Voltage regulation method, apparatus, computer device, storage medium and program product

Abstract

The application relates to a voltage regulation method and device, computer equipment, a storage medium and a program product. The method comprises the following steps: acquiring electrical data of a power distribution network under at least one phase; the power distribution network, a target load and a voltage regulation device are connected in series; the voltage regulation device is used for regulating the voltage of the target load; the power distribution network comprises a three-phase alternating current source and an impedance load; the three-phase alternating current source is connected in series with the impedance load; for each phase, according to the electrical data under the phase, the voltage regulation parameter under the phase is determined; according to the voltage regulation parameter, the pulse width modulation signal under the phase is determined; according to the pulse width modulation signals under the phases, the voltage regulation device is controlled to regulate the voltage of the target load; in the above process, for each phase, based on the voltage regulation parameter, the pulse width modulation signal under the phase can be determined, so that independent regulation and control of three phases can be realized, and more accurate regulation and control can be realized for the problem of three-phase imbalance.

Description

Technical Field

[0001] This application relates to the field of power control technology, and in particular to a voltage regulation method, apparatus, computer equipment, storage medium, and program product. Background Technology

[0002] With the increasing penetration of distributed power sources, electric vehicles, and other loads at the end of distribution networks, the operating conditions of these networks exhibit significant randomness, volatility, and imbalance. The connection of these loads not only causes frequent deviations of the voltage at the end nodes of the distribution network from the rated range but also easily leads to three-phase voltage imbalance problems.

[0003] In related voltage regulation technologies, traditional on-load tap-changing transformers, static synchronous compensators, and three-arm series voltage regulators are used to regulate the voltage of the distribution network. These voltage regulation technologies typically have low voltage regulation accuracy at the end of the distribution network, cannot meet the regulation needs of each phase voltage, and are ineffective under three-phase voltage imbalance conditions.

[0004] Therefore, how to achieve precise control over load voltage fluctuations and three-phase imbalance at the end of the distribution network is an urgent problem to be solved. Summary of the Invention

[0005] Therefore, it is necessary to provide a voltage regulation method, device, computer equipment, storage medium, and program product that can accurately control voltage fluctuations and three-phase imbalances at the end of the distribution network to address the aforementioned technical problems.

[0006] In a first aspect, this application provides a voltage regulation method, comprising:

[0007] Acquire electrical data of the distribution network in at least one phase; the distribution network, target load, and voltage regulating equipment are connected in series in sequence; the voltage regulating equipment is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series.

[0008] For each phase, the voltage regulation parameters for that phase are determined based on the electrical data for that phase.

[0009] Determine the pulse width modulation signal under the phase based on the voltage adjustment parameters;

[0010] The voltage regulating device is controlled according to the pulse width modulation signal under each phase to regulate the voltage of the target load.

[0011] In one embodiment, the electrical data includes the first output voltage amplitude and the first output voltage phase of the three-phase AC source, and the impedance data of the impedance load. Based on the electrical data under the phase, the voltage regulation parameters under the phase are determined, including: determining the second output voltage amplitude and line current data of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, and the impedance data of the impedance load; determining the first active power injected by the three-phase AC source into the distribution network based on the first output voltage amplitude, the first output voltage phase, and the line current data; and determining the second active power consumed by the impedance load based on the first output voltage amplitude, the second output voltage amplitude, and the line current data; and determining the voltage regulation parameters under the phase based on the first active power, the second active power, the second output voltage amplitude, and the line current data.

[0012] In one embodiment, determining the second output voltage amplitude and line current data of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, and the impedance data of the impedance load includes: acquiring the line voltage drop phase and the voltage phase of the impedance load in the distribution network; determining the line current data of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, the line voltage drop phase, and the voltage phase of the impedance load; and determining the second output voltage amplitude of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, and the line current data.

[0013] In one embodiment, determining the first active power injected into the distribution network by the three-phase AC source based on the first output voltage amplitude, the first output voltage phase, and line current data includes: determining the first initial power injected into the distribution network by the three-phase AC source based on the product of the first output voltage amplitude, the first output voltage phase, and line current data; and taking the real part of the first initial power as the first active power.

[0014] In one embodiment, determining the second active power consumed by the impedance load based on the first output voltage amplitude, the second output voltage amplitude, and line current data includes: determining the product difference based on the product of the first output voltage amplitude and the first output voltage phase, and the product of the second output voltage amplitude and the second output voltage phase; determining the second initial power consumed by the impedance load based on the product of the product difference and the line current data; and taking the real part of the second initial power as the second active power.

[0015] In one embodiment, determining the voltage regulation parameters under a phase based on the first active power, the second active power, the second output voltage amplitude, and line current data includes: determining the third active power transmitted by the voltage regulating device based on the difference between the first active power and the second active power; determining the fourth active power transmitted by the voltage regulating device based on the product of the second output voltage amplitude and the line current data; and determining the voltage regulation parameters under a phase based on the third active power and the fourth active power.

[0016] Secondly, this application also provides a voltage regulating device, comprising:

[0017] The acquisition module is used to acquire electrical data of the distribution network in at least one phase; the distribution network, target load, and voltage regulating equipment are connected in series in sequence; the voltage regulating equipment is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series.

[0018] The first determining module is used to determine the voltage regulation parameters for each phase based on the electrical data of that phase.

[0019] The second determining module is used to determine the pulse width modulation signal under the phase based on the voltage adjustment parameters;

[0020] The control module is used to control the voltage regulating device according to the pulse width modulation signal in each phase, so as to regulate the voltage of the target load.

[0021] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0022] Acquire electrical data of the distribution network in at least one phase; the distribution network, target load, and voltage regulating equipment are connected in series in sequence; the voltage regulating equipment is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series.

[0023] For each phase, the voltage regulation parameters for that phase are determined based on the electrical data for that phase.

[0024] Determine the pulse width modulation signal under the phase based on the voltage adjustment parameters;

[0025] The voltage regulating device is controlled according to the pulse width modulation signal under each phase to regulate the voltage of the target load.

[0026] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the following steps:

[0027] Acquire electrical data of the distribution network in at least one phase; the distribution network, target load, and voltage regulating equipment are connected in series in sequence; the voltage regulating equipment is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series.

[0028] For each phase, the voltage regulation parameters for that phase are determined based on the electrical data for that phase.

[0029] Determine the pulse width modulation signal under the phase based on the voltage adjustment parameters;

[0030] The voltage regulating device is controlled according to the pulse width modulation signal under each phase to regulate the voltage of the target load.

[0031] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, performs the following steps:

[0032] Acquire electrical data of the distribution network in at least one phase; the distribution network, target load, and voltage regulating equipment are connected in series in sequence; the voltage regulating equipment is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series.

[0033] For each phase, the voltage regulation parameters for that phase are determined based on the electrical data for that phase.

[0034] Determine the pulse width modulation signal under the phase based on the voltage adjustment parameters;

[0035] The voltage regulating device is controlled according to the pulse width modulation signal under each phase to regulate the voltage of the target load.

[0036] The aforementioned voltage regulation method, apparatus, computer equipment, storage medium, and program product acquire electrical data of the distribution network in at least one phase; the distribution network, target load, and voltage regulating equipment are connected in series sequentially; the voltage regulating equipment is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series; for each phase, voltage regulation parameters are determined based on the electrical data of that phase; the pulse width modulation signal for that phase is determined based on the voltage regulation parameters; the voltage regulating equipment is controlled based on the pulse width modulation signals for each phase to regulate the voltage of the target load; in the above process, for each phase, the pulse width modulation signal for that phase can be determined based on the voltage regulation parameters, thereby enabling independent control of the three phases and achieving more precise control over three-phase imbalance. Attached Figure Description

[0037] 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 of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart illustrating a voltage regulation method in one embodiment;

[0039] Figure 2 This is a schematic diagram of a power distribution network topology in one embodiment;

[0040] Figure 3 This is a schematic diagram of the circuit equivalent model of the voltage regulating device, taking phase a as an example in one embodiment;

[0041] Figure 4 This is a schematic diagram of a vector model in one embodiment;

[0042] Figure 5 This is a flowchart illustrating the voltage regulation method in another embodiment;

[0043] Figure 6 This is a schematic diagram illustrating the process of determining the pulse width modulation signal in one embodiment;

[0044] Figure 7 This is a schematic diagram comparing the start and end voltages of a three-phase distribution network in one embodiment;

[0045] Figure 8 This is a schematic diagram of the voltage waveform after adjustment by the voltage regulating device in one embodiment;

[0046] Figure 9 This is a schematic diagram of the line voltage drop waveform in one embodiment;

[0047] Figure 10 This is a schematic diagram of the line current waveform in one embodiment;

[0048] Figure 11 This is a structural block diagram of a voltage regulation device in one embodiment;

[0049] Figure 12 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0051] In one exemplary embodiment, such as Figure 1 As shown, a voltage regulation method is provided, including the following steps:

[0052] S110, acquire electrical data of the distribution network in at least one phase; the distribution network, target load and voltage regulating equipment are connected in series in sequence; the voltage regulating equipment is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series.

[0053] In this system, a three-phase AC source can constitute the beginning of a distribution network, and an impedance load can constitute the end of the distribution network. An impedance load can include at least one of a resistor and an inductor.

[0054] The target load can be understood as a load connected to the distribution network and powered by the distribution network. For example, the target load can be a distributed power source, an electric vehicle, etc.

[0055] Optionally, the voltage regulating device can be a three-phase H-bridge inverter. Alternatively, the voltage regulating device can be a three-phase four-arm inverter.

[0056] Figure 2 A schematic diagram of a distribution network topology is shown, where DN1 represents a three-phase AC source in the distribution network. x Represents the line resistance at any phase, where x can be a, b, or c, R a R represents the resistance of phase a of the line. b R represents the resistance of phase b of the line. c This represents the resistance of phase c of the circuit. L x The line inductance represents any phase, where x can be a, b, or c, L. a L represents the line inductance of phase a. b L represents the inductance of phase b. c This represents the inductance of phase c. 12,x This indicates the feeder current. u sx This indicates the three-phase output voltage value of the voltage regulating device. L f This represents the filter inductance. C f This represents the filter capacitor. U dc This is the actual value of the DC voltage.

[0057] Taking phase a as an example, the circuit equivalent model of the voltage regulating device is as follows: Figure 3 As shown, where U ga and φ ga These represent the effective value and phase of the output voltage on phase a, respectively; i 12,a Z represents the current in phase a of the line; a Represents the set of line impedances for phase a; U Za φ represents the effective value of the voltage drop in phase a of the line; ZaThis represents the phase of the voltage drop in phase a of the line; the voltage regulating device is equivalent to a controlled voltage source u. sa U sa It is the actual effective value of its output voltage, φ sa It is the actual output voltage phase; Z La Indicates the load of phase a line; U La φ represents the effective value of the load voltage of phase a line; La This indicates the phase of the load voltage on phase a.

[0058] The electrical data may include at least one of the following: the amplitude of the first output voltage of the three-phase AC source, the phase of the first output voltage, the impedance data of the impedance load, the amplitude of the impedance load voltage, and the phase of the impedance load voltage. The amplitude of the first output voltage can be understood as the effective value of the output voltage of the three-phase AC source. When the impedance load includes line resistance, the impedance data may include the resistance value of the line resistance. When the impedance load includes line inductance, the impedance data may include the inductance value of the line inductance. When the impedance load includes both line resistance and line inductance, the impedance data may include a set of resistance and inductance values. In some embodiments, the impedance data may be obtained according to the following formula: ,in, This represents impedance data, that is, the set of resistance and inductance values. Lx represents the resistance value, Lx represents the inductance value, and j represents the imaginary unit. This represents the angular frequency of the power grid.

[0059] In some embodiments, electrical data can be acquired by means of measuring instruments. For example, the first voltage vector of a three-phase AC source can be acquired using a voltmeter or oscilloscope. The resistance value of a line can be acquired using a resistance meter. The inductance value of a line can be acquired using an inductance meter.

[0060] S120 determines the voltage regulation parameters for each phase based on the electrical data for that phase.

[0061] Among them, voltage regulation parameters can be understood as parameters used to regulate the voltage of the target load.

[0062] In some embodiments, the second output voltage amplitude and line current data of the voltage regulating device can be determined based on the first output voltage amplitude, the first output voltage phase, and the impedance data of the impedance load. The first active power injected into the distribution network by the three-phase AC source is determined based on the first output voltage amplitude, the first output voltage phase, and the line current data; and the second active power consumed by the impedance load is determined based on the first output voltage amplitude, the second output voltage amplitude, and the line current data; and the voltage regulation parameters under the phase are determined based on the first active power, the second active power, the second output voltage amplitude, and the line current data.

[0063] The impedance data for the impedance load can include the resistance value of the line resistance and the inductance value of the line inductance.

[0064] In some embodiments, during the process of determining the second output voltage amplitude and line current data of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, and the impedance data of the impedance load, the line voltage drop phase and the voltage phase of the impedance load in the distribution network can be obtained; the line current data of the voltage regulating device can be determined based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, the line voltage drop phase, and the voltage phase of the impedance load; and the second output voltage amplitude of the voltage regulating device can be determined based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, and the line current data.

[0065] The line voltage drop phase can be understood as the phase of voltage drop after passing through an impedance load.

[0066] In an alternative embodiment, the line voltage drop phase can be denoted as φ. Zx The voltage phase of the impedance load is denoted as φ. Lx The amplitude of the first output voltage is denoted as U. gx The phase of the first output voltage is denoted as φ. gx The impedance data of the impedance load is denoted as Z. x The line current data is denoted as i. 12,x , where i 12,x Let U be the line current vector of phase x, and let U be the amplitude of the second output voltage. sx .

[0067] based on Figure 4 The vector model diagram shown can be used to obtain the transmission power of voltage regulating equipment in the power distribution network. Figure 4 In the middle, with u gx Represents the x-phase AC source voltage vector, with u gx Establish a coordinate system for the real axis; φ 12,x This represents the phase difference between the x-phase AC source and the load voltage; u Zx This represents the voltage drop caused by the impedance of phase x; u sx Represents the x-phase output voltage vector of the voltage regulating device; i 12,x φ represents the line current vector of phase x; Ix Indicates the phase of the line current.

[0068] The line current data and the second output voltage amplitude of the voltage regulating device can be calculated using the following formula:

[0069]

[0070]

[0071] Based on the line current data and the second output voltage amplitude of the voltage regulating device, the transmission power of the voltage regulating device in each phase can be obtained.

[0072] In some embodiments, during the process of determining the first active power injected into the distribution network by the three-phase AC source based on the first output voltage amplitude, the first output voltage phase, and the line current data, the first initial power injected into the distribution network by the three-phase AC source can be determined based on the product of the first output voltage amplitude, the first output voltage phase, and the line current data; and the real part of the first initial power is taken as the first active power.

[0073] In an alternative embodiment, the first active power can be denoted as P. ugx .

[0074] The first active power injected into the distribution network by a three-phase AC source can be calculated using the following formula:

[0075]

[0076] In some embodiments, when determining the second active power consumed by the impedance load based on the first output voltage amplitude, the second output voltage amplitude, and the line current data, the product difference can be determined based on the product of the first output voltage amplitude and the first output voltage phase, and the product of the second output voltage amplitude and the second output voltage phase; the second initial power consumed by the impedance load can be determined based on the product of the product difference and the line current data; and the real part of the second initial power can be taken as the second active power.

[0077] In an alternative embodiment, the second active power can be denoted as P. Zx The phase of the second output voltage is denoted as .

[0078] The second active power consumed by the impedance load can be calculated using the following formula:

[0079]

[0080] In some embodiments, during the process of determining the voltage regulation parameters under a phase based on the first active power, the second active power, the second output voltage amplitude, and the line current data, the third active power transmitted by the voltage regulating device can be determined based on the difference between the first active power and the second active power; the fourth active power transmitted by the voltage regulating device can be determined based on the product of the second output voltage amplitude and the line current data; and the voltage regulation parameters under a phase can be determined based on the third active power and the fourth active power.

[0081] In an alternative embodiment, the third active power can be denoted as P. tThe fourth active power is denoted as P' t , P' t =U sx i 12,x The voltage regulation parameter is denoted as u. s * .

[0082] Let P t =P' t The voltage regulation parameters can be calculated using the following formula:

[0083]

[0084] in, To adjust the effective value of the voltage; To adjust the voltage phase; U Lx φ is the amplitude of the impedance load voltage. Lx This represents the phase of the impedance load voltage. It can be understood that the voltage regulation parameters can be determined based on the effective value and phase of the regulating voltage.

[0085] S130 determines the pulse width modulation signal under the phase according to the voltage adjustment parameters.

[0086] Among them, pulse width modulation signal can be understood as a signal used to control voltage regulation equipment.

[0087] In some embodiments, for each phase, the voltage regulation parameter can be processed by proportional-integral feedback control using the amplitude of the second output voltage at that phase to obtain the current feedback quantity; the current feedback quantity is then processed by proportional feedback control using the current data of the filter capacitor corresponding to the voltage regulation device to obtain the modulated voltage signal at that phase. Specifically, the difference between the amplitude of the second output voltage and the voltage regulation parameter can be processed by proportional-integral feedback to obtain the current feedback quantity. The difference between the current feedback quantity and the filter capacitor current data is then processed by proportional feedback control to obtain the modulated voltage signal.

[0088] Then, the voltage amplitude of the modulated voltage signal is compared with the voltage amplitude of the triangular wave to obtain a comparison result. If the comparison result indicates that the voltage amplitude of the modulated voltage signal is greater than the voltage amplitude of the triangular wave, the pulse width modulation signal at the corresponding phase is determined as the first modulation signal; if the comparison result indicates that the voltage amplitude of the modulated voltage signal is not greater than the voltage amplitude of the triangular wave, the pulse width modulation signal at the corresponding phase is determined as the second modulation signal. The first modulation signal is used to control the voltage regulating device to transmit electrical energy; the second modulation signal is used to control the voltage regulating device to stop transmitting electrical energy.

[0089] In one optional embodiment, if the voltage amplitude of the modulated voltage signal is greater than the voltage amplitude of the triangular wave, the pulse width modulation signal at the corresponding phase is determined to be a low-level signal, i.e., output 0. If the voltage amplitude of the modulated voltage signal is not greater than the voltage amplitude of the triangular wave, the pulse width modulation signal at the corresponding phase is determined to be a high-level signal, i.e., output 1.

[0090] S140 controls the voltage regulating device according to the pulse width modulation signal under each phase to regulate the voltage of the target load.

[0091] For each phase, when the pulse width modulation signal in that phase is the first modulation signal, the switching transistor in the voltage regulating device can be turned on to allow current to flow, thereby achieving power transmission and increasing the voltage of the target load. When the pulse width modulation signal in that phase is the second modulation signal, the switching transistor in the voltage regulating device can be turned off to block the current, thereby stopping power transmission and stopping the voltage increase of the target load.

[0092] In the above voltage regulation method, electrical data of the distribution network at at least one phase can be obtained; the distribution network, target load, and voltage regulating equipment are connected in series in sequence; the voltage regulating equipment is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series; for each phase, the voltage regulation parameters for that phase are determined based on the electrical data of that phase; the pulse width modulation signal for that phase is determined based on the voltage regulation parameters; the voltage regulating equipment is controlled based on the pulse width modulation signals for each phase to regulate the voltage of the target load; in the above process, for each phase, the pulse width modulation signal for that phase can be determined based on the voltage regulation parameters, thereby enabling independent control of the three phases and achieving more precise control over the problem of three-phase imbalance.

[0093] Based on the technical solutions of the above embodiments, this application also provides another optional embodiment, in which the voltage regulation method is described in detail.

[0094] See Figure 5 The voltage regulation method shown includes:

[0095] S501, acquires three-phase electrical data of the power distribution network.

[0096] Among them, the three-phase electrical data includes the first output voltage amplitude U of the three-phase AC source. gx First output voltage phase φ gx Impedance load voltage amplitude U Lx Impedance load voltage phase φ Lx Impedance data of the load (including three-phase line resistance R) xand three-phase line inductance L x ).

[0097] S502 obtains the phase of line voltage drop and the phase of voltage of impedance load in the distribution network.

[0098] Wherein, the phase of the line voltage drop is φ Zx The voltage phase of the impedance load is φ Lx .

[0099] When the voltage difference between the beginning and end of the distribution network (the voltage difference between the three-phase AC source and the end of the impedance load) is detected to be greater than the voltage threshold, the voltage regulating equipment is put into operation, and the series voltage vector control parameters of the equipment are calculated at the same time.

[0100] S503, for each phase, determines the line current data of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, the line voltage drop phase, and the voltage phase of the impedance load.

[0101] S504, based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, and the line current data, determine the second output voltage amplitude of the voltage regulating device.

[0102] S505 determines the first initial power injected into the distribution network by the three-phase AC source based on the product of the first output voltage amplitude, the first output voltage phase, and the line current data.

[0103] S506, the real part of the first initial power is taken as the first active power.

[0104] S507, determine the product difference based on the product of the first output voltage amplitude and the first output voltage phase, and the product of the second output voltage amplitude and the second output voltage phase.

[0105] S508 determines the second initial power consumed by the impedance load based on the product of the product difference and the line current data.

[0106] S509 takes the real part of the second initial power as the second active power.

[0107] S510, based on the difference between the first active power and the second active power, determines the third active power transmitted by the voltage regulating device.

[0108] S511 determines the fourth active power transmitted by the voltage regulating device based on the product of the second output voltage amplitude and the line current data.

[0109] S512 determines the voltage regulation parameters under phase based on the third active power and the fourth active power.

[0110] S513 determines the pulse width modulation signal under the phase based on the voltage regulation parameters.

[0111] In specific implementation, such as Figure 6 As shown, the voltage regulation parameters are controlled by the outer voltage loop and the inner current loop to make the second output voltage of the voltage regulator fit the voltage regulation parameters, and the pulse width modulation signal of the voltage regulator is obtained by modulation.

[0112] Voltage loop: First, the voltage regulation parameters are proportional-integral feedback control is performed based on the second output voltage of the voltage regulator to obtain the current feedback quantity.

[0113] Current loop: The current feedback quantity is proportionally fed back based on the filter capacitor current to obtain the modulated voltage signal.

[0114] The modulated voltage signal is compared with a triangular wave to obtain the pulse width modulation signal of the voltage regulator. If the voltage amplitude of the modulated voltage signal is greater than that of the triangular wave, the pulse width modulation signal at the corresponding phase is determined to be a low-level signal, i.e., output 0. If the voltage amplitude of the modulated voltage signal is not greater than that of the triangular wave, the pulse width modulation signal at the corresponding phase is determined to be a high-level signal, i.e., output 1.

[0115] for Figure 6 The value of PI (proportional gain kp and integral gain ki) is important. The larger the value of kp, the smaller the equivalent inductance of each phase of the voltage regulator. However, from the perspective of feedback control, if kp is too large, it is easy to cause oscillation. Therefore, the selection of kp should be moderate.

[0116] S514 controls the voltage regulating device according to the pulse width modulation signal under each phase to regulate the voltage of the target load.

[0117] This application also provides an optional embodiment in which the voltage regulation method is described in detail.

[0118] This application uses a voltage regulation device model built in the MATLAB / Simulink simulation platform to verify the effectiveness and correctness of the control method proposed in this invention. The simulation parameters are shown in Table 1.

[0119] Table 1

[0120]

[0121] To simulate the actual operating state of the voltage regulating equipment and verify the effectiveness of the control method in this application, this application fully considers the dynamic fluctuation of active power transmitted on the grid side. The voltage amplitude at the first stage of the distribution area is 311V, and the voltage amplitudes at the three-phase end stages are 280 / 270 / 260V respectively. The device is not in use within 0.1 seconds, and is put into use after 0.1 seconds, controlling the voltage at the first and last stages of the distribution area to be consistent, thereby improving the voltage quality at the end stages and ensuring the stability of the load voltage. A schematic diagram comparing the first and last voltages of the three-phase distribution network is shown below. Figure 7 As shown in the diagram, the voltage waveform after adjustment by the voltage regulator is as follows: Figure 8 As shown in the diagram, the line voltage drop waveform is as follows: Figure 9 As shown.

[0122] In addition, such as Figure 10 The diagram shown illustrates the line current waveform. The voltage regulating device can adjust the flexible control time and smoothness of the terminal voltage quality improvement according to the different voltage control methods and control requirements of the device, thereby better reducing the inrush current of the line.

[0123] This application proposes a voltage regulation device and control method for improving voltage quality at the end of a distribution network, providing a new approach for the application of three-phase flexible voltage regulation equipment. The proposed voltage regulation device fully utilizes the existing three-phase inverter's follow-up control and employs complete voltage compensation to achieve load voltage stability. The proposed device and control method improve end-point voltage quality while enabling independent three-phase regulation, reducing the withstand voltage requirements and the number of components, thus improving system stability and economy, and providing a reliable guarantee for the stable operation of the voltage regulation equipment. Overall, the proposed device has strong engineering practicality and provides important reference and guidance for the future engineering and practical application of three-phase flexible voltage regulation equipment.

[0124] It is worth noting that this application only uses a single device parameter as an example for analysis. This application can also be applied to power electronic devices of different types, capacities, and withstand voltage levels. In actual engineering applications, the number of devices and parameters can be adjusted according to the actual situation of device selection.

[0125] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0126] Based on the same inventive concept, this application also provides a voltage regulating device for implementing the voltage regulating method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more voltage regulating device embodiments provided below can be found in the limitations of the voltage regulating method described above, and will not be repeated here.

[0127] In one exemplary embodiment, such as Figure 11 As shown, a voltage regulation device is provided, including: an acquisition module 1110, a first determination module 1120, a second determination module 1130, and a control module 1140, wherein:

[0128] The acquisition module 1110 is used to acquire electrical data of the distribution network in at least one phase; the distribution network, the target load, and the voltage regulating device are connected in series in sequence; the voltage regulating device is used to regulate the voltage of the target load; the distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series.

[0129] The first determining module 1120 is used to determine the voltage regulation parameters for each phase based on the electrical data of that phase.

[0130] The second determining module 1130 is used to determine the pulse width modulation signal under the phase according to the voltage adjustment parameters;

[0131] The control module 1140 is used to control the voltage regulating device according to the pulse width modulation signal under each phase, so as to regulate the voltage of the target load.

[0132] In one embodiment, the electrical data includes the first output voltage amplitude and the first output voltage phase of the three-phase AC source, and the impedance data of the impedance load; the first determining module 1120 is specifically used to: determine the second output voltage amplitude and line current data of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, and the impedance data of the impedance load; determine the first active power injected by the three-phase AC source into the distribution network based on the first output voltage amplitude, the first output voltage phase, and the line current data; and determine the second active power consumed by the impedance load based on the first output voltage amplitude, the second output voltage amplitude, and the line current data; and determine the voltage regulation parameters under the phase based on the first active power, the second active power, the second output voltage amplitude, and the line current data.

[0133] The first determining module 1120 is specifically used for: acquiring the line voltage drop phase and the voltage phase of the impedance load in the distribution network; determining the line current data of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, the line voltage drop phase, and the voltage phase of the impedance load; and determining the second output voltage amplitude of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, and the line current data.

[0134] The first determining module 1120 is specifically used to: determine the first initial power injected into the distribution network by the three-phase AC source based on the product of the first output voltage amplitude, the first output voltage phase and the line current data; and take the real part of the first initial power as the first active power.

[0135] The first determining module 1120 is specifically used to: determine the product difference based on the product of the first output voltage amplitude and the first output voltage phase, and the product of the second output voltage amplitude and the second output voltage phase; determine the second initial power consumed by the impedance load based on the product of the product difference and the line current data; and take the real part of the second initial power as the second active power.

[0136] The first determining module 1120 is specifically used for: determining the third active power transmitted by the voltage regulating device based on the difference between the first active power and the second active power; determining the fourth active power transmitted by the voltage regulating device based on the product of the second output voltage amplitude and the line current data; and determining the voltage regulation parameters under the phase based on the third active power and the fourth active power.

[0137] Each module in the aforementioned voltage regulation device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0138] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 12 As shown, this computer device includes a processor, memory, input / output interfaces (I / O), and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores electrical data. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network connection. When the computer program is executed by the processor, it implements a voltage regulation method.

[0139] Those skilled in the art will understand that Figure 12 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0140] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the voltage regulation method provided in any of the above embodiments.

[0141] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the voltage regulation method provided in any of the above embodiments.

[0142] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the voltage regulation method provided in any of the above embodiments.

[0143] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0144] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0145] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A voltage regulation method, characterized in that, The method includes: The system acquires electrical data of the power distribution network in at least one phase; the power distribution network, the target load, and the voltage regulating device are connected in series in sequence; the voltage regulating device is used to regulate the voltage of the target load; the power distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series. For each phase, the voltage regulation parameters for that phase are determined based on the electrical data for that phase. Based on the voltage adjustment parameters, determine the pulse width modulation signal under the specified phase; The voltage regulating device is controlled according to the pulse width modulation signal at each phase to adjust the voltage of the target load.

2. The method according to claim 1, characterized in that, The electrical data includes the first output voltage amplitude and the first output voltage phase of the three-phase AC source, as well as the impedance data of the impedance load; Based on the electrical data for the stated phase, determine the voltage regulation parameters for that phase, including: Based on the first output voltage amplitude, the first output voltage phase, and the impedance data of the impedance load, the second output voltage amplitude and line current data of the voltage regulating device are determined. Based on the first output voltage amplitude, the first output voltage phase, and the line current data, determine the first active power injected by the three-phase AC source into the distribution network; and based on the first output voltage amplitude, the second output voltage amplitude, and the line current data, determine the second active power consumed by the impedance load. The voltage regulation parameters under the specified phase are determined based on the first active power, the second active power, the second output voltage amplitude, and the line current data.

3. The method according to claim 2, characterized in that, The step of determining the second output voltage amplitude and line current data of the voltage regulating device based on the first output voltage amplitude, the first output voltage phase, and the impedance data of the impedance load includes: Obtain the phase of the line voltage drop and the phase of the voltage of the impedance load in the power distribution network; The line current data of the voltage regulating device is determined based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, the line voltage drop phase, and the voltage phase of the impedance load. The second output voltage amplitude of the voltage regulating device is determined based on the first output voltage amplitude, the first output voltage phase, the impedance data of the impedance load, and the line current data.

4. The method according to claim 2, characterized in that, The step of determining the first active power injected into the distribution network by the three-phase AC source based on the first output voltage amplitude, the first output voltage phase, and the line current data includes: The first initial power injected into the distribution network by the three-phase AC source is determined based on the product of the first output voltage amplitude, the first output voltage phase, and the line current data. The real part of the first initial power is taken as the first active power.

5. The method according to claim 2, characterized in that, The step of determining the second active power consumed by the impedance load based on the first output voltage amplitude, the second output voltage amplitude, and the line current data includes: The product difference is determined based on the product of the first output voltage amplitude and the first output voltage phase, and the product of the second output voltage amplitude and the second output voltage phase. The second initial power consumed by the impedance load is determined based on the product of the product difference and the line current data. The real part of the second initial power is taken as the second active power.

6. The method according to claim 2, characterized in that, The step of determining the voltage regulation parameters under the phase based on the first active power, the second active power, the second output voltage amplitude, and the line current data includes: The third active power transmitted by the voltage regulating device is determined based on the difference between the first active power and the second active power. The fourth active power transmitted by the voltage regulating device is determined based on the product of the second output voltage amplitude and the line current data. The voltage regulation parameters under the phase are determined based on the third active power and the fourth active power.

7. A voltage regulating device, characterized in that, The device includes: An acquisition module is used to acquire electrical data of the power distribution network in at least one phase; the power distribution network, the target load, and the voltage regulating device are connected in series in sequence; the voltage regulating device is used to regulate the voltage of the target load; the power distribution network includes a three-phase AC source and an impedance load; the three-phase AC source and the impedance load are connected in series. The first determining module is used to determine the voltage regulation parameters for each phase based on the electrical data for that phase. The second determining module is used to determine the pulse width modulation signal under the phase based on the voltage adjustment parameters; The control module is used to control the voltage regulating device according to the pulse width modulation signal under each phase, so as to adjust the voltage of the target load.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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