Power system and power system frequency quantity protection method

Abstract

The application provides a power system and a power system frequency quantity protection method. The power system comprises a first system, a second system, a frequency conversion device and a first frequency quantity measurement device. The first end of the first system is connected with the first end of the frequency conversion device. The first end of the second system is connected with the second end of the frequency conversion device. The first frequency quantity measurement device is connected between the first system and the frequency conversion device. Through the application, the frequency quantity is detected and the system is protected, so that the normal operation of the power system is avoided from being harmed by the frequency quantity leakage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission, in particular to a power system and a power system frequency quantity protection method. BACKGROUND

[0002] AC power transmission has the characteristics of current zero-crossing breaking and electromagnetic induction voltage transformation, and is easy to be used in large-scale networking and voltage level transformation, but in the case of long-distance power transmission, the power frequency AC transmission voltage deviation and loss are large, and the skin effect is obvious in the case of long cable line. DC power transmission is not constrained by line reactance and is suitable for long-distance and large-capacity power transmission, but there are problems such as fault current breaking and DC voltage transformation. Selecting a suitable transmission frequency between DC and power frequency can not only reduce the influence of line impedance on power transmission, but also retain the characteristics of electromagnetic induction voltage transformation and current zero-crossing breaking of AC power transmission. This low-frequency AC power transmission will be a useful supplement to power frequency AC and DC power transmission in long cable line power transmission, power grid flexible interconnection and large-scale new energy collection scenarios.

[0003] However, in the power transmission system using low-frequency AC and power frequency AC combination, when the low-frequency system fails, the low-frequency component passes through the converter to the power frequency side, thereby causing the protection of the original power frequency system to malfunction or refuse to act. Similarly, when the power frequency system fails, the power frequency component passes through the converter to the low frequency side, thereby causing the protection of the original low frequency system to malfunction or refuse to act, affecting the stable operation of the power transmission system. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defect that the leakage of frequency quantity in the prior art affects the stable operation of the power transmission system, thereby providing a power system and a power system frequency quantity protection method.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] In a first aspect, the present application provides a power system, comprising: a first system, a second system, a frequency conversion device and a first frequency quantity measurement device, wherein a first end of the first system is connected to a first end of the frequency conversion device; a first end of the second system is connected to a second end of the frequency conversion device; and the first frequency quantity measurement device is connected between the first system and the frequency conversion device.

[0007] Optionally, the power system further comprises a second frequency quantity measurement device, which is arranged between the second system and the frequency conversion device.

[0008] Optionally, the power system further comprises: a first transformer and a second transformer, wherein a first end of the first transformer is connected to a first end of the frequency conversion device, and a second end of the first transformer is connected to a first end of the first system; a first end of the second transformer is connected to a second end of the frequency conversion device, and a second end of the second transformer is connected to a first end of the second system; a first hetero-frequency quantity measuring device is connected between the first transformer and the frequency conversion device; and a second hetero-frequency quantity measuring device is connected between the second transformer and the frequency conversion device.

[0009] Optionally, the first hetero-frequency quantity measuring device is configured to detect a hetero-frequency quantity leaked by the second system.

[0010] Optionally, the second hetero-frequency quantity measuring device is configured to detect a hetero-frequency quantity leaked by the first system.

[0011] Optionally, the first system operates at a first system frequency from the first end of the frequency conversion device to the first end of the first transformer, and the second system operates at a second system frequency from the second end of the frequency conversion device to the second end of the second transformer, wherein the second system frequency is different from the first system frequency.

[0012] Optionally, the power system further comprises: a first circuit breaker and a second circuit breaker, wherein the first circuit breaker is arranged between the first system and the first transformer, and the second circuit breaker is arranged between the second system and the second transformer.

[0013] In a second aspect, an embodiment of the present application provides a power system hetero-frequency quantity protection method, applied to the power system of the first aspect of the present application, and the power system hetero-frequency quantity protection method comprises the following steps: obtaining a hetero-frequency quantity leaked by a second system and monitored by a first hetero-frequency quantity measuring device; and performing an alarm or controlling an operation state of a frequency conversion device according to the hetero-frequency quantity leaked by the second system.

[0014] Optionally, a hetero-frequency quantity leaked by a first system and monitored by a second hetero-frequency quantity measuring device is obtained; and an alarm or a control of an operation state of the frequency conversion device is performed according to the hetero-frequency quantity leaked by the first system and / or the hetero-frequency quantity leaked by the second system.

[0015] Optionally, the alarm or the control of the operation state of the frequency conversion device according to the hetero-frequency quantity leaked by the first system and / or the hetero-frequency quantity leaked by the second system comprises: starting a timer when the hetero-frequency quantity leaked by the first system and / or the hetero-frequency quantity leaked by the second system exceeds a preset hetero-frequency quantity threshold value, and performing an alarm or adjusting the operation state of the frequency conversion device when a preset timer time is reached.

[0016] Optionally, when the first system leaked inter-frequency amount or / and the second system leaked inter-frequency amount exceeds the preset inter-frequency amount threshold, the timing is started, and when the preset timing time is reached, the operation state of the frequency conversion device is adjusted or an alarm is given, including: when the first system leaked inter-frequency amount or / and the second system leaked inter-frequency amount still exceeds the preset inter-frequency amount threshold after the first preset timing time is reached, the power system is alarmed.

[0017] Optionally, when the first system leaked inter-frequency amount or / and the second system leaked inter-frequency amount still exceeds the preset inter-frequency amount threshold after the second preset timing time is reached, the frequency conversion device is controlled to be locked, and the second preset timing time is greater than the first preset timing time.

[0018] In a third aspect, an embodiment of the present application provides a computer readable storage medium, which stores computer instructions, and the computer instructions are used to make the computer execute the power system inter-frequency amount protection method in the second aspect of the present application.

[0019] In a fourth aspect, an embodiment of the present application provides a computer device, which comprises a memory and a processor, the memory and the processor are connected with each other in communication, the memory stores computer instructions, and the processor executes the computer instructions to execute the power system inter-frequency amount protection method in the second aspect of the present application.

[0020] The technical scheme of the present application has the following advantages:

[0021] The power system provided by the present application comprises a first system, a second system, a frequency conversion device and a first inter-frequency amount measuring device, wherein the first end of the first system is connected with the first end of the frequency conversion device, the first end of the second system is connected with the second end of the frequency conversion device, and the first inter-frequency amount measuring device is connected between the first system and the frequency conversion device. The first inter-frequency amount measuring device is arranged on the connecting line between the first system and the frequency conversion device. The inter-frequency amount measuring device is used to detect the leaked inter-frequency amount between the first system and the second system. Whether the inter-frequency amount between the first system and the second system is leaked is judged according to the inter-frequency amount fed back by the inter-frequency amount measuring device, and the operation state of the frequency conversion device is controlled according to the inter-frequency amount, so that the inter-frequency amount is eliminated, and the normal operation of the power system is avoided from being harmed by the inter-frequency amount leakage.

[0022] The power system frequency quantity protection method provided by the application comprises the following steps: obtaining the second system leakage frequency quantity monitored by a first frequency quantity measuring device; and alarming or controlling the operation state of a frequency conversion device according to the second system leakage frequency quantity. The frequency quantity measuring device is used to detect the leakage frequency quantity between the first system and the second system. The leakage frequency quantity between the first system and the second system is determined according to the feedback frequency quantity of the frequency quantity measuring device, and the operation state of the frequency conversion device is controlled when the leakage frequency quantity exists, so as to eliminate the leakage frequency quantity and avoid the leakage frequency quantity from damaging the normal operation of the power system. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The principle block diagram of a specific example of the power system in the embodiments of the present application;

[0025] Figure 2 The flow chart of a specific example of the power system frequency quantity protection method in the embodiments of the present application;

[0026] Figure 3 The composition diagram of a specific example of the computer device provided in the present application. EMBODIMENT

[0027] The technical solutions of the present application will be described in detail below with reference to the drawings. Obviously, the described embodiments are some of the embodiments of the present application, not all the 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.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection" should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can also be the internal communication of two elements, can be wireless connection, or wired connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the application described below can be combined with each other as long as there is no conflict between them.

[0031] The embodiment of the present application provides a power system, such as Figure 1 As shown in the figure, the above-mentioned power system comprises: a first system, a second system, a frequency conversion device, a first hetero-frequency quantity measuring device, a second hetero-frequency quantity measuring device, a first transformer T1 and a second transformer T2. Wherein, the first end of the first system is connected with the first end of the frequency conversion device through the first transformer T1. The first end of the second system is connected with the second end of the frequency conversion device through the second transformer T2. The first hetero-frequency quantity measuring device is connected between the first transformer T1 and the frequency conversion device. The first hetero-frequency quantity measuring device is used for detecting the hetero-frequency quantity leaked by the second system. The second hetero-frequency quantity measuring device is connected between the second transformer T2 and the frequency conversion device. The second hetero-frequency quantity measuring device is used for detecting the hetero-frequency quantity leaked by the first system.

[0032] In a specific embodiment, as Figure 1 As shown in the figure, the power system further comprises: a first circuit breaker QF1 and a second circuit breaker QF2, the first circuit breaker QF1 is arranged between the first system and the first transformer T1, and the second circuit breaker QF2 is arranged between the second system and the second transformer T2.

[0033] In the embodiment of the present application, the first end of the first system is connected with the first end of the frequency conversion device through the circuit breaker QF1 and the transformer T1 in sequence, and the first end of the second system is connected with the second end of the frequency conversion device through the circuit breaker QF2 and the transformer T2 in sequence. The first hetero-frequency quantity measuring device is connected between the transformer T1 and the frequency conversion device. The second hetero-frequency quantity measuring device is connected between the transformer T2 and the frequency conversion device. In the embodiment of the present application, the first hetero-frequency quantity measuring device between the first system and the frequency conversion device detects the electrical quantity of the second system frequency (such as the voltage or current of the second system frequency). The second hetero-frequency quantity measuring device between the second system and the frequency conversion device detects the electrical quantity of the first system frequency (such as the voltage or current of the first system frequency). The frequency conversion device can be an AC-AC converter.

[0034] Specifically, the first end of the first system to the first end of the frequency conversion device operates at a first system frequency, the second end of the frequency conversion device to the second system operates at a second system frequency, and the second system frequency is different from the first system frequency. In the embodiment of the present application, the frequency value of the second system frequency is not specifically limited from the first system frequency.

[0035] When the second system fails or is in a transient state such as system imbalance, the second system frequency component (voltage and current) will pass through the frequency conversion device to the first system, thereby causing the protection of the first system to malfunction or refuse to act. Taking a side (left side) converter station as an example, when a single-phase ground fault or a transient state such as system imbalance occurs on the second system side, the fault current (voltage) of the second system frequency component will pass through the frequency conversion device to the first system side, and the frequency component will be collected through the first frequency component measuring device. The transient electrical quantity caused by the fault will not generally affect the normal operation of the power system, because the original protection (under-voltage differential protection, over-current protection, zero sequence protection) will normally act to eliminate the fault. The focus is on the transient electrical quantity caused by non-faults, such as temporary faults of the module, loss of trigger signal, etc. Non-line faults, the transient electrical quantity generated will pass to the frequency side, affecting the normal operation of the power system and hindering the normal action of the original protection. Therefore, the first frequency component measuring device between the first system and the frequency conversion device is needed to detect the frequency component leaked from the second system to the first system. The operation state of the frequency conversion device is controlled based on the frequency component measured by the frequency component measuring device, the frequency component is eliminated, and the frequency component is avoided to affect the normal operation of the power system.

[0036] Similarly, when a single-phase ground fault or a transient state such as system imbalance occurs on the first system side, the fault current (voltage) of the first system frequency component will pass through the frequency conversion device to the second system. At this time, the second frequency component measuring device between the second system and the AC / AC converter is needed to detect the frequency component leaked from the first system to the second system. The operation state of the frequency conversion device is controlled based on the frequency component measured by the frequency component measuring device, the frequency component is eliminated, and the frequency component is avoided to affect the normal operation of the power system.

[0037] The power system provided by the present application comprises: a first system, a second system, a frequency conversion device and a first frequency component measuring device, wherein the first end of the first system is connected with the first end of the frequency conversion device; the first end of the second system is connected with the second end of the frequency conversion device; and the first frequency component measuring device is connected between the first system and the frequency conversion device. The first frequency component measuring device is arranged on the connection line between the first system and the frequency conversion device. The frequency component leaked between the first system and the second system is detected by the frequency component measuring device. Whether there is frequency component leakage between the first system and the second system is determined according to the frequency component fed back by the frequency component measuring device, and the operation state of the frequency conversion device is controlled when the frequency component leaks, thereby eliminating the frequency component and avoiding the frequency component from endangering the normal operation of the power system.

[0038] The embodiment of the present invention provides a method for protecting the power system from frequency fluctuations, which is applied to the above power system. Figure 2 As shown, the power system frequency-variable protection method includes the following steps:

[0039] Step S1: Obtain the inter-frequency amount of the second system leaked by the first inter-frequency amount measuring device. In a specific embodiment, Figure 1 As shown, the first frequency deviation measurement device is provided between the transformer T1 and the frequency conversion device. The external control device is connected to the first frequency deviation measurement device to obtain the frequency deviation amount of the second system leakage detected by the first frequency deviation measurement device.

[0040] Step S2: obtaining the inter-frequency amount of the first system leaked by the second inter-frequency amount measuring device.

[0041] In a specific embodiment, if Figure 1 As shown, the second frequency deviation measurement device is provided between the transformer T2 and the frequency conversion device. The external control device is connected to the second frequency deviation measurement device to obtain the frequency deviation amount of the first system leakage detected by the second frequency deviation measurement device.

[0042] Step S3: issuing an alarm or controlling the operating state of the frequency conversion device according to the out-of-frequency amount leaked from the first system and / or the out-of-frequency amount leaked from the second system.

[0043] In a specific embodiment, an alarm is issued or the operating state of the frequency conversion device is controlled based on the heterofrequency amount leaked from the first system or / and the heterofrequency amount leaked from the second system, including: starting a timer when the heterofrequency amount leaked from the first system or / and the heterofrequency amount leaked from the second system exceeds a preset heterofrequency amount threshold, and issuing an alarm or adjusting the operating state of the frequency conversion device when the preset timer time is reached.

[0044] In an embodiment of the present invention, when the amount of inter-frequency leakage of the first system and / or the amount of inter-frequency leakage of the second system exceeds a preset inter-frequency threshold, a timer is started, and when the preset timer time is reached, an alarm is issued or the operating state of the frequency conversion device is adjusted, including:

[0045] Step S31: When the first preset timing time is reached and the frequency deviation amount leaked from the first system and / or the frequency deviation amount leaked from the second system still exceeds the preset frequency deviation amount threshold, an alarm is issued to the power system.

[0046] Step S32: When the second preset timing time is reached and the frequency deviation amount of the first system leakage and / or the frequency deviation amount of the second system leakage still exceeds the preset frequency deviation threshold, the frequency conversion device is controlled to be locked, and the second preset timing time is greater than the first preset timing time.

[0047] Specifically, if Figure 1As shown, taking the converter station on one side (left side) as an example, when the second system fails or the system is unbalanced or in a transient steady-state condition, the frequency component (voltage and current) of the second system will pass through the frequency conversion device to the first system. The second system frequency component will be regarded as an out-of-frequency quantity by the first system, and the out-of-frequency quantity will be collected by the first out-of-frequency quantity measuring device.

[0048] Furthermore, when the amount of inter-frequency leakage detected by the first inter-frequency measurement device exceeds a preset inter-frequency threshold, a timer is started. If the amount of inter-frequency leakage from the second system still exceeds the preset inter-frequency threshold after the first preset timer expires, an alarm is issued to the power system. If the amount of inter-frequency leakage from the second system still exceeds the preset inter-frequency threshold after the second preset timer expires, the frequency converter is controlled to shut down.

[0049] Similarly, when the first system fails or experiences a transient steady-state condition such as system imbalance, the frequency component (voltage and current) of the first system will pass through the frequency conversion device to the second system. The first system frequency will be regarded as an out-of-frequency quantity by the second system, and the out-of-frequency quantity will be collected by the second out-of-frequency quantity measurement device.

[0050] Furthermore, when the amount of inter-frequency leakage detected by the second inter-frequency measurement device exceeds a preset inter-frequency threshold, a timer is started. If the amount of inter-frequency leakage from the first system still exceeds the preset inter-frequency threshold after the first preset timer expires, an alarm is issued to the power system. If the amount of inter-frequency leakage from the first system still exceeds the preset inter-frequency threshold after the second preset timer expires, the frequency conversion device is controlled to lock. In this embodiment of the present invention, the second preset timer and the first preset timer can be adjusted according to actual needs.

[0051] The present invention provides a method for protecting power system inter-frequency quantity, including: obtaining inter-frequency quantity leakage from a second system as monitored by a first inter-frequency quantity measuring device; and issuing an alarm or controlling the operating status of a frequency converter based on the inter-frequency quantity leakage from the second system. The inter-frequency quantity measuring device is used to detect inter-frequency quantity leakage between the first and second systems. Based on the inter-frequency quantity feedback from the inter-frequency quantity measuring device, it is determined whether inter-frequency quantity leakage exists between the first and second systems. If inter-frequency quantity leakage occurs, the operating status of the frequency converter is controlled to eliminate the inter-frequency quantity leakage, thereby preventing the inter-frequency quantity leakage from endangering the normal operation of the power system.

[0052] The embodiment of the present invention also provides a computer device, such as Figure 3 As shown, the device terminal may include a processor 61 and a memory 62, wherein the processor 61 and the memory 62 may be connected via a bus or other means. Figure 3 The bus connection is taken as an example.

[0053] The processor 61 may be a central processing unit (CPU). The processor 61 may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0054] Memory 62, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions / modules in the embodiments of the present invention. Processor 61 executes the non-transitory software programs, instructions, and modules stored in memory 62 to perform various processor functions and data processing, thereby implementing the power system inter-frequency protection method in the above-mentioned method embodiment.

[0055] The memory 62 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created by the processor 61, etc. In addition, the memory 62 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 62 may optionally include a memory remotely located relative to the processor 61, and these remote memories may be connected to the processor 61 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.

[0056] One or more modules are stored in the memory 62 , and when executed by the processor 61 , the power system frequency-variable protection method of the embodiment is executed.

[0057] The specific details of the above-mentioned computer device can be understood by referring to the corresponding descriptions and effects in the embodiments, and will not be repeated here.

[0058] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The program can be stored in a computer readable storage medium. When the program is executed, it can include the processes of the above-mentioned embodiment methods. The storage medium can be a magnetic disc, an optical disc, a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD), etc. The storage medium can also include a combination of the above-mentioned types of memories.

[0059] Obviously, the above-mentioned embodiments are only examples for clearly illustrating but not limiting the embodiments. Based on the above-mentioned description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments do not need to be exhausted and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A power system, characterized in that: include: The first system, the second system, the frequency conversion device and the first frequency difference measurement device, wherein: The first end of the first system is connected to the first end of the frequency conversion device; The first end of the second system is connected to the second end of the frequency conversion device; A first frequency difference measurement device is connected between the first system and the frequency conversion device; The device further includes: a second frequency difference measurement device, the second frequency difference measurement device being arranged between the second system and the frequency conversion device; Obtaining the inter-frequency amount of leakage of the second system monitored by the first inter-frequency amount measuring device; Prompt an alarm or control the operating state of the frequency conversion device according to the frequency deviation amount leaked from the second system; obtaining an out-of-frequency amount of the first system leaked by a second out-of-frequency amount measuring device; Prompt an alarm or control the operating state of the frequency conversion device according to the frequency deviation amount leaked from the first system and / or the frequency deviation amount leaked from the second system; The step of issuing an alarm or controlling the operating state of the frequency converter according to the out-of-frequency amount leaked from the first system and / or the out-of-frequency amount leaked from the second system includes: When the out-of-frequency amount leaked by the first system or / and the out-of-frequency amount leaked by the second system exceeds a preset out-of-frequency amount threshold, a timer is started, and when the preset timer time is reached, an alarm is issued or the operating state of the frequency conversion device is adjusted; When the out-of-frequency amount leaked by the first system or / and the out-of-frequency amount leaked by the second system exceeds a preset out-of-frequency amount threshold, a timer is started, and when the preset timer time is reached, an alarm is issued or the operating state of the frequency conversion device is adjusted, including: When the first preset timing time is reached and the frequency difference amount leaked by the first system or / and the frequency difference amount leaked by the second system still exceeds the preset frequency difference amount threshold, an alarm is issued to the power system; When the second preset timing time is reached and the frequency deviation amount leaked by the first system or / and the frequency deviation amount leaked by the second system still exceeds the preset frequency deviation threshold, the frequency conversion device is controlled to be locked, and the second preset timing time is greater than the first preset timing time.

2. The power system according to claim 1, characterized in that Also includes: The first transformer and the second transformer, wherein The first end of the first transformer is connected to the first end of the frequency conversion device, and the second end of the first transformer is connected to the first end of the first system; The first end of the second transformer is connected to the second end of the frequency conversion device, and the second end of the second transformer is connected to the first end of the second system; A first frequency difference measurement device is connected between the first transformer and the frequency conversion device; A second frequency difference measurement device is connected between the second transformer and the frequency conversion device.

3. The power system according to claim 1, characterized in that The first out-of-frequency amount measuring device is used to detect the out-of-frequency amount leaked from the second system.

4. The power system according to claim 1, characterized in that The second frequency-interference amount measuring device is used to detect the frequency-interference amount leaked from the first system.

5. The power system according to claim 1, characterized in that The first end from the first system to the frequency conversion device operates at a first system frequency, and the second end from the frequency conversion device to the second system operates at a second system frequency, which is different from the first system frequency.

6. The power system according to claim 2, characterized in that Also includes: A first circuit breaker and a second circuit breaker, wherein the first circuit breaker is arranged between the first system and the first transformer, and the second circuit breaker is arranged between the second system and the second transformer.

7. A method for protecting power system frequency fluctuations, characterized in that: Applied to the power system according to any one of claims 1 to 6, the power system out-of-frequency protection method comprises: Obtaining the inter-frequency amount of leakage of the second system monitored by the first inter-frequency amount measuring device; Prompt an alarm or control the operating state of the frequency conversion device according to the frequency deviation amount leaked from the second system; obtaining an out-of-frequency amount of the first system leaked by a second out-of-frequency amount measuring device; Prompt an alarm or control the operating state of the frequency conversion device according to the frequency deviation amount leaked from the first system and / or the frequency deviation amount leaked from the second system; The step of issuing an alarm or controlling the operating state of the frequency converter according to the out-of-frequency amount leaked from the first system and / or the out-of-frequency amount leaked from the second system includes: When the out-of-frequency amount leaked by the first system or / and the out-of-frequency amount leaked by the second system exceeds a preset out-of-frequency amount threshold, a timer is started, and when the preset timer time is reached, an alarm is issued or the operating state of the frequency conversion device is adjusted; When the out-of-frequency amount leaked by the first system or / and the out-of-frequency amount leaked by the second system exceeds a preset out-of-frequency amount threshold, a timer is started, and when the preset timer time is reached, an alarm is issued or the operating state of the frequency conversion device is adjusted, including: When the first preset timing time is reached and the frequency difference amount leaked by the first system or / and the frequency difference amount leaked by the second system still exceeds the preset frequency difference amount threshold, an alarm is issued to the power system; When the second preset timing time is reached and the frequency deviation amount leaked by the first system or / and the frequency deviation amount leaked by the second system still exceeds the preset frequency deviation threshold, the frequency conversion device is controlled to be locked, and the second preset timing time is greater than the first preset timing time.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the power system inter-frequency protection method according to claim 7.

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 power system frequency-variable protection method according to claim 7 by executing the computer instructions.

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