A control method and system for a grid-connected energy storage converter

Abstract

The present invention provides a control method and system for a grid-type energy storage inverter, which belongs to the technical field of inverters, and specifically comprises: determining historical data showing that a line voltage drop at an energy storage access point of an energy storage device is not within a preset adjustment range on similar historical dates to the current date based on analysis results of weather data; when determining that the regulation reliability of the energy storage device meets requirements based on analysis results of the historical data, determining regulation matching data of the line voltage drop on different similar historical dates based on the remaining energy storage capacity of the energy storage device; when determining that no matching deviation date exists based on the regulation matching data, determining an input control strategy of the grid-type energy storage inverter when processing the line voltage drop based on the remaining capacity of the energy storage device after adjustment of the line voltage drop on different similar historical dates, thereby improving the reliability of the voltage balancing control of the inverter.

Description

Technical Field

[0001] The present invention belongs to the technical field of converters, and in particular relates to a control method and system for a grid-type energy storage converter. Background Art

[0002] A grid-connected inverter is an inverter that is not directly connected to the power grid, but to other energy storage modules or new energy devices. Its main task is to convert DC power into directly usable AC power, so that the inverter can build the AC side output voltage by itself without relying on the external AC system, thereby achieving rapid frequency and voltage regulation, increasing inertia and short-circuit capacity, and suppressing broadband oscillations, which can effectively improve the ability to accept new energy.

[0003] In order to realize the control of the grid-type inverter, the active command value and reactive command value are used in the invention patent application CN202411268399.1 "A control method, system, device and medium for a grid-type energy storage converter" to compare with the active power calculation value and reactive power calculation value calculated according to the real-time voltage and current at the access point, so as to effectively improve the voltage over-limit problem of the distributed photovoltaic grid-connected area and improve the power supply capacity of the distribution area. However, there are the following technical problems:

[0004] Since the installed capacity of the new energy power generation equipment in the low-voltage distribution area where the energy storage inverter is located is deviated, this leads to deviations in the degree of influence of the grid-type inverter on the stability of the output power of the new energy power generation equipment. Therefore, if the control strategy cannot be determined according to the installed capacity of the new energy power generation equipment, the reliability of the regulation of the energy storage inverter cannot be guaranteed.

[0005] In view of the above technical problems, the present invention specifically provides a control method and system for a grid-type energy storage converter. Summary of the invention

[0006] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0007] According to one aspect of the present invention, a control method for a grid-connected energy storage converter is provided.

[0008] A control method for a grid-type energy storage converter, specifically comprising:

[0009] Based on the analysis results of the weather data, historical data showing that the line voltage drop at the energy storage access point of the energy storage device is not within a preset adjustment range on similar historical dates to the current date is determined; when it is determined based on the analysis results of the historical data that the adjustment reliability of the energy storage device meets the requirements, adjustment matching data of the line voltage drop on different similar historical dates is determined based on the remaining energy storage capacity of the energy storage device;

[0010] When it is determined based on the adjustment matching data that there is no matching deviation date, determining the input control strategy of the grid-type energy storage converter when processing the line voltage drop based on the remaining capacity of the energy storage device after adjustment of the line voltage drop on different similar historical dates;

[0011] When there is a matching deviation date, when it is determined based on the adjustment matching data of the matching deviation date that the adjustment matching degree of the energy storage device does not meet the requirements, it is determined whether it is necessary to perform input control of the grid-connected energy storage inverter according to the monitoring results of the line voltage drop data at the energy storage access point of the energy storage device and the predicted output of the new energy output equipment at the grid connection point.

[0012] The beneficial effects of the present invention are:

[0013] Based on the remaining capacity of the energy storage device after adjusting the line voltage drop on different similar historical dates, the input control strategy of the grid-type energy storage inverter when dealing with the line voltage drop is determined, thereby realizing the determination of the input control strategy of the grid-type energy storage inverter when dealing with the line voltage drop from the perspective of the remaining capacity, avoiding the technical problem of insufficient regulation reliability caused by frequent input processing due to insufficient remaining capacity, and improving the reliability of the line voltage drop regulation processing.

[0014] Based on the monitoring results of the line voltage drop data at the energy storage access point of the energy storage device and the predicted output of the new energy output equipment at the grid connection point, it is determined whether it is necessary to control the input of the grid-type energy storage inverter. This takes into account both the difference in the degree of abnormality of the line voltage drop and the difference in the change of the line voltage drop caused by the predicted output of the future new energy processing equipment. This realizes the input control of the grid-type energy storage inverter from multiple angles, thereby improving the operating reliability of the grid-type energy storage inverter.

[0015] A further technical solution is that the similar historical date is a historical date whose weather data in different dimensions from the date are within a preset deviation range.

[0016] A further technical solution is that the line voltage drop at the energy storage access point of the energy storage device is determined based on monitoring data of a monitoring device at the energy storage access point.

[0017] A further technical solution is that the preset adjustment range is determined according to the capacity of the energy storage device, and is specifically determined by using the capacity of the energy storage device and a preset mapping function.

[0018] A further technical solution is that the historical data includes the historical adjustment times when the line voltage drop at the energy storage access point of the energy storage device is not within a preset adjustment range and the line voltage drops corresponding to different historical adjustment times.

[0019] A further technical solution is to determine whether the regulation reliability of the energy storage device meets the requirements, specifically including:

[0020] Determine the number of historical adjustments in which the line voltage drop at the energy storage access point of the energy storage device is not within a preset adjustment range based on the analysis results of the historical data;

[0021] The number of historical adjustments in which the line voltage drop at the energy storage access point is not within the preset adjustment range is taken as the number of deviation adjustments, and the number of deviation adjustments is used to determine whether the adjustment reliability of the energy storage device meets the requirements.

[0022] A further technical solution is that when the number of deviation adjustments is greater than a preset deviation adjustment number threshold, it is determined that the adjustment reliability of the energy storage device does not meet the requirements.

[0023] A further technical solution is to determine whether it is necessary to control the input of the grid-connected energy storage converter, which specifically includes:

[0024] According to the monitoring result of the line voltage drop data at the energy storage access point of the energy storage device, determine the moment when the line voltage drop at the energy storage access point of the energy storage device is greater than the preset line voltage drop threshold, and use it as the line voltage drop abnormal moment, and judge whether the number of the line voltage drop moments meets the requirement, if so, proceed to the next step, if not, it is necessary to put the grid-type energy storage converter into operation;

[0025] Based on the predicted output of the new energy output equipment at the grid connection point, determine the moment when the predicted output is less than a preset output threshold within a future preset period of time, and use it as the output deviation moment;

[0026] Whether it is necessary to perform input control of the grid-type energy storage converter is determined according to the number of line voltage drop moments and the number of output deviation moments.

[0027] In a second aspect, the present invention provides a computer system comprising: a memory and a processor that are communicatively connected, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the above-mentioned control method of a grid-type energy storage inverter when running the computer program.

[0028] Other features and advantages will be described in the following description. The objects and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and drawings.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0031] Figure 1 The present invention is a flow chart of a control method of a grid-type energy storage converter;

[0032] Figure 2 It is a flow chart to determine whether the regulation reliability of the energy storage device meets the requirements;

[0033] Figure 3 It is a flow chart of a method for determining a control strategy for a grid-type energy storage converter when processing a line voltage drop;

[0034] Figure 4 It is a flow chart to determine that the regulation matching degree of the energy storage device does not meet the requirements;

[0035] Figure 5 It is a framework diagram of a computer system. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0037] Since there is a deviation in the installed capacity of the new energy power generation equipment in the low-voltage distribution area where the energy storage inverter is located, there is a deviation in the degree of influence of the grid-type inverter on the stability of the output power of the new energy power generation equipment. Therefore, if the grid-type inverter is put into use when the voltage fluctuates in the line at the energy storage access point of the energy storage device, it is possible that when the voltage fluctuates violently in the future and the remaining capacity of the energy storage device is insufficient, the control reliability of the voltage fluctuation will be difficult to meet the requirements.

[0038] Similar historical dates: These are historical dates whose weather data in different dimensions are within 3% of the date.

[0039] Regulation reliability of energy storage device: The number of historical adjustments in which the line voltage drop at the energy storage access point of the energy storage device is not within the preset regulation range is taken as the number of deviation adjustments. When the number of deviation adjustments is within 10 times, it is determined that the regulation reliability of the energy storage device meets the requirements.

[0040] Regulation matching data: the deviation between the remaining storage capacity of the energy storage device and the regulation capacity requirement of the line voltage drop on different similar historical dates.

[0041] Matching deviation date: A similar historical date in which the deviation between the remaining energy storage capacity of the energy storage device and the regulating capacity requirement of the line voltage drop is not within the preset deviation range is used as the matching deviation date.

[0042] The grid-type energy storage inverter investment control strategy when dealing with line voltage drop: based on the remaining capacity of the energy storage device after adjusting the line voltage drop on different similar historical dates, the similar historical dates with remaining capacity less than the preset capacity threshold are used as capacity deviation dates. When the number of capacity deviation dates is not greater than the preset number of dates, there is no need to perform investment control of the grid-type energy storage inverter. When there is a line voltage drop, the grid-type energy storage inverter is put into operation. When the number of capacity deviation dates is greater than the preset number of dates, it is necessary to perform investment control of the grid-type energy storage inverter, and use the number of capacity deviation dates to determine the line voltage drop threshold. When it is greater than the line voltage drop threshold, the grid-type energy storage inverter is put into operation.

[0043] Regulation matching degree of energy storage device: Based on the regulation matching data of the matching deviation date, determine the deviation of the regulation capacity demand of the line voltage drop on different matching deviation dates, and use it as the deviation of the matching deviation date. According to the deviation of different matching deviation dates, the absolute values ​​of the deviations on different matching deviation dates are summed and used as the deviation value. When the deviation value is greater than the preset deviation threshold, it is determined that the regulation matching degree of the energy storage device does not meet the requirements.

[0044] Determine whether it is necessary to control the input of the grid-type energy storage inverter: According to the monitoring results of the line voltage drop data at the energy storage access point of the energy storage device, determine the moment when the line voltage drop at the energy storage access point of the energy storage device is greater than the preset line voltage drop threshold, and use it as the line voltage drop abnormal moment, and use the number of line voltage drop moments to determine whether the grid-type energy storage inverter needs to be put into operation.

[0045] Embodiment 1 To solve the above problem, according to one aspect of the present invention, Figure 1 As shown, a first aspect is provided, and the present invention provides a control method for a grid-type energy storage converter, specifically comprising:

[0046] Based on the analysis results of the weather data, historical data showing that the line voltage drop at the energy storage access point of the energy storage device is not within a preset adjustment range on similar historical dates to the current date is determined; when it is determined based on the analysis results of the historical data that the adjustment reliability of the energy storage device meets the requirements, adjustment matching data of the line voltage drop on different similar historical dates is determined based on the remaining energy storage capacity of the energy storage device;

[0047] Furthermore, the similar historical date is a historical date whose weather data in different dimensions are within a preset deviation range from the date.

[0048] Optionally, the line voltage drop at the energy storage access point of the energy storage device is determined based on monitoring data of a monitoring device at the energy storage access point.

[0049] Specifically, the preset adjustment range is determined according to the capacity of the energy storage device, and is specifically determined by using the capacity of the energy storage device and a preset mapping function.

[0050] It is understandable that the historical data includes the historical adjustment times when the line voltage drop at the energy storage access point of the energy storage device is not within the preset adjustment range and the line voltage drops corresponding to different historical adjustment times.

[0051] Specifically, Figure 2 As shown, determining that the regulation reliability of the energy storage device meets the requirements specifically includes:

[0052] Determine the number of historical adjustments in which the line voltage drop at the energy storage access point of the energy storage device is not within a preset adjustment range based on the analysis results of the historical data;

[0053] The number of historical adjustments in which the line voltage drop at the energy storage access point is not within the preset adjustment range is taken as the number of deviation adjustments, and the number of deviation adjustments is used to determine whether the adjustment reliability of the energy storage device meets the requirements.

[0054] Further, when the number of deviation adjustments is greater than a preset deviation adjustment number threshold, it is determined that the adjustment reliability of the energy storage device does not meet the requirements.

[0055] It should also be noted that when the regulation reliability of the energy storage device does not meet the requirements, the grid-type energy storage converter of the energy storage device will be put into operation only when and only when the line voltage drop at the energy storage access point of the energy storage device falls within the preset voltage drop range.

[0056] It is understandable that determining whether the regulation reliability of the energy storage device meets the requirements specifically includes:

[0057] Determine the number of historical adjustments in which the line voltage drop at the energy storage access point of the energy storage device is not within a preset adjustment range based on the analysis results of the historical data;

[0058] The number of historical adjustments where the line voltage drop at the energy storage access point is not within the preset adjustment range is used as the number of deviation adjustments;

[0059] Obtain historical similar dates with the number of deviation adjustments, and use the proportion of historical similar dates with the number of deviation adjustments in the historical similar dates to determine whether the regulation reliability of the energy storage device meets the requirements.

[0060] Optionally, determining whether the regulation reliability of the energy storage device meets the requirements specifically includes:

[0061] S11 determines the number of historical adjustments in which the line voltage drop at the energy storage access point of the energy storage device is not within the preset adjustment range based on the analysis result of the historical data, and uses the number of historical adjustments in which the line voltage drop at the energy storage access point is not within the preset adjustment range as the number of deviation adjustments;

[0062] S12 obtains a historical similar date with a deviation adjustment number, and uses it as the deviation adjustment date, and determines the adjustment deviation coefficient of the deviation adjustment date according to the deviation adjustment number of the deviation adjustment date, the adjustment duration of different deviation adjustment times, and the line voltage drop at the energy storage access point;

[0063] S13 determines an adjustment reliability coefficient based on the adjustment deviation coefficients of different deviation adjustment dates, and uses the adjustment reliability coefficient to determine whether the adjustment reliability of the energy storage device meets the requirements.

[0064] Optionally, the above step S11 includes the following contents:

[0065] S111 determines that the line voltage drop at the energy storage access point of the energy storage device in different historical adjustment times is within the preset adjustment range based on the analysis results of historical data, then determines that the adjustment reliability of the energy storage device meets the requirements; when it is determined that there are historical adjustment times where the line voltage drop at the energy storage access point of the energy storage device is not within the preset adjustment range, proceeds to step S112;

[0066] S112: the number of historical adjustments in which the line voltage drop at the energy storage access point of the energy storage device is not within the preset adjustment range is taken as the number of deviation adjustments. When the number of deviation adjustments does not meet the requirement, it is determined that the adjustment reliability of the energy storage device does not meet the requirement. When the number of deviation adjustments meets the requirement, the process proceeds to step S113.

[0067] S113 determines the average value of the line voltage drop at the energy storage access point based on the line voltage drop at the energy storage access point of the energy storage device in different deviation adjustment times. When the average value of the line voltage drop at the energy storage access point and the deviation adjustment times are both within the preset range, it is determined that the adjustment reliability of the energy storage device does not meet the requirements. When any one of the average value of the line voltage drop at the energy storage access point and the deviation adjustment times is not within the preset range, the process proceeds to step S12.

[0068] Optionally, the above step S12 includes the following contents:

[0069] S121 obtains a historical similar date with a deviation adjustment number, and uses it as a deviation adjustment date. When the deviation adjustment date does not meet the requirement, it is determined that the adjustment reliability of the energy storage device does not meet the requirement. When the deviation adjustment date meets the requirement, the process proceeds to step S122;

[0070] S122 determines the adjustment deviation coefficient of the deviation adjustment date according to the number of deviation adjustments on the deviation adjustment date, the adjustment duration of different deviation adjustment times, and the line voltage drop at the energy storage access point. When the average value of the adjustment deviation coefficients of different deviation adjustment dates is within the preset deviation coefficient interval, the process proceeds to step S123. When the average value of the adjustment deviation coefficients of different deviation adjustment dates is not within the preset deviation coefficient interval, the process proceeds to step S13.

[0071] S123 determines the deviation date coefficient based on the number of deviation adjustment dates and the proportion of the number. When the deviation date coefficient does not meet the requirements, it is determined that the adjustment reliability of the energy storage device does not meet the requirements. When the deviation date coefficient meets the requirements, it goes to step S13.

[0072] When it is determined based on the adjustment matching data that there is no matching deviation date, determining the input control strategy of the grid-type energy storage converter when processing the line voltage drop based on the remaining capacity of the energy storage device after adjustment of the line voltage drop on different similar historical dates;

[0073] Further, the regulation matching data of the line voltage drop on similar historical dates is determined according to the deviation between the remaining energy storage capacity of the energy storage device and the regulation capacity requirement of the line voltage drop on different similar historical dates.

[0074] It can be understood that the matching deviation date is a similar historical date when the deviation between the remaining energy storage capacity of the energy storage device and the regulation capacity requirement of the line voltage drop is not within the preset deviation range.

[0075] Specifically, Figure 3 As shown, the method for determining the input control strategy of the grid-type energy storage converter when processing line voltage drop is:

[0076] Determine similar historical dates with a remaining capacity less than a preset capacity threshold based on the remaining capacity of the energy storage device after adjusting the line voltage drop on different similar historical dates;

[0077] The similar historical date when the remaining capacity is less than the preset capacity threshold is used as the capacity deviation date;

[0078] The input control strategy of the grid-type energy storage converter when processing line voltage drop is determined according to the number of the capacity deviation dates.

[0079] It can be understood that, according to the number of the capacity deviation dates, the input control strategy of the grid-type energy storage converter when processing the line voltage drop is determined, specifically including:

[0080] When the number of the capacity deviation dates is not greater than the preset number of dates, there is no need to control the input of the grid-type energy storage converter. When there is a line voltage drop, the grid-type energy storage converter is always input.

[0081] When the number of capacity deviation dates is greater than the preset number of dates, it is necessary to control the input of the grid-type energy storage inverter, and use the number of capacity deviation dates to determine the line voltage drop threshold. When it is greater than the line voltage drop threshold, the grid-type energy storage inverter is put into operation.

[0082] It should also be noted that the method for determining the input control strategy of the grid-type energy storage converter when processing line voltage drop is as follows:

[0083] Determine similar historical dates with a remaining capacity less than a preset capacity threshold based on the remaining capacity of the energy storage device after adjusting the line voltage drop on different similar historical dates;

[0084] The similar historical date when the remaining capacity is less than the preset capacity threshold is used as the capacity deviation date;

[0085] The line voltage drop threshold is determined according to the proportion of the number of capacity deviation dates, and when it is greater than the line voltage drop threshold, the grid-connected energy storage converter is put into use.

[0086] Optionally, the method for determining the input control strategy of the grid-type energy storage converter when processing line voltage drop is:

[0087] S21 determines similar historical dates with a remaining capacity less than a preset capacity threshold based on the remaining capacity of the energy storage device after adjusting the line voltage drop on different similar historical dates, and uses the similar historical dates with a remaining capacity less than the preset capacity threshold as the capacity deviation date;

[0088] Optionally, the above step S21 includes the following contents:

[0089] S211 is based on the remaining capacity of the energy storage device after adjusting the line voltage drop on different similar historical dates. When it is determined that there is no similar historical date with a remaining capacity less than a preset capacity threshold, there is no need to control the input of the grid-type energy storage converter. When there is a line voltage drop, the grid-type energy storage converter is put into operation. When there is a similar historical date with a remaining capacity less than the preset capacity threshold, the process proceeds to step S212.

[0090] S212: similar historical dates with remaining capacity less than the preset capacity threshold are used as capacity deviation dates. When the number of capacity deviation dates is less than the preset deviation date number, the process proceeds to step S213; when the number of capacity deviation dates is not less than the preset deviation date number, the process proceeds to step S22;

[0091] S213 is based on the remaining capacity on different capacity deviation dates. When it is determined that the remaining capacity on different capacity deviation dates is within the preset capacity range, there is no need to perform input control of the grid-type energy storage inverter. When there is a capacity deviation date when the remaining capacity is not within the preset capacity range, go to step S22.

[0092] S22 determines the capacity deviation coefficients in different divided time periods according to the number of capacity deviation dates in different divided time periods and the remaining capacities on different capacity deviation dates;

[0093] Optionally, the above step S22 includes the following contents:

[0094] S221: when the number of the capacity deviation dates is greater than the preset number of deviation dates, the line voltage drop threshold is determined based on the voltage drop threshold. When it is greater than the line voltage drop threshold, the grid-type energy storage converter is put into use. When the number of the capacity deviation dates is not greater than the preset number of deviation dates, the process proceeds to step S222.

[0095] S222 determines the capacity deviation coefficients in different divided time periods according to the number of capacity deviation dates in different divided time periods and the remaining capacity on different capacity deviation dates. When there is a divided time period in which the capacity deviation coefficient is greater than the preset deviation coefficient threshold, the line voltage drop threshold is determined based on the voltage drop threshold. When it is greater than the line voltage drop threshold, the grid-type energy storage converter is put into use. When there is no divided time period in which the capacity deviation coefficient is greater than the preset deviation coefficient threshold, the process proceeds to step S223.

[0096] S223 obtains the number of time periods in which the capacity deviation coefficient is divided within the preset deviation coefficient interval. When the number of time periods in which the capacity deviation coefficient is divided within the preset deviation coefficient interval is greater than the number of time periods in the preset divided time periods, the line voltage drop threshold is determined based on the voltage drop threshold. When it is greater than the line voltage drop threshold, the grid-type energy storage inverter is put into operation. When the number of time periods in which the capacity deviation coefficient is divided within the preset deviation coefficient interval is not greater than the number of time periods in the preset divided time periods, the process proceeds to step S23.

[0097] S23 determines the preset weight coefficients corresponding to different divided time periods, and determines the comprehensive deviation coefficient in combination with the capacity deviation coefficients in different divided time periods, and determines the line voltage drop threshold with the comprehensive deviation coefficient, and when it is greater than the line voltage drop threshold, the grid-type energy storage converter is put into use.

[0098] Furthermore, the preset weight coefficient corresponding to the divided time period is determined according to the interval length between the divided time period and the current date, and is specifically determined by multiplying the interval length by a preset mapping factor.

[0099] It can be understood that the line voltage drop threshold is determined according to the preset voltage drop threshold corresponding to the comprehensive deviation coefficient.

[0100] When there is a matching deviation date, when it is determined based on the adjustment matching data of the matching deviation date that the adjustment matching degree of the energy storage device does not meet the requirements, it is determined whether it is necessary to perform input control of the grid-connected energy storage inverter according to the monitoring results of the line voltage drop data at the energy storage access point of the energy storage device and the predicted output of the new energy output equipment at the grid connection point.

[0101] Specifically, Figure 4 As shown, determining that the adjustment matching degree of the energy storage device does not meet the requirements specifically includes:

[0102] Based on the adjustment matching data of the matching deviation date, determining the deviation of the adjustment capacity demand of the line voltage drop in different matching deviation dates, and using it as the deviation of the matching deviation date;

[0103] According to the deviation amounts of different matching deviation dates, the absolute values ​​of the deviation amounts of different matching deviation dates are summed and used as the deviation value;

[0104] Based on the deviation value, it is determined whether the adjustment matching degree of the energy storage device meets the requirements.

[0105] Further, when the deviation value is greater than a preset deviation threshold, it is determined that the adjustment matching degree of the energy storage device does not meet the requirements.

[0106] It should also be noted that when the adjustment matching degree of the energy storage device meets the requirements, the input control strategy of the grid-type energy storage converter when processing the line voltage drop is determined based on the remaining capacity of the energy storage device after adjustment of the line voltage drop on different similar historical dates.

[0107] Specifically, it is determined whether it is necessary to control the input of the grid-connected energy storage converter, including:

[0108] According to the monitoring result of the line voltage drop data at the energy storage access point of the energy storage device, determine the moment when the line voltage drop at the energy storage access point of the energy storage device is greater than the preset line voltage drop threshold, and use it as the line voltage drop abnormal moment, and judge whether the number of the line voltage drop moments meets the requirement, if so, proceed to the next step, if not, it is necessary to put the grid-type energy storage converter into operation;

[0109] Based on the predicted output of the new energy output equipment at the grid connection point, determine the moment when the predicted output is less than a preset output threshold within a future preset period of time, and use it as the output deviation moment;

[0110] Whether it is necessary to perform input control of the grid-type energy storage converter is determined according to the number of line voltage drop moments and the number of output deviation moments.

[0111] Further, determining whether it is necessary to perform input control of the grid-type energy storage converter is performed according to the number of line voltage drop moments and the number of output deviation moments, specifically including:

[0112] Based on the preset weight coefficients corresponding to the line voltage drop moment and the output deviation moment, determine the sum of the preset weight coefficients at the line voltage drop moment and the output deviation moment, and use it as the sum of weight coefficients;

[0113] When the weight coefficient and the weight coefficient are within a preset weight coefficient interval, it is determined that there is no need to put the grid-connecting energy storage converter into operation;

[0114] When the weight coefficient and the weight coefficient are not within the preset weight coefficient range, the grid-type energy storage converter needs to be put into operation.

[0115] Embodiment 2 In the second aspect, as Figure 5 As shown, the present invention provides a computer system, comprising: a memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, wherein the processor executes the above-mentioned control method of a grid-type energy storage inverter when running the computer program.

[0116] Optionally, determining that the adjustment matching degree of the energy storage device does not meet the requirement specifically includes:

[0117] Determining the number of matching deviation dates based on the adjustment matching data of the matching deviation dates, and when the number of matching deviation dates is greater than a preset matching deviation date number threshold, determining that the adjustment matching degree of the energy storage device does not meet the requirements;

[0118] When the number of matching deviation dates is not greater than the preset matching deviation date number threshold:

[0119] Determine the deviation of the regulating capacity demand of the line voltage drop on different matching deviation dates, and use it as the deviation of the matching deviation date. When the average value of the deviations on different matching deviation dates is greater than the deviation setting value:

[0120] Acquire the number of matching deviation dates, and when the number of matching deviation dates is within a preset deviation date number interval, determine that the adjustment matching degree of the energy storage device does not meet the requirements;

[0121] When the number of matching deviation dates is not within the preset deviation date number range or the average deviation of different matching deviation dates is not greater than the deviation setting value:

[0122] According to the deviation amounts of different matching deviation dates, the absolute values ​​of the deviation amounts of different matching deviation dates are summed, and the sum is used as the deviation value, and when the deviation value does not meet the requirement, it is determined that the adjustment matching degree of the energy storage device does not meet the requirement;

[0123] When the deviation value meets the requirements:

[0124] Determine the weight coefficients of different matching deviation dates according to the intervals between different matching deviation dates and the current date, and determine the corrected deviation amounts of different matching deviation dates according to the weight coefficients and the deviation amounts, and when the number of matching deviation dates whose corrected deviation amounts do not meet the requirements does not meet the requirements, determine that the adjustment matching degree of the energy storage device does not meet the requirements;

[0125] When the number of matching deviation dates that do not meet the requirement for the corrected deviation amount meets the requirement:

[0126] The adjustment matching coefficient of the energy storage device is determined by the corrected deviation amounts of different matching deviation dates, and the adjustment matching coefficient is used to determine whether the adjustment matching degree of the energy storage device meets the requirements.

[0127] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0128] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0129] The above description is only one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, one or more embodiments of this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of this specification shall be included in the scope of the claims of this specification.

Claims

1. A control method for a grid-type energy storage converter, characterized in that: Specifically include: Based on the analysis results of the weather data, historical data showing that the line voltage drop at the energy storage access point of the energy storage device is not within a preset adjustment range on similar historical dates to the current date is determined; when it is determined based on the analysis results of the historical data that the adjustment reliability of the energy storage device meets the requirements, adjustment matching data of the line voltage drop on different similar historical dates is determined based on the remaining energy storage capacity of the energy storage device; When it is determined based on the adjustment matching data that there is no matching deviation date, determining the input control strategy of the grid-type energy storage converter when processing the line voltage drop based on the remaining capacity of the energy storage device after adjustment of the line voltage drop on different similar historical dates; When there is a matching deviation date, when it is determined based on the adjustment matching data of the matching deviation date that the adjustment matching degree of the energy storage device does not meet the requirements, it is determined whether it is necessary to perform input control of the grid-connected energy storage converter according to the monitoring results of the line voltage drop data at the energy storage access point of the energy storage device and the predicted output of the new energy output equipment at the grid connection point; Determining that the regulation reliability of the energy storage device meets the requirements specifically includes: Determine the number of historical adjustments in which the line voltage drop at the energy storage access point of the energy storage device is not within a preset adjustment range based on the analysis results of the historical data; The number of historical adjustments in which the line voltage drop at the energy storage access point is not within the preset adjustment range is used as the number of deviation adjustments, and the number of deviation adjustments is used to determine whether the adjustment reliability of the energy storage device meets the requirements; When the deviation adjustment times are greater than a preset deviation adjustment times threshold, it is determined that the adjustment reliability of the energy storage device does not meet the requirements; The regulation matching data of the line voltage drop on similar historical dates is determined according to the deviation between the remaining energy storage capacity of the energy storage device and the regulation capacity requirement of the line voltage drop on different similar historical dates; The matching deviation date is a date when the deviation between the remaining energy storage capacity of the energy storage device and the regulation capacity requirement of the line voltage drop on different similar historical dates is not within the preset deviation range; Determining that the adjustment matching degree of the energy storage device does not meet the requirements specifically includes: Based on the adjustment matching data of the matching deviation date, the deviation of the adjustment capacity demand of the line voltage drop in different matching deviation dates is determined, and used as the deviation of the matching deviation date; According to the deviation amounts of different matching deviation dates, the absolute values ​​of the deviation amounts of different matching deviation dates are summed and used as the deviation value; Determining whether the adjustment matching degree of the energy storage device meets the requirements based on the deviation value; When the deviation value is greater than a preset deviation threshold, it is determined that the adjustment matching degree of the energy storage device does not meet the requirements.

2. The control method of the grid-type energy storage converter according to claim 1, characterized in that: The similar historical date is a historical date whose weather data in different dimensions from the date are all within a preset deviation range.

3. The control method of the grid-type energy storage converter according to claim 1, characterized in that: The line voltage drop at the energy storage access point of the energy storage device is determined based on monitoring data of the monitoring device at the energy storage access point.

4. The control method of the grid-type energy storage converter according to claim 1, characterized in that: The preset adjustment range is determined according to the capacity of the energy storage device, and is specifically determined by using the capacity of the energy storage device and a preset mapping function.

5. The control method of the grid-type energy storage converter according to claim 1, characterized in that: When the regulation reliability of the energy storage device does not meet the requirements, the grid-type energy storage converter of the energy storage device is put into operation only when and if the line voltage drop at the energy storage access point of the energy storage device falls within the preset voltage drop range.

6. The control method of the grid-type energy storage converter according to claim 1, characterized in that: Determine whether it is necessary to control the input of the grid-connected energy storage converter, including: According to the monitoring result of the line voltage drop data at the energy storage access point of the energy storage device, determine the moment when the line voltage drop at the energy storage access point of the energy storage device is greater than the preset line voltage drop threshold, and use it as the line voltage drop abnormal moment, and judge whether the number of the line voltage drop abnormal moments meets the requirement, if so, proceed to the next step, if not, it is necessary to put the grid-type energy storage converter into operation; Based on the predicted output of the new energy output equipment at the grid connection point, determine the moment when the predicted output is less than a preset output threshold within a future preset period of time, and use it as the output deviation moment; Whether it is necessary to perform input control of the grid-type energy storage converter is determined according to the number of moments of abnormal voltage drop of the line and the number of moments of output deviation.

7. A computer system comprising: A memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, characterized in that the processor executes a control method for a grid-type energy storage inverter as described in any one of claims 1-6 when running the computer program.

Images