Output Smoothing System and Method for New Energy Energy Storage System

Abstract

The present invention provides a system and method for smoothing the output of a new energy energy storage system, wherein the new energy energy storage system includes a new energy power generation system and an energy storage system, and the method includes: a real-time acquisition system acquires the current state of the energy storage system; determines whether the energy storage system can be enabled according to the current state of the energy storage system acquired by the real-time acquisition system; if so, proceeds to the subsequent process, otherwise ends; the subsequent process includes: the real-time acquisition system acquires the real-time power of the new energy power generation system; determines the output power of the energy storage system according to the real-time power; the real-time acquisition system acquires the current state of charge of the energy storage system; determines whether the energy storage system has the charging condition or the discharging condition according to the calculated output power of the energy storage system and the current state of charge of the energy storage system acquired by the real-time acquisition system; if so, charges the energy storage system or discharges the energy storage system, otherwise ends; the above process is cycled in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy and the application of energy storage in new energy power generation systems, and particularly relates to a control system and method for smoothing the combined output of new energy and energy storage. Background Art

[0002] Due to the characteristics of uncertainty and instability of new energy power generation, etc., the instantaneous increase or drop in the power generated by new energy power generation will cause the output power to be unstable, making the grid-connected power of new energy power generation (such as photovoltaic power generation, wind power generation, etc.) fluctuate continuously. Moreover, as the proportion of new energy power generation in the power grid increases, the smooth control of the output power of new energy power generation has received increasing attention.

[0003] With the continuous development of electrochemical energy storage technology, applying an electrochemical energy storage power station to smooth the output of new energy power generation has gradually become a feasible solution. By reasonably controlling the energy storage converter in the energy storage system to achieve the charge and discharge of the energy storage system, it can largely solve the problem of unstable grid-connected output power of new energy power generation caused by the randomness, intermittency, and volatility of new energy power generation, etc., to meet the smooth output requirements of new energy power generation, and effectively solve the grid frequency fluctuations caused by the fluctuations of new energy power generation, as well as related power quality problems. How to control the energy storage system to complete the fast and accurate smoothing of the grid-connected power of the new energy power station when the energy storage system cooperates with the new energy power generation system to smooth the overall output grid-connected power is a key issue in the application of energy storage in new energy power generation. In addition, the current smoothing control methods are not easy to achieve fast and accurate compensation. Summary of the Invention

[0004] Another object of the present invention is to provide a system and method for smoothing the output of a new energy storage system to solve the problem of how the new energy power generation system coordinates the work of the energy storage system to achieve output smoothing.

[0005] The object of the present invention is to provide a system and method for smoothing the output of a new energy storage system to solve the problem that the existing new energy storage system cannot compensate quickly and accurately during the smoothing process.

[0006] To solve the above technical problems, the present invention provides a method for smoothing the output of new energy storage based on ultra-short-term power generation prediction data.

[0007] Wherein the new energy storage system includes a new energy power generation system and an energy storage system, and the method includes:

[0008] Collect the current state of the energy storage system;

[0009] Determine whether the energy storage system can be enabled according to the collected current state of the energy storage system;

[0010] If so, proceed with the subsequent process; otherwise, the method ends. The subsequent process includes:

[0011] Collect the real-time power of the new energy power generation system;

[0012] Determine the output power of the energy storage system in real time according to the real-time power;

[0013] Collect the current state of charge of the energy storage system;

[0014] Determine whether the energy storage system has the charging condition or the discharging condition according to the calculated output power of the energy storage system and the collected current state of charge of the energy storage system;

[0015] If so, charge the energy storage system or discharge the energy storage system; otherwise, the method ends.

[0016] Optionally, in the output smoothing method of the new energy energy storage system, determining the output power of the energy storage system in real time according to the real-time power includes:

[0017] The coarse adjustment module calculates the coarse adjustment power value of the energy storage system according to the set coarse adjustment value calculation method to improve the response speed of the energy storage system to smooth the total output power of the new energy energy storage system;

[0018] The fine adjustment module determines the fine adjustment power value of the energy storage system according to the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system by using the fine adjustment value control algorithm to improve the accuracy of the energy storage system to smooth the total output power of the new energy energy storage system.

[0019] Optionally, in the output smoothing method of the new energy energy storage system, the coarse adjustment value calculation method includes:

[0020] The coarse adjustment power value of the energy storage system is equal to the product of the predicted power of the new energy power generation system and the set value of the coarse adjustment fluctuation control range;

[0021] The value of the coarse adjustment fluctuation control range is based on the maximum allowable fluctuation ratio in each application scenario.

[0022] Optionally, in the output smoothing method of the new energy energy storage system, the fine adjustment value control algorithm includes:

[0023] Determine the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system;

[0024] Process the difference through control algorithms such as the first-order filtering algorithm, the second-order filtering algorithm, or the PID algorithm to obtain the fine adjustment power value.

[0025] Optionally, in the method for smoothing the output of the new energy energy storage system, it further includes: the total output power of the new energy energy storage system is obtained by the following formula:

[0026]

[0027] Where:

[0028] P bess_real is the output power of the energy storage system;

[0029] P ne_pre is the predicted power of the new energy power generation system;

[0030] P ne_real is the real-time power of the new energy power generation system;

[0031] P out_real is the total output power of the new energy energy storage system;

[0032] k set is the set value of the coarse adjustment fluctuation control range;

[0033] H(s) is the transfer function of the control algorithm, and the control algorithm can be a first-order filtering algorithm, a second-order filtering algorithm, a PID algorithm, etc.

[0034] Optionally, in the method for smoothing the output of the new energy energy storage system, it further includes: the current state includes a normal state, an abnormal state, and a fault state;

[0035] Determining whether the energy storage system can be enabled according to the current state of the energy storage system collected by the real-time acquisition system includes:

[0036] If the current state is a normal state, enter the allowable smoothing compensation mode;

[0037] If the current state is an abnormal state, enter the pause and repair mode;

[0038] If the current state is a fault state, enter the prohibited smoothing compensation mode.

[0039] Optionally, in the method for smoothing the output of the new energy energy storage system, it further includes: the prohibited smoothing compensation mode includes:

[0040] The energy storage system does not output power, and the grid connection point of the new energy power generation system directly outputs the real-time power of the new energy power generation;

[0041] The fault state includes battery system faults of the energy storage system, PCS faults of the energy storage converter, serious faults of the energy storage environmental control system, fire protection system faults, etc., which will cause the energy storage system to fail to work or affect the safe and stable operation of the energy storage system.

[0042] Optionally, in the method for smoothing the output of the new energy energy storage system, it further includes: allowing the smoothing compensation mode to include:

[0043] The new energy power generation prediction platform outputs the predicted power of the new energy power generation within the current period;

[0044] The real-time acquisition system outputs the real-time power of the new energy power generation;

[0045] The coarse adjustment module determines the coarse adjustment power value of the energy storage system according to the predicted power to improve the response speed of the energy storage system to smooth the total output power of the new energy energy storage system;

[0046] The fine adjustment module determines the fine adjustment power value of the energy storage system according to the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system, using the fine adjustment value control algorithm to improve the accuracy of the energy storage system to smooth the total output power of the new energy energy storage system;

[0047] Based on the coarse adjustment power value and the fine adjustment power value, the output power of the energy storage system is calculated in real time. If the calculated output power is positive, the energy storage system discharges; if the calculated output power is negative, the energy storage system is charged.

[0048] Optionally, in the method for smoothing the output of the new energy energy storage system, it further includes: judging whether the energy storage system has the charging condition and the discharging condition according to the calculated output power and the current state of charge collected by the real-time acquisition system, where:

[0049] If the output power is positive and the current state of charge is less than the low threshold, the discharging condition is not available;

[0050] If the output power is negative and the current state of charge is greater than the high threshold, the charging condition is not available;

[0051] Otherwise, the energy storage system has the charging condition and the discharging condition, and the real-time power of the new energy power generation system and the output power of the energy storage system constitute the total output power at the grid connection point;

[0052] When the energy storage system does not have the charging condition or the discharging condition, the grid connection point of the new energy power generation system directly outputs the real-time power of the new energy power generation.

[0053] The present invention also provides an output smoothing system for a new energy energy storage system. The new energy energy storage system includes a new energy power generation system and an energy storage system, and includes:

[0054] A real-time acquisition system configured to perform the following actions:

[0055] Collect the current state of the energy storage system;

[0056] Collect the real-time power of the new energy power generation system;

[0057] Collect the current state of charge of the energy storage system;

[0058] Enable the judgment module, which is configured to judge whether the energy storage system can be enabled according to the current state of the energy storage system collected by the real-time acquisition system. If so, enable the data processing module to perform subsequent processes, otherwise end;

[0059] The data processing module is configured to calculate the output power of the energy storage system in real time according to the real-time power; and

[0060] The condition judgment module is configured to perform the following actions:

[0061] Judge whether the energy storage system has charging conditions or discharging conditions according to the calculated output power of the energy storage system and the current state of charge of the energy storage system collected by the real-time acquisition system;

[0062] If so, enable the new energy power generation system to charge the energy storage system or enable the energy storage system to discharge, otherwise end;

[0063] Among them, the real-time acquisition system, the enable judgment module, the data processing module, and the condition judgment module perform the above processes in real time and cyclically.

[0064] The inventors of the present invention have found through research that in the prior art, there are methods for determining the optimal configuration of the energy storage system capacity through explicit smoothing methods, with the focus on optimizing the configuration of the energy storage capacity; and using the historical power generation data of new energy power generation to fit an ideal smooth output curve, and then using the relationship between the actual output of new energy power generation and the ideal smooth output to determine the output of the energy storage, with the focus on the method of determining the fitting output curve; and proposing a control method for the energy storage system aiming at smoothing new energy power generation, keeping the state of charge of the energy storage system at an appropriate level, improving the continuous charge and discharge ability of the energy storage system, and realizing the coordinated optimization of the smoothing ability and performance indicators of the energy storage system, with the focus on the method of optimizing the SOC of the energy storage system and improving the continuous charge and discharge ability. The above prior arts do not pay attention to the overall output smoothing control process of the new energy system and the relationship between the energy storage system and the ultra-short-term power generation prediction data of the new energy system.

[0065] The present invention realizes the coordinated control of the output smoothing between parts of the whole system by processing according to the current state of the energy storage system collected by the real-time acquisition system and judging whether the energy storage system has charging conditions or discharging conditions on the premise of taking the current state and the current state of charge of the energy storage system as constraint conditions based on the ultra-short-term power generation prediction data of new energy.

[0066] In the output smoothing system and method of the new energy energy storage system provided by the present invention, the support power (which can be positive or negative) required for the energy storage system to smooth the real-time power of the new energy power generation system is calculated as the coarse adjustment power value; the power difference between the predicted value of the power output of the new energy power generation system and the actual output power of the new energy power generation system is introduced into a control algorithm (fine adjustment value control algorithm) for fine adjustment, and the calculation result is used as the fine adjustment power value. By combining the "coarse adjustment" and "fine adjustment" methods, it can meet the requirements of faster response and more accurate control for the new energy energy storage smoothing control. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a schematic diagram of the structure of the output smoothing system of the new energy energy storage system and the relationship between various parameters in an embodiment of the present invention;

[0068] Figure 2 It is a schematic diagram of the flow of the output smoothing method of the new energy energy storage system in an embodiment of the present invention;

[0069] Figure 3 It is a schematic diagram of the control block diagram for calculating the total output power in the output smoothing method of the new energy energy storage system in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0070] The present invention will be further described below in conjunction with the detailed description with reference to the accompanying drawings.

[0071] It should be noted that the components in the drawings may be exaggerated for illustration purposes and are not necessarily to scale. In the drawings, the same or functionally identical components are provided with the same reference numerals.

[0072] In the present invention, unless otherwise specified, "arranged on...", "arranged above...", and "arranged on top of..." do not exclude the existence of intermediate objects between the two. In addition, "arranged on or above..." only represents the relative positional relationship between two components, and in certain cases, such as when the product direction is reversed, it can also be converted to "arranged under or below...", and vice versa.

[0073] In the present invention, each embodiment is only intended to illustrate the solution of the present invention and should not be construed as restrictive.

[0074] In the present invention, unless otherwise specified, the quantifiers "a" and "one" do not exclude the scenario of multiple elements.

[0075] It should also be noted here that, in the embodiments of the present invention, for the sake of clarity and simplicity, only a part of the components or assemblies may be shown. However, those of ordinary skill in the art can understand that, under the teaching of the present invention, the required components or assemblies can be added according to the specific scenario requirements. In addition, unless otherwise specified, the features in different embodiments of the present invention can be combined with each other. For example, a certain feature in the second embodiment can be used to replace the corresponding or functionally identical or similar feature in the first embodiment, and the obtained embodiment also falls within the scope of the disclosure or the scope of the record of this application.

[0076] It should also be noted here that within the scope of the present invention, terms such as "identical", "equal", "equal to" do not mean that the two values are absolutely equal, but allow a certain reasonable error. That is to say, these terms also cover "substantially identical", "substantially equal", "substantially equal to". By analogy, in the present invention, terms indicating directions such as "perpendicular to", "parallel to", etc. also cover the meanings of "substantially perpendicular to", "substantially parallel to".

[0077] In addition, the numbering of the steps of each method of the present invention does not limit the execution order of the method steps. Unless specifically stated, the method steps can be executed in different orders.

[0078] The following further elaborates in detail on the output smoothing system and method of the new energy energy storage system proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. According to the following description and the claims, the advantages and features of the present invention will be clearer. It should be noted that the accompanying drawings all adopt very simplified forms and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0079] The purpose of the present invention also lies in providing an output smoothing system and method for a new energy energy storage system to solve the problem of how a new energy power generation system coordinates the work of the energy storage system to achieve output smoothing.

[0080] The purpose of the present invention is to provide an output smoothing system and method for a new energy energy storage system to solve the problem that the existing new energy energy storage system cannot compensate both quickly and accurately during the smoothing process.

[0081] The purpose of the present invention is to provide an output smoothing system and method for a new energy energy storage system to solve the problem that the existing new energy energy storage system cannot compensate both quickly and precisely during the smoothing process.

[0082] The purpose of the present invention also lies in providing an output smoothing system and method for a new energy energy storage system to solve the problem of how the new energy energy storage system coordinates the work of each power supply system.

[0083] To achieve the above object, the present invention provides an output smoothing system and method for a new energy energy storage system. The new energy energy storage system includes a new energy power generation system and an energy storage system, and includes: a real-time acquisition system collects the current state of the energy storage system; determines whether the energy storage system can be enabled according to the current state of the energy storage system collected by the real-time acquisition system; if so, proceed to the subsequent process, otherwise end; the subsequent process includes: the real-time acquisition system collects the real-time power of the new energy power generation system; calculates the output power of the energy storage system in real time according to the real-time power; the real-time acquisition system collects the current state of charge of the energy storage system; determines whether the energy storage system has a charging condition or a discharging condition according to the calculated output power of the energy storage system and the current state of charge of the energy storage system collected by the real-time acquisition system; if so, charge the energy storage system or discharge the energy storage system, otherwise end; the above process is cycled in real time.

[0084] An embodiment of the present invention provides an output smoothing method for a new energy energy storage system. The new energy energy storage system includes a new energy power generation system and an energy storage system 30, as Figure 2 shown, the real-time acquisition system collects the current state of the energy storage system; determines whether the energy storage system can be enabled according to the current state of the energy storage system collected by the real-time acquisition system; if so, proceed to the subsequent process, otherwise end; the subsequent process includes: the real-time acquisition system collects the real-time power of the new energy power generation system; calculates the output power of the energy storage system in real time according to the real-time power; the real-time acquisition system collects the current state of charge of the energy storage system; determines whether the energy storage system has a charging condition or a discharging condition according to the calculated output power of the energy storage system and the current state of charge of the energy storage system collected by the real-time acquisition system; if so, charge the energy storage system or discharge the energy storage system, otherwise end; the above process is cycled in real time.

[0085] In an embodiment of the present invention, as Figure 1 shown, calculating the output power of the energy storage system in real time according to the real-time power includes: the coarse adjustment module 10 determines the coarse adjustment power value of the energy storage system 30 according to the set coarse adjustment value calculation method to improve the response speed of the energy storage system 30 to smooth the total output power of the new energy energy storage system; the fine adjustment module 20 determines the fine adjustment power value of the energy storage system 30 according to the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system, and uses the fine adjustment value control algorithm to improve the accuracy of the energy storage system 30 to smooth the total output power of the new energy energy storage system.

[0086] In an embodiment of the present invention, as Figure 1 、 3As shown, in the output smoothing method of the new energy energy storage system, the coarse adjustment value calculation method includes: the coarse adjustment power value of the energy storage system is equal to the product of the predicted power of the new energy power generation system and the set value of the coarse adjustment fluctuation control range; the set value of the coarse adjustment fluctuation control range is based on the maximum allowable fluctuation ratio (set by local power companies) in each application scenario.

[0087] In an embodiment of the present invention, as Figure 1 、 3 As shown, in the output smoothing method of the new energy energy storage system, the fine adjustment value control algorithm includes: determining the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system; processing the difference through a first-order filtering algorithm, a second-order filtering algorithm, or a PID algorithm to obtain the fine adjustment power value.

[0088] In an embodiment of the present invention, the coarse adjustment obtains the coarse adjustment value according to the target of smoothing the fluctuation within a certain range, calculates the fine adjustment value by using a first-order filtering, and after passing the battery SOC verification, combines the new energy power generation output and then outputs. As Figure 3 As shown, in the output smoothing method of the new energy energy storage system, it further includes: the total output power of the new energy energy storage system is obtained through the following formula:

[0089]

[0090] Where:

[0091] P bess_real is the output power of the energy storage system;

[0092] P ne_pre is the predicted power of the new energy power generation system;

[0093] P ne_real is the real-time power of the new energy power generation system;

[0094] P out_real is the total output power of the new energy energy storage system;

[0095] k set is the set value of the coarse adjustment fluctuation control range;

[0096] H(s) is the transfer function of the control algorithm, and the control algorithm is a first-order filtering algorithm, a second-order filtering algorithm, or a PID algorithm.

[0097] As Figure 2 As shown, in the output smoothing method of the new energy energy storage system, it further includes: the real-time acquisition system acquires the current state and the current state of charge of the energy storage system, and the current state includes the normal state, the abnormal state, and the fault state; and the real-time acquisition system acquires the real-time power of the new energy power generation system.

[0098] In one embodiment of the present invention, in the method for smoothing the output of the new energy energy storage system, it further includes: processing according to the current state of the energy storage system collected by the real-time acquisition system (such as the step of judging whether the energy storage system is normal as shown in Figure 2 ), and performing it in real-time loop; if the current state is a normal state (yes), then enter the allowable smoothing compensation mode; if the current state is an abnormal state, then enter the pause and repair mode; if the current state is a fault state (no), then enter the prohibited smoothing compensation mode.

[0099] In one embodiment of the present invention, in the method for smoothing the output of the new energy energy storage system, it further includes: the prohibited smoothing compensation mode includes: the energy storage system does not output power, and the grid connection point of the new energy power generation system directly outputs the real-time power of the new energy power generation (jumping to the end step as shown in Figure 2 ); the fault state includes battery system fault of the energy storage system, PCS fault of the energy storage converter, serious fault of the energy storage environmental control system, and fire protection system fault.

[0100] In one embodiment of the present invention, in the method for smoothing the output of the new energy energy storage system, it further includes: the allowable smoothing compensation mode includes: as shown in Figure 2 , the new energy power generation power prediction platform outputs the predicted power of the new energy power generation within the current time period (such as the step of obtaining the ultra-short-term prediction data of the new energy power as shown in Figure 2 ); the real-time acquisition system outputs the real-time power of the new energy power generation (such as the step of sampling and obtaining the actual output of the new energy as shown in Figure 2 ); as shown in Figure 1 , 3 , the coarse adjustment module determines the coarse adjustment power value of the energy storage system according to the predicted power to improve the response speed of the energy storage system to smooth the total output power of the new energy energy storage system (such as the step of calculating the rough adjustment value of the energy storage output as shown in Figure 2 ); as shown in Figure 1 , 3 , the fine adjustment module uses the fine adjustment value control algorithm to determine the fine adjustment power value of the energy storage system according to the difference between the real-time power and the predicted power of the new energy power generation system to improve the accuracy of the energy storage system to smooth the total output power of the new energy energy storage system (such as the step of calculating the fine adjustment value of the energy storage output as shown in Figure 2 ); as shown in Figures 1 - 3 , the coarse adjustment power value and the fine adjustment power value are used to calculate the output power of the energy storage system in real-time (such as the step of calculating the output value of the energy storage system as shown in Figure 2 ). If the calculated output power is positive, the energy storage system discharges; if the calculated output power is negative, it charges the energy storage system.

[0101] From the perspective of the battery, overcharging and overdischarging will both affect the battery life. Therefore, it is necessary to monitor the State of Charge (SOC) of the battery and control the SOC of the battery within a certain range. Moreover, in a new energy and energy storage combined power generation system, if there is no reasonable and effective control strategy to monitor the remaining SOC of the energy storage battery, it will increase unnecessary battery capacity and usage costs.

[0102] Based on the above insights, in an embodiment of the present invention, in the method for smoothing the output of the new energy energy storage system, it further includes: according to the calculated output power and the current SOC collected by the real-time acquisition system, determining whether the energy storage system has the charging condition or the discharging condition (such as the step of determining whether the SOC meets the requirement shown in Figure 2 ), wherein: if the output power is positive and the current SOC is less than the low threshold, then it does not have the discharging condition; if the output power is negative and the current SOC is greater than the high threshold, then it does not have the charging condition; otherwise, the energy storage system has the charging condition and the discharging condition, and the real-time power of the new energy power generation system and the output power of the energy storage system constitute the total output power at the grid connection point (such as the step of calculating the combined output value of new energy and energy storage shown in Figure 2 ); when the energy storage system does not have the charging condition or the discharging condition, the grid connection point of the new energy power generation system directly outputs the real-time power of the new energy power generation (jump to the end step shown in Figure 2 ); under the condition that the current SOC is greater than the third threshold, the energy storage system discharges according to the value of the current SOC.

[0103] The present invention also provides an output smoothing system for a new energy energy storage system. The real-time acquisition system is configured to perform the following actions: collect the current state of the energy storage system; collect the real-time power of the new energy power generation system; collect the current SOC of the energy storage system; an enabling judgment module is configured to determine whether the energy storage system can be enabled according to the current state of the energy storage system collected by the real-time acquisition system. If so, enable the data processing module to perform the subsequent process, otherwise end; the data processing module is configured to calculate the output power of the energy storage system in real time according to the real-time power; and a condition judgment module is configured to perform the following actions: according to the calculated output power of the energy storage system and the current SOC of the energy storage system collected by the real-time acquisition system, determine whether the energy storage system has the charging condition or the discharging condition; if so, enable the new energy power generation system to charge the energy storage system or enable the energy storage system to discharge, otherwise end; wherein the real-time acquisition system, the enabling judgment module, the data processing module, and the condition judgment module perform the above process in real time and in a loop.

[0104] The present invention also provides an output smoothing system for a new energy energy storage system, as shown in Figure 1As shown in the figure, the new energy energy storage system includes a new energy power generation system and an energy storage system 30, including: a coarse adjustment module 10 configured to determine the coarse adjustment power value of the energy storage system 30 according to a set coarse adjustment value calculation method to improve the response speed of the energy storage system to smooth the total output power of the new energy energy storage system; a fine adjustment module 20 configured to determine the fine adjustment power value of the energy storage system 30 according to the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system, and use a fine adjustment value control algorithm to improve the accuracy of the energy storage system to smooth the total output power of the new energy energy storage system.

[0105] The present invention not only focuses on the process of smoothing the output of the overall new energy system, but also performs output smoothing according to the relationship between the energy storage system and the ultra-short-term power prediction data of the new energy system.

[0106] In the output smoothing system and method of the new energy energy storage system provided by the present invention, the support power (which can be positive or negative) required for the energy storage system to smooth the real-time power of the new energy power generation system is calculated as the coarse adjustment power value; the difference between the predicted value of the power output of the new energy power generation system and the actual output power of the new energy power generation system is introduced into a control algorithm (fine adjustment value control algorithm) for fine adjustment, and the calculation result is used as the fine adjustment power value. By combining the "coarse adjustment" and "fine adjustment" methods, it can meet the requirements of faster response and more accurate control for new energy energy storage smoothing control.

[0107] Based on the ultra-short-term power prediction data of new energy, under the premise of taking the current state and current state of charge of the energy storage system as constraints, the present invention processes according to the current state of the energy storage system collected by the real-time acquisition system, and judges whether the energy storage system has the conditions for charging or discharging, realizing the coordinated control between parts of the entire system.

[0108] A method for smoothing the output of new energy energy storage based on ultra-short-term new energy power prediction data according to the present invention, the core of which includes using a method combining "coarse adjustment" and "fine adjustment". Under the condition of determining the smoothing target, the preliminary output adjustment value is quickly determined by "coarse adjustment", and then according to the difference between the real-time output of the new energy power generation system and the ultra-short-term prediction data, it is "fine-tuned" through a control algorithm (such as first-order filtering, PID, etc.) for correction, thereby ensuring the accuracy of control.

[0109] Based on the ultra-short-term new energy power generation prediction data, the present invention can calculate the coarse adjustment value of the energy storage output in advance, with a fast coarse adjustment speed, thus shortening the overall response time; using the difference between the actual output power and the predicted value of the new energy power generation as the fine adjustment value and introducing a control algorithm for fine adjustment, thereby improving the overall adjustment accuracy; using the method of combining coarse adjustment and fine adjustment makes the energy storage system for the purpose of smoothing the new energy power generation output have a faster response speed and higher accuracy.

[0110] In summary, the above embodiments have described in detail different configurations of the output smoothing system and method for a new energy energy storage system. Of course, the present invention includes but is not limited to the configurations listed in the above embodiments. Any content obtained by transformation based on the configurations provided in the above embodiments belongs to the scope protected by the present invention. Those skilled in the art can draw inferences by analogy based on the content of the above embodiments.

[0111] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For the relevant parts, reference can be made to the description in the method section.

[0112] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention in any way. Any changes and modifications made by those of ordinary skill in the art of the present invention based on the above disclosure belong to the scope protected by the claims.

Claims

1. A method for smoothing the output of a new energy energy storage system, wherein the new energy energy storage system includes a new energy power generation system and an energy storage system, characterized in that, the method includes: Collect the current state of the energy storage system; Determine whether the energy storage system can be enabled according to the collected current state of the energy storage system; If so, proceed to the subsequent process, otherwise the method ends, where the subsequent process includes: Collect the real-time power of the new energy power generation system; Determine the output power of the energy storage system in real time according to the real-time power; Collect the current state of charge of the energy storage system; Determine whether the energy storage system has charging conditions or discharging conditions according to the calculated output power of the energy storage system and the collected current state of charge of the energy storage system; If so, charge the energy storage system or discharge the energy storage system, otherwise the method ends; Wherein determining the output power of the energy storage system in real time according to the real-time power includes: The coarse adjustment module determines the coarse adjustment power value of the energy storage system according to the set coarse adjustment value calculation method to improve the response speed of the energy storage system to smooth the total output power of the new energy energy storage system, where the coarse adjustment power value of the energy storage system is equal to the product of the predicted power of the new energy power generation system and the set value of the coarse adjustment fluctuation control range; The fine adjustment module determines the fine adjustment power value of the energy storage system according to the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system, using the fine adjustment value control algorithm to improve the accuracy of the energy storage system to smooth the total output power of the new energy energy storage system.

2. The method for smoothing the output of a new energy energy storage system according to claim 1, characterized in that, the coarse adjustment value calculation method includes: The value of the coarse adjustment fluctuation control range is based on the maximum allowable fluctuation ratio in each application scenario.

3. The method for smoothing the output of a new energy energy storage system according to claim 1, characterized in that, the fine adjustment value control algorithm includes: Determine the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system; Process the difference through a first-order filtering algorithm, a second-order filtering algorithm or a PID algorithm to obtain the fine adjustment power value.

4. The method for smoothing the output of a new energy energy storage system according to claim 1, characterized in that, further includes: The total output power of the new energy energy storage system is obtained through the following formula: Where: is the output power of the energy storage system; is the predicted power of the new energy power generation system; is the real-time power of the new energy power generation system; is the total output power of the new energy energy storage system; Set value for the coarse adjustment fluctuation control range; is the transfer function of the control algorithm, and the control algorithm is a first-order filtering algorithm, a second-order filtering algorithm or a PID algorithm.

5. The method for smoothing the output of a new energy energy storage system according to claim 1, characterized in that, further includes: The current state includes a normal state, an abnormal state and a fault state; Determining whether the energy storage system can be enabled according to the current state of the energy storage system collected by the real-time acquisition system includes: If the current state is a normal state, enter the allowable smoothing compensation mode; If the current state is an abnormal state, enter the pause and repair mode; If the current state is a fault state, enter the prohibited smoothing compensation mode.

6. The method for smoothing the output of a new energy energy storage system according to claim 5, characterized in that, further includes: The prohibited smoothing compensation mode includes: The energy storage system does not output power, and the grid connection point of the new energy power generation system directly outputs the real-time power of the new energy power generation; The fault status includes battery system faults of the energy storage system, PCS faults of the energy storage converter, severe faults of the energy storage environmental control system, and fire protection system faults.

7. The method for smoothing the output of a new energy energy storage system according to claim 5, wherein, it further includes: The allowed smoothing compensation mode includes: The new energy power generation prediction platform outputs the predicted power of the new energy power generation within the current time period; The real-time acquisition system outputs the real-time power of the new energy power generation; The coarse adjustment module determines the coarse adjustment power value of the energy storage system according to the predicted power to improve the response speed of the energy storage system to smooth the total output power of the new energy energy storage system; The fine adjustment module determines the fine adjustment power value of the energy storage system according to the difference between the real-time power and the predicted power of the new energy power generation system using the fine adjustment value control algorithm to improve the accuracy of the energy storage system to smooth the total output power of the new energy energy storage system; Based on the coarse adjustment power value and the fine adjustment power value, the output power of the energy storage system is calculated in real time. If the calculated output power is positive, the energy storage system discharges. If the calculated output power is negative, the energy storage system is charged.

8. The method for smoothing the output of a new energy energy storage system according to claim 7, wherein, it further includes: According to the calculated output power and the current state of charge collected by the real-time acquisition system, it is judged whether the energy storage system has the charging condition and the discharging condition, where: If the output power is positive and the current state of charge is less than the low threshold, the discharging condition is not available; If the output power is negative and the current state of charge is greater than the high threshold, the charging condition is not available; Otherwise, the energy storage system has the charging condition and the discharging condition, and the real-time power of the new energy power generation system and the output power of the energy storage system constitute the total output power at the grid connection point; When the energy storage system does not have the charging condition or the discharging condition, the new energy power generation system directly outputs the real-time power of the new energy power generation at the grid connection point.

9. An output smoothing system for a new energy energy storage system, the new energy energy storage system includes a new energy power generation system and an energy storage system, wherein, it includes: A real-time acquisition system, configured to perform the following actions: Collect the current state of the energy storage system; Collect the real-time power of the new energy power generation system; Collect the current state of charge of the energy storage system; An enabling judgment module, configured to judge whether the energy storage system can be enabled according to the current state of the energy storage system collected by the real-time acquisition system. If so, enable the data processing module to perform the subsequent process, otherwise end; A data processing module, configured to calculate the output power of the energy storage system in real time according to the real-time power; and A condition judgment module, configured to perform the following actions: Judge whether the energy storage system has the charging condition or the discharging condition according to the calculated output power of the energy storage system and the current state of charge of the energy storage system collected by the real-time acquisition system; If so, enable the new energy power generation system to charge the energy storage system or enable the energy storage system to discharge, otherwise end; wherein the real-time acquisition system, the enabling judgment module, the data processing module, and the condition judgment module perform the above processes in real time and in a loop; wherein determining the output power of the energy storage system in real time according to the real-time power includes: The coarse adjustment module determines the coarse adjustment power value of the energy storage system according to the set coarse adjustment value calculation method, so as to improve the response speed of the energy storage system to smooth the total output power of the new energy storage system, where the coarse adjustment power value of the energy storage system is equal to the product of the predicted power of the new energy power generation system and the set value of the coarse adjustment fluctuation control range; The fine adjustment module determines the fine adjustment power value of the energy storage system according to the difference between the real-time power of the new energy power generation system and the predicted power of the new energy power generation system, and uses the fine adjustment value control algorithm to improve the accuracy of the energy storage system to smooth the total output power of the new energy storage system.

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