A distributed harmonic governance closed-loop control method, device and system

Abstract

This application discloses a distributed harmonic mitigation closed-loop control method, device, and system. The technical solution provided by this application synchronizes the absolute timestamps of data from each measurement terminal using a central control device to achieve a synchronous harmonic snapshot of the power grid. This snapshot is then used for optimization calculations to obtain compensation commands for each harmonic compensation terminal. The central control device then sends this snapshot reference timestamp and the compensation commands to the harmonic compensation terminals to ultimately correct the phase angle of the harmonic compensation output based on their respective output timestamps. This application achieves synchronization between the phase angles of each harmonic compensation output by each harmonic compensation terminal and the actual harmonics measured by the power grid, thereby forming embedded real-time control-level synchronization among multiple terminals. This breaks through the engineering application bottleneck of centralized control of distributed harmonic compensation in distribution networks and improves the effectiveness of distributed harmonic mitigation.

Description

Technical Field

[0001] This application relates to the field of harmonic mitigation technology, and in particular to a distributed harmonic mitigation closed-loop control method, apparatus and system. Background Technology

[0002] Harmonics are essentially a form of interference that "pollutes" the power grid. Harmonic mitigation is crucial for ensuring the safe and stable operation of the power grid. Traditional methods for mitigating harmonic currents within the power distribution area include centralized STATCOM (Static Component Control Unit), which can block harmonics from flowing into the main power grid, but the distribution losses of harmonic currents within the distribution network are considerable. On the other hand, local mitigation using APF (Automatic Power Distribution Unit) is impractical in modern electronic power distribution networks where harmonic sources are ubiquitous.

[0003] In response to this situation, some scholars have proposed the concept of distributed harmonic mitigation. However, current research on distributed harmonic mitigation is based on the assumptions of purely mathematical models. That is, it is assumed that the amplitude of each harmonic current injected by each harmonic source in the power grid is known or can be obtained by a certain algorithm. Then, based on the grid structure and model, the compensation amount of each harmonic to be injected by several compensation nodes is calculated using mathematical methods. However, in practical engineering applications, this harmonic mitigation method has the technical problem of poor mitigation effect. Summary of the Invention

[0004] This application provides a distributed harmonic mitigation closed-loop control method, apparatus, and system to solve the technical problem of poor mitigation effect in existing distributed harmonic mitigation methods in practical engineering applications.

[0005] To address the aforementioned technical problems, the first aspect of this application provides a distributed harmonic mitigation closed-loop control method applied to a central control terminal, wherein the central control terminal is communicatively connected to a harmonic measurement terminal and a harmonic compensation terminal, and the distributed harmonic mitigation closed-loop control method includes:

[0006] Receive harmonic monitoring information sent by multiple harmonic measurement terminals, wherein the harmonic monitoring information includes: harmonic measurement signal and first absolute timestamp;

[0007] The reference absolute timestamp is determined from the first absolute timestamp of each harmonic monitoring information;

[0008] Based on the time difference between the first absolute timestamp of each harmonic monitoring information and the reference absolute timestamp, the phase angle correction of each harmonic measurement signal is calculated respectively, so as to correct the phase angle of each harmonic measurement signal according to the phase angle correction.

[0009] Based on the input of the harmonic measurement signals after each phase angle correction, the optimization calculation module of the whole network distributed harmonic compensation generates multiple harmonic compensation terminal compensation instruction messages, wherein the compensation instruction message contains the reference absolute timestamp and the harmonic compensation instruction of the corresponding harmonic compensation terminal.

[0010] The compensation instruction message is sent to the harmonic compensation terminal, so that the harmonic compensation terminal performs phase angle compensation on the harmonic compensation instruction according to the difference between the local output absolute timestamp and the reference absolute timestamp, and executes the harmonic compensation action based on the compensated harmonic compensation instruction.

[0011] Preferably, determining the reference absolute timestamp from the first absolute timestamp of each harmonic monitoring information specifically includes:

[0012] Based on the harmonic monitoring information sent by each harmonic measurement terminal, a first absolute timestamp is randomly selected from the first absolute timestamps of each harmonic monitoring information as the reference absolute timestamp.

[0013] Preferably, the formula for calculating the phase angle correction is:

[0014]

[0015] In the formula, ω represents the fundamental angular frequency, and i represents the harmonic order to be corrected. T represents the phase angle correction for the i-th harmonic. c It is the difference between the reference absolute timestamp and the first absolute timestamp of the harmonic monitoring information.

[0016] Preferably, based on the input of the harmonic measurement signals after each phase angle correction, the optimization calculation module for network-wide distributed harmonic compensation generates compensation command messages for multiple harmonic compensation terminals, specifically including:

[0017] The harmonic measurement signals after phase angle correction are used as input to the optimization calculation module of the whole network distributed harmonic compensation. The preset distributed harmonic optimization calculation method generates harmonic compensation instructions for multiple harmonic compensation terminals distributed in the power grid.

[0018] A second aspect of this application provides a distributed harmonic mitigation closed-loop control method, applied to a harmonic compensation terminal, wherein the harmonic compensation terminal is communicatively connected to a central control terminal, comprising:

[0019] Receive a compensation instruction message sent by the central control terminal, wherein the compensation instruction message contains the reference absolute timestamp and the harmonic compensation instruction of the corresponding harmonic compensation terminal;

[0020] Based on the difference between the reference absolute timestamp and the locally output absolute timestamp, phase angle compensation is performed on the harmonic compensation command to obtain the compensated harmonic compensation command.

[0021] The harmonic compensation action is executed based on the compensated harmonic compensation command.

[0022] Preferably, the formula for calculating phase angle compensation is:

[0023]

[0024] In the formula, ω represents the fundamental angular frequency, and i represents the harmonic order to be compensated. T represents the angular frequency for compensation of the i-th harmonic. d It is the difference between the reference absolute timestamp and the absolute timestamp locally output by the harmonic compensation terminal.

[0025] A third aspect of this application provides a distributed harmonic mitigation closed-loop control device applied to a central control terminal, wherein the central control terminal is communicatively connected to a harmonic measurement terminal and a harmonic compensation terminal respectively, and the distributed harmonic mitigation closed-loop control device includes:

[0026] The measurement data receiving unit is used to receive harmonic monitoring information sent by the harmonic measurement terminal, wherein the harmonic monitoring information includes: a harmonic measurement signal and a first absolute timestamp;

[0027] The reference time determination unit is used to determine the reference absolute timestamp from the first absolute timestamp of each harmonic monitoring information;

[0028] The phase angle overall synchronization correction unit is used to calculate the phase angle correction amount of each harmonic measurement signal according to the time difference between the first absolute timestamp of each harmonic monitoring information and the reference absolute timestamp, so as to correct the phase angle of each harmonic measurement signal according to the phase angle correction amount.

[0029] The harmonic compensation instruction calculation unit is used to generate compensation instruction messages for multiple harmonic compensation terminals based on the input of the harmonic measurement signals after each phase angle correction, using the whole-network distributed harmonic compensation optimization calculation module.

[0030] The harmonic compensation execution triggering unit is used to generate a compensation instruction message and send it to the harmonic compensation terminal, so that the harmonic compensation terminal performs harmonic compensation according to the harmonic compensation instruction; wherein, the compensation instruction message contains the reference absolute timestamp and the harmonic compensation instruction of the corresponding harmonic compensation terminal.

[0031] The fourth aspect of this application provides a distributed harmonic mitigation closed-loop control device applied to a harmonic compensation terminal, wherein the harmonic compensation terminal is communicatively connected to a harmonic measurement terminal and a central control terminal, comprising:

[0032] The instruction receiving unit is used to receive a compensation instruction message sent by the central control terminal, wherein the compensation instruction message contains the reference absolute timestamp and a harmonic compensation instruction generated based on any one of the harmonic measurement signals.

[0033] The instruction phase compensation unit is used to perform phase angle compensation on the harmonic compensation instruction based on the difference between the reference absolute timestamp and the local output absolute timestamp, so as to obtain the compensated harmonic compensation instruction.

[0034] The compensation action execution control unit is used to execute harmonic compensation actions based on the compensated harmonic compensation command.

[0035] The fifth aspect of this application provides a distributed harmonic mitigation closed-loop control system, comprising: a central control terminal and a plurality of harmonic measurement terminals and harmonic compensation terminals, wherein the central control terminal is communicatively connected to the harmonic measurement terminals and harmonic compensation terminals respectively.

[0036] The central control terminal includes: a first memory and a first processor;

[0037] The first memory is used to store program code corresponding to the distributed harmonic control closed-loop control method provided in the first aspect of this application;

[0038] The first processor is used to execute program code in the first memory;

[0039] The harmonic compensation terminal includes: a second memory and a second processor;

[0040] The second memory is used to store program code corresponding to the distributed harmonic control closed-loop control method provided in the second aspect of this application;

[0041] The second processor is used to execute program code in the second memory.

[0042] Preferably, the central control terminal is connected to the harmonic measurement terminal and the harmonic compensation terminal via 5G mobile communication.

[0043] As can be seen from the above technical solutions, this application has the following advantages:

[0044] The technical solution provided in this application synchronizes the absolute timestamps of data from each measurement terminal using a central control device to achieve phase angle synchronization of the power grid's harmonic snapshot. This snapshot is then used for optimization calculations to obtain compensation instructions for each harmonic compensation terminal. The central control device then sends this snapshot reference timestamp and the compensation instructions to the harmonic compensation terminals to ultimately correct the phase angle of the harmonic compensation output based on their respective output timestamps. This application achieves synchronization between the phase angles of each harmonic compensation output by each harmonic compensation terminal and the actual harmonics measured by the power grid. This creates embedded real-time control-level synchronization among multiple terminals, breaking through the engineering application bottleneck of centralized control of distributed harmonic compensation in distribution networks and improving the effectiveness of distributed harmonic mitigation. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram illustrating the phase difference caused by transmission delay.

[0047] Figure 2 This is a schematic diagram of an embodiment of a distributed harmonic mitigation closed-loop control system provided in this application.

[0048] Figure 3 This is a flowchart illustrating an embodiment of a distributed harmonic mitigation closed-loop control method provided in this application.

[0049] Figure 4 This application provides a timing diagram for the verification and compensation of harmonic measurement data in an embodiment of a distributed harmonic mitigation closed-loop control method.

[0050] Figure 5 This is a schematic diagram of an embodiment of a distributed harmonic mitigation closed-loop control device provided in this application. Detailed Implementation

[0051] Analysis of the shortcomings of current distributed harmonic mitigation methods reveals that current theoretical research on distributed harmonic mitigation, whether focusing on static planning or dynamic adjustment based on the time-varying nature of harmonic sources, is based on purely mathematical models and assumptions detached from engineering practice. Specifically, it assumes that the amplitude of each harmonic current injected by each harmonic source in the power grid is known or can be obtained using a certain algorithm. Then, based on the grid structure and model, mathematical methods are used to calculate the compensation amount of each harmonic to be injected at several compensation nodes.

[0052] However, in practical engineering applications, such as Figure 1 As shown, due to communication and computation delays, the commands issued by the central control unit may have a certain phase difference with the actual harmonic waveform that needs compensation. The key to truly realizing distributed harmonic compensation lies in synchronizing the phase angles of each harmonic compensation output by each harmonic compensation terminal with the actual harmonics measured by the power grid. Otherwise, no matter how perfect the theoretical calculations are, they will lead to the opposite result, making the harmonic compensation device itself a harmonic source. In engineering implementation, accurately synchronizing the harmonic measurement terminals and executing the corresponding harmonic phase angles of the terminals is the biggest bottleneck. This involves multiple levels of uncontrollable and unpredictable communication transmission delays and computation delays. Furthermore, this synchronization requires real-time closed-loop harmonic current compensation calculations using distributed embedded processors, which places new and high demands on real-time performance and synchronization. However, currently, there are no truly engineering-implementable methods, both domestically and internationally, resulting in the current situation where distributed harmonic mitigation technology has poor mitigation effects in practical engineering applications.

[0053] In view of this, embodiments of this application provide a distributed harmonic mitigation closed-loop control method, apparatus, and system to solve the technical problem of poor mitigation effect in practical engineering applications of existing distributed harmonic mitigation methods. This aims to break through the purely theoretical and idealized framework of existing distributed harmonic compensation, and by ensuring high real-time synchronization and high precision of multi-point harmonic compensation phase angles, embedded real-time control-level synchronization is formed among multiple terminals. This truly realizes a unified closed loop for harmonic mitigation, encompassing measurement, central control, and execution across the entire network, thereby helping to overcome the bottleneck in the engineering application of distributed harmonic compensation in distribution networks.

[0054] To make the inventive objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] This embodiment provides a distributed harmonic mitigation closed-loop control system, comprising: a central control terminal and several harmonic measurement terminals and harmonic compensation terminals. The central control terminal is communicatively connected to the harmonic measurement terminals and harmonic compensation terminals respectively. The architecture of the control system is as follows: Figure 2 As shown;

[0056] The central control terminal includes: a first memory and a first processor;

[0057] The first memory is used to store program code corresponding to the distributed harmonic mitigation closed-loop control method provided in the first aspect of this application;

[0058] The first processor is used to execute program code in the first memory;

[0059] The harmonic compensation terminal includes: a second memory and a second processor;

[0060] The second memory is used to store program code corresponding to the distributed harmonic mitigation closed-loop control method provided in the second aspect of this application;

[0061] The second processor is used to execute program code in the second memory.

[0062] More specifically, the central control terminal communicates with the harmonic measurement terminal and the harmonic compensation terminal via 5G mobile communication.

[0063] The distributed harmonic mitigation closed-loop control system provided in this embodiment includes the following components: a central control terminal and several measurement terminals and harmonic compensation terminals.

[0064] For the harmonic measurement terminal, the high-speed sampling module inside the terminal first measures voltage and current signals at designated nodes. After passing through a signal conditioning circuit composed of operational amplifiers, the sampling frequency of the embedded processor's built-in ADC is set to approximately 800kHz-1MHz to achieve high-speed sampling. Furthermore, the measurement terminal and compensation device employ a synchronous timing function with GPS / BSD dual-satellite timing as the primary clock and 5G terrestrial wireless timing and a temperature-controlled crystal oscillator internal timing as backup clocks, providing the highest possible timing accuracy and reliability. The specific workflow is as follows: If an absolute timestamp is sent every half cycle, the data sampled within this half cycle is stored in the MCU's external RAM in 64-bit (8-byte) frames, packaged, and then sent to the central control unit. If RAM space is limited, external flash memory can be used. For the aforementioned transmission process, this invention uses 5G wireless communication to send the harmonic information containing the absolute timestamp to the central control unit for further processing.

[0065] For the central control terminal: First, unpack the information obtained from n harmonic measurement terminals. Then, select any one of the n absolute timestamps and use the selected absolute timestamp as the reference absolute timestamp to synchronize the absolute timestamps of the data from each measurement terminal. At the same time, apply the phase angle compensation algorithm to calculate the harmonic compensation command value after phase angle compensation. Then, repackage the obtained harmonic compensation command value and the reference absolute timestamp and send them to the harmonic compensation terminal.

[0066] For the harmonic compensation terminal: after unpacking, the harmonic compensation instruction value and the reference absolute timestamp are obtained. The phase angle of the harmonic compensation instruction is compensated according to the difference between the local output absolute timestamp and the reference absolute timestamp, and the harmonic compensation action is executed based on the compensated harmonic compensation instruction.

[0067] Please see Figure 3 and Figure 4 This embodiment provides a distributed harmonic mitigation closed-loop control method. This method is applied to a central control terminal, which is communicatively connected to a harmonic measurement terminal and a harmonic compensation terminal. The distributed harmonic mitigation closed-loop control method of the central control terminal includes:

[0068] Step 101: Receive harmonic monitoring information sent by multiple harmonic measurement terminals.

[0069] Each harmonic monitoring information includes: a harmonic measurement signal and a first absolute timestamp, where the first absolute timestamp corresponds to the time point at which the harmonic measurement terminal collected the harmonic measurement signal.

[0070] Step 102: Determine the reference absolute timestamp from the first absolute timestamp of each harmonic monitoring information;

[0071] It should be noted that in step 102, the central control terminal extracts the first absolute timestamp T1 from each of the received harmonic monitoring information, and then determines the reference absolute timestamp Ts from the first absolute timestamps of each harmonic monitoring information. The reference absolute timestamp is preferably selected randomly, or the latest time can be selected as the reference absolute timestamp by comparing the results of each first absolute timestamp.

[0072] Step 103: Based on the time difference between the first absolute timestamp and the reference absolute timestamp of each harmonic monitoring information, calculate the phase angle correction of each harmonic measurement signal, so as to correct the phase angle of each harmonic measurement signal according to the phase angle correction.

[0073] It should be noted that in step 103, based on the reference absolute timestamp Ts obtained in step 102, the phase angle correction of each harmonic measurement signal is calculated by the time difference between the first absolute timestamp of each harmonic monitoring information and the reference absolute timestamp. The formula for calculating the phase angle correction is as follows:

[0074]

[0075] In the formula, ω represents the fundamental angular frequency, and i represents the harmonic order to be corrected. T represents the phase angle correction for the i-th harmonic. cIt is the difference between the baseline absolute timestamp and the first absolute timestamp of the harmonic monitoring information.

[0076] Step 104: Based on the input of the harmonic measurement signals after each phase angle correction, use the whole-network distributed harmonic compensation optimization calculation module to generate compensation instruction messages for multiple harmonic compensation terminals.

[0077] The compensation instruction message contains a reference absolute timestamp and the corresponding harmonic compensation instruction from the harmonic compensation terminal.

[0078] It should be noted that in step 104, based on the phase angle correction calculated in step 103, and based on the optimized calculation module for the whole-network distributed harmonic compensation provided in this embodiment, the harmonic measurement signals after each phase angle correction are used as the input of the module to generate compensation instructions for multiple harmonic compensation terminals.

[0079] In this embodiment, the distributed harmonic compensation calculation module uses the amplitude and phase of each harmonic current obtained from harmonic measurement terminals installed at multiple nodes of the power grid as input to obtain the amplitude and phase of the harmonic voltage at each node and the harmonic current flowing through the load branches of each node in the distribution network. Next, an optimized iterative algorithm is used to calculate the output commands of each harmonic compensation device distributed at multiple nodes of the power grid. The objective function of the optimized iterative algorithm is to minimize the harmonic voltage distortion rate of all nodes in the entire network. The iteration ends when the iteration reaches the required number of iterations or the convergence condition, resulting in the final output current amplitude and phase of each compensation device. Finally, the compensation current amplitude and phase commands output by the compensation devices are used as the output of the distributed harmonic compensation calculation module.

[0080] Among the pre-defined distributed harmonic optimization calculation methods, there are two main categories: traditional optimization calculation methods and intelligent optimization calculation methods. Traditional optimization calculation methods include the steepest descent method, the simplex method, and Newton's iteration method. These methods have advantages such as clear theoretical concepts, simple algorithms, and ease of computer programming implementation. Commonly used intelligent optimization calculation methods include genetic algorithms, simulated annealing algorithms, particle swarm optimization algorithms, and tabu search algorithms. Intelligent optimization design algorithms can effectively solve the problem of traditional optimization design algorithms easily getting trapped in local optima, and have greater global optimization capabilities, thus their applications are more widespread.

[0081] Step 105: Send the compensation instruction message to the harmonic compensation terminal so that the harmonic compensation terminal performs phase angle compensation on the harmonic compensation instruction according to the difference between the local output absolute timestamp and the reference absolute timestamp, and executes the harmonic compensation action based on the compensated harmonic compensation instruction.

[0082] It should be noted that, based on the harmonic compensation instructions generated in step 104, these harmonic compensation instructions are sent to the harmonic compensation terminal through the communication network, so that the harmonic compensation terminal responds to the received compensation instruction message, performs phase angle compensation on the harmonic compensation instruction according to the difference between the local output absolute timestamp and the reference absolute timestamp, and executes the harmonic compensation action based on the compensated harmonic compensation instruction.

[0083] In addition, this application also provides a distributed harmonic mitigation closed-loop control method. This method is applied to a harmonic compensation terminal, which is communicatively connected to a central control terminal. The distributed harmonic mitigation closed-loop control method for the harmonic compensation terminal includes:

[0084] Step 106: Receive the compensation instruction message sent by the central control terminal. The compensation instruction message contains the reference absolute timestamp and the harmonic compensation instruction of the corresponding harmonic compensation terminal.

[0085] Step 107: Based on the difference between the reference absolute timestamp and the local output absolute timestamp, perform phase angle compensation on the harmonic compensation command to obtain the compensated harmonic compensation command.

[0086] More specifically, the phase angle compensation mentioned in step 107 is calculated as follows:

[0087]

[0088] In the formula, ω represents the fundamental angular frequency, and i represents the harmonic order to be compensated. T represents the angular frequency for compensation of the i-th harmonic. d This is the difference between the baseline absolute timestamp and the absolute timestamp output locally by the harmonic compensation terminal.

[0089] It should be noted that in step 107 of this embodiment, the phase angle compensation of the harmonic compensation command is performed based on the time difference between the reference absolute timestamp and the local output absolute timestamp. This eliminates the difference between the local output time T2 of each harmonic compensation terminal and the reference time corresponding to the harmonic compensation command, thereby achieving synchronization between the phase angle of each harmonic compensation output by each harmonic compensation terminal and the harmonics actually measured by the power grid. This forms an embedded real-time control level synchronization among multiple terminals, thereby further improving the accuracy of harmonic compensation.

[0090] Step 108: Execute harmonic compensation action based on the compensated harmonic compensation command.

[0091] The technical solution provided in this embodiment synchronizes the absolute timestamps of data from each measurement terminal using a central control device to achieve phase angle synchronization of the power grid's harmonic snapshot. This snapshot is then used for optimization calculations to obtain compensation instructions for each harmonic compensation terminal. The central control device then sends this snapshot reference timestamp and the compensation instructions to the harmonic compensation terminals to ultimately correct the phase angle of the harmonic compensation output based on their respective output timestamps. This application achieves synchronization between the phase angles of each harmonic compensation output by each harmonic compensation terminal and the actual harmonics measured by the power grid. This creates embedded real-time control-level synchronization among multiple terminals, breaking through the engineering application bottleneck of centralized control of distributed harmonic compensation in distribution networks and improving the effectiveness of distributed harmonic mitigation.

[0092] The above is a detailed description of an embodiment of a distributed harmonic mitigation closed-loop control method provided in this application. The following is a detailed description of an embodiment of a distributed harmonic mitigation closed-loop control device provided in this application.

[0093] Please see Figure 5 This embodiment provides a distributed harmonic mitigation closed-loop control device applied to a central control terminal. The central control terminal is communicatively connected to a harmonic measurement terminal and a harmonic compensation terminal. The distributed harmonic mitigation closed-loop control device in the central control terminal includes:

[0094] The measurement data receiving unit 201 is used to receive harmonic monitoring information sent by the harmonic measurement terminal, wherein the harmonic monitoring information includes: harmonic measurement signal and first absolute timestamp;

[0095] The reference time determination unit 202 is used to determine the reference absolute timestamp from the first absolute timestamp of each harmonic monitoring information;

[0096] The phase angle overall synchronization correction unit 203 is used to calculate the phase angle correction amount of each harmonic measurement signal according to the time difference between the first absolute timestamp and the reference absolute timestamp of each harmonic monitoring information, so as to correct the phase angle of each harmonic measurement signal according to the phase angle correction amount.

[0097] The harmonic compensation instruction calculation unit 204 is used to generate compensation instruction messages for multiple harmonic compensation terminals based on the input of harmonic measurement signals after each phase angle correction using the whole-network distributed harmonic compensation optimization calculation module.

[0098] The harmonic compensation execution triggering unit 205 is used to generate a compensation instruction message and send it to the harmonic compensation terminal so that the harmonic compensation terminal can perform harmonic compensation according to the harmonic compensation instruction; wherein, the compensation instruction message contains a reference absolute timestamp and the harmonic compensation instruction of the corresponding harmonic compensation terminal.

[0099] In addition, the distributed harmonic mitigation closed-loop control device of the harmonic compensation terminal includes:

[0100] The instruction receiving unit 206 is used to receive compensation instruction messages sent by the central control terminal. The compensation instruction messages contain a reference absolute timestamp and a harmonic compensation instruction generated based on any harmonic measurement signal.

[0101] The instruction phase compensation unit 207 is used to perform phase angle compensation on the harmonic compensation instruction based on the difference between the reference absolute timestamp and the local output absolute timestamp, so as to obtain the compensated harmonic compensation instruction.

[0102] The compensation action execution control unit 208 is used to execute harmonic compensation actions based on the compensated harmonic compensation command.

[0103] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the terminals, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0104] In the several embodiments provided in this application, it should be understood that the disclosed terminals, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units through some interfaces, and may be electrical, mechanical, or other forms.

[0105] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0106] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0107] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0108] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0109] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0110] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A distributed harmonic mitigation closed-loop control method, applied to a central control terminal, wherein the central control terminal is communicatively connected to a harmonic measurement terminal and a harmonic compensation terminal, characterized in that, The distributed harmonic mitigation closed-loop control method includes: Receive harmonic monitoring information sent by multiple harmonic measurement terminals, wherein the harmonic monitoring information includes: harmonic measurement signal and first absolute timestamp; The reference absolute timestamp is determined from the first absolute timestamp of each harmonic monitoring information; Based on the time difference between the reference absolute timestamp and the first absolute timestamp of each harmonic monitoring information, the phase angle correction of each harmonic measurement signal is calculated respectively, so as to correct the phase angle of each harmonic measurement signal according to the phase angle correction. Based on the input of the harmonic measurement signals after each phase angle correction, the optimization calculation module of the whole network distributed harmonic compensation generates multiple harmonic compensation terminal compensation instruction messages; wherein, the compensation instruction message contains the reference absolute timestamp and the harmonic compensation instruction of the corresponding harmonic compensation terminal. The compensation instruction message is sent to the harmonic compensation terminal so that the harmonic compensation terminal performs phase angle compensation on the harmonic compensation instruction according to the difference between the reference absolute timestamp and the locally output absolute timestamp, and executes the harmonic compensation action based on the compensated harmonic compensation instruction.

2. The distributed harmonic mitigation closed-loop control method according to claim 1, characterized in that, Determining the reference absolute timestamp from the first absolute timestamp of each harmonic monitoring information specifically includes: Based on the harmonic monitoring information sent by each harmonic measurement terminal, a first absolute timestamp is randomly selected from the first absolute timestamps of each harmonic monitoring information as the reference absolute timestamp.

3. The distributed harmonic mitigation closed-loop control method according to claim 1, characterized in that, The formula for calculating the phase angle correction is: ； In the formula, ω represents the fundamental angular frequency, and i represents the harmonic order to be corrected. T represents the phase angle correction for the i-th harmonic. c It is the difference between the reference absolute timestamp and the first absolute timestamp of the harmonic monitoring information.

4. The distributed harmonic mitigation closed-loop control method according to claim 1, characterized in that, Based on the input of the harmonic measurement signals after each phase angle correction, the optimization calculation module for network-wide distributed harmonic compensation generates compensation command messages for multiple harmonic compensation terminals, specifically including: The harmonic measurement signals after phase angle correction are used as input to the optimization calculation module of the whole network distributed harmonic compensation. The preset distributed harmonic optimization calculation method generates harmonic compensation instructions for multiple harmonic compensation terminals distributed in the power grid.

5. A distributed harmonic mitigation closed-loop control method, applied to a harmonic compensation terminal, wherein the harmonic compensation terminal is communicatively connected to a central control terminal, and the central control terminal is used to execute the distributed harmonic mitigation closed-loop control method as described in any one of claims 1 to 4, characterized in that, include: Receive a compensation instruction message sent by the central control terminal, wherein the compensation instruction message contains a reference absolute timestamp and a harmonic compensation instruction from the corresponding harmonic compensation terminal; Based on the difference between the reference absolute timestamp and the locally output absolute timestamp, phase angle compensation is performed on the harmonic compensation command to obtain the compensated harmonic compensation command. The harmonic compensation action is executed based on the compensated harmonic compensation command.

6. The distributed harmonic mitigation closed-loop control method according to claim 5, characterized in that, The formula for calculating phase angle compensation is: ； In the formula, ω represents the fundamental angular frequency, and i represents the harmonic order to be compensated. T represents the angular frequency for compensation of the i-th harmonic. d It is the difference between the reference absolute timestamp and the absolute timestamp locally output by the harmonic compensation terminal.

7. A distributed harmonic mitigation closed-loop control device, applied to a central control terminal, wherein the central control terminal is communicatively connected to a harmonic measurement terminal and a harmonic compensation terminal, characterized in that... The distributed harmonic mitigation closed-loop control device includes: The measurement data receiving unit is used to receive harmonic monitoring information sent by the harmonic measurement terminal, wherein the harmonic monitoring information includes: a harmonic measurement signal and a first absolute timestamp; The reference time determination unit is used to determine the reference absolute timestamp from the first absolute timestamp of each harmonic monitoring information; The phase angle overall synchronization correction unit is used to calculate the phase angle correction amount of each harmonic measurement signal according to the time difference between the reference absolute timestamp and the first absolute timestamp of each harmonic monitoring information, so as to correct the phase angle of each harmonic measurement signal according to the phase angle correction amount. The harmonic compensation instruction calculation unit is used to generate compensation instruction messages for multiple harmonic compensation terminals using the whole-network distributed harmonic compensation optimization calculation module based on the input of the harmonic measurement signals after each phase angle correction. The compensation instruction message contains the reference absolute timestamp and the harmonic compensation instruction of the corresponding harmonic compensation terminal. The harmonic compensation execution triggering unit is used to generate a compensation instruction message and send it to the harmonic compensation terminal, so that the harmonic compensation terminal performs phase angle compensation on the harmonic compensation instruction according to the difference between the reference absolute timestamp and the locally output absolute timestamp, and executes the harmonic compensation action based on the compensated harmonic compensation instruction.

8. A distributed harmonic mitigation closed-loop control device, applied to a harmonic compensation terminal, wherein the harmonic compensation terminal is communicatively connected to a harmonic measurement terminal and a central control terminal, and the central control terminal is used to execute the distributed harmonic mitigation closed-loop control method as described in any one of claims 1 to 4, characterized in that, include: The instruction receiving unit is used to receive a compensation instruction message sent by the central control terminal, wherein the compensation instruction message contains a reference absolute timestamp and a harmonic compensation instruction generated based on any one of the harmonic measurement signals. The instruction phase compensation unit is used to perform phase angle compensation on the harmonic compensation instruction based on the difference between the reference absolute timestamp and the local output absolute timestamp, so as to obtain the compensated harmonic compensation instruction. The compensation action execution control unit is used to execute harmonic compensation actions based on the compensated harmonic compensation command.

9. A distributed harmonic mitigation closed-loop control system, characterized in that, include: The system includes a central control terminal, several harmonic measurement terminals, and several harmonic compensation terminals. The central control terminal is communicatively connected to the harmonic measurement terminals and the harmonic compensation terminals, respectively. The central control terminal includes: a first memory and a first processor; The first memory is used to store program code corresponding to the distributed harmonic control closed-loop control method as described in any one of claims 1 to 4; The first processor is used to execute program code in the first memory; The harmonic compensation terminal includes: a second memory and a second processor; The second memory is used to store the program code corresponding to the distributed harmonic control closed-loop control method as described in any one of claims 5 to 6; The second processor is used to execute program code in the second memory.

10. A distributed harmonic mitigation closed-loop control system according to claim 9, characterized in that, The central control terminal is connected to the harmonic measurement terminal and the harmonic compensation terminal via 5G mobile communication.

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