High-temperature gas cooled reactor direct-current system stage difference cooperation checking method

Abstract

The invention relates to the technical field of equipment management, and discloses a high-temperature gas cooled reactor direct-current system differential coordination checking method, which comprises the following steps of: acquiring storage battery parameters including storage battery capacity, battery pack end voltage in each period, battery internal resistance, connecting line resistance and battery quantity; according to the collected single storage battery parameters, determining storage battery pack parameters, and building a direct current system model; based on a direct current system model, calculating a subordinate switch outlet short-circuit current and a line tail end short-circuit current; the short-circuit current at the outlet of the lower-level switch and the short-circuit current at the tail end of the line are compared with the rated current of the upper-level switch, and the selectivity and the quickness under the fault condition are judged. Checking whether the stage difference cooperation between the upper and lower switch air switches of the direct current system meets the selectivity and quick action principle under the fault condition, and avoiding shortening of the service life of the direct current air switches and power failure of equipment in the field test process.

Description

Technical Field

[0001] The invention relates to the technical field of equipment management, and in particular to a method for verifying differential coordination of a high-temperature gas-cooled reactor DC system. Background Art

[0002] The public DC system of the high temperature gas-cooled reactor is placed in the conventional island plant. The system consists of a battery pack, a battery charging device and related protection and monitoring equipment of the DC system. It is an ungrounded system. When the DC system is operating normally, the charger supplies power to the power loads for control, measurement, protection and safe shutdown in the plant. After the nuclear power plant loses all AC power, the battery supplies power to the control, protection, measurement, DC emergency oil pump and other loads of the conventional island and its BOP (Balance of Plant, excluding the nuclear island) within the specified discharge time to ensure the safe shutdown of the unit, thereby protecting the safety of the equipment.

[0003] The DC system differential coordination refers to the protective coordination between the upper and lower levels of the DC circuit breaker. DC system accidents are very important for preventing power outages in the entire plant. The DC loads in the conventional island and BOP area of ​​the high-temperature gas-cooled reactor adopt a radial power supply method. DC distribution panels are set up in the 6kV medium-voltage distribution room, electrical relay room, 380V distribution room and desalted water distribution room to provide DC power to nearby loads. Its wide power supply range, large number of levels and large capacity lead to a relatively tight differential coordination of the system. At present, the power industry standard uses the selection of the rated current of the circuit breaker to achieve the differential coordination requirements. Although this method is theoretically reliable, in order to adapt to all types of systems and be executable, the standard requires a high capacity ratio of the two-stage air switch, which is basically impossible to achieve for systems with more levels. Even if it is achieved, it will cause the upper switch to select too large a capacity, reduce the protection sensitivity, and there is a possibility that the upper switch will refuse to operate, and the backup protection function will be lost when the system fails. Summary of the invention

[0004] In view of this, the present invention provides a method for calibrating differential coordination of a high temperature gas-cooled reactor DC system to solve the problem that differential coordination calibration cannot be achieved in the prior art.

[0005] In a first aspect, the present invention provides a method for verifying differential coordination of a high temperature gas-cooled reactor DC system, the method comprising:

[0006] Collect battery parameters, including battery capacity, battery terminal voltage at each period, battery internal resistance, connection line resistance and battery quantity;

[0007] Determine the battery pack parameters based on the collected single battery parameters and build a DC system model;

[0008] Based on the DC system model, calculate the short-circuit current at the downstream switch outlet and the short-circuit current at the end of the line;

[0009] Compare the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line with the rated current of the upper switch to determine the selectivity and quickness in the event of a fault.

[0010] The present invention uses battery parameters to build a DC system, simulates a short-circuit fault, calculates the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line, determines the fault current, and compares it with the rated current of the upper switch to check whether the level difference coordination between the upper and lower switch circuit breakers of the DC system meets the principles of selectivity and quickness in the event of a fault, thereby avoiding the disadvantages of shortening the service life of the DC circuit breaker and power outage of important equipment during on-site testing.

[0011] In an optional implementation, based on the DC system model, calculating the short-circuit current at the downstream switch outlet and the short-circuit current at the end of the line includes:

[0012] Taking the power supply as the starting point and the power load as the end point, the upper switch and the lower switch are grouped together. The short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line are calculated based on the battery initial discharge voltage and the battery final discharge voltage.

[0013] The present invention combines an upper switch and a lower switch into a group, considers the battery discharge initial voltage and the battery discharge final voltage, calculates the current under the short-circuit fault condition at the lower switch outlet and the current under the short-circuit fault condition at the line end, so as to ensure the normal operation of the circuit breaker and prevent false operation.

[0014] In an optional implementation, the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line are compared with the rated current of the upper switch to determine the selectivity and quickness under the fault condition, including:

[0015] If the instantaneous protection of the lower switch and the short-delay protection of the upper switch are triggered, it is determined that the selectivity and speed requirements are met.

[0016] The present invention, when triggering the instantaneous protection of the lower switch and the short-delay protection of the upper switch, satisfies the requirements of selectivity and quickness, so that the lower switch closest to the fault point is immediately actuated, and the upper switch is protected against false operation through the short-delay protection, so as to ensure that the fault is limited to the minimum range and other equipment can work normally.

[0017] In an optional implementation, the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line are compared with the rated current of the upper switch to determine the selectivity and quickness under the fault condition, including:

[0018] If the short-time delay protection of the lower switch is triggered but is less than the rated current of the upper switch, it is determined that the selectivity requirement is met but the speed requirement is not met.

[0019] The present invention limits the fault range to a minimum range by triggering the short-delay protection of the lower-level switch but causing the current to be less than the rated current of the upper-level switch so that only the lower-level switch is actuated without causing the upper-level switch to actuate. By setting the short-delay protection, false operations caused by instantaneous overload or short-term current fluctuations are avoided, thereby improving stability.

[0020] In an optional implementation, the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line are compared with the rated current of the upper switch to determine the selectivity and quickness under the fault condition, including:

[0021] If the short-time delay protection of the lower switch and the upper switch is triggered, and the extreme difference multiples of the rated capacity of the two switches are within the preset range, it is determined that the selectivity requirement is met but the speed requirement is not met.

[0022] The present invention ensures that the lower-level switch takes precedence by setting the rated capacity level difference multiple range of the two-level switch, and ensures that the upper-level switch will not malfunction, so as to accurately isolate and reduce the impact range.

[0023] In an optional embodiment, the method further includes:

[0024] Perform an ampere-second characteristic test to verify whether the actual ampere-second characteristic of the switch is within the error range.

[0025] The present invention verifies the actual ampere-second characteristic of the switch through an ampere-second characteristic test to verify the accuracy of the calibration method and provide data support for subsequent improvement and optimization.

[0026] In an optional embodiment, the method further includes:

[0027] When a switch type change is detected, selectivity and quickness under fault conditions are re-evaluated.

[0028] The present invention re-judges the selectivity and quickness of differential matching in the event of a fault in the switch model to ensure that the equipment meets the specifications.

[0029] In a second aspect, the present invention provides a device for checking the level difference coordination of a high temperature gas-cooled reactor DC system, the device comprising:

[0030] The acquisition module is used to acquire battery parameters, including battery capacity, battery terminal voltage at each period, battery internal resistance, connection line resistance and battery quantity;

[0031] A building module is used to determine the battery pack parameters based on the collected single battery parameters and build a DC system model;

[0032] A calculation module, used for calculating the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line based on the DC system model;

[0033] The judgment module is used to compare the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line with the rated current of the upper switch to judge the selectivity and quickness under fault conditions.

[0034] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the computer instructions to execute the method for verifying the level difference coordination of a high temperature gas-cooled reactor DC system according to the first aspect or any corresponding embodiment thereof.

[0035] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method for verifying the differential coordination of a high temperature gas-cooled reactor DC system according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a flow chart of a method for checking differential coordination of a high temperature gas-cooled reactor DC system according to an embodiment of the present invention;

[0038] Figure 2 is a schematic diagram of a DC system according to an embodiment of the present invention;

[0039] Figure 3 is a structural block diagram of a device for checking the level difference coordination of a high temperature gas-cooled reactor DC system according to an embodiment of the present invention;

[0040] Figure 4 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] The embodiment of the present invention takes a high-temperature reactor as an example, and checks the coordination relationship of multiple groups of upper and lower switches in the entire DC system according to the load characteristics in the plant. Based on the principle of taking both reliability and sensitivity into consideration, after a fault occurs, as long as the load within the fault range can be reliably removed and the equipment outside the fault range can maintain operation, it is considered that the differential coordination requirements are met.

[0043] According to an embodiment of the present invention, an embodiment of a method for verifying the differential coordination of a high-temperature gas-cooled reactor DC system is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0044] In this embodiment, a method for checking the differential coordination of a high temperature gas-cooled reactor DC system is provided. Figure 1 FIG. 1 is a flow chart of a method for checking differential coordination of a high temperature gas-cooled reactor DC system according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0045] Step S101, collecting battery parameters.

[0046] In the embodiment of the present invention, battery parameters in the DC system are collected, and the battery parameters include battery capacity, battery terminal voltage at each period, battery internal resistance, connection line resistance, battery quantity, etc.

[0047] Step S102, determining the battery pack parameters according to the collected single battery parameters, and building a DC system model.

[0048] In the embodiment of the present invention, the collected single battery parameters are calculated and sorted to form the parameters of larger components, and the DC system is built. The detailed wiring diagram of the DC system is as follows: Figure 2 shown.

[0049] Step S103, based on the DC system model, calculate the short-circuit current at the downstream switch outlet and the short-circuit current at the end of the line.

[0050] In the embodiment of the present invention, Figure 2As shown, starting from the battery outlet fuse, two switches are grouped together to calculate the fault current under two fault conditions: short circuit at the outlet of the lower switch and short circuit at the end of the line.

[0051] Step S104, comparing the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line with the rated current of the upper switch to determine the selectivity and quickness under a fault condition.

[0052] In the embodiment of the present invention, the fault current is compared with the rated current of the upper switch to determine the fault from the outlet of the faulty lower switch to the end of the line, and the selectivity and quickness under the fault condition are judged.

[0053] The method for verifying the differential coordination of the high-temperature gas-cooled reactor DC system provided in this embodiment uses battery parameters to build a DC system, simulates a short-circuit fault, calculates the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line, determines the fault current, and compares it with the rated current of the upper switch to verify whether the differential coordination between the upper and lower switch circuit breakers of the DC system meets the principles of selectivity and quickness in the event of a fault, thereby avoiding the disadvantages of shortening the service life of the DC circuit breaker and power outage of important equipment during on-site testing.

[0054] In this embodiment, a method for checking the differential coordination of a high temperature gas-cooled reactor DC system is provided, and the process includes the following steps:

[0055] Step S201, collecting battery parameters.

[0056] For details, please see Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0057] Step S202, determining the battery pack parameters according to the collected single battery parameters, and building a DC system model.

[0058] For details, please see Figure 1 Step S102 of the illustrated embodiment will not be described in detail here.

[0059] Step S203, based on the DC system model, calculate the short-circuit current at the downstream switch outlet and the short-circuit current at the end of the line.

[0060] Specifically, the above step S203 includes:

[0061] Step S2031, taking the power supply as the starting point and the power load as the end point, taking the upper switch and the lower switch as a group, and calculating the short-circuit current at the lower switch outlet and the short-circuit current at the end of the line according to the battery discharge initial voltage and the battery discharge final voltage.

[0062] In the embodiment of the present invention, the power supply is taken as the starting point, the power load is taken as the end point, all switches connected in series in the entire loop are included, and two switches are taken as a group to calculate the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line.

[0063] Specifically, the DC short-circuit fault current is a range quantity that depends on the battery voltage. At the beginning of discharge, the battery voltage is the highest, and the fault current is the largest. At the end of discharge, the battery voltage is the lowest, and the fault current is the lowest. The voltages at the beginning and end of battery discharge are provided by the manufacturer, and are usually replaced by the battery's float charge voltage and discharge termination voltage. After determining the voltage, use Ohm's law to calculate the short-circuit current. Since the fault location is uncertain, it is assumed that the output of the downstream switch and the end of the line are the maximum and minimum current values, respectively.

[0064] By combining the upper switch and the lower switch into a group, considering the initial discharge voltage of the battery and the final discharge voltage of the battery, the current under the short-circuit fault at the outlet of the lower switch and the current under the short-circuit fault at the end of the line are calculated to ensure the normal operation of the circuit breaker and prevent false operation.

[0065] Step S204, comparing the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line with the rated current of the upper switch to determine the selectivity and quickness under a fault condition.

[0066] Specifically, for a DC system with a large number of stages, the above step S204 includes:

[0067] Step S2041: If the instantaneous protection of the lower switch and the short-delay protection of the upper switch are triggered, it is determined that the selectivity and quickness requirements are met.

[0068] In the embodiment of the present invention, the fault current can trigger the instantaneous protection of the lower switch and the short-delay protection of the upper switch, so that the action speed of the lower switch is faster and the cut-off range is minimum, and it is determined that the selectivity and speed requirements are met.

[0069] By triggering the instantaneous protection of the lower switch and the short-delay protection of the upper switch, in order to meet the requirements of selectivity and speed, the lower switch closest to the fault point is immediately actuated, and the upper switch avoids false operation through short-delay protection, so as to ensure that the fault is limited to the minimum range and ensure the normal operation of other equipment.

[0070] Step S2042: If the short-delay protection of the lower switch is triggered but the current is less than the rated current of the upper switch, it is determined that the selectivity requirement is met but the speed requirement is not met.

[0071] In the embodiment of the present invention, the fault current can trigger the short-delay protection of the lower-level switch, but is less than the rated current of the upper-level switch. When a fault occurs, only the lower-level switch is actuated. It is determined that the selectivity requirement is met, but the speed requirement is not met. However, since the differential coordination is mainly reflected in the selectivity, it can also be considered to meet the requirements.

[0072] By triggering the short-delay protection of the lower-level switch but when the current is less than the rated current of the upper-level switch, only the lower-level switch will be actuated without causing the upper-level switch to actuate, thus limiting the fault range to the minimum range. By setting the short-delay protection, false operations caused by instantaneous overload or short-term current fluctuations can be avoided, thereby improving stability.

[0073] Step S2043, if the short-delay protection of the lower switch and the upper switch is triggered, and the range multiples of the rated capacities of the two switches are within a preset range, it is determined that the selectivity requirement is met but the speed requirement is not met.

[0074] In the embodiment of the present invention, the fault current can trigger the short-delay protection of the lower-level switch and the upper-level switch, and the rated capacity of the two-level switches has a step difference of 2-3 times. When a fault occurs, only the lower-level switch is actuated. It is determined that the selectivity requirement is met, but the speed requirement is not met. However, since the step difference coordination is mainly reflected in the selectivity, it can also be considered to meet the requirements.

[0075] The fault current can trigger the short-delay protection of the lower switch and the upper switch, and the rated capacity difference of the two switches is less than 2 times. Due to the limitations of manufacturing process and other reasons, they may act simultaneously in the event of a fault. The theoretical analysis may have large errors. It is necessary to conduct a short-circuit test on this model of switch. The short-circuit current is within the calculated current range, and the test results are used to determine whether it is selectivity.

[0076] By setting the rated capacity difference multiple range of the two-stage switch, it is ensured that the lower-stage action takes priority and the upper-stage switch does not malfunction, so as to achieve precise isolation and reduce the scope of impact.

[0077] In some optional embodiments, the method further comprises:

[0078] Step S205 , performing an ampere-second characteristic test to verify whether the actual ampere-second characteristic of the switch is within an error range.

[0079] In the embodiment of the present invention, in order to verify the accuracy of the cross-check method, a switch ampere-second characteristic test is carried out on site, compared with the standard ampere-second characteristic curve, and it is verified whether the actual ampere-second characteristic of the switch is within the error range.

[0080] The actual ampere-second characteristics of the switch are verified through the ampere-second characteristic test to verify the accuracy of the calibration method and provide data support for subsequent improvements and optimizations.

[0081] In some optional embodiments, the method further comprises:

[0082] Step S206, when a switch model change is detected, re-determine the selectivity and quickness under a fault condition.

[0083] In the embodiment of the present invention, data and formulas are used to establish a DC system differential coordination account, build a calculation system, and embed calculation formulas to facilitate differential coordination verification after subsequent equipment model adjustment, wherein the data mainly includes the model and parameters of switches in the system, the voltage and internal resistance of the battery, the model and resistance of the cable, etc. Specifically, the parameters can be entered into a table, and the formulas are listed to automatically adjust the parameters of the specified position.

[0084] When the switch model changes, its parameters will also change, and the value of the fault current calculated by the formula will also change accordingly. The changed current can be used to re-judge the selectivity and quickness of the differential coordination under fault conditions.

[0085] The method for checking differential coordination of a high-temperature gas-cooled reactor DC system provided in this embodiment re-judges the selectivity and quickness of differential coordination in the event of a fault by re-judging the switch model to ensure that the equipment complies with the specifications.

[0086] In this embodiment, a device for checking the level difference coordination of a high temperature gas-cooled reactor DC system is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and will not be repeated hereafter. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0087] This embodiment provides a device for checking the level difference coordination of a high temperature gas-cooled reactor DC system. Figure 3 As shown, including:

[0088] The acquisition module 301 is used to acquire battery parameters, which include battery capacity, battery terminal voltage at each period, battery internal resistance, connection line resistance and battery quantity.

[0089] The building module 302 is used to determine the battery pack parameters according to the collected single battery parameters and build a DC system model.

[0090] The calculation module 303 is used to calculate the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line based on the DC system model.

[0091] The judgment module 304 is used to compare the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line with the rated current of the upper switch to judge the selectivity and quickness under fault conditions.

[0092] In some optional implementations, the calculation module 303 includes:

[0093] The calculation unit is used to calculate the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line according to the battery initial discharge voltage and the battery final discharge voltage, with the power supply as the starting point and the power load as the end point, with the upper switch and the lower switch as a group.

[0094] In some optional implementations, the determination module 304 includes:

[0095] The first determination unit is used to determine whether the selectivity and speediness requirements are met if the instantaneous protection of the lower switch and the short-delay protection of the upper switch are triggered.

[0096] In some optional implementations, the determination module 304 further includes:

[0097] The second determination unit is used to determine that the selectivity requirement is met but the speed requirement is not met if the short-delay protection of the lower switch is triggered but the current is less than the rated current of the upper switch.

[0098] In some optional implementations, the determination module 304 further includes:

[0099] The third determination unit is used to determine that the selectivity requirement is met but the speed requirement is not met if the short-delay protection of the lower switch and the upper switch is triggered and the extreme difference multiples of the rated capacity of the two switches are within a preset range.

[0100] In some optional embodiments, the device further comprises:

[0101] The verification module is used to perform an ampere-second characteristic test to verify whether the actual ampere-second characteristic of the switch is within the error range.

[0102] In some optional embodiments, the device further comprises:

[0103] The re-judgment module is used to re-judgment the selectivity and quickness under fault conditions when a switch model change is detected.

[0104] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0105] The calibration device for the differential coordination of the high-temperature gas-cooled reactor DC system in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0106] The embodiment of the present invention also provides a computer device having the above Figure 3 The device shown is for checking the level difference coordination of the high temperature gas-cooled reactor DC system.

[0107] See also Figure 4 , Figure 4 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 4 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 4 A processor 10 is taken as an example.

[0108] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0109] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0110] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0111] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0112] The computer device also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 4 The example of connecting through bus is taken in the following.

[0113] The input device 30 can receive input digital or character information and generate key signal input related to user settings and function control of the computer device, such as a touch screen, etc. The output device 40 can include a display device, etc.

[0114] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0115] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0116] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope of the present application.

Claims

1. A method for checking the differential coordination of a high temperature gas-cooled reactor DC system, characterized in that: The method comprises: Collecting battery parameters, including battery capacity, battery terminal voltage at each period, battery internal resistance, connection line resistance and battery quantity; Determine the battery pack parameters based on the collected single battery parameters and build a DC system model; Based on the DC system model, the short-circuit current at the downstream switch outlet and the short-circuit current at the end of the line are calculated; Compare the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line with the rated current of the upper switch to determine the selectivity and quickness in the event of a fault.

2. The method according to claim 1, characterized in that: The step of calculating the short-circuit current at the downstream switch outlet and the short-circuit current at the end of the line based on the DC system model includes: Taking the power supply as the starting point and the power load as the end point, the upper switch and the lower switch are grouped together. The short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line are calculated based on the battery initial discharge voltage and the battery final discharge voltage.

3. The method according to claim 1, characterized in that: The short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line are compared with the rated current of the upper switch to judge the selectivity and quickness under the fault condition, including: If the instantaneous protection of the lower switch and the short-delay protection of the upper switch are triggered, it is determined that the selectivity and speed requirements are met.

4. The method according to claim 1, characterized in that The short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line are compared with the rated current of the upper switch to judge the selectivity and quickness under the fault condition, including: If the short-time delay protection of the lower switch is triggered but is less than the rated current of the upper switch, it is determined that the selectivity requirement is met but the speed requirement is not met.

5. The method according to claim 1, characterized in that The short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line are compared with the rated current of the upper switch to judge the selectivity and quickness under the fault condition, including: If the short-time delay protection of the lower switch and the upper switch is triggered, and the extreme difference multiples of the rated capacity of the two switches are within the preset range, it is determined that the selectivity requirement is met but the speed requirement is not met.

6. The method according to claim 1, characterized in that The method further comprises: Perform an ampere-second characteristic test to verify whether the actual ampere-second characteristic of the switch is within the error range.

7. The method according to claim 1, characterized in that The method further comprises: When a switch type change is detected, selectivity and quickness under fault conditions are re-evaluated.

8. A device for checking the level difference coordination of a high temperature gas-cooled reactor DC system, characterized in that: The device comprises: A collection module is used to collect battery parameters, wherein the battery parameters include battery capacity, battery terminal voltage at each period, battery internal resistance, connection line resistance and battery quantity; A building module is used to determine the battery pack parameters based on the collected single battery parameters and build a DC system model; A calculation module, used for calculating the short-circuit current at the downstream switch outlet and the short-circuit current at the end of the line based on the DC system model; The judgment module is used to compare the short-circuit current at the outlet of the lower switch and the short-circuit current at the end of the line with the rated current of the upper switch to judge the selectivity and quickness under fault conditions.

9. A computer device, characterized in that: include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method for verifying the differential coordination of a high temperature gas-cooled reactor DC system according to any one of claims 1 to 7 by executing the computer instructions.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method for verifying the differential coordination of a high-temperature gas-cooled reactor DC system according to any one of claims 1 to 7.

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