A hybrid energy storage system converter off-grid control method and system

Abstract

The present invention provides a hybrid energy storage system converter off-grid control method and system, belonging to the technical field of energy storage devices, specifically comprising: real-time acquisition of grid-side energy storage regulation demand, determination of regulation probabilities of different types of energy storage regulation devices in different energy storage regulation intervals according to remaining capacity, predicted regulation capacity and regulation probability, determination of an optimal energy storage regulation device in combination with regulation power quality and regulation deviation in different energy storage regulation intervals, grid-connected regulation control using the optimal energy storage regulation device, off-grid control of other energy storage regulation devices through the distribution of regulation rate deviation moments of the optimal energy storage regulation device and regulation capacity demand, thereby further ensuring the reliability of energy storage regulation.

Description

Technical Field

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

[0002] The energy storage system in the microgrid is an indispensable component. The energy storage system can provide short-term power supply for the power grid, smooth out the peak and fill the valley, improve the reliability and power quality of the power grid when connected to the grid, and optimize the operation of distributed energy. However, the use of a single energy storage system cannot simultaneously meet the constraints of energy storage regulation efficiency and energy storage capacity. Therefore, how to achieve off-grid control of the converter of the hybrid energy storage system has become a technical problem that needs to be solved urgently.

[0003] In the prior art solution, in the invention patent application CN202311750989.3 “Energy storage system and its operation mode control method”, the state of the energy storage system is monitored to control the converter module of the energy storage system, thereby switching between the grid-connected mode and the off-grid mode. However, at the same time, there are the following technical problems:

[0004] For hybrid energy storage systems, since the characteristics of different energy storage devices vary to a certain extent, if differentiated off-grid and on-grid control strategies cannot be generated in combination with different grid-side demands, the energy storage regulation effect of the hybrid energy storage system cannot be guaranteed.

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

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

[0007] In order to solve the above technical problems, the present invention provides a hybrid energy storage system converter off-grid control method, characterized in that:

[0008] S1 obtains the energy storage regulation demand on the grid side in real time, and determines the predicted regulation capacity and regulation probability of the energy storage regulation demand, and the predicted regulation rate and predicted probability at different regulation times according to the time period corresponding to the energy storage regulation demand;

[0009] S2 obtains the regulation rate and remaining capacity of different types of energy storage regulation devices of the hybrid energy storage system, and determines the regulation demand deviation of different types of energy storage regulation devices in combination with the predicted regulation capacity and regulation probability of the energy storage regulation demand, the predicted regulation rate and predicted probability at different regulation times, and when the regulation demand deviation meets the requirements, proceeds to the next step;

[0010] S3 determines the regulation probabilities of different types of energy storage regulation devices in different energy storage regulation intervals according to the remaining capacity, the predicted regulation capacity and the regulation probability, and determines the optimal energy storage regulation device in combination with the regulated power quality and the regulation deviation in the different energy storage regulation intervals;

[0011] S4 utilizes the optimal energy storage regulating device to perform grid-connected regulation control, and controls other energy storage regulating devices off-grid through the distribution of regulation rate deviation moments and regulation capacity requirements of the optimal energy storage regulating device.

[0012] A further technical solution is that the energy storage regulation demand on the grid side is determined based on the acquisition result of the energy storage regulation instruction on the grid side.

[0013] A further technical solution is that the method for determining the predicted regulation capacity of the energy storage regulation demand is:

[0014] Determine a matching historical period according to the period corresponding to the energy storage regulation demand, and determine the historical energy storage regulation capacity of different matching historical periods according to the energy storage regulation data of the matching historical period;

[0015] The adjustment times corresponding to different historical energy storage adjustment capacities are determined by matching the historical energy storage adjustment capacities of different historical time periods, and the demand capacity is predicted by using the adjustment times.

[0016] A further technical solution is to use the adjustment times to determine the predicted demand capacity, specifically including:

[0017] The historical energy storage regulation capacity with the most regulation times is used as the predicted demand capacity, and the regulation probability of the predicted demand capacity is determined by the proportion of the corresponding regulation times.

[0018] A further technical solution is that the predicted probability of the predicted regulation rate is determined according to the proportion of the number of adjustments corresponding to the credible regulation rate interval.

[0019] A further technical solution is that the method for determining the optimal energy storage regulating device is:

[0020] Dividing the energy storage regulation interval into different regulation sub-intervals according to the distribution of regulated power quality in different energy storage regulation intervals, and determining the power quality evaluation value of the energy storage regulation device according to the regulation probabilities corresponding to different regulation sub-intervals and the regulated power quality of different regulation sub-intervals;

[0021] The comprehensive regulation priority value of the energy storage regulation device is determined by the regulation deviation of the energy storage regulation device and the power quality assessment value, and the optimal energy storage regulation device is determined by using the comprehensive regulation priority value.

[0022] A further technical solution is to use the comprehensive adjustment priority value to determine the optimal energy storage adjustment device, specifically including:

[0023] The energy storage regulating device with the largest comprehensive regulating priority value is taken as the optimal energy storage regulating device.

[0024] On the other hand, the present invention provides a hybrid energy storage system converter off-grid and on-grid control system, which adopts the above-mentioned hybrid energy storage system converter off-grid and on-grid control method, and is characterized by specifically comprising:

[0025] Probability assessment module, demand deviation assessment module, adjustment device determination module, control strategy output module;

[0026] The probability evaluation module is responsible for obtaining the energy storage regulation demand of the grid side in real time, and determining the predicted regulation capacity and regulation probability of the energy storage regulation demand, and the predicted regulation rate and predicted probability at different regulation times according to the corresponding time period of the energy storage regulation demand;

[0027] The demand deviation evaluation module is responsible for obtaining the regulation rate and remaining capacity of different types of energy storage regulation devices of the hybrid energy storage system, and determining the regulation demand deviation of different types of energy storage regulation devices in combination with the predicted regulation capacity and regulation probability of the energy storage regulation demand, the predicted regulation rate and predicted probability at different regulation times;

[0028] The regulating device determination module determines the regulating probabilities of different types of energy storage regulating devices in different energy storage regulating intervals according to the remaining capacity, the predicted regulating capacity and the regulating probability, and determines the optimal energy storage regulating device in combination with the regulating power quality and the regulating deviation in different energy storage regulating intervals;

[0029] The control strategy output module is responsible for utilizing the optimal energy storage regulating device for grid-connected regulation control, and for controlling other energy storage regulating devices off-grid through the distribution of regulation rate deviation moments of the optimal energy storage regulating device and regulation capacity requirements.

[0030] The beneficial effects of the present invention are:

[0031] 1. The optimal energy storage regulation device is determined according to the regulation probability in different energy storage regulation intervals, the regulation power quality in different energy storage regulation intervals and the regulation deviation. Not only the difference in regulation reliability of the energy storage regulation device caused by the regulation power quality in different energy storage regulation intervals is considered, but also the deviation in regulation reliability caused by deviation from the two angles of regulation rate and regulation capacity is comprehensively considered by further adjusting the deviation, thereby realizing the determination of the optimal energy storage regulation device from multiple angles.

[0032] 2. The off-grid control of other energy storage regulating devices is carried out through the distribution of the regulating rate deviation moments of the optimal energy storage regulating device and the regulating capacity demand, thereby avoiding the technical problem that the regulating result of the optimal energy storage regulating device cannot meet the energy storage regulation requirements due to the excessive concentration and high probability of the distribution of the regulating rate deviation moments, and ensuring the reliability of energy storage regulation.

[0033] Other features and advantages will be described in the following description, and partly become apparent from the description, or understood by practicing the invention. The purpose and other advantages of the invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0034] 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

[0035] 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.

[0036] Figure 1 It is a flow chart of a hybrid energy storage system converter off-grid control method;

[0037] Figure 2 It is a flow chart of a method for determining the forecasting regulation capacity of energy storage regulation demand;

[0038] Figure 3 It is a flow chart of a method for determining a regulation demand deviation amount of an energy storage regulation device. DETAILED DESCRIPTION

[0039] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0040] The terms "a", "an", "the", and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0041] Example 1

[0042] To solve the above problems, according to one aspect of the present invention, Figure 1 According to one aspect of the present invention, a hybrid energy storage system converter off-grid control method is provided, characterized in that:

[0043] S1 obtains the energy storage regulation demand on the grid side in real time, and determines the predicted regulation capacity and regulation probability of the energy storage regulation demand, and the predicted regulation rate and predicted probability at different regulation times according to the time period corresponding to the energy storage regulation demand;

[0044] S2 obtains the regulation rate and remaining capacity of different types of energy storage regulation devices of the hybrid energy storage system, and determines the regulation demand deviation of different types of energy storage regulation devices in combination with the predicted regulation capacity and regulation probability of the energy storage regulation demand, the predicted regulation rate and predicted probability at different regulation times, and when the regulation demand deviation meets the requirements, proceeds to the next step;

[0045] S3 determines the regulation probabilities of different types of energy storage regulation devices in different energy storage regulation intervals according to the remaining capacity, the predicted regulation capacity and the regulation probability, and determines the optimal energy storage regulation device in combination with the regulated power quality and the regulation deviation in the different energy storage regulation intervals;

[0046] S4 utilizes the optimal energy storage regulating device to perform grid-connected regulation control, and controls other energy storage regulating devices off-grid through the distribution of regulation rate deviation moments and regulation capacity requirements of the optimal energy storage regulating device.

[0047] Furthermore, the energy storage regulation demand on the grid side is determined according to the acquisition result of the energy storage regulation instruction on the grid side.

[0048] Specifically, Figure 2 As shown, the method for determining the predicted regulation capacity of the energy storage regulation demand is:

[0049] Determine a matching historical period according to the period corresponding to the energy storage regulation demand, and determine the historical energy storage regulation capacity of different matching historical periods according to the energy storage regulation data of the matching historical period;

[0050] The adjustment times corresponding to different historical energy storage adjustment capacities are determined by matching the historical energy storage adjustment capacities of different historical time periods, and the demand capacity is predicted by using the adjustment times.

[0051] It should be noted that the use of the adjustment times to determine the predicted demand capacity specifically includes:

[0052] The historical energy storage regulation capacity with the most regulation times is used as the predicted demand capacity, and the regulation probability of the predicted demand capacity is determined by the proportion of the corresponding regulation times.

[0053] Specifically, the method for determining the predicted adjustment rate is:

[0054] Determine a matching historical period according to the period corresponding to the energy storage regulation demand, and determine energy storage regulation rates at different regulation moments of different matching historical periods according to energy storage regulation data of the matching historical period;

[0055] Determine the number of adjustments in different adjustment rate intervals by using the energy storage adjustment rates at different adjustment moments in different matching historical periods, and use the number of adjustments to determine the screening adjustment rate interval in the different adjustment rate intervals;

[0056] The credible regulation rate interval is determined according to the deviation between different screening regulation rate intervals, and the predicted regulation rate is determined using the average value of the regulation rates in the credible regulation rate interval.

[0057] Further, the reliable adjustment rate interval is determined according to the deviation between different screening adjustment rate intervals, specifically including:

[0058] The screening adjustment rate interval is divided into different adjacent adjustment rate intervals according to the deviations between different screening adjustment rate intervals, and the credible adjustment rate interval is determined according to the adjacent adjustment rate interval with the largest number of screening adjustment rate intervals.

[0059] It can be understood that the predicted probability of the predicted adjustment rate is determined according to the proportion of the number of adjustments corresponding to the credible adjustment rate interval.

[0060] In another embodiment, the method for determining the predicted adjustment rate is:

[0061] Determine a matching historical period according to the period corresponding to the energy storage regulation demand, determine the energy storage regulation rate at different regulation moments of different matching historical periods according to the energy storage regulation data of the matching historical period, and judge whether there is an energy storage regulation rate whose corresponding regulation times account for more than a preset proportion. If so, take the energy storage regulation rate whose corresponding regulation times account for more than the preset proportion as the predicted regulation rate; if not, proceed to the next step;

[0062] Determine the significance of different energy storage regulation rates according to the deviation between the energy storage regulation rate and the proportion of regulation times corresponding to other energy storage regulation rates, and judge whether there is an energy storage regulation rate that satisfies the significance requirements. If so, determine the predicted regulation rate through the energy storage regulation rate with the greatest significance. If not, proceed to the next step.

[0063] Determine the number of adjustments in different adjustment rate intervals by using the energy storage adjustment rates at different adjustment moments in different matching historical periods, and judge whether there is an adjustment rate interval in which the proportion of the number of adjustments is greater than the preset proportion. If so, determine the predicted adjustment rate based on the average value of the adjustment rates in the adjustment rate interval in which the proportion of the number of adjustments is greater than the preset proportion. If not, proceed to the next step.

[0064] The number of adjustments is used to determine the screening adjustment rate interval in different adjustment rate intervals, and the credible adjustment rate interval is determined according to the deviation between different screening adjustment rate intervals, and the average value of the adjustment rate in the credible adjustment rate interval is used to determine the predicted adjustment rate.

[0065] Specifically, Figure 3 As shown, the method for determining the adjustment demand deviation of the energy storage adjustment device is:

[0066] Determine the capacity requirement deviation of different types of energy storage regulating devices of the hybrid energy storage system according to the deviation between the remaining capacity and the preset regulating capacity of different types of energy storage regulating devices of the hybrid energy storage system and the regulation probability;

[0067] Determine the deviation of the regulation rate of different types of energy storage regulating devices of the hybrid energy storage system by using the deviation of the regulation rate of different types of energy storage regulating devices of the hybrid energy storage system from the predicted regulation rate at different regulation moments and the predicted probability;

[0068] The regulation requirement deviations of different types of energy storage regulating devices are determined by using the capacity requirement deviations and regulation rate deviations of different types of energy storage regulating devices of the hybrid energy storage system.

[0069] Furthermore, the value range of the regulation requirement deviation of the energy storage regulation device is between 0 and 1. When the regulation requirement deviation of the energy storage regulation device is greater than a preset deviation threshold, it is determined that the regulation requirement deviation of the energy storage regulation device does not meet the requirements.

[0070] It can be understood that when any item of the adjustment demand deviation does not meet the requirements, it is determined whether there is an energy storage adjustment device whose adjustment demand deviation meets the requirements. If so, the energy storage adjustment device whose adjustment demand deviation meets the requirements is used to perform grid-connected adjustment control. If not, all energy storage adjustment devices are used to perform grid-connected adjustment control.

[0071] In another embodiment, the method for determining the adjustment demand deviation of the energy storage adjustment device is:

[0072] According to the deviation between the remaining capacity of different types of energy storage regulating devices of the hybrid energy storage system and the preset regulating capacity, it is judged whether there is an energy storage regulating device whose remaining capacity meets the requirements, and if so, proceed to the next step; if not, it is determined that the regulating demand deviation of the energy storage regulating device does not meet the requirements;

[0073] Determine the deviation time by comparing the deviations between the regulation rates of different types of energy storage regulation devices of the hybrid energy storage system and the predicted regulation rates at different regulation times, and judge whether there is an energy storage regulation device whose number of deviation times meets the requirements; if so, proceed to the next step; if not, determine that the regulation demand deviations of the energy storage regulation devices do not meet the requirements;

[0074] Determine the capacity requirement deviation of different types of energy storage regulating devices of the hybrid energy storage system according to the deviation between the remaining capacity and the preset regulation capacity of different types of energy storage regulating devices of the hybrid energy storage system and the regulation probability, and judge whether there is an energy storage regulating device whose capacity requirement deviation meets the requirement, if so, proceed to the next step, if not, determine that the regulation requirement deviation of the energy storage regulating devices does not meet the requirement;

[0075] Determine the deviation of the regulation rate of different types of energy storage regulating devices of the hybrid energy storage system by comparing the deviation of the regulation rate of different types of energy storage regulating devices of the hybrid energy storage system with the predicted regulation rate at different regulation moments and the predicted probability, and judge whether there is an energy storage regulating device whose regulation rate deviation meets the requirement, if so, proceed to the next step, if not, determine that the regulation demand deviation of the energy storage regulating devices does not meet the requirement;

[0076] The regulation requirement deviations of different types of energy storage regulating devices are determined by using the capacity requirement deviations and regulation rate deviations of different types of energy storage regulating devices of the hybrid energy storage system.

[0077] It should be noted that the method for determining the optimal energy storage regulating device is:

[0078] Dividing the energy storage regulation interval into different regulation sub-intervals according to the distribution of regulated power quality in different energy storage regulation intervals, and determining the power quality evaluation value of the energy storage regulation device according to the regulation probabilities corresponding to different regulation sub-intervals and the regulated power quality of different regulation sub-intervals;

[0079] The comprehensive regulation priority value of the energy storage regulation device is determined by the regulation deviation of the energy storage regulation device and the power quality assessment value, and the optimal energy storage regulation device is determined by using the comprehensive regulation priority value.

[0080] Further, the optimal energy storage regulating device is determined by using the comprehensive regulating priority value, specifically including:

[0081] The energy storage regulating device with the largest comprehensive regulating priority value is taken as the optimal energy storage regulating device.

[0082] In another embodiment, the method for determining the optimal energy storage regulating device is:

[0083] The energy storage regulation interval is divided into different regulation sub-intervals according to the distribution of the regulated power quality in different energy storage regulation intervals. When any of the different types of energy storage regulation devices has a regulation sub-interval in which the regulated power quality does not meet the requirements:

[0084] Determine whether different types of energy storage regulating devices all have regulating sub-intervals where the regulating power quality does not meet the requirements. If so, proceed to the next step. If not, determine the optimal energy storage regulating device through energy storage regulating devices that do not have regulating sub-intervals where the regulating power quality does not meet the requirements.

[0085] Determine the power quality evaluation value of the energy storage regulating device according to the regulation probabilities corresponding to different regulation sub-intervals and the regulated power quality of different regulation sub-intervals, determine the comprehensive regulation priority value of the energy storage regulating device according to the regulation deviation amount and the power quality evaluation value of the energy storage regulating device, and determine the optimal energy storage regulating device using the comprehensive regulation priority value;

[0086] When different types of energy storage regulating devices do not have regulating sub-intervals where the regulating power quality does not meet the requirements;

[0087] Determine whether the deviation between the adjustment deviations of different types of energy storage adjustment devices is greater than a preset deviation threshold, if so, use the adjustment deviation to determine the optimal energy storage adjustment device, if not, proceed to the next step;

[0088] The power quality evaluation value of the energy storage regulation device is determined according to the regulation probability corresponding to different regulation sub-intervals and the regulation power quality of different regulation sub-intervals, the comprehensive regulation priority value of the energy storage regulation device is determined by the regulation deviation of the energy storage regulation device and the power quality evaluation value, and the optimal energy storage regulation device is determined using the comprehensive regulation priority value.

[0089] It should be noted that the off-grid control method of the other energy storage regulating device is:

[0090] Determine the energy storage regulating capacity of other energy storage regulating devices according to the regulating capacity requirements at different regulating rate deviation moments, and determine the grid-connected supplementary amount of the energy storage regulating devices in combination with the remaining capacity of other energy storage regulating devices;

[0091] The moment when the regulation rate of the optimal energy storage regulation device is less than the predicted regulation rate is taken as the regulation rate deviation moment, and the deviation probabilities of different regulation rate deviation moments are determined according to the predicted probabilities of the predicted regulation rates at different moments;

[0092] Determine the comprehensive deviation probability in different unit time periods through the distribution of the adjustment rate deviation moments in different unit time periods and the deviation probability at different adjustment rate deviation moments;

[0093] Determine whether the comprehensive deviation probability is greater than the preset deviation probability. If so, control the other energy storage regulation devices to be in a grid-connected state within the unit time period and meet the energy storage regulation demand. If not, control the grid connection and off-grid connection based on the grid-connected supplement amount of other energy storage regulation devices within the current time period.

[0094] In another embodiment, the off-grid control method of the other energy storage regulating device is:

[0095] The moment when the regulation rate of the optimal energy storage regulation device is less than the predicted regulation rate is taken as the regulation rate deviation moment, and the time period corresponding to the energy storage regulation demand is divided into a plurality of unit time periods according to a preset duration, and it is determined whether the number of regulation rate deviation moments within the unit time period meets the requirement, and if so, the next step is entered, and if not, it is determined to control the other energy storage regulation devices to be in a grid-connected state within the unit time period, and the energy storage regulation demand is met;

[0096] Determine the continuous deviation period in the unit time period according to the distribution of the adjustment rate deviation moments in the unit time period, and judge whether the number of continuous deviation periods in the unit time period meets the requirement, if so, proceed to the next step, if not, determine to control the other energy storage adjustment devices to be in a grid-connected state in the unit time period, and meet the energy storage adjustment requirements;

[0097] Determine whether the longest duration of the continuous deviation period within the unit time period meets the requirement, if so, proceed to the next step, if not, determine to control the other energy storage adjustment devices to be in a grid-connected state within the unit time period, and meet the energy storage adjustment requirements;

[0098] Determine the deviation probabilities of different adjustment rate deviation moments according to the predicted probabilities of the predicted adjustment rates at different moments, and determine the comprehensive deviation probabilities in different unit time periods according to the distribution of the adjustment rate deviation moments in different unit time periods and the deviation probabilities at different adjustment rate deviation moments;

[0099] Determine whether the comprehensive deviation probability is greater than the preset deviation probability. If so, control the other energy storage regulation devices to be in a grid-connected state within the unit time period and meet the energy storage regulation requirements. If not, do not perform grid-connection and off-grid control for the time being.

[0100] Example 2

[0101] On the other hand, the present invention provides a hybrid energy storage system converter off-grid and on-grid control system, which adopts the above-mentioned hybrid energy storage system converter off-grid and on-grid control method, and is characterized by specifically comprising:

[0102] Probability assessment module, demand deviation assessment module, adjustment device determination module, control strategy output module;

[0103] The probability evaluation module is responsible for obtaining the energy storage regulation demand of the grid side in real time, and determining the predicted regulation capacity and regulation probability of the energy storage regulation demand, and the predicted regulation rate and predicted probability at different regulation times according to the corresponding time period of the energy storage regulation demand;

[0104] The demand deviation evaluation module is responsible for obtaining the regulation rate and remaining capacity of different types of energy storage regulation devices of the hybrid energy storage system, and determining the regulation demand deviation of different types of energy storage regulation devices in combination with the predicted regulation capacity and regulation probability of the energy storage regulation demand, the predicted regulation rate and predicted probability at different regulation times;

[0105] The regulating device determination module determines the regulating probabilities of different types of energy storage regulating devices in different energy storage regulating intervals according to the remaining capacity, the predicted regulating capacity and the regulating probability, and determines the optimal energy storage regulating device in combination with the regulating power quality and the regulating deviation in different energy storage regulating intervals;

[0106] The control strategy output module is responsible for utilizing the optimal energy storage regulating device for grid-connected regulation control, and for controlling other energy storage regulating devices off-grid through the distribution of regulation rate deviation moments of the optimal energy storage regulating device and regulation capacity requirements.

[0107] 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.

[0108] 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.

[0109] 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 hybrid energy storage system converter off-grid control method, characterized in that: Acquire the energy storage regulation demand of the grid side in real time, and determine the predicted regulation capacity and regulation probability of the energy storage regulation demand, and the predicted regulation rate and predicted probability at different regulation times according to the time period corresponding to the energy storage regulation demand; Obtaining the regulation rates and remaining capacities of different types of energy storage regulation devices of the hybrid energy storage system, and determining the regulation demand deviations of different types of energy storage regulation devices in combination with the predicted regulation capacity and regulation probability of the energy storage regulation demand, the predicted regulation rates and predicted probabilities at different regulation times, and when the regulation demand deviations meet the requirements, proceeding to the next step; Determine the regulation probabilities of different types of energy storage regulation devices in different energy storage regulation intervals according to the remaining capacity, predicted regulation capacity and regulation probability, and determine the optimal energy storage regulation device in combination with the regulated power quality and regulation deviation in different energy storage regulation intervals; The optimal energy storage regulating device is used to perform grid-connected regulation control, and other energy storage regulating devices are controlled to be off-grid through the distribution of regulation rate deviation moments and regulation capacity requirements of the optimal energy storage regulating device; Determine a matching historical period according to the period corresponding to the energy storage regulation demand, and determine the historical energy storage regulation capacity of different matching historical periods according to the energy storage regulation data of the matching historical period; Determine the adjustment times corresponding to different historical energy storage adjustment capacities by using historical energy storage adjustment capacities of different matching historical time periods, and use the adjustment times to determine the predicted demand capacity; The historical energy storage regulation capacity with the most regulation times is used as the predicted demand capacity, and the regulation probability of the predicted demand capacity is determined by the proportion of the corresponding regulation times; The method for determining the regulation demand deviation of the energy storage regulation device is as follows: Determine the capacity requirement deviation of different types of energy storage regulating devices of the hybrid energy storage system according to the deviation between the remaining capacity and the preset regulating capacity of different types of energy storage regulating devices of the hybrid energy storage system and the regulation probability; Determine the deviation of the regulation rate of different types of energy storage regulating devices of the hybrid energy storage system by using the deviation of the regulation rate of different types of energy storage regulating devices of the hybrid energy storage system from the predicted regulation rate at different regulation moments and the predicted probability; The regulation requirement deviations of different types of energy storage regulating devices are determined by using the capacity requirement deviations and regulation rate deviations of different types of energy storage regulating devices of the hybrid energy storage system.

2. The hybrid energy storage system converter off-grid and on-grid control method according to claim 1, characterized in that: The energy storage regulation demand on the grid side is determined according to the acquisition result of the energy storage regulation instruction on the grid side.

3. The hybrid energy storage system converter off-grid and on-grid control method according to claim 1, characterized in that: The method for determining the predicted regulation capacity of the energy storage regulation demand is: Determine a matching historical period according to the period corresponding to the energy storage regulation demand, and determine the historical energy storage regulation capacity of different matching historical periods according to the energy storage regulation data of the matching historical period; The adjustment times corresponding to different historical energy storage adjustment capacities are determined by matching the historical energy storage adjustment capacities of different historical time periods, and the demand capacity is predicted by using the adjustment times.

4. The hybrid energy storage system converter off-grid and on-grid control method according to claim 3, characterized in that: Determining the predicted demand capacity by using the adjustment times specifically includes: The historical energy storage regulation capacity with the most regulation times is used as the predicted demand capacity, and the regulation probability of the predicted demand capacity is determined by the proportion of the corresponding regulation times.

5. The hybrid energy storage system converter off-grid and on-grid control method according to claim 1, characterized in that: The method for determining the regulation demand deviation of the energy storage regulation device is as follows: Determine the capacity requirement deviation of different types of energy storage regulating devices of the hybrid energy storage system according to the deviation between the remaining capacity and the preset regulating capacity of different types of energy storage regulating devices of the hybrid energy storage system and the regulation probability; Determine the deviation of the regulation rate of different types of energy storage regulating devices of the hybrid energy storage system by using the deviation of the regulation rate of different types of energy storage regulating devices of the hybrid energy storage system from the predicted regulation rate at different regulation moments and the predicted probability; The regulation requirement deviations of different types of energy storage regulating devices are determined by using the capacity requirement deviations and regulation rate deviations of different types of energy storage regulating devices of the hybrid energy storage system.

6. The hybrid energy storage system converter off-grid and on-grid control method according to claim 1, characterized in that: The value range of the regulation requirement deviation of the energy storage regulation device is between 0 and 1. When the regulation requirement deviation of the energy storage regulation device is greater than the preset deviation threshold, it is determined that the regulation requirement deviation of the energy storage regulation device does not meet the requirements.

7. The hybrid energy storage system converter off-grid and on-grid control method according to claim 1, characterized in that: When any item of the adjustment demand deviation does not meet the requirements, determine whether there is an energy storage adjustment device whose adjustment demand deviation meets the requirements. If so, use the energy storage adjustment device whose adjustment demand deviation meets the requirements to perform grid-connected adjustment control. If not, use all energy storage adjustment devices to perform grid-connected adjustment control.

8. The hybrid energy storage system converter off-grid and on-grid control method according to claim 1, characterized in that: The method for determining the optimal energy storage regulating device is: Dividing the energy storage regulation interval into different regulation sub-intervals according to the distribution of regulated power quality in different energy storage regulation intervals, and determining the power quality evaluation value of the energy storage regulation device according to the regulation probabilities corresponding to different regulation sub-intervals and the regulated power quality of different regulation sub-intervals; The comprehensive regulation priority value of the energy storage regulation device is determined by the regulation deviation of the energy storage regulation device and the power quality assessment value, and the optimal energy storage regulation device is determined by using the comprehensive regulation priority value.

9. A hybrid energy storage system converter off-grid and on-grid control system, using a hybrid energy storage system converter off-grid and on-grid control method according to any one of claims 1 to 8, characterized in that: Specifically include: Probability assessment module, demand deviation assessment module, adjustment device determination module, control strategy output module; The probability evaluation module is responsible for obtaining the energy storage regulation demand of the grid side in real time, and determining the predicted regulation capacity and regulation probability of the energy storage regulation demand, and the predicted regulation rate and predicted probability at different regulation times according to the corresponding time period of the energy storage regulation demand; The demand deviation evaluation module is responsible for obtaining the regulation rate and remaining capacity of different types of energy storage regulation devices of the hybrid energy storage system, and determining the regulation demand deviation of different types of energy storage regulation devices in combination with the predicted regulation capacity and regulation probability of the energy storage regulation demand, the predicted regulation rate and predicted probability at different regulation times; The regulating device determination module determines the regulating probabilities of different types of energy storage regulating devices in different energy storage regulating intervals according to the remaining capacity, the predicted regulating capacity and the regulating probability, and determines the optimal energy storage regulating device in combination with the regulating power quality and the regulating deviation in different energy storage regulating intervals; The control strategy output module is responsible for utilizing the optimal energy storage regulating device for grid-connected regulation control, and for controlling other energy storage regulating devices off-grid through the distribution of regulation rate deviation moments of the optimal energy storage regulating device and regulation capacity requirements.

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