Wave-by-wave voltage limiting control method and system of energy storage converter and storage medium

Abstract

The invention provides a wave-by-wave voltage limiting control method and system for an energy storage converter and a storage medium, and the method comprises the steps: obtaining first voltage information according to first period information; secondly, when it is judged that the first voltage information exceeds a preset first voltage threshold value, a wave development switch is switched off; then, first voltage difference value information is obtained according to the first voltage information and a first voltage threshold value; and finally, according to the second voltage information and the first voltage difference information, first time information is determined and is used for timed closing of the wave sending switch. The state of the wave sending switch is updated according to the set detection period, when the voltage is detected to be too large, wave sealing is achieved by disconnecting the wave sending switch, the voltage is effectively controlled, the voltage is prevented from being too large, and the operation safety of the energy storage converter is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage converters, and more specifically, to a wave-by-wave voltage limiting control method, system and storage medium of an energy storage converter. Background Art

[0002] With the rapid development of the energy storage industry, energy storage systems have been increasingly used to improve energy efficiency, reduce electricity costs, provide backup power, and participate in auxiliary services in the electricity market. Among them, the energy storage inverter is used to complete the bidirectional conversion of energy between the battery and the power grid, that is, the bidirectional conversion between direct current and alternating current, and is a key device in the energy storage system. When the energy storage system fails, in order to avoid the energy storage inverter being damaged due to overload of the power module, threatening the safe operation of the entire energy storage system, at present, the wave-by-wave current limiting protection technology is usually used to reduce or disconnect the current of the power module to achieve shutdown protection.

[0003] However, when the power module is charging the battery, if the relay on the battery side is abnormally closed, that is, the relay that should be in the closed state is suddenly disconnected and then quickly closed, the voltage on the power module side will be too large instantly, and the protection technology of wave-by-wave current limiting cannot quickly reduce the above voltage. Therefore, a technology for quickly controlling the output voltage value of the wave-by-wave voltage limiting device of the energy storage converter is urgently needed. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a wave-by-wave voltage limiting control method, system and storage medium of an energy storage inverter, which can obtain the AC input voltage and DC output voltage of the wave-by-wave voltage limiting device of the energy storage inverter according to a preset collection and calculation method; then, when it is judged that voltage limiting protection is needed according to the DC output voltage value, the disconnection time of the wave-generating switch is obtained according to the AC input voltage value and the DC output voltage value, so as to perform timed switching of the state of the wave-generating switch.

[0005] A first aspect of the present invention provides a wave-by-wave voltage limiting control method for an energy storage converter, the method comprising: acquiring first cycle information; Obtaining first voltage information according to the first cycle information; Determining whether the first voltage information exceeds a preset first voltage threshold; If yes, disconnect the wave switch; Calculating a difference between the first voltage information and the first voltage threshold to obtain first voltage difference information; Obtaining second voltage information according to the first cycle information; determining first time information according to the second voltage information and the first voltage difference information; According to the first time information, the wave generating switch is closed.

[0006] In this solution, the first voltage information is obtained according to the first cycle information, specifically: Get the second cycle information; According to the second cycle information, first collected voltage information is obtained; According to the first collected voltage information and a preset filtering strategy, a first voltage sequence is obtained; According to the first voltage sequence and a preset maximum value extraction strategy, first voltage information is obtained.

[0007] In this solution, the second voltage information is obtained according to the first cycle information, specifically: Get the third cycle information; Obtaining second collected voltage information according to the third cycle information; According to the second collected voltage information, a second voltage sequence is obtained according to a preset filtering strategy; According to the second voltage sequence and a preset average value calculation strategy, second voltage information is obtained.

[0008] This plan also includes: The second cycle information is at least twice the first cycle information; The third cycle information is at least twice the first cycle information.

[0009] In this solution, the first time information is determined according to the second voltage information and the first voltage difference information, specifically: Obtaining a second voltage threshold according to preset standard input voltage information; Determining whether the second voltage information is lower than the second voltage threshold; If yes, setting the first time information according to the first period information; If not, the first time information is obtained according to the first voltage difference information and a preset time calculation formula.

[0010] This plan also includes: Get second time information; Determining whether the second time information is greater than a preset time threshold; If so, the first period information, the second period information or the third period information is lowered.

[0011] A second aspect of the present invention provides a wave-by-wave voltage limiting control system for an energy storage converter, including a wave-by-wave voltage limiting control method program for an energy storage converter, wherein the wave-by-wave voltage limiting control method program for an energy storage converter implements the following steps when executed by the processor: Get the first cycle information; Obtaining first voltage information according to the first cycle information; Determining whether the first voltage information exceeds a preset first voltage threshold; If yes, disconnect the wave switch; Calculating a difference between the first voltage information and the first voltage threshold to obtain first voltage difference information; Obtaining second voltage information according to the first cycle information; determining first time information according to the second voltage information and the first voltage difference information; According to the first time information, the wave generating switch is closed.

[0012] In this solution, the first voltage information is obtained according to the first cycle information, specifically: Get the second cycle information; According to the second cycle information, first collected voltage information is obtained; According to the first collected voltage information and a preset filtering strategy, a first voltage sequence is obtained; According to the first voltage sequence and a preset maximum value extraction strategy, first voltage information is obtained.

[0013] In this solution, the second voltage information is obtained according to the first cycle information, specifically: Get the third cycle information; Obtaining second collected voltage information according to the third cycle information; According to the second collected voltage information, a second voltage sequence is obtained according to a preset filtering strategy; According to the second voltage sequence and a preset average value calculation strategy, second voltage information is obtained.

[0014] A third aspect of the present invention provides a computer-readable storage medium, which includes a wave-by-wave voltage limiting control method program for an energy storage inverter. When the wave-by-wave voltage limiting control method program for the energy storage inverter is executed by a processor, the steps of the wave-by-wave voltage limiting control method for the energy storage inverter as described in any one of the above items are implemented.

[0015] The present invention provides a wave-by-wave voltage limiting control method, system and storage medium for an energy storage converter. First, first voltage information is obtained according to first cycle information. Secondly, when it is determined that the first voltage information exceeds a preset first voltage threshold, a wave switch is disconnected. Then, first voltage difference information is obtained according to the first voltage information and the first voltage threshold. Finally, first time information is determined according to the second voltage information and the first voltage difference information, which is used for the timed closing of the wave switch. The present invention updates the state of the wave switch according to the set detection cycle. When it is detected that the voltage is too high, the wave is closed by disconnecting the wave switch, thereby effectively controlling the voltage, preventing the voltage from being too high, and improving the operating safety of the energy storage converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and should not be regarded as limiting the scope.

[0017] Figure 1 A flow chart showing a wave-by-wave voltage limiting control method for an energy storage converter according to the present invention is shown; Figure 2 A flowchart of calculating first voltage information provided by an embodiment of the present invention is shown; Figure 3 A flowchart of calculating second voltage information provided by an embodiment of the present invention is shown; Figure 4 A block diagram of a wave-by-wave voltage limiting control system of an energy storage converter according to the present invention is shown. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless the embodiments of the present invention are explicitly defined in this way.

[0020] The words "first", "second" and similar words used in the embodiments of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one", "an" or "the" and similar words do not indicate a quantity limitation, but indicate the existence of at least one. Similarly, words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The steps before or after the method of the embodiment of the present invention are not necessarily carried out in order. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations can also be added to these processes, or a step or several steps can be removed from these processes.

[0021] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0022] Figure 1 A flow chart of a wave-by-wave voltage limiting control method for an energy storage converter according to the present invention is shown.

[0023] like Figure 1 As shown, the present invention discloses a wave-by-wave voltage limiting control method for an energy storage converter, the method comprising: S102, obtaining first cycle information; S104, obtaining first voltage information according to the first cycle information; S106, determining whether the first voltage information exceeds a preset first voltage threshold; S108, if yes, turn off the wave switch; S110, calculating a difference between the first voltage information and the first voltage threshold to obtain first voltage difference information; S112, obtaining second voltage information according to the first cycle information; S114, determining first time information according to the second voltage information and the first voltage difference information; S116: Close the wave-generating switch according to the first time information.

[0024] It should be noted that the wave-generating switch is a control switch tube in the power module of the energy storage converter device, such as IGBT or Sic MOSFFET, which is used to control the output voltage; as an implementation method, when the wave-generating switch is disconnected, the output voltage can be reduced or the rising trend of the output voltage can be reduced. The first voltage information is the arithmetic value of the DC voltage output by the wave-by-wave voltage limiting device of the energy storage converter; the second voltage information is the arithmetic value of the AC voltage input by the wave-by-wave voltage limiting device of the energy storage converter; the first cycle information is the detection and adjustment cycle of the wave-by-wave voltage limiting device, that is, the collection cycle of the first voltage information and the second voltage information and the switching operation cycle of the wave-generating switch; the first time information is the time when the wave-generating switch is in the disconnected state within an adjustment cycle.

[0025] In this embodiment, according to the set first cycle information, the voltage detection and the wave switch adjustment cycle are turned on. First, according to the set voltage acquisition strategy, the arithmetic value of the DC voltage output by the wave-by-wave voltage limiting device of the energy storage converter is obtained, that is, the first voltage information. Secondly, when it is judged that the first voltage information exceeds the preset first voltage threshold, it means that the wave-by-wave voltage limiting device of the energy storage converter has an abnormal situation that the output voltage is too high. At this time, the wave switch is disconnected to reduce the output voltage or reduce the rising trend of the output voltage. Then, the difference between the first voltage information and the first voltage threshold is calculated to obtain the first voltage difference information to indicate that the current output exceeds the normal range, that is, the output voltage amount that needs to be adjusted. Finally, according to the arithmetic value of the AC voltage input by the wave-by-wave voltage limiting device of the energy storage converter and the first voltage difference information, the first time information is obtained according to the set strategy to control the time when the wave switch switches back to the closed state in the current adjustment cycle. The present invention updates the state of the wave-generating switch according to a set detection cycle. When it is detected that the voltage is too high, the wave is blocked by disconnecting the wave-generating switch, thereby effectively controlling the voltage, preventing the voltage from being too high, and improving the operating safety of the energy storage converter.

[0026] Figure 2 A flow chart of calculating first voltage information provided by an embodiment of the present invention is shown.

[0027] According to an embodiment of the present invention, Figure 2 As shown, it also includes: S202, obtaining second cycle information; S204, obtaining first collected voltage information according to the second cycle information; S206, obtaining a first voltage sequence according to the first collected voltage information and a preset filtering strategy; S208: Obtain first voltage information according to the first voltage sequence and a preset maximum value extraction strategy.

[0028] It should be noted that the first collected voltage information is the real-time collected value of the DC voltage output by the wave-by-wave voltage limiting device of the energy storage converter; the second period information is the collection period of the first collected voltage information. In a voltage detection and wave switching adjustment cycle, the real-time collected value of the DC voltage output by the wave-by-wave voltage limiting device of the energy storage converter is collected and recorded according to the second period information, that is, the first collected voltage information. Then, filtering is performed on several first collected voltage information in the same voltage detection and wave switching adjustment cycle, including but not limited to Butterworth low-pass filtering algorithm, Chebyshev low-pass filtering algorithm, Kalman filtering algorithm, etc., to obtain a first voltage sequence. Finally, according to the preset maximum value extraction strategy, the first voltage information is obtained from the first voltage sequence; as an implementation method, the maximum value extraction strategy is to compare and find a maximum value from the first voltage sequence as the output value; as another implementation method, the maximum value extraction strategy is to find the first several maximum values ​​from the first voltage sequence, for example, find the first 3 maximum values, and obtain the output value after the average operation.

[0029] Figure 3 A flow chart of calculating the second voltage information provided by an embodiment of the present invention is shown.

[0030] According to an embodiment of the present invention, Figure 3 As shown, it also includes: S302, obtaining third cycle information; S304, obtaining second collected voltage information according to the third cycle information; S306, obtaining a second voltage sequence according to the second collected voltage information and a preset filtering strategy; S308: Obtain second voltage information according to the second voltage sequence and a preset average value calculation strategy.

[0031] It should be noted that the second collected voltage information is a real-time collected value of the AC voltage input by the wave-by-wave voltage limiting device of the energy storage converter; the third period information is the collection period of the second collected voltage information. In a voltage detection and wave switching adjustment cycle, the real-time collected value of the AC voltage input by the wave-by-wave voltage limiting device of the energy storage converter is collected and recorded according to the third period information, that is, the second collected voltage information; wherein, in practical applications, the input AC power is an AC power with a periodic sine wave. Then, filtering is performed on several second collected voltage information in the same voltage detection and wave switching adjustment cycle, including but not limited to Butterworth low-pass filtering algorithm, Chebyshev low-pass filtering algorithm, Kalman filtering algorithm, etc., to obtain a second voltage sequence. Finally, according to a preset average value calculation strategy, the second voltage information is obtained from the second voltage sequence; as an implementation method, the average value calculation strategy is to perform arithmetic averaging on the second voltage sequence to obtain an output value; as another implementation method, the average value calculation strategy is to sort the second voltage sequence, extract several voltage values ​​in the middle of several sorting queues for arithmetic averaging, and obtain an output value.

[0032] According to an embodiment of the present invention, it also includes: The second cycle information is at least twice the first cycle information; The third cycle information is at least twice the first cycle information.

[0033] It should be noted that the size of the second cycle information and the third cycle information is at least twice that of the first cycle information, so as to ensure that the output DC voltage and input AC voltage of the wave-by-wave voltage limiting device of the energy storage converter can be collected at least twice within the same voltage detection and wave switching adjustment cycle; in practical applications, in order to improve the accuracy of sampling and the efficiency of binary operations, the size of the second cycle information and the third cycle information is usually 8 times or 16 times that of the first cycle information. The second cycle information and the third cycle information can be the same value or different values. In practical applications, the same value is usually used for timing.

[0034] According to an embodiment of the present invention, it also includes: Obtaining a second voltage threshold according to preset standard input voltage information; Determining whether the second voltage information is lower than the second voltage threshold; If yes, setting the first time information according to the first period information; If not, the first time information is obtained according to the first voltage difference information and a preset time calculation formula.

[0035] It should be noted that the standard input voltage information is the standard value of the input voltage of the wave-by-wave voltage limiting device of the energy storage converter. 380 volts AC is used as an example below. The second voltage threshold is the effective value of the standard input voltage value, that is, 380 volts divided by 268.7 volts is obtained. When the second voltage information is lower than the second voltage threshold, it is determined that the real-time value of the input voltage is low, and the rising trend of the output voltage can be reduced by turning off the ripple switch. Therefore, the time of the entire first cycle information is set to the time when the ripple switch is disconnected. When the second voltage information is not lower than the second voltage threshold, it is determined that the real-time value of the input voltage is high, and the output voltage can be reduced by turning off the ripple switch. Therefore, according to the first voltage difference information, the first time information is obtained according to the set time calculation relationship; wherein, as an implementation method, the time calculation relationship is a linear relationship.

[0036] According to an embodiment of the present invention, it also includes: Get second time information; Determining whether the second time information is greater than a preset time threshold; If so, the first time period information, the second time period information or the third time period information is lowered.

[0037] It should be noted that the second time information is the time that the wave-generating switch remains in the closed state after it is switched back to the closed state. When the second time information is greater than the preset time threshold, it means that the output voltage of the wave-by-wave voltage limiting device of the energy storage converter is in a stable state that does not need to be adjusted for a long time. At this time, by lowering the voltage detection and wave-generating switch adjustment cycle, or lowering the voltage acquisition cycle, the computing power demand is reduced to achieve the purpose of reducing power consumption.

[0038] It is worth mentioning that it also includes: Obtain records of second time information; Obtaining the disconnection frequency information of the wave-generating switch according to the record; Determining whether the disconnection frequency information exceeds a preset frequency threshold; If yes, a first warning instruction is sent to the background.

[0039] It should be noted that in the second time information record, the number of records and the length of time are used to indicate the frequency of the wave-by-wave voltage limiting device of the energy storage converter to adjust the wave-generating switch, which is indicated by the disconnection frequency information. When the disconnection frequency information exceeds the preset frequency threshold, it means that the wave-generating switch is adjusted too frequently, and it is determined that the relay on the battery side is abnormal. At this time, the first warning instruction is sent to the background to indicate that the relay on the battery side needs to be repaired and maintained; thereby improving the efficiency of repair and maintenance and improving the operating stability of the energy storage converter device.

[0040] It is worth mentioning that it also includes: Obtaining first deviation value information according to the first cycle information and the first voltage information; Determining whether the first deviation value information exceeds a preset deviation threshold; If so, the first period information is adjusted upward, or the weighted value of the time calculation relationship is adjusted.

[0041] It should be noted that after calculating the difference between the first voltage information of each first cycle information and the standard output voltage value, the average value of the absolute value of the difference is calculated to obtain the first deviation value information. The first deviation value information is used to indicate the stability of the output voltage. When the first deviation value information presets the deviation threshold, it means that the output voltage is in a state of large jitter amplitude for a long time; at this time, the voltage detection and wave switch adjustment frequency are increased by increasing the first cycle information; or the slope in the linear relationship of the time calculation is adjusted to adjust the disconnection time of the wave switch; to achieve the effect of improving the output adjustment accuracy and reducing the jitter amplitude, thereby improving the stability of the output voltage.

[0042] Figure 4 A block diagram of a wave-by-wave voltage limiting control system of an energy storage converter according to the present invention is shown.

[0043] like Figure 4 As shown, the present invention discloses a wave-by-wave voltage limiting control system 4 of an energy storage converter, comprising a memory 41 and a processor 42, wherein the memory comprises a wave-by-wave voltage limiting control method program of the energy storage converter, and when the wave-by-wave voltage limiting control method program of the energy storage converter is executed by the processor, the following steps are implemented: obtaining first cycle information; Obtaining first voltage information according to the first cycle information; Determining whether the first voltage information exceeds a preset first voltage threshold; If yes, disconnect the wave switch; Calculating a difference between the first voltage information and the first voltage threshold to obtain first voltage difference information; Obtaining second voltage information according to the first cycle information; determining first time information according to the second voltage information and the first voltage difference information; According to the first time information, the wave generating switch is closed.

[0044] It should be noted that the wave-generating switch is a control switch tube in the power module of the energy storage converter device, such as IGBT or Sic MOSFFET, which is used to control the output voltage; as an implementation method, when the wave-generating switch is disconnected, the output voltage can be reduced or the rising trend of the output voltage can be reduced. The first voltage information is the arithmetic value of the DC voltage output by the wave-by-wave voltage limiting device of the energy storage converter; the second voltage information is the arithmetic value of the AC voltage input by the wave-by-wave voltage limiting device of the energy storage converter; the first cycle information is the detection and adjustment cycle of the wave-by-wave voltage limiting device, that is, the collection cycle of the first voltage information and the second voltage information and the switching operation cycle of the wave-generating switch; the first time information is the time when the wave-generating switch is in the disconnected state within an adjustment cycle.

[0045] In this embodiment, according to the set first cycle information, the voltage detection and the wave switch adjustment cycle are turned on. First, according to the set voltage acquisition strategy, the arithmetic value of the DC voltage output by the wave-by-wave voltage limiting device of the energy storage converter is obtained, that is, the first voltage information. Secondly, when it is judged that the first voltage information exceeds the preset first voltage threshold, it means that the wave-by-wave voltage limiting device of the energy storage converter has an abnormal situation that the output voltage is too high. At this time, the wave switch is disconnected to reduce the output voltage or reduce the rising trend of the output voltage. Then, the difference between the first voltage information and the first voltage threshold is calculated to obtain the first voltage difference information to indicate that the current output exceeds the normal range, that is, the output voltage amount that needs to be adjusted. Finally, according to the arithmetic value of the AC voltage input by the wave-by-wave voltage limiting device of the energy storage converter and the first voltage difference information, the first time information is obtained according to the set strategy to control the time when the wave switch switches back to the closed state in the current adjustment cycle. The present invention updates the state of the wave-generating switch according to a set detection cycle. When it is detected that the voltage is too high, the wave is blocked by disconnecting the wave-generating switch, thereby effectively controlling the voltage, preventing the voltage from being too high, and improving the operating safety of the energy storage converter.

[0046] According to an embodiment of the present invention, it also includes: Get the second cycle information; According to the second cycle information, first collected voltage information is obtained; According to the first collected voltage information and a preset filtering strategy, a first voltage sequence is obtained; According to the first voltage sequence and a preset maximum value extraction strategy, first voltage information is obtained.

[0047] It should be noted that the first collected voltage information is the real-time collected value of the DC voltage output by the wave-by-wave voltage limiting device of the energy storage converter; the second period information is the collection period of the first collected voltage information. In a voltage detection and wave switching adjustment cycle, the real-time collected value of the DC voltage output by the wave-by-wave voltage limiting device of the energy storage converter is collected and recorded according to the second period information, that is, the first collected voltage information. Then, filtering is performed on several first collected voltage information in the same voltage detection and wave switching adjustment cycle, including but not limited to Butterworth low-pass filtering algorithm, Chebyshev low-pass filtering algorithm, Kalman filtering algorithm, etc., to obtain a first voltage sequence. Finally, according to the preset maximum value extraction strategy, the first voltage information is obtained from the first voltage sequence; as an implementation method, the maximum value extraction strategy is to compare and find a maximum value from the first voltage sequence as the output value; as another implementation method, the maximum value extraction strategy is to find the first several maximum values ​​from the first voltage sequence, for example, find the first 3 maximum values, and obtain the output value after the average operation.

[0048] According to an embodiment of the present invention, it also includes: Get the third cycle information; Obtaining second collected voltage information according to the third cycle information; According to the second collected voltage information, a second voltage sequence is obtained according to a preset filtering strategy; According to the second voltage sequence and a preset average value calculation strategy, second voltage information is obtained.

[0049] It should be noted that the second collected voltage information is a real-time collected value of the AC voltage input by the wave-by-wave voltage limiting device of the energy storage converter; the third period information is the collection period of the second collected voltage information. In a voltage detection and wave switching adjustment cycle, the real-time collected value of the AC voltage input by the wave-by-wave voltage limiting device of the energy storage converter is collected and recorded according to the third period information, that is, the second collected voltage information; wherein, in practical applications, the input AC power is an AC power with a periodic sine wave. Then, filtering is performed on several second collected voltage information in the same voltage detection and wave switching adjustment cycle, including but not limited to Butterworth low-pass filtering algorithm, Chebyshev low-pass filtering algorithm, Kalman filtering algorithm, etc., to obtain a second voltage sequence. Finally, according to a preset average value calculation strategy, the second voltage information is obtained from the second voltage sequence; as an implementation method, the average value calculation strategy is to perform arithmetic averaging on the second voltage sequence to obtain an output value; as another implementation method, the average value calculation strategy is to sort the second voltage sequence, extract several voltage values ​​in the middle of several sorting queues for arithmetic averaging, and obtain an output value.

[0050] According to an embodiment of the present invention, it also includes: The second cycle information is at least twice the first cycle information; The third cycle information is at least twice the first cycle information.

[0051] It should be noted that the size of the second cycle information and the third cycle information is at least twice that of the first cycle information, so as to ensure that the output DC voltage and input AC voltage of the wave-by-wave voltage limiting device of the energy storage converter can be collected at least twice within the same voltage detection and wave switching adjustment cycle; in practical applications, in order to improve the accuracy of sampling and the efficiency of binary operations, the size of the second cycle information and the third cycle information is usually 8 times or 16 times that of the first cycle information. The second cycle information and the third cycle information can be the same value or different values. In practical applications, the same value is usually used for timing.

[0052] According to an embodiment of the present invention, it also includes: Obtaining a second voltage threshold according to preset standard input voltage information; Determining whether the second voltage information is lower than the second voltage threshold; If yes, setting the first time information according to the first period information; If not, the first time information is obtained according to the first voltage difference information and a preset time calculation formula.

[0053] It should be noted that the standard input voltage information is the standard value of the input voltage of the wave-by-wave voltage limiting device of the energy storage converter. 380 volts AC is used as an example below. The second voltage threshold is the effective value of the standard input voltage value, that is, 380 volts divided by 268.7 volts is obtained. When the second voltage information is lower than the second voltage threshold, it is determined that the real-time value of the input voltage is low, and the rising trend of the output voltage can be reduced by turning off the ripple switch. Therefore, the time of the entire first cycle information is set to the time when the ripple switch is disconnected. When the second voltage information is not lower than the second voltage threshold, it is determined that the real-time value of the input voltage is high, and the output voltage can be reduced by turning off the ripple switch. Therefore, according to the first voltage difference information, the first time information is obtained according to the set time calculation relationship; wherein, as an implementation method, the time calculation relationship is a linear relationship.

[0054] According to an embodiment of the present invention, it also includes: Get second time information; Determining whether the second time information is greater than a preset time threshold; If so, the first time period information, the second time period information or the third time period information is lowered.

[0055] It should be noted that the second time information is the time that the wave-generating switch remains in the closed state after it is switched back to the closed state. When the second time information is greater than the preset time threshold, it means that the output voltage of the wave-by-wave voltage limiting device of the energy storage converter is in a stable state that does not need to be adjusted for a long time. At this time, by lowering the voltage detection and wave-generating switch adjustment cycle, or lowering the voltage acquisition cycle, the computing power demand is reduced to achieve the purpose of reducing power consumption.

[0056] It is worth mentioning that it also includes: Obtain records of second time information; Obtaining the disconnection frequency information of the wave-generating switch according to the record; Determining whether the disconnection frequency information exceeds a preset frequency threshold; If yes, a first warning instruction is sent to the background.

[0057] It should be noted that in the second time information record, the number of records and the length of time are used to indicate the frequency of the wave-by-wave voltage limiting device of the energy storage converter to adjust the wave-generating switch, which is indicated by the disconnection frequency information. When the disconnection frequency information exceeds the preset frequency threshold, it means that the wave-generating switch is adjusted too frequently, and it is determined that the relay on the battery side is abnormal. At this time, the first warning instruction is sent to the background to indicate that the relay on the battery side needs to be repaired and maintained; thereby improving the efficiency of repair and maintenance and improving the operating stability of the energy storage converter device.

[0058] It is worth mentioning that it also includes: Obtaining first deviation value information according to the first cycle information and the first voltage information; Determining whether the first deviation value information exceeds a preset deviation threshold; If so, the first period information is adjusted upward, or the weighted value of the time calculation relationship is adjusted.

[0059] It should be noted that after calculating the difference between the first voltage information of each first cycle information and the standard output voltage value, the average value of the absolute value of the difference is calculated to obtain the first deviation value information. The first deviation value information is used to indicate the stability of the output voltage. When the first deviation value information presets the deviation threshold, it means that the output voltage is in a state of large jitter amplitude for a long time; at this time, the voltage detection and wave switch adjustment frequency are increased by increasing the first cycle information; or the slope in the linear relationship of the time calculation is adjusted to adjust the disconnection time of the wave switch; to achieve the effect of improving the output adjustment accuracy and reducing the jitter amplitude, thereby improving the stability of the output voltage.

[0060] A third aspect of the present invention provides a computer-readable storage medium, which includes a wave-by-wave voltage limiting control method program for an energy storage inverter. When the wave-by-wave voltage limiting control method program for the energy storage inverter is executed by a processor, the steps of the wave-by-wave voltage limiting control method for the energy storage inverter as described in any one of the above items are implemented.

[0061] The present invention provides a wave-by-wave voltage limiting control method, system and storage medium for an energy storage converter. First, first voltage information is obtained according to first cycle information. Secondly, when it is determined that the first voltage information exceeds a preset first voltage threshold, the wave switch is disconnected. Then, first voltage difference information is obtained according to the first voltage information and the first voltage threshold. Finally, first time information is determined according to the second voltage information and the first voltage difference information, which is used for the timed closing of the wave switch. The present invention updates the state of the wave switch according to the set detection cycle. When it is detected that the voltage is too high, the wave is closed by disconnecting the wave switch, thereby effectively controlling the voltage, preventing the voltage from being too high, and improving the operating safety of the energy storage converter.

[0062] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program codes.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wave-by-wave voltage limiting control method for an energy storage converter, applied to a wave-by-wave voltage limiting device for an energy storage converter, the device comprising a wave-generating switch, characterized in that: The method comprises: Get the first cycle information; Obtaining first voltage information according to the first cycle information; Determining whether the first voltage information exceeds a preset first voltage threshold; If yes, disconnect the wave switch; Calculating a difference between the first voltage information and the first voltage threshold to obtain first voltage difference information; Obtaining second voltage information according to the first cycle information; determining first time information according to the second voltage information and the first voltage difference information; According to the first time information, the wave generating switch is closed.

2. The wave-by-wave voltage limiting control method for an energy storage converter according to claim 1, characterized in that: The obtaining of the first voltage information according to the first cycle information is specifically: Get the second cycle information; According to the second cycle information, first collected voltage information is obtained; According to the first collected voltage information and a preset filtering strategy, a first voltage sequence is obtained; According to the first voltage sequence and a preset maximum value extraction strategy, first voltage information is obtained.

3. The wave-by-wave voltage limiting control method for an energy storage converter according to claim 1, characterized in that: The obtaining of the second voltage information according to the first cycle information is specifically: Get the third cycle information; Obtaining second collected voltage information according to the third cycle information; According to the second collected voltage information, a second voltage sequence is obtained according to a preset filtering strategy; According to the second voltage sequence and a preset average value calculation strategy, second voltage information is obtained.

4. A wave-by-wave voltage limiting control method for an energy storage converter according to claim 2 or 3, characterized in that: Also includes: The second cycle information is at least twice the first cycle information; The third cycle information is at least twice the first cycle information.

5. The wave-by-wave voltage limiting control method for an energy storage converter according to claim 1, characterized in that: The determining the first time information according to the second voltage information and the first voltage difference information is specifically: Obtaining a second voltage threshold according to preset standard input voltage information; Determining whether the second voltage information is lower than the second voltage threshold; If yes, setting the first time information according to the first period information; If not, the first time information is obtained according to the first voltage difference information and a preset time calculation formula.

6. The wave-by-wave voltage limiting control method for an energy storage converter according to claim 1, characterized in that: Also includes: Get second time information; Determining whether the second time information is greater than a preset time threshold; If so, the first period information, the second period information or the third period information is lowered.

7. A wave-by-wave voltage limiting control system for an energy storage converter, applied to a wave-by-wave voltage limiting device for an energy storage converter, the device comprising a wave-generating switch, characterized in that: The system includes a memory and a processor, wherein the memory includes a wave-by-wave voltage limiting control method program of an energy storage converter, and when the wave-by-wave voltage limiting control method program of the energy storage converter is executed by the processor, the following steps are implemented: Get the first cycle information; Obtaining first voltage information according to the first cycle information; Determining whether the first voltage information exceeds a preset first voltage threshold; If yes, disconnect the wave switch; Calculating a difference between the first voltage information and the first voltage threshold to obtain first voltage difference information; Obtaining second voltage information according to the first cycle information; determining first time information according to the second voltage information and the first voltage difference information; According to the first time information, the wave generating switch is closed.

8. The wave-by-wave voltage limiting control system of an energy storage converter according to claim 7, characterized in that: The obtaining of the first voltage information according to the first cycle information is specifically: Get the second cycle information; According to the second cycle information, first collected voltage information is obtained; According to the first collected voltage information and a preset filtering strategy, a first voltage sequence is obtained; According to the first voltage sequence and a preset maximum value extraction strategy, first voltage information is obtained.

9. The wave-by-wave voltage limiting control system of an energy storage converter according to claim 7, characterized in that: The obtaining of the second voltage information according to the first cycle information is specifically: Get the third cycle information; Obtaining second collected voltage information according to the third cycle information; According to the second collected voltage information, a second voltage sequence is obtained according to a preset filtering strategy; According to the second voltage sequence and a preset average value calculation strategy, second voltage information is obtained.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The computer-readable storage medium includes a wave-by-wave voltage limiting control method program for an energy storage inverter. When the wave-by-wave voltage limiting control method program for the energy storage inverter is executed by a processor, the steps of the wave-by-wave voltage limiting control method for the energy storage inverter as described in any one of claims 1 to 6 are implemented.

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