Power adjusting method, power adjusting device and energy storage system

Abstract

The invention provides a power adjustment method, a power adjustment device and an energy storage system, the method is applied to an energy management system in the energy storage system, the energy storage system further comprises an electricity meter, a power grid and at least one power conversion system, and the method comprises the steps of obtaining power of the power grid from the electricity meter in real time through a first communication channel, the first communication channel is a special communication channel for transmitting the real-time power of the power grid in at least two communication channels deployed between the energy management system and the electricity meter; adjusting a first power based on the power of the power grid to obtain a second power, wherein the first power is the last total power of the at least one power conversion system; and sending a power control instruction to the at least one power conversion system in a broadcast mode based on the second power, so that a difference value between the total power output by the at least one power conversion system based on the power control instruction and the load power meets a threshold condition. By adopting the method, the control efficiency of the output power of the power conversion system can be improved.

Description

Technical Field

[0001] This application relates to the field of energy storage system technology, and in particular to a power regulation method, a power regulation device, and an energy storage system. Background Technology

[0002] To balance system stability, load, and computational complexity, Energy Management Systems (EMS) employ second-level control delays, adjusting the output power of the Power Conversion System (PCS) based on grid power, Battery Management System (BMS) power, and PCS power. However, under conditions of rapid grid power fluctuations, these second-level control delays severely lag system power regulation, making timely control of the PCS's output power impossible. Summary of the Invention

[0003] This application provides a power adjustment method, a power adjustment device, and an energy storage system, which can improve the control efficiency of the output power of the power conversion system.

[0004] In a first aspect, this application provides a power adjustment method applied to an energy management system in an energy storage system, the energy storage system including an electricity meter, a power grid, and at least one power conversion system, the method comprising:

[0005] The power of the power grid is obtained in real time from the electricity meter through the first communication channel. At least two communication channels are deployed between the energy management system and the electricity meter. The first communication channel is a dedicated communication channel for transmitting the real-time power of the power grid among the at least two communication channels.

[0006] The first power is adjusted based on the power of the power grid to obtain the second power, wherein the first power is the previous total power of the at least one power conversion system;

[0007] Based on the second power, a power control command is broadcast to the at least one power conversion system so that the difference between the total power output by the at least one power conversion system based on the power control command and the load power satisfies a threshold condition.

[0008] Secondly, this application also provides a power adjustment device applied to an energy management system in an energy storage system to execute the power adjustment method provided in the first aspect, wherein the energy storage system includes an electricity meter, a power grid, and at least one power conversion system, and the device includes:

[0009] The acquisition module is used to acquire the power of the power grid from the electricity meter in real time through the first communication channel. At least two communication channels are deployed between the energy management system and the electricity meter. The first communication channel is a dedicated communication channel for transmitting the real-time power of the power grid among the at least two communication channels.

[0010] An adjustment module is used to adjust a first power based on the power of the power grid to obtain a second power, wherein the first power is the previous total power of the at least one power conversion system;

[0011] The transmitting module is configured to broadcast a power control command to the at least one power conversion system based on the second power, so that the difference between the total power output by the at least one power conversion system based on the power control command and the load power satisfies a threshold condition.

[0012] Thirdly, this application also provides an energy storage system, including an energy management system, an electricity meter, a power grid, and at least one power conversion system that implements the power adjustment method provided in the first aspect.

[0013] The power adjustment method provided in this application utilizes an energy storage system including an energy management system, an electricity meter, a power grid, and at least one power conversion system. The energy management system obtains the power of the power grid from the electricity meter in real time through a first communication channel. At least two communication channels are deployed between the energy management system and the electricity meter. The first communication channel is a dedicated communication channel for transmitting the real-time power of the power grid among the at least two communication channels. The first power is adjusted based on the power of the power grid to obtain a second power. The first power is the previous total power of at least one power conversion system. Based on the second power, a power control command is broadcast to at least one power conversion system so that the difference between the total power output by at least one power conversion system based on the power control command and the load power satisfies a threshold condition. As can be seen, at least two communication channels are deployed between the energy management system and the electricity meter. The energy management system can obtain the real-time power of the power grid from the electricity meter through a dedicated communication channel that transmits the real-time power of the power grid. Based on the real-time power of the power grid, the total power of at least one power conversion system can be adjusted to obtain the current total power of at least one power conversion system. Since the power of the power grid is obtained through a dedicated communication channel, the efficiency or rate of power acquisition from the power grid can be improved, and the power acquisition delay can be reduced. This enables sub-second-level control of the power conversion system's power based on the power grid's power, thereby improving the control efficiency of the power conversion system's output power. Furthermore, since the difference between the total output power of at least one power conversion system and the load power meets a threshold condition, the load can be powered by the power conversion system, and the power conversion system can be prevented from feeding power back to the power grid. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic flowchart of a power adjustment method provided in an embodiment of this application;

[0016] Figure 2 This is a schematic diagram of a network architecture provided in an embodiment of this application;

[0017] Figure 3 This is a schematic flowchart of another power adjustment method provided in an embodiment of this application;

[0018] Figure 4 This is a schematic diagram of the structure of a power adjustment device provided in an embodiment of this application;

[0019] Figure 5 This is a schematic diagram of an energy storage system provided in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein.

[0022] This application provides a power adjustment method, apparatus, computer equipment, and computer-readable storage medium, which can improve the control efficiency of the output power of a power conversion system.

[0023] Figure 1 This is a schematic flowchart of a power adjustment method provided in an embodiment of this application. The method is applied to an EMS (Energy Management System) in an energy storage system. The energy storage system includes an electricity meter, a power grid, and at least one power conversion system. The electricity meter is used to detect the power of the power grid. Figure 1 As shown, the power adjustment method may include steps 101-103.

[0024] 101. Obtain the power of the power grid from the electricity meter in real time through the first communication channel.

[0025] At least two communication channels are deployed between the EMS and the electricity meter. These communication channels are used for communication, i.e., for data transmission. The first communication channel is a dedicated channel for transmitting the real-time power of the power grid, specifically for this purpose. Therefore, the first communication channel is the sub-second communication channel between the EMS and the electricity meter. Thus, the power of the power grid can be obtained from the meter in real time through the first communication channel. Other less important data, i.e., non-critical data, can be obtained from the meter using other communication channels. The electricity meter is used to detect the power of the power grid. Therefore, the power detected by the meter is the power of the power grid, i.e., the real-time power of the power grid. For example, the refresh rate of the first communication channel is less than 100 milliseconds.

[0026] A first power acquisition request can be sent to the electricity meter via the first communication channel. A first response from the electricity meter, including the power of the power grid, can also be received via the first communication channel. Immediately afterwards, a second power acquisition request can be sent to the electricity meter via the first communication channel. If no response is received for the second power acquisition request within a preset time after the preset time has elapsed, a third power acquisition request can be sent to the electricity meter immediately via the first communication channel. Therefore, if the EMS receives a power response from the electricity meter within a preset time after sending the power acquisition request via the first communication channel, it can immediately send another power acquisition request to the electricity meter via the first communication channel. If no power response is received after sending the first power acquisition request, it can wait for a preset time, and after waiting for the preset time, it can immediately send another power acquisition request to the electricity meter via the first communication channel. The power acquisition request is used to obtain the power of the power grid detected by the electricity meter. Thus, the EMS can obtain the power of the power grid from the electricity meter in real time via the first communication channel, achieving sub-second-level power acquisition.

[0027] 102. Adjust the first power based on the power of the power grid to obtain the second power.

[0028] The first power is the previous total power of at least one power conversion system, which is the previous total power of all power conversion systems. The first power is determined by the EMS when it last controlled the power of the power conversion systems. The second power is the current total power of at least one power conversion system, which is the current total power of all power conversion systems.

[0029] The first power can be adjusted based on the power of the power grid to obtain the second power. Therefore, the total power of at least one power conversion system in the previous operation can be adjusted based on the real-time power of the power grid to obtain the current total power of at least one power conversion system.

[0030] 103. Based on the second power, a power control command is broadcast to at least one power conversion system so that the difference between the total power output by at least one power conversion system based on the power control command and the load power satisfies a threshold condition.

[0031] Once the second power is determined, i.e., once the total power of at least one power conversion system is determined, a power control command can be broadcast to at least one power conversion system based on the second power. The power control command is a command used to instruct the power conversion system to output the target power.

[0032] A power control command can be generated based on a second power level, and then broadcast to at least one power conversion system. This command ensures that the difference between the total power output by the at least one power conversion system and the load power satisfies a threshold condition. The threshold condition is the threshold requirement that the difference between the total power output by the at least one power conversion system and the load power must meet. Meeting the threshold condition can be achieved by the difference being within a threshold range, or by the absolute value of the difference being less than or equal to a target threshold. The threshold range can be greater than or equal to a negative target threshold and less than or equal to the target threshold, i.e., [-target threshold, target threshold]. The target threshold is a small value designed to ensure that the difference between the total power output by the at least one power conversion system and the load power is small or equal, thus ensuring that the load is powered by the power conversion system to reduce grid power consumption. This avoids using grid power during periods of high electricity costs, thereby reducing costs. The total power output by at least one power conversion system can be understood as the total output power of all power conversion systems. For example, the target threshold can be 0.5, 0.1, 0.01, or any other value less than 1.

[0033] When there is only one power conversion system, the second power can be determined as the target power. When there are M power conversion systems, the ratio of the second power to M can be determined as the target power. The power control instruction includes the target power, and the power control instruction is used to instruct the power conversion system to output the target power. M is an integer greater than 1.

[0034] exist Figure 2In the power adjustment method shown, the energy storage system includes an energy management system, an electricity meter, a power grid, and at least one power conversion system. The energy management system obtains the power of the power grid from the electricity meter in real time through a first communication channel. At least two communication channels are deployed between the energy management system and the electricity meter. The first communication channel is a dedicated communication channel for transmitting the real-time power of the power grid among the at least two communication channels. The first power is adjusted based on the power of the power grid to obtain a second power. The first power is the previous total power of at least one power conversion system. Based on the second power, a power control command is broadcast to at least one power conversion system so that the difference between the total power output by at least one power conversion system based on the power control command and the load power satisfies a threshold condition. As can be seen, at least two communication channels are deployed between the energy management system and the electricity meter. The energy management system can obtain the real-time power of the power grid from the electricity meter through a dedicated communication channel that transmits the real-time power of the power grid. Based on the real-time power of the power grid, the total power of at least one power conversion system can be adjusted to obtain the current total power of at least one power conversion system. Since the power of the power grid is obtained through a dedicated communication channel, the efficiency or rate of power acquisition from the power grid can be improved, and the power acquisition delay can be reduced. This enables sub-second-level control of the power conversion system's power based on the power grid's power, thereby improving the control efficiency of the power conversion system's output power. Furthermore, since the difference between the total output power of at least one power conversion system and the load power meets a threshold condition, the load can be powered by the power conversion system, and the power conversion system can be prevented from feeding power back to the power grid. Furthermore, since power adjustment is performed immediately after the power from the grid is obtained, there is no need to wait for all equipment data to be refreshed before power adjustment. Therefore, the triggering mechanism is an event-triggered mechanism triggered by the power of the grid. The adjustment logic can be directly and asynchronously triggered by the data update event of the grid, rather than periodically adjusted. This can improve the efficiency and stability of power control in the energy storage system, and thus greatly shorten the system response delay.

[0035] For example, Figure 2 This is a schematic diagram of a network architecture provided in an embodiment of this application. For example... Figure 2 As shown, the network architecture may include an EMS, a power grid, electricity meters, loads, at least one power conversion system, and at least one BMS. Each power conversion system corresponds one-to-one with at least one BMS. Electricity meters are electrically connected to the power grid, loads, EMS, and at least one power conversion system. The EMS is also electrically connected to at least one power conversion system and at least one BMS. Each power conversion system is electrically connected to its corresponding BMS.

[0036] The BMS includes a battery used to power the connected power conversion system.

[0037] The power conversion system is used to convert DC power to AC power to supply power to the load during peak electricity consumption periods, based on EMS control; and to convert AC power from the grid to DC power to charge the BMS during off-peak electricity consumption periods.

[0038] The power grid is used to supply power to the load when the power conversion system is insufficient, and to charge the BMS during off-peak hours.

[0039] An electricity meter is used to detect the power of the power grid.

[0040] EMS is used for real-time power control of the power grid, controlling the output power of power conversion systems. For a detailed description, please refer to the relevant description above.

[0041] Communication between the EMS and BMS can be achieved using the Modbus Transmission Control Protocol (TCP), enabling multi-socket parallel communication. Alternatively, communication between the EMS and BMS can be established using a Controller Area Network (CAN) bus. Communication between the EMS and the power conversion system can be achieved using the Modbus 485 protocol, the CAN bus, or a combination of both. In the case of communication between the EMS and the power conversion system using both Modbus 485 and CAN, power control commands sent by the EMS to the power conversion system to control its output power are transmitted via the CAN bus. The CAN bus is specifically designed for transmitting power control commands, improving transmission efficiency and thus enhancing the control efficiency of the power conversion system's output power. Communication between the EMS and the meter can also be achieved using the Modbus 485 protocol.

[0042] It should be understood that Figure 1 This is an exemplary illustration of the network architecture of this application and does not limit the network architecture of this application.

[0043] In some embodiments, adjusting a first power based on the power of the power grid to obtain a second power includes: determining the difference between the first power and the power of the power grid to obtain a first power difference; determining a first adjusted power based on the first power difference and a first adjustment coefficient; and adjusting the first power based on the first adjusted power to obtain a second power.

[0044] The difference between the first power and the power of the grid can be determined, thus obtaining the first power difference. The first power difference is the difference between the previous total power of at least one power conversion system and the real-time power of the grid.

[0045] The first adjusted power can be determined based on the first power difference and the first adjustment coefficient. The first adjusted power can be determined by multiplying the first power difference by the first adjustment coefficient, or by the ratio of the first power difference to the first adjustment coefficient.

[0046] The first power can be adjusted based on the first adjustment power to obtain the second power; that is, the first power can be adjusted using the first adjustment power to obtain the second power. The second power can be determined as the sum of the first power and the first adjustment power, or it can be determined as the difference between the first power and the first adjustment power.

[0047] For example, the second power can be represented as follows:

[0048]

[0049] in, For the second power, For first power, For the power of the power grid, This is the first adjustment factor.

[0050] After obtaining the power from the power grid, it can be first determined whether the power grid power is 0. If the power grid power is 0, the first power can be left unchanged, and a power control command can be directly broadcast to at least one power conversion system based on the first power, instructing the power conversion system to output the same power as before. If the power grid power is not 0, the first power can be adjusted based on the power grid power to obtain the second power.

[0051] In the above embodiments, the difference between the first power and the power of the power grid is determined to obtain the first power difference. Based on the first power difference and a first adjustment coefficient, a first adjustment power is determined. The first power is then adjusted based on the first adjustment power to obtain the second power. It can be seen that the first adjustment power can be determined first based on the power of the power grid, the first power, and the first adjustment coefficient, and then the first power can be adjusted based on the first adjustment power to obtain the second power. It is evident that the current total power of at least one power conversion system is obtained by adjusting the previous total power of at least one power conversion system based on the real-time power of the power grid. Different real-time power of the power grid results in different current total power for at least one power conversion system, enabling flexible control of the power conversion system's power based on the real-time power of the power grid, and effectively tracking rapid fluctuations in power grid power.

[0052] In some embodiments, the power adjustment method further includes: obtaining the correspondence between power ranges and adjustment coefficients; and obtaining a first adjustment coefficient corresponding to the power of the power grid based on the correspondence between power ranges and adjustment coefficients.

[0053] The correspondence between power range and adjustment coefficient can be understood as the correspondence between the power range and adjustment coefficient of the power grid.

[0054] The power grid can be pre-divided into multiple power ranges, and different adjustment coefficients can be set for different power ranges. The correspondence between power ranges and adjustment coefficients can then be stored for later retrieval.

[0055] After obtaining the power from the power grid each time, the correspondence between the power range and the adjustment coefficient can be obtained. Then, based on this correspondence, the first adjustment coefficient corresponding to the power grid's power can be determined. Alternatively, the power range corresponding to the power grid's power can be determined first, thus obtaining the target power range. Then, based on the correspondence between the power range and the adjustment coefficient, the adjustment coefficient corresponding to the target power range can be determined as the first adjustment coefficient.

[0056] In the above embodiments, since the power range corresponding to the power of the power grid is different, the corresponding first adjustment coefficient is different. Therefore, the corresponding adjustment coefficient can be obtained based on the power of the power grid, which can improve the flexibility and adaptability of the adjustment coefficient, and thus ensure the accuracy and adaptability of the determined second power.

[0057] In some embodiments, the power range includes a first power range and a second power range, wherein the power value of the first power range is greater than the power value of the second power range. Based on the correspondence between the power range and the adjustment coefficient, the first adjustment coefficient corresponding to the power of the power grid is obtained, including: when the power of the power grid is in the first power range, determining the first adjustment coefficient as a first value, wherein the first value is less than 1; when the power of the power grid is in the second power range, determining the first adjustment coefficient as a second value, wherein the second value is greater than or equal to 1.

[0058] The power grid can be pre-divided into two power ranges, which may include a first power range and a second power range. The power value of the first power range is greater than the power value of the second power range. An adjustment coefficient can be set to a first value for the first power range and a second value for the second power range. The first value is less than 1. For example, the first value can be 0.2, 0.5, or any other value less than 1. The second value is greater than or equal to 1. For example, the second value can be 1 or a value greater than 1.

[0059] When the power grid's output is within the first power range, setting the first adjustment coefficient to a first value can prevent grid oscillations caused by excessive adjustment power, thus improving grid stability. When the power grid's output is within the second power range, setting the first adjustment coefficient to a second value can prevent grid feeding, i.e., grid reverse current.

[0060] For example, the power range of the power grid may include (-∞, 0] and (0, +∞), with a first adjustment factor of 0.5 when the power of the power grid is greater than 0 and a first adjustment factor of 1 when the power of the power grid is less than or equal to 0.

[0061] In the above embodiments, when the power grid power is within the first power range, determining the first adjustment coefficient to a first value can avoid grid oscillations caused by excessive adjustment power, thereby improving grid stability. When the power grid power is within the second power range, determining the first adjustment coefficient to a second value can prevent grid power outages.

[0062] In some embodiments, the power adjustment method further includes: correcting the second power to obtain a third power; and broadcasting a power control command to at least one power conversion system based on the second power, including: broadcasting the power control command to at least one power conversion system based on the third power.

[0063] Since the actual output power of the power conversion system may differ from the expected output power, in order to reduce the gap between the actual output power and the expected output power of the power conversion system, the second power can be corrected to obtain the third power. Then, a power control command can be generated based on the third power. The power control command can be broadcast to at least one power conversion system so that the absolute value of the difference between the total power output by at least one power conversion system based on the power control command and the load power is less than or equal to a threshold.

[0064] When there is only one power conversion system, the third power can be determined as the target power. When there are M power conversion systems, the ratio of the third power to M can be determined as the target power. The power control instruction includes the target power, and the power control instruction is used to instruct the power conversion system to output the target power. M is an integer greater than 1.

[0065] The second power can be corrected using a linear accumulation method, a proportional-integral (PI) control method, a proportional-integral-derivative (PID) control method, or other functional methods.

[0066] The first power is the previous expected total power of at least one power conversion system, i.e., the previous expected total power of at least one power conversion system. The second power is the current expected total power of at least one power conversion system, i.e., the current expected total power of at least one power conversion system. The third power is the power corrected for the current expected total power of at least one power conversion system, i.e., the total power output by the EMS to at least one power conversion system in this operation.

[0067] In the above embodiments, after determining the expected total power of at least one power conversion system, the expected total power of the at least one power conversion system is corrected. Based on the corrected total power of the at least one power conversion system, the error of the at least one power conversion system can be corrected, thereby improving the accuracy and precision of power control. Furthermore, transmitting the power control command via broadcast improves the transmission efficiency of the power control command, especially when there are multiple power conversion systems.

[0068] In some embodiments, correcting the second power to obtain a third power includes: determining the difference between the second power and the power of the grid to obtain a second power difference; determining a second adjusted power based on the second power difference and a second adjustment coefficient; and adjusting a fourth power based on the second adjusted power to obtain a third power, wherein the first power is the previous expected total power of at least one power conversion system, and the fourth power is the previous total power output to at least one power conversion system.

[0069] The first power is the previously desired total power of at least one power conversion system, which is the sum of the previously desired output power of all power conversion systems. The fourth power is the previously output power to at least one power conversion system, which is the product of the target power included in the previous power control command and the number of power conversion systems.

[0070] The difference between the second power and the power of the grid can be determined to obtain the second power difference. The second power is the expected total power of at least one power conversion system in this current operation. The first power difference is the difference between the expected total power of at least one power conversion system in this current operation and the real-time power of the grid.

[0071] The second adjusted power can be determined based on the second power difference and the second adjustment coefficient. The second adjusted power can be determined by multiplying the second power difference by the second adjustment coefficient, or by the ratio of the second power difference to the second adjustment coefficient. The second adjustment coefficient is a fixed value, which can be between 0.1 and 0.5. For example, the second adjustment coefficient can be 0.2, 0.3, 0.4, or other values ​​between 0.1 and 0.5. The second adjustment coefficient can prevent power oscillations in the entire system.

[0072] The third power can be obtained by adjusting the fourth power based on the second adjustment power. The third power can be determined by the sum of the fourth power and the second adjustment power, or by the difference between the fourth power and the second adjustment power.

[0073] For example, the third power can be represented as follows:

[0074]

[0075] in, For the third power, It is the fourth power. This is the second adjustment factor.

[0076] It should be understood that this embodiment describes the correction of the second power using a linear accumulation method.

[0077] In the above embodiments, the total power sent to at least one power conversion system this time is obtained by correcting the total power sent to at least one power conversion system last time with the real-time power of the power grid and the expected total power of at least one power conversion system this time. The total power sent to at least one power conversion system this time is different depending on the real-time power of the power grid, which can realize real-time control of the power conversion system power based on the real-time power of the power grid.

[0078] In some embodiments, the power adjustment method further includes: adjusting the second power to obtain a fifth power when the second power is outside a preset range, the fifth power being within a preset range; and sending a power control command to at least one power conversion system in a broadcast manner based on the second power, including: sending the power control command to at least one power conversion system in a broadcast manner based on the fifth power.

[0079] To avoid grid overload or power feeding into the grid, the total output power of all power conversion systems must be kept within a certain range. Therefore, to determine the second power, we can first check whether the second power is within a preset range. If the second power is within the preset range, we can send a power control command to at least one power conversion system in a broadcast manner based on the second power.

[0080] If the second power is outside the preset range, it indicates that the total power output of all power conversion systems may cause grid overload or power feed into the grid. Therefore, in order to avoid load overload and overshoot, the second power can be adjusted to obtain the fifth power, so that the fifth power is within the preset range.

[0081] If the second power is outside the preset range, it can be determined whether the second power is less than the minimum value of the preset range or greater than the maximum value of the preset range. If the second power is less than the minimum value of the preset range, the minimum value of the preset range can be determined as the fifth power. If the second power is greater than the maximum value of the preset range, the maximum value of the preset range can be determined as the fifth power, so as to ensure that the fifth power is within the preset range.

[0082] In the above embodiments, when the second power is outside the preset range, the second power is adjusted so that the adjusted power is within the preset range, which can avoid load overload and overshoot.

[0083] Figure 3 This is a schematic flowchart of another power adjustment method provided in an embodiment of this application. The method is applied to an EMS in an energy storage system, which includes an electricity meter, a power grid, and at least one power conversion system. The electricity meter is used to detect the power of the power grid. Figure 3 As shown, the power adjustment method may include the following steps.

[0084] 301. Obtain the power of the power grid from the electricity meter in real time through the first communication channel.

[0085] For a detailed description of step 301, please refer to the description of step 101, which will not be repeated here.

[0086] 302. Adjust the first power based on the power of the power grid to obtain the second power.

[0087] For a detailed description of step 302, please refer to the description of step 102, which will not be repeated here.

[0088] 303. Correct the second power to obtain the third power.

[0089] For a detailed description of step 303, please refer to the relevant description above, and it will not be repeated here.

[0090] 304. If the third power is outside the preset range, adjust the third power to obtain the fifth power.

[0091] To avoid overloading the power conversion system, the total output power of all power conversion systems must be kept within a certain range. Therefore, to obtain the third power, it can be determined whether the third power is within the preset range. If the third power is within the preset range, a power control command can be sent to at least one power conversion system in a broadcast manner based on the third power.

[0092] If the third power is outside the preset range, it indicates that the total power output of all power conversion systems may cause the power conversion system to overload. Therefore, in order to avoid overloading the power conversion system, the third power can be adjusted to obtain the fifth power, so that the fifth power is within the preset range.

[0093] If the third power is outside the preset range, it can be determined whether the third power is less than the minimum value of the preset range or greater than the maximum value of the preset range. If the third power is less than the minimum value of the preset range, the minimum value of the preset range can be determined as the fifth power. If the third power is greater than the maximum value of the preset range, the maximum value of the preset range can be determined as the fifth power, so as to ensure that the fifth power is within the preset range.

[0094] 305. Based on the fifth power, a power control command is broadcast to at least one power conversion system so that the difference between the total power output by at least one power conversion system based on the power control command and the load power satisfies a threshold condition.

[0095] After obtaining the fifth power, i.e., determining the total power output to at least one power conversion system, a power control command can be broadcast to at least one power conversion system based on the fifth power. The power control command is a command used to instruct the power conversion system to output the target power.

[0096] A power control command can be generated based on the fifth power level, and then broadcast to at least one power conversion system so that the difference between the total power output by at least one power conversion system based on the power control command and the load power satisfies a threshold condition. For a detailed description, please refer to the relevant description above.

[0097] When there is only one power conversion system, the fifth power can be determined as the target power. When there are M power conversion systems, the ratio of the fifth power to M can be determined as the target power. The power control instruction includes the target power; the power control instruction is used to instruct the power conversion system to output the target power. M is an integer greater than 1.

[0098] exist Figure 3In the power adjustment method shown, at least two communication channels are deployed between the energy management system and the electricity meter. The energy management system can obtain the real-time power of the power grid from the electricity meter through dedicated communication channels. Based on the real-time power of the power grid, the system can adjust the previous total power of at least one power conversion system to obtain the current total power of at least one power conversion system. Since the power of the power grid is obtained through dedicated communication channels, the efficiency of power acquisition from the power grid can be improved, and the delay in power acquisition can be reduced. This enables sub-second-level control of the power conversion system's power based on the power grid, thereby improving the control efficiency or control rate of the power conversion system's output power. Furthermore, after determining the current expected total power of at least one power conversion system, the current expected total power of at least one power conversion system is corrected. Controlling at least one power conversion system based on the corrected total power of at least one power conversion system can correct the error of at least one power conversion system, thereby improving the accuracy and precision of the output power control of the power conversion system. Further, the power control command is sent in a broadcast manner, which can improve the transmission efficiency of the power control command, especially when there are multiple power conversion systems. Furthermore, the total power sent to at least one power conversion system is within a preset range. While pursuing extremely fast response, it effectively suppresses system oscillations, prevents load overload and overshoot, and resolves the inherent technical contradiction between speed and stability. Furthermore, since power adjustment is performed immediately after acquiring power from the grid, without waiting for all device data to be refreshed, the triggering mechanism is an event-triggered mechanism triggered by grid power. The adjustment logic can be directly and asynchronously triggered by grid data update events, rather than periodically, thereby improving the efficiency and stability of energy storage system power control and significantly reducing system response latency.

[0099] It should be understood that identical or corresponding information in different embodiments can be referenced together, and content and / or steps in different embodiments can be combined with each other. At least two embodiments in different embodiments can be combined with each other.

[0100] Based on the same concept, this application also provides a power adjustment device for implementing the power adjustment method described above. The solution provided by the power adjustment device is similar to the solution described in the above method; therefore, the specific limitations in the power adjustment device embodiments provided below can be found in the limitations of the power adjustment method described above, and will not be repeated here.

[0101] Figure 4This is a schematic diagram of a power adjustment device provided in an embodiment of this application. The power adjustment is applied to an energy management system in an energy storage system, which includes an electricity meter, a power grid, and at least one power conversion system. The power adjustment device may include:

[0102] The acquisition module 401 is used to acquire the power of the power grid from the electricity meter in real time through the first communication channel. At least two communication channels are deployed between the energy management system and the electricity meter. The first communication channel is a dedicated communication channel for transmitting the real-time power of the power grid among the at least two communication channels.

[0103] The adjustment module 402 is used to adjust the first power based on the power of the power grid to obtain the second power, wherein the first power is the previous total power of at least one power conversion system;

[0104] The transmitting module 403 is used to broadcast a power control command to at least one power conversion system based on a second power, so that the difference between the total power output by the at least one power conversion system based on the power control command and the load power satisfies a threshold condition.

[0105] In some embodiments, the adjustment module 402 is specifically used for:

[0106] The difference between the first power and the power of the grid is determined to obtain the first power difference;

[0107] The first adjustment power is determined based on the first power difference and the first adjustment coefficient;

[0108] The first power is adjusted based on the first adjustment power to obtain the second power.

[0109] In some embodiments, the acquisition module 401 is further configured to:

[0110] Obtain the correspondence between power ranges and adjustment coefficients;

[0111] Based on the correspondence between power ranges and adjustment coefficients, the first adjustment coefficient corresponding to the power of the power grid is obtained.

[0112] In some embodiments, the power range includes a first power range and a second power range, where the power value of the first power range is greater than the power value of the second power range. The acquisition module 401, based on the correspondence between the power range and the adjustment coefficient, acquires the first adjustment coefficient corresponding to the power of the power grid, including:

[0113] When the power of the power grid is within the first power range, the first adjustment coefficient is determined to be the first value, which is less than 1;

[0114] When the power of the power grid is in the second power range, the first adjustment coefficient is determined as the second value, and the second value is greater than or equal to 1.

[0115] In some embodiments, the power adjustment device further includes:

[0116] The correction unit is used to correct the second power to obtain the third power;

[0117] The transmitting module 403 is specifically used to transmit power control commands to at least one power conversion system in a broadcast manner based on a third power.

[0118] In some embodiments, the correction unit is specifically used for:

[0119] The difference between the second power and the power of the grid is determined to obtain the second power difference;

[0120] The second adjusted power is determined based on the second power difference and the second adjustment coefficient;

[0121] The fourth power is adjusted based on the second adjustment power to obtain the third power. The first power is the previous expected total power of at least one power conversion system, and the fourth power is the previous total power output to at least one power conversion system.

[0122] In some embodiments, the adjustment module 402 is further configured to adjust the second power when the second power is outside the preset range, so as to obtain a fifth power, wherein the fifth power is within the preset range;

[0123] The transmitting module 403 is specifically used to transmit power control commands to at least one power conversion system in a broadcast manner based on the fifth power.

[0124] Each module in the aforementioned power adjustment device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of the power adjustment device in hardware form or independent of it, or they can be stored in the memory of the power adjustment device in software form, so that the processor can call and execute the operations corresponding to each module.

[0125] In one embodiment, Figure 5 This is a schematic diagram of an energy storage system provided in an embodiment of this application. Figure 5 As shown, the energy storage system includes an energy management system that performs the power adjustment method described above, an electricity meter, a power grid, and at least one power conversion system.

[0126] In some embodiments, the energy storage system further includes at least one battery management system, which corresponds one-to-one with at least one power conversion system.

[0127] For further detailed descriptions of the energy management system, electricity meter, power grid, power conversion system, and battery management system, please refer to the relevant descriptions above, and they will not be repeated here.

[0128] It should be noted that all information involved in this application is authorized by the user or fully authorized by all parties, and the collection, use and processing of such information must comply with relevant regulations.

[0129] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0130] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A power adjustment method, characterized in that, An energy management system applied to an energy storage system, the energy storage system including an electricity meter, a power grid, and at least one power conversion system, the method comprising: The power of the power grid is obtained in real time from the electricity meter through the first communication channel. At least two communication channels are deployed between the energy management system and the electricity meter. The first communication channel is a dedicated communication channel for transmitting the real-time power of the power grid among the at least two communication channels. The first power is adjusted based on the power of the power grid to obtain the second power, wherein the first power is the previous total power of the at least one power conversion system; Based on the second power, a power control command is broadcast to the at least one power conversion system so that the difference between the total power output by the at least one power conversion system based on the power control command and the load power satisfies a threshold condition.

2. The method according to claim 1, characterized in that, The adjustment of the first power based on the power of the power grid to obtain the second power includes: The difference between the first power and the power of the power grid is determined to obtain the first power difference; The first adjustment power is determined based on the first power difference and the first adjustment coefficient; The first power is adjusted based on the first adjustment power to obtain the second power.

3. The method according to claim 2, characterized in that, The method further includes: Obtain the correspondence between power ranges and adjustment coefficients; Based on the correspondence, the first adjustment coefficient corresponding to the power of the power grid is obtained.

4. The method according to claim 3, characterized in that, The power range includes a first power range and a second power range, where the power value of the first power range is greater than the power value of the second power range. Obtaining the first adjustment coefficient corresponding to the power of the power grid based on the correspondence includes: When the power of the power grid is within the first power range, the first adjustment coefficient is determined to be a first value, which is less than 1; When the power of the power grid is within the second power range, the first adjustment coefficient is determined to be a second value, which is greater than or equal to 1.

5. The method according to claim 1, characterized in that, The method further includes: The second power is corrected to obtain the third power; The step of sending power control commands to the at least one power conversion system in a broadcast manner based on the second power includes: Based on the third power, a power control command is broadcast to the at least one power conversion system.

6. The method according to claim 5, characterized in that, The step of correcting the second power to obtain the third power includes: The difference between the second power and the power of the power grid is determined to obtain the second power difference; The second adjusted power is determined based on the second power difference and the second adjustment coefficient; The fourth power is adjusted based on the second adjustment power to obtain the third power, wherein the first power is the previous expected total power of the at least one power conversion system, and the fourth power is the previous total power output to the at least one power conversion system.

7. The method according to claim 1, characterized in that, The method includes: If the second power is outside the preset range, the second power is adjusted to obtain a fifth power, which is within the preset range; The step of sending power control commands to the at least one power conversion system in a broadcast manner based on the second power includes: Based on the fifth power, a power control command is broadcast to the at least one power conversion system.

8. A power adjustment device, characterized in that, An energy management system applied to an energy storage system to perform the power adjustment method as described in any one of claims 1-7, the energy storage system comprising an electricity meter, a power grid, and at least one power conversion system, the device comprising: The acquisition module is used to acquire the power of the power grid from the electricity meter in real time through the first communication channel. At least two communication channels are deployed between the energy management system and the electricity meter. The first communication channel is a dedicated communication channel for transmitting the real-time power of the power grid among the at least two communication channels. An adjustment module is used to adjust a first power based on the power of the power grid to obtain a second power, wherein the first power is the previous total power of the at least one power conversion system; The transmitting module is configured to broadcast a power control command to the at least one power conversion system based on the second power, so that the difference between the total power output by the at least one power conversion system based on the power control command and the load power satisfies a threshold condition.

9. An energy storage system, characterized in that, This includes an energy management system, an electricity meter, a power grid, and at least one power conversion system that performs the power adjustment method as described in any one of claims 1-7.

10. The energy storage system according to claim 9, characterized in that, The energy storage system further includes at least one battery management system, which corresponds one-to-one with the at least one power conversion system.

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