Voltage tracking method, control device, ups system

Abstract

The application provides a voltage tracking method, a control device and a UPS system. The method is used for tracking grid voltage. The method performs the following steps in each capture cycle: obtaining a captured current voltage cycle; if a target cycle is stored in a preset storage space, adding the current voltage cycle to the target cycle to obtain a first voltage cycle; if the first voltage cycle is not in a preset range, performing an abnormal number count; if the abnormal number does not exceed a preset number, tracking voltage according to a voltage cycle used in voltage tracking of a last capture cycle; and if the abnormal number exceeds the preset number, stopping voltage tracking of the grid voltage. The application considers the influence of grid harmonics and can effectively realize grid voltage tracking. On this basis, the application can be effectively applied to the nuclear power field, effectively ensures stable operation of electrical equipment for nuclear power, and further ensures stable operation of a nuclear power system.

Description

Technical Field

[0001] The present invention belongs to the field of circuit technology, and more specifically, relates to a voltage tracking method, a control device, and a UPS system. Background Art

[0002] In the circuit field, there are many scenarios requiring grid voltage tracking. In existing technologies, when tracking grid voltage, to prevent errors in capturing the grid voltage cycle or abnormalities in the grid voltage itself, which could affect subsequent circuit control and, in turn, normal circuit operation, the captured grid voltage cycle is typically verified. If verification is successful, voltage tracking is performed based on the acquired grid voltage cycle. If an abnormality is detected in the grid voltage cycle, tracking is stopped.

[0003] Based on this, the inventors of this application considered that the power grid will have a certain amount of harmonics. When the amount of grid harmonics is large, it may cause anomalies in the captured grid voltage cycle. However, the existing technology stops tracking the grid voltage when an anomaly is detected in the grid voltage cycle. In other words, once the amount of grid harmonics is large, the existing technology stops tracking the grid voltage. This approach is obviously not conducive to the implementation of voltage tracking. Summary of the Invention

[0004] The purpose of the present invention is to provide a voltage tracking method, a control device, and a UPS system to solve the technical problem in the prior art that when the amount of grid harmonics is large, grid voltage tracking stops, which is not conducive to grid voltage tracking.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide a voltage tracking method, which is used to track the grid voltage. The voltage tracking method performs the following steps in each capture cycle:

[0006] Get the captured current voltage cycle;

[0007] Detecting whether a target cycle is stored in a preset storage space; if the target cycle is not stored in the preset storage space, using the current voltage cycle as the first voltage cycle; if the target cycle is stored in the preset storage space, adding the current voltage cycle to the target cycle to obtain the first voltage cycle;

[0008] If the first voltage cycle is within a preset range, voltage tracking is performed using the first voltage cycle, and the number of abnormalities is set to zero if it is not zero, and the preset storage space is cleared if it is not empty; wherein the number of abnormalities refers to the number of abnormalities in the first voltage cycle;

[0009] If the first voltage period is not in the preset range, an abnormal number of times is counted once, and it is judged whether the abnormal number of times exceeds a preset number of times; if the abnormal number of times does not exceed the preset number of times, voltage tracking is performed according to a voltage period used in voltage tracking in a last capture period, and a target period stored in a preset storage space is replaced by the first voltage period; if the abnormal number of times exceeds the preset number of times, it is judged that the period of the grid voltage is abnormal, and voltage tracking of the grid voltage is stopped.

[0010] In a possible implementation, before the current voltage period captured is acquired, the voltage tracking method further includes:

[0011] Acquiring a square wave signal sent by a target conditioning circuit; wherein the target conditioning circuit is configured to convert a grid voltage signal into a square wave signal;

[0012] Capturing an edge of the square wave signal;

[0013] Determining the current voltage period captured according to a time difference between a first time and a second time;

[0014] The first time is a time at which the edge of the square wave signal is captured in a current capture period, and the second time is a time at which the edge of the square wave signal is captured in a last capture period.

[0015] In a possible implementation, the properties of the edges of the square wave signal captured in each capture period are consistent, and the determining of the current voltage period captured according to the time difference between the first time and the second time includes:

[0016] The time difference between the first time and the second time is determined as the current voltage period captured.

[0017] In a possible implementation, the properties of the edges of the square wave signal captured in each adjacent two capture periods are inconsistent, and the determining of the current voltage period captured according to the time difference between the first time and the second time includes:

[0018] The double of the time difference between the first time and the second time is determined as the current voltage period captured.

[0019] In a possible implementation, the voltage tracking method further includes: determining the preset number of times; and the determining of the preset number of times includes:

[0020] Acquiring a harmonic quantity of the grid voltage according to a preset time interval;

[0021] Determining the preset number of times according to the harmonic quantity, and the preset number of times is positively correlated with the harmonic quantity.

[0022] In a possible implementation, the determining the preset number of times according to the harmonic quantity comprises:

[0023] obtaining a linear relationship between the preset number of times and the harmonic quantity in advance;

[0024] determining the preset number of times corresponding to the current obtained harmonic quantity according to the linear relationship.

[0025] In a possible implementation, the voltage tracking method further comprises: determining the preset number of times; and the determining the preset number of times comprises:

[0026] determining a preset time period to which a current time point belongs;

[0027] determining the preset number of times corresponding to the current time point according to the preset time period to which the current time point belongs.

[0028] In a possible implementation, before the determining the preset number of times, the voltage tracking method further comprises:

[0029] obtaining a harmonic quantity of a grid voltage;

[0030] dividing each day into a plurality of preset time periods according to the size of the harmonic quantity, and determining preset numbers of times corresponding to the plurality of preset time periods.

[0031] Another aspect of the present application also provides a control device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the voltage tracking method described above when executing the computer program.

[0032] Still another aspect of the present application also provides a UPS system comprising:

[0033] the control device described above.

[0034] The voltage tracking method, the control device, and the UPS system provided by the present application have the following advantages:

[0035] Distinguishing from the prior art, when the first voltage period is judged to be out of the preset range, the application first counts the number of abnormal voltage periods, instead of directly stopping tracking the grid voltage, which can effectively avoid the influence of grid harmonics on grid voltage tracking, and ensure the effective performance of grid voltage tracking. On this basis, when the first voltage period is judged to be out of the preset range, the application will use the voltage period used in the last capture period for voltage tracking to ensure the accuracy of voltage tracking and avoid affecting the subsequent circuit control and circuit operation. Moreover, as can be seen from the overall scheme of the application, when the first voltage period is abnormal and the number of abnormal first voltage periods does not exceed the preset number, the application will accumulate the captured voltage period, which can ensure accurate grid voltage period without stopping voltage tracking, and also ensure that the period corresponding to the grid harmonics is included when calculating the actual period of the grid voltage, so as to obtain an accurate grid voltage period. From this point of view, the application also improves the accuracy of grid voltage tracking. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0037] Figure 1 The flowchart of the voltage tracking method provided by an embodiment of the application;

[0038] Figure 2 The square wave diagram corresponding to the grid voltage when the grid has harmonics provided by an embodiment of the application;

[0039] Figure 3 The structural diagram of the control device provided by an embodiment of the application. DETAILED DESCRIPTION

[0040] In order to make the technical problems to be solved by the application, technical solutions and beneficial effects more clearly understood, the following will further describe the application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

[0041] The application will be further described in detail below in combination with the drawings and specific embodiments.

[0042] Please refer to Figure 1 , Figure 1A flowchart of a voltage tracking method provided by an embodiment of the present application is shown in FIG. 1. The voltage tracking method is used to track grid voltage and is applicable to any scenario of tracking grid voltage. For example, the voltage tracking method can be used when an inverter circuit tracks bypass voltage in a UPS system.

[0043] The voltage tracking method provided by the embodiment of the present application performs the following steps in each capture cycle:

[0044] S101: Obtain a current voltage cycle captured.

[0045] S102: Detect whether a target cycle is stored in a preset storage space. If the target cycle is not stored in the preset storage space, the current voltage cycle is taken as a first voltage cycle. If the target cycle is stored in the preset storage space, the current voltage cycle is added to the target cycle to obtain the first voltage cycle.

[0046] S103: If the first voltage cycle is within a preset range, voltage tracking is performed using the first voltage cycle, the number of exceptions is set to zero when the number of exceptions is not zero, and the preset storage space is emptied when the preset storage space is not empty. The number of exceptions refers to the number of exceptions of the first voltage cycle.

[0047] S104: If the first voltage cycle is not within the preset range, the number of exceptions is counted once, and it is determined whether the number of exceptions exceeds a preset number. If the number of exceptions does not exceed the preset number, voltage tracking is performed using a voltage cycle used in voltage tracking in a previous capture cycle, and the target cycle stored in the preset storage space is replaced by the first voltage cycle. If the number of exceptions exceeds the preset number, it is determined that the cycle of the grid voltage is abnormal, and voltage tracking of the grid voltage is stopped.

[0048] In the embodiment, the current voltage cycle is the grid voltage cycle captured in the current capture cycle. On this basis, steps S102-S104 make a series of determinations to determine whether to directly use the current voltage cycle for voltage tracking.

[0049] In the embodiment, if the first voltage cycle is not within the preset range, it means that the first voltage cycle is abnormal. Considering the influence of harmonics, voltage tracking of the grid voltage is not stopped at this time, but the number of voltage cycle exceptions is counted once. Subsequently, it can be determined whether the grid voltage cycle is really abnormal through accumulation of the count value.

[0050] In the embodiment, if the first voltage period is not in the preset range and the number of abnormalities does not exceed the preset number, it indicates that the current voltage period captured can be the period corresponding to the harmonic, at this time, in order to determine the accurate grid voltage period, the captured grid voltage period can be continued to be accumulated. In this case, when tracking the voltage, the voltage period used can be the voltage period used in the last capture period, that is, the normal tracking of the grid voltage can be ensured by following the voltage period of the last grid voltage period without abnormality, thereby ensuring the control accuracy of the circuit. The purpose of tracking the grid voltage is usually to control the circuit according to the tracked grid voltage, and the aforementioned circuit refers to the controlled circuit.

[0051] In the embodiment, when the first voltage period is abnormal and the number of abnormalities of the first voltage period does not exceed the preset number, the first voltage period is calculated in an accumulated manner. This manner can also effectively ensure that the grid harmonic influences the capture of the grid voltage period, so that the grid voltage period corresponding to the grid harmonic is calculated, thereby obtaining an accurate grid voltage period. For example, reference can be made to Figure 2 , Figure 2 The schematic diagram of the square wave corresponding to the grid voltage when the grid has a large harmonic, from Figure 2 It can be known that the harmonic period (the period occupied by one harmonic) is also part of the grid voltage period in nature, and in the prior art, in order to avoid the influence of the harmonic, the harmonic period is usually discarded, and the grid voltage period is directly calculated from the falling edge of the harmonic. This manner is obviously not accurate enough, and therefore, the embodiment of the present application can effectively ensure the calculation accuracy of the grid voltage period by using the accumulated manner.

[0052] In the embodiment, if the first voltage period determined by the current capture period is in the preset period range under the condition that the target period is stored in the preset storage space, it indicates that the harmonic period has ended, and the current first voltage period can be used as the actual period of the grid voltage to participate in subsequent voltage tracking. On this basis, in order to avoid unlimited accumulation of the voltage period, the number of abnormalities of the voltage period can be reset to zero and the preset storage space can be emptied, so as to ensure the calculation accuracy of the actual period of the grid voltage.

[0053] In the embodiment, if the number of abnormalities of the voltage period exceeds the preset number, the present application will determine that the tracked grid voltage itself is abnormal, at this time, the tracking of the grid voltage can be stopped, and a warning can be given.

[0054] In the embodiment, tracking the grid voltage can include tracking the frequency of the grid voltage and tracking the phase of the grid voltage.

[0055] It can be known from the embodiment that, after the first voltage period is determined, three results can be generated according to various criteria. First, the first voltage period is directly taken as the actual period of the grid voltage to track the frequency and phase of the grid voltage. Second, it is determined that the grid voltage period (or the grid voltage frequency) is indeed abnormal, and the tracking of the grid voltage is stopped. Third, it is unable to determine that the grid voltage period is indeed abnormal, and the first voltage period calculated at present is also not the normal grid voltage period. At this time, the accumulation of the grid voltage period can be continued, and the voltage period used in the voltage tracking of the previous capture period is used as the voltage period in the voltage tracking of the current capture period, and then the tracking of the grid voltage frequency and phase is performed.

[0056] As can be known from the above description, unlike the manner in which the tracking of the grid voltage is directly stopped when the grid voltage period is verified to be abnormal in the prior art, the embodiment of the present application first performs the count of the number of times of voltage period abnormalities when it is determined that the first voltage period is not in the preset range, instead of directly stopping the tracking of the grid voltage. This manner can effectively avoid the influence of the grid harmonics on the tracking of the grid voltage, and ensure the effective performance of the tracking of the grid voltage. On this basis, when it is determined that the first voltage period is not in the preset range, the embodiment of the present application uses the voltage period used in the previous capture period to perform the voltage tracking, so as to ensure the accuracy of the voltage tracking, and avoid the influence on the subsequent circuit control and circuit operation. Moreover, as can be known from the overall scheme of the embodiment of the present application, when the first voltage period is abnormal and the number of times of the first voltage period abnormalities does not exceed the preset number of times, the embodiment of the present application performs the accumulation of the captured voltage period. This accumulation manner can ensure the accurate grid voltage period without stopping the voltage tracking, and can ensure that the period corresponding to the grid harmonics is included when the actual period of the grid voltage is calculated, so that the accurate grid voltage period is obtained. From this perspective, the embodiment of the present application also improves the accuracy of the tracking of the grid voltage.

[0057] In a possible implementation manner, before the current voltage period captured is acquired, the voltage tracking method further includes:

[0058] The square wave signal sent by the target conditioning circuit is acquired. The target conditioning circuit is used to convert the grid voltage signal into a square wave signal.

[0059] The edge of the square wave signal is captured.

[0060] The current voltage period captured is determined according to the time difference between the first time and the second time.

[0061] The first time is the time when the edge of the square wave signal is captured in the current capture period, and the second time is the time when the edge of the square wave signal is captured in the previous capture period.

[0062] In the embodiment, the voltage tracking method can further include a process of determining the captured current voltage period. Reference can be made to Figure 2 In the actual determination of the captured current voltage period, the square wave edge corresponding to the grid voltage can be captured by an ECAP module in the relevant control device (i.e. the execution subject of the voltage tracking method provided by the embodiment of the application), and the captured current voltage period can be determined according to the count value of the time reference counter at the time when the ECAP module captures the square wave edge of the grid voltage. That is, the time at which the square wave signal edge is captured in the embodiment of the application can be represented by the count value of the time reference counter in the ECAP module.

[0063] In a possible implementation, the property of the captured square wave signal edge in each capture period is consistent, and the captured current voltage period is determined according to the time difference between the first time and the second time, including:

[0064] The time difference between the first time and the second time is determined as the captured current voltage period.

[0065] In the embodiment, the property of the edge is used to describe whether a certain edge is a rising edge or a falling edge. On this basis, if the edges of the square wave signal captured in each capture period are all rising edges, or the edges of the square wave signal captured in each capture period are all falling edges, the time difference between the first time and the second time can be directly determined as the current voltage period.

[0066] That is, in the embodiment, when the properties of the edges of the square wave signal captured in each capture period are consistent, the difference between the time parameters in the adjacent two capture periods is essentially a grid voltage period.

[0067] In a possible implementation, the property of the square wave signal edge captured in each adjacent two capture periods is inconsistent, and the captured current voltage period is determined according to the time difference between the first time and the second time, including:

[0068] The double of the time difference between the first time and the second time is determined as the captured current voltage period.

[0069] In the embodiment, the property of the edge is used to describe whether a certain edge is a rising edge or a falling edge. On this basis, if the edge of the square wave signal captured in the last capture period is a rising edge, and the edge of the square wave signal captured in the current capture period is a falling edge, the double of the time difference between the first time and the second time is determined as the first voltage period. Or, if the edge of the square wave signal captured in the last capture period is a falling edge, and the edge of the square wave signal captured in the current capture period is a rising edge, the double of the time difference between the first time and the second time is also determined as the current voltage period.

[0070] That is, in the embodiment, when the properties of the edges of the square wave signals captured in the two adjacent capture periods are inconsistent, the difference between the time parameters in the two adjacent capture periods is essentially half of the grid voltage period.

[0071] In a possible implementation, the voltage tracking method further includes determining the preset number of times. Determining the preset number of times includes:

[0072] The harmonic quantity of the grid voltage is obtained according to the preset time interval.

[0073] The preset number of times is determined according to the harmonic quantity, and the preset number of times is positively correlated with the harmonic quantity.

[0074] In the embodiment, the greater the harmonic quantity of the grid voltage is, the more the abnormal times of the first voltage period can be for obtaining a more accurate grid voltage period. Therefore, the embodiment can also obtain the harmonic quantity of the grid voltage according to the preset time interval, and determine the preset number of times according to the harmonic quantity of the grid voltage. That is, the preset number of times can be adjusted according to the preset time interval, so as to ensure the accuracy of the grid voltage tracking.

[0075] In the embodiment, the preset number of times is positively correlated with the harmonic quantity, that is, the greater the harmonic quantity is, the greater the preset number of times is.

[0076] In a possible implementation, the preset number of times is determined according to the harmonic quantity, and the preset number of times is positively correlated with the harmonic quantity.

[0077] A linear relationship between the preset number of times and the harmonic quantity is obtained in advance.

[0078] The preset number of times corresponding to the currently obtained harmonic quantity is determined according to the linear relationship.

[0079] In the embodiment, the linear relationship between the preset number of times and the harmonic quantity can be obtained in advance. When the preset number of times needs to be determined, the preset number of times corresponding to the currently obtained harmonic quantity is determined according to the currently obtained harmonic quantity and the preset linear relationship.

[0080] In a possible implementation, the voltage tracking method further includes determining the preset number of times. Determining the preset number of times includes:

[0081] A preset time period to which the current time belongs is determined.

[0082] The preset number of times corresponding to the current time is determined according to the preset time period to which the current time belongs.

[0083] In a possible implementation, before the preset number of times is determined, the voltage tracking method further includes:

[0084] The harmonic quantity of the grid voltage is obtained.

[0085] According to the size of the harmonic quantity, each day is divided into multiple preset time periods, and the preset number corresponding to the multiple preset time periods is determined.

[0086] In this embodiment, the harmonic quantity of the grid voltage has a time-space feature in some application scenarios. For example, in some production fields, each nonlinear device has a specific working period. In the working period, the access of each nonlinear device to the grid will greatly increase the harmonic quantity. In the non-working period, due to the reduced access of each nonlinear device to the grid, the harmonic quantity will also decrease. Therefore, in this embodiment, a day can be divided into multiple time periods according to the harmonic quantity of the grid voltage in each time period, and a preset number is calibrated for each time period. In the subsequent process of tracking the grid voltage, the preset number is determined according to the preset time period to which the current time belongs. That is, if the current time belongs to a certain preset time period, the preset number corresponding to the preset time period is the preset number corresponding to the current time. This method can effectively ensure the accuracy of the grid voltage tracking.

[0087] Another aspect of the present application, please refer to Figure 3Further provided is a control device 300, comprising one or more processors 301, one or more input devices 302, one or more output devices 303, and one or more memories 304. The processor 301, the input device 302, the output device 303, and the memory 304 communicate with each other through a communication bus 305. The memory 304 is configured to store a computer program, and the computer program comprises program instructions. The processor 301 is configured to execute the program instructions stored in the memory 304. In this embodiment of the present application, the processor 301 can be a central processing unit (CPU). The processor can also be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The input device 302 can include a touchpad, a fingerprint sensor (for collecting fingerprint information and direction information of a fingerprint of a user), a microphone, or the like. The output device 303 can include a display (such as an LCD), a speaker, or the like. The memory 304 can include a read-only memory and a random access memory, and provide instructions and data for the processor 301. A portion of the memory 304 can also include a non-volatile random access memory. For example, the memory 304 can also store device type information. In a specific implementation, the processor 301, the input device 302, and the output device 303 described in the embodiments of the present application can implement the implementation manners described in the first embodiment and the second embodiment of the voltage tracking method provided by the embodiments of the present application.

[0088] In another aspect of the present application, a UPS system is also provided, comprising:

[0089] The control device described above.

[0090] In this embodiment, the grid voltage tracking method described in the above embodiments can be used for the inverter circuit to track the bypass voltage. On this basis, the control device described in the above embodiments can be a control device in the inverter circuit, which is configured to realize that the inverter circuit tracks the frequency and phase of the bypass voltage (i.e., tracks the frequency and phase of the grid voltage).

[0091] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A voltage tracking method, characterized by, The voltage tracking method is used for tracking grid voltage, and the voltage tracking method performs the following steps in each capture cycle: acquire a captured current voltage period; detect whether a target period is stored in a preset storage space; if the target period is not stored in the preset storage space, the current voltage period is taken as a first voltage period; if the target period is stored in the preset storage space, the current voltage period is accumulated on the target period to obtain the first voltage period; if the first voltage period is in a preset range, voltage tracking is performed by using the first voltage period, the abnormal number of times is set to zero when the abnormal number of times is not zero, and the preset storage space is emptied when the preset storage space is not empty; wherein, the abnormal number of times refers to the abnormal number of times of the first voltage period; if the first voltage period is not in the preset range, the abnormal number of times is counted once, and it is judged whether the abnormal number of times exceeds a preset number of times; if the abnormal number of times does not exceed the preset number of times, voltage tracking is performed according to the voltage period used in the last capture cycle voltage tracking, and the target period stored in the preset storage space is replaced by the first voltage period; if the abnormal number of times exceeds the preset number of times, it is judged that the period of the grid voltage is abnormal, and voltage tracking of the grid voltage is stopped; wherein, the method further comprises: determining the preset number of times; the determination of the preset number of times comprises: acquiring a harmonic quantity of the grid voltage according to a preset time interval; determining the preset number of times according to the harmonic quantity, the preset number of times being positively correlated with the harmonic quantity; before determining the preset number of times, the method further comprises: acquiring a harmonic quantity of the grid voltage; dividing each day into a plurality of preset time periods according to the size of the harmonic quantity.

2. The voltage tracking method of claim 1, wherein, Before acquiring the captured current voltage period, the voltage tracking method further comprises: acquiring a square wave signal sent by a target conditioning circuit; wherein, the target conditioning circuit is used for converting a grid voltage signal into a square wave signal; capturing an edge of the square wave signal; determining the captured current voltage period according to a time difference between a first time and a second time; wherein, the first time is a time when the edge of the square wave signal is captured in a current capture cycle, and the second time is a time when the edge of the square wave signal is captured in a last capture cycle.

3. The voltage tracking method of claim 2, wherein, The properties of the edges of the square wave signal captured in each capture cycle are consistent, and the determination of the captured current voltage period according to the time difference between the first time and the second time comprises: determining the time difference between the first time and the second time as the captured current voltage period.

4. The voltage tracking method of claim 2, wherein, The properties of the edges of the square wave signal captured in each adjacent two capture cycles are inconsistent, and the determination of the captured current voltage period according to the time difference between the first time and the second time comprises: determining twice of the time difference between the first time and the second time as the captured current voltage period.

5. The voltage tracking method of claim 1, wherein, The determination of the preset number of times according to the harmonic quantity comprises: acquiring a linear relationship between a preset number of times and a harmonic quantity pre-marked; determining the preset number of times corresponding to the current acquired harmonic quantity according to the linear relationship.

6. The voltage tracking method according to any one of claims 1 to 4, wherein The voltage tracking method further comprises: determining the preset number of times; the determination of the preset number of times comprises: Determining a preset time period to which a current time point belongs; Determining a preset number of times corresponding to the current time point according to the preset time period to which the current time point belongs.

7. The voltage tracking method of claim 6, wherein, After the division of each day into a plurality of preset time periods according to the size of the harmonic quantity, the method further comprises: determining preset numbers of times corresponding to the plurality of preset time periods.

8. A control device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, The processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.

9. A UPS system characterized by, Comprise: The control device of claim 8.

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