Power evaluation method, device and equipment for gravity energy storage array system

Abstract

The embodiment of the invention discloses a power evaluation method, device and equipment for a gravity energy storage array system, and the method comprises the steps: constructing a model of the gravity energy storage array system; constructing an operation state difference evaluation index based on the operation number of the gravity energy storage units and the number of weight blocks input by the gravity energy storage units; under the condition that the operation state difference evaluation index meets a preset condition, the estimated adjustment power of the gravity energy storage unit in the switching period of the weight block is determined, determining a power adjustment estimation range based on the model, the operation number of the gravity energy storage unit, the number of weight blocks input by the gravity energy storage unit, the power variation of a single weight block and the estimation adjustment power; and determining power evaluation of the gravity energy storage array system in the charging and discharging state based on the power adjustment estimation range. According to the technical scheme provided by the embodiment of the invention, the power of the gravity energy storage array system can be accurately evaluated, and a reliable basis can be provided for power dispatching.

Description

Technical Field

[0001] This application relates to the field of power transmission technology, and in particular to a power evaluation method, apparatus and equipment for a gravity energy storage array system. Background Technology

[0002] As the global energy structure shifts towards low-carbon and high-proportion renewable energy, the new power system demands a combination of multi-timescale regulation capabilities, high security, long lifespan, and low cost from energy storage technologies. Gravity energy storage, as a mechanical energy storage technology based on physical potential energy conversion, has become an important technical path to support large-scale renewable energy consumption and grid peak and frequency regulation due to its advantages such as environmental friendliness, site selection flexibility, long cycle life, and low cost per kilowatt-hour.

[0003] In the research of gravity energy storage, gravity energy storage array systems are a key supporting technology for peak shaving and valley filling of power grids and maintaining the safe and stable operation of power grid systems. In order to meet the power demand of the power grid and implement different dispatch strategies, the power assessment of gravity energy storage array systems is an important basis for the formulation of power system dispatch strategies. Therefore, accurate power assessment of gravity energy storage array systems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] This application provides a power assessment method, apparatus, and device for a gravity energy storage array system, which can accurately assess the power of the gravity energy storage array system and provide a reliable basis for power dispatch.

[0005] In a first aspect, embodiments of this application provide a power evaluation method for a gravity energy storage array system, including:

[0006] Construct a model of a gravity energy storage array system;

[0007] Based on the number of gravity energy storage units in operation in the gravity energy storage array system and the number of heavy blocks put into the gravity energy storage units, an evaluation index for the difference in operating status between the gravity energy storage units is constructed.

[0008] When the evaluation index of the difference in operating status meets the preset conditions, the estimated adjustment power of the gravity energy storage unit during the switching cycle of the heavy block is determined, and the estimated power adjustment range of the gravity energy storage array system is determined based on the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of heavy blocks put into the gravity energy storage units, the power change of a single heavy block, and the estimated adjustment power.

[0009] The power assessment of the gravity energy storage array system under charging and discharging conditions is determined based on the power adjustment prediction range and the charging and discharging state characterization of the gravity energy storage unit.

[0010] Secondly, embodiments of this application provide a power evaluation device for a gravity energy storage array system, comprising:

[0011] The model building module is used to build models of gravity energy storage array systems.

[0012] The module for constructing evaluation indicators for operational status differences is used to construct evaluation indicators for operational status differences between gravity energy storage units based on the number of gravity energy storage units in operation and the number of heavy blocks put into the gravity energy storage units in the gravity energy storage array system.

[0013] The power adjustment prediction range determination module is used to determine the estimated adjustment power of the gravity energy storage unit within the switching cycle of the heavy blocks, provided that the evaluation index of the difference in the operating state meets the preset conditions, and to determine the power adjustment prediction range of the gravity energy storage array system based on the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of heavy blocks put into the gravity energy storage units, the power change of a single heavy block, and the estimated adjustment power.

[0014] The power assessment module is used to determine the power assessment of the gravity energy storage array system under charging and discharging conditions based on the power adjustment prediction range and the charging and discharging state characterization of the gravity energy storage unit.

[0015] Thirdly, embodiments of this application provide an electronic device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements the method provided in embodiments of this application.

[0016] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed in a computer, causes the computer to perform the method provided in embodiments of this application.

[0017] The technical solution provided in this application constructs an evaluation index for the operational state differences among gravity energy storage units. When this evaluation index meets preset conditions, the estimated power adjustment range of the gravity energy storage array system is determined by considering the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of deployed heavy blocks, the power change of a single heavy block, and the estimated adjustment power of the gravity energy storage units during the heavy block switching cycle. Based on this range, the power assessment of the gravity energy storage array system under charging and discharging conditions is determined. In other words, by considering the operational state difference evaluation index, the operational state differences among the various gravity energy storage units within the gravity energy storage array system are taken into account. This effectively avoids power circulation between the various gravity energy storage units caused by excessive operational state differences, thereby effectively avoiding inaccurate power assessment of the gravity energy storage array system. Accurate power assessment can be achieved, providing a reliable basis for power dispatch. Attached Figure Description

[0018] Figure 1 This is a flowchart of a power evaluation method for a gravity energy storage array system provided in an embodiment of this application;

[0019] Figure 2 This is a structural block diagram of a power evaluation device for a gravity energy storage array system provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of an electronic device structure provided in an embodiment of this application. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a flowchart of a power evaluation method for a gravity energy storage array system provided in an embodiment of this application. The method can be executed by a power evaluation device for the gravity energy storage array system. The device can be implemented by software and / or hardware and can be configured in an electronic device such as a computer.

[0023] like Figure 1 As shown, the technical solutions provided in this application include:

[0024] S110: Construct a model of a gravity energy storage array system.

[0025] In this embodiment, the gravity energy storage array system can be a vertical matrix-type gravity energy storage system, which uses an elevator car to raise or lower heavy objects. The gravity energy storage array system consists of multiple gravity energy storage units connected in parallel. For a single gravity energy storage unit, its working principle is mainly to achieve electromechanical energy conversion by driving a synchronous machine through discrete heavy objects. Based on the above principle, the active power control link of the k-th gravity energy storage unit is constructed, and the model of the gravity energy storage array system is built.

[0026] In one implementation, the gravity energy storage array system model is constructed based on the following formula:

[0027]

[0028] Among them, T i,k Let m be the input mechanical torque of the i-th weight block in the k-th gravity energy storage unit; m be the mass per unit weight block; g be the gravitational acceleration; v be the velocity of the weight block; η be the efficiency of converting gravitational potential energy into electrical energy; S be the input mechanical torque of the i-th weight block in the k-th gravity energy storage unit; m be the mass per unit weight block; g be the gravitational acceleration; v be the velocity of the weight block; η be the efficiency of converting n,k T represents the rated capacity of the k-th gravity energy storage unit; m,k T represents the total input mechanical torque of the k-th gravity energy storage unit. m_gra,k T represents the input mechanical torque of the k-th gravity energy storage unit. e,k T represents the electromagnetic torque of the k-th gravity energy storage unit. j,k Let D be the inertial time constant of the k-th gravity energy storage unit. k δ is the damping coefficient of the k-th gravity energy storage unit; k ω is the power angle of the k-th gravity energy storage unit; ω0 is the synchronous speed of the gravity energy storage unit; ω k N represents the electrical angular velocity of the k-th gravity energy storage unit. block,k The number of weight blocks put into the k-th gravity energy storage unit.

[0029] Therefore, by constructing the model of the gravity energy storage array system described above, subsequent power assessments can be conducted based on this model, and the power assessment can be carried out using the topology corresponding to this model.

[0030] S120: Based on the number of gravity energy storage units in operation in the gravity energy storage array system and the number of heavy blocks put into the gravity energy storage units, construct an evaluation index for the difference in operating status between the gravity energy storage units.

[0031] In this embodiment, based on the current operating status of the gravity energy storage array system, the number of corresponding gravity energy storage units in operation within the gravity energy storage array system and the number of heavy blocks deployed by each gravity energy storage unit under the current operating status are obtained, thereby realizing the analysis of the operating status of each gravity energy storage unit within the gravity energy storage array system and constructing an evaluation index for the difference in operating status.

[0032] In one embodiment of this application, the operating state difference index is constructed based on the following formula:

[0033]

[0034] Among them, D ff The evaluation index for the difference in operating status; N block,m The number of weight blocks put into the m-th gravity energy storage unit.

[0035] Among them, the operational status difference evaluation index can measure the operational differences among the various gravity energy storage units in a gravity energy storage array system, avoiding excessive differences in operational status between gravity energy storage units, which could lead to biases in the power assessment of the gravity energy storage array system. In this embodiment, when assessing the power of the gravity energy storage array system, it is necessary to consider the differences in operational status among the various gravity energy storage units. This avoids power circulation between the various gravity energy storage units caused by excessive differences in operational status, which could result in the output power of the gravity energy storage array system not being the sum of the output power of all gravity energy storage units, thus leading to inaccurate power assessment of the gravity energy storage array system. Therefore, it is necessary to construct an operational status difference evaluation index.

[0036] S130: When the evaluation index of the difference in the operating state meets the preset conditions, determine the estimated adjustment power of the gravity energy storage unit during the switching cycle of the heavy block, and determine the estimated power adjustment range of the gravity energy storage array system based on the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of heavy blocks put into the gravity energy storage units, the power change of a single heavy block, and the estimated adjustment power.

[0037] In this embodiment, when evaluating the power of a gravity energy storage array system, it is necessary to consider that the evaluation index for operational state differences meets preset conditions. This effectively avoids inaccurate power evaluation caused by power circulation between the various gravity energy storage units due to excessive differences in operational states. Specifically, meeting the preset conditions for the operational state difference evaluation index can mean that the evaluation index is less than a preset value, or that other conditions are met, to effectively avoid power circulation between the various gravity energy storage units.

[0038] In this embodiment, the number of gravity energy storage units in operation can be used as a basis, combined with the power change corresponding to a single heavy block in the gravity energy storage unit and the time interval ΔT required for switching between adjacent heavy blocks. gra (Switching cycle of the weight block), determine ΔT gra Estimated adjustment power of internal gravity energy storage units.

[0039] Specifically, determining the estimated adjustment power of the gravity energy storage unit during the switching cycle of the heavy blocks includes: determining the estimated adjustment power based on the power change of a single heavy block and the number of heavy blocks put into the gravity energy storage unit.

[0040] The estimated adjustment power is determined based on the following formula:

[0041] d gra =N block,k ·P single

[0042] Where, d gra For the estimated adjustment power; P single The power change of a single weight block in the gravity energy storage unit; the switching period is the time interval ΔT required for switching between adjacent weight blocks. gra .

[0043] In this embodiment of the application, the power adjustment estimation range of the gravity energy storage array system includes the power adjustment estimation range of the output power of the gravity energy storage array system and the power adjustment estimation range of the absorbed power of the gravity energy storage array system.

[0044] In this embodiment of the application, the number of gravity energy storage units in the gravity energy storage array system can be set to N based on the model of the gravity energy storage array system. gra Each gravity energy storage unit can have a maximum of N weight blocks. For ease of explanation, we define the number of gravity energy storage units in operation as k, denoted as gravity energy storage unit 1, gravity energy storage unit 2, ..., gravity energy storage unit k. When the gravity energy storage array system outputs power (releases electricity), the number of weight blocks deployed by each gravity energy storage unit is denoted as... If the gravity energy storage array system absorbs power (electricity) from the grid, the number of weights deployed by each gravity energy storage unit is denoted as follows:

[0045] In this embodiment, when the gravity energy storage array system is operating at its output power, the weights within each gravity energy storage unit are in a falling state. At this time, the adjustable power of the gravity energy storage array system reaches its maximum when the number of weights simultaneously added to / removed from each gravity energy storage unit is maximized. Therefore, the estimated range for power adjustment of the gravity energy storage output power is determined based on the following formula:

[0046]

[0047] in, and These represent the maximum and minimum power output to the grid by the gravity energy storage array system at time t, respectively. N represents the number of weight blocks deployed by the k-th gravity energy storage unit when the gravity energy storage array system is outputting power; gra P represents the number of gravity energy storage units in operation. single N represents the power change corresponding to a single weight. block,m The number of weight blocks put into the m-th gravity energy storage unit.

[0048] In this embodiment, when the gravity energy storage array system is operating in the power absorption mode, the weight blocks in each gravity energy storage unit are in an upward operating state. At this time, the gravity energy storage array uses the number of weight blocks simultaneously added / removed from each gravity energy storage unit to maximize the adjustable power of the gravity energy storage array system. Then, the power adjustment prediction range for gravity energy storage to absorb power is determined based on the following formula:

[0049]

[0050] in, and These represent the maximum and minimum power that the gravity energy storage array system is expected to absorb from the grid at time t, respectively. The number of weight blocks deployed by the k-th gravity energy storage unit when the gravity energy storage array system absorbs power.

[0051] S140: Based on the power adjustment prediction range and the charge / discharge state characterization of the gravity energy storage unit, determine the power assessment of the gravity energy storage array system under charge / discharge conditions.

[0052] In this embodiment, the charging and discharging state of the gravity energy storage unit can be determined based on the model of the gravity energy storage array system, and the power assessment of the gravity energy storage array system under the charging and discharging state can be determined by combining the power adjustment prediction range of the gravity energy storage array system.

[0053] According to the model (topology) of the gravity energy storage array system, when the grid dispatch command is issued, the charging and discharging states of each gravity energy storage unit in the gravity energy storage array system should be consistent, that is, both should be in a discharging state or a charging state at the same time.

[0054] Specifically, the charge / discharge state characterization of the gravity energy storage unit satisfies the following relationship:

[0055]

[0056] in, This is the state representation of the absorbed power of the k-th gravity energy storage unit, that is, the state representation of the k-th gravity energy storage unit in the charging state. This is the state representation of the output power of the k-th gravity energy storage unit, that is, the state representation of the k-th gravity energy storage unit in the discharge state.

[0057] in, At that time, the kth gravity energy storage unit is in the power absorption state; When, it indicates that the k-th gravity energy storage unit is in an idle state;

[0058] in, At that time, the kth gravity energy storage unit is in the output power state; This indicates that the k-th gravity energy storage unit is in an idle state.

[0059] In this embodiment of the application, determining the power assessment of the gravity energy storage array system in the charging and discharging state may include: determining the power assessment of the gravity energy storage array system in the discharging state based on the state characterization of the gravity energy storage array system in the discharging state and the power adjustment range of the output power; and determining the power assessment of the gravity energy storage array in the charging state based on the state characterization of the gravity energy storage array system in the charging state and the power adjustment prediction range of the absorbed power.

[0060] Specifically, when the gravity energy storage array system is in the discharge state, the power assessment of the gravity energy storage array system in the discharge state is determined based on the following formula:

[0061]

[0062] in, Estimate the maximum power output to the grid by the gravity energy storage array system at time t; The minimum power output to the grid by the gravity energy storage array system at time t is estimated.

[0063] When the gravity energy storage array system is in the discharge state, the power assessment of the gravity energy storage array system in the charging state is determined based on the following formula:

[0064]

[0065] in, Estimate the maximum power absorbed by the gravity energy storage array system into the grid at time t;

[0066] The minimum power output to the grid by the gravity energy storage array system at time t is estimated.

[0067] Therefore, by using the above formula for power assessment, accurate power assessment of gravity energy storage array systems can be achieved, providing a reliable basis for power dispatch.

[0068] The technical solution provided in this application constructs an evaluation index for the operational state differences among gravity energy storage units. When this evaluation index meets preset conditions, the estimated power adjustment range of the gravity energy storage array system is determined by considering the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of deployed heavy blocks, the power change of a single heavy block, and the estimated adjustment power of the gravity energy storage units during the heavy block switching cycle. Based on this range, the power assessment of the gravity energy storage array system under charging and discharging conditions is determined. In other words, by considering the operational state difference evaluation index, the operational state differences among the various gravity energy storage units within the gravity energy storage array system are taken into account. This effectively avoids power circulation between the various gravity energy storage units caused by excessive operational state differences, thereby effectively avoiding inaccurate power assessment of the gravity energy storage array system. Accurate power assessment can be achieved, providing a reliable basis for power dispatch.

[0069] Figure 2 This is a structural block diagram of a power evaluation device for a gravity energy storage array system provided in an embodiment of this application, such as... Figure 2 As shown, the device includes:

[0070] Model building module 210 is used to build a model of the gravity energy storage array system;

[0071] The operational status difference evaluation index construction module 220 is used to construct an operational status difference evaluation index between the gravity energy storage units based on the number of gravity energy storage units in operation in the gravity energy storage array system and the number of heavy blocks put into the gravity energy storage units.

[0072] The power adjustment prediction range determination module 230 is used to determine the estimated adjustment power of the gravity energy storage unit within the switching cycle of the heavy blocks when the operating state difference evaluation index meets the preset conditions, and to determine the power adjustment prediction range of the gravity energy storage array system based on the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of heavy blocks put into the gravity energy storage units, the power change of a single heavy block, and the estimated adjustment power.

[0073] The power assessment module 240 is used to determine the power assessment of the gravity energy storage array system under charging and discharging conditions based on the power adjustment prediction range and the charging and discharging state characterization of the gravity energy storage unit.

[0074] In one alternative implementation, the model of the gravity energy storage array system is constructed based on the following formula:

[0075]

[0076] Among them, T i,k Let m be the input mechanical torque of the i-th weight block in the k-th gravity energy storage unit; m be the mass per unit weight block; g be the gravitational acceleration; v be the velocity of the weight block; η be the efficiency of converting gravitational potential energy into electrical energy; S be the input mechanical torque of the i-th weight block in the k-th gravity energy storage unit; m be the mass per unit weight block; g be the gravitational acceleration; v be the velocity of the weight block; η be the efficiency of converting n,k T represents the rated capacity of the k-th gravity energy storage unit; m,k T represents the total input mechanical torque of the k-th gravity energy storage unit. m_gra,k T represents the input mechanical torque of the k-th gravity energy storage unit. e,k T represents the electromagnetic torque of the k-th gravity energy storage unit. j,k Let D be the inertial time constant of the k-th gravity energy storage unit. k δ is the damping coefficient of the k-th gravity energy storage unit; k ω is the power angle of the k-th gravity energy storage unit; ω0 is the synchronous speed of the gravity energy storage unit; ω k N represents the electrical angular velocity of the k-th gravity energy storage unit. block,k The number of weight blocks put into the k-th gravity energy storage unit.

[0077] In one optional implementation, the operational status difference evaluation index is constructed based on the following formula:

[0078]

[0079] Among them, D ff The evaluation index for the difference in operating status; N block,m The number of weight blocks put into the m-th gravity energy storage unit.

[0080] In one optional implementation, determining the estimated adjustment power of the gravity energy storage unit during the switching cycle of the heavy block includes:

[0081] The estimated adjustment power is determined based on the power change of a single weight block and the number of weight blocks deployed by the gravity energy storage unit.

[0082] The estimated adjustment power is determined based on the following formula:

[0083] d gra =N block,k ·P single

[0084] Where, d gra For the estimated adjustment power; P single The power change of a single weight block; the switching cycle is the time interval required for switching between adjacent weight blocks.

[0085] In one optional implementation, the power adjustment estimation range includes the power adjustment estimation range for the output power of the gravity energy storage array system and the power adjustment estimation range for the absorbed power of the gravity energy storage array system.

[0086] The power adjustment range for the output power of the gravity energy storage array system is determined based on the following formula:

[0087]

[0088] in, and These represent the maximum and minimum power output to the grid by the gravity energy storage array system at time t, respectively. N represents the number of weight blocks deployed by the k-th gravity energy storage unit when the gravity energy storage array system is outputting power; gra N represents the number of gravity energy storage units in operation; block,m The number of weight blocks put into the m-th gravity energy storage unit;

[0089] The power adjustment range for the absorbed power of the gravity energy storage array system is determined based on the following formula:

[0090]

[0091] in, and These represent the maximum and minimum power that the gravity energy storage array system is expected to absorb from the grid at time t, respectively. The number of weight blocks deployed by the k-th gravity energy storage unit when the gravity energy storage array system absorbs power.

[0092] In one optional implementation, the charge / discharge state characterization of the gravity energy storage unit satisfies the following relationship:

[0093]

[0094] in, This is the state representation of the absorbed power of the k-th gravity energy storage unit, that is, the state representation of the k-th gravity energy storage unit in the charging state. This is the state representation of the output power of the k-th gravity energy storage unit, that is, the state representation of the k-th gravity energy storage unit in the discharge state.

[0095] in, At that time, the kth gravity energy storage unit is in the power absorption state; When, it indicates that the k-th gravity energy storage unit is in an idle state;

[0096] in, At that time, the kth gravity energy storage unit is in the output power state; This indicates that the k-th gravity energy storage unit is in an idle state.

[0097] In one alternative implementation, the power assessment of the gravity energy storage array system in the discharge state is determined based on the following formula:

[0098]

[0099] in, Estimate the maximum power output to the grid by the gravity energy storage array system at time t; The minimum power output to the grid by the gravity energy storage array system at time t is estimated.

[0100] The power assessment of the gravity energy storage array system in the charging state is determined based on the following formula:

[0101]

[0102] in, Estimate the maximum power absorbed by the gravity energy storage array system into the grid at time t;

[0103] The minimum power output to the grid by the gravity energy storage array system at time t is estimated.

[0104] like Figure 3 As shown in the figure, this application provides an electronic device, including a processor 111, a communication interface 112, a memory 113, and a communication bus 114, wherein the processor 111, the communication interface 112, and the memory 113 communicate with each other through the communication bus 114.

[0105] Memory 113 is used to store computer programs;

[0106] In one embodiment of this application, when the processor 111 executes a program stored in the memory 113, it implements the method provided in any of the foregoing method embodiments, including:

[0107] Construct a model of a gravity energy storage array system;

[0108] Based on the number of gravity energy storage units in operation in the gravity energy storage array system and the number of heavy blocks put into the gravity energy storage units, an evaluation index for the difference in operating status between the gravity energy storage units is constructed.

[0109] When the evaluation index of the difference in operating status meets the preset conditions, the estimated adjustment power of the gravity energy storage unit during the switching cycle of the heavy block is determined, and the estimated power adjustment range of the gravity energy storage array system is determined based on the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of heavy blocks put into the gravity energy storage units, the power change of a single heavy block, and the estimated adjustment power.

[0110] The power assessment of the gravity energy storage array system under charging and discharging conditions is determined based on the power adjustment prediction range and the charging and discharging state characterization of the gravity energy storage unit.

[0111] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the method provided in any of the foregoing method embodiments.

[0112] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0113] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented using software plus a general-purpose hardware platform, or of course, using hardware. Based on this understanding, the above technical solutions, in essence or the parts that contribute to the related technology, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0114] The above embodiments are merely illustrative examples and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A power evaluation method for a gravity energy storage array system, characterized in that, include: Construct a model of a gravity energy storage array system; Based on the number of gravity energy storage units in operation in the gravity energy storage array system and the number of heavy blocks put into the gravity energy storage units, an evaluation index for the difference in operating status between the gravity energy storage units is constructed. When the evaluation index of the difference in operating status meets the preset conditions, the estimated adjustment power of the gravity energy storage unit during the switching cycle of the heavy block is determined, and the estimated power adjustment range of the gravity energy storage array system is determined based on the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of heavy blocks put into the gravity energy storage units, the power change of a single heavy block, and the estimated adjustment power. The power assessment of the gravity energy storage array system under charging and discharging conditions is determined based on the power adjustment prediction range and the charging and discharging state characterization of the gravity energy storage unit.

2. The method according to claim 1, characterized in that, The model of the gravity energy storage array system is constructed based on the following formula: Among them, T i,k Let m be the input mechanical torque of the i-th weight block in the k-th gravity energy storage unit; m be the mass per unit weight block; g be the gravitational acceleration; v be the velocity of the weight block; η be the efficiency of converting gravitational potential energy into electrical energy; S be the input mechanical torque of the i-th weight block in the k-th gravity energy storage unit; m be the mass per unit weight block; g be the gravitational acceleration; v be the velocity of the weight block; η be the efficiency of converting n,k T represents the rated capacity of the k-th gravity energy storage unit; m,k T represents the total input mechanical torque of the k-th gravity energy storage unit. m_gra,k T represents the input mechanical torque of the k-th gravity energy storage unit. e,k T represents the electromagnetic torque of the k-th gravity energy storage unit. j,k Let D be the inertial time constant of the k-th gravity energy storage unit. k δ is the damping coefficient of the k-th gravity energy storage unit; k ω is the power angle of the k-th gravity energy storage unit; ω0 is the synchronous speed of the gravity energy storage unit; ω k N represents the electrical angular velocity of the k-th gravity energy storage unit. block,k The number of weight blocks put into the k-th gravity energy storage unit.

3. The method according to claim 2, characterized in that, The evaluation index for operational status differences is constructed based on the following formula: Among them, D ff The evaluation index for the difference in operating status; N block,m The number of weight blocks put into the m-th gravity energy storage unit.

4. The method according to claim 2, characterized in that, The determination of the estimated adjustment power of the gravity energy storage unit during the switching cycle of the heavy block includes: The estimated adjustment power is determined based on the power change of a single weight block and the number of weight blocks deployed by the gravity energy storage unit. The estimated adjustment power is determined based on the following formula: d gra =N block,k ·P single Where, d gra For the estimated adjustment power; P single The power change of a single weight block; the switching cycle is the time interval required for switching between adjacent weight blocks.

5. The method according to claim 4, characterized in that, The power adjustment prediction range includes the power adjustment prediction range for the output power of the gravity energy storage array system and the power adjustment prediction range for the absorbed power of the gravity energy storage array system. The power adjustment range for the output power of the gravity energy storage array system is determined based on the following formula: in, and These represent the maximum and minimum power output to the grid by the gravity energy storage array system at time t, respectively. N represents the number of weight blocks deployed by the k-th gravity energy storage unit when the gravity energy storage array system is outputting power; gra N represents the number of gravity energy storage units in operation; block,m The number of weight blocks put into the m-th gravity energy storage unit; The power adjustment range for the absorbed power of the gravity energy storage array system is determined based on the following formula: in, and These represent the maximum and minimum power that the gravity energy storage array system is expected to absorb from the grid at time t, respectively. The number of weight blocks deployed by the k-th gravity energy storage unit when the gravity energy storage array system absorbs power.

6. The method according to claim 5, characterized in that, The charge / discharge state characterization of the gravity energy storage unit satisfies the following relationship: in, This is the state representation of the absorbed power of the k-th gravity energy storage unit, that is, the state representation of the k-th gravity energy storage unit in the charging state. This is the state representation of the output power of the k-th gravity energy storage unit, that is, the state representation of the k-th gravity energy storage unit in the discharge state. in, At that time, the kth gravity energy storage unit is in the power absorption state; When, it indicates that the k-th gravity energy storage unit is in an idle state; in, At that time, the kth gravity energy storage unit is in the output power state; This indicates that the k-th gravity energy storage unit is in an idle state.

7. The method according to claim 6, characterized in that, The power assessment of the gravity energy storage array system under discharge conditions is determined based on the following formula: in, Estimate the maximum power output to the grid by the gravity energy storage array system at time t; The minimum power output to the grid by the gravity energy storage array system at time t is estimated. The power assessment of the gravity energy storage array system in the charging state is determined based on the following formula: in, Estimate the maximum power absorbed by the gravity energy storage array system into the grid at time t; The minimum power output to the grid by the gravity energy storage array system at time t is estimated.

8. A power evaluation device for a gravity energy storage array system, characterized in that, include: The model building module is used to build models of gravity energy storage array systems. The module for constructing evaluation indicators for operational status differences is used to construct evaluation indicators for operational status differences between gravity energy storage units based on the number of gravity energy storage units in operation and the number of heavy blocks put into the gravity energy storage units in the gravity energy storage array system. The power adjustment prediction range determination module is used to determine the estimated adjustment power of the gravity energy storage unit within the switching cycle of the heavy blocks, provided that the evaluation index of the difference in the operating state meets the preset conditions, and to determine the power adjustment prediction range of the gravity energy storage array system based on the model of the gravity energy storage array system, the number of gravity energy storage units in operation, the number of heavy blocks put into the gravity energy storage units, the power change of a single heavy block, and the estimated adjustment power. The power assessment module is used to determine the power assessment of the gravity energy storage array system under charging and discharging conditions based on the power adjustment prediction range and the charging and discharging state characterization of the gravity energy storage unit.

9. An electronic device, characterized in that, It includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed in a computer, causes the computer to perform the method described in any one of claims 1-7.

Images