A real-time calculation method, device and equipment of effective short-circuit ratio and storage medium

Abstract

The application discloses a real-time calculation method and device of an effective short-circuit ratio, equipment and a storage medium, and the method comprises the following steps: obtaining reactive power capacity change values of a converter before and after a commutation angle change in a direct-current system; obtaining voltage change values of an alternating-current bus in the converter before and after the commutation angle change; calculating system short-circuit capacity of an alternating-current system corresponding to the direct-current system according to the reactive power capacity change values and the voltage change values; and calculating the corresponding effective short-circuit ratio by using the system short-circuit capacity. In the application, the actual system short-circuit capacity of the alternating-current system is calculated by means of the reactive power capacity change values of the converter and the voltage change values of the alternating-current bus in the converter, and then the effective short-circuit ratio of the alternating-current system can be calculated in real time based on the system short-circuit capacity, so that the technical problem that the effective short-circuit ratio of the existing alternating-current system cannot be calculated in real time is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission, and particularly relates to a real-time calculation method and device for effective short circuit ratio, equipment and a storage medium. BACKGROUND

[0002] With the development of power transmission technology, the traditional DC technology based on thyristor commutation has been widely applied. Since a large amount of reactive power needs to be consumed in the operation of the DC system, the AC system connected with the DC system needs to provide reactive power support. The support capability of the AC system for the DC system is usually described by a short circuit ratio (SCR).

[0003] However, since the DC system is usually configured with an AC filter and other reactive power compensation devices at the converter station, this part of the reactive power does not belong to the reactive power provided by the AC system, and therefore an effective short circuit ratio (ESCR) is further used to represent the support capability of the AC system for the DC system.

[0004] If the real-time situation of the effective short circuit ratio is known, different control parameters can be taken according to different values of the effective short circuit ratio to maintain stable operation of the DC system. However, since the real short circuit capacity in the AC system for calculating the effective short circuit ratio cannot be monitored in real time, the real-time value of the effective short circuit ratio cannot be grasped. SUMMARY

[0005] Therefore, the present application provides a real-time calculation method and device for effective short circuit ratio, equipment and a storage medium, which solves the technical problem that the effective short circuit ratio of the existing AC system cannot be calculated in real time.

[0006] The first aspect of the present application provides a real-time calculation method for effective short circuit ratio, comprising:

[0007] obtaining a reactive power capacity change value of a converter before and after a commutation angle change of the converter in a DC system;

[0008] obtaining a voltage change value of an AC bus in the converter before and after the commutation angle change of the converter;

[0009] calculating a system short circuit capacity of an AC system corresponding to the DC system according to the reactive power capacity change value and the voltage change value;

[0010] calculating a corresponding effective short circuit ratio by using the system short circuit capacity.

[0011] Optionally, the obtaining of the reactive power capacity change value of the converter before and after the commutation angle change of the converter in the DC system comprises:

[0012] obtaining a first reactive power capacity of the converter before the commutation angle change of the converter in the DC system;

[0013] obtaining a second reactive power capacity of the converter after the commutation angle change;

[0014] combining the first reactive power capacity and the second reactive power capacity, and calculating a reactive power capacity change value of the converter before and after the commutation angle change.

[0015] Optionally, the first reactive power capacity of the converter before the commutation angle change in the DC system is obtained, and specifically includes:

[0016] obtaining a first commutation overlap angle and a first converter power factor angle of the converter before the commutation angle change in the DC system;

[0017] calculating the first reactive power capacity according to the first commutation overlap angle and the first converter power factor angle.

[0018] Optionally, the second reactive power capacity of the converter after the commutation angle change is obtained, and specifically includes:

[0019] obtaining a second commutation overlap angle and a second converter power factor angle of the converter after the commutation angle change;

[0020] calculating the second reactive power capacity according to the second commutation overlap angle and the second converter power factor angle.

[0021] Optionally, the voltage change value is a voltage change rate.

[0022] obtaining a voltage change value of an AC bus in the converter before and after the commutation angle change, and specifically includes:

[0023] obtaining a first voltage of the AC bus in the converter before the commutation angle change;

[0024] obtaining a second voltage of the AC bus after the commutation angle change;

[0025] calculating a voltage change rate of the AC bus based on a first formula and combining the first voltage and the second voltage, wherein the first formula is:

[0026]

[0027] In the formula, ΔU is the voltage change rate of the AC bus in the converter before and after the commutation angle change, U t2 is the second voltage at time t2 after the commutation angle change, U t1 is the first voltage at time t1 before the commutation angle change, and U j is an average voltage of a voltage grade in which the AC bus voltage is located.

[0028] Optionally, the system short circuit capacity of the AC system corresponding to the DC system is calculated according to the reactive power capacity change value and the voltage change value, and specifically includes:

[0029] The system short circuit capacity of the AC system corresponding to the DC system is calculated according to the reactive power capacity change value and the voltage change value based on a second formula, wherein the second formula is:

[0030]

[0031] In the formula, S ac is the system short circuit capacity of the AC system, ΔQ s is the reactive power capacity change value of the converter before and after the commutation angle change in the DC system.

[0032] Optionally, when the converter is operated in the converter mode, the commutation angle is a trigger angle in the converter.

[0033] When the converter is operated in the inverter mode, the commutation angle is an arc extinction angle in the converter.

[0034] The second aspect of the application provides a real-time calculation device of the effective short circuit ratio, comprising:

[0035] A first acquisition unit is configured to acquire a reactive power capacity change value of a converter before and after a commutation angle change in the converter in a DC system.

[0036] A second acquisition unit is configured to acquire a voltage change value of an AC bus in the converter before and after the commutation angle change.

[0037] A first calculation unit is configured to calculate a system short circuit capacity of an AC system corresponding to the DC system according to the reactive power capacity change value and the voltage change value.

[0038] A second calculation unit is configured to calculate a corresponding effective short circuit ratio by using the system short circuit capacity.

[0039] The third aspect of the application provides a real-time calculation device of the effective short circuit ratio, comprising a processor and a memory.

[0040] The memory is configured to store program code and transmit the program code to the processor.

[0041] The processor is configured to execute the real-time calculation method of the effective short circuit ratio according to the instructions in the program code.

[0042] The fourth aspect of the application provides a storage medium configured to store program code, and the program code is configured to execute the real-time calculation method of the effective short circuit ratio.

[0043] From the above technical solutions, the present application has the following advantages:

[0044] The present application provides a real-time calculation method of effective short-circuit ratio, comprising: obtaining the reactive power capacity change value of the converter before and after the commutation angle change in the DC system; obtaining the voltage change value of the AC bus in the converter before and after the commutation angle change; calculating the system short-circuit capacity of the corresponding AC system of the DC system according to the reactive power capacity change value and the voltage change value; and calculating the corresponding effective short-circuit ratio with the system short-circuit capacity. In the present application, the actual system short-circuit capacity of the AC system is calculated by means of the reactive power capacity change value of the converter and the voltage change value of the AC bus in the converter, and then the effective short-circuit ratio of the AC system can be calculated in real time based on the system short-circuit capacity, thereby solving the technical problem that the effective short-circuit ratio of the existing AC system cannot be calculated in real time. BRIEF DESCRIPTION OF DRAWINGS

[0045] 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.

[0046] Figure 1 The flowchart of embodiment one of the real-time calculation method of effective short-circuit ratio in the embodiments of the present application;

[0047] Figure 2 The flowchart of embodiment two of the real-time calculation method of effective short-circuit ratio in the embodiments of the present application;

[0048] Figure 3 The structural diagram of the real-time calculation device of effective short-circuit ratio in the embodiments of the present application. DETAILED DESCRIPTION

[0049] The embodiments of the present application provide a real-time calculation method, device, equipment and storage medium of effective short-circuit ratio, which solves the technical problem that the effective short-circuit ratio of the existing AC system cannot be calculated in real time.

[0050] In order to make the personnel in the technical field better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0051] The first aspect of the embodiment of the present application provides an embodiment of a real-time calculation method of an effective short-circuit ratio.

[0052] Please refer to Figure 1 The flowchart of the embodiment one of the real-time calculation method of the effective short-circuit ratio in the embodiment of the present application is shown in the figure.

[0053] The real-time calculation method of the effective short-circuit ratio in the embodiment includes:

[0054] In step 101, the reactive power capacity change value of the converter in the DC system before and after the commutation angle change is obtained.

[0055] It can be understood that the commutation angle in the embodiment can be the trigger angle of the rectifier side or the extinction angle of the inverter side, and the specific selection can be made by the person skilled in the art according to the needs, which is not specifically limited and described herein. In step 102, the voltage change value of the AC bus in the converter before and after the commutation angle change is obtained.

[0056] In step 103, the system short-circuit capacity of the corresponding AC system of the DC system is calculated according to the reactive power capacity change value and the voltage change value.

[0057] In step 104, the corresponding effective short-circuit ratio is calculated by using the system short-circuit capacity.

[0058] The calculation method of the effective short-circuit ratio in the embodiment includes: obtaining the reactive power capacity change value of the converter in the DC system before and after the commutation angle change; obtaining the voltage change value of the AC bus in the converter before and after the commutation angle change; calculating the system short-circuit capacity of the corresponding AC system of the DC system according to the reactive power capacity change value and the voltage change value; and calculating the corresponding effective short-circuit ratio by using the system short-circuit capacity. In the present application, the actual system short-circuit capacity of the AC system is calculated by means of the reactive power capacity change value of the converter and the voltage change value of the AC bus in the converter, and then the effective short-circuit ratio of the AC system can be calculated in real time based on the system short-circuit capacity, thereby solving the technical problem that the effective short-circuit ratio of the existing AC system cannot be calculated in real time.

[0059] The above is the embodiment one of the real-time calculation method of the effective short-circuit ratio provided in the embodiment of the present application, and the following is the embodiment two of the real-time calculation method of the effective short-circuit ratio provided in the embodiment of the present application.

[0060] Please refer to Figure 2 The flowchart of the embodiment two of the real-time calculation method of the effective short-circuit ratio in the embodiment of the present application is shown in the figure.

[0061] The real-time calculation method of the effective short-circuit ratio in the embodiment includes:

[0062] In step 201, the first reactive power capacity of the converter before the commutation angle changes in the DC system is obtained.

[0063] It can be understood that the first reactive power capacity of the converter before the commutation angle changes in the DC system is obtained in the embodiment, and specifically includes:

[0064] The first commutation overlap angle and the first converter power factor angle of the converter before the commutation angle changes in the DC system are obtained.

[0065] The first reactive power capacity is calculated according to the first commutation overlap angle and the first converter power factor angle.

[0066] In step 202, the second reactive power capacity of the converter after the commutation angle changes is obtained.

[0067] It can be understood that the second reactive power capacity of the converter after the commutation angle changes is obtained, and specifically includes:

[0068] The second commutation overlap angle and the second converter power factor angle of the converter after the commutation angle changes are obtained.

[0069] The second reactive power capacity is calculated according to the second commutation overlap angle and the second converter power factor angle.

[0070] It can be understood that the calculation formula of the commutation overlap angle μ is:

[0071]

[0072] In the formula, α is the commutation angle of the converter, I d is the DC current, U d is the DC voltage, and the above values are all measured values; U di0 is the single-pole ideal DC no-load voltage, E ll is the no-load voltage (line voltage effective value) of the valve side winding of the converter transformer.

[0073] The calculation formula of the converter power factor angle φ is:

[0074]

[0075] The calculation formula of the reactive power capacity is:

[0076]

[0077] In the formula, P is the measured DC power transmission power.

[0078] In step 203, the reactive power capacity change value of the converter before and after the commutation angle changes is calculated by combining the first reactive power capacity and the second reactive power capacity.

[0079] In the embodiment, the reactive power capacity change value is:

[0080] ΔQ dc ≈Q dc2 -ΔQ dc1 .

[0081] In the formula, Q dc2 is the second reactive capacity, ΔQ dc1 is the first reactive capacity.

[0082] Step 204, obtaining the first voltage of the AC bus in the converter before the commutation angle changes.

[0083] Step 205, obtaining the second voltage of the AC bus after the commutation angle changes.

[0084] Step 206, calculating the voltage change rate of the AC bus based on the first formula combined with the first voltage and the second voltage.

[0085] Wherein, the first formula is:

[0086]

[0087] In the formula, ΔU is the voltage change rate of the AC bus in the converter before and after the commutation angle changes, U t2 is the second voltage at time t2 after the commutation angle changes, U t1 is the first voltage at time t1 before the commutation angle changes, U j is the average voltage of the voltage level where the AC bus voltage is located.

[0088] Step 207, calculating the system short circuit capacity of the AC system corresponding to the DC system based on the reactive capacity change value and the voltage change value according to the second formula.

[0089] Wherein, the second formula is:

[0090]

[0091] In the formula, S ac is the system short circuit capacity of the AC system, ΔQ s is the reactive capacity change value of the converter in the DC system before and after the commutation angle changes.

[0092] Step 208, calculating the corresponding effective short circuit ratio using the system short circuit capacity.

[0093] The calculation method of the effective short-circuit ratio in the embodiment includes: obtaining reactive power capacity change values of a converter before and after a commutation angle change of the converter in a direct current system; obtaining voltage change values of an alternating current bus in the converter before and after the commutation angle change; calculating system short-circuit capacities of an alternating current system corresponding to the direct current system according to the reactive power capacity change values and the voltage change values; and calculating corresponding effective short-circuit ratios by using the system short-circuit capacities. In the application, the actual system short-circuit capacities of the alternating current system are calculated by means of the reactive power capacity change values of the converter and the voltage change values of the alternating current bus in the converter, and the effective short-circuit ratios of the alternating current system can be calculated in real time based on the system short-circuit capacities, thereby solving the technical problem that the effective short-circuit ratios of the existing alternating current system cannot be calculated in real time.

[0094] The second aspect of the embodiment of the application provides an embodiment of a real-time calculation device of an effective short-circuit ratio.

[0095] Please refer to Figure 3 The structure diagram of the real-time calculation device of the effective short-circuit ratio in the embodiment of the application.

[0096] The real-time calculation device of the effective short-circuit ratio in the embodiment includes:

[0097] A first obtaining unit is configured to obtain reactive power capacity change values of a converter before and after a commutation angle change of the converter in a direct current system.

[0098] A second obtaining unit is configured to obtain voltage change values of an alternating current bus in the converter before and after the commutation angle change.

[0099] A first calculation unit is configured to calculate system short-circuit capacities of an alternating current system corresponding to the direct current system according to the reactive power capacity change values and the voltage change values.

[0100] A second calculation unit is configured to calculate corresponding effective short-circuit ratios by using the system short-circuit capacities.

[0101] Optionally, the reactive power capacity change values of the converter before and after the commutation angle change in the direct current system are obtained, and the method specifically includes:

[0102] A first reactive power capacity of the converter before the commutation angle change in the direct current system is obtained.

[0103] A second reactive power capacity of the converter after the commutation angle change is obtained.

[0104] The reactive power capacity change values of the converter before and after the commutation angle change are calculated in combination with the first reactive power capacity and the second reactive power capacity.

[0105] Optionally, the first reactive power capacity of the converter before the commutation angle change in the direct current system is obtained, and the method specifically includes:

[0106] The first commutation overlap angle and the first converter power factor angle of the converter before the commutation angle change are obtained.

[0107] The first reactive power capacity is calculated according to the first commutation overlap angle and the first converter power factor angle.

[0108] Optionally, the second reactive power capacity of the converter after the commutation angle change is obtained, and the method specifically comprises:

[0109] The second commutation overlap angle and the second converter power factor angle of the converter after the commutation angle change are obtained.

[0110] The second reactive power capacity is calculated according to the second commutation overlap angle and the second converter power factor angle.

[0111] Optionally, the voltage change value is a voltage change rate.

[0112] The voltage change value of the AC bus in the converter before and after the commutation angle change is obtained, and the method specifically comprises:

[0113] The first voltage of the AC bus in the converter before the commutation angle change is obtained.

[0114] The second voltage of the AC bus after the commutation angle change is obtained.

[0115] The voltage change rate of the AC bus is calculated according to the first formula and the first voltage and the second voltage, wherein the first formula is:

[0116]

[0117] In the formula, ΔU is the voltage change rate of the AC bus in the converter before and after the commutation angle change, U t2 is the second voltage at time t2 after the commutation angle change, U t1 is the first voltage at time t1 before the commutation angle change, and U j is the average voltage of the voltage grade of the AC bus voltage.

[0118] Optionally, the system short circuit capacity of the AC system corresponding to the DC system is calculated according to the reactive power capacity change value and the voltage change value, and the method specifically comprises:

[0119] The system short circuit capacity of the AC system corresponding to the DC system is calculated according to the reactive power capacity change value and the voltage change value based on the second formula, wherein the second formula is:

[0120]

[0121] In the formula, S ac is the system short circuit capacity of the AC system, and ΔQ sThe reactive power capacity change value of the converter before and after the commutation angle change.

[0122] Optionally, when the converter is operated in the converter mode, the commutation angle is a firing angle in the converter.

[0123] When the converter is operated in the inverter mode, the commutation angle is an arc extinction angle in the converter.

[0124] In the embodiment, the actual system short circuit capacity of the AC system is calculated by means of the reactive power capacity change value of the converter and the voltage change value of the AC bus in the converter, and the effective short circuit ratio of the AC system can be calculated in real time based on the system short circuit capacity, so that the technical problem that the effective short circuit ratio of the existing AC system cannot be calculated in real time is solved.

[0125] The third aspect of the embodiment of the application provides an embodiment of a real-time calculation device of an effective short circuit ratio.

[0126] A real-time calculation device of an effective short circuit ratio, comprising a processor and a memory; the memory is used for storing program code and transmitting the program code to the processor; the processor is used for executing the real-time calculation method of the effective short circuit ratio according to the instructions in the program code.

[0127] The fourth aspect of the embodiment of the application provides an embodiment of a storage medium.

[0128] A storage medium, the storage medium is used for storing program code, and the program code is used for executing the real-time calculation method of the effective short circuit ratio.

[0129] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and units can refer to the corresponding processes in the foregoing method embodiments, which will not be described here.

[0130] In the several embodiments provided by the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. The division of units is only a logical function division. There can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another device to be installed in a power grid network, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0131] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed to multiple network units. Part or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.

[0132] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0133] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0134] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some technical features; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for real-time calculation of the effective short-circuit ratio, characterized in that, include: Obtain the change in reactive power capacity of the converter before and after the change in the commutation angle in the DC system; Obtain the voltage change value of the AC bus in the converter before and after the change of the commutation angle; Calculate the system short-circuit capacity of the AC system corresponding to the DC system based on the reactive power capacity change value and the voltage change value; Calculate the corresponding effective short-circuit ratio using the system's short-circuit capacity; The voltage change value is: the rate of voltage change; Obtaining the voltage change value of the AC bus in the converter before and after the change in the commutation angle specifically includes: Obtain the first voltage of the AC bus in the converter before the commutation angle changes; Obtain the second voltage of the AC bus after the change in the commutation angle; Based on the first formula, and combining the first voltage and the second voltage, the voltage change rate of the AC bus is calculated, wherein the first formula is: ； In the formula, This represents the rate of change of voltage on the AC bus in the converter before and after the change in commutation angle. The moment after the phase angle change t 2's second voltage, The moment before the phase angle change t The first voltage of 1, It is the average voltage of the voltage level at which the AC bus voltage is located.

2. The real-time calculation method for the effective short-circuit ratio according to claim 1, characterized in that, Obtain the change in reactive power capacity of the converter in the DC system before and after the change in commutation angle, specifically including: Obtain the first reactive power capacity of the converter before the commutation angle changes in the DC system; The second reactive power capacity of the converter is obtained after the change in the commutation angle. By combining the first reactive capacity and the second reactive capacity, the change in reactive capacity of the converter before and after the change in commutation angle is calculated.

3. The real-time calculation method for the effective short-circuit ratio according to claim 2, characterized in that, The first reactive power capacity of the converter before the commutation angle change in the DC system is obtained, specifically including: Before the commutation angle of the converter in the DC system changes, the first commutation overlap angle and the first converter power factor angle are obtained. The first reactive power capacity is calculated based on the first commutation overlap angle and the first converter power factor angle.

4. The real-time calculation method for the effective short-circuit ratio according to claim 2, characterized in that, The second reactive power capacity of the converter after obtaining the change in the commutation angle specifically includes: After obtaining the change in the commutation angle, the second commutation overlap angle and the second converter power factor angle of the converter; The second reactive power capacity is calculated based on the second commutation overlap angle and the second converter power factor angle.

5. The real-time calculation method for the effective short-circuit ratio according to claim 1, characterized in that, Based on the reactive power capacity change value and the voltage change value, the system short-circuit capacity of the corresponding AC system for the DC system is calculated, specifically including: Based on the second formula, the system short-circuit capacity of the AC system corresponding to the DC system is calculated according to the reactive power capacity change value and the voltage change value, wherein the second formula is: ； In the formula, For the system short-circuit capacity of the AC system, This represents the change in reactive power capacity of the converter before and after the change in the commutation angle in the DC system.

6. The real-time calculation method for the effective short-circuit ratio according to claim 1, characterized in that, When the converter is operating in converter mode, the commutation angle is the firing angle in the converter; When the converter is operating in inverter mode, the commutation angle is the arc extinction angle in the converter.

7. A real-time calculation device for the effective short-circuit ratio, characterized in that, include: The first acquisition unit is used to acquire the change in reactive power capacity of the converter before and after the change in the commutation angle of the converter in the DC system. The second acquisition unit is used to acquire the voltage change value of the AC bus in the converter before and after the change of the commutation angle. The first calculation unit is used to calculate the system short-circuit capacity of the AC system corresponding to the DC system based on the reactive power capacity change value and the voltage change value. The second calculation unit is used to calculate the corresponding effective short-circuit ratio using the system's short-circuit capacity; The voltage change value is: the rate of voltage change; Obtaining the voltage change value of the AC bus in the converter before and after the change in the commutation angle specifically includes: Obtain the first voltage of the AC bus in the converter before the commutation angle changes; Obtain the second voltage of the AC bus after the change in the commutation angle; Based on the first formula, and combining the first voltage and the second voltage, the voltage change rate of the AC bus is calculated, wherein the first formula is: ； In the formula, This represents the rate of change of voltage on the AC bus in the converter before and after the change in commutation angle. The moment after the phase angle change t 2's second voltage, The moment before the phase angle change t The first voltage of 1, It is the average voltage of the voltage level at which the AC bus voltage is located.

8. A real-time calculation device for the effective short-circuit ratio, characterized in that, Including the processor and memory; The memory is used to store program code and transmit the program code to the processor; The processor is configured to execute the real-time calculation method for the effective short-circuit ratio according to any one of claims 1 to 6, based on the instructions in the program code.

9. A storage medium, characterized in that, The storage medium is used to store program code, which is used to execute the real-time calculation method for the effective short-circuit ratio according to any one of claims 1 to 6.

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