An electric energy scheduling method and system, an electric energy device and a storage medium thereof

Abstract

The application discloses an electric energy scheduling method and system, an electric energy device and a storage medium thereof, and adopts the following method: an electric energy scheduling type of a current electric energy scheduling mode is identified and determined, the electric energy scheduling type includes a preset electric energy scheduling type and a specified electric energy scheduling type; based on the electric energy scheduling type determination result, the preset scheduling strategy or the specified scheduling strategy is used to control the corresponding AC-DC inverter under each transformer to perform electric energy scheduling on the energy storage battery cabinet in the electric energy device, and the control priority of the specified electric energy scheduling type is higher than that of the preset electric energy scheduling type, and the electric energy scheduling includes charging, discharging or / and maintaining the current operation state of the energy storage battery cabinet, wherein the preset scheduling strategy and the specified scheduling strategy both include taking the transformer balanced target load rate as the control target to control the corresponding AC-DC inverter under each transformer to perform electric energy scheduling on the energy storage battery cabinet in the electric energy device.

Description

Technical Field

[0001] This invention relates to the field of energy storage equipment and power dispatching technology, and in particular to a power dispatching method, system, power device and its storage medium. Background Technology

[0002] With rising energy costs and the advancement of "dual carbon" goals, the number of industrial and commercial users equipping their homes with photovoltaic and energy storage systems is increasing. The core value of energy storage systems lies in reducing overall electricity costs through a peak-valley arbitrage strategy of "storing during low-voltage periods and discharging during peak-voltage periods." Currently, common control strategies are mostly rule-based controls based on fixed times or fixed thresholds, such as setting fixed charging during off-peak hours and fixed discharging during peak hours.

[0003] However, this static strategy has significant drawbacks. First, it cannot adapt to dynamically changing factors, such as the randomness of photovoltaic power generation, load fluctuations, and complex time-of-use pricing structures (e.g., peak pricing), leading to lost arbitrage opportunities or even increased costs. Second, static strategies often only consider electricity costs, ignoring the depreciation of the energy storage batteries themselves due to cyclic charging and discharging. This may result in frequent charging and discharging due to small price differences, leading to "profiting from electricity costs but losing on equipment." Finally, existing strategies lack a global optimization perspective, failing to achieve balanced mutual support among multiple transformers within the power plant, making it difficult to achieve optimal total cost within the dispatch cycle.

[0004] Based on this, the present invention proposes a power dispatching method, power dispatching system, power device and its storage medium that can dynamically respond and comprehensively consider economic efficiency and equipment lifespan. Summary of the Invention

[0005] To address the aforementioned deficiencies and problems, embodiments of the present invention provide a power dispatching method, system, power device, and storage medium that can effectively overcome the aforementioned deficiencies and problems.

[0006] The first aspect of this invention provides a power dispatching method, which includes:

[0007] Identify and determine the power dispatch type of the current power dispatch mode, wherein the power dispatch type includes a preset power dispatch type and a specified power dispatch type;

[0008] Based on the power dispatch type determination result, the AC-DC inverters corresponding to each transformer are controlled to perform power dispatch on the energy storage battery cabinet in the power device according to a preset dispatch strategy or a specified dispatch strategy. The specified power dispatch type has a higher control priority than the preset power dispatch type. The power dispatch includes charging, discharging and / or maintaining the current operating state of the energy storage battery cabinet.

[0009] The preset scheduling strategy and the specified scheduling strategy both include controlling the corresponding AC-DC inverters under each transformer to perform power scheduling on the energy storage battery cabinet in the power device, with the transformer balance target load rate as the control target.

[0010] Furthermore, the step of controlling the corresponding AC-DC inverters under each transformer to perform power dispatching on the energy storage battery cabinet in the power device based on the transformer equalization target load rate as the control target further includes: using the discharge equalization target load rate as the control target. Or use the target load rate for charging balance To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

[0011] Furthermore, the target load rate for discharge balancing... To control the power dispatch of the energy storage battery cabinet in the power device by controlling the corresponding AC-DC inverters under each transformer to achieve the control target, the following further methods are included:

[0012] Based on the current active power of each transformer's load. The discharge margin power reserved for the power grid by the corresponding transformer. and the rated capacity of each transformer Calculate the initial equivalent active power of each transformer. and the current initial load rate Wherein, the initial equivalent active power The current initial load rate , where i is a natural number greater than or equal to 2;

[0013] Based on the current total equivalent active power of each transformer in the power supply unit Total rated capacity of all transformers and current power demand Calculate the target load factor for discharge balancing Wherein, the total equivalent active power The discharge equalization target load rate ,

[0014] Based on the current initial load rate of each transformer and discharge balancing target load rate By using the corresponding AC-DC inverters under each transformer to perform power dispatching on the energy storage battery cabinets in the power equipment, the operation of each transformer is controlled to be within the discharge balancing target load range. The discharge balancing target load range is based on the discharge balancing target load rate. The settings are configured, in which the charging power of each transformer is determined by... Calculated.

[0015] Furthermore, to balance the target load rate through discharge To control the power dispatching of the energy storage battery cabinet in the power unit by the AC-DC inverters corresponding to each transformer under the control target, the initial load rate of the i-th transformer before it starts discharging is calculated based on the real-time operating data collected before the discharge condition of each transformer. If the initial load rate of any transformer in the power unit before it starts discharging is less than the discharge balance target load rate, the initial load rate of the i-th transformer before it starts discharging is considered. When this occurs, the system can selectively switch to a state where the initial load rate before eliminating non-initiated discharge conditions is less than the target load rate for discharge balancing. The transformer participates in discharging to balance the target load rate. For the purpose of regulating power dispatch, or controlling the AC-DC inverter under the corresponding transformer to charge the energy storage battery cabinet in the power device.

[0016] Furthermore, the target load rate for charging balancing To control the power dispatch of the energy storage battery cabinet in the power device by controlling the corresponding AC-DC inverters under each transformer to achieve the control target, the following further methods are included:

[0017] Based on the apparent power of the current load of each transformer The charging margin power configured for energy storage in each transformer. and the rated capacity of each transformer Calculate the available capacity of each transformer and the current initial load rate The available capacity of the transformer The current initial load rate , where i is a natural number greater than or equal to 2;

[0018] Based on the current total apparent power of each transformer Available capacity of each transformer and current power demand Calculate the target load rate for charging balancing Among them, the current total apparent power of each transformer Total available capacity of all transformers The target load rate for charging balancing ;

[0019] Based on the current initial load rate of the available capacity of each transformer and the target load rate for charging balancing By using the corresponding AC-DC inverters under each transformer to perform power dispatching on the energy storage battery cabinet in the power device, the operation of each transformer is controlled to be within the charging balance target load range. The charging balance target load range is based on the charging balance target load rate. The settings are configured, in which the discharge power of each transformer is controlled by... Calculated.

[0020] Furthermore, to balance the target load rate of charging To control the power dispatching of the energy storage battery cabinet in the power unit by the AC-DC inverters corresponding to each transformer under the control target, the initial load rate of the i-th transformer is calculated based on the real-time operating data collected before the charging condition of each transformer is started. If the initial load rate of any transformer in the power unit before the charging condition is started is greater than the target load rate for charging balance, then the initial load rate of the i-th transformer is considered. When the initial load rate before eliminating charging inactive conditions is greater than the target load rate for charging balancing, the system can be switched to a state where the initial load rate is greater than the target load rate for charging balancing. Transformers participate in charging to balance the target load rate. For the purpose of regulating the power dispatch of the target, or controlling the AC-DC inverter under the corresponding transformer to discharge the energy storage battery cabinet in the power device.

[0021] Furthermore, if the current power dispatch mode is any one of the third-party power dispatch mode, user-defined power dispatch mode, or manual power dispatch mode, then the power dispatch type is determined to be the specified power dispatch type. Then, based on the current power demand specified by the third-party power dispatch mode, user-defined power dispatch mode, or manual power dispatch mode, the AC-DC inverter under the transformer is controlled according to the discharge balancing target load rate. Or the target load rate for charging balancing To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

[0022] Furthermore, if the current power dispatch mode is a peak-valley arbitrage power dispatch mode, then the current power dispatch type is determined to be a preset power dispatch type, and the AC-DC inverters under each transformer are controlled to dispatch power to the energy storage battery cabinet according to the preset dispatch strategy. The preset dispatch strategy further includes identifying and determining the time period type based on the current time information. If the current time belongs to a preset peak / peak period or a preset valley period, then the current power demand is determined based on the maximum allowable charge / discharge capacity, state of charge, and power limit of the energy storage battery cabinet, with the goal of maximizing the electricity price difference. During the preset peak / peak period, the target load rate for discharge balancing is used. To control the AC-DC inverters under each transformer to preferentially discharge the energy storage battery cabinet in the power device, the charging balance target load rate is achieved during the preset valley period. To achieve the control target, the corresponding AC-DC inverters under each transformer are controlled to prioritize charging of the energy storage battery cabinet in the power device.

[0023] Furthermore, if the current power dispatch mode is a peak-valley arbitrage power dispatch mode, it is determined to be a preset power dispatch type. The AC-DC inverters under each transformer are controlled to dispatch power to the energy storage battery cabinet according to the preset dispatch strategy. The preset dispatch strategy further includes identifying and determining the time period type based on current time information. If the current time belongs to a preset normal period, the current power demand is determined based on historical electricity consumption within a certain time period, and the target load rate for discharge balancing is used. Or the target load rate for charging balancing To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

[0024] A second aspect of the present invention provides an energy dispatching system, which further includes:

[0025] The battery stack management system communicates with the battery cluster management system and energy management system installed in the power plant site.

[0026] An energy control system is communicatively connected to a transformer load acquisition device, a battery stack management system, and an AC-DC inverter. The energy control system further includes a processor for implementing one or more computer programs as provided in the first aspect of the present invention, and a computer storage medium storing one or more computer programs, the one or more computer programs being adapted to be loaded by the processor and executed as provided in the first aspect of the present invention.

[0027] The third aspect of the present invention provides an electrical energy device, which includes an electrical energy dispatching system provided in the second aspect of the present invention and an electrical energy routing device controlled by the electrical energy dispatching system;

[0028] The power routing device further includes:

[0029] Station-level DC busbars;

[0030] Multiple AC-DC inverters are connected in parallel on their DC sides to the station-level DC busbar, and their AC sides are connected to the low-voltage side of their respective transformers.

[0031] The power supply device further includes multiple transformers and multiple energy storage battery cabinets. The low-voltage side of the transformer is electrically connected to the AC side of at least one AC-DC inverter, and the high-voltage side of the transformer is electrically connected to the power grid. The energy storage battery cabinets are connected in parallel to the station-level DC bus.

[0032] Furthermore, the electrical energy device also includes a load acquisition device that is installed on the low-voltage side of each transformer, corresponding to each transformer, for at least acquiring the current load active power, apparent power, current, voltage, frequency and power factor of each transformer.

[0033] The fourth aspect of this invention provides a computer storage medium storing one or more computer programs, which, when executed by the power dispatching system, are used to perform the power dispatching method as provided in the first aspect of this invention.

[0034] In summary, the present invention provides an energy dispatching method, system, energy device, and storage medium that can effectively solve the problem of intelligent balanced dispatching of energy across transformer dimensions in multi-transformer scenarios under different operating modes through real-time load data acquisition. Attached Figure Description

[0035] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic flowchart of an energy dispatching method provided in an embodiment of the present invention.

[0037] Figure 2 This is a structural block diagram of an energy storage battery cabinet for an electrical energy device provided in an embodiment of the present invention.

[0038] Figure 3 This is a communication structure block diagram of an energy dispatching system provided in an embodiment of the present invention.

[0039] Figure 4 This is a structural block diagram of an electrical energy device provided in an embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0041] Unless otherwise stated, all technical and scientific terms used in the embodiments of this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0042] It should be noted that, when the terms “comprising” and “having” and any variations thereof are used, they 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 that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product or device.

[0043] Please see Figures 1 to 4 The first aspect of the present invention provides a power dispatching method, comprising:

[0044] Step S1: Identify and determine the power dispatch type of the current power dispatch mode. The power dispatch type includes a preset power dispatch type and a specified power dispatch type.

[0045] Step S2: Based on the power dispatch type determination result, control the AC-DC inverters corresponding to each transformer to perform power dispatch on the energy storage battery cabinet in the power device according to the preset dispatch strategy or the specified dispatch strategy. The specified power dispatch type has a higher control priority than the preset power dispatch type. The power dispatch includes charging, discharging and / or maintaining the current operating state of the energy storage battery cabinet. Both the preset dispatch strategy and the specified dispatch strategy include controlling the AC-DC inverters corresponding to each transformer to perform power dispatch on the energy storage battery cabinet in the power device with the transformer balance target load rate as the control target.

[0046] In step S2, the step of controlling the corresponding AC-DC inverters under each transformer to perform power dispatching on the energy storage battery cabinet in the power device based on the transformer equalization target load rate as the control target further includes: using the discharge equalization target load rate as the control target. Or use the target load rate for charging balance To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

[0047] The target load rate is equalized by discharge. To control the power dispatch of the energy storage battery cabinet in the power device by controlling the corresponding AC-DC inverters under each transformer to achieve the control target, the following further methods are included:

[0048] Based on the current active power of each transformer's load. The discharge margin power reserved for the power grid by the corresponding transformer. and the rated capacity of each transformer Calculate the initial equivalent active power of each transformer. and the current initial load rate Wherein, the initial equivalent active power The current initial load rate Where i is a natural number greater than or equal to 2, corresponding to the discharge margin power reserved by the transformer for the power grid. The settings can be made individually based on the transformer's rated capacity, load active power, time, etc., or they can be set to the same value uniformly.

[0049] Based on the current total equivalent active power of each transformer in the power supply unit Total rated capacity of all transformers and current power demand Calculate the target load factor for discharge balancing Wherein, the total equivalent active power The discharge equalization target load rate ;

[0050] Based on the current initial load rate of each transformer and the discharge equalization target load rate The energy storage battery cabinet in the power device is discharged through the corresponding AC-DC inverter under each transformer, thereby regulating the operation of each transformer within the discharge balancing target load range. The discharge balancing target load range is based on the discharge balancing target load rate. The settings are configured, in which the discharge power of each transformer is controlled by... The calculation yielded the result. The target load range for discharge balancing can be a specific point value, or it can be a range surrounding the target load rate for discharge balancing. The range of values ​​has a certain degree of fluctuation.

[0051] It should be noted that the power dispatching method provided in the first aspect of the present invention further includes: balancing the target load rate by discharging. To control the power dispatching of the energy storage battery cabinet in the power unit by the AC-DC inverters corresponding to each transformer under the control target, the initial load rate of the i-th transformer before it starts discharging is calculated based on the real-time operating data collected before each transformer starts discharging. If the initial load rate of any transformer in the power unit before it starts discharging is less than the target load rate for discharge balancing, the initial load rate of the i-th transformer before it starts discharging is considered. When the initial load rate before eliminating the non-discharge condition is less than the discharge equalization target load rate, it can be switched to the state where the initial load rate is less than the discharge equalization target load rate. The transformer participates in the discharge balancing target load rate For the purpose of regulating the target power dispatch, or to control the AC-DC inverter under the corresponding transformer to charge the energy storage battery cabinet in the power device, thereby achieving the balanced regulation of the corresponding transformer.

[0052] The power dispatching method provided in the first aspect of the present invention further includes: during the process of discharging the energy storage battery cabinet using the AC-DC inverter, based on the feedback from the transformer load acquisition device that there is a reverse current flowing from the low-voltage side of the transformer to the high-voltage side of the transformer, the AC-DC inverter is controlled to charge the energy storage battery cabinet.

[0053] The following example illustrates how an electrical device equipped with three transformers discharges into an energy storage battery cabinet:

[0054] The capacities of the three transformers are as follows: Rated capacity of transformer #1 350kVA, rated capacity of transformer #2 500kVA, rated capacity of transformer #3 630kVA.

[0055] The current active power of the transformers under load are as follows: Current active power of transformer #1 under load 100kW, Current load active power of transformer #2 180kW, Current load active power of transformer #3 200kW.

[0056] The discharge margin power reserved for the power grid by transformers #1, #2, and #3 , , All are set to 50kW.

[0057] Current power demand Discharge 200kW.

[0058] pass Calculate the initial equivalent active power of transformer #1:

[0059] 100 - 50 = 50kW

[0060] and through Calculate the current initial load rate:

[0061] (100-50) / 350≈14.29%

[0062] The initial equivalent active power of transformer #2 is calculated using the same method as that used to calculate the initial equivalent active power of transformer #1 and the current initial load rate. The current initial load rate is The initial equivalent active power of transformer #3

[0063] The current initial load rate is .

[0064] Through formula Calculate the target load factor for discharge balancing:

[0065] pass Calculate the discharge power of transformer #1: (14.29% - 8.78%) * 350 ≈ 19.29 kW.

[0066] The discharge power of transformer #2: (26% - 8.78%) * 500 ≈ 86.1 kW

[0067] The discharge power of transformer #3 is approximately 94.69 kW (23.81% - 8.78%) * 630.

[0068] After discharge, the following power distributions were achieved: Transformer #1: (50−19.29) ÷ 350 ≈ 8.78%; Transformer #2: (130−86.1) ÷ 500 ≈ 8.78%; Transformer #3: (150−94.69) ÷ 500 ≈ 8.78%. All transformers operated near the target load rate for balanced discharge. This power dispatching method, under discharge conditions, sets a safety constraint on the maximum load reduction of a single transformer, locking in the minimum power supply load floor of the grid before globally balancing the discharge power. Heavily loaded and high-load-rate transformers are given priority for more discharge power, achieving balanced load reduction across multiple transformer areas. It should be noted that the actual discharge power is also limited by the maximum discharge power allowed by the Battery Stack Management System (BAMS). The above scheme reveals its feasibility without considering the influence of power factors. In practical applications, power factors should be incorporated into the subsequent targeted settings.

[0069] The target load rate for charging balance To control the power dispatch of the energy storage battery cabinet in the power device by controlling the corresponding AC-DC inverters under each transformer to achieve the control target, the following further methods are included:

[0070] Based on the apparent power of the current load of each transformer The charging margin power configured for energy storage in each transformer. and the rated capacity of each transformer Calculate the available capacity of each transformer and the current initial load rate The available capacity of the transformer The current initial load rate , where i is a natural number greater than or equal to 2;

[0071] Based on the current total apparent power of each transformer Available capacity of each transformer and current power demand Calculate the target load rate for charging balancing Among them, the current total apparent power of each transformer Total available capacity of all transformers The target load rate for charging balancing ;

[0072] Based on the current initial load rate of the available capacity of each transformer and charging balance target load rate The energy storage battery cabinet in the power device is charged by the corresponding AC-DC inverter under each transformer, thereby scheduling and regulating the operation of each transformer within the charging balance target load range. The charging balance target load range is based on the charging balance target load rate. The settings are configured, in which the charging power of each transformer is determined by... The calculation yielded the result. It should be noted that the target load range for charging balancing can be a specific point value, or it can be a range surrounding the target load rate for charging balancing. The range of values ​​has a certain degree of fluctuation.

[0073] If the current power dispatch mode is any one of the third-party power dispatch mode, user-defined power dispatch mode, or manual power dispatch mode, then the power dispatch type is determined to be the specified power dispatch type. Then, based on the current power demand specified by the third-party power dispatch mode, user-defined power dispatch mode, or manual power dispatch mode, the AC-DC inverter under the transformer is controlled according to the discharge balancing target load rate. Or the target load rate for charging balancing To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

[0074] It should be noted that the power dispatching method provided in the first aspect of the present invention further includes: balancing the target load rate through charging. To control the power dispatching of the energy storage battery cabinet in the power unit by the AC-DC inverters corresponding to each transformer under the control target, the initial load rate of the i-th transformer before it starts charging is calculated based on the real-time operating data collected before each transformer starts charging. If the initial load rate of any transformer in the power unit before it starts charging is greater than the target load rate for charging balance, then... When the initial load rate before eliminating charging inactive conditions is greater than the target load rate for charging balancing, the system can be switched to a state where the initial load rate is greater than the target load rate for charging balancing. Transformers participate in charging to balance the target load rate. For the purpose of regulating power dispatch, or controlling the AC-DC inverter under the corresponding transformer to discharge the energy storage battery cabinet in the power device, thereby realizing the load reduction regulation of the corresponding transformer.

[0075] The initial load rate of any electrical device before charging is started is greater than the target load rate for charging balance. If the transformer is under heavy load, it indicates that the corresponding transformer was already operating under heavy load before the energy storage battery cabinet was put into charging. If the energy storage battery cabinet is continued to be charged through the AC-DC inverter on the low-voltage side of the corresponding transformer, it will further aggravate the heavy load of the corresponding transformer and even pose an overload risk, thus disrupting the load balancing effect among other transformers.

[0076] Transformers with excessive initial load rates are excluded from the charging balance of the target load rate. In order to control the power dispatch target, it is also necessary to monitor the real-time load of the removed transformer and discharge it according to the power dispatch command based on the load rate change of the removed transformer to protect the transformer from overload operation.

[0077] The following example illustrates how an electrical device equipped with three transformers charges an energy storage battery cabinet:

[0078] The rated capacities of the three transformers are as follows: The rated capacities of transformer #1 are as follows: 350kVA, rated capacity of transformer #2 500kVA, rated capacity of transformer #3 630kVA.

[0079] The apparent power of the current load of each transformer is as follows: Active power of the current load of transformer #1 100kVA, Current load active power of transformer #2 180kVA, Current load active power of transformer #3 200kVA.

[0080] Transformer #1, Transformer #2, and Transformer #3 are the charging margins configured for energy storage. , , All values ​​are set to 50kVA (different values ​​can be set in other embodiments).

[0081] Current power demand : Charging 200kW.

[0082] Through formula Calculate the available capacity of transformer #1 : ,

[0083] and through Calculate the current initial load rate : ,

[0084] The initial equivalent active power of transformer #2 was calculated using the same method as that used to calculate the available capacity of transformer #1 and the current initial load rate. Current initial load rate The initial equivalent active power of transformer #3 The current initial load rate is .

[0085] Based on the current total apparent power of each transformer Available capacity of each transformer and current power demand And through the formula Calculate the target load rate for charging balancing:

[0086]

[0087] pass Calculate the charging power of transformer #1: (51.13% - 33.33%) * 300 ≈ 53.4kW.

[0088] Charging power of transformer #2: (51.13% - 40%) * 450 ≈ 50.08 kW

[0089] Charging power of transformer #3: (51.13%—34.48%)*580≈96.57kW

[0090] After charging, the load ratios of transformers are as follows: #1: (100 + 53.4) ÷ 300 ≈ 51.13%; #2: (180 + 50.08) ÷ 450 ≈ 51.13%; #3: (200 + 96.57) ÷ 580 ≈ 51.13%. The load ratios of all transformers tend to approach 51.13%. The above power dispatching method, under charging conditions, achieves a balanced distribution of the entire network load rate by setting a fixed charging reserve margin constraint for each transformer and based on the corrected available capacity. It avoids transformer overload caused by new loads from energy storage charging, fully utilizes the idle capacity of multiple transformer areas to absorb surplus energy, and balances grid safety with local consumption. The above scheme reveals its feasibility without considering the impact of power factors. In practical application, power factors should be taken into account for targeted implementation.

[0091] If the current power dispatch mode is a peak-valley arbitrage power dispatch mode, then the current power dispatch type is determined to be the preset power dispatch type. The AC-DC inverters under each transformer are controlled to dispatch power to the energy storage battery cabinet according to the preset dispatch strategy. The preset dispatch strategy further includes identifying and determining the time period type based on current time information. If the current time belongs to a preset peak / short period or a preset valley period, the current power demand is determined based on the maximum allowable charge / discharge capacity, state of charge, and power limit of the energy storage battery cabinet, with the goal of maximizing the electricity price difference. During the preset peak / short period, the target load rate for discharge balancing is used. To control the AC-DC inverters under each transformer to preferentially discharge the energy storage battery cabinet in the power device, the charging balance target load rate is achieved during the preset valley period. To achieve the control target, the corresponding AC-DC inverters under each transformer are controlled to prioritize charging of the energy storage battery cabinet in the power device.

[0092] For example, during the preset peak / peak period, taking an electrical energy device equipped with three transformers as an example, the active power of the load of the three transformers are 200kW, 300kW, and 400kW respectively. The corresponding discharge margin power reserved by the transformers for the grid is 50kW. Then, the discharge power scheduled by the energy control system (EMS) is 150kW, 250kW, and 350kW respectively. It should be noted that the actual discharge power is also limited by the maximum discharge power allowed by the battery stack management system (BAMS).

[0093] For example, during the aforementioned off-peak period, taking a power system equipped with three transformers as an example, the apparent power of each transformer load is 100kVA, 180kVA, and 200kVA, respectively; the rated capacity of each transformer is 350kVA, 500kVA, and 630kVA, respectively; and the charging margin of each transformer for energy storage is 50kVA. Therefore, the energy control system (EMS) would schedule charging powers of 200kW, 270kW, and 380kW, respectively. It should be noted that the actual charging power is also limited by factors such as the maximum charging power allowed by the battery stack management system (BAMS).

[0094] If the current power dispatch mode is a peak-valley arbitrage power dispatch mode, it is determined to be a preset power dispatch type. The AC-DC inverters under each transformer are controlled to dispatch power to the energy storage battery cabinet according to the preset dispatch strategy. The preset dispatch strategy further includes identifying and determining the time period type based on the current time information. If the current time belongs to a preset normal period, the current power demand determined based on historical electricity consumption within a certain time period is used to balance the target load rate of the discharge. Or the target load rate for charging balancing To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

[0095] Please see Figures 2 to 4 A second aspect of the present invention provides an energy dispatching system, the system comprising:

[0096] The Battery Pack Management System (BAMS) communicates with multiple Battery Cluster Management Units (BCMUs) installed in the power equipment. It is used to uniformly schedule and control the operation of multiple energy storage battery cabinets in the site based on the cell status / operation data reported by the Battery Pack Management System (BMS). The energy storage battery cabinets are connected to the DC bus in parallel, and multiple energy storage battery cabinets in the same site constitute a battery stack. The unified scheduling and control of the operation of multiple energy storage battery cabinets in the site includes at least active voltage balancing and total input and output current protection.

[0097] An energy control system (EMS) is communicatively connected to a transformer load acquisition device, an AC-DC inverter, and a battery stack management system (BAMS). The energy control system further includes a processor for implementing one or more computer programs in the power dispatching method as described in claims 1 to 9, and a computer storage medium storing one or more computer programs. The one or more computer programs are adapted to be loaded by the processor and executed as provided in the first aspect of the present invention, i.e., for implementing power dispatching control on the AC-DC inverter connected to the transformer based on the real-time load, cell status / operation data, current time information, power equipment configuration status, and power consumption data of each transformer in the power equipment station.

[0098] Throughout the dispatching process, the Energy Management System (EMS) prioritizes the load balancing of multiple transformers by generating power dispatching commands. During off-peak hours, it prioritizes charging low-load transformers, and during peak hours, it prioritizes discharging high-load transformers. Simultaneously, it can dynamically adjust the charging and discharging power of each transformer based on actual site conditions. For example, it can discharge transformers about to become overloaded at any time to compensate for insufficient capacity; and it can charge transformers with reverse current at any time to absorb excess energy (when there are external power sources such as photovoltaics and wind power in addition to the grid). This aims to make the load of each transformer as proportionally balanced as possible, thereby improving the overall power conversion efficiency.

[0099] Please continue reading. Figures 2 to 4 The third aspect of the invention provides that the device includes the power dispatching system as provided in the second aspect of the invention, and a power routing device controlled by the power dispatching system;

[0100] The power routing device further includes;

[0101] Station-level DC busbars;

[0102] Multiple AC-DC inverters are connected in parallel to the DC busbar of the station, and their AC sides are connected to the low-voltage side of their respective transformers. They are used to DC charge multiple energy storage battery cabinets in the station or to discharge the energy storage battery cabinets to the outside.

[0103] The power supply device further includes multiple transformers and multiple energy storage battery cabinets. The low-voltage side of the transformer is electrically connected to the AC side of at least one of the AC-DC inverters, and the high-voltage side of the transformer is electrically connected to the power grid. The energy storage battery cabinets are connected in parallel to the station-level DC busbar.

[0104] The low-voltage side of the transformer in the power device provided in the third aspect of the present invention is further electrically connected to the electrical load.

[0105] The electrical power device provided in the third aspect of the present invention further includes a load acquisition device corresponding to each transformer, which is installed on the low-voltage side of each transformer for acquiring at least the current load active power, apparent power, current, voltage, frequency and power factor of each transformer.

[0106] In a specific embodiment, the transformer load acquisition device can be a smart meter with a built-in Rogowski coil or a smart meter with a built-in current transformer.

[0107] The electrical power device provided in the third aspect of the present invention further includes:

[0108] Multiple Battery Management Systems (BMS) are configured corresponding to multiple battery packs within the energy storage battery cabinet. That is, one BMS corresponds to one battery pack. In specific embodiments, the number of BMS is determined by the number of battery packs. The number of BMS corresponds to the number of battery packs in the energy storage battery cabinet. Each BMS is used to acquire the cell status / operation data of the corresponding battery pack. The cell status / operation data includes at least cell voltage, temperature, internal resistance, and state of health (SOH). It is also connected to the Battery Cluster Management Unit (BCMU) and reports the cell status / operation data to the BCMU in real time.

[0109] At least two battery cluster management systems (BCMUs) are connected to multiple battery pack management systems (BMSs) within the same energy storage battery cabinet. These systems are used to manage the overall external DC input / output and battery protection of the corresponding battery pack within the energy storage battery cabinet based on cell status / operation data reported by the BCMUs or control commands issued by the battery array management system (BAMS).

[0110] In a specific embodiment, each battery pack management system (BMS) further includes multiple slave control units (CMUs) and a battery control unit (BCU). The slave control units (CMUs) are used to collect the voltage and temperature data of individual battery cells and upload them to the battery control unit (BCU). The battery control unit (BCU) is used to integrate the voltage and temperature data of individual battery cells inside the battery pack uploaded by the slave control units (CMUs) and the battery pack voltage, current, cell internal resistance, state of health (SOH) and other cell status / operation data acquired or estimated by the battery control unit (BCU) itself, and upload the above cell status / operation data to the battery cluster management system (BCMU).

[0111] In a specific embodiment, if necessary, the power dispatch system further includes a temperature sensor for collecting cell temperature, which is electrically connected to the slave control unit (CMU) of the battery pack management system (BMS). The temperature sensor may be an NTC thermistor, a resistance temperature detector (RTD), or a fiber optic grating sensor.

[0112] A fourth aspect of the present invention provides a computer storage medium storing one or more computer programs, which, when executed by the power dispatching system, are used to perform the power dispatching method as provided in the first aspect of the present invention.

[0113] In the embodiments provided by this invention, it should be understood that the disclosed technical content can be implemented by other equivalent or alternative methods. The device embodiments described above are merely illustrative. For example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection can be through some interfaces, and the indirect coupling or communication connection of units or modules can be electrical or other forms.

[0114] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0115] The computer storage medium provided by this invention is a memory device in an energy dispatch system, used to store programs and data. It is understood that the computer storage medium here can include both the built-in storage medium of the energy dispatch method and extended storage media supported by the energy dispatch system. The computer storage medium provides storage space that stores the operating system of the energy dispatch system. Furthermore, this storage space also stores one or more computer programs suitable for loading and execution by the controller. These computer programs can be one or more computer programs (including program code), and the controller is included in the energy control system (EMS). It should be noted that the computer storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device; optionally, it can also be at least one computer storage medium located remotely from the aforementioned controller.

[0116] It should be understood that the embodiments of the power dispatching method, system, device and storage medium of the present invention are merely illustrative, and the same or similar equivalent or alternative solutions to the present invention are included within the scope of the claims of this patent.

[0117] In summary, the present invention provides an energy dispatching method, system, energy device, and storage medium that can effectively solve the problem of intelligent balanced dispatching of energy across transformer dimensions in multi-transformer scenarios under different operating modes through real-time load data acquisition.

Claims

1. A power dispatching method, characterized in that, The method includes: Identify and determine the power dispatch type of the current power dispatch mode, wherein the power dispatch type includes a preset power dispatch type and a specified power dispatch type; Based on the power dispatch type determination result, the AC-DC inverters corresponding to each transformer are controlled to perform power dispatch on the energy storage battery cabinet in the power device according to a preset dispatch strategy or a specified dispatch strategy. The specified power dispatch type has a higher control priority than the preset power dispatch type. The power dispatch includes charging, discharging and / or maintaining the current operating state of the energy storage battery cabinet. The preset scheduling strategy and the specified scheduling strategy both include controlling the corresponding AC-DC inverters under each transformer to perform power scheduling on the energy storage battery cabinet in the power device, with the transformer balance target load rate as the control target.

2. The method as described in claim 1, characterized in that, The method of controlling the corresponding AC-DC inverters under each transformer to perform power dispatching on the energy storage battery cabinet in the power device based on the transformer equalization target load rate further includes: using the discharge equalization target load rate as the control target. Or use the target load rate for charging balance To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

3. The method as described in claim 2, characterized in that, The target load rate is equalized by discharge. To control the power dispatch of the energy storage battery cabinet in the power device by controlling the corresponding AC-DC inverters under each transformer to achieve the control target, the following further methods are included: Based on the current active power of each transformer's load. The discharge margin power reserved for the power grid by the corresponding transformer. and the rated capacity of each transformer Calculate the initial equivalent active power of each transformer. and the current initial load rate Wherein, the initial equivalent active power The current initial load rate , where i is a natural number greater than or equal to 2; Based on the current total equivalent active power of each transformer in the power supply unit Total rated capacity of all transformers and current power demand Calculate the target load factor for discharge balancing Wherein, the total equivalent active power The discharge equalization target load rate , Based on the current initial load rate of each transformer and discharge balancing target load rate By using the corresponding AC-DC inverters under each transformer to perform power dispatching on the energy storage battery cabinets in the power equipment, the operation of each transformer is controlled to be within the discharge balancing target load range. The discharge balancing target load range is based on the discharge balancing target load rate. The settings are configured, in which the discharge power of each transformer is controlled by... Calculated.

4. The method as described in claim 3, characterized in that, To balance the target load rate through discharge To control the power dispatching of the energy storage battery cabinet in the power unit by the AC-DC inverters corresponding to each transformer under the control target, the initial load rate of the i-th transformer before it starts discharging is calculated based on the real-time operating data collected before the discharge condition of each transformer. If the initial load rate of any transformer in the power unit before it starts discharging is less than the discharge balance target load rate, the initial load rate of the i-th transformer before it starts discharging is considered. When this occurs, the system can selectively switch to a state where the initial load rate before eliminating non-initiated discharge conditions is less than the target load rate for discharge balancing. The transformer participates in discharging to balance the target load rate. For the purpose of regulating power dispatch, or controlling the AC-DC inverter under the corresponding transformer to charge the energy storage battery cabinet in the power device.

5. The method as described in claim 2, characterized in that, The target load rate for charging balance To control the power dispatch of the energy storage battery cabinet in the power device by controlling the corresponding AC-DC inverters under each transformer to achieve the control target, the following further methods are included: Based on the apparent power of the current load of each transformer The charging margin power configured for energy storage in each transformer. and the rated capacity of each transformer Calculate the available capacity of each transformer and the current initial load rate The available capacity of the transformer The current initial load rate , where i is a natural number greater than or equal to 2; Based on the current total apparent power of each transformer Available capacity of each transformer and current power demand Calculate the target load rate for charging balancing Among them, the current total apparent power of each transformer Total available capacity of all transformers The target load rate for charging balancing ; Based on the current initial load rate of the available capacity of each transformer and the target load rate for charging balancing By using the corresponding AC-DC inverters under each transformer to perform power dispatching on the energy storage battery cabinet in the power device, the operation of each transformer is controlled to be within the charging balance target load range. The charging balance target load range is based on the charging balance target load rate. The settings are configured, in which the charging power of each transformer is determined by... Calculated.

6. The method as described in claim 5, characterized in that, To balance the target load rate of charging To control the power dispatching of the energy storage battery cabinet in the power unit by the AC-DC inverters corresponding to each transformer under the control target, the initial load rate of the i-th transformer is calculated based on the real-time operating data collected before the charging condition of each transformer is started. If the initial load rate of any transformer in the power unit before the charging condition is started is greater than the target load rate for charging balance, then the initial load rate of the i-th transformer is considered. When the initial load rate before eliminating charging inactive conditions is greater than the target load rate for charging balancing, the system can be switched to a state where the initial load rate is greater than the target load rate for charging balancing. Transformers participate in charging to balance the target load rate. For the purpose of regulating the power dispatch of the target, or controlling the AC-DC inverter under the corresponding transformer to discharge the energy storage battery cabinet in the power device.

7. The method as described in claim 4 or 6, characterized in that, If the current power dispatch mode is any one of the third-party power dispatch mode, user-defined power dispatch mode, or manual power dispatch mode, then the power dispatch type is determined to be the specified power dispatch type. Then, based on the current power demand specified by the third-party power dispatch mode, user-defined power dispatch mode, or manual power dispatch mode, the AC-DC inverter under the transformer is controlled according to the discharge balancing target load rate. Or the target load rate for charging balancing To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

8. The method as described in claim 4 or 6, characterized in that, If the current power dispatch mode is a peak-valley arbitrage power dispatch mode, then the current power dispatch type is determined to be a preset power dispatch type, and the AC-DC inverters under each transformer are controlled to dispatch power to the energy storage battery cabinet according to the preset dispatch strategy. The preset dispatch strategy further includes identifying and determining the time period type based on the current time information. If the current time belongs to a preset peak / peak period or a preset valley period, then the current power demand is determined based on the maximum allowable charge / discharge capacity, state of charge, and power limit of the energy storage battery cabinet, with the goal of maximizing the electricity price difference. During the preset peak / peak period, the target load rate for discharge balancing is used. To control the AC-DC inverters under each transformer to preferentially discharge the energy storage battery cabinet in the power device, the charging balance target load rate is achieved during the preset valley period. To achieve the control target, the corresponding AC-DC inverters under each transformer are controlled to prioritize charging of the energy storage battery cabinet in the power device.

9. The method as described in claim 4 or 6, characterized in that, If the current power dispatch mode is a peak-valley arbitrage power dispatch mode, it is determined to be a preset power dispatch type. The AC-DC inverters under each transformer are controlled to dispatch power to the energy storage battery cabinet according to the preset dispatch strategy. The preset dispatch strategy further includes identifying and determining the time period type based on the current time information. If the current time belongs to a preset normal period, the current power demand determined based on historical electricity consumption within a certain time period is used to balance the target load rate of the discharge. Or the target load rate for charging balancing To control the target, the corresponding AC-DC inverters under each transformer are used to perform power dispatching on the energy storage battery cabinet in the power device.

10. A power dispatching system, characterized in that, The system further includes: The battery stack management system communicates with the battery cluster management system and energy management system installed in the power plant site. An energy control system is communicatively connected to a transformer load acquisition device, a battery stack management system, and an AC-DC inverter. The energy control system further includes a processor for implementing one or more computer programs in the power dispatching method as described in claims 1 to 9, and a computer storage medium storing one or more computer programs, wherein the one or more computer programs are adapted to be loaded by the processor and executed by the power dispatching method as described in any one of claims 1 to 9.

11. An electrical energy device, characterized in that, The device includes the power dispatching system as described in claim 10, and a power routing device controlled by the power dispatching system; The power routing device further includes: Station-level DC busbars; Multiple AC-DC inverters are connected in parallel on their DC sides to the station-level DC busbar, and their AC sides are connected to the low-voltage side of their respective transformers. The power supply device further includes multiple transformers and multiple energy storage battery cabinets. The low-voltage side of the transformer is electrically connected to the AC side of at least one AC-DC inverter, and the high-voltage side of the transformer is electrically connected to the power grid. The energy storage battery cabinets are connected in parallel to the station-level DC bus.

12. The apparatus as claimed in claim 11, characterized in that, The device further includes a load acquisition device that corresponds to each transformer and is installed on the low-voltage side of each transformer to acquire at least the current load active power, apparent power, current, voltage, frequency and power factor of each transformer.

13. A computer storage medium, characterized in that, It stores one or more computer programs, which, when executed by the power dispatch system, are used to perform the power dispatch method as described in any one of claims 1 to 9.

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