A power balancing method and system for a power system

Abstract

The application discloses a power balancing method and system of a power system, and belongs to the technical field of power system control. The method comprises the following steps: determining an adjustable power of an energy storage resource; determining a backup cutting combination space; determining a to-be-cut combination from a plurality of backup cutting combinations based on a power adjustment amount of the power system; determining a cutting deviation amount of each to-be-cut combination based on the adjustable power, the power adjustment amount of the energy storage device and a power cutting amount of each to-be-cut combination; determining a target combination from the to-be-cut combinations based on a plurality of cutting deviation amounts, and determining an adjustable power of the energy storage device corresponding to the target combination; cutting the target combination, and adjusting the energy storage device according to the adjustable power, so that the power of the power system tends to be balanced. By determining the target combination as the optimal cutting object, and determining the adjustable power of the energy storage device, and simultaneously adjusting the power of the energy storage device, over-adjustment and under-adjustment in the adjustment process are effectively reduced, the accuracy of power adjustment is improved, and the safety of the power system is improved.

Description

Technical Field

[0001] This application belongs to the field of power system control technology, specifically relating to a power system power balance method and system. Background Technology

[0002] When a power system experiences a fault and faces power shortage or surplus, requiring emergency control measures to intervene, it is necessary to search all available switchable equipment / power sources and find the optimal combination of switchable equipment / power sources and energy storage power adjustment / decrease to match the power lost or surplus due to the fault.

[0003] However, existing regulation methods cannot guarantee finding the optimal solution for the combination of cut-off and energy storage regulation, which affects power system regulation. Summary of the Invention

[0004] Purpose of this application: This application provides a power balancing method for power systems to address the problem that existing regulation methods cannot guarantee finding the optimal solution for the combination of power cut-off and energy storage regulation, thus affecting grid regulation; this application also provides a power balancing system for power systems.

[0005] Technical solution: This application provides a power balancing method for a power system, wherein the power system includes energy storage devices, power sources, and electrical appliances; the power balancing method includes:

[0006] Determine the adjustable power of the energy storage device;

[0007] Determine a backup switching combination space, which includes multiple backup switching combinations, and the multiple backup switching combinations include power supply combinations and electrical equipment combinations;

[0008] The switching combination is determined from a plurality of backup switching combinations based on the power demand of the power system.

[0009] Based on the adjustable power, the power adjustment amount, and the power cut-off amount of each of the cut-off combinations, the cut-off deviation amount of each of the cut-off combinations is determined;

[0010] Based on the multiple cut-off deviations, a target combination is determined from the combinations to be cut, and the adjustment power of the energy storage device corresponding to the target combination is determined;

[0011] The target combination is disconnected, and the energy storage device is adjusted according to the adjustment power to make the power of the power system tend to be balanced.

[0012] In some embodiments, determining the cut-off deviation for each of the energy storage devices based on the adjustable power, the power demand of the energy storage device, and the power cut-off amount for each of the cut-off combinations includes:

[0013] The energy storage regulation amount is determined based on the adjustable power, the power demand, and the power cut-off amount for each of the combinations to be cut.

[0014] The cut-off deviation of each of the said energy storage regulation amounts, the power demand adjustment amounts, and the power cut-off amounts of each of the said cut-off combinations is determined based on the energy storage regulation amount, the power demand adjustment amount, and the power cut-off amount of each of the said cut-off combinations.

[0015] In some embodiments, the adjustable power is configured to include adjustable power up and adjustable power down.

[0016] In some embodiments, determining the energy storage regulation amount based on the adjustable power, the power demand, and the power cut-off amount includes:

[0017] The remaining power is obtained based on the power demand adjustment and the power cut-off amount;

[0018] In response to the remaining power being negative, the smaller of the absolute value of the remaining power and the adjustable power is determined as the energy storage regulation amount.

[0019] In some embodiments, determining the energy storage regulation amount based on the adjustable power, the power demand, and the power cut-off amount further includes:

[0020] In response to the remaining power being positive, the smaller of the absolute value of the remaining power and the adjustable power is determined as the energy storage regulation amount.

[0021] In some embodiments, determining the switching combination from a plurality of backup switching combinations based on the power demand adjustment of the power system includes:

[0022] When the power demand adjustment is negative, the electrical equipment combination is identified as the combination to be cut.

[0023] When the power adjustment requirement is positive, the power supply combination is determined as the combination to be switched.

[0024] In some embodiments, the power adjustment requirement is determined by the following steps:

[0025] When the current power state of the power system is a power deficit, the power demand adjustment is determined to be negative;

[0026] When the current power state is one of excess power, the power adjustment requirement is determined to be a positive value.

[0027] In some embodiments, determining a target combination from the combinations to be cut, and the regulating power of the energy storage device corresponding to the target combination, based on a plurality of said cut-off deviations, includes:

[0028] Determine the minimum value among the plurality of said resection deviations;

[0029] The combination to be cut corresponding to the minimum value is determined as the target combination.

[0030] In some embodiments, determining a target combination from the combinations to be cut, and the regulating power of the energy storage device corresponding to the target combination, based on a plurality of said cut-off deviations, further includes:

[0031] In response to the fact that there are multiple minimum values, the power value of the combination to be cut corresponding to each minimum value is obtained;

[0032] The combination to be cut, corresponding to the smallest power value among the multiple power values, is determined as the target combination.

[0033] In some embodiments, determining a target combination from the combinations to be cut, and the regulating power of the energy storage device corresponding to the target combination, based on a plurality of said cut-off deviations, further includes:

[0034] In response to the fact that there are multiple minimum power values, the number of cutting devices corresponding to each minimum power value of the combination to be cut is obtained;

[0035] The combination of items to be cut that has the fewest number of cutting devices is determined as the target combination.

[0036] In some embodiments, the adjustable power and the adjustable power are determined by the energy storage converter of the energy storage device.

[0037] Accordingly, this application also provides a power balancing system for a power system, used to execute the power balancing method for a power system as described in the above embodiments, wherein the power system includes energy storage devices, power sources, and electrical appliances, and the power balancing system includes:

[0038] An adjustable power determination module is configured to determine the adjustable power of the energy storage device;

[0039] The backup switch combination space determination module is configured to determine the backup switch combination space, which includes multiple backup switch combinations, and the multiple backup switch combinations include power supply combinations and electrical equipment combinations.

[0040] The module for determining the switching combination is configured to determine the switching combination from a plurality of the alternative switching combinations based on the power demand adjustment of the power system.

[0041] The cut-off deviation determination module is configured to determine the cut-off deviation of each of the cut-off combinations based on the adjustable power, the power adjustment requirement, and the power cut-off amount of each of the cut-off combinations.

[0042] The target combination determination module is configured to determine a target combination from the combinations to be cut, and the adjustment power of the energy storage device corresponding to the target combination, based on a plurality of the cut-off deviations.

[0043] The cut-off module is configured to cut off the target combination and adjust the energy storage device according to the adjustment power so that the power of the power system tends to be balanced.

[0044] Beneficial Effects: Compared with the prior art, the embodiments of this application provide a power balancing method for a power system, the power system including energy storage devices, power sources, and electrical appliances; the power balancing method includes: determining the adjustable power of the energy storage devices; determining a backup switching combination space, the backup switching combination space including multiple backup switching combinations, the multiple backup switching combinations including power source combinations and electrical appliance combinations; determining a switching combination from the multiple backup switching combinations based on the power demand of the power system; determining a switching deviation for each switching combination based on the adjustable power, the power demand, and the power switching amount of each switching combination; determining a target combination from the switching combinations based on the multiple switching deviations, and the adjustable power of the energy storage devices corresponding to the target combination; switching the target combination, and adjusting the energy storage devices according to the adjustable power, so that the power of the power system tends to be balanced. Thus, this application determines the target combination from the combinations to be cut by combining the adjustable power of the energy storage device, the power demand, and the power cut-off amount of the combination to be cut, so as to be the optimal cut-off target, and determines the adjustment power of the energy storage device corresponding to the target combination. At the same time, the power of the energy storage device is adjusted to effectively reduce over-adjustment and under-adjustment in the adjustment process, improve the accuracy of power regulation of the power system, and improve the security of the power system.

[0045] It is understood that, compared with the prior art, the power balancing system of the power system provided in this application includes all the technical features and effects of the power balancing method of the power system described above, and will not be repeated here. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a first flowchart illustrating the power balance system of a power system provided in an embodiment of this application.

[0048] Figure 2 This is a second flowchart illustrating the power balance method for a power system provided in an embodiment of this application.

[0049] Figure 3 A flowchart illustrating step S4 in the power balance method for a power system provided in this application embodiment;

[0050] Figure 4 This is a schematic diagram of the power balance system of the power system provided in an embodiment of this application. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application 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 application described herein can be implemented in orders other than those illustrated or described herein. In the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or devices.

[0053] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of exemplary embodiments and may not be to scale. The modules or processes shown in the drawings are not necessarily essential for implementing this application and therefore should not be used to limit the scope of protection of this application.

[0054] The applicant found that when a power system experiences a fault and faces power shortage or surplus, requiring emergency control measures to intervene, energy storage regulation can be considered first. After the energy storage equipment has fully utilized its own regulation capacity, the required regulation amount minus the energy storage regulation amount is used as the target value. The optimal combination of electrical equipment / power supply is then sought to get as close to the target value as possible. However, this method cannot guarantee finding the optimal solution for the combination of power cut-off and energy storage regulation, thus affecting grid regulation.

[0055] In view of this, embodiments of this application provide a power balancing method for a power system, which determines a target combination from the combinations to be cut by combining the adjustable power, adjustable power, power demand of the energy storage device, and the power cut-off amount of the combination to be cut, as well as the adjustment power of the energy storage device corresponding to the target combination, so as the optimal cut-off target, thereby solving at least part of the above-mentioned technical problems.

[0056] Please see Figure 1 and Figure 2 , Figure 1 This application illustrates a first flowchart of a power balance system for a power system provided in an embodiment of the present application. Figure 2 This illustrates a second flowchart of the power balancing method for a power system provided in an embodiment of this application.

[0057] This application provides a power balancing method for a power system, which includes energy storage devices, power sources, and electrical appliances, and is a system that organically integrates power sources, power grids, electrical appliances, and energy storage devices. The power balancing method includes the following steps S1 to S6.

[0058] Step S1: Determine the adjustable power of the energy storage device. Specifically, by determining the adjustable power of the energy storage device, this embodiment of the application can accurately grasp the specific range of capabilities of the energy storage device in power regulation. Especially when a power system failure occurs, this not only helps to better plan and utilize energy storage resources in power regulation, but also provides a strong basis for decision-making in response to various complex power supply and demand changes.

[0059] In some embodiments, the adjustable power is configured to include adjustable power up and adjustable power down. Specifically, adjustable power up refers to the power that the energy storage device needs to increase, referred to as energy storage up adjustment, which means increasing the discharge power or decreasing the charging power of the energy storage. Adjustable power down refers to the power that the energy storage device needs to decrease, referred to as energy storage down adjustment, which means decreasing the discharge power or increasing the charging power of the energy storage. Therefore, in this embodiment, the energy storage adjustment amount is negative when energy storage is up adjusted, and positive when energy storage is down adjusted. In this way, the adjustable power is subdivided into adjustable power up and adjustable power down, enabling the energy storage device to more accurately match the real-time power demand changes of the power system. When the power system experiences a power shortage, the energy storage device can quickly perform energy storage up adjustment, i.e., increase the discharge power or decrease the charging power, to replenish the power system in a timely manner and effectively suppress frequency decline; while when the power system has excess power, energy storage down adjustment, i.e., decrease the discharge power or increase the charging power, absorbs the excess power and prevents frequency rise. This two-way and precise adjustment method greatly improves the power system's ability to cope with power fluctuations and ensures that the power system's frequency and voltage remain within the allowable range.

[0060] In some embodiments, the adjustable power is determined by the energy storage converter of the energy storage device. Specifically, the energy storage converter, as the power conversion interface between the energy storage device and the power grid, can monitor the operating status and power demand of the power grid in real time, and quickly adjust the output power of the energy storage device according to the instructions of the power system. This enables rapid determination and precise control of the adjustable power, thereby providing active power support or absorbing excess power to the power system in a timely and effective manner, and maintaining the stable operation of the power system.

[0061] Step S2 involves determining the standby combination space, which includes multiple standby combinations, comprising power supply combinations and electrical equipment combinations. It is understood that power balance is crucial in power systems, and the multiple standby combinations in the standby combination space provide various power regulation possibilities. Therefore, this embodiment of the application constructs a standby combination space covering a variety of different power supply combinations and electrical equipment combinations. After a power system fault, the optimal power supply combination or electrical equipment combination can be flexibly selected according to the actual needs and operating status of the power system, achieving optimized power allocation, improving power utilization efficiency, and reducing the operating costs of the power system.

[0062] Step S3: Determine the switching combination from multiple backup combinations based on the power demand of the power system. Specifically, the power demand is obtained through detection when a power imbalance occurs in the power system, such as when a power system fault occurs; detecting the power system will then yield the power demand. Thus, this application selects the switching combination based on the specific power demand of the power system, allowing for more targeted power adjustments. This ensures that the selected switching combination can maximally meet the power regulation needs of the power system, thereby achieving a more precise power balance and reducing the adverse effects of power imbalance.

[0063] In some embodiments, step S3 determines the switching combination from multiple backup switching combinations based on the power demand of the power system, including: when the power demand is negative, determining the equipment combination as the switching combination; when the power demand is positive, determining the power supply combination as the switching combination. Specifically, when the power demand of the power system is negative, it indicates that there is a power shortage in the power system. In this case, determining the equipment combination as the switching combination can quickly and effectively reduce the number of equipment in the power system, so that the power can be balanced. When the power demand of the power system is positive, it means that there is a power surplus in the power system. In this case, determining the power supply combination as the switching combination can quickly reduce the power supply capacity of the power system to meet the power demand. It can be seen that the embodiments of this application improve the efficiency and accuracy of power regulation through this targeted operation, quickly respond to power changes in the power system, and take corresponding effective measures in the shortest possible time, whether there is a power shortage or a power surplus, to improve the stability and reliability of the power system and ensure the quality and continuity of power supply.

[0064] In some embodiments, the power demand of energy storage devices is determined through the following steps: when the current power state of the power system is a power deficit, the power demand is determined to be negative; when the current power state of the power system is a power surplus, the power demand is determined to be positive. That is, when the power system is in a power deficit state, determining the power demand as negative accurately reflects that the current power demand of the power system is directed towards increasing power input. Similarly, when the current power state is a power surplus state, determining the power demand as positive clarifies that the power system currently has excess power that needs to be addressed. This provides a clear direction for power regulation in the power system.

[0065] Step S4: Based on the adjustable power, power demand, and the power cut-off amount for each to-be-cut combination, determine the cut-off deviation for each to-be-cut combination. Specifically, by comprehensively considering the adjustable power, power demand, and power cut-off amount, this embodiment of the application can more accurately determine the degree of influence of each to-be-cut combination on the power system balance, thereby selecting the most effective to-be-cut combination from among many to-be-cut combinations for cut-off. This ensures that the selected to-be-cut combination can meet the power regulation needs of the power system to the greatest extent, achieving precise power regulation and avoiding over-regulation or under-regulation.

[0066] Please see Figure 3 , Figure 3This illustration shows a flowchart of step S4 in the power balancing method for a power system provided in an embodiment of this application. In some embodiments, step S4 determines the cut-off deviation of each to-be-cut combination based on adjustable power, power demand, and the power cut-off amount of each to-be-cut combination, including: step S41, determining the energy storage regulation amount based on adjustable power, power demand, and the power cut-off amount of each to-be-cut combination; step S42, determining the cut-off deviation of each to-be-cut combination based on the energy storage regulation amount, power demand, and the power cut-off amount of each to-be-cut combination. Specifically, by comprehensively considering the adjustable power, power demand, and the power cut-off amount of each to-be-cut combination to determine the energy storage regulation amount, the regulation capacity that the power system can provide under the current conditions can be more accurately grasped. Therefore, when there is a power imbalance, the charging and discharging strategy of the power system can be planned more precisely, improving the accuracy and reliability of power regulation. Meanwhile, determining the cut-off deviation based on the energy storage regulation, power demand regulation, and the power cut-off amount of each cut-off combination can fully consider the regulation effect of the power system and the impact of the cut-off combination on the power system power balance, making the determined cut-off deviation more scientific and reasonable, and providing a more accurate basis for selecting the optimal cut-off combination.

[0067] In some embodiments, the shearing deviation is obtained according to the following formula:

[0068] ΔP=P dem -(P set +P regular (1),

[0069] Where ΔP is the shearing deviation, P dem For power adjustment, P set P is the power cut-off amount. regular This is the energy storage regulation quantity.

[0070] In some embodiments, step S41 determines the energy storage regulation amount based on adjustable power, power demand, and power cut-off amount, including: obtaining the remaining power based on the obtained power demand and power cut-off amount; and determining the smaller of the absolute value of the remaining power and the adjustable power as the energy storage regulation amount in response to a negative remaining power. Specifically, determining the remaining power by obtaining the power demand and power cut-off amount provides a clear understanding of the actual power gap or surplus of the power system after considering the cut-off of the combination to be cut, providing accurate basic data for subsequently determining the energy storage regulation amount, enabling energy storage devices to perform power regulation more effectively. When the remaining power is negative, it indicates that the power system still has a power deficit. In this case, determining the smaller of the absolute value of the remaining power and the adjustable power as the energy storage regulation amount ensures that the energy storage device adjusts within its adjustable range, avoiding over-adjustment that could lead to overload or instability of the energy storage device. Simultaneously, it also fully utilizes the adjustable power of the energy storage device to maximize the satisfaction of the power system's power demand.

[0071] In some embodiments, step S41, which determines the energy storage regulation amount based on adjustable power, power demand, and power cut-off, further includes: determining the smaller of the absolute value of the remaining power and the adjustable power as the energy storage regulation amount in response to a positive remaining power. Similarly, when the remaining power is positive, it indicates that the power system has a power surplus. Determining the smaller of the absolute value of the remaining power and the adjustable power as the energy storage regulation amount allows for precise determination of the power absorption capacity of the energy storage device based on the actual surplus of the power system. This avoids overcharging or undercharging, enabling the energy storage device to efficiently store excess energy when there is a power surplus, preparing for potential power shortages in the future.

[0072] In some embodiments, the energy storage regulation amount is obtained according to the following formula:

[0073]

[0074] Among them, P remain For the remaining power, P dem For power adjustment, P set P is the power cut-off amount. regular P is the energy storage regulation quantity. increase To allow for adjustable power, P reduce The power can be reduced.

[0075] Step S5: Based on multiple cut-off deviations, a target combination and the corresponding energy storage device's regulation power are determined from the combinations to be cut off. This embodiment analyzes multiple cut-off deviations to accurately select the target combination best suited to the current power system state from multiple combinations to be cut off, along with the corresponding energy storage device's regulation power, i.e., the energy storage regulation amount. Thus, by determining the target combination and the corresponding energy storage device's regulation power, the power distribution in the power system can be precisely adjusted according to the actual cut-off deviation. When the power system experiences power deficit or surplus, the corresponding target combination is selected for cut-off. Simultaneously, the energy storage device can respond quickly, absorbing or releasing power to maintain power balance in the power system, preventing significant fluctuations in frequency and voltage, thereby enhancing power system stability. Therefore, this application, while meeting the power regulation requirements of the energy storage device, optimizes the power balance of the power system to the greatest extent, avoiding over-regulation or under-regulation, and ensuring stable operation of the power system.

[0076] In some embodiments, step S5 determines a target combination from the combinations to be cut off, and the regulating power of the energy storage device corresponding to the target combination, based on multiple cut-off deviations. This includes: determining the minimum value among the multiple cut-off deviations; and determining the combination to be cut off corresponding to the minimum value as the target combination. In other words, this application determines the combination to be cut off that has the least impact on the current power balance of the power system and best meets the power regulation requirements as the target combination. This ensures that when performing power regulation, the power balance of the power system is achieved in the most accurate and efficient way, avoiding unnecessary impacts from over-adjustment and maximizing the stable operation of the power system. Furthermore, since the combination to be cut off with the smallest cut-off deviation is selected, it means that while meeting the power regulation requirements, this combination requires relatively minimal changes or utilization of various resources in the power system, such as power sources and electrical equipment. This achieves optimized resource utilization, avoids resource waste, and enables the entire power system to operate in a more economical and efficient state.

[0077] In some embodiments, step S5, based on multiple cutoff deviations, determines a target combination from the combinations to be cut off, and the regulating power of the energy storage device corresponding to the target combination. This further includes: in response to the multiple minimum values, obtaining the power value of the combination to be cut off corresponding to each minimum value; and determining the combination to be cut off corresponding to the minimum power value among the multiple power values ​​as the target combination. Specifically, when multiple minimum cutoff deviations occur, a unique target combination cannot be determined solely based on the cutoff deviations. In this case, by comparing the power values ​​of the combinations to be cut off corresponding to each minimum value, selecting the combination with the smallest power value as the target combination helps to prioritize the cutoff of the combination with the least impact on the power system, ensuring stable operation of the power system while minimizing the impact on normal power supply. Furthermore, using the combination to be cut off with the smallest power value as the target combination enables the power system to control the cutoff deviation with minimal power loss during adjustment, improving the overall operating efficiency of the power system, avoiding unnecessary power waste due to improper selection, effectively reducing power surges caused by cutoff operations, and helping to maintain the stability of the power system.

[0078] In some embodiments, step S5, based on multiple cut-off deviations, determines a target combination from the combinations to be cut off, and the regulating power of the energy storage device corresponding to the target combination. It further includes: in response to the existence of multiple minimum power values, obtaining the number of devices to be cut off for each minimum power value corresponding to the combination to be cut off; and determining the combination to be cut off with the fewest devices to be cut off as the target combination. Thus, this application can minimize the impact of equipment changes involved in the cut-off operation on the power system. It is understood that fewer equipment operations reduce the likelihood of voltage fluctuations, electromagnetic interference, and other instabilities in the power system, helping the power system maintain a more stable operating state, ensuring the stability and reliability of power supply, and further enhancing the safety and stability of the power system when responding to power adjustments.

[0079] Step S6: Disconnect the target combination and adjust the energy storage device according to the adjusted power to bring the power of the power system towards balance. Please refer again. Figure 2 In this embodiment, after a power system fault occurs, the adjustable power and adjustable power of the energy storage are first obtained. Then, based on the positive or negative value of the functional adjustment demand, it is determined from the standby combination space whether the combination to be switched is a power supply combination or a power consumption equipment combination. Next, the power adjustment demand and the switching deviation are obtained for the combination to be switched. Finally, the optimal adjustment combination, i.e., the target combination, is found from the standby combination space through a certain algorithm, the target combination is switched, and the energy storage equipment is adjusted according to the adjustment power to make the power of the power system tend to be balanced, thus completing the power regulation of the power system. The certain algorithm can be one or more of the following: traversal method, greedy algorithm, and particle swarm optimization algorithm.

[0080] In summary, this application determines the target combination from the combinations to be cut by combining the adjustable power of the energy storage device, the power demand, and the power cut-off amount of the combination to be cut. This target combination serves as the optimal cut-off target. The application also determines the adjustment power of the energy storage device corresponding to the target combination and adjusts the power of the energy storage device simultaneously. This effectively reduces over-adjustment and under-adjustment during the adjustment process, improves the accuracy of power system power regulation, and enhances power system security. In other words, it decouples the continuously adjusted energy storage regulation from the discretely adjusted power consumption / power supply regulation, making the final target combination more precise, effectively reducing over-adjustment and under-adjustment, minimizing interference to power system users, and improving the overall operating efficiency and reliability of the power system.

[0081] Accordingly, please refer to Figure 4 , Figure 4 This application illustrates a schematic diagram of the power balancing system provided in an embodiment of the present application. The present application also provides a power balancing system for executing the power balancing method of the power system as described in the above embodiments. The power system includes energy storage devices, power sources, and electrical appliances. The power balancing system includes: an adjustable power determination module, a backup switching combination space determination module, a combination to be switched determination module, a switching deviation determination module, a target combination determination module, and a switching module. The system includes the following modules: an adjustable power determination module for determining the adjustable power of the energy storage device; a backup combination space determination module for determining the backup combination space, which includes multiple backup combinations, each consisting of a power supply combination and a power consumption device combination; a cut-off combination determination module for determining the cut-off combination from the multiple backup combinations based on the power demand of the power system; a cut-off deviation determination module for determining the cut-off deviation of each cut-off combination based on the adjustable power, the power demand, and the power cut-off amount of each cut-off combination; a target combination determination module for determining the target combination from the cut-off combinations based on the multiple cut-off deviations, and the adjustable power of the energy storage device corresponding to the target combination; and a cut-off module for cutting off the target combination and adjusting the energy storage device according to the adjustable power to achieve power balance in the power system.

[0082] It is understood that, compared with the prior art, the power balancing system of the power system provided in this application includes all the technical features and effects of the power balancing method of the power system described above, and will not be repeated here.

[0083] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0084] The power balancing method and system for a power system provided in the embodiments of this application have been described in detail above, and specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A power balance method for a power system, characterized in that, The power system includes energy storage devices, power sources, and electrical appliances; the power balancing method includes: Determine the adjustable power of the energy storage device; Determine a backup switching combination space, which includes multiple backup switching combinations, and the multiple backup switching combinations include power supply combinations and electrical equipment combinations; The switching combination is determined from a plurality of backup switching combinations based on the power demand of the power system. Based on the adjustable power, the power adjustment amount, and the power cut-off amount of each of the cut-off combinations, the cut-off deviation amount of each of the cut-off combinations is determined; Based on the multiple cut-off deviations, a target combination is determined from the combinations to be cut, and the adjustment power of the energy storage device corresponding to the target combination is determined; The target combination is disconnected, and the energy storage device is adjusted according to the adjustment power to make the power of the power system tend to be balanced.

2. The power balance method for a power system according to claim 1, characterized in that, Based on the adjustable power, the power adjustment requirement, and the power cut-off amount for each of the cut-off combinations, the cut-off deviation for each of the cut-off combinations is determined, including: The energy storage regulation amount is determined based on the adjustable power, the power demand, and the power cut-off amount for each of the combinations to be cut. The cut-off deviation of each of the said energy storage regulation amounts, the power demand adjustment amounts, and the power cut-off amounts of each of the said cut-off combinations is determined based on the energy storage regulation amount, the power demand adjustment amount, and the power cut-off amount of each of the said cut-off combinations.

3. The power balance method for a power system according to claim 2, characterized in that, The adjustable power is configured to include adjustable power up and adjustable power down.

4. The power balance method for a power system according to claim 3, characterized in that, Determining the energy storage regulation amount based on the adjustable power, the power demand, and the power cut-off amount includes: The remaining power is obtained based on the power demand adjustment and the power cut-off amount; In response to the remaining power being negative, the smaller of the absolute value of the remaining power and the adjustable power is determined as the energy storage regulation amount.

5. The power balance method for a power system according to claim 4, characterized in that, Determining the energy storage regulation amount based on the adjustable power, the power demand, and the power cut-off amount further includes: In response to the remaining power being positive, the smaller of the absolute value of the remaining power and the adjustable power is determined as the energy storage regulation amount.

6. The power balance method for a power system according to claim 1, characterized in that, Determining the switching combination from multiple backup switching combinations based on the power demand regulation of the power system includes: When the power demand adjustment is negative, the electrical equipment combination is identified as the combination to be cut. When the power adjustment requirement is positive, the power supply combination is determined as the combination to be switched.

7. The power balance method for a power system according to claim 6, characterized in that, The required power adjustment is determined through the following steps: When the current power state of the power system is a power deficit, the power demand adjustment is determined to be negative; When the current power state is one of excess power, the power adjustment requirement is determined to be a positive value.

8. The power balance method for a power system according to claim 1, characterized in that, Based on multiple said shedding deviations, a target combination is determined from the combinations to be shedding, and the adjustment power of the energy storage device corresponding to the target combination is determined, including: Determine the minimum value among the plurality of said resection deviations; The combination to be cut corresponding to the minimum value is determined as the target combination.

9. The power balance method for a power system according to claim 8, characterized in that, Based on multiple said shedding deviations, a target combination is determined from the combinations to be shedding, and the regulating power of the energy storage device corresponding to the target combination is also determined, further comprising: In response to the fact that there are multiple minimum values, the power value of the combination to be cut corresponding to each minimum value is obtained; The combination to be cut, corresponding to the smallest power value among the multiple power values, is determined as the target combination.

10. The power balance method for a power system according to claim 9, characterized in that, Based on multiple said shedding deviations, a target combination is determined from the combinations to be shedding, and the regulating power of the energy storage device corresponding to the target combination is also determined, further comprising: In response to the fact that there are multiple minimum power values, the number of cutting devices corresponding to each minimum power value of the combination to be cut is obtained; The combination of items to be cut that has the fewest number of cutting devices is determined as the target combination.

11. The power balance method for a power system according to claim 3, characterized in that, The adjustable power and the adjustable power are determined by the energy storage converter of the energy storage device.

12. A power balance system for an electric power system, characterized in that, A power balancing method for performing a power system as described in any one of claims 1 to 11, wherein the power system includes energy storage devices, power sources, and electrical appliances, and the power balancing system includes: An adjustable power determination module is configured to determine the adjustable power of the energy storage device; The backup switch combination space determination module is configured to determine the backup switch combination space, which includes multiple backup switch combinations, and the multiple backup switch combinations include power supply combinations and electrical equipment combinations. The module for determining the switching combination is configured to determine the switching combination from a plurality of the alternative switching combinations based on the power demand adjustment of the power system. The cut-off deviation determination module is configured to determine the cut-off deviation of each of the cut-off combinations based on the adjustable power, the power adjustment requirement, and the power cut-off amount of each of the cut-off combinations. The target combination determination module is configured to determine a target combination from the combinations to be cut, and the adjustment power of the energy storage device corresponding to the target combination, based on a plurality of the cut-off deviations. The cut-off module is configured to cut off the target combination and adjust the energy storage device according to the adjustment power so that the power of the power system tends to be balanced.

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