Start control method, system and equipment of energy storage system and medium

Abstract

The invention belongs to the field of energy storage, and particularly provides a start control method, system, equipment and medium for an energy storage system, and the method comprises the following steps: 1, obtaining the real-time operation parameters of a power grid corresponding to a target energy storage system and the state parameters of an energy storage device in the target energy storage system in a preset monitoring period; 2, constructing a starting state evaluation index according to the real-time operation parameters of the power grid and the state parameters of the energy storage device; 3, when the starting state evaluation index meets the starting condition of the energy storage device, making a charging and discharging strategy according to the state parameters of the energy storage device in the target energy storage system; step 4, performing start control on the target energy storage system according to the charging and discharging strategy; according to the invention, on the basis of timely responding to the frequency and voltage change of the power grid, the optimal management of the optimized use energy of the energy storage device can be realized.

Description

Technical Field

[0001] The present embodiment relates to the field of power systems and control technologies, and in particular to a startup control method, system, device, and medium for an energy storage system. Background Art

[0002] Energy storage systems usually refer to energy storage systems / devices that are directly connected to the high-voltage AC grid, so that they can quickly respond to changes in grid frequency and voltage and provide necessary adjustments to maintain grid stability. Energy storage systems can flexibly absorb or release energy according to grid demand, enhancing the grid's ability to adapt to the volatility of renewable energy. The startup of energy storage systems, how to choose the best startup time and how to control the operating power have become urgent issues to be solved.

[0003] In the prior art, a startup control strategy is usually formulated based on the initial state of the energy storage device in the energy storage system, but this control strategy is difficult to respond to frequency and voltage changes of the power grid in a timely manner. Summary of the invention

[0004] The purpose of the present invention is to provide a startup control method, system, device and medium for an energy storage system, which solves the defect that the startup control strategy formulated by the initial state of the energy storage device in the existing energy storage system is difficult to respond promptly to the frequency and voltage changes of the power grid.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is: The startup control method of the energy storage system provided by the present invention comprises the following steps: The following steps are involved: Step 1, within a predetermined monitoring period, obtaining real-time operating parameters of the power grid corresponding to the target energy storage system and state parameters of the energy storage device in the target energy storage system, wherein the real-time operating parameters of the power grid include power grid voltage parameters and power grid load parameters; the state parameters of the energy storage device include available capacity, internal resistance and operating voltage of the energy storage device; Step 2, constructing a startup status evaluation index according to the real-time operation parameters of the power grid and the status parameters of the energy storage device, including: Calculate the grid voltage fluctuation amplitude according to the grid voltage parameters; Calculate the grid load change rate according to the grid load parameters; Based on the grid voltage fluctuation amplitude, grid load change rate, available capacity and internal resistance of the energy storage device, a startup evaluation index is constructed; Step 3: when the startup state evaluation index meets the startup condition of the energy storage device, a charging and discharging strategy is formulated according to the state parameters of the energy storage device in the target energy storage system; Step 4: Start and control the target energy storage system according to the charging and discharging strategy.

[0006] Preferably, in step 3, a charging and discharging strategy is formulated according to the state parameters of the energy storage device in the target energy storage system, and the specific method is: Calculate theoretical charge and discharge power; According to the theoretical charge and discharge power, combined with the internal resistance and working voltage of the energy storage device, calculate the internal resistance loss power of the energy storage device; Estimating the charge and discharge power of the energy storage device according to the theoretical charge and discharge power and the internal resistance loss power; The charging and discharging strategy of the energy storage device is formulated according to the obtained charging and discharging power.

[0007] Preferably, in step 3, the startup state evaluation index satisfies the startup condition of the energy storage device, and the specific method is:

[0008] in, Indicates the start-up threshold of the energy storage device; Indicates the startup status evaluation index.

[0009] Preferably, the startup status evaluation index is calculated by the following formula:

[0010] in, represents the influence function of voltage fluctuation, represents the influence function of load change, represents the influence function of the available capacity of the energy storage device, represents the influence function of the internal resistance of the energy storage device; is the voltage fluctuation amplitude of the power grid; is the grid load change rate; is the available capacity of the energy storage device; is the internal resistance of the energy storage device.

[0011] Preferably, in step 3, a charging and discharging strategy is formulated according to the state parameters of the energy storage device in the target energy storage system, and the specific method is: Calculate theoretical charge and discharge power; According to the theoretical charge and discharge power, combined with the internal resistance and working voltage of the energy storage device, calculate the internal resistance loss power of the energy storage device; Estimating the charge and discharge power of the energy storage device according to the theoretical charge and discharge power and the internal resistance loss power; Formulate a charging and discharging strategy for the energy storage device based on the obtained charging and discharging power; In step 3, the startup state evaluation index satisfies the startup conditions of the energy storage device, and the specific method is:

[0012] in, Indicates the start-up threshold of the energy storage device; Indicates the startup status evaluation index.

[0013] Preferably, in step 3, a charging and discharging strategy is formulated according to the state parameters of the energy storage device in the target energy storage system, and the specific method is: Calculate theoretical charge and discharge power; According to the theoretical charge and discharge power, combined with the internal resistance and working voltage of the energy storage device, calculate the internal resistance loss power of the energy storage device; Estimating the charge and discharge power of the energy storage device according to the theoretical charge and discharge power and the internal resistance loss power; Formulate a charging and discharging strategy for the energy storage device based on the obtained charging and discharging power; In step 3, the startup state evaluation index satisfies the startup conditions of the energy storage device, and the specific method is:

[0014] in, Indicates the start-up threshold of the energy storage device; Indicates the startup status assessment index; The startup status assessment index is calculated by the following formula:

[0015] in, represents the influence function of voltage fluctuation, represents the influence function of load change, represents the influence function of the available capacity of the energy storage device, represents the influence function of the internal resistance of the energy storage device; is the voltage fluctuation amplitude of the power grid; is the grid load change rate; is the available capacity of the energy storage device; is the internal resistance of the energy storage device.

[0016] A startup control system for an energy storage system, comprising: A parameter acquisition unit, used to acquire, within a predetermined monitoring period, real-time operating parameters of the power grid corresponding to the target energy storage system and state parameters of the energy storage device in the target energy storage system, wherein the real-time operating parameters of the power grid include power grid voltage parameters and power grid load parameters; and the state parameters of the energy storage device include available capacity, internal resistance and operating voltage of the energy storage device; The evaluation index construction unit constructs a startup status evaluation index according to the real-time operation parameters of the power grid and the status parameters of the energy storage device, including: Calculate the grid voltage fluctuation amplitude according to the grid voltage parameters; Calculate the grid load change rate according to the grid load parameters; Based on the grid voltage fluctuation amplitude, grid load change rate, available capacity and internal resistance of the energy storage device, a startup evaluation index is constructed; A strategy formulation unit, used to formulate a charging and discharging strategy according to the state parameters of the energy storage device in the target energy storage system when the startup state evaluation index meets the startup condition of the energy storage device; A start-up control unit is used to start and control the target energy storage system according to the charge and discharge strategy when the start-up state evaluation index meets the start-up condition of the energy storage device.

[0017] A computer device comprising: a processor suitable for executing a computer program; A computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the method described is performed.

[0018] A computer-readable storage medium stores a computer program, and the method described when the computer program is executed by a processor.

[0019] A computer program product comprises a computer program, wherein the computer program implements the method when executed by a processor.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a startup control method for an energy storage system, which evaluates the startup conditions and timing of the energy storage device according to the real-time operation parameters of the power grid and the state parameters of the energy storage device, and formulates a charging and discharging strategy according to the state parameters of the energy storage device when the energy storage device meets the startup conditions, fully considering the influence of the real-time operation parameters of the power grid and the state parameters of the energy storage device on the startup timing, so as to achieve optimal management of the optimized use of energy of the energy storage device on the basis of timely responding to changes in the frequency and voltage of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0022] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0023] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0024] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0025] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0026] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0027] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0028] Based on the above situation of the prior art, the purpose of this embodiment is to provide a startup control method for an energy storage system, which evaluates the startup timing through the real-time operating parameters of the power grid and the state parameters of the energy storage device, and formulates a charging and discharging strategy according to the state parameters of the energy storage device, so as to achieve optimal management of the optimized use of energy of the energy storage device on the basis of timely responding to changes in power grid frequency and voltage.

[0029] This embodiment provides a startup control method for an energy storage system, the system comprising an energy storage device and a power conversion device (PCS), the energy storage device being connected to a power grid via the power conversion device (PCS); the method comprising the following steps: Step 1, within a predetermined monitoring period, obtaining real-time operating parameters of the power grid and state parameters of the energy storage device, wherein the real-time operating parameters of the power grid include power grid voltage parameters and power grid load parameters; the state parameters of the energy storage device include available capacity, internal resistance and operating voltage of the energy storage device; Step 2, constructing a startup status evaluation index according to the real-time operation parameters of the power grid and the status parameters of the energy storage device; Step 3, when the startup state evaluation index meets the startup condition of the energy storage device, a charging and discharging strategy is formulated according to the state parameters of the energy storage device; Step 4: Start and control the energy storage system according to the charging and discharging strategy.

[0030] Example 2 Based on Example 1, this embodiment provides a startup control method for an energy storage system. In step 2, a startup status evaluation index is constructed according to the real-time operation parameters of the power grid and the status parameters of the energy storage device. The specific method is: Calculate the grid voltage fluctuation amplitude based on grid voltage parameters ; Calculate the grid load change rate based on grid load parameters ; Based on the grid voltage fluctuation amplitude, grid load change rate, and available capacity of the energy storage device and internal resistance , build a startup assessment index :

[0031] in, represents the influence function of voltage fluctuation, represents the influence function of load change, represents the influence function of the available capacity of the energy storage device, Represents the influence function of the internal resistance of the energy storage device.

[0032] The voltage fluctuation influence function It is expressed as:

[0033] in, Indicates the voltage fluctuation amplitude of the power grid. Indicates the highest voltage during the monitoring period.

[0034] The load change influence function It is expressed as:

[0035] in, Indicates the fluctuation amplitude of power grid load. Indicates the maximum allowable value of grid load fluctuation.

[0036] The influence function of the available capacity of the energy storage device It is expressed as:

[0037] in, Indicates the available capacity of the energy storage device, Indicates the total capacity of the energy storage device.

[0038] The influence function of the internal resistance of the energy storage device It is expressed as:

[0039] in, represents the internal resistance of the energy storage device, Indicates the internal resistance sensitivity coefficient, which is used to adjust the sensitivity of the internal resistance to the startup effect.

[0040] Example 3 Based on Example 1, this embodiment provides a startup control method for an energy storage system. In step 3, the startup condition of the energy storage device includes a startup evaluation index. Requirements:

[0041] in, Indicates the energy storage device startup threshold.

[0042] In step 3, a charging and discharging strategy is formulated according to the state parameters of the energy storage device. The specific method is: Calculate theoretical charging and discharging power based on the real-time power demand of the power grid; Calculate the internal resistance power loss of the energy storage device according to the internal resistance and working voltage of the energy storage device; Estimating the charge and discharge power of the energy storage device according to the theoretical charge and discharge power and the internal resistance loss power; The charging and discharging strategy of the energy storage device is formulated according to the obtained charging and discharging power.

[0043] The theoretical charge and discharge power is calculated according to the following formula:

[0044] in, Indicates the theoretical charge and discharge power, Indicates the real-time power demand of the power grid, Indicates the response time of the energy storage device.

[0045] The internal resistance power loss is calculated according to the following formula:

[0046] in, Indicates the internal resistance power loss, Indicates the working voltage of the energy storage device, Represents the internal resistance of the energy storage device.

[0047] The charge and discharge power is calculated according to the following formula:

[0048] in, Indicates the charging efficiency or discharging efficiency of the energy storage device.

[0049] In summary, this embodiment provides a startup control method for an energy storage system, which evaluates the startup conditions of the energy storage device according to the real-time operation parameters of the power grid and the state parameters of the energy storage device. When the energy storage device meets the startup conditions, a charging and discharging strategy is formulated according to the state parameters of the energy storage device, and the influence of the real-time operation parameters of the power grid and the state parameters of the energy storage device on the startup timing is fully considered, so that the optimal management of the optimized use of energy of the energy storage device can be achieved on the basis of timely responding to the changes in the frequency and voltage of the power grid.

[0050] Example 4 This embodiment provides a startup control method for an energy storage system. The energy storage system includes at least an energy storage device and a power conversion device (PCS). The energy storage device is connected to a power grid through the power conversion device (PCS). Figure 1 A flowchart of the startup control method of the energy storage system provided in this embodiment is shown in FIG. Figure 1 As shown, the control method includes the following steps: S1. Within a predetermined monitoring period, obtain the real-time operation parameters of the power grid and the state parameters of the energy storage device. The real-time operation parameters of the power grid include the power grid voltage parameters and the power grid load parameters. The state parameters of the energy storage device include the available capacity, internal resistance and working voltage of the energy storage device. The power grid voltage parameters at least include the real-time power grid voltage within the monitoring period. , Maximum grid voltage , and the minimum grid voltage The grid load parameters at least include the real-time grid load within the monitoring period. The monitoring cycle can be set according to the actual operation and demand of the power grid. Generally speaking, it is necessary to adjust the monitoring cycle according to the operation characteristics and fluctuations of the power grid, such as frequency fluctuations and load changes, to ensure that key changes are captured in time. In addition, since the energy storage system needs to respond quickly to changes in grid demand, the monitoring cycle should usually be shorter than the system response time.

[0051] S2. Construct a startup status evaluation index based on the real-time operation parameters of the power grid and the status parameters of the energy storage device. The startup status evaluation index can be constructed according to the following steps: S21. Calculate the grid voltage fluctuation amplitude based on grid voltage parameters :

[0052] in, Indicates the highest voltage during the monitoring period. Indicates the lowest voltage during the monitoring period.

[0053] S22. Calculate the grid load change rate based on grid load parameters :

[0054] Among them, the subscript and Represent adjacent sampling time points respectively. and Indicates the real-time load of the power grid at adjacent sampling time points.

[0055] S23, based on the voltage fluctuation amplitude of the power grid , Grid load change rate , Available capacity of energy storage device and the internal resistance of the energy storage device , build a startup assessment index :

[0056] in, represents the influence function of voltage fluctuation, represents the influence function of load change, represents the influence function of the available capacity of the energy storage device, Represents the influence function of the internal resistance of the energy storage device.

[0057] This embodiment constructs a startup evaluation index by using four different influence functions, each of which reflects the influence of a corresponding parameter on the startup of the energy storage device, thereby achieving an accurate judgment on the actual startup of the energy storage device.

[0058] Voltage fluctuation influence function It is expressed as:

[0059] in, Indicates the voltage fluctuation amplitude of the power grid. Indicates the highest voltage during the monitoring period. near hour, Close to 0, it means that the energy storage device needs to be started as soon as possible to stabilize the voltage; Very small, close to 0, A value close to 1 indicates that the urgency of starting the energy storage device is low.

[0060] Impact function of load change It is expressed as:

[0061] in, Indicates the fluctuation amplitude of power grid load. Indicates the maximum permissible value of grid load fluctuation. The greater the load change, The larger the value is, the more urgent it is to start the energy storage device.

[0062] Influence function of available capacity of energy storage device It is expressed as:

[0063] in, Indicates the available capacity of the energy storage device, Indicates the total capacity of the energy storage device. Near 0 o'clock, Close to 1, it means that the energy storage device urgently needs energy; when the available capacity of the energy storage device Close to the total capacity of the energy storage device hour, Close to 0, it means that the demand for starting the energy storage device is not urgent.

[0064] Influence function of internal resistance of energy storage device It is expressed as:

[0065] in, represents the internal resistance of the energy storage device, Indicates the internal resistance sensitivity coefficient, which is used to adjust the sensitivity of the internal resistance to the start-up effect. Smaller, indicating lower internal resistance and higher efficiency of the battery. Close to 0, it means that the demand for starting the energy storage device is low; when the internal resistance of the energy storage device Larger, indicating that the battery internal resistance is higher and the efficiency is lower. Close to 1, it means that the demand for energy storage device activation is high.

[0066] S3. When the startup status evaluation index meets the startup conditions of the energy storage device, a charging and discharging strategy is formulated according to the state parameters of the energy storage device. To determine whether the startup status evaluation index meets the energy storage device startup conditions. As the product of these influence functions, the larger its value, the faster the energy storage device needs to respond to grid demand. When the startup status evaluation index meets the startup conditions of the energy storage device, the startup threshold It can be determined according to the specific requirements of the power grid and energy storage device. The charging and discharging strategy can be formulated according to the state parameters of the energy storage device through the following steps: S31. Calculate theoretical charging and discharging power according to the real-time power demand of the power grid.

[0067] The real-time power demand of the power grid can be determined by monitoring the real-time operating parameters of the power grid. For example, the real-time power demand of the power grid can be determined by considering the requirements of frequency regulation, voltage support or load balancing. The theoretical charging and discharging power can be calculated according to the following formula:

[0068] in, Indicates the theoretical charge and discharge power, Indicates the real-time power demand of the power grid, Indicates the response time of the energy storage device. Response time The response time refers to the time required for the energy storage device to start charging and discharging operations from the time it receives the start-up demand signal. It is usually related to factors such as detection and signal processing time, control system response time, battery pack activation time (the time required for the battery pack to switch from sleep or standby state to working state), charging and discharging equipment startup time (including the time required for power equipment such as inverters to start from startup to stable output). The response time can be calculated by adding up the above-mentioned time parts and adding a certain safety time or redundancy time. Make a simple estimate; you can also set the response time based on historical data analysis .

[0069] S32. Calculate the internal resistance power loss of the energy storage device based on the internal resistance and operating voltage of the energy storage device. The internal resistance of the energy storage device will cause power loss. Considering this part of the power loss can achieve more accurate power control. The internal resistance power loss can be calculated according to the following formula:

[0070] in, Indicates the internal resistance power loss, Indicates the working voltage of the energy storage device, Represents the internal resistance of the energy storage device.

[0071] S33, estimating the charge and discharge power of the energy storage device based on the theoretical charge and discharge power and the internal resistance loss power. Considering the charge and discharge efficiency of the battery in the energy storage device , charge and discharge efficiency Usually affects the actual available power. Here the charging and discharging efficiency It can be the charging efficiency of the battery in the energy storage device, or it can be the discharging efficiency of the battery in the energy storage device. It is determined by charging or discharging the energy storage device according to the actual startup situation. The charging and discharging power is adjusted based on the efficiency and loss. The adjusted charging and discharging power can be calculated according to the following formula:

[0072] in, Indicates the charging efficiency or discharging efficiency of the energy storage device.

[0073] S4. Start and control the energy storage system according to the above charging and discharging strategy. The charging and discharging power obtained according to the above charging and discharging strategy can be the charging power of the energy storage device or the discharging power of the energy storage device. According to the actual startup situation, the energy storage device needs to be charged or discharged to determine the power, and the corresponding charging or discharging parameters can be used for calculation.

[0074] Example 5 This embodiment provides a startup control system for an energy storage system, including: The parameter acquisition unit is used to acquire the real-time operation parameters of the target energy storage system corresponding to the power grid and the state parameters of the energy storage device in the target energy storage system within a predetermined monitoring period, wherein: the real-time operation parameters of the power grid include the power grid voltage parameters and the power grid load parameters, and the state parameters of the energy storage device include the available capacity, internal resistance and working voltage of the energy storage device. The power grid voltage parameters at least include the real-time voltage of the power grid within the monitoring period. , Maximum grid voltage , and the minimum grid voltage The grid load parameters at least include the real-time grid load within the monitoring period. wait.

[0075] The evaluation index construction unit constructs a startup status evaluation index according to the real-time operation parameters of the power grid and the status parameters of the energy storage device. The construction of the startup status evaluation index can be based on the following steps: Calculate the grid voltage fluctuation amplitude based on grid voltage parameters :

[0076] in, Indicates the highest voltage during the monitoring period. Indicates the lowest voltage during the monitoring period.

[0077] Calculate the grid load change rate based on grid load parameters :

[0078] Among them, the subscript and Represent adjacent sampling time points respectively. and Indicates the real-time load of the power grid at adjacent sampling time points.

[0079] Based on the voltage fluctuation amplitude of the power grid , Grid load change rate , Available capacity of energy storage device and the internal resistance of the energy storage device , build a startup assessment index :

[0080] in, represents the influence function of voltage fluctuation, represents the influence function of load change, represents the influence function of the available capacity of the energy storage device, Represents the influence function of the internal resistance of the energy storage device.

[0081] Voltage fluctuation influence function It is expressed as:

[0082] in, Indicates the voltage fluctuation amplitude of the power grid. Indicates the highest voltage during the monitoring period. near hour, Close to 0, it means that the energy storage device needs to be started as soon as possible to stabilize the voltage; Very small, close to 0, A value close to 1 indicates that the urgency of starting the energy storage device is low.

[0083] Impact function of load change It is expressed as:

[0084] in, Indicates the fluctuation amplitude of power grid load. Indicates the maximum permissible value of grid load fluctuation. The greater the load change, The larger the value is, the more urgent it is to start the energy storage device.

[0085] Influence function of available capacity of energy storage device It is expressed as:

[0086] in, Indicates the available capacity of the energy storage device, Indicates the total capacity of the energy storage device. Near 0 o'clock, Close to 1, it means that the energy storage device urgently needs energy; when the available capacity of the energy storage device Close to the total capacity of the energy storage device hour, Close to 0, it means that the demand for starting the energy storage device is not urgent.

[0087] Influence function of internal resistance of energy storage device It is expressed as:

[0088] in, represents the internal resistance of the energy storage device, Indicates the internal resistance sensitivity coefficient, which is used to adjust the sensitivity of the internal resistance to the start-up effect. Smaller, indicating lower internal resistance and higher efficiency of the battery. Close to 0, it means that the demand for starting the energy storage device is low; when the internal resistance of the energy storage device Larger, indicating that the battery internal resistance is higher and the efficiency is lower. Close to 1, it means that the demand for energy storage device activation is high.

[0089] The strategy formulation unit is used to formulate a charging and discharging strategy according to the state parameters of the energy storage device in the target energy storage system when the startup state evaluation index meets the startup condition of the energy storage device, wherein: Calculate the theoretical charging and discharging power based on the real-time power demand of the power grid.

[0090] The real-time power demand of the power grid can be determined by monitoring the real-time operating parameters of the power grid. For example, the real-time power demand of the power grid can be determined by considering the requirements of frequency regulation, voltage support or load balancing. The theoretical charging and discharging power can be calculated according to the following formula:

[0091] in, Indicates the theoretical charge and discharge power, Indicates the real-time power demand of the power grid, Indicates the response time of the energy storage device. Response time The response time refers to the time required for the energy storage device to start charging and discharging operations from the time it receives the start-up demand signal. It is usually related to factors such as detection and signal processing time, control system response time, battery pack activation time (the time required for the battery pack to switch from sleep or standby state to working state), charging and discharging equipment startup time (including the time required for power equipment such as inverters to start from startup to stable output). The response time can be calculated by adding up the above-mentioned time parts and adding a certain safety time or redundancy time. Make a simple estimate; you can also set the response time based on historical data analysis .

[0092] According to the internal resistance and working voltage of the energy storage device, calculate the internal resistance power loss of the energy storage device. The internal resistance of the energy storage device will cause power loss. Considering this part of power loss can achieve more accurate power control. The internal resistance power loss can be calculated according to the following formula:

[0093] in, Indicates the internal resistance power loss, Indicates the working voltage of the energy storage device, Represents the internal resistance of the energy storage device.

[0094] Estimate the charging and discharging power of the energy storage device based on the theoretical charging and discharging power and the internal resistance loss power. Consider the charging and discharging efficiency of the battery in the energy storage device , charge and discharge efficiency Usually affects the actual available power. Here the charging and discharging efficiency It can be the charging efficiency of the battery in the energy storage device, or it can be the discharging efficiency of the battery in the energy storage device. It is determined by charging or discharging the energy storage device according to the actual startup situation. The charging and discharging power is adjusted based on the efficiency and loss. The adjusted charging and discharging power can be calculated according to the following formula:

[0095] in, Indicates the charging efficiency or discharging efficiency of the energy storage device.

[0096] A start-up control unit is used to start and control the target energy storage system according to the charge and discharge strategy when the start-up state evaluation index meets the start-up condition of the energy storage device.

[0097] Example 6 This embodiment 6 provides a computer device, including: a memory for storing a computer program; and a processor for implementing the steps of a computer method when executing the computer program.

[0098] When the processor executes the computer program, the steps of the above computer method are implemented.

[0099] Alternatively, when the processor executes the computer program, the functions of each module in the above system are realized. The computer device may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The computer device may include, but is not limited to, a processor and a memory. Those skilled in the art will appreciate that the above are examples of computer devices and do not constitute a limitation on computer devices. The computer device may include more components than the above, or a combination of certain components, or different components. For example, the computer device may also include input and output devices, network access devices, buses, etc.

[0100] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the computer device, and uses various interfaces and lines to connect various parts of the entire computer device.

[0101] The memory may be used to store the computer programs and / or modules, and the processor implements various functions of the computer device by running or executing the computer programs and / or modules stored in the memory and calling the data stored in the memory.

[0102] The memory may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area may store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (SecureDigital, SD) card, a flash card (FlashCard), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0103] Example 7 This embodiment 7 also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the method described are implemented.

[0104] If the module / unit integrated in the computer system is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0105] Based on such understanding, the present invention implements all or part of the processes in the above method, and can also be completed by instructing related hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above computer method can be implemented. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or preset intermediate form, etc.

[0106] The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0107] It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable storage media do not include electrical carrier signals and telecommunication signals.

[0108] Example 8 This embodiment 8 provides a computer product, which includes a computer program, and the computer program is stored in a computer-readable storage medium; the processor of the computer device reads the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device can execute the method in embodiment 1, which will not be repeated here.

[0109] It should be noted that a person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing related hardware through a computer program. The program can be stored in a computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above-mentioned methods.

[0110] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A startup control method for an energy storage system, characterized in that: The following steps are involved: Step 1, within a predetermined monitoring period, obtaining real-time operating parameters of the power grid corresponding to the target energy storage system and state parameters of the energy storage device in the target energy storage system, wherein the real-time operating parameters of the power grid include power grid voltage parameters and power grid load parameters; the state parameters of the energy storage device include available capacity, internal resistance and operating voltage of the energy storage device; Step 2, constructing a startup status evaluation index according to the real-time operation parameters of the power grid and the status parameters of the energy storage device, including: Calculate the grid voltage fluctuation amplitude according to the grid voltage parameters; Calculate the grid load change rate according to the grid load parameters; Based on the grid voltage fluctuation amplitude, grid load change rate, available capacity and internal resistance of the energy storage device, a startup evaluation index is constructed; Step 3: when the startup state evaluation index meets the startup condition of the energy storage device, a charging and discharging strategy is formulated according to the state parameters of the energy storage device in the target energy storage system; Step 4: Start and control the target energy storage system according to the charging and discharging strategy.

2. A startup control method for an energy storage system according to claim 1, characterized in that: In step 3, a charging and discharging strategy is formulated according to the state parameters of the energy storage device in the target energy storage system. The specific method is: Calculate theoretical charge and discharge power; According to the theoretical charge and discharge power, combined with the internal resistance and working voltage of the energy storage device, calculate the internal resistance loss power of the energy storage device; Estimating the charge and discharge power of the energy storage device according to the theoretical charge and discharge power and the internal resistance loss power; The charging and discharging strategy of the energy storage device is formulated according to the obtained charging and discharging power.

3. The startup control method of an energy storage system according to claim 1, characterized in that: In step 3, the startup state evaluation index satisfies the startup conditions of the energy storage device, and the specific method is: in, Indicates the start-up threshold of the energy storage device; Indicates the startup status evaluation index.

4. A startup control method for an energy storage system according to claim 3, characterized in that: The startup status assessment index is calculated by the following formula: in, represents the influence function of voltage fluctuation, represents the influence function of load change, represents the influence function of the available capacity of the energy storage device, represents the influence function of the internal resistance of the energy storage device; is the voltage fluctuation amplitude of the power grid; is the grid load change rate; is the available capacity of the energy storage device; is the internal resistance of the energy storage device.

5. The startup control method of an energy storage system according to claim 1, characterized in that: In step 3, a charging and discharging strategy is formulated according to the state parameters of the energy storage device in the target energy storage system. The specific method is: Calculate theoretical charge and discharge power; According to the theoretical charge and discharge power, combined with the internal resistance and working voltage of the energy storage device, calculate the internal resistance loss power of the energy storage device; Estimating the charge and discharge power of the energy storage device according to the theoretical charge and discharge power and the internal resistance loss power; Formulate a charging and discharging strategy for the energy storage device based on the obtained charging and discharging power; In step 3, the startup state evaluation index satisfies the startup conditions of the energy storage device, and the specific method is: in, Indicates the start-up threshold of the energy storage device; Indicates the startup status evaluation index.

6. A startup control method for an energy storage system according to claim 1, characterized in that: In step 3, a charging and discharging strategy is formulated according to the state parameters of the energy storage device in the target energy storage system. The specific method is: Calculate theoretical charge and discharge power; According to the theoretical charge and discharge power, combined with the internal resistance and working voltage of the energy storage device, calculate the internal resistance loss power of the energy storage device; Estimating the charge and discharge power of the energy storage device according to the theoretical charge and discharge power and the internal resistance loss power; Formulate a charging and discharging strategy for the energy storage device based on the obtained charging and discharging power; In step 3, the startup state evaluation index satisfies the startup conditions of the energy storage device, and the specific method is: in, Indicates the start-up threshold of the energy storage device; Indicates the startup status assessment index; The startup status assessment index is calculated by the following formula: in, represents the influence function of voltage fluctuation, represents the influence function of load change, represents the influence function of the available capacity of the energy storage device, represents the influence function of the internal resistance of the energy storage device; is the voltage fluctuation amplitude of the power grid; is the grid load change rate; is the available capacity of the energy storage device; is the internal resistance of the energy storage device.

7. A startup control system for an energy storage system, characterized in that: include: A parameter acquisition unit, used to acquire, within a predetermined monitoring period, real-time operating parameters of the power grid corresponding to the target energy storage system and state parameters of the energy storage device in the target energy storage system, wherein the real-time operating parameters of the power grid include power grid voltage parameters and power grid load parameters; and the state parameters of the energy storage device include available capacity, internal resistance and operating voltage of the energy storage device; The evaluation index construction unit constructs a startup status evaluation index according to the real-time operation parameters of the power grid and the status parameters of the energy storage device, including: Calculate the grid voltage fluctuation amplitude according to the grid voltage parameters; Calculate the grid load change rate according to the grid load parameters; Based on the grid voltage fluctuation amplitude, grid load change rate, available capacity and internal resistance of the energy storage device, a startup evaluation index is constructed; A strategy formulation unit, used to formulate a charging and discharging strategy according to the state parameters of the energy storage device in the target energy storage system when the startup state evaluation index meets the startup condition of the energy storage device; A start-up control unit is used to start and control the target energy storage system according to the charge and discharge strategy when the start-up state evaluation index meets the start-up condition of the energy storage device.

8. A computer device, characterized in that: include: a processor suitable for executing a computer program; A computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, and when the computer program is executed by the processor, the method according to any one of claims 1 to 4 is performed.

9. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 4 is implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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