Power regulation method and device and energy storage equipment

Abstract

The invention discloses a power regulation method and device and energy storage equipment, which are applied to a transformer area, the transformer area comprises three phase lines A, B and C and at least one energy storage equipment, each energy storage equipment is respectively connected with the three phase lines, the energy storage equipment is used for regulating and controlling the voltage of the phase lines, and for each phase line connected with any energy storage equipment, the voltage of each phase line is regulated and controlled. The method comprises the steps of determining a voltage deviation value of a phase line based on a first voltage value and a reference voltage value of the phase line at a current sampling moment; obtaining a first output power and a power adjustment step length of the energy storage device at a previous sampling moment, wherein the power adjustment step length is a power adjustment value used when the first output power is generated at the previous sampling moment; and determining second output power of the energy storage equipment at the current sampling moment based on the power adjustment step length, the first output power and the voltage deviation value. The technical problem of how to adjust the energy storage system to stabilize the voltage of the transformer area when the voltage of the transformer area is in an unstable state is solved.

Description

Technical Field

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

[0002] A transformer substation (or transformer area) refers to the entire area in a power supply system, centered around a transformer, including residential areas or businesses that receive electricity from the transformer, and the transmission lines. The function of a transformer is to reduce high-voltage electricity to the voltage standard for residential or industrial use, and then supply electricity to surrounding residents or businesses through low-voltage lines.

[0003] If a transformer substation is used to supply electricity to residential users, peak electricity consumption periods vary depending on the time of day, night, holidays, and weekdays. During peak hours, the current in the substation's transmission lines is higher, causing a drop in voltage, with the voltage drop increasing towards the end of the line. In other words, during peak hours, the substation may experience unstable voltage due to significant load fluctuations.

[0004] Distributed energy storage systems refer to small and medium-sized energy storage systems that are installed in a decentralized manner on the user side or at distribution network nodes. Essentially, they act as "shared power banks" within a distribution area. The discharging or charging of these systems can flexibly regulate the power balance and stabilize the voltage in the distribution area. Therefore, when the voltage in a distribution area is unstable, how to regulate the voltage through distributed storage systems to achieve the technical objective of stabilizing the voltage becomes a pressing technical problem to be solved.

[0005] The above content is only used to help understand the technical solution of this application and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The main objective of this application is to provide a power regulation method, apparatus, and energy storage device, which aims to solve the technical problem of how to regulate the energy storage system to stabilize the voltage of the distribution area when the voltage of the distribution area is unstable.

[0007] To achieve the above objectives, this application provides a power regulation method applied to a transformer substation. The substation includes three phase lines A, B, and C, and at least one energy storage device. Each energy storage device is connected to one of the three phase lines. The energy storage device is used to regulate the phase line voltage. For each phase line connected to any energy storage device, the method includes: Based on the first voltage value and reference voltage value of the phase line at the current sampling time, the voltage deviation value of the phase line is determined; the first output power and power adjustment step size of the energy storage device at the previous sampling time are obtained, and the power adjustment step size is the power adjustment value used when generating the first output power at the previous sampling time; based on the power adjustment step size, the first output power and the voltage deviation value, the second output power of the energy storage device at the current sampling time is determined.

[0008] Optionally, before determining the second output power of the energy storage device at the current sampling moment based on the power adjustment step size, the first output power, and the voltage deviation value, the above method further includes: Determine whether the data update conditions for the power adjustment step size are met; if the data update conditions for the power adjustment step size are met, update the value of the power adjustment step size.

[0009] Optionally, determining whether the data update conditions for the power adjustment step size are met includes, as described above, the following: The average voltage deviation is determined based on the first average voltage value and the second average voltage value; wherein the first average voltage value is the average of the first voltage values ​​of each phase line, and the second average voltage value is the average of the second voltage values ​​of each phase line at the previous sampling time. The average power deviation is determined based on the first average power value and the second average power value; wherein the first average power value is the average of the first power of each phase line at the current sampling time, and the second average power value is the average of the second power of each phase line at the previous sampling time. The power step size deviation is determined based on the average voltage deviation, the average power deviation, and the power adjustment step size; preset average voltage limits, average power limits, and power step size limits are obtained; when the absolute value of the average voltage deviation is greater than the average voltage limit, the absolute value of the average power deviation is greater than the average power limit, and the power step size deviation is greater than the power step size limit, the data update conditions that satisfy the power adjustment step size are determined.

[0010] Optionally, updating the power adjustment step size includes: calculating the power step size using a first preset data relationship, whereby the first preset data relationship is expressed as: P NEW = P step +P diff / U diff ×P crt Among them, P NEW Indicates the power step size assignment, P step P represents the power adjustment step size. diff U represents the average power deviation. diff P represents the average voltage deviation. crt This indicates the preset power correction factor.

[0011] Update the power adjustment step size value to the power step size assignment.

[0012] Optionally, updating the power adjustment step size value to the power step size assignment includes: verifying the power step size assignment; and updating the power adjustment step size value to the power step size assignment when the verification result indicates that the power adjustment result of the power step size assignment is better than the power adjustment result of the preset power step size.

[0013] Optionally, verifying the power step size assignment includes: determining a first compensation voltage based on a first average voltage, a first average power, and a power adjustment step size; determining a second compensation voltage based on the first compensation voltage, the first average power, and the power step size assignment; if the absolute value of the difference between the second compensation voltage and the first compensation voltage is less than the absolute value of the difference between the first average voltage and the first compensation voltage, the verification result indicates that the power adjustment result of the power step size assignment is better than the power adjustment result of the preset power step size.

[0014] Optionally, determining the first compensation voltage based on the first average voltage, the first average power, and the power adjustment step size includes: calculating the first compensation voltage using a third preset data relationship, wherein the third preset data relationship is: U ref = U ave -P ave / P step Among them, U ref U represents the first compensation voltage. ave P represents the average value of the first voltage. ave P represents the first average power value. step This indicates the power adjustment step size.

[0015] Determining the second compensation voltage based on the first compensation voltage, the first average power value, and the assigned power step size includes: calculating the second compensation voltage using a fourth preset data relationship, whereby the fourth preset data relationship is: U NEW = U ref + P ave / P NEW Among them, U NEW U represents the second compensation voltage. ref P represents the first compensation voltage. NEW This indicates the assignment of the power step size.

[0016] Optionally, the second output power includes a second active output power and / or a second reactive output power.

[0017] The above-mentioned determination of the second output power of the phase line based on the power adjustment step size, the first output power, and the voltage deviation value corresponding to the phase line includes: determining the second output power based on a second preset relationship, which is expressed as follows: Pox = Px1 + Pstep × Vx - diff; where Pox represents the second active power output of phase X, Px1 represents the first active power output of phase X, Pstep represents the preset active power step size, Vx - diff represents the voltage deviation of phase X, and X represents one of phase A, phase B, or phase C.

[0018] And / or; Qox = Qx1 + Qstep × Vx - diff; where Qox represents the second reactive power output of the X phase line, Qx1 represents the first reactive power output of the X phase line, Qstep represents the preset reactive power step size, Vx - diff represents the voltage deviation of the X phase line, and X represents one of the A phase line, B phase line, or C phase line.

[0019] In addition, to achieve the above objectives, this application also provides a power regulation device, including a memory and one or more processors, wherein the memory and processors are coupled.

[0020] The memory is used to store computer program code, which includes computer instructions. When the processor executes the computer instructions, it causes the processing device to perform the methods described in the first aspect and any of its alternative methods.

[0021] In addition, to achieve the above objectives, this application also provides an energy storage device, including: an energy storage unit, a controller, and a converter unit; the controller is communicatively connected to the converter unit and the energy storage unit respectively, and the energy storage unit is connected to the AC load input terminal of the transformer area through the converter unit.

[0022] The energy storage unit is used to charge or discharge based on a given power according to the controller's instructions; the converter unit is used to rectify or invert according to the controller's instructions; and the controller is used to execute the methods in the first aspect and any of its alternatives described above.

[0023] The power regulation method provided in this application is applied to energy storage devices. By calculating the voltage deviation value of each phase line, the stable state of the line voltage can be determined based on the voltage deviation value. Furthermore, the output power at the current moment, i.e., the second output power, is calculated based on the first output power obtained at the previous sampling time, the power adjustment step size, and the voltage deviation value. It is clear that by determining the second output power at the current moment using the output power and power adjustment step size at the previous sampling time, the output power can be accumulated, thereby effectively reducing voltage errors on the line. In addition, the solution in this application is based on the second output power determined by the current phase line, which means that a single-phase control method is used for the transformer area line, and power adjustment is performed separately for the voltage of each phase line. This adjustment method can effectively control the voltage of the current phase line. Therefore, when the line voltage is unstable, the output power of the energy storage can be determined as quickly as possible to achieve line voltage stabilization. Attached Figure Description

[0024] Figure 1 A topology diagram of a distributed energy storage system provided in this application embodiment; Figure 2 A flowchart of a power regulation method provided in an embodiment of this application; Figure 3 This is a flowchart illustrating the specific implementation of updating the power regulation step size in a power regulation method provided in this application embodiment; Figure 4 This is a schematic diagram of a power regulation device module structure provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application; Figure 6 This is a schematic diagram of the hardware structure of a power regulation device provided in an embodiment of this application.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0029] Given the distribution network's setup and its limited voltage regulation capabilities, overvoltage and undervoltage issues still exist and dynamically occur on distribution lines in scenarios with rapidly increasing load demand and large seasonal load fluctuations. To optimize power quality, distributed energy storage systems can be installed in these distribution areas. Distributed energy storage can charge or discharge to regulate voltage fluctuations in the distribution area's lines.

[0030] For example, distributed energy storage can control the line voltage by gradually adjusting the output power of the energy storage system based on the difference between the set target voltage value and the actual voltage value of the line. For instance, a fixed output power can be given each time to regulate the line voltage. Another example is that preset electrical parameters can be included in the distributed energy storage system. Based on the deviation between the preset parameters and actual parameters, such as the difference between the set voltage value and the actual line voltage value, the voltage value at the distributed energy storage access point can be gradually adjusted based on the given electrical parameters (e.g., voltage value) to avoid overcharging or over-discharging of the energy storage and improve the stability of the distributed energy storage system.

[0031] It is important to note that in the examples above, the energy storage systems all use a method of setting a target voltage value (or a given voltage value) and calculating the difference between the actual voltage value and the given voltage value to regulate the line voltage. If the regulation step size (i.e., the power value that can be increased or decreased in each regulation) is too large, system regulation oscillation may occur; if the regulation step size is too small, the system regulation response may be too slow.

[0032] Based on this, embodiments of this application provide a power regulation method that can be applied to energy storage devices. When an energy storage device is installed in a transformer substation and the transmission line in the substation experiences voltage instability, the energy storage device can determine its output power based on the output power calculated at the previous sampling time, the adjustment step size, and the current voltage deviation value. In other words, the output power calculated by the energy storage device at each sampling time is not fixed, but rather an accumulation of historical output power to achieve voltage regulation.

[0033] First, we will give a brief introduction to the distributed energy storage system in the transformer area.

[0034] Please refer to Figure 1 This application provides a distributed energy storage system applied to a transformer substation topology diagram. (See the example diagram.) Figure 1 As shown, the power supply transformer is the "center" of the distribution area, and it can transmit electrical energy to loads 1 through N via transmission lines. Among them, resistors R1...R... M Resistance R M+1 ...resistance R N These are all equivalent line resistances, meaning that these resistances do not actually exist; they are only used to represent line impedance.

[0035] like Figure 1 As shown, the transformer in the distribution area supplies power to loads 1 through N, and each connection point has an impedance on the line. Therefore, when current Ig flows through each line impedance, voltage deviations may occur due to the series voltage division. It can be understood that the farther the load connection point is from the transformer, the greater the voltage deviation will be. Figure 1 As shown, distributed energy storage is set at point M to control the voltage at point M, effectively solving the voltage fluctuation problem caused by long power supply lines. For distributed energy storage, if the target voltage is higher than the actual line voltage, the distributed energy storage is in discharge mode, meaning the energy flows from the distributed energy storage to the connection point M, increasing the voltage at point M. If the target voltage is lower than the actual line voltage, the distributed energy storage is in charging mode, meaning current flows from the connection point to the distributed energy storage, decreasing the voltage at point M. When the target voltage is roughly equal to the actual voltage, the distributed energy storage operates in a steady state. In summary, distributed energy storage adjusts the target value, thereby adjusting the relationship between the target and actual values, thus controlling the charging and discharging power of the distributed energy storage and effectively controlling its operation within a reasonable range.

[0036] The power regulation method provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0037] Please refer to Figure 2This is a flowchart illustrating a power regulation method provided in an embodiment of this application. This method can be applied to a transformer substation. The substation's transmission lines include three phase lines (A, B, and C) and at least one energy storage device. Each energy storage device is connected to one of the three phase lines, and the stored energy is used to regulate the phase line voltage. The following describes the voltage stabilization methods for each phase line connected to any energy storage device. Taking the regulation of the voltage of phase line A by the energy storage device as an example, the power regulation method provided in this application embodiment is explained. In practical applications, the phase line can be phase line A, phase line B, or phase line C.

[0038] like Figure 2 As shown, the method includes steps S201-S203.

[0039] S201: Obtain the first voltage value and reference voltage value of phase A at the current moment, and determine the voltage deviation of phase A.

[0040] For example, at the current sampling time, the first voltage value of phase A is Va, and the reference voltage value is V. ref The voltage deviation can be expressed as: V ref -Va.

[0041] S202: Obtain the first output power adjustment step size of the energy storage device at the previous sampling time.

[0042] Here, the first output power is the output power calculated by the energy storage device at the previous sampling time, and the power adjustment step size is the power adjustment value used when generating the first output power at the previous sampling time. The power adjustment step size represents the voltage change step size corresponding to the power change. For example, the power adjustment step size can be set to 100W / V (watts per volt), that is, the voltage change step size is 10V for every 1000W change in power.

[0043] The energy storage system is installed in the transformer substation area and can monitor the phase line voltage in real time. For example, the sampling frequency is once per second, but it can also be once every two seconds; this application embodiment does not limit the sampling frequency.

[0044] The first output power includes active output power and / or reactive output power, and the power adjustment step size includes active power adjustment step size and / or reactive power adjustment step size.

[0045] Understandably, low-voltage power distribution networks typically use a three-phase four-wire system, meaning the transmission lines consist of three phases (A, B, and C) and a neutral line (or ground wire). This application's embodiment is based on independent control of each phase; therefore, the following is executed for each phase: S203: Determine the second output power of the energy storage device at the current sampling moment based on the power adjustment step size, the first output power, and the voltage deviation value corresponding to phase A.

[0046] The adjustment method provided in this application embodiment is single-phase control. The above steps are for adjusting the power of phase A line. Similarly, it can be applied to phase B and phase C lines. To avoid repetition, it will not be described in detail.

[0047] Understandably, executing S203 can produce three second output powers, and the energy storage device controls the power on the corresponding phase line according to the three second output powers.

[0048] It should be noted that the second output power includes active power and / or reactive power. When the phase line voltage fluctuates, the energy storage device can output active power for regulation, reactive power for regulation, or both active and reactive power for regulation. When the load in the line is resistive, outputting active power can regulate the line voltage; when the load in the line is inductive, outputting reactive power can regulate the line voltage. Therefore, in specific implementations, the second output power can be adaptively adjusted according to the line load. This application embodiment uses a resistive load and active power as the second output power to specifically illustrate the power regulation method in this scheme.

[0049] It's worth noting that in practical applications, purely resistive or inductive circuits are rare. Especially in distribution transformer systems, resistive and inductive loads coexist. Generally, energy storage systems employ one output power as the primary regulation method and the other as an auxiliary method. For example, reactive power can be set as the primary regulation method, and active power as the auxiliary method. Alternatively, active power can be set as the primary regulation method, and reactive power as the auxiliary method. When repeatedly outputting the second output power using the primary regulation method fails to stabilize the line voltage, the system will consider adding an auxiliary regulation method to jointly stabilize the line voltage. The following details the active power regulation method; similarly, when using reactive power regulation, the specific implementation details can be adjusted accordingly.

[0050] In one possible real-time method, taking phase A as an example, the energy storage obtains the first voltage value of phase A, calculates the voltage deviation of phase A, and calculates the output power of phase A based on the preset formula 1.

[0051] P oa =P a1 + P step ×(V) ref -Va) Formula 1 Among them, P oa P represents the second output power of phase A, i.e., the active power output. a1 P represents the first output power of phase A, i.e., the active power output. stepThis indicates the power adjustment step size, i.e., the active power adjustment step size.

[0052] For example, if the line is an inductive load, taking phase A as an example, the second output power can also include the reactive power Q of phase A. oa Specifically, it can be represented as: Q oa =Q a1 + Q step ×(V) ref -Va), Q oa Q represents the second output power of phase A. a1 Q represents the reactive power output of the previous sampled phase A line. step This indicates the preset reactive power adjustment step size.

[0053] It should be noted that when this data collection is the initial collection, P a1 If P is zero, then step The value is the initial preset power adjustment step size.

[0054] The power regulation step size is preset in the energy storage system. In the power regulation method provided in this application, the power regulation step size can be updated according to a preset correction coefficient so that the second output power can maintain the phase line voltage as stable as possible.

[0055] In one possible implementation, before executing S203, the power adjustment step size can be determined to see if it needs to be updated. If it is determined that the power adjustment step size needs to be updated, then the power adjustment step size is updated before executing S203. If it is determined that the power adjustment step size does not need to be updated, then S203 is executed.

[0056] For example, after step S202, the following operation is performed: if it is determined that the power adjustment step size meets the data update conditions, the value of the power adjustment step size is updated.

[0057] Please refer to Figure 3 This describes the specific implementation process for updating the power adjustment step size. For example... Figure 3 As shown, the specific methods for updating the power adjustment step size include S2-1 to S2-9.

[0058] S2-1: Determine the average voltage deviation based on the first average voltage value and the second average voltage value.

[0059] The first average voltage is calculated by the energy storage device after acquiring the first voltage value of each phase line at the current sampling time, and the second average voltage is calculated based on the second voltage of each phase line acquired by the energy storage device at the last sampling time.

[0060] For example, at time t-1, the energy storage device acquires the second voltages Ua2, Ub2, and Uc2 of each phase line and calculates their average values ​​to obtain the second average voltage U2. At time t, the energy storage device acquires the first voltages Ua1, Ub1, and Uc1 of each phase line and calculates their average values ​​to obtain the first average voltage U1. Therefore, the average voltage deviation can be expressed as: U1 - U2.

[0061] S2-2: Determine the average power deviation based on the first average power value and the second average power value.

[0062] The first average power is calculated by the energy storage device after acquiring the first power of each phase line at the current sampling time, and the second average power is calculated by the energy storage device after acquiring the second power of each phase line at the last sampling time.

[0063] For example, at time t-1, the energy storage device acquires the second power Pa2, Pb2, and Pc2 of each phase line and calculates the average to obtain the second average power P2. At time t, the energy storage device acquires the first power Pa1, Pb1, and Pc1 of each phase line and calculates the average to obtain the first average power P1. Therefore, the average power deviation can be expressed as: P1 - P2.

[0064] S2-3: Determine the power step size deviation based on the average voltage deviation, average power deviation, and power adjustment step size.

[0065] For example, the power step size deviation can be expressed by the following formula 2: PU diff =P diff / U diff -P step Formula 2 Among them, PU diff P represents the power step size deviation. step P represents the power adjustment step size. diff U represents the average power deviation, i.e., P1-P2. diff This represents the average voltage deviation, i.e., U1-U2.

[0066] S2-4: Obtain the preset average voltage limit, average power limit, and power step size limit.

[0067] S2-5: Is the absolute value of the average voltage deviation greater than the average voltage limit? If yes, proceed to S2-6; if no, proceed to S2-9.

[0068] If the absolute value of the average power deviation in S2-6 is greater than the average power limit, proceed to S2-7; otherwise, proceed to S2-9.

[0069] S2-7 Check if the power step size deviation is greater than the power step size limit. If yes, proceed to S2-8; if no, proceed to S2-9.

[0070] For example, the average voltage limit can be expressed as U diff-lim The average power limit can be expressed as P. diff-lim The power step size limit can be expressed as P. step-lim The above judgment process can be illustrated by the following judgment formula: Abs(U diff ) > U diff-lim This represents a comparison between the absolute value of the average voltage deviation and the average voltage limit. Where Abs(U diff ) indicates taking U diff The absolute value of . Abs(P) diff ) > P diff-lim This represents a comparison between the absolute value of the average power deviation and the average power limit. PU diff >PU diff-lim This indicates a comparison between the power step size deviation and the power step size limit.

[0071] S2-8: Update the power adjustment step size value.

[0072] S2-9: Do not update the power adjustment step size value.

[0073] In one possible implementation, updating the power adjustment step size includes: calculating a power step size assignment, further verifying the power step size assignment, and determining that the verification result indicates that the power adjustment result of the power step size assignment is better than the power adjustment result of the preset power step size, then updating the power adjustment step size to the power step size assignment.

[0074] For example, the power step size is calculated using the following formula 3, which is expressed as: P NEW = P step +P diff / U diff ×P crt Formula 3 Among them, P NEW Indicates the power step size assignment, P step P represents the power adjustment step size. diff U represents the average power deviation. diff P represents the average voltage deviation. crt This indicates the preset power correction factor.

[0075] Understandably, the power adjustment step size is assigned a value for verification to determine whether the updated power adjustment step size has a better effect on the voltage regulation of the phase line than the original power adjustment step size.

[0076] In one possible implementation, verifying the power step size assignment includes: determining a first compensation voltage based on a first average voltage, a first average power, and a power adjustment step size; determining a second compensation voltage based on the first compensation voltage, the first average power, and the power step size assignment; and determining that the absolute value of the difference between the second compensation voltage and the first compensation voltage is less than the absolute value of the difference between the first average voltage and the first compensation voltage, indicating that the verification result indicates that the power adjustment result of the power step size assignment is better than the power adjustment result of the preset power step size.

[0077] For example, the first compensation voltage is determined based on the first average voltage, the first average power, and the power adjustment step size. Specifically, the first compensation voltage can be calculated using the following formula 4, which can be expressed as: U ref = U1 - P1 / P step Formula 4 Among them, U ref U1 represents the first compensation voltage, P1 represents the first average voltage, and P represents the first average power. step This indicates the power adjustment step size.

[0078] The second compensation voltage is determined based on the first compensation voltage, the first average power value, and the power step size. Specifically, the second compensation voltage can be calculated using the following formula 5, which can be expressed as: U NEW = U ref + P1 / P NEW Formula 5 Among them, U NEW U represents the second compensation voltage. ref P represents the first compensation voltage. NEW This indicates the assignment of the power step size.

[0079] If Abs(U) NEW -U ref ) < Abs(U1-U ref This indicates that the power step size setting has a better effect on adjusting the phase line than the original power adjustment step size. Therefore, the power adjustment step size value can be updated to the assigned power step size value. If Abs(U NEW -U ref ) is greater than or equal to Abs(U1-U ref If the power adjustment step size is not updated, then the value of the power adjustment step size will not be updated.

[0080] It should be noted that the above update process and the steps for updating the power adjustment step size are based on a single phase line. In specific implementations, the voltage regulation of phase lines A, B, and C should all refer to the above real-time steps. In other words, the method provided in this application embodiment is for single-phase line control of the transformer area transmission line. This control method can provide more accurate power regulation based on the voltage difference of the phase line.

[0081] Furthermore, the impact of updating the output power of energy storage devices on the phase lines is that the transmission current in the phase lines will change, and consequently, the voltage value of the phase lines will also change. Although the energy storage device does not directly change the transmission current or voltage on the phase lines, it adjusts the voltage of the phase lines through power regulation, thereby achieving the technical goal of maintaining voltage stability in the phase lines.

[0082] This application also provides a power regulation device, please refer to... Figure 4 This is a schematic diagram of the module structure of the regulating device, as shown below. Figure 4 As shown, the power regulation device 400 includes: a determination module 41, an acquisition module 42, and an output module 43.

[0083] The determination module 41 is used to obtain the first voltage value and reference voltage value of each phase line in order to determine the voltage deviation value of each phase line.

[0084] The acquisition module 42 is used to acquire the first output power and power adjustment step size of each phase line.

[0085] Wherein, the first output power is the output power calculated by the energy storage device at the previous sampling time, and the power adjustment step size is the power adjustment value used when the first output power was generated at the previous sampling time.

[0086] The output module 43 is used to determine the second output power of the phase line based on the power adjustment step size, the first output power and the corresponding voltage deviation value.

[0087] In some possible implementations, the power regulation device may also include an update module and a verification module.

[0088] The update module is used to update the value of the power adjustment step size if it is determined that the power adjustment step size meets the data update conditions.

[0089] The verification module is used to verify the power step size assignment and determine whether the verification result indicates that the power adjustment result of the power step size assignment is better than the power adjustment result of the preset power step size.

[0090] Since this power regulation device is the equipment corresponding to the power regulation method described above, the specific steps that each module of the device can perform can be referred to the implementation steps in the power regulation method described above, and will not be repeated here.

[0091] It is understood that the aforementioned power regulation device includes corresponding hardware structures and / or software modules for each function in order to achieve the above functions. Those skilled in the art should readily recognize that, based on the units and implementation steps of the various examples described in conjunction with the embodiments disclosed in this application, the embodiments of this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is implemented in hardware or program-driven manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can adapt different methods to each specific application to implement the described functions, but such implementation should not be considered beyond the scope of the embodiments of this application.

[0092] This application also provides an energy storage device, please refer to... Figure 5 This is a schematic diagram of the structure of an energy storage device provided in an embodiment of this application, as shown below. Figure 5 As shown, the energy storage device 500 includes at least one energy storage unit 51, a controller 52, and a converter unit 53.

[0093] The controller 52 is communicatively connected to the converter unit 53 and the energy storage unit 51 respectively. The energy storage unit 51 is connected to the AC load input terminals A, B, and C of the transformer area through the converter unit 53.

[0094] The energy storage unit 51 is used to charge or discharge based on a given power according to the instructions of the controller 52; the converter unit 53 is used to rectify or invert according to the instructions of the controller 52; the controller 52 is used to execute the steps in the above power regulation method.

[0095] Based on the above embodiments, this application also provides a power regulation device. Figure 6 This is a schematic diagram of the physical structure of a power regulation device provided in an embodiment of this application, as shown below. Figure 6 As shown, the energy storage device 600 may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640. The processor 610, communication interface 620, and memory 630 communicate with each other via the communication bus 640. The processor 610 can call logic instructions stored in the memory 630 to execute the aforementioned power regulation method.

[0096] Furthermore, the logical instructions in the aforementioned memory 630 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0097] This application also provides a computer storage medium that includes computer instructions. When the computer instructions are executed on the processing device, the processing device can perform the method steps described in the method embodiments.

[0098] The embodiments also provide a computer program product that, when run on a processing device, enables the processing device to execute the method steps described in the above method embodiments.

[0099] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of modules or units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. In addition, the communication connections between each other proposed in this application may be through some interfaces, indirect coupling or communication connections between devices or units, which may be electrical, mechanical, or other forms.

[0100] The units described as separate components may or may not be physically separated. The three-element components may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of them may be selected according to actual needs to achieve the technical purpose of the embodiments of this application.

[0101] In addition, in the embodiments of this application, each functional unit can be integrated into one processing 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 in the form of software functional units.

[0102] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A power regulation method, characterized in that, The method is applied to a transformer substation, which includes three phase lines A, B, and C and at least one energy storage device. Each energy storage device is connected to one of the three phase lines, and the energy storage device is used to regulate the phase line voltage. For each phase line connected to any energy storage device, the method includes: Based on the first voltage value and the reference voltage value of the phase line at the current sampling time, the voltage deviation value of the phase line is determined; The first output power and power adjustment step size of the energy storage device at the previous sampling time are obtained, wherein the power adjustment step size is the power adjustment value used when the first output power was generated at the previous sampling time; Based on the power adjustment step size, the first output power, and the voltage deviation value, the second output power of the energy storage device at the current sampling time is determined.

2. The method according to claim 1, characterized in that, Before determining the second output power of the energy storage device at the current sampling moment based on the power adjustment step size, the first output power, and the voltage deviation value, the method further includes: Determine whether the data update conditions for the power adjustment step size are met; If the data update conditions for the power adjustment step size are met, the value of the power adjustment step size is updated.

3. The method according to claim 2, characterized in that, The method for determining whether the data update condition for the power adjustment step size is met includes: The average voltage deviation is determined based on the first average voltage value and the second average voltage value; wherein the first average voltage value is the average of the first voltage values ​​of each phase line, and the second average voltage value is the average of the second voltage values ​​of each phase line at the previous sampling time. The average power deviation is determined based on the first average power value and the second average power value; wherein the first average power value is the average of the first power of each phase line at the current sampling time, and the second average power value is the average of the second power of each phase line at the previous sampling time; The power step size deviation is determined based on the average voltage deviation, the average power deviation, and the power adjustment step size; Obtain preset average voltage limits, average power limits, and power step size limits; When the absolute value of the average voltage deviation is greater than the average voltage limit, the absolute value of the average power deviation is greater than the average power limit, and the power step size deviation is greater than the power step size limit, the data update condition that satisfies the power adjustment step size is determined.

4. The method according to claim 3, characterized in that, The step of updating the power adjustment step size includes: The power step size is calculated using a first preset data relationship, which is expressed as follows: P NEW = P step +P diff / U diff ×P crt ; Among them, P NEW Indicates the power step size assignment, P step P represents the power adjustment step size. diff U represents the average power deviation. diff P represents the average voltage deviation. crt This indicates the preset power correction factor; The value of the power adjustment step size is updated to the power step size assignment.

5. The method according to claim 4, characterized in that, The step of updating the power adjustment step size value to the power step size assignment includes: The power step size value is verified; When the verification result indicates that the power adjustment result of the power step size assignment is better than the power adjustment result of the preset power step size, the value of the power adjustment step size is updated to the power step size assignment.

6. The method according to claim 5, characterized in that, The verification of the power step size assignment includes: The first compensation voltage is determined based on the first average voltage, the first average power, and the power adjustment step size. The second compensation voltage is determined based on the first compensation voltage, the first average power value, and the power step size assignment. If the absolute value of the difference between the second compensation voltage and the first compensation voltage is less than the absolute value of the difference between the average value of the first voltage and the first compensation voltage, the verification result indicates that the power adjustment result assigned by the power step size is better than the power adjustment result of the preset power step size.

7. The method according to claim 6, characterized in that, Determining the first compensation voltage based on the first average voltage, the first average power, and the power adjustment step size includes: The first compensation voltage is calculated using a third preset data relationship, which is: IN ref = U ave -P ave / P step ; Among them, U ref U represents the first compensation voltage. ave P represents the average value of the first voltage. ave P represents the first average power value. step Indicates the power adjustment step size; The step of determining the second compensation voltage based on the first compensation voltage, the first average power value, and the assigned power step size includes: The second compensation voltage is calculated using a fourth preset data relationship, which is: IN NEW = U ref + P ave / P NEW ; Among them, U NEW U represents the second compensation voltage. ref P represents the first compensation voltage. NEW This indicates the assignment of the power step size.

8. The method according to any one of claims 1-7, characterized in that, The second output power includes the second active output power and / or the second reactive output power; The step of determining the second output power of the phase line based on the power adjustment step size, the first output power, and the voltage deviation value corresponding to the phase line includes: The second output power is determined based on a second preset relationship, which is expressed as follows: Pox = Px1 + Pstep × Vx - diff; Where Pox represents the second active power output of the X phase line, Px1 represents the first active power output of the X phase line, Pstep represents the preset active power step size, Vx-diff represents the voltage deviation of the X phase line, and X represents one of the A phase line, B phase line, or C phase line. and / or; Qox = Qx1 + Qstep × Vx - diff; Where Qox represents the second reactive power output of the X phase line, Qx1 represents the first reactive power output of the X phase line, Qstep represents the preset reactive power step size, Vx-diff represents the voltage deviation of the X phase line, and X represents one of the A phase line, B phase line, or C phase line.

9. A power regulation device, characterized in that, It includes a memory and one or more processors, wherein the memory and the processors are coupled; The memory is used to store computer program code, which includes computer instructions. When the processor executes the computer instructions, it causes the processing device to perform the method as described in any one of claims 1 to 8.

10. An energy storage device, characterized in that, include: Energy storage unit, controller, and converter unit; The controller is communicatively connected to the converter unit and the energy storage unit respectively, and the energy storage unit is connected to the AC load input terminal of the transformer area through the converter unit; The energy storage unit is used to charge or discharge based on a given power according to the instructions of the controller; The converter unit is used to perform rectification or inversion according to the instructions of the controller; The controller is used to perform the method as described in any one of claims 1-8.

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