Inductive area energy storage voltage control method, device and equipment and energy storage system

Abstract

The application discloses a resistive-inductive area energy storage voltage control method, device and equipment and an energy storage system, relates to the technical field of micro-grid energy storage, and is used for solving the technical problems that the prior art cannot eradicate the phase-to-phase disturbance caused by the midpoint shift and the poor control stability. The resistive-inductive area adopts a three-phase four-wire circuit, and the method comprises the following steps: performing X rounds of deviation influence derivation on any phase line according to a deviation influence formula group; wherein the deviation influence formula group is obtained based on resistive-inductive line decomposition and phase-to-phase coupling modeling; if it is determined that the Xth round of voltage correction value is not greater than a voltage threshold value, then the final power value of any phase line is obtained according to a voltage cumulative value obtained by accumulating X voltage correction values, a preset power voltage contribution degree and an initial deviation power value of a connection point of any phase line. Therefore, the application can eradicate the phase-to-phase disturbance caused by the midpoint shift and improve the control stability by means of the "deviation influence formula group, feedforward + iterative compensation" and the like.

Description

Technical Field

[0001] This application relates to the field of microgrid energy storage technology, and provides a method, device, equipment and energy storage system for voltage control of resistive-inductive transformer substation energy storage. Background Technology

[0002] Currently, due to low construction standards and insufficient investment capacity in the power distribution network, the network structure is weak and the voltage regulation capacity is insufficient. In particular, the power supply radius at the county and village levels is relatively large, making it difficult to adapt to the characteristics of rapid load demand growth, large seasonal load fluctuations, dispersed users, and widespread access to distributed energy. Therefore, overvoltage and undervoltage phenomena still exist in their power distribution lines.

[0003] Based on this, distributed energy storage has been widely proposed in the management of power supply quality in distribution substations to optimize power quality. For example, patent CN116054220A proposes a method for voltage stabilization control in distribution substations, which mainly uses power control based on the difference between the set target voltage value and the actual voltage to achieve target voltage control at the access point. Another example is patent CN116488182A, which proposes a method for presetting given electrical parameters. By utilizing the deviation between the preset parameters and the actual parameters, the target voltage at the access point is corrected, avoiding the risk of overcharging and over-discharging of the energy storage system and improving operational stability.

[0004] However, while existing technologies can achieve voltage stabilization by using a "target point voltage setting method + preset electrical parameter setting method," these technologies are based on the decoupling assumption and do not consider the effects of phase-to-phase coupling and neutral voltage drop. They ignore the decomposition of resistive-inductive lines and phase-to-phase coupling, as well as the neutral point offset caused by neutral impedance. Closed-loop feedback alone cannot offset the phase-to-phase effects in advance, and conventional optimization can only alleviate, not eliminate, these effects.

[0005] Therefore, while ensuring voltage control, how to eliminate interphase disturbances caused by midpoint offset, resolve interphase control coupling from a mechanistic perspective, and improve control stability has become an urgent problem to be solved. Summary of the Invention

[0006] This application provides a method, apparatus, equipment, and energy storage system for voltage control of resistive-inductive transformer substations, which solves the technical problems of existing technologies such as the inability to eliminate interphase disturbances caused by midpoint offset and poor control stability.

[0007] On the one hand, a method for controlling the voltage of an inductive transformer substation is provided, wherein the inductive transformer substation adopts a three-phase four-wire circuit, and the method includes: For any phase line connection point, based on the voltage deviation of the any phase line connection point, the preset power voltage contribution, and the voltage of the any phase line connection point, the initial deviation power value and the active current change value of the any phase line connection point are obtained. Based on the set of deviation influence formulas corresponding to the changes in active current of the other two phases of any one phase line, the grid voltage of any one phase line is derived through X rounds of deviation influence to obtain the voltage correction value of any one phase line in the Xth round; where X is a positive integer; the set of deviation influence formulas is obtained based on the decomposition of resistive and inductive lines and the modeling of inter-phase coupling. If it is determined that the voltage correction value of the Xth round of any phase line is not greater than the voltage threshold, then the X voltage correction values ​​obtained by the derivation of the Xth round deviation of any phase line are accumulated to obtain the voltage accumulation value of any phase line. The final power value of any phase line is obtained based on the voltage accumulation value of any phase line, the preset power voltage contribution, and the initial deviation power value of the connection point of any phase line.

[0008] Optionally, the step of obtaining the initial deviation power value and active current change value of any phase line connection point based on the voltage deviation of any phase line connection point, the preset power voltage contribution, and the voltage of any phase line connection point includes: The voltage deviation of any phase line connection point is obtained based on the real-time voltage and target voltage of any phase line connection point. Based on the voltage deviation and the preset power voltage contribution, the initial deviation power value of any phase line connection point is obtained; Based on the initial deviation power value and the voltage of any phase line connection point, the change value of the active current at any phase line connection point is obtained.

[0009] Optionally, the connection point of any phase line is the connection point of phase A line. The step of deriving the X-round deviation influence of the grid voltage of any phase line based on the deviation influence formula set corresponding to the active current change values ​​of the other two phase lines besides any phase line, and obtaining the X-round voltage correction value of any phase line, includes: Based on the set of deviation influence formulas corresponding to the changes in active current of phases B and C, determine the first deviation influence voltage value of the changes in active current of phases B on the voltage of the grid A, and the second deviation influence voltage value of the changes in active current of phases C on the voltage of the grid A. The voltage values ​​affected by the first deviation and the voltage values ​​affected by the second deviation are used to perform the first round of correction on the grid voltage of phase A line, and the first round of voltage correction value of phase A line is obtained. Determine whether the first-round voltage correction value for phase A is greater than the voltage threshold; If it is determined that the first round voltage correction value of phase A line is greater than the voltage threshold, then the first correction deviation power and the first correction current change value are obtained based on the first round voltage correction value of phase A line and the preset power voltage contribution. Based on the set of deviation influence formulas corresponding to the changes in active current of phases B and C, the second round of deviation influence derivation for the grid voltage of phase A is carried out.

[0010] Optionally, the connection point of any phase line is the connection point of phase A line. The step of obtaining the final power value of any phase line based on the voltage accumulation value of any phase line, the preset power voltage contribution rate, and the initial deviation power value of the connection point of any phase line includes: Based on the voltage accumulation value of phase A line and the preset power voltage contribution, the final power correction difference of phase A line is obtained. The final power correction difference is added to the initial deviation power value at the A-phase line connection point to obtain the final power value of the A-phase line.

[0011] Optionally, before deriving the X-round deviation influence of the grid voltage of any phase line based on the deviation influence formula set corresponding to the active current change values ​​of the other two phase lines besides any one phase line, and obtaining the X-round voltage correction value of any phase line, the method further includes: The grid voltage corresponding to each line is determined based on the active current, resistance, inductance and connection point voltage of each line; wherein, each line includes A-phase line, B-phase line, C-phase line and neutral line; The voltage at each phase node is obtained based on the grid voltage of each phase line and the grid voltage of the neutral line; For any phase node voltage, orthogonally decompose the voltage in a rotating coordinate system to obtain the resistance voltage and inductance voltage generated by the voltage in any phase node in relation to the voltages in the other two phase nodes. Based on the resistor voltage and the inductor voltage, obtain the set of deviation influence formulas corresponding to the change in active current of any phase line.

[0012] Optionally, the voltage at any phase node is the voltage at phase A node, and the step of obtaining the deviation influence formula set corresponding to the change in active current of any phase line based on the resistor voltage and the inductor voltage includes: Add the resistor voltage and inductor voltage generated by the voltage at node A relative to the voltage at node B to obtain the formula for the initial state of node B voltage. Based on the active current of phase A line under disturbance and the formula for phase B node voltage under initial state, the formula for phase B node voltage under disturbance is obtained. Based on the B-phase node voltage formula under the disturbance state and the B-phase node voltage formula under the initial state, the formula for the influence of the change in active current of the A-phase line on the deviation of the grid voltage of the B-phase line is obtained.

[0013] Optionally, the active current change value is the active current change value of phase A line, and the formula for the influence of the active current change value of phase A line on the deviation of the grid voltage of phase B line and phase C line is as follows: △Ubn_pcs_a=½×△ia×Rn+sqrt(3) / 2×△ia×wLn △Ucn_pcs_a=½×△ia×Rn-sqrt(3) / 2×△ia×wLn Wherein, △Ubn_pcs_a is the derived voltage representing the effect of the change in active current of phase A line on the deviation of grid voltage of phase B line; △Ucn_pcs_a is the derived voltage representing the effect of the change in active current of phase A line on the deviation of grid voltage of phase C line; △ia is the change in active current of phase A line; Rn is the neutral line resistance; Ln is the neutral line inductance.

[0014] On the one hand, a resistive-inductive transformer substation energy storage voltage control device is provided to implement the resistive-inductive transformer substation energy storage voltage control method described in any of the above claims, wherein the resistive-inductive transformer substation adopts a three-phase four-wire circuit, and the device includes: The initial calculation unit is used to obtain the initial deviation power value and active current change value of any phase line connection point based on the voltage deviation of the any phase line connection point, the preset power voltage contribution, and the voltage of the any phase line connection point. The deviation derivation unit is used to derive the grid voltage of any phase line in X rounds based on the deviation influence formula set corresponding to the active current change value of the other two phase lines besides any phase line, and obtain the voltage correction value of any phase line in the Xth round; wherein, X is a positive integer; the deviation influence formula set is obtained based on the decomposition of resistive and inductive lines and the modeling of inter-phase coupling; The correction accumulation unit is used to accumulate the X voltage correction values ​​obtained by the derivation of the X-round deviation effect of any phase line if it is determined that the voltage correction value of the Xth round of any phase line is not greater than the voltage threshold, so as to obtain the voltage accumulation value of any phase line. The final power acquisition unit is used to obtain the final power value of any phase line based on the voltage accumulation value of any phase line, the preset power voltage contribution degree and the initial deviation power value of the connection point of any phase line.

[0015] On the one hand, an energy storage system is provided, comprising: a control module, a power conversion module, and a battery module; wherein the control module is connected to the power conversion module and the battery module respectively, and is used to execute the resistive-inductive transformer area energy storage voltage control method described in any of the above claims.

[0016] On the one hand, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the resistive-inductive transformer area energy storage voltage control method described in any of the above claims.

[0017] On the one hand, a storage medium is provided that stores computer program instructions thereon, which, when executed by a processor, implement any of the above-mentioned resistive-inductive transformer area energy storage voltage control methods.

[0018] Compared with the prior art, the beneficial effects of this application are as follows: In this application, the resistive-inductive transformer substation adopts a three-phase four-wire circuit. Based on this, when performing energy storage voltage feedforward compensation control on the resistive-inductive transformer substation, for any phase line connection point, firstly, the initial deviation power value and active current change value of any phase line connection point can be obtained based on the voltage deviation of the any phase line connection point, the preset power voltage contribution, and the voltage of the any phase line connection point; then, based on the deviation influence formula set corresponding to the active current change values ​​of the other two phase lines besides any one phase line, the grid voltage of any phase line can be derived through X rounds of deviation influence, obtaining... The Xth round voltage correction value of any phase line is obtained; where X is a positive integer; the deviation influence formula set is obtained based on the decomposition of resistive and inductive lines and the modeling of inter-phase coupling; next, if it is determined that the Xth round voltage correction value of any phase line is not greater than the voltage threshold, the X voltage correction values ​​obtained by the derivation of the Xth round deviation influence of any phase line are accumulated to obtain the accumulated voltage value of any phase line; finally, the final power value of any phase line can be obtained according to the accumulated voltage value of any phase line, the preset power voltage contribution degree and the initial deviation power value of the connection point of any phase line.

[0019] Based on this, in this application, since the deviation influence formulas corresponding to the active current changes of the other two phases can be used to derive the grid voltage deviation influence of any phase line in X rounds, and the energy storage voltage will only be controlled when the voltage correction value of any phase line in the Xth round is not greater than the voltage threshold, compared with the prior art, this application can not only eliminate the interphase disturbance caused by the midpoint offset, but also adjust the current (or power) of the other two phases in advance when outputting the voltage correction value of one phase, and gradually converge the coupling influence to the threshold range through iterative cycles. Furthermore, since the energy storage voltage is controlled by accumulating X voltage correction values ​​derived from the X-cycle deviation of any phase line to form a voltage accumulation value (i.e., the total feedforward control quantity), and energy storage voltage is controlled based on this voltage accumulation value, compared with the prior art, this application can achieve voltage management without overshoot and with fast convergence by superimposing the voltage correction values ​​to obtain the final control quantity of feedforward compensation. This avoids overshoot and oscillation, and solves the problem of inter-phase control coupling from the mechanism while ensuring voltage management, thereby improving control stability. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an application scenario provided by an embodiment of this application; Figure 2 A schematic flowchart illustrating a resistive-inductive transformer substation voltage control method provided in an embodiment of this application; Figure 3 A simplified circuit diagram provided in this application embodiment when the line impedance is resistive-inductive; Figure 4 A dynamic response curve diagram of existing voltage control technology provided in the embodiments of this application; Figure 5 A dynamic response curve diagram of the technical solution provided in this application embodiment; Figure 6 A schematic diagram of a resistive-inductive transformer area energy storage voltage control device provided in an embodiment of this application; Figure 7 This is a schematic diagram of an energy storage system provided in an embodiment of this application.

[0022] The diagram is labeled as follows: 10-Resistive-Inductive Transmission Area Energy Storage Voltage Control Device, 101-Processor, 102-Memory, 103-I / O Interface, 104-Database, 60-Resistive-Inductive Transmission Area Energy Storage Voltage Control Device, 601-Initial Calculation Unit, 602- Deviation Derivation Unit, 603-Correction Accumulation Unit, 604-Final Power Acquisition Unit, 605-Formula Group Construction Unit, 110-Control Module, 120-Power Conversion Module, 130-Battery Module. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0024] Currently, due to low construction standards and insufficient investment capacity in the power distribution network, the network structure is weak and the voltage regulation capacity is insufficient. In particular, the power supply radius at the county and village levels is relatively large, making it difficult to adapt to the characteristics of rapid load demand growth, large seasonal load fluctuations, dispersed users, and widespread access to distributed energy. Therefore, overvoltage and undervoltage phenomena still exist in their power distribution lines.

[0025] Based on this, distributed energy storage has been widely proposed in the management of power supply quality in distribution substations to optimize power quality. For example, patent CN116054220A proposes a method for voltage stabilization control in distribution substations, which mainly uses power control based on the difference between the set target voltage value and the actual voltage to achieve target voltage control at the access point. Another example is patent CN116488182A, which proposes a method for presetting given electrical parameters. By utilizing the deviation between the preset parameters and the actual parameters, the target voltage at the access point is corrected, avoiding the risk of overcharging and over-discharging of the energy storage system and improving operational stability.

[0026] However, while existing technologies can achieve voltage stabilization by using a "target point voltage setting method + preset electrical parameter setting method," these technologies are based on the decoupling assumption and do not consider the effects of phase-to-phase coupling and neutral voltage drop. They ignore the decomposition of resistive-inductive lines and phase-to-phase coupling, as well as the neutral point offset caused by neutral impedance. Closed-loop feedback alone cannot offset the phase-to-phase effects in advance, and conventional optimization can only alleviate, not eliminate, these effects.

[0027] Based on this, this application provides a method for controlling the energy storage voltage of a resistive-inductive transformer substation. In this method, the resistive-inductive transformer substation adopts a three-phase four-wire circuit. Furthermore, when performing feedforward compensation control on the energy storage voltage of the resistive-inductive transformer substation, for any phase line connection point, firstly, the initial deviation power value and active current change value of any phase line connection point can be obtained based on the voltage deviation of that phase line connection point, the preset power voltage contribution, and the voltage of that phase line connection point. Then, based on the deviation influence formula set corresponding to the active current change values ​​of the other two phase lines besides that phase line, the power grid voltage of that phase line can be controlled. The influence of X-round deviations is derived to obtain the X-round voltage correction value for any phase line; where X is a positive integer; the deviation influence formula set is obtained based on the decomposition of resistive and inductive lines and the modeling of inter-phase coupling; next, if it is determined that the X-round voltage correction value of any phase line is not greater than the voltage threshold, the X voltage correction values ​​obtained from the X-round deviation influence derivation of any phase line are accumulated to obtain the accumulated voltage value of any phase line; finally, the final power value of any phase line can be obtained based on the accumulated voltage value of any phase line, the preset power voltage contribution, and the initial deviation power value of the connection point of any phase line.

[0028] Based on this, in this application, since the deviation influence formulas corresponding to the active current changes of the other two phases can be used to derive the grid voltage deviation influence of any phase line in X rounds, and the energy storage voltage will only be controlled when the voltage correction value of any phase line in the Xth round is not greater than the voltage threshold, compared with the prior art, this application can not only eliminate the interphase disturbance caused by the midpoint offset, but also adjust the current (or power) of the other two phases in advance when outputting the voltage correction value of one phase, and gradually converge the coupling influence to the threshold range through iterative cycles. Furthermore, since the energy storage voltage is controlled by accumulating X voltage correction values ​​derived from the X-cycle deviation of any phase line to form a voltage accumulation value (i.e., the total feedforward control quantity), and energy storage voltage is controlled based on this voltage accumulation value, compared with the prior art, this application can achieve voltage management without overshoot and with fast convergence by superimposing the voltage correction values ​​to obtain the final control quantity of feedforward compensation. This avoids overshoot and oscillation, and solves the problem of inter-phase control coupling from the mechanism while ensuring voltage management, thereby improving control stability.

[0029] After introducing the design concept of the embodiments of this application, the following is a brief introduction to the application scenarios to which the technical solutions of the embodiments of this application can be applied. It should be noted that the application scenarios described below are only for illustrating the embodiments of this application and are not intended to limit the scope. In specific implementation, the technical solutions provided by the embodiments of this application can be flexibly applied according to actual needs.

[0030] like Figure 1 The diagram shown is a schematic representation of an application scenario provided by an embodiment of this application. This application scenario may include a resistive-inductive transformer substation energy storage voltage control device 10.

[0031] The resistive-inductive transformer substation energy storage voltage control device 10 can be used to dynamically adjust the tool life, for example, it can be a personal computer (PC), server, or laptop. The resistive-inductive transformer substation energy storage voltage control device 10 may include one or more processors 101, memory 102, I / O interface 103, and database 104. Specifically, the processor 101 can be a central processing unit (CPU), or a digital processing unit, etc. The memory 102 can be volatile memory, such as random-access memory (RAM); the memory 102 can also be non-volatile memory, such as read-only memory, flash memory, hard disk drive (HDD), or solid-state drive (SSD); or the memory 102 can be any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto. The memory 102 can be a combination of the above-mentioned memories. The memory 102 can store some program instructions of the resistive-inductive transformer area energy storage voltage control method provided in the embodiments of this application. When these program instructions are executed by the processor 101, they can be used to implement the steps of the resistive-inductive transformer area energy storage voltage control method provided in the embodiments of this application, so as to solve the technical problems of the prior art, such as the inability to eliminate interphase disturbances caused by midpoint offset and poor control stability. The database 104 can be used to store data such as cutting vibration signals, polar coordinate angle value sets, vibration signal polar coordinate images, and monitoring feature value sets involved in the solutions provided in the embodiments of this application.

[0032] In this embodiment, the resistive-inductive transformer substation voltage control device 10 can obtain lifetime adjustment commands through the I / O interface 103. Then, the processor 101 of the resistive-inductive transformer substation voltage control device 10 will solve the technical problems such as phase-to-phase disturbances and poor control stability caused by midpoint offset that cannot be eliminated by the prior art, according to the program instructions of the resistive-inductive transformer substation voltage control method provided in this embodiment of the application stored in the memory 102. In addition, the initial deviation power value, active current change value, voltage correction value, voltage accumulation value and final power value of each phase line can be stored in the database 104.

[0033] Of course, the methods provided in the embodiments of this application are not limited to... Figure 1 The application scenarios shown can also be used in other possible scenarios, and this application embodiment does not impose any limitations. Figure 1 The functions that the various devices in the application scenarios shown can achieve will be described in subsequent method embodiments, and will not be elaborated on here. Below, the methods of the embodiments of this application will be described in conjunction with the accompanying drawings.

[0034] like Figure 2 The diagram shown is a flowchart illustrating a resistive-inductive transformer substation voltage control method provided in this application embodiment. This method can... Figure 1 The method is implemented using a resistive-inductive transformer area energy storage voltage control device. The specific process is described below.

[0035] Step 201: Construct a set of formulas for the deviation effects of the active current change values ​​of each phase line.

[0036] In this application, the resistive-inductive transformer area can adopt a three-phase four-wire circuit, such as... Figure 3 The diagram shown is a simplified circuit diagram of a circuit with resistive and inductive impedance provided in an embodiment of this application. The three-phase four-wire circuit includes four lines: phase A, phase B, phase C, and neutral. Generally, the actual line diameters and lengths of these four lines are the same (Ra=Rb=Rc=Rn, La=Lb=Lc=Ln).

[0037] Based on this, when constructing the set of formulas for the deviation influence of the active current change value of each phase line, firstly, the corresponding grid voltage of each line can be determined according to the active current, resistance, inductance, and connection point voltage (i.e., the connection point voltage of the energy storage system considering the line impedance). For example, for phase A line, when the active current flowing through phase A line... (Assuming the active current flowing through phase B and phase C is 0 at this time) the grid voltage corresponding to phase A is... It can be expressed using the following formula (1): = + ×(Ra+jwLa)= + ×Ra+ ×jwLa(1) in, This is the grid voltage corresponding to phase A of the line. This is the voltage at the connection point of phase A line; Let Ra be the active current corresponding to phase A; Ra be the resistance corresponding to phase A; and La be the inductance corresponding to phase A. In other words, the grid voltage corresponding to phase A is equal to the voltage at the connection point of phase A plus the voltage drop across the impedance.

[0038] Similarly, the grid voltage corresponding to the neutral line is equal to the voltage at the connection point of the neutral line plus the voltage drop across the impedance. Therefore, the grid voltage corresponding to the neutral line is... It can be expressed using the following formula (2): = + ×(Rn+jwLn)= + ×Rn+ ×jwLn (2) in, This is the grid voltage corresponding to the neutral line. The voltage at the connection point of the neutral line; Rn is the active current corresponding to the neutral line; Rn is the neutral line resistance; Ln is the neutral line inductance. Of course, in this application, the grid voltage corresponding to the B-phase line... The grid voltage corresponding to phase C line Both can be obtained by adding the voltage drop across the impedance to the voltage at the connection point.

[0039] Then, the node voltages of each phase can be obtained based on the grid voltage of each phase line and the grid voltage of the neutral line. For example, assume the active current of phase A line is... = Neutral active current It can be based on the grid voltage of phase A line. With the grid voltage of the neutral line To obtain the voltage at the A-phase line connection point as shown in formula (3) below. : = - = - (3) Similarly, the voltage at phase B node Voltage at the connection point of phase A line The following formulas (4) and (5) can be used to represent this respectively: = - (4) = - (5) Next, for any phase node voltage, orthogonal decomposition can be performed in a rotating coordinate system to obtain the resistive and inductive voltages generated by that phase node voltage in relation to the other two phase node voltages. For example, for the B-phase and C-phase node voltages of an energy storage system, orthogonal decomposition can be performed in a rotating coordinate system to obtain the active current of the A-phase line. The impact of the current flowing through the resistive section on the grid voltage of phase B and phase C, i.e., the active current of phase A. The resistive voltage generated by the grid voltage of phase B line and phase C line: Ubn_pcs=Ub_grid-Un_grid+½×ia×Rn (6) Ucn_pcs=Uc_grid-Un_grid+½×ia×Rn (7) and the active current of phase A line The effect of the current flowing through the inductor on the grid voltage of phase B and phase C, i.e., the active current of phase A. The inductive voltage generated by the grid voltage of phase B line and phase C line: Ubn_pcs=Ub_grid-Un_grid+sqrt(3) / 2×ia×wLn(8) Ucn_pcs=Uc_grid-Un_grid-sqrt(3) / 2×ia×wLn(9) Finally, by using the resistor voltage and the inductor voltage, the set of deviation influence formulas corresponding to the change in active current of any phase line can be obtained.

[0040] For example, if any phase node voltage is the phase A node voltage, then the resistance voltage and inductance voltage generated by the phase A node voltage on the phase B node voltage can be added together to obtain the initial phase B node voltage formula as shown in formula (10): Ubn_pcs=Ub_grid-Un_grid+½×ia×Rn+sqrt(3) / 2×ia×wLn(10) Then, based on the active current of phase A line under disturbance and the formula for phase B node voltage under initial state, the formula for phase B node voltage under disturbance can be obtained; that is, by substituting the active current (ia+Δia) of phase A line under disturbance into formula (10), the formula for phase B node voltage under disturbance shown in formula (11) can be obtained: Ubn_pcs=Ub_grid-Un_grid+½×(ia+△ia)×Rn+sqrt(3) / 2×(ia+△ia)×wLn(11) Next, based on the B-phase node voltage formula under the disturbance state and the B-phase node voltage formula under the initial state, the formula for the deviation effect of the active current change value of the A-phase line on the grid voltage of the B-phase line can be obtained. For example, by subtracting formula (11) from formula (10), the voltage correction value △Ubn_pcs_a of the active current change value △ia of the A-phase line on the grid voltage of the B-phase line can be obtained as shown in the following formula (12): △Ubn_pcs_a=½×△ia×Rn + sqrt(3) / 2×△ia×wLn(12) Similarly, the voltage correction value of the grid voltage of the phase C line for the active current change value Δia of the phase A line can be obtained as shown in the following formula (13): △Ucn_pcs_a=½×△ia×Rn-sqrt(3) / 2×△ia×wLn(13) Wherein, △Ubn_pcs_a is the derived voltage representing the effect of the change in active current of phase A line on the deviation of grid voltage of phase B line; △Ucn_pcs_a is the derived voltage representing the effect of the change in active current of phase A line on the deviation of grid voltage of phase C line; △ia is the change in active current of phase A line; Rn is the neutral line resistance; Ln is the neutral line inductance.

[0041] Based on this, the above formulas (12)-(13) constitute the set of deviation influence formulas corresponding to the active current change value △ia of phase A line.

[0042] In addition, similarly, we can also obtain the voltage correction value △Uan_pcs_b of the active current change value △ib of the two-phase B line to the grid voltage of the phase A, the voltage correction value △Ucn_pcs_b of the active current change value △ib of the two-phase B line to the grid voltage of the phase C line, the voltage correction value △Uan_pcs_c of the active current change value △ic of the two-phase C line to the grid voltage of the phase A line, and the voltage correction value △Ubn_pcs_c of the active current change value △ic of the two-phase C line to the grid voltage of the phase B line.

[0043] That is, we can construct the set of deviation influence formulas corresponding to the active current change value Δib of the two-phase B line as shown in formulas (14)-(15), and the set of deviation influence formulas corresponding to the active current change value Δic of the two-phase C line as shown in formulas (16)-(17): △Uan_pcs_b=½×△ib×Rn-sqrt(3) / 2×△ib×wLn(14) △Ucn_pcs_b=½×△ib×Rn+sqrt(3) / 2×△ib×wLn(15) △Uan_pcs_c=½×△ic×Rn+sqrt(3) / 2×△ic×wLn(16) △Ubn_pcs_c=½×△ic×Rn-sqrt(3) / 2×△ic×wLn(17) Step 202: For any phase line connection point, based on the voltage deviation of any phase line connection point, the preset power voltage contribution, and the voltage of any phase line connection point, obtain the initial deviation power value and active current change value of any phase line connection point.

[0044] Specifically, firstly, the voltage deviation of any phase line connection point can be obtained based on the real-time voltage and the target voltage of that connection point. For example, for phase A line connection point, the voltage deviation of phase A line connection point can be obtained by subtracting the real-time voltage from the target voltage.

[0045] Then, the initial deviation power value of any phase line connection point can be obtained based on the voltage deviation and the preset power voltage contribution. For example, for the A-phase line connection point, the initial deviation power value of the A-phase line connection point can be obtained using the following formula (18): (18) in, This represents the initial deviation power value at the connection point of phase A line; The voltage deviation at the connection point of phase A line; The preset power voltage contribution.

[0046] Next, the change in active current at any phase line connection point can be obtained based on the initial deviation power value and the voltage at any phase line connection point. For example, for phase A line connection point, the change in active current at phase A line connection point can be obtained using the following formula (19): (19) in, This represents the change in active current at the connection point of phase A line; This represents the initial deviation power value at the connection point of phase A line; This is the voltage at the connection point of phase A line.

[0047] Step 203: Based on the set of deviation influence formulas corresponding to the active current changes of the other two phases of any phase line, derive the X-round deviation influence of the grid voltage of any phase line to obtain the X-round voltage correction value of any phase line.

[0048] Wherein, X is a positive integer; the set of deviation influence formulas is obtained based on the decomposition of resistive and inductive circuits and the modeling of phase coupling.

[0049] Specifically, if any phase line connection point is phase A line connection point, that is, when feedforward compensation is required for phase A line, firstly, the first deviation influence voltage value of the active current change value of phase B line on the phase A grid voltage and the second deviation influence voltage value of the active current change value of phase C line on the phase A grid voltage can be determined according to the deviation influence formula set corresponding to the active current change value of phase B and phase C lines. That is, △Uan_pcs_b and △Uan_pcs_c can be obtained according to formula (14) and formula (16), thereby determining the influence of the active current change value of phase B and phase C on the phase A grid voltage.

[0050] Then, the voltage value affected by the first deviation, Uan_pcs_b, and the voltage value affected by the second deviation, ΔUan_pcs_c, can be used to perform the first round of correction on the grid voltage of phase A, thus obtaining the first round of voltage correction value for phase A. For example, the first round of voltage correction value ΔUan_pcs_crt1 for phase A can be obtained according to the following formula (20): △Uan_pcs_crt1=△Uan_pcs_b+△Uan_pcs_c (20) Similarly, the first-round B-phase voltage correction value △Ubn_pcs_crt1 and the first-round C-phase voltage correction value △Ucn_pcs_crt1 can also be obtained.

[0051] Next, it can be determined whether the first-round voltage correction value △Uan_pcs_crt1 of phase A is greater than the voltage threshold Uth.

[0052] Then, if the first-round voltage correction value ΔUan_pcs_crt1 of phase A is determined to be greater than the voltage threshold Uth, it indicates that the coupling effect is significant, and iterative convergence needs to continue, i.e., a second round of correction is required. Therefore, the first-round voltage correction value ΔUan_pcs_crt1 of phase A can be compared with the preset power voltage contribution. The first corrected deviation power △Pa_crt1 and the first corrected current change value △ia_crt1 are obtained. For example, for the A-phase line connection point, the following formulas (21) and (22) can be used to obtain the first corrected deviation power △Pa_crt1 and the first corrected current change value △ia_crt1: (twenty one) (twenty two) Similarly, the first corrected current change value △ib_crt1 of the first round of the B-phase node and the first corrected current change value △ic_crt1 of the first round of the C-phase node can also be obtained.

[0053] Next, based on the deviation influence formula set corresponding to the active current changes of phases B and C, the second round of deviation influence derivation for the grid voltage of phase A can be performed. That is, the first corrected current change value Δib_crt1 of the first round of phase B node and the first corrected current change value Δic_crt1 of the first round of phase C node can be substituted into formula (14) and formula (16) respectively to perform the second round of deviation influence derivation for the connection point of phase A. This process is repeated until the calculated phase A voltage correction value ΔUan_pcs_crtX of the Xth round is not greater than the voltage threshold, at which point the cycle ends.

[0054] Step 204: If it is determined that the voltage correction value of the Xth round of any phase line is not greater than the voltage threshold, then the X voltage correction values ​​obtained by the derivation of the Xth round deviation effect of any phase line are accumulated to obtain the voltage accumulation value of any phase line.

[0055] Specifically, for the A-phase line connection point, the following formula (23) can be used to obtain the voltage accumulation value △Uan_pcs_crt_final of the A-phase line: △Uan_pcs_crt_final=∑(△Uan_pcs_crtX) (23) Step 205: Based on the voltage accumulation value of any phase line, the preset power voltage contribution, and the initial deviation power value of the connection point of any phase line, obtain the final power value of any phase line.

[0056] Specifically, if any of the phase line connection points is phase A line connection point, then the voltage accumulation value ΔUan_pcs_crt_final of phase A line can be used as a reference first, along with the preset power voltage contribution. The final power correction difference for phase A is obtained by adjusting ΔUan_pcs_crt_final and... Substitute into formula (18) to obtain the final power correction difference △Pa_crt_final for phase A line.

[0057] Then, the final power correction difference ΔPa_crt_final can be compared with the initial deviation power value at the A-phase line connection point. The values ​​are added together to obtain the final power value ΔPa_final for phase A.

[0058] Similarly, the final power value △Pb_final corresponding to the B-phase node and the final power value △Pc_final corresponding to the C-phase node can also be obtained.

[0059] Specific experimental examples: like Figure 4 The figure shows a dynamic response curve of a prior art voltage control technology provided in this application embodiment. This prior art voltage control technology does not incorporate the feedforward compensation algorithm of this application. Red represents phase A, blue represents phase B, and green represents phase C. PA_run_load is the active power of phase A on the load side, VrmsA_run_pcs is the effective value of the phase A voltage on the power conditioning system (PCS) side, and PA_run_pcs is the active power of phase A on the PCS side. Similarly, simulation experiments were also conducted on phases B and C on the load side and the PCS side. It can be seen that, based on the prior art voltage control technology, the voltage fluctuates continuously around the given value, exhibiting a slowly decaying sinusoidal oscillation waveform. This causes the voltage to repeatedly exceed the target value, resulting in voltage control oscillation problems in the prior art voltage control technology. Multiple cycles of adjustment are required to stabilize the voltage control.

[0060] like Figure 5 The diagram shown is a dynamic response curve of the technical solution provided in this application embodiment. The technical solution uses a "feedforward + iterative compensation" method for voltage control. Red represents phase A, blue represents phase B, and green represents phase C. As can be seen, the technical solution calculates a compensation amount in advance based on the disturbance source (e.g., input power fluctuation) and adds it to the control command, so that the controller makes a "pre-adjustment" before the error occurs. This significantly enhances the stability of voltage control, effectively suppresses overshoot, and only requires 1 to 2 cycles of adjustment to stabilize the voltage control, avoiding oscillation and greatly improving power quality and system stability.

[0061] In summary, this application has the following advantages: (1) Since a set of formulas for the deviation of resistive and inductive transformer areas under line impedance conditions has been established, the coupling effect of the active current of each phase line on the neutral point offset and the phase voltage can be quantified.

[0062] (2) Since the phase-to-phase feedforward compensation is introduced, when the power or current of a single-phase line is output, the power or current of the other two phase lines can be calculated and corrected in advance.

[0063] (3) Since iterative cyclic convergence is adopted, the coupling effect of phase voltage can be weakened one by one until it converges to the threshold range.

[0064] (4) Since the total control quantity is formed by superimposing power and current through multiple rounds of correction, over-adjustment and oscillation can be avoided. On the basis of ensuring voltage management, the inter-phase control coupling situation can be solved from the mechanism, thereby improving control stability.

[0065] Based on the same inventive concept, this application provides a resistive-inductive transformer substation energy storage voltage control device 60, wherein the resistive-inductive transformer substation adopts a three-phase four-wire circuit, such as... Figure 6 As shown, the resistive-inductive transformer area energy storage voltage control device 60 includes: The initial calculation unit 601 is used to obtain the initial deviation power value and active current change value of any phase line connection point based on the voltage deviation of any phase line connection point, the preset power voltage contribution, and the voltage of any phase line connection point. The deviation derivation unit 602 is used to derive the grid voltage of any phase line in X rounds based on the deviation influence formula set corresponding to the active current change value of the other two phase lines besides any phase line, and obtain the voltage correction value of any phase line in the Xth round; where X is a positive integer; the deviation influence formula set is obtained based on the decomposition of resistive and inductive lines and the modeling of inter-phase coupling. The correction accumulation unit 603 is used to accumulate the X voltage correction values ​​obtained by the derivation of the X-round deviation effect of any phase line if it is determined that the X-round voltage correction value of any phase line is not greater than the voltage threshold, so as to obtain the voltage accumulation value of any phase line. The final power acquisition unit 604 is used to obtain the final power value of any phase line based on the voltage accumulation value of any phase line, the preset power voltage contribution degree and the initial deviation power value of the connection point of any phase line.

[0066] Optionally, the initial calculation unit 601 is also used for: The voltage deviation of any phase line connection point is obtained based on the real-time voltage and target voltage of any phase line connection point. The initial deviation power value of any phase line connection point is obtained based on the voltage deviation and the preset power voltage contribution. Based on the initial deviation power value and voltage of any phase line connection point, the change value of active current at any phase line connection point is obtained.

[0067] Optionally, the deviation derivation unit 602 is also used for: Based on the set of deviation influence formulas corresponding to the changes in active current of phases B and C, determine the first deviation influence voltage value of the changes in active current of phases B on the voltage of the grid A, and the second deviation influence voltage value of the changes in active current of phases C on the voltage of the grid A. The voltage values ​​affected by the first deviation and the voltage values ​​affected by the second deviation are used to perform the first round of correction on the grid voltage of phase A line, and the first round of voltage correction value of phase A line is obtained. Determine whether the first-round voltage correction value for phase A is greater than the voltage threshold; If it is determined that the first round voltage correction value of phase A line is greater than the voltage threshold, then the first correction deviation power and the first correction current change value are obtained based on the first round voltage correction value of phase A line and the preset power voltage contribution. Based on the set of deviation influence formulas corresponding to the changes in active current of phases B and C, the second round of deviation influence derivation for the grid voltage of phase A is carried out.

[0068] Optionally, the final power acquisition unit 604 is also used for: Based on the voltage accumulation value of phase A line and the preset power voltage contribution, the final power correction difference of phase A line is obtained. The final power correction difference is added to the initial deviation power value at the connection point of phase A to obtain the final power value of phase A.

[0069] Optionally, the resistive-inductive transformer area energy storage voltage control device 60 further includes a formula group construction unit 605, used for: The grid voltage corresponding to each line is determined based on the active current, resistance, inductance and connection point voltage of each line; where each line includes phase A line, phase B line, phase C line and neutral line. The voltage at each phase node is obtained based on the grid voltage of each phase line and the grid voltage of the neutral line; For any phase node voltage, orthogonally decompose the voltage of any phase node in a rotating coordinate system to obtain the resistance voltage and inductance voltage generated by the voltage of any phase node on the other two phase node voltages; Based on the resistor voltage and inductor voltage, obtain the set of formulas for the deviation effect corresponding to the change in active current of any phase line.

[0070] Optionally, formula group building unit 605 is also used for: Add the resistor voltage and inductor voltage generated by the voltage at node A relative to the voltage at node B to obtain the formula for the initial state of node B voltage. Based on the active current of phase A line under disturbance and the formula for phase B node voltage under initial condition, the formula for phase B node voltage under disturbance is obtained. Based on the formulas for the B-phase node voltage under disturbance and the initial state, the formula for the influence of the change in active current of the A-phase line on the deviation of the grid voltage of the B-phase line is obtained.

[0071] The resistive-inductive transformer area energy storage voltage control device 60 can be used to perform... Figure 2 The method performed in the illustrated embodiment is described above. Therefore, the functions that each functional module of the resistive-inductive transformer area energy storage voltage control device 60 can be referred to for the following information: Figure 2 The embodiments shown are described in detail below.

[0072] In some possible implementations, this application also provides an energy storage system, such as Figure 7 The diagram shown is a structural schematic of an energy storage system provided in an embodiment of this application. The energy storage system includes a control module 110, a power conversion module 120, and a battery module 130.

[0073] Specifically, the battery module 130 is electrically connected to the power conversion module 120, and the control module 110 is communicatively connected to both the power conversion module 120 and the battery module 130. This allows the control module 110 to monitor the battery module 130 and receive information such as battery voltage, current, and temperature. Simultaneously, the control module 110 can also determine the status of the power conversion module 120 in real time and, by determining the status of the power conversion module 120, achieve charge and discharge control management of the battery module 130.

[0074] Furthermore, the battery module 130 in the energy storage system is a device for storing electrical energy or other energy sources; the power conversion module 120 is a device for controlling the charging and discharging process of the battery module 130, and the power conversion module 120 can be a power conversion system (PCS), an alternating current to direct current (ACDC) converter, etc. The control module 110 can be the control module in the power conversion module 120, or it can be an additional control module.

[0075] It should be noted that, for example, the control module 110 in the above embodiment can communicate with the battery module 130 through a CAN (Controller Area Network) interface to obtain the status information of the battery module 130, so as to realize the protective charging and discharging of the battery module 130 and ensure the safe operation of the battery module 130.

[0076] In some possible implementations, various aspects of the methods provided in this application can also be implemented as a program product comprising program code that, when run on a computer device, causes the computer device to perform the steps of the methods according to the various exemplary embodiments of this application described above. For example, the computer device may perform actions such as... Figure 2 The method in the illustrated embodiment.

[0077] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks. Alternatively, if the integrated units of this application are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of software products. These computer software products are stored in a storage medium and include 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 methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0078] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0079] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for controlling the voltage of resistive-inductive transformer substation energy storage, characterized in that, The resistive-inductive transformer area adopts a three-phase four-wire circuit, and the method includes: For any phase line connection point, based on the voltage deviation of the any phase line connection point, the preset power voltage contribution, and the voltage of the any phase line connection point, the initial deviation power value and the active current change value of the any phase line connection point are obtained. Based on the set of deviation influence formulas corresponding to the changes in active current of the other two phases of any one phase line, the grid voltage of any one phase line is derived through X rounds of deviation influence to obtain the voltage correction value of any one phase line in the Xth round; where X is a positive integer; the set of deviation influence formulas is obtained based on the decomposition of resistive and inductive lines and the modeling of interphase coupling. If it is determined that the voltage correction value of the Xth round of any phase line is not greater than the voltage threshold, then the X voltage correction values ​​obtained by the derivation of the Xth round deviation of any phase line are accumulated to obtain the voltage accumulation value of any phase line. The final power value of any phase line is obtained based on the voltage accumulation value of any phase line, the preset power voltage contribution, and the initial deviation power value of the connection point of any phase line.

2. The method as described in claim 1, characterized in that, The step of obtaining the initial deviation power value and active current change value of any phase line connection point based on the voltage deviation of any phase line connection point, the preset power voltage contribution, and the voltage of any phase line connection point includes: The voltage deviation of any phase line connection point is obtained based on the real-time voltage and target voltage of any phase line connection point. Based on the voltage deviation and the preset power voltage contribution, the initial deviation power value of any phase line connection point is obtained; Based on the initial deviation power value and the voltage of any phase line connection point, the change value of the active current at any phase line connection point is obtained.

3. The method as described in claim 1, characterized in that, The step of deriving the X-round deviation influence of the grid voltage of any phase line, based on the deviation influence formula set corresponding to the active current change values ​​of the other two phase lines excluding any phase line, and obtaining the X-round voltage correction value of any phase line, includes: Based on the set of deviation influence formulas corresponding to the changes in active current of phases B and C, determine the first deviation influence voltage value of the changes in active current of phases B on the voltage of the grid A, and the second deviation influence voltage value of the changes in active current of phases C on the voltage of the grid A. The voltage values ​​affected by the first deviation and the voltage values ​​affected by the second deviation are used to perform the first round of correction on the grid voltage of phase A line, and the first round of voltage correction value of phase A line is obtained. Determine whether the first-round voltage correction value for phase A is greater than the voltage threshold; If it is determined that the first round voltage correction value of phase A line is greater than the voltage threshold, then the first correction deviation power and the first correction current change value are obtained based on the first round voltage correction value of phase A line and the preset power voltage contribution. Based on the set of deviation influence formulas corresponding to the changes in active current of phases B and C, the second round of deviation influence derivation for the grid voltage of phase A is carried out.

4. The method as described in claim 1, characterized in that, The step of obtaining the final power value of any phase line based on the voltage accumulation value of any phase line, the preset power voltage contribution rate, and the initial deviation power value of the connection point of any phase line, as the connection point of any phase line, includes: Based on the voltage accumulation value of phase A line and the preset power voltage contribution, the final power correction difference of phase A line is obtained. The final power correction difference is added to the initial deviation power value at the A-phase line connection point to obtain the final power value of the A-phase line.

5. The method as described in claim 1, characterized in that, Before deriving the X-round deviation influence of the grid voltage of any phase line based on the deviation influence formula set corresponding to the active current changes of the other two phase lines (excluding any phase line), and obtaining the X-round voltage correction value of any phase line, the method further includes: The grid voltage corresponding to each line is determined based on the active current, resistance, inductance and connection point voltage of each line; wherein, each line includes A-phase line, B-phase line, C-phase line and neutral line; The voltage at each phase node is obtained based on the grid voltage of each phase line and the grid voltage of the neutral line; For any phase node voltage, orthogonally decompose the voltage in a rotating coordinate system to obtain the resistance voltage and inductance voltage generated by the voltage in any phase node in relation to the voltages in the other two phase nodes. Based on the resistor voltage and the inductor voltage, obtain the set of deviation influence formulas corresponding to the change in active current of any phase line.

6. The method as described in claim 5, characterized in that, The step of obtaining the deviation influence formula set corresponding to the active current change value of any phase line based on the resistor voltage and the inductor voltage, wherein the voltage of any phase node is the voltage of phase A node, includes: Add the resistor voltage and inductor voltage generated by the voltage at node A relative to the voltage at node B to obtain the formula for the initial state of node B voltage. Based on the active current of phase A line under disturbance and the formula for phase B node voltage under initial state, the formula for phase B node voltage under disturbance is obtained. Based on the B-phase node voltage formula under the disturbance state and the B-phase node voltage formula under the initial state, the formula for the influence of the change in active current of the A-phase line on the deviation of the grid voltage of the B-phase line is obtained.

7. The method as described in claim 1, characterized in that, The active current change value is the active current change value of phase A line. The formula for the influence of the active current change value of phase A line on the deviation of the grid voltage of phase B line and phase C line is as follows: △Ubn_pcs_a=½×△ia×Rn+sqrt(3) / 2×△ia×wLn △Ucn_pcs_a=½×△ia×Rn-sqrt(3) / 2×△ia×wLn Wherein, △Ubn_pcs_a is the derived voltage representing the effect of the change in active current of phase A line on the deviation of grid voltage of phase B line; △Ucn_pcs_a is the derived voltage representing the effect of the change in active current of phase A line on the deviation of grid voltage of phase C line; △ia is the change in active current of phase A line; Rn is the neutral line resistance; Ln is the neutral line inductance.

8. A resistive-inductive transformer substation voltage control device, characterized in that, For implementing the method as described in claim 1, wherein the resistive-inductive transformer area employs a three-phase four-wire circuit, the device comprises: The initial calculation unit is used to obtain the initial deviation power value and active current change value of any phase line connection point based on the voltage deviation of the any phase line connection point, the preset power voltage contribution, and the voltage of the any phase line connection point. The deviation derivation unit is used to derive the grid voltage of any phase line in X rounds based on the deviation influence formula set corresponding to the active current change value of the other two phase lines besides any phase line, and obtain the voltage correction value of any phase line in the Xth round; wherein, X is a positive integer; the deviation influence formula set is obtained based on the decomposition of resistive and inductive lines and the modeling of inter-phase coupling; The correction accumulation unit is used to accumulate the X voltage correction values ​​obtained by the derivation of the X-round deviation effect of any phase line if it is determined that the voltage correction value of the Xth round of any phase line is not greater than the voltage threshold, so as to obtain the voltage accumulation value of any phase line. The final power acquisition unit is used to obtain the final power value of any phase line based on the voltage accumulation value of any phase line, the preset power voltage contribution degree and the initial deviation power value of the connection point of any phase line.

9. An electronic device, characterized in that, The device includes: Memory, used to store program instructions; A processor is configured to invoke program instructions stored in the memory and execute the method described in any one of claims 1-7 according to the obtained program instructions.

10. An energy storage system, characterized in that, include: The system comprises a control module, a power conversion module, and a battery module; wherein the control module is connected to the power conversion module and the battery module respectively, and is used to execute the resistive-inductive transformer area energy storage voltage control method as described in any one of claims 1-7.

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