Energy storage system power adaptive compensation method and system oriented to variable load scene

Abstract

The invention discloses an energy storage system power adaptive compensation method and system oriented to a variable load scene, and relates to the technical field of power compensation. The method comprises the following steps: acquiring active power and reactive power information at a grid-connected point of an energy storage system as current operation data; calculating a power factor of the grid-connected point based on the current operation data; judging whether the power factor is lower than a preset threshold interval or not; when the power factor is lower than a preset threshold interval, activating a compensation module, determining a target reactive compensation amount according to the power factor, and setting an actual issuing compensation value in combination with the maximum reactive power of the energy storage system; and generating a compensation instruction according to the actually issued compensation value, sending the compensation instruction to the energy storage converter, and outputting corresponding reactive power by the energy storage converter for compensation. The technical problem of low utilization efficiency of compensation resources caused by difficulty in adaptive power compensation of an energy storage system according to an actual power factor in a variable load scene in the prior art is solved, and the technical effect of improving the reactive power compensation efficiency is achieved.

Description

Technical Field

[0001] The present invention relates to the field of power compensation technology, and in particular to a method and system for adaptive power compensation of an energy storage system for variable load scenarios. Background Art

[0002] In modern power systems, with the increasing proportion of renewable energy access and the increasingly complex characteristics of load-side electricity consumption, grid operations are facing problems such as frequent load fluctuations and power quality fluctuations. Especially in variable load scenarios, unstable power factor can easily lead to operational risks such as uneven reactive power distribution and voltage fluctuations, which in turn affect the safety and economy of the system. As a key resource for grid regulation, energy storage systems not only provide active power support but also have certain reactive power regulation capabilities. However, existing energy storage systems mostly perform reactive power compensation with fixed or preset parameters, lacking accurate perception and response to real-time power factor changes. This results in unsatisfactory compensation effects, low compensation resource utilization efficiency, and may even cause system control mismatch. Summary of the Invention

[0003] This application provides a method and system for adaptive power compensation of energy storage systems for variable load scenarios, which solves the technical problem in the prior art that energy storage systems are difficult to perform adaptive power compensation according to the actual power factor in variable load scenarios, resulting in low compensation resource utilization efficiency.

[0004] In a first aspect of the present application, a method for adaptively compensating power of an energy storage system in a variable load scenario is provided, the method comprising:

[0005] Collect active power and reactive power information at the grid-connected point of the energy storage system as current operating data; calculate the power factor of the grid-connected point based on the current operating data; determine whether the power factor is lower than a preset threshold range; when the power factor is lower than the preset threshold range, activate the compensation module, determine the target reactive compensation amount according to the power factor, and set the actual compensation value in combination with the maximum reactive capacity of the energy storage system; generate a compensation instruction according to the actual compensation value, and send it to the energy storage converter, which outputs the corresponding reactive power for compensation, wherein, when the energy storage device is at the moment of discharge, instantaneous compensation is performed according to the actual compensation value, and when the energy storage device is in a non-instantaneous discharge process, slow rise and fall compensation is performed.

[0006] Furthermore, the current power factor is re-collected according to the set control period; and it is determined whether the re-collected power factor meets the preset threshold range. If it has not recovered to the preset threshold range of the power factor, the compensation instruction is repeatedly updated.

[0007] Furthermore, according to the formula: Calculate the power factor of the grid-connected point, where Pess is the active power of the energy storage device, P L is the active power on the load side, Q ess is the reactive power of the energy storage device, Q L is the reactive power on the load side.

[0008] Furthermore, the preset threshold interval is [0.9, 1.0].

[0009] Furthermore, when the useful power of the energy storage device changes from zero to a negative value within 1 second, and the change exceeds a preset proportion of the rated value, it is determined that the energy storage device is at the moment of discharge, and compensation is performed according to the actual compensation value.

[0010] Furthermore, a minimum step size of reactive power compensation is set as a single increment or decrement; reactive power compensation period adjustment compensation is performed based on the minimum step size until the currently calculated power factor is restored to the preset threshold range; wherein, when The actual compensation value is the actual compensation value plus the minimum step size; when The actual compensation value is the actual issued compensation value minus the minimum step size. After each adjustment, verify whether the actual compensation value meets the maximum reactive power limit of the energy storage system. If it exceeds, adjust the limit according to the maximum reactive power.

[0011] Furthermore, a proportional factor is determined based on the deviation between the current power factor and a preset threshold value interval; the proportional factor is used to perform a proportional calculation on the standard minimum step size to obtain the minimum step size for reactive power compensation, wherein the standard minimum step size is set based on a preset ratio of the device's rated capacity. Furthermore, a target reactive compensation amount is determined based on the deviation between the power factor and the preset threshold value interval; the maximum available reactive output capacity is calculated based on the current power capacity and real-time active output power of the energy storage device; the target reactive compensation amount and the maximum available reactive output capacity are compared, and the smaller value between the two is set as the actual compensation value.

[0012] A second aspect of the present application provides an energy storage system power adaptive compensation system for variable load scenarios, the system comprising:

[0013] Data acquisition unit: collects active power and reactive power information at the grid-connected point of the energy storage system as current operating data; calculation unit: calculates the power factor of the grid-connected point based on the current operating data; judgment unit: judges whether the power factor is lower than the preset threshold range; compensation determination unit: when the power factor is lower than the preset threshold range, activates the compensation module, determines the target reactive compensation amount according to the power factor, and sets the actual issued compensation value in combination with the maximum reactive capacity of the energy storage system; compensation unit: generates a compensation instruction according to the actual issued compensation value, sends it to the energy storage converter, and the energy storage converter outputs the corresponding reactive power for compensation, wherein, when the energy storage is at the moment of discharge, instantaneous compensation is performed according to the actual issued compensation value, and when the energy storage is in a non-instantaneous discharge process, slow rise and fall compensation is performed.

[0014] One or more technical solutions provided in this application have at least the following technical effects or advantages:

[0015] First, the active power and reactive power information at the grid-connected point of the energy storage system is collected as current operating data. Then, based on the current operating data, the power factor of the grid-connected point is calculated; a determination is made as to whether the power factor is below a preset threshold range; when the power factor is below the preset threshold range, the compensation module is activated, the target reactive compensation amount is determined based on the power factor, and the actual compensation value is set in combination with the maximum reactive power of the energy storage system. Finally, a compensation instruction is generated based on the actual compensation value and sent to the energy storage converter, which outputs the corresponding reactive power for compensation. When the energy storage is at the moment of discharge, instantaneous compensation is performed according to the actual compensation value, and when the energy storage is in a non-instantaneous discharge process, slow ramp-up and ramp-down compensation is performed. This solves the technical problem of the prior art that the energy storage system is difficult to perform adaptive power compensation according to the actual power factor in variable load scenarios, resulting in low compensation resource utilization efficiency, and achieves the technical effect of improving reactive power compensation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic flow chart of a method for adaptive power compensation of an energy storage system for a variable load scenario provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of the structure of a power adaptive compensation system for an energy storage system in a variable load scenario provided in an embodiment of the present application.

[0019] Description of the accompanying drawings: data acquisition unit 11, calculation unit 12, judgment unit 13, compensation determination unit 14, compensation unit 15. DETAILED DESCRIPTION

[0020] This application solves the technical problem in the prior art that the energy storage system has difficulty in performing adaptive power compensation according to the actual power factor in variable load scenarios, resulting in low compensation resource utilization efficiency, by providing a power adaptive compensation method and system for the energy storage system in variable load scenarios.

[0021] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0022] It should be noted that the terms "including" and "having" are intended to cover non-exclusive inclusions. For example, a process, method, system, product or server that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or modules that are not clearly listed or are inherent to these processes, methods, products or devices.

[0023] Example 1, as Figure 1 As shown, the present application provides a power adaptive compensation method for an energy storage system in a variable load scenario, wherein the method includes:

[0024] Collect active power and reactive power information at the grid connection point of the energy storage system as current operating data.

[0025] The active power and reactive power at the current moment are synchronously collected through intelligent measuring devices (such as multi-function electricity meters or high-precision electricity collection modules) deployed at the grid-connected interface of the energy storage system. Active power refers to the actual energy power component output to or absorbed from the grid by the energy storage system during grid-connected operation, and the unit is kilowatt (kW); reactive power refers to the non-actual working power component provided or absorbed by the energy storage system in maintaining voltage stability and supporting electromagnetic field energy exchange, and the unit is kilovar (kVar). Specifically, the collection process is carried out periodically at set time intervals, such as every 1 second or shorter periods, to ensure the timeliness and continuity of the operating data. The active power and reactive power data are transmitted to the control processing unit in real time via the data collection module, and are input as current operating data into the subsequent power factor calculation and compensation judgment process, providing a data basis for realizing adaptive power regulation of the energy storage system.

[0026] Based on the current operating data, the power factor of the grid-connected point is calculated.

[0027] Based on the active power and reactive power in the current operating data, the power factor of the grid connection point is calculated to reflect the effectiveness of the energy storage system's current support for grid power.

[0028] Furthermore, the calculation of the power factor at the grid connection point includes:

[0029] According to the formula: Calculate the power factor of the grid-connected point, where P ess is the active power of the energy storage device, P L is the active power on the load side, Q ess is the reactive power of the energy storage device, Q L is the reactive power on the load side.

[0030] After acquiring the real-time operating data of the energy storage system at the grid connection point, the control processing unit will collect the active power P of the energy storage device. ess , active power P on the load side L , reactive power Q of energy storage equipment ess And the reactive power Q on the load side L Perform weighted superposition and substitute into the above power factor calculation formula, where: Indicates the overall power factor of the current grid-connected point, reflecting the energy efficiency level of the grid at that point under actual operating conditions.

[0031] Determine whether the power factor is lower than a preset threshold range.

[0032] Calculate the power factor The calculated results are then compared with a preset threshold range of the system, which is usually set according to the grid operation standard or specific application requirements.

[0033] Furthermore, the preset threshold interval is [0.9, 1.0].

[0034] The preset threshold range is [0.9, 1.0], that is, when the power factor of the grid point When it is less than 0.9, the system determines that the current power quality does not meet the operating requirements, and there is a large proportion of reactive power, which may lead to problems such as increased voltage fluctuations and increased burden on the power grid, and a compensation mechanism needs to be activated; when the power factor is in the range of 0.9 to 1.0, it means that the active power proportion is high and the power utilization efficiency is better. The system maintains normal operating state and no additional adjustment is required.

[0035] When the power factor is lower than the preset threshold range, the compensation module is activated, a target reactive compensation amount is determined according to the power factor, and an actual compensation value is set in combination with the maximum reactive capacity of the energy storage system.

[0036] When the power factor is lower than the preset threshold range (i.e. ), the compensation module will be activated to enter the working state and reactive power compensation will be started.

[0037] Furthermore, determining a target reactive power compensation amount based on the power factor and setting an actual compensation value based on the maximum reactive power of the energy storage system include:

[0038] The target reactive compensation amount is determined based on the deviation between the power factor and the preset threshold interval; the maximum available reactive output capacity is calculated based on the current power capacity and real-time active output power of the energy storage device; the target reactive compensation amount and the maximum available reactive output capacity are compared, and the smaller value between the two is set as the actual compensation value.

[0039] The system calculates the target reactive power compensation Q required to restore the power factor to the target level based on the deviation between the current calculated power factor and the preset threshold range (for example, the lower limit is 0.9). target .

[0040] Target reactive compensation calculation formula:

[0041] Among them, P total =P ess +P L , is the target power factor (i.e., the value within the preset threshold range, which can be any value within the range), Q current =Q ess +Q L is the current total reactive power value.

[0042] Based on the current rated capacity S of the energy storage device rated And the real-time output active power P ess , calculate its maximum available reactive power output capacity Q in the current state according to the trigonometric relationship max , calculation formula: Among them, S rated Indicates the rated apparent power of the energy storage converter, P ess is the actual active output of the current energy storage system.

[0043] The system sets the target reactive compensation amount Q target The maximum available reactive power output capacity Q max Compare the two and take the smaller value as the actual compensation value.

[0044] A compensation instruction is generated according to the actual compensation value and sent to the energy storage converter. The energy storage converter outputs the corresponding reactive power for compensation. When the energy storage device is in the moment of discharge, instantaneous compensation is performed according to the actual compensation value. When the energy storage device is in a non-instantaneous discharge process, slow rise and fall compensation is performed.

[0045] Once the actual compensation value is determined, it is used as a basic parameter to generate standardized compensation instructions. Specifically, the system converts the actual compensation value into a corresponding reactive power setting instruction based on the energy storage converter's communication protocol and control interface format. The compensation instruction is then sent to the energy storage converter via a high-speed communication link (such as Modbus, CAN, Ethernet, etc.). Upon receiving the compensation instruction, the energy storage converter outputs the corresponding reactive power for compensation.

[0046] When the energy storage device is in the moment of discharge, that is, when the load changes significantly or the system enters dynamic operation from static state, the control system immediately performs instantaneous compensation according to the actual compensation value issued, and quickly outputs the target reactive power to cope with the sharp fluctuations in power factor caused by sudden loads, ensuring that the system power quality is not damaged by instantaneous disturbances; and when the energy storage device is in the non-instantaneous discharge process, that is, the stage where the operating state is relatively stable but there is still a need for adjustment, the system starts the slow rise and fall compensation mechanism, and gradually adjusts the reactive power output in stages according to the set compensation step and adjustment period, so that the power factor gradually approaches the target value.

[0047] Furthermore, the compensation instruction is generated, and then the following steps are also included:

[0048] The current power factor is re-collected according to the set control period; and it is determined whether the re-collected power factor meets the preset threshold range. If it has not recovered to the preset threshold range of the power factor, the compensation instruction is repeatedly updated.

[0049] After the compensation instruction is issued and the energy storage converter executes the output of reactive power, the system re-collects the power factor of the grid connection point according to the set control period (for example, every 1 second, every 5 seconds, or according to the system response characteristics) to obtain the current corrected operating status. Subsequently, the re-collected power factor value is judged. If the value is still lower than the preset threshold range (for example, still less than 0.9), it means that the current compensation effect is insufficient and the power factor has not yet been effectively corrected. At this time, the system recalculates the target reactive compensation amount based on the updated active and reactive operating data, and again calculates the actual executable compensation value in combination with the real-time maximum reactive capacity of the energy storage system, and generates a new compensation instruction. The compensation instruction will be sent to the energy storage converter again to adjust its reactive power output and further improve the power factor level.

[0050] Furthermore, when the energy storage device is at the moment of discharge, instantaneous compensation is performed according to the actual compensation value, including:

[0051] When the useful power of the energy storage device changes from zero to a negative value within 1 second, and the change exceeds a preset proportion of the rated value, it is determined that the energy storage device is at the moment of discharge, and compensation is performed according to the actual compensation value.

[0052] The system continuously monitors changes in the active power of the energy storage device. When it detects that the active power rapidly changes from zero to a negative value within 1 second, and the magnitude of the change exceeds a preset threshold (e.g., 10% to 20%) of the energy storage device's rated active power, it determines that the device is currently at the moment of discharge. Once the system confirms that the energy storage device is at this moment of discharge, it directly generates and issues reactive power control instructions based on the actual compensation value calculated, driving the energy storage converter to perform rapid compensation at the target output value.

[0053] Furthermore, when the energy storage is in a non-instantaneous discharge process, a slow rise and fall compensation is performed, including:

[0054] Set the minimum step size of reactive power compensation as a single increment or decrement; adjust the reactive power compensation cycle based on the minimum step size until the currently calculated power factor returns to the preset threshold range; wherein, when The actual compensation value is the actual compensation value plus the minimum step size; when The actual compensation value is the actual issued compensation value minus the minimum step size. After each adjustment, verify whether the actual compensation value meets the maximum reactive power limit of the energy storage system. If it exceeds, adjust the limit according to the maximum reactive power.

[0055] Preferably, a minimum step size of reactive power compensation is set as a single increment or decrement adjustment unit. The minimum step size is set according to factors such as the response characteristics of the energy storage system, the converter regulation capability, and the grid sensitivity, and can be, for example, 1 kVar, 2 kVar, etc.

[0056] when Indicates that the power factor is low but still positive. The system needs to further improve the power factor while maintaining the positive direction. The actual compensation value is set to the current actual compensation value plus the minimum step size to enhance reactive power output. Indicates that the current power factor is zero or negative, and the system power characteristics are seriously abnormal. At this time, it is necessary to significantly reduce the reactive power output. The actual compensation value is set to the current actual compensation value minus the minimum step size to perform the compensation reduction operation.

[0057] After each compensation adjustment, the system verifies the updated actual compensation value to determine whether it exceeds the energy storage system's current maximum reactive power limit. If so, the actual compensation value is adjusted to the maximum output value allowed by the maximum reactive power limit to prevent overload and ensure system safety and reliability.

[0058] Furthermore, the minimum step size of reactive power compensation is set, including:

[0059] A proportional factor is determined based on the deviation of the current power factor from the factor of the preset threshold interval; the proportional factor is used to perform proportional calculation on the standard minimum step to obtain the minimum step of the reactive power compensation, wherein the standard minimum step is set according to a preset proportion of the rated capacity of the equipment.

[0060] First, the system calculates a proportional factor that reflects the urgency of compensation based on the degree of deviation between the current power factor and the preset threshold interval. The proportional factor increases with the increase in the power factor deviation, thereby improving the adjustment response speed. Then, the system sets a standard minimum step size as the basic unit of compensation based on the rated apparent power of the energy storage converter and the preset adjustment ratio. Finally, the standard minimum step size is scaled using the proportional factor to obtain the actual minimum compensation step size value (i.e., minimum step size) under the current working conditions. This minimum step size, as a single incremental or decremental adjustment amount, will be used for periodic reactive power output control in the subsequent compensation process, so that the compensation process has a certain adaptive adjustment capability while maintaining stability, thereby improving the response sensitivity and control accuracy of the entire system under dynamic load changes.

[0061] In summary, the embodiments of the present application have at least the following technical effects:

[0062] First, the active power and reactive power information at the grid connection point of the energy storage system is collected as current operating data. Then, based on the current operating data, the power factor of the grid connection point is calculated; it is determined whether the power factor is lower than the preset threshold range; when the power factor is lower than the preset threshold range, the compensation module is activated, the target reactive compensation amount is determined based on the power factor, and the actual compensation value is set in combination with the maximum reactive power of the energy storage system. Finally, a compensation instruction is generated based on the actual compensation value and sent to the energy storage converter. The energy storage converter outputs the corresponding reactive power for compensation. When the energy storage device is at the moment of discharge, instantaneous compensation is performed according to the actual compensation value. When the energy storage device is in a non-instantaneous discharge process, slow rise and fall compensation is performed. This solves the technical problem of the prior art that the energy storage system is difficult to perform adaptive power compensation according to the actual power factor in variable load scenarios, resulting in low compensation resource utilization efficiency, and achieves the technical effect of improving the efficiency of reactive power compensation.

[0063] The second embodiment is based on the same inventive concept as the power adaptive compensation method of the energy storage system for variable load scenarios in the above embodiment. Figure 2 As shown, the present application provides a power adaptive compensation system for an energy storage system for variable load scenarios, wherein the system includes:

[0064] The data acquisition unit 11 collects active power and reactive power information at the grid-connected point of the energy storage system as current operating data; the calculation unit 12 calculates the power factor of the grid-connected point based on the current operating data; the judgment unit 13 judges whether the power factor is lower than the preset threshold interval; the compensation determination unit 14 activates the compensation module when the power factor is lower than the preset threshold interval, determines the target reactive compensation amount according to the power factor, and sets the actual compensation value in combination with the maximum reactive capacity of the energy storage system; the compensation unit 15 generates a compensation instruction according to the actual compensation value, sends it to the energy storage converter, and the energy storage converter outputs the corresponding reactive power for compensation. When the energy storage device is in the moment of discharge, instantaneous compensation is performed according to the actual compensation value, and when the energy storage device is in the non-instantaneous discharge process, slow rise and fall compensation is performed.

[0065] Furthermore, the compensation unit 15 is configured to perform the following method:

[0066] The current power factor is re-collected according to the set control period; and it is determined whether the re-collected power factor meets the preset threshold range. If it has not recovered to the preset threshold range of the power factor, the compensation instruction is repeatedly updated.

[0067] Furthermore, the compensation unit 15 is configured to perform the following method:

[0068] When the useful power of the energy storage device changes from zero to a negative value within 1 second, and the change exceeds a preset proportion of the rated value, it is determined that the energy storage device is at the moment of discharge, and compensation is performed according to the actual compensation value.

[0069] Furthermore, the compensation unit 15 is configured to perform the following method:

[0070] Set the minimum step size of reactive power compensation as a single increment or decrement; adjust the reactive power compensation cycle based on the minimum step size until the currently calculated power factor returns to the preset threshold range; wherein, when The actual compensation value is the actual compensation value plus the minimum step size; when The actual compensation value is the actual issued compensation value minus the minimum step size. After each adjustment, verify whether the actual compensation value meets the maximum reactive power limit of the energy storage system. If it exceeds, adjust the limit according to the maximum reactive power.

[0071] Furthermore, the compensation unit 15 is configured to perform the following method:

[0072] A proportional factor is determined based on the deviation between the current power factor and a preset threshold value interval; the proportional factor is used to proportionally calculate the standard minimum step size to obtain the minimum step size for reactive power compensation, wherein the standard minimum step size is set based on a preset ratio of the rated capacity of the equipment. Further, the calculation unit 12 is used to perform the following method:

[0073] According to the formula: Calculate the power factor of the grid-connected point, where P ess is the active power of the energy storage device, P L is the active power on the load side, Q ess is the reactive power of the energy storage device, Q L is the reactive power on the load side.

[0074] Furthermore, the judgment unit 13 is configured to execute the following method:

[0075] The preset threshold interval is [0.9, 1.0].

[0076] Furthermore, the control unit 14 is configured to execute the following method:

[0077] The target reactive compensation amount is determined based on the deviation between the power factor and the preset threshold interval; the maximum available reactive output capacity is calculated based on the current power capacity and real-time active output power of the energy storage device; the target reactive compensation amount and the maximum available reactive output capacity are compared, and the smaller value between the two is set as the actual compensation value.

[0078] It should be noted that the order in which the embodiments of the present application are presented is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. Furthermore, the foregoing descriptions of specific embodiments of this specification are provided. The processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0079] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

[0080] This specification and drawings are merely illustrative of the present application and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of this application. Obviously, those skilled in the art may make various modifications and variations to this application without departing from the scope of this application. Thus, this application is intended to include such modifications and variations as fall within the scope of this application and its equivalents.

Claims

1. The power adaptive compensation method of energy storage system for variable load scenarios is characterized by: The method comprises: Collect active power and reactive power information at the energy storage system grid connection point as current operating data; Calculating the power factor of the grid connection point based on the current operating data; Determining whether the power factor is lower than a preset threshold range; When the power factor is lower than the preset threshold range, the compensation module is activated to determine the target reactive power compensation amount according to the power factor, and the actual compensation value is set in combination with the maximum reactive power of the energy storage system; A compensation instruction is generated according to the actual compensation value and sent to the energy storage converter. The energy storage converter outputs the corresponding reactive power for compensation. When the energy storage device is in the moment of discharge, instantaneous compensation is performed according to the actual compensation value. When the energy storage device is in a non-instantaneous discharge process, slow rise and fall compensation is performed.

2. The power adaptive compensation method for energy storage system in variable load scenario according to claim 1 is characterized in that: Generate compensation instructions, followed by: Re-collect the current power factor according to the set control cycle; It is determined whether the re-collected power factor meets the preset threshold range. If it has not recovered to the preset threshold range of the power factor, the compensation instruction is repeatedly updated.

3. The power adaptive compensation method for energy storage system in variable load scenario according to claim 2 is characterized in that: Calculate the power factor of the grid connection point, including: According to the formula: Calculate the power factor of the grid-connected point, where P ess is the active power of the energy storage device, P L is the active power on the load side, Q ess is the reactive power of the energy storage device, Q L is the reactive power on the load side.

4. The power adaptive compensation method for energy storage system in variable load scenario according to claim 3 is characterized in that: The preset threshold interval is [0.9, 1.0].

5. The power adaptive compensation method for energy storage system in variable load scenario according to claim 2 is characterized in that: When the energy storage device is in the process of discharging, instantaneous compensation is performed according to the actual compensation value, including: When the useful power of the energy storage device changes from zero to a negative value within 1 second, and the change exceeds a preset proportion of the rated value, it is determined that the energy storage device is at the moment of discharge, and compensation is performed according to the actual compensation value.

6. The power adaptive compensation method for energy storage system in variable load scenario according to claim 4 is characterized in that: When the energy storage is in a non-instantaneous discharge process, slow rise and fall compensation is performed, including: Set the minimum step size for reactive power compensation as a single increment or decrement; Performing reactive power compensation period adjustment and compensation based on the minimum step size until the currently calculated power factor recovers to the preset threshold range; Among them, when The actual compensation value is the actual compensation value issued plus the minimum step size; when The actual compensation value is the actual compensation value minus the minimum step size; After each adjustment, verify whether the actual compensation value meets the maximum reactive power limit of the energy storage system. If it exceeds, adjust the limit according to the maximum reactive power.

7. The power adaptive compensation method for energy storage system in variable load scenario according to claim 6 is characterized in that: Set the minimum step size of reactive power compensation, including: Determining a proportional factor based on the deviation of the current power factor from a preset threshold value interval; The proportional factor is used to perform proportional calculation on the standard minimum step size to obtain the minimum step size of the reactive power compensation, wherein the standard minimum step size is set according to a preset ratio of the rated capacity of the equipment.

8. The power adaptive compensation method for energy storage system in variable load scenario according to claim 1 is characterized in that: The target reactive power compensation amount is determined based on the power factor, and the actual compensation value is set in combination with the maximum reactive power of the energy storage system, including: Determining a target reactive power compensation amount based on a deviation between the power factor and a preset threshold value interval; Calculate the maximum available reactive power output capacity based on the current power capacity and real-time active power output of the energy storage device; The target reactive power compensation amount and the maximum available reactive power output capacity are compared, and the smaller value between the two is set as the actual compensation value.

9. A power adaptive compensation system for an energy storage system for variable load scenarios, characterized in that it is used to implement the power adaptive compensation method for an energy storage system for variable load scenarios according to any one of claims 1 to 8, and the system comprises: Data acquisition unit: collects active power and reactive power information at the grid connection point of the energy storage system as current operating data; Calculation unit: calculates the power factor of the grid connection point based on the current operation data; Determining unit: determining whether the power factor is lower than a preset threshold range; Compensation determination unit: when the power factor is lower than the preset threshold range, activates the compensation module, determines the target reactive power compensation amount according to the power factor, and sets the actual compensation value in combination with the maximum reactive power of the energy storage system; Compensation unit: Generates compensation instructions based on the actual compensation value and sends them to the energy storage converter. The energy storage converter outputs the corresponding reactive power for compensation. When the energy storage is in the moment of discharge, instantaneous compensation is performed according to the actual compensation value. When the energy storage is in the non-instantaneous discharge process, slow rise and fall compensation is performed.

Images