Control method and control device of energy storage system, storage medium and program product

Abstract

The invention provides a control method and a control device of an energy storage system, a storage medium and a program product. The control method comprises the following steps: determining a voltage fluctuation value of a power supply device; and controlling the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the residual electric quantity of the flywheel energy storage device. Whether the energy storage system is under the impact load is judged by determining the voltage fluctuation value of the power supply device, the charging and discharging priorities of the flywheel energy storage device and the battery are determined according to the residual electric quantity of the flywheel energy storage device, and the flywheel energy storage device and / or the battery are / is controlled to discharge in combination with the impact load state of the energy storage system. According to the invention, charging is carried out by using the impact load or the excess load generated under the impact load, so that the voltage fluctuation under the impact load is inhibited, the impact load is solved, the electricity resources are saved, frequent charging and discharging of the battery are avoided, the service life of the battery is prolonged, the discharge energy loss is reduced, and the risks of explosion, fire and the like of the battery are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and in particular, to a control method for an energy storage system, a control device for an energy storage system, a computer-readable storage medium, and a computer program product. Background Art

[0002] Currently, intelligent computing centers account for 25% of the computing power, and this proportion will increase to 35% in 2025. With the development of artificial intelligence, the proportion of intelligent computing power will continue to increase. Intelligent computing power involves two processes in practical applications: training and inference, which are also the purposes of the power consumption of IT (Information Technology) devices in intelligent computing centers. Training is the process by which an AI (Artificial Intelligence) large model learns how to perform specific tasks. The model receives a large amount of data (referred to as the training data set), and the purpose of training is to enable the model to make accurate predictions or decisions on new and unseen data. Inference is the process of using the knowledge learned during training to process new data after the AI large model is trained. The model receives new input data and uses the trained logical judgments and parameters to generate predictions or decisions. The power consumption of inference is higher than that of training. Taking some AI systems as an example, the power consumption during their training process is about 1.287 million kWh; during the inference stage, the AI system responds to about 195 million demands per day, and each request consumes about 2.9 Wh, with a daily power consumption of about 560,000 kWh. The power consumed by the AI system during the training stage can only support the inference of the AI system for 2.5 days.

[0003] Therefore, the power load fluctuation of intelligent computing centers will increase, and the proportion of intelligent computing power will gradually increase and even become the main part. The power consumption of intelligent computing centers is mainly for inference power consumption, and the power load characteristics are mainly based on the load characteristics of inference. The training process must be carried out continuously and cannot be interrupted. The inference process needs to respond in real time, and the correlation between the load characteristics and the user's work and rest patterns increases, tending to be the same as the load pattern of the tertiary industry and domestic electricity, with an increasing fluctuation. In the future, the power load of intelligent computing centers in China will show stronger fluctuations, and currently, some intelligent computing centers already show the characteristics of a large peak-valley difference in power consumption, that is, there are impact loads, and it is difficult to adjust the load.

[0004] Therefore, the control method of the energy storage system is very important for solving the impact load. To solve the impact load, in related technologies, the load characteristics of AI fluctuate very frequently and violently. Due to the load fluctuation, the bus voltage fluctuates. To maintain the bus voltage, a battery is connected to the UPS (Uninterruptible Power Supply) device side, and the battery discharges following the voltage fluctuation to solve the problem of impact load.

[0005] However, when solving the impact load in the above - mentioned manner, the battery will charge and discharge frequently due to the fluctuation of the electrical load. And to ensure the reliability of power supply, the power supply is usually much greater than the required power consumption, resulting in waste of electrical resources, reduction of battery life, higher discharge energy loss, and risks such as explosion and fire. In addition, although the battery has a fast response speed, it is difficult to cope with ultra - high - frequency and short - time spikes (such as millisecond - level micro - fluctuations). Summary of the Invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0007] To this end, the first object of the present invention is to propose a control method for an energy storage system. While solving the impact load existing in the power supply, this method saves electrical resources, avoids frequent charging and discharging of the battery, improves the battery life, reduces the discharge energy loss, and reduces the risks such as explosion and fire of the battery.

[0008] To this end, the second object of the present invention is to propose a control device for an energy storage system.

[0009] To this end, the third object of the present invention is to propose a computer - readable storage medium.

[0010] To this end, the fourth object of the present invention is to propose a computer program product.

[0011] To achieve the above object, an embodiment of the first aspect of the present invention proposes a control method for an energy storage system. The energy storage system includes a flywheel energy storage device and a battery connected in parallel to a power supply device. The control method includes: determining the voltage fluctuation value of the power supply device; and controlling the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device.

[0012] According to the control method of the energy storage system in the embodiment of the present invention, by determining the voltage fluctuation value of the power supply device, it is judged whether the energy storage system is under an impact load. According to the remaining power of the flywheel energy storage device, the charge - discharge priority of the flywheel energy storage device and the battery is determined. Combining the impact - load state of the energy storage system, the flywheel energy storage device and / or the battery are controlled to discharge to the load, or the excess load generated under the impact load is used to charge the flywheel energy storage device and / or the battery, so as to suppress the voltage fluctuation under the impact load. While solving the impact load, electrical resources are saved, frequent charging and discharging of the battery are avoided, the battery life is improved, the discharge energy loss is reduced, and the risks such as explosion and fire of the battery are reduced.

[0013] In some embodiments, controlling the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device includes: determining the working mode of the flywheel energy storage device and / or the battery according to the voltage fluctuation value, a preset upper limit value of voltage fluctuation, and a preset lower limit value of voltage fluctuation, where the preset upper limit value of voltage fluctuation is greater than or equal to the preset lower limit value of voltage fluctuation; and controlling the flywheel energy storage device and / or the battery to discharge or charge according to the remaining power of the flywheel energy storage device in the working mode.

[0014] In some embodiments, controlling the flywheel energy storage device and / or the battery to discharge or charge according to the remaining power of the flywheel energy storage device in the working mode includes: when the working mode is a discharge mode, controlling the flywheel energy storage device and / or the battery to discharge according to the remaining power of the flywheel energy storage device and a preset discharge threshold; when the working mode is a charging mode, controlling the flywheel energy storage device and / or the battery to charge according to the remaining power of the flywheel energy storage device and a preset charging threshold, where the preset charging threshold is greater than or equal to the preset discharge threshold; and when the working mode is an idle mode, controlling the flywheel energy storage device and the battery to remain in a floating charge state or controlling the flywheel energy storage device to charge according to the remaining power of the flywheel energy storage device and a preset floating charge threshold.

[0015] In some embodiments, determining the working mode of the flywheel energy storage device and / or the battery according to the voltage fluctuation value, a preset upper limit value of voltage fluctuation, and a preset lower limit value of voltage fluctuation includes: when the voltage fluctuation value is greater than or equal to the preset lower limit value of voltage fluctuation and less than or equal to the preset upper limit value of voltage fluctuation, determining that the working mode of the flywheel energy storage device and / or the battery is an idle mode; when the voltage fluctuation value is less than the preset lower limit value of voltage fluctuation, determining that the working mode of the flywheel energy storage device and / or the battery is a discharge mode; and when the voltage fluctuation value is greater than the preset upper limit value of voltage fluctuation, determining that the working mode of the flywheel energy storage device and / or the battery is a charging mode.

[0016] In some embodiments, determining the voltage fluctuation value of the power supply device includes: obtaining the actual voltage of the power supply device; and determining the voltage fluctuation value of the power supply device according to the difference between the actual voltage and a preset average voltage.

[0017] In some embodiments, controlling the flywheel energy storage device and / or the battery to discharge according to the remaining power of the flywheel energy storage device and a preset discharge threshold includes: when the remaining power of the flywheel energy storage device is greater than or equal to the preset discharge threshold and less than or equal to a first preset value, controlling the flywheel energy storage device to discharge, where the preset discharge threshold is less than or equal to the first preset value; when the remaining power of the flywheel energy storage device is greater than or equal to a second preset value and less than the preset discharge threshold, controlling the battery to discharge, where the preset discharge threshold is greater than the second preset value, and the first preset value is greater than the second preset value.

[0018] In some embodiments, controlling the flywheel energy storage device and / or the battery to charge according to the remaining power of the flywheel energy storage device and a preset charge threshold includes: when the remaining power of the flywheel energy storage device is greater than or equal to the preset charge threshold and less than or equal to a first preset value, controlling the battery to charge, where the preset charge threshold is less than the first preset value; when the remaining power of the flywheel energy storage device is greater than or equal to a second preset value and less than the preset charge threshold, controlling the flywheel energy storage device to charge, where the preset charge threshold is greater than or equal to the second preset value.

[0019] To achieve the above object, an embodiment of the second aspect of the present invention provides a control device for an energy storage system. The energy storage system includes a flywheel energy storage device and a battery connected in parallel to a power supply device. The control device includes: a determination module that determines a voltage fluctuation value of the power supply device; and a control module that controls the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device.

[0020] According to the control device for an energy storage system of an embodiment of the present invention, when controlling the energy storage system, by determining the voltage fluctuation value of the power supply device, it is determined whether the energy storage system is under an impact load. According to the remaining power of the flywheel energy storage device, the charge and discharge priorities of the flywheel energy storage device and the battery are determined. Combining the impact load state of the energy storage system, the flywheel energy storage device and / or the battery are controlled to discharge to a load, or the excess load generated under the impact load is used to charge the flywheel energy storage device and / or the battery, so as to suppress the voltage fluctuation under the impact load, save electric resources while solving the impact load, avoid frequent charge and discharge of the battery, improve the battery life, reduce the discharge energy loss, and reduce the risks such as explosion and fire of the battery.

[0021] To achieve the above object, an embodiment of the third aspect of the present invention provides a computer-readable storage medium, on which a control program of an energy storage system is stored. When the control program of the energy storage system is executed by a processor, a device installed with the control program of the energy storage system realizes the control method of the energy storage system as described in the above embodiments.

[0022] To achieve the above object, an embodiment of the fourth aspect of the present invention provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it realizes the control method of the energy storage system as described in the above embodiments.

[0023] According to the computer program product of the embodiments of the present invention, by determining the voltage fluctuation value of the power supply device, it is judged whether the energy storage system is under an impact load. According to the remaining power of the flywheel energy storage device, the charge and discharge priorities of the flywheel energy storage device and the battery are determined. Combining the impact load state of the energy storage system, the flywheel energy storage device and / or the battery are controlled to discharge the load, or the excess load generated under the impact load is used to charge the flywheel energy storage device and / or the battery, so as to suppress the voltage fluctuation under the impact load, save electric resources while solving the impact load, avoid frequent charge and discharge of the battery, improve the battery life, reduce the discharge energy loss, and reduce the risks such as explosion and fire of the battery.

[0024] The additional aspects and advantages of the present invention will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present invention. Description of the Drawings

[0025] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where: Figure 1 is a flowchart of a control method of an energy storage system according to an embodiment of the present invention; Figure 2 is a block diagram of an energy storage system according to an embodiment of the present invention; Figure 3 is a flowchart of a control method of an energy storage system according to another embodiment of the present invention; Figure 4 is a block diagram of a control device of an energy storage system according to an embodiment of the present invention.

[0026] Reference Signs: Power supply device 80; Battery 82; Flywheel energy storage device 83; Load 81; Energy storage system 84; Determination module 100; Control module 101; Control device 102 of the energy storage system. Specific Embodiments

[0027] The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention will be described in detail below.

[0028] The following will be combined with Figures 1-3 to describe the control method of the energy storage system according to the embodiments of the present invention.

[0029] As Figure 1 shown, it is a flowchart of the control method of the energy storage system according to an embodiment of the present invention. The energy storage system according to the embodiment of the present invention includes a flywheel energy storage device and a battery connected in parallel to a power supply device. The control method of the energy storage system at least includes step S1 and step S2.

[0030] Step S1, determine the voltage fluctuation value of the power supply device.

[0031] In the embodiment, as Figure 2 shown, it is a block diagram of the energy storage system according to an embodiment of the present invention. The power supply device 80, for example, a UPS device, is a power protection system containing an energy storage device and can provide continuous and stable power supply. Determine the voltage fluctuation value of the power supply device. For example, by obtaining the actual voltage of the power supply device 80 and the average voltage of the power supply device 80, to determine the voltage fluctuation value of the power supply device, and prepare for determining whether there is an impact load in the energy storage system 84.

[0032] Step S2, control the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device.

[0033] In the embodiment, the flywheel energy storage device has instantaneous response (millisecond level), can release or absorb high power in an extremely short time (millisecond level) to cope with instantaneous impacts such as the startup of IT equipment in the intelligent computing center and load mutations; at the same time, the flywheel charge and discharge cycle life can reach millions of times, is suitable for frequent short-term (second level) power fluctuation scenarios, reduces the charge and discharge times of the battery, and has high mechanical energy storage efficiency (up to more than 90%) and no chemical conversion loss; the battery has a high energy density, can supply power continuously for several hours at a time, and has a stable output voltage and small voltage fluctuation, and is suitable for long-term power supply.

[0034] The flywheel energy storage device 83 and the battery 82 are connected in parallel to the power supply device 80. For example, the flywheel energy storage device and the battery are connected in parallel to the DC bus of the UPS device. Determine whether the energy storage system is under a load impact according to the voltage fluctuation value. If it is under a load impact, determine whether the load impact is a state of sudden load increase or sudden load decrease. In the state of sudden load increase, the instantaneous power demand of the load surges, and the commercial power cannot immediately meet the surging demand, resulting in a short-term power gap and a sudden voltage drop. Therefore, it is necessary to control the flywheel energy storage device and / or the battery to discharge to meet the increased power demand of the load, achieve the effect of suppressing voltage fluctuations and solving the impact load. Specifically, determine whether the remaining power of the flywheel energy storage device reaches the condition for discharging. If the remaining power of the flywheel energy storage device reaches the condition for discharging, the flywheel energy storage device discharges to the load, suppresses voltage fluctuations, solves the impact load, and at the same time ensures the power demand of the load. Moreover, the flywheel energy storage device undertakes the instantaneous peak load and most of the power output, avoiding frequent deep discharge of the battery (such as discharging from 100% to 20%), minimizing the charge and discharge times of the battery, extending the service life of the battery, and reducing the risks such as battery fire and explosion. If the remaining power of the flywheel energy storage device does not reach the condition for discharging, that is, the flywheel energy storage device is in a prohibited discharge state, the battery discharges to the load to suppress voltage fluctuations, solve the impact load, and at the same time ensure the power supply demand of the load. Moreover, the battery provides energy support from minutes to hours to make up for the medium- and long-term load fluctuations that the flywheel energy storage device cannot meet (such as during the delay of standby power supply switching), extending the battery life and reducing the overall system loss.

[0035] In the state of sudden load decrease, there will be a sudden voltage rise. Therefore, it is necessary to control the flywheel energy storage device and / or the battery to charge to achieve the effects of suppressing voltage fluctuations, solving the impact load, and saving power resources. Specifically, determine whether the remaining power of the flywheel energy storage device reaches the condition for charging. If the remaining power of the flywheel energy storage device reaches the condition for charging, the flywheel energy storage device preferentially uses the excess load generated in the state of sudden load decrease for charging to suppress voltage fluctuations, solve the impact load, and at the same time utilize the excess load generated in the state of sudden load decrease to improve the utilization rate of power resources. If the remaining power of the flywheel energy storage device does not reach the condition for charging, that is, the flywheel energy storage device is in a prohibited charging state, the battery uses the excess load generated in the state of sudden load decrease for charging to suppress voltage fluctuations (for example, suppressing 0.4kV / 10kV megawatt-level fluctuating loads), solve the impact load, and at the same time utilize the excess load generated in the state of sudden load decrease to improve the utilization rate of power resources.

[0036] It can be understood that in the above process of solving the impact load, the flywheel energy storage device is responsible for handling frequent load impacts, and the battery is responsible for long-term power backup. In addition, the dual backup of the flywheel energy storage device and the battery enables one of them to still provide emergency support when the other fails, improving the reliability and stability of the energy storage system. Moreover, the flywheel energy storage device and the battery give full play to the characteristics of the battery having a relatively long discharge time and a large capacity for energy storage, as well as the advantages of the flywheel energy storage device that its energy storage can quickly respond to charge and discharge, perform high-power charge and discharge, and has a long service life.

[0037] According to the control method of the energy storage system according to an embodiment of the present invention, by determining the voltage fluctuation value of the power supply device, it is judged whether the energy storage system is under an impact load. According to the remaining power of the flywheel energy storage device, the charge and discharge priorities of the flywheel energy storage device and the battery are determined. Combining the impact load state in which the energy storage system is located, the flywheel energy storage device and / or the battery are controlled to discharge to the load, or the excess load generated under the impact load is used to charge the flywheel energy storage device and / or the battery, so as to suppress the voltage fluctuation under the impact load, save electric resources while solving the impact load, avoid frequent charge and discharge of the battery, improve the battery life, reduce the discharge energy loss, and reduce the risks such as explosion and fire of the battery.

[0038] In some embodiments, controlling the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device includes: determining the working mode of the flywheel energy storage device and / or the battery according to the voltage fluctuation value, the preset voltage fluctuation upper limit value, and the preset voltage fluctuation lower limit value, where the preset voltage fluctuation upper limit value is greater than or equal to the preset voltage fluctuation lower limit value; in the working mode, controlling the flywheel energy storage device and / or the battery to discharge or charge according to the remaining power of the flywheel energy storage device.

[0039] In the embodiment, as Figure 2 shown, the preset voltage fluctuation upper limit value is the critical value for judging that the power supply device 80 has a load impact within a certain error range. Exceeding this critical value, it is considered that the power supply device 80 has a load impact, and at this time, the load impact state is a load sudden decrease state. In the load sudden decrease state, a voltage sudden increase will occur. Let the preset voltage fluctuation upper limit value be ; the preset voltage fluctuation lower limit value is the critical value for judging that the power supply device 80 has a load impact within a certain error range. Less than this critical value, it is considered that the power supply device 80 has a load impact, and at this time, the load impact state is a load sudden increase state. In the load sudden increase state, the instantaneous power demand of the load 81 (for example, the intelligent computing center) surges, and the commercial power cannot immediately meet the surging demand, resulting in a short-term power gap and a voltage sudden drop. Let the preset voltage fluctuation lower limit value be ; the above preset voltage fluctuation upper limit value is greater than or equal to the preset voltage fluctuation lower limit value, that is ≥ ; according to the voltage fluctuation value , the preset upper limit value of voltage fluctuation and the preset lower limit value of voltage fluctuation judge the state of the load impact, so as to determine the working mode of the flywheel energy storage device and / or the battery; in the corresponding working mode, according to the remaining power of the flywheel energy storage device, determine whether the flywheel energy storage device and / or the battery discharges to supply power to the load, or whether the flywheel energy storage device and / or the battery needs to be charged, so as to determine the charge and discharge state of the flywheel energy storage device and / or the battery in different working modes.

[0040] In some embodiments, in the working mode, controlling the flywheel energy storage device and / or the battery to discharge or charge according to the remaining power of the flywheel energy storage device includes: when the working mode is the discharge mode, controlling the flywheel energy storage device and / or the battery to discharge according to the remaining power of the flywheel energy storage device and the preset discharge threshold; when the working mode is the charging mode, controlling the flywheel energy storage device and / or the battery to charge according to the remaining power of the flywheel energy storage device and the preset charging threshold, wherein the preset charging threshold is greater than or equal to the preset discharge threshold; when the working mode is the idle mode, controlling the flywheel energy storage device and the battery to remain in the floating charge state or controlling the flywheel energy storage device to charge according to the remaining power of the flywheel energy storage device and the preset floating charge threshold.

[0041] In an embodiment, the discharge mode is a mode in which a load impact occurs and the load impact is in a state of sudden load increase, and the flywheel energy storage device and / or the battery discharges to the load; the charging mode is a mode in which a load impact occurs and the load impact is in a state of sudden load decrease, and the flywheel energy storage device and / or the battery is charged; the idle mode is a mode in which no load impact occurs and there is no need for the flywheel energy storage device and / or the battery to perform work related to solving the load impact; the remaining power of the flywheel energy storage device is the actual available electric energy reserve of the flywheel energy storage device in the current state, which is assumed to be expressed as a percentage, simply referred to as SOC (State of Charge); the preset discharge threshold is a critical value for judging whether the remaining power of the flywheel energy storage device reaches the condition for discharging, which is set as a; the preset charging threshold is a critical value for judging whether the remaining power of the flywheel energy storage device reaches the condition for charging, which is set as b; the preset floating charge threshold is a critical value for judging that the remaining power of the flywheel energy storage device and the battery has reached the floating charge state. The preset floating charge threshold of the flywheel energy storage device is set as c, and the preset floating charge threshold of the battery is set as d; the above preset charging threshold is greater than or equal to the preset discharge threshold.

[0042] When the working mode is the discharging mode, according to the remaining power SOC of the flywheel energy storage device and the preset discharging threshold a, control the flywheel energy storage device and / or the battery to discharge, so as to solve the load impact and ensure that the power supply demand of the load is met; when the working mode is the charging mode, according to the remaining power SOC of the flywheel energy storage device and the preset charging threshold b, control the flywheel energy storage device and / or the battery to charge, so as to solve the load impact and improve the utilization rate of electric resources; when the working mode is the idle mode, according to the remaining power SOC of the flywheel energy storage device and the preset floating charge threshold, control the flywheel energy storage device to remain in the floating charge state or control the flywheel energy storage device to charge. Specifically, if the remaining power SOC of the flywheel energy storage device reaches the preset floating charge threshold, that is, when SOC≥c, it is considered that the flywheel energy storage device is already in the floating charge state, then continue to control the flywheel energy storage device to remain in the floating charge state, so as to ensure that when a load impact occurs, the remaining power of the flywheel energy storage device can discharge for the load. If the remaining power SOC of the flywheel energy storage device does not reach the preset floating charge threshold, that is, when SOC<c, and at this time the energy storage system is not under load impact and there is no excess load, the flywheel energy storage device can be charged through the mains power, so as to ensure that when a load impact occurs, the remaining power of the flywheel energy storage device can discharge for the load. If the remaining power of the battery reaches the preset floating charge threshold d of the battery, then the battery is also kept in the floating charge state. If the power of the battery does not reach the preset floating charge threshold d, it can be selected to charge the battery according to the demand or not to charge after the flywheel energy storage device reaches the floating charge state, so as to ensure that when the energy storage system is under load impact and there is excess load generated, at least the battery can absorb the generated excess load, suppress voltage fluctuations, solve the impact load, avoid waste of excess load, and at the same time ensure that when the power consumption demand of the load surges, the flywheel energy storage device supplies power preferentially, suppress voltage fluctuations, and solve the impact load.

[0043] In some embodiments, according to the voltage fluctuation value, the preset upper limit value of voltage fluctuation and the preset lower limit value of voltage fluctuation, determine the working mode of the flywheel energy storage device and / or the battery, including: when the voltage fluctuation value is greater than or equal to the preset lower limit value of voltage fluctuation and less than or equal to the preset upper limit value of voltage fluctuation, determine the working mode of the flywheel energy storage device and / or the battery as the idle mode; when the voltage fluctuation value is less than the preset lower limit value of voltage fluctuation, determine the working mode of the flywheel energy storage device and / or the battery as the discharging mode; when the voltage fluctuation value is greater than the preset upper limit value of voltage fluctuation, determine the working mode of the flywheel energy storage device and / or the battery as the charging mode.

[0044] In the embodiment, as Figure 2 shown, the voltage fluctuation value is greater than or equal to the preset lower limit value of voltage fluctuation and less than or equal to the preset upper limit value of voltage fluctuation, that is ≤ ≤ When it is considered that within a certain allowable error range, the voltage of the power supply device 80 is within the normal and stable range and there is no load impact, then there is no need for the flywheel energy storage device and / or the battery to perform work related to solving the load impact. Therefore, the working mode of the flywheel energy storage device and / or the battery is the idle mode; the voltage fluctuation value is less than the preset lower limit of voltage fluctuation, that is < When it is, it indicates that a load impact has occurred, and at this time, the load impact state is a state of sudden load increase. In the state of sudden load increase, the instantaneous power demand of the load 81 (for example, the intelligent computing center) surges, and the mains power cannot immediately meet the surging demand, resulting in a short-term power gap and causing the voltage to drop suddenly. Therefore, it is determined that the working mode of the flywheel energy storage device and / or the battery is the discharge mode to solve the load impact and ensure the power supply of the load; the voltage fluctuation value is greater than the preset upper limit value of voltage fluctuation, that is > When it is, it indicates that a load impact has occurred, and at this time, the load impact state is a state of sudden load decrease. In the state of sudden load decrease, the voltage will rise suddenly, and there may be an excess load. For example, when the voltage fluctuation is large and at the peak value, then it is determined that the working mode of the flywheel energy storage device and / or the battery is the charging mode to solve the load impact, reduce the power resource loss, and improve the power resource utilization rate.

[0045] In some embodiments, determining the voltage fluctuation value of the power supply device includes: obtaining the actual voltage of the power supply device; determining the voltage fluctuation value of the power supply device according to the difference between the actual voltage and the preset average voltage.

[0046] In the embodiment, as Figure 2 shown, the preset average voltage is the average voltage of the power supply device 80 without impact load in the past period of time according to the demand and the experimental calibration result; obtaining the actual voltage of the power supply device 80, for example, taking the voltage on the DC bus, denoted as U, to prepare data for determining the voltage fluctuation value of the power supply device 80, denoted as U AV ; according to the difference between the actual voltage U and the preset average voltage U AV , determining the voltage fluctuation value ∆U of the power supply device 80 as ∆U = U - U AV , to prepare for determining whether there is an impact load in the energy storage system.

[0047] In some embodiments, according to the remaining power of the flywheel energy storage device and a preset discharge threshold, controlling the flywheel energy storage device and / or the battery to discharge includes: when the remaining power of the flywheel energy storage device is greater than or equal to the preset discharge threshold and less than or equal to a first preset value, controlling the flywheel energy storage device to discharge, where the preset discharge threshold is less than or equal to the first preset value; when the remaining power of the flywheel energy storage device is greater than or equal to a second preset value and less than the preset discharge threshold, controlling the battery to discharge, where the preset discharge threshold is greater than the second preset value, and the first preset value is greater than the second preset value.

[0048] In an embodiment, the first preset value is the energy storage upper limit of the flywheel energy storage device and the battery, for example, 100%; the second preset value is the energy storage lower limit of the flywheel energy storage device and the battery, for example, 0%; when the working mode is the discharge mode, when the remaining power SOC of the flywheel energy storage device is greater than or equal to the preset discharge threshold a and less than or equal to the first preset value 100%, that is, a ≤ SOC ≤ 100%, it indicates that the remaining power of the flywheel energy storage device reaches the condition for discharging and can undertake the discharge task. Then, control the flywheel energy storage device to discharge the load to use the flywheel energy storage device to undertake the instantaneous peak load, avoid frequent deep discharge of the battery (such as discharging from 100% to 20%), solve the load impact, and ensure the power supply of the load; when the remaining power SOC of the flywheel energy storage device is greater than or equal to the second preset value 0% and less than the preset discharge threshold a, that is, 0% ≤ SOC ≤ a, it indicates that the remaining power of the flywheel energy storage device does not reach the condition for discharging, and the battery needs to undertake the discharge task. Then, control the battery to discharge to use the battery to provide energy support from minutes to hours, make up for the medium and long-term load fluctuations that the flywheel energy storage device cannot meet (such as during the standby power supply switching delay period), extend the battery life, and reduce the overall system loss. It can be understood that, according to requirements and experimental calibration, etc., the flywheel energy storage device and the battery can also undertake the discharge task together in a certain proportion, etc. When the remaining power SOC of the flywheel energy storage device satisfies a ≤ SOC ≤ b, it can also undertake the discharge task according to requirements.

[0049] In some embodiments, according to the remaining power of the flywheel energy storage device and a preset charging threshold, controlling the flywheel energy storage device and / or the battery to charge includes: when the remaining power of the flywheel energy storage device is greater than or equal to the preset charging threshold and less than or equal to a first preset value, controlling the battery to charge, where the preset charging threshold is less than the first preset value; when the remaining power of the flywheel energy storage device is greater than or equal to a second preset value and less than the preset charging threshold, controlling the flywheel energy storage device to charge, where the preset charging threshold is greater than or equal to the second preset value.

[0050] In an embodiment, when the working mode is the charging mode, the state of charge (SOC) of the flywheel energy storage device is greater than or equal to a preset charging threshold b and less than or equal to a first preset value of 100%, that is, when b ≤ SOC ≤ 100%, it indicates that the remaining power of the flywheel energy storage device does not reach the condition for charging. Then, charge the battery. At this time, the charging preferentially uses the excess load generated under load impact in the energy storage system to charge the battery, so as to suppress voltage fluctuations, solve impact loads, and improve the utilization rate of electric resources. When the state of charge (SOC) of the flywheel energy storage device is greater than or equal to a second preset value of 0% and less than the preset charging threshold b, that is, when 0% ≤ SOC ≤ b, it indicates that the remaining power of the flywheel energy storage device reaches the condition for charging. Compared with the battery, since it is necessary to preferentially ensure that the flywheel energy storage device has a remaining power that can be charged, the flywheel energy storage device is charged. At this time, the charging preferentially uses the excess load generated under load impact in the energy storage system to charge the flywheel energy storage device, so as to suppress voltage fluctuations, solve impact loads, and improve the utilization rate of electric resources. Wherein, the preset charging threshold is less than the first preset value, that is, b < 100%, and the preset charging threshold is greater than or equal to the second preset value, that is, b ≥ 0%.

[0051] The following refers to Figure 3 for a specific description of the control method of the energy storage system according to the embodiment of the present invention.

[0052] As Figure 3 shown, it is a flowchart of the control method of the energy storage system according to another embodiment of the present invention. The control method of the energy storage system according to the embodiment of the present invention at least includes steps S10 - step S22.

[0053] Step S10, start.

[0054] Step S11, obtain the actual voltage of the power supply device.

[0055] Step S12, determine the voltage fluctuation value of the power supply device according to the difference between the actual voltage and the preset average voltage.

[0056] Step S13, when the voltage fluctuation value is greater than or equal to the preset voltage fluctuation lower limit value and less than or equal to the preset voltage fluctuation upper limit value, determine that the working mode of the flywheel energy storage device and / or the battery is the idle mode.

[0057] Step S14, when the working mode is the idle mode, control the flywheel energy storage device and the battery to maintain the floating charge state or control the flywheel energy storage device to charge according to the remaining power of the flywheel energy storage device and the preset floating charge threshold.

[0058] Step S15, when the voltage fluctuation value is less than the preset voltage fluctuation lower limit, determine that the working mode of the flywheel energy storage device and / or the battery is the discharge mode.

[0059] Step S16: When the working mode is the discharging mode, control the flywheel energy storage device and / or the battery to discharge according to the remaining power of the flywheel energy storage device and the preset discharging threshold.

[0060] Step S17: When the remaining power of the flywheel energy storage device is greater than or equal to the preset discharging threshold and less than or equal to the first preset value, control the flywheel energy storage device to discharge.

[0061] Step S18: When the remaining power of the flywheel energy storage device is greater than or equal to the second preset value and less than the preset discharging threshold, control the battery to discharge.

[0062] Step S19: When the voltage fluctuation value is greater than the preset upper limit of voltage fluctuation, determine that the working mode of the flywheel energy storage device and / or the battery is the charging mode.

[0063] Step S20: When the working mode is the charging mode, control the flywheel energy storage device and / or the battery to charge according to the remaining power of the flywheel energy storage device and the preset charging threshold.

[0064] Step S21: When the remaining power of the flywheel energy storage device is greater than or equal to the preset charging threshold and less than or equal to the first preset value, control the battery to charge.

[0065] Step S22: When the remaining power of the flywheel energy storage device is greater than or equal to the second preset value and less than the preset charging threshold, control the flywheel energy storage device to charge.

[0066] According to the control method of the energy storage system of the embodiment of the present invention, by determining the voltage fluctuation value of the power supply device, it is judged whether the energy storage system is under an impact load. According to the remaining power of the flywheel energy storage device, the charge and discharge priorities of the flywheel energy storage device and the battery are determined. Combining the impact load state of the energy storage system, control the flywheel energy storage device and / or the battery to discharge the load, or use the excess load generated under the impact load to charge the flywheel energy storage device and / or the battery, so as to suppress the voltage fluctuation under the impact load, save power resources while solving the impact load, avoid the frequent charge and discharge of the battery, improve the battery life, reduce the discharge energy loss, and reduce the risks such as the explosion and fire of the battery.

[0067] Next, refer to Figure 4 Describe the control device of the energy storage system of the embodiment of the present invention.

[0068] As Figure 4As shown, it is a block diagram of a control device for an energy storage system according to an embodiment of the present invention. The energy storage system includes a flywheel energy storage device and a battery connected in parallel to a power supply device. The control device 102 of the energy storage system according to an embodiment of the present invention includes: a determination module 100 that determines the voltage fluctuation value of the power supply device; and a control module 101 that controls the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device.

[0069] For the control device 102 of the energy storage system according to an embodiment of the present invention, when the control device controls the energy storage system, by determining the voltage fluctuation value of the power supply device, it determines whether the energy storage system is under an impact load. According to the remaining power of the flywheel energy storage device, it determines the charge and discharge priorities of the flywheel energy storage device and the battery. Combining the impact load state of the energy storage system, it controls the flywheel energy storage device and / or the battery to discharge to the load, or uses the excess load generated under the impact load to charge the flywheel energy storage device and / or the battery, so as to suppress the voltage fluctuation under the impact load, save power resources while solving the impact load, avoid frequent charge and discharge of the battery, improve the battery life, reduce the discharge energy loss, and reduce the risks such as explosion and fire of the battery.

[0070] Next, refer to Figure 4 to describe the control device of the energy storage system according to an embodiment of the present invention.

[0071] In some embodiments, the control module 101 is configured to: control the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device, including: determining the working mode of the flywheel energy storage device and / or the battery according to the voltage fluctuation value, a preset voltage fluctuation upper limit value, and a preset voltage fluctuation lower limit value, where the preset voltage fluctuation upper limit value is greater than or equal to the preset voltage fluctuation lower limit value; and controlling the flywheel energy storage device and / or the battery to discharge or charge according to the remaining power of the flywheel energy storage device in the working mode.

[0072] In some embodiments, the control module 101 is configured to: control the flywheel energy storage device and / or the battery to discharge or charge according to the remaining power of the flywheel energy storage device in the working mode, including: when the working mode is the discharge mode, controlling the flywheel energy storage device and / or the battery to discharge according to the remaining power of the flywheel energy storage device and a preset discharge threshold; when the working mode is the charge mode, controlling the flywheel energy storage device and / or the battery to charge according to the remaining power of the flywheel energy storage device and a preset charge threshold, where the preset charge threshold is greater than or equal to the preset discharge threshold; when the working mode is the idle mode, controlling the flywheel energy storage device and the battery to maintain the floating charge state or controlling the flywheel energy storage device to charge according to the remaining power of the flywheel energy storage device and a preset floating charge threshold.

[0073] In some embodiments, the control module 101 is configured to: determine the operating modes of the flywheel energy storage device and / or the battery according to the voltage fluctuation value, the preset upper limit value of voltage fluctuation, and the preset lower limit value of voltage fluctuation, including: when the voltage fluctuation value is greater than or equal to the preset lower limit value of voltage fluctuation and less than or equal to the preset upper limit value of voltage fluctuation, determining that the operating mode of the flywheel energy storage device and / or the battery is the idle mode; when the voltage fluctuation value is less than the preset lower limit value of voltage fluctuation, determining that the operating mode of the flywheel energy storage device and / or the battery is the discharging mode; when the voltage fluctuation value is greater than the preset upper limit value of voltage fluctuation, determining that the operating mode of the flywheel energy storage device and / or the battery is the charging mode.

[0074] In some embodiments, the determination module 100 is configured to: determine the voltage fluctuation value of the power supply device, including: obtaining the actual voltage of the power supply device; and determining the voltage fluctuation value of the power supply device according to the difference between the actual voltage and the preset average voltage.

[0075] In some embodiments, the control module 101 is configured to: control the flywheel energy storage device and / or the battery to discharge according to the remaining power of the flywheel energy storage device and the preset discharge threshold, including: when the remaining power of the flywheel energy storage device is greater than or equal to the preset discharge threshold and less than or equal to the first preset value, controlling the flywheel energy storage device to discharge, where the preset discharge threshold is less than or equal to the first preset value; when the remaining power of the flywheel energy storage device is greater than or equal to the second preset value and less than the preset discharge threshold, controlling the battery to discharge, where the preset discharge threshold is greater than the second preset value, and the first preset value is greater than the second preset value.

[0076] In some embodiments, controlling the flywheel energy storage device and / or the battery to charge according to the remaining power of the flywheel energy storage device and the preset charge threshold, including: when the remaining power of the flywheel energy storage device is greater than or equal to the preset charge threshold and less than or equal to the first preset value, controlling the battery to charge, where the preset charge threshold is less than the first preset value; when the remaining power of the flywheel energy storage device is greater than or equal to the second preset value and less than the preset charge threshold, controlling the flywheel energy storage device to charge, where the preset charge threshold is greater than or equal to the second preset value.

[0077] The control device 102 of the energy storage system according to an embodiment of the present invention, when controlling the energy storage system, determines the voltage fluctuation value of the power supply device to judge whether the energy storage system is under an impact load, determines the charge-discharge priority of the flywheel energy storage device and the battery according to the remaining power of the flywheel energy storage device, combines the impact load state of the energy storage system, and controls the flywheel energy storage device and / or the battery to discharge the load, or uses the excess load generated under the impact load to charge the flywheel energy storage device and / or the battery, so as to suppress the voltage fluctuation under the impact load, save electric resources while solving the impact load, avoid frequent charge and discharge of the battery, improve the battery life, reduce the discharge energy loss, and reduce the risks such as explosion and fire of the battery.

[0078] The computer-readable storage medium of the embodiment of the present invention will be described below.

[0079] The computer-readable storage medium of the embodiment of the present invention stores a control program for the energy storage system. When the control program for the energy storage system is executed by a processor, the device installed with the control program for the energy storage system realizes the control method of the energy storage system as described in the above embodiment. The computer program product of the embodiment of the present invention will be described below.

[0080] The computer program product of the embodiment of the present invention will be described below.

[0081] The computer program product of the embodiment of the present invention includes a computer program. When the computer program is executed by a processor, it realizes the control method of the energy storage system as described in the above embodiment.

[0082] The computer program product according to an embodiment of the present invention determines the voltage fluctuation value of the power supply device to judge whether the energy storage system is under an impact load, determines the charge-discharge priority of the flywheel energy storage device and the battery according to the remaining power of the flywheel energy storage device, combines the impact load state of the energy storage system, and controls the flywheel energy storage device and / or the battery to discharge the load, or uses the excess load generated under the impact load to charge the flywheel energy storage device and / or the battery, so as to suppress the voltage fluctuation under the impact load, save electric resources while solving the impact load, avoid frequent charge and discharge of the battery, improve the battery life, reduce the discharge energy loss, and reduce the risks such as explosion and fire of the battery.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example.

[0084] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control method for an energy storage system, characterized in that, The energy storage system includes a flywheel energy storage device and a battery connected in parallel to a power supply device, and the control method includes: Determining a voltage fluctuation value of the power supply device; Controlling the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device.

2. The control method of the energy storage system according to claim 1, wherein The controlling the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device includes: Determining an operating mode of the flywheel energy storage device and / or the battery according to the voltage fluctuation value, a preset upper voltage fluctuation limit value, and a preset lower voltage fluctuation limit value, where the preset upper voltage fluctuation limit value is greater than or equal to the preset lower voltage fluctuation limit value; Controlling the flywheel energy storage device and / or the battery to discharge or charge according to the remaining power of the flywheel energy storage device in the operating mode.

3. The control method of the energy storage system according to claim 2, wherein, The controlling the flywheel energy storage device and / or the battery to discharge or charge according to the remaining power of the flywheel energy storage device in the operating mode includes: When the operating mode is a discharge mode, controlling the flywheel energy storage device and / or the battery to discharge according to the remaining power of the flywheel energy storage device and a preset discharge threshold; When the operating mode is a charging mode, controlling the flywheel energy storage device and / or the battery to charge according to the remaining power of the flywheel energy storage device and a preset charging threshold, where the preset charging threshold is greater than or equal to the preset discharge threshold; When the operating mode is an idle mode, controlling the flywheel energy storage device and the battery to remain in a floating charge state or controlling the flywheel energy storage device to charge according to the remaining power of the flywheel energy storage device and a preset floating charge threshold.

4. The control method of the energy storage system according to claim 2, wherein The determining the operating mode of the flywheel energy storage device and / or the battery according to the voltage fluctuation value, the preset upper voltage fluctuation limit value, and the preset lower voltage fluctuation limit value includes: When the voltage fluctuation value is greater than or equal to the preset lower voltage fluctuation limit value and less than or equal to the preset upper voltage fluctuation limit value, determining the operating mode of the flywheel energy storage device and / or the battery as an idle mode; When the voltage fluctuation value is less than the preset lower voltage fluctuation limit value, determining the operating mode of the flywheel energy storage device and / or the battery as a discharge mode; When the voltage fluctuation value is greater than the preset upper voltage fluctuation limit value, determining the operating mode of the flywheel energy storage device and / or the battery as a charging mode.

5. The control method of the energy storage system according to claim 1, wherein, The determining the voltage fluctuation value of the power supply device includes: Obtaining the actual voltage of the power supply device; Determining the voltage fluctuation value of the power supply device according to the difference between the actual voltage and a preset average voltage.

6. The control method of the energy storage system according to claim 3, characterized in that, The controlling the flywheel energy storage device and / or the battery to discharge according to the remaining power of the flywheel energy storage device and the preset discharge threshold includes: When the remaining power of the flywheel energy storage device is greater than or equal to the preset discharge threshold and less than or equal to a first preset value, controlling the flywheel energy storage device to discharge, where the preset discharge threshold is less than or equal to the first preset value; When the remaining power of the flywheel energy storage device is greater than or equal to a second preset value and less than a preset discharge threshold, control the battery to discharge, where the preset discharge threshold is greater than the second preset value, and the first preset value is greater than the second preset value.

7. The control method of the energy storage system according to claim 3, characterized in that Controlling the flywheel energy storage device and / or the battery to charge according to the remaining power of the flywheel energy storage device and a preset charge threshold includes: When the remaining power of the flywheel energy storage device is greater than or equal to the preset charge threshold and less than or equal to the first preset value, control the battery to charge, where the preset charge threshold is less than the first preset value; When the remaining power of the flywheel energy storage device is greater than or equal to the second preset value and less than the preset charge threshold, control the flywheel energy storage device to charge, where the preset charge threshold is greater than or equal to the second preset value.

8. A control device for an energy storage system, characterized in that, The energy storage system includes a flywheel energy storage device and a battery connected in parallel to a power supply device, and the control device includes: A determination module that determines the voltage fluctuation value of the power supply device; A control module that controls the flywheel energy storage device and / or the battery to discharge or charge according to the voltage fluctuation value and the remaining power of the flywheel energy storage device.

9. A computer-readable storage medium, characterized in that, A control program of the energy storage system is stored on the computer-readable storage medium. When the control program of the energy storage system is executed by a processor, the device installed with the control program of the energy storage system implements the control method of the energy storage system according to any one of claims 1-7.

10. A computer program product, characterized in that, The computer program product includes a computer program. When the computer program is executed by a processor, it implements the control method of the energy storage system according to any one of claims 1-7.

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