A protection setting method and system for large-scale high-voltage generator-transformer group

Abstract

The present application relates to a protection setting method and system applied to a large-scale high-voltage generator-transformer group, the method comprising calculating the section limit of a first position and the section limit of a second position; simulating the fault condition of the first position and determining the load transfer condition according to the fault condition of the first position; determining the maximum load transfer amount according to the section limit of the second position; calculating the load excess amount according to the maximum load transfer amount; drawing a load excess amount curve based on the calculated load excess amount; analyzing the load excess amount curve to obtain an acceptance area and a non-acceptance area; calculating whether the non-acceptance area of ​​the load excess amount curve is within the tolerance range of the protection device. The protection setting method and system applied to a large-scale high-voltage generator-transformer group disclosed in the present application performs setting calculations on the large-scale high-voltage generator-transformer group by dynamically calculating the operating parameters of the power grid, thereby ensuring the safe and stable operation of the power grid.

Description

Technical Field

[0001] The present application relates to the field of smart grid technology, and in particular to a protection setting method and system for large-scale high-voltage generator-transformer groups. Background Art

[0002] UHV usually refers to AC transmission systems with voltage levels of 1000 kV and above and DC systems with voltage levels of ±800 kV and above. UHV AC systems are mainly used for short-distance large-capacity transmission and grid construction of a higher voltage level; UHV DC is mainly used for long-distance large-capacity transmission with clear transmission and reception relationships, as well as interconnection between some large regional and provincial networks.

[0003] Setting means that before the electrical equipment is put into normal operation, the normal operating current of the equipment must be tested to see if it is within the setting current range of the upper protection switch. Because there is an objective deviation between the theoretical value of the electrical design and the operating value of the equipment, if the deviation is too large and exceeds the setting value, it will trigger the action of the relay protection device, thereby protecting the safety of personnel and equipment.

[0004] For setting, one method is to perform calculations based on existing electrical parameters. The limitation of this method is that it can only perform calculations within a certain range. When the structure of the power grid changes or the operating mode changes, recalculation is required.

[0005] Taking the electromagnetic ring network (two groups of lines with different voltage levels running in parallel through the connection of the magnetic circuits of transformers at both ends) as an example, during the continuous construction of the high-voltage power grid, the structure and operation mode of the power grid will change. There is an urgent need for a processing method that can simulate such changes and perform dynamic calculations to monitor the power grid and ensure its safe operation. Summary of the invention

[0006] The present application provides a protection setting method and system applied to a large-scale high-voltage generator-transformer group, which performs setting calculations on the large-scale high-voltage generator-transformer group by dynamically calculating the operating parameters of the power grid, thereby ensuring the safe and stable operation of the power grid.

[0007] The above-mentioned purpose of the present application is achieved through the following technical solutions:

[0008] In a first aspect, the present application provides a protection setting method applied to a large-scale high-voltage generator-transformer group, comprising:

[0009] Calculate the cross-sectional limit at the first position and the cross-sectional limit at the second position;

[0010] simulating a fault condition at a first location and determining a load transfer condition based on the fault condition at the first location;

[0011] Determine the maximum load transfer amount according to the section limit at the second position;

[0012] Calculate the load excess based on the maximum load transfer;

[0013] Draw a load excess curve based on the calculated load excess;

[0014] Analyze the load excess curve to obtain the acceptance area and non-acceptance area;

[0015] Calculate whether the non-acceptance area of ​​the load excess curve is within the tolerance range of the protection device, and issue an alarm when the non-acceptance area of ​​the load excess curve is outside the tolerance range of the protection device;

[0016] Among them, the section limit at the first position and the section limit at the second position are both calculated dynamically.

[0017] In a possible implementation of the first aspect, the section limit includes a basic section limit and a limit section limit;

[0018] The calculation of basic section limit includes:

[0019] Calculating the difference between the current transmission current value and the rated transmission current value to obtain a first difference;

[0020] Calculate the basic section limit according to the first difference, where the basic section limit is the product of the first difference and the voltage;

[0021] The calculation of the ultimate section limit includes:

[0022] Obtaining a limiting current value according to a heat balance equation and calculating a difference between the limiting current value and a rated transmission current value to obtain a second difference value;

[0023] The limit section limit is calculated according to the second difference, and the limit section limit is the product of the second difference and the voltage.

[0024] In a possible implementation manner of the first aspect, simulating a fault condition at the first location and determining a load transfer condition according to the fault condition at the first location includes:

[0025] determining a number of fault conditions, the number of fault conditions being multiple;

[0026] Determine the load transfer amount corresponding to the fault, the load transfer amount includes the local load transfer amount and the external load transfer amount;

[0027] Calculate the reception of the out-of-town load transfer at the second location;

[0028] The local load transfer amount and the foreign load transfer amount are adjusted according to the reception status of the foreign load transfer amount at the second location.

[0029] In a possible implementation of the first aspect, when the amount of external load transfer exceeds the basic section limit of the second position, the section limit of the first position is increased by the extreme section limit.

[0030] In a possible implementation manner of the first aspect, the calculated load excess includes:

[0031] Dynamically calculating the cross-sectional limit at the first position and the cross-sectional limit at the second position in time;

[0032] adjusting the maximum load transfer amount based on the dynamically calculated result of the section limit at the first position and the section limit at the second position;

[0033] Calculate the load excess based on the maximum load transfer;

[0034] Among them, when the maximum load transfer amount is greater than the basic section limit of the second position, the extreme section limit of the first position is preferentially enabled.

[0035] In a possible implementation manner of the first aspect, the load excess curve is analyzed to obtain the acceptance area and the non-acceptance area, including:

[0036] The limit reference line is calculated using the sum of the basic section limit and the limit section limit of the first position and the sum of the basic section limit and the limit section limit of the second position;

[0037] The load excess curve is cut using the limit reference line. The portion of the load excess curve below the limit reference line is the acceptance area, and the portion of the load excess curve above the limit reference line is the non-acceptance area.

[0038] In a possible implementation manner of the first aspect, a non-acceptance region of the load excess curve is checked, and the checking includes:

[0039] Determine the acceptance region that is directly associated with the non-acceptance region. In the time series, the acceptance region that is directly associated is located in front of the non-acceptance region and is adjacent to the non-acceptance region.

[0040] Calculate the heat generated by the directly related receiving area;

[0041] Use the heat value to calibrate the tolerance range of the protection equipment and obtain the correction value;

[0042] The load excess curve is adjusted vertically using the correction amount to obtain a new non-acceptance region.

[0043] In a second aspect, the present application provides a protection setting device applied to a large-scale high-voltage generator-transformer group, comprising:

[0044] A first calculation unit, used for calculating the cross-sectional limit of the first position and the cross-sectional limit of the second position;

[0045] a simulation unit, used to simulate a fault condition at the first location and determine a load transfer condition according to the fault condition at the first location;

[0046] A second calculation unit, used to determine the maximum load transfer amount according to the section limit at the second position;

[0047] a third calculation unit, configured to calculate a load excess amount according to a maximum load transfer amount;

[0048] A curve drawing unit, used for drawing a load excess curve based on the calculated load excess;

[0049] A curve analysis unit, used for analyzing the load excess curve to obtain an acceptance area and a non-acceptance area;

[0050] A fourth calculation unit is used to calculate whether the non-acceptance area of ​​the load excess curve is within the bearing capacity of the protection device, and to issue an alarm when the non-acceptance area of ​​the load excess curve is outside the bearing capacity of the protection device;

[0051] Among them, the section limit at the first position and the section limit at the second position are both calculated dynamically.

[0052] In a third aspect, the present application provides a protection setting system for a large-scale high-voltage generator-transformer group, the system comprising:

[0053] one or more memories for storing instructions; and

[0054] One or more processors, used to call and run the instructions from the memory to execute the method as described in the first aspect and any possible implementation of the first aspect.

[0055] In a fourth aspect, the present application provides a computer-readable storage medium, the computer-readable storage medium comprising:

[0056] Program, when the program is executed by a processor, the method described in the first aspect and any possible implementation of the first aspect is executed.

[0057] In a fifth aspect, the present application provides a computer program product, comprising program instructions. When the program instructions are executed by a computing device, the method described in the first aspect and any possible implementation of the first aspect is executed.

[0058] In a sixth aspect, the present application provides a chip system, which includes a processor for implementing the functions involved in the above aspects, for example, generating, receiving, sending, or processing the data and / or information involved in the above methods.

[0059] The chip system may be composed of chips, or may include chips and other discrete devices.

[0060] In a possible design, the chip system also includes a memory, which is used to store necessary program instructions and data. The processor and the memory can be decoupled and respectively set on different devices, connected by wired or wireless means, or the processor and the memory can also be coupled on the same device. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic flowchart of the steps of a protection setting method provided in this application.

[0062] Figure 2 This is a schematic diagram of an electric energy transfer method provided by this application.

[0063] Figure 3 This is a principle schematic diagram for obtaining a limit reference line provided by the present application.

[0064] Figure 4 It is a schematic diagram of a load excess curve cut using a limit reference line provided in the present application. DETAILED DESCRIPTION

[0065] The technical solution in this application is further described in detail below in conjunction with the accompanying drawings.

[0066] This application discloses a protection setting method for large-scale high-voltage generator-transformer groups. Figure 1 In some examples, the protection setting method for a large-scale high-voltage generator-transformer group disclosed in the present application includes the following steps:

[0067] S101, simulating a fault condition at a first location and determining a load transfer condition according to the fault condition at the first location;

[0068] S102, determining a maximum load transfer amount according to the section limit of the second position;

[0069] S103, calculating the load excess amount according to the maximum load transfer amount;

[0070] S104, drawing a load excess curve based on the calculated load excess;

[0071] S105, analyzing the load excess curve to obtain an acceptance area and a non-acceptance area;

[0072] S106, calculating whether the non-acceptance area of ​​the load excess curve is within the tolerance range of the protection device, and issuing an alarm when the non-acceptance area of ​​the load excess curve is outside the tolerance range of the protection device;

[0073] Among them, the section limit at the first position and the section limit at the second position are both calculated dynamically.

[0074] In order to more clearly understand the technical solution in this application, the electromagnetic ring network is first introduced. The electromagnetic ring network is also called the high- and low-voltage electromagnetic ring network, which refers to two groups of lines with different voltage levels connected in parallel through the magnetic circuits of transformers at both ends. The electromagnetic ring network is like a "crutch". In the early stage of the higher-level power grid, since the higher-level power grid is relatively weak, the power grid can only rely on the higher-level power grid and the lower-level power grid to jointly transmit electricity to improve the power supply capacity. When the higher-level power grid fails, the power transfer will cause the lower-level power grid to overload, and it will also cause transient instability or even system oscillation.

[0075] The problem to be solved by this application is to calculate whether the protection capability of the protection equipment at the lower level power grid meets the requirements when a higher level power grid fails, and to issue an alarm when the protection capability range is exceeded. The calculation process is performed dynamically during the operation of the power grid, and whether the protection capability range is exceeded can be dynamically calculated.

[0076] In step S101 to step S106, the fault condition of the first position is first simulated and the load transfer condition is determined according to the fault condition of the first position. The fault condition here refers to a fault in the transmission line. The first position refers to a higher-level power grid, that is, the large-scale high-voltage generator-transformer group mentioned in this application. The lower-level power grid refers to a power grid whose transmission voltage is lower than that of the higher-level power grid.

[0077] There are multiple transmission lines in the higher-level power grid, and with the construction of the power grid, the number of transmission lines will further increase. When any transmission line fails, this transmission line no longer transmits electric energy. This situation is called a fault situation.

[0078] There are many fault conditions in the first position, generally one or two transmission lines fail, or a transmission line failure is predicted based on a conjectured limit condition. The reason why the present application limits the failure of a transmission line to one or two is to consider the stability of the power grid itself.

[0079] Then the maximum load transfer amount will be determined according to the section limit of the second position. At this time, the section limit of the second position is used to transport the electric energy transferred by the higher-level power grid, such as Figure 2 shown.

[0080] Then, the load excess is calculated according to the maximum load transfer amount and a load excess curve is drawn based on the calculated load excess. After the load excess curve is obtained, the load excess curve is analyzed to obtain an acceptance area and a non-acceptance area.

[0081] The acceptance area indicates that the lower level grid can deliver the electric energy transferred by the higher level grid, and the non-acceptance area indicates that the lower level grid cannot deliver the electric energy transferred by the higher level grid. When the non-acceptance area of ​​the load excess curve is outside the tolerance range of the protection device, an alarm is issued.

[0082] In the application, the section limit at the first position and the section limit at the second position are both calculated dynamically in order to cope with changes in the power grid, which include structural changes and changes in working conditions (flow).

[0083] The section limits in the above method include basic section limits and extreme section limits. The specific calculation method is as follows:

[0084] The calculation of basic section limit includes:

[0085] Calculating the difference between the current transmission current value and the rated transmission current value to obtain a first difference;

[0086] Calculate the basic section limit according to the first difference, where the basic section limit is the product of the first difference and the voltage;

[0087] The calculation of the ultimate section limit includes:

[0088] Obtaining a limiting current value according to a heat balance equation and calculating a difference between the limiting current value and a rated transmission current value to obtain a second difference value;

[0089] The limit section limit is calculated according to the second difference, and the limit section limit is the product of the second difference and the voltage.

[0090] Regarding the thermal balance equation, the current calculation methods include the cable thermal circuit model method, IEC method, thermal resistance correction method and shape factor method. The ultimate section limit refers to the calculation within the allowable range, based on the principle that the cable core temperature does not exceed its maximum allowable temperature.

[0091] The basic section limit corresponds to the electric energy of the transmission line under normal working conditions, and the extreme section limit corresponds to the additional electric energy that the transmission line can transmit under full load conditions.

[0092] In some examples, the specific steps of simulating a fault condition at a first location and determining a load transfer condition according to the fault condition at the first location are:

[0093] S201, determining the number of fault conditions, where the number of fault conditions is multiple;

[0094] S202, determining a load transfer amount corresponding to the fault, where the load transfer amount includes a local load transfer amount and a foreign load transfer amount;

[0095] S203, calculating the reception status of the out-of-town load transfer amount at the second location;

[0096] S204: Adjust the local load transfer amount and the external load transfer amount according to the reception status of the external load transfer amount at the second location.

[0097] In step S201 to step S204, the load transfer amount corresponding to the fault refers to the need to transfer the electric energy transmitted on the transmission line after the transmission line fails. The transfer is divided into two parts, namely the local load transfer amount and the foreign load transfer amount. Figure 2 shown.

[0098] Local load transfer refers to the load that can be transmitted through other lines of the higher-level power grid, and external load transfer refers to the load that needs to be transmitted through the lines of the lower-level power grid.

[0099] Then, the reception condition of the foreign load transfer amount at the second location is calculated and the local load transfer amount and the foreign load transfer amount are adjusted according to the reception condition.

[0100] The adjustment here means using only the basic section limit as much as possible, but when the amount of external load transfer exceeds the basic section limit of the second position, the section limit of the first position is increased by the extreme section limit.

[0101] In some examples, calculated load excesses include:

[0102] S301, dynamically calculating the section limit of the first position and the section limit of the second position in time;

[0103] S302, adjusting the maximum load transfer amount based on the dynamic calculation result of the section limit of the first position and the section limit of the second position;

[0104] S303, calculating the load excess amount according to the maximum load transfer amount;

[0105] Among them, when the maximum load transfer amount is greater than the basic section limit of the second position, the extreme section limit of the first position is preferentially enabled.

[0106] In step S301 to step S303, it is necessary to dynamically calculate the section limit of the first position and the section limit of the second position, then adjust the maximum load transfer amount, and finally calculate the load excess amount according to the maximum load transfer amount.

[0107] The load excess here refers to the difference between the maximum load transfer and the section limit.

[0108] In some examples, the load excess curve is analyzed to obtain the acceptance area and the non-acceptance area in the following manner:

[0109] S401, using the sum of the basic section limit and the limit section limit of the first position and the sum of the basic section limit and the limit section limit of the second position to calculate the limit reference line, Figure 3 As shown;

[0110] S402, Cutting Load Excess Curve Using Limit Reference Line, see Figure 4 The part of the load excess curve below the limit reference line is the acceptance area, and the part of the load excess curve above the limit reference line is the non-acceptance area.

[0111] For non-acceptable areas, calibration is required. The calibration method is as follows:

[0112] S501, determining an acceptance region that is directly associated with a non-acceptance region, wherein the acceptance region that is directly associated with the non-acceptance region is located in front of the non-acceptance region and is adjacent to the non-acceptance region in time series;

[0113] S502, calculating the heat generated by the receiving area having a direct correlation relationship;

[0114] S503, using the heat value to calibrate the tolerance range of the protection device to obtain a correction amount;

[0115] S504, using the correction amount to adjust the load excess curve in the vertical direction to obtain a new non-acceptance area.

[0116] In step S501 to step S504, the heat generated by the receiving area directly associated with the non-receiving area is first calculated. The specific calculation formula is as follows:

[0117] Heat generation = internal resistance of protection device * current * time * heat dissipation rate;

[0118] In the above formula, the internal resistance and heat dissipation rate of the protection device are fixed values, the current is the detection value, and the time is the cumulative value. The heat dissipation rate also needs to consider the ambient temperature of the protection device. For example, the heat dissipation rates in summer and winter will be significantly different because winter will bring a greater temperature difference.

[0119] The heat generation is related to the temperature of the protection device. The above method can be used to calculate the accumulated heat inside the protection device. The temperature of the protection device can be calculated through the accumulated heat. The specific calculation method is to obtain the heat required for the protection device to rise by one degree through experiments. The ratio of the accumulated heat to the heat is the basic temperature of the protection device. The actual temperature of the protection device is the sum of the basic temperature and the ambient temperature.

[0120] Using heat generation to correct the tolerance range of the protection device refers to inferring the ultimate tolerance range of the protection device through temperature. Because temperature is negatively correlated with the ultimate tolerance range of the protection device, it is also necessary to use experiments to obtain the relationship between temperature and the ultimate tolerance range of the protection device to obtain a corresponding table or curve.

[0121] For example, the temperature of the protection device is 20 degrees, and the ultimate bearing capacity of the protection device is 80 degrees. There is a 60-degree temperature rise space in between. However, when the temperature of the protection device is 60 degrees, there is only a 20-degree temperature rise space.

[0122] The correction amount obtained at this time is associated with the calorific value, and the calorific value caused by the non-accepting area needs to be subtracted from the calorific value obtained based on the correction amount. The specific calculation process is: the current change trend can be obtained through the non-accepting area, and then the calorific value caused by the non-accepting area can be obtained. The calorific value minus the calorific value obtained based on the correction amount is obtained to obtain a new calorific value, and then the area of ​​the non-accepting area is reversely calculated through this new calorific value, and a new non-accepting area is obtained at this time.

[0123] The present application also provides a protection setting device applied to a large-scale high-voltage generator-transformer group, comprising:

[0124] A first calculation unit, used for calculating the cross-sectional limit of the first position and the cross-sectional limit of the second position;

[0125] a simulation unit, used to simulate a fault condition at the first location and determine a load transfer condition according to the fault condition at the first location;

[0126] A second calculation unit, used to determine the maximum load transfer amount according to the section limit at the second position;

[0127] a third calculation unit, configured to calculate a load excess amount according to a maximum load transfer amount;

[0128] A curve drawing unit, used for drawing a load excess curve based on the calculated load excess;

[0129] A curve analysis unit, used for analyzing the load excess curve to obtain an acceptance area and a non-acceptance area;

[0130] A fourth calculation unit is used to calculate whether the non-acceptance area of ​​the load excess curve is within the bearing capacity of the protection device, and to issue an alarm when the non-acceptance area of ​​the load excess curve is outside the bearing capacity of the protection device;

[0131] Among them, the section limit at the first position and the section limit at the second position are both calculated dynamically.

[0132] Furthermore, the section limit includes the basic section limit and the ultimate section limit;

[0133] The calculation of basic section limit includes:

[0134] Calculating the difference between the current transmission current value and the rated transmission current value to obtain a first difference;

[0135] Calculate the basic section limit according to the first difference, where the basic section limit is the product of the first difference and the voltage;

[0136] The calculation of the ultimate section limit includes:

[0137] Obtaining a limiting current value according to a heat balance equation and calculating a difference between the limiting current value and a rated transmission current value to obtain a second difference value;

[0138] The limit section limit is calculated according to the second difference, and the limit section limit is the product of the second difference and the voltage.

[0139] Furthermore, it also includes:

[0140] A first determining unit is used to determine the number of fault conditions, where the number of fault conditions is multiple;

[0141] A second determining unit is used to determine a load transfer amount corresponding to the fault, where the load transfer amount includes a local load transfer amount and a foreign load transfer amount;

[0142] A fifth calculation unit, used for calculating the reception of the external load transfer amount at the second location;

[0143] The local load transfer amount and the foreign load transfer amount are adjusted according to the reception status of the foreign load transfer amount at the second location.

[0144] Furthermore, when the amount of external load transfer exceeds the basic section limit of the second position, the section limit of the first position is increased by the extreme section limit.

[0145] Furthermore, it also includes:

[0146] A sixth calculation unit, used for dynamically calculating the cross-sectional limit of the first position and the cross-sectional limit of the second position in time;

[0147] A first adjustment unit, configured to adjust the maximum load transfer amount based on a dynamic calculation result of a section limit at the first position and a section limit at the second position;

[0148] a seventh calculation unit, configured to calculate a load excess amount according to a maximum load transfer amount;

[0149] Among them, when the maximum load transfer amount is greater than the basic section limit of the second position, the extreme section limit of the first position is preferentially enabled.

[0150] Furthermore, it also includes:

[0151] The limit reference line is calculated using the sum of the basic section limit and the limit section limit of the first position and the sum of the basic section limit and the limit section limit of the second position;

[0152] The load excess curve is cut using the limit reference line. The portion of the load excess curve below the limit reference line is the acceptance area, and the portion of the load excess curve above the limit reference line is the non-acceptance area.

[0153] Furthermore, it also includes:

[0154] A third determining unit is used to determine an acceptance region that is directly associated with the non-acceptance region, where the acceptance region that is directly associated is located in front of the non-acceptance region and is adjacent to the non-acceptance region in time series;

[0155] an eighth calculation unit, used for calculating the heat generated by the receiving area having a directly associated relationship;

[0156] A correction unit, used for correcting the tolerance range of the protection device using the heat generated to obtain a correction amount;

[0157] The second adjustment unit is used to adjust the load excess amount curve in the vertical direction using the correction amount to obtain a new non-acceptance area.

[0158] In one example, the unit in any of the above devices can be one or more integrated circuits configured to implement the above methods, such as: one or more application specific integrated circuits (ASICs), or, one or more digital signal processors (DSPs), or, one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms.

[0159] For another example, when the units in the device can be implemented in the form of a processing element scheduling program, the processing element can be a general-purpose processor, such as a central processing unit (CPU) or other processor that can call a program. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0160] Various objects such as various messages / information / equipment / network elements / systems / devices / actions / operations / processes / concepts that may appear in this application are named. It can be understood that these specific names do not constitute a limitation on the relevant objects. The names assigned may change with factors such as scenarios, contexts or usage habits. The understanding of the technical meaning of the technical terms in this application should be mainly determined from the functions and technical effects embodied / executed in the technical scheme.

[0161] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0162] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0163] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0164] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0165] It should also be understood that in various embodiments of the present application, the first, second, etc. are only used to indicate that multiple objects are different. For example, the first time window and the second time window are only used to indicate different time windows. They should not have any impact on the time window itself, and the first, second, etc. mentioned above should not impose any limitations on the embodiments of the present application.

[0166] It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0167] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a computer-readable storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned computer-readable storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0168] The present application also provides a protection setting system applied to a large-scale high-voltage generator-transformer group, the system comprising:

[0169] one or more memories for storing instructions; and

[0170] One or more processors are used to call and run the instructions from the memory to execute the method as described above.

[0171] The present application also provides a computer program product, which includes instructions. When the instructions are executed, the terminal device and the network device perform operations of the terminal device and the network device corresponding to the above method.

[0172] The present application also provides a chip system, which includes a processor for implementing the functions involved in the above content, such as generating, receiving, sending, or processing the data and / or information involved in the above method.

[0173] The chip system may be composed of chips, or may include chips and other discrete devices.

[0174] The processor mentioned in any of the above places can be a CPU, a microprocessor, an ASIC, or one or more integrated circuits for executing programs for controlling the above-mentioned feedback information transmission method.

[0175] In a possible design, the chip system also includes a memory, which is used to store necessary program instructions and data. The processor and the memory can be decoupled and respectively set on different devices, connected by wire or wireless means to support the chip system to implement various functions in the above embodiments. Alternatively, the processor and the memory can also be coupled on the same device.

[0176] Optionally, the computer instructions are stored in a memory.

[0177] Optionally, the memory is a storage unit within the chip, such as a register, a cache, etc. The memory can also be a storage unit within the terminal located outside the chip, such as a ROM or other types of static storage devices that can store static information and instructions, RAM, etc.

[0178] It can be understood that the memory in the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories.

[0179] The non-volatile memory may be a ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), or a flash memory.

[0180] The volatile memory may be a RAM, which is used as an external cache. There are many different types of RAM, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct memory bus RAM.

[0181] The embodiments of this specific implementation method are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, all equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A protection setting method applied to a large-scale high-voltage generator-transformer group, characterized in that: include: Calculate the section limit of the first position and the section limit of the second position, the first position refers to the higher level power grid, and the second position refers to the lower level power grid; simulating a fault condition at a first location and determining a load transfer condition based on the fault condition at the first location; Determine the maximum load transfer amount according to the section limit at the second position; Calculate the load excess based on the maximum load transfer; Draw a load excess curve based on the calculated load excess; Analyze the load excess curve to obtain the acceptance area and non-acceptance area; Calculate whether the non-acceptance area of ​​the load excess curve is within the tolerance range of the protection device, and issue an alarm when the non-acceptance area of ​​the load excess curve is outside the tolerance range of the protection device; Among them, the section limit at the first position and the section limit at the second position are both calculated dynamically.

2. The protection setting method applied to a large-scale high-voltage generator-transformer group according to claim 1 is characterized in that: Section limits include basic section limits and ultimate section limits; The calculation of basic section limit includes: Calculating the difference between the current transmission current value and the rated transmission current value to obtain a first difference; Calculate the basic section limit according to the first difference, where the basic section limit is the product of the first difference and the voltage; The calculation of the ultimate section limit includes: Obtaining a limiting current value according to a heat balance equation and calculating a difference between the limiting current value and a rated transmission current value to obtain a second difference value; The limit section limit is calculated according to the second difference, and the limit section limit is the product of the second difference and the voltage.

3. The protection setting method applied to a large-scale high-voltage generator-transformer group according to claim 1 is characterized in that: Simulating a fault condition at a first location and determining a load transfer condition according to the fault condition at the first location includes: determining a number of fault conditions, the number of fault conditions being multiple; Determine the load transfer amount corresponding to the fault, the load transfer amount includes the local load transfer amount and the external load transfer amount; Calculate the reception of the out-of-town load transfer at the second location; The local load transfer amount and the foreign load transfer amount are adjusted according to the reception status of the foreign load transfer amount at the second location.

4. The protection setting method applied to a large-scale high-voltage generator-transformer group according to claim 3 is characterized in that: When the amount of external load transfer exceeds the basic section limit of the second position, the section limit of the first position is increased by the extreme section limit.

5. The protection setting method for large-scale high-voltage generator-transformer group according to any one of claims 2 to 4, characterized in that: The calculated load excess includes: Dynamically calculating the cross-sectional limit at the first position and the cross-sectional limit at the second position in time; adjusting the maximum load transfer amount based on the dynamically calculated result of the section limit at the first position and the section limit at the second position; Calculate the load excess based on the maximum load transfer; Among them, when the maximum load transfer amount is greater than the basic section limit of the second position, the extreme section limit of the first position is preferentially enabled.

6. The protection setting method applied to a large-scale high-voltage generator-transformer group according to claim 5 is characterized in that: By analyzing the load excess curve, the acceptance area and non-acceptance area are obtained, including: The limit reference line is calculated using the sum of the basic section limit and the limit section limit of the first position and the sum of the basic section limit and the limit section limit of the second position; The load excess curve is cut using the limit reference line. The portion of the load excess curve below the limit reference line is the acceptance area, and the portion of the load excess curve above the limit reference line is the non-acceptance area.

7. The protection setting method applied to a large-scale high-voltage generator-transformer group according to claim 6 is characterized in that: The non-acceptable area of ​​the load excess curve is checked, including: Determine the acceptance region that is directly associated with the non-acceptance region. In the time series, the acceptance region that is directly associated is located in front of the non-acceptance region and is adjacent to the non-acceptance region. Calculate the heat generated by the directly related receiving area; Use the heat value to calibrate the tolerance range of the protection equipment and obtain the correction value; The load excess curve is adjusted vertically using the correction amount to obtain a new non-acceptance region.

8. A protection setting device applied to large-scale high-voltage generator-transformer groups, characterized in that: include: A first calculation unit is used to calculate a section limit of a first position and a section limit of a second position, the first position refers to a higher level power grid, and the second position refers to a lower level power grid; a simulation unit, used to simulate a fault condition at the first location and determine a load transfer condition according to the fault condition at the first location; A second calculation unit, used to determine the maximum load transfer amount according to the section limit at the second position; a third calculation unit, configured to calculate a load excess amount according to a maximum load transfer amount; A curve drawing unit, used for drawing a load excess curve based on the calculated load excess; A curve analysis unit, used for analyzing the load excess curve to obtain an acceptance area and a non-acceptance area; A fourth calculation unit is used to calculate whether the non-acceptance area of ​​the load excess curve is within the bearing capacity of the protection device, and to issue an alarm when the non-acceptance area of ​​the load excess curve is outside the bearing capacity of the protection device; Among them, the section limit at the first position and the section limit at the second position are both calculated dynamically.

9. A protection setting system applied to large-scale high-voltage generator-transformer groups, characterized in that: The system comprises: one or more memories for storing instructions; and One or more processors, configured to call and execute the instructions from the memory to perform the method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer readable storage medium comprises: The program, when the program is executed by a processor, the method according to any one of claims 1 to 7 is executed.

Images