A method for calculating the operating boundary of a DC receiving-end system, characterized in that, The calculation method for the calculation system applied to the operating boundary of the DC receiving-end system as described in any one of claims 1 to 6 includes: The real-time simulation workstation is configured with the AC / DC system simulation model and AC fault set corresponding to the DC receiving-end system; The real-time digital simulator loads the AC faults from the AC fault set into the AC / DC system simulation model and calculates the power parameters of the AC / DC system simulation model under the AC faults. The simulation interface board sends the power parameters to the DC back-end operation workstation; Based on the power parameters, the DC back-end operation workstation determines the operating boundary results of the DC receiving-end system under the AC fault. Based on the aforementioned power parameters, the operational boundary results of the DC receiving-end system under the AC fault are determined, specifically including: Using the aforementioned power parameters, determine whether the transient voltage of the AC / DC system simulation model is stable; If the transient voltage stabilizes, the model parameters of the AC / DC system simulation model when the transient voltage stabilizes are used as the operating boundary results of the DC receiving-end system under the AC fault. If the transient voltage is unstable, the model parameters of the AC / DC system simulation model are adjusted until the transient voltage stabilizes, and the model parameters of the AC / DC system simulation model when the transient voltage stabilizes are used as the operating boundary results of the DC receiving-end system under the AC fault.

8. The method for calculating the operating boundary of a DC receiving-end system according to claim 7, characterized in that, The AC faults in the AC fault set are loaded into the AC / DC system simulation model, and the power parameters of the AC / DC system simulation model under the AC faults are calculated, specifically including: Obtain the correspondence between each AC fault in the AC fault set and the AC line in the AC / DC system simulation model; Based on the correspondence, each AC fault is loaded onto the corresponding AC line, and the power parameters of the AC / DC system simulation model under the AC fault are calculated.

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