Intelligent reactive compensation method, device and system based on capacitor life cycle and medium

Abstract

The invention discloses an intelligent reactive compensation method based on the life cycle of a capacitor. According to the method, effective voltage, effective current and harmonic content of a capacitor required in reactive compensation are calculated according to acquired working voltage and working current; the capacitance capacity of the capacitor is determined according to the effective voltage and the effective current obtained through calculation; the life cycle of the capacitor is estimated through the capacitance capacity and the harmonic content of the capacitor, and the intelligent reactive compensation method based on the life cycle of the capacitor is formulated. According to the method, the life cycle of the capacitor can be pre-estimated in advance at the initial stage of attenuation of the capacitor, corresponding early warning and protection measures are taken, and the capacitor is prevented from being damaged in advance or accidents are prevented from expanding.

Description

Technical Field

[0001] This invention relates to the field of power quality, and in particular to intelligent reactive power compensation methods, devices, systems and media based on capacitor lifecycle. Background Technology

[0002] Compared to other passive devices, the parallel capacitors used in reactive power compensation have a shorter service life, mainly affected by the following factors: power frequency overvoltage, switching overvoltage, power frequency overcurrent, harmonic current, ambient temperature, high temperature and low temperature.

[0003] Existing intelligent reactive power compensation methods do not consider the lifecycle of capacitors. There is no real-time monitoring of the capacitor's lifecycle. When the capacitor's operating environment is abnormal or it is in the early stages of degradation, premature capacitor failure or escalation of the problem can render the entire reactive power compensation device inoperable.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide an intelligent reactive power compensation method, device, system, and medium based on the capacitor lifecycle, aiming to solve the technical problem that the inability to estimate the capacitor lifecycle in the prior art leads to accident risks in reactive power compensation.

[0006] To achieve the above objectives, the present invention provides an intelligent reactive power compensation method, which includes the following steps:

[0007] Real-time acquisition of the operating voltage and current required for reactive power compensation;

[0008] Calculate the effective voltage, effective current, and harmonic content of the capacitor used for reactive power compensation based on the operating voltage and operating current.

[0009] The current capacitance of the capacitor is determined based on the effective voltage and effective current;

[0010] The capacitor lifespan is estimated based on the current capacitance and harmonic content, and the reactive power compensation control is adjusted based on the estimated capacitor lifespan.

[0011] Furthermore, the calculation of the effective voltage, effective current, and harmonic content of the capacitor used for reactive power compensation based on the operating voltage and operating current includes:

[0012] Perform a fast Fourier transform on the operating voltage to calculate the corresponding effective voltage value;

[0013] The operating current is subjected to a fast Fourier transform to calculate the corresponding effective value of the current;

[0014] The harmonic content is calculated based on the effective voltage value and the effective current value.

[0015] Furthermore, after determining the current capacitance of the capacitor based on the effective voltage and effective current, the intelligent reactive power compensation method further includes:

[0016] A characteristic curve is generated based on the current capacitance and operating time of the capacitor.

[0017] The characteristic curve and the preset characteristic curve are output and displayed.

[0018] Furthermore, the step of estimating the capacitor's lifespan based on its current capacitance and harmonic content, and adjusting the reactive power compensation control based on the estimated capacitor lifespan, includes:

[0019] The lifespan of the capacitor is estimated based on its current capacitance and harmonic content.

[0020] A warning message will be issued when the estimated capacitor lifespan value reaches a set threshold.

[0021] Furthermore, after issuing a prompt message when the estimated capacitor lifespan reaches a set threshold, the intelligent reactive power compensation method further includes: controlling the reactive power compensation device to stop operating or reduce power operation.

[0022] Furthermore, before acquiring the operating voltage and current of the reactive power compensation capacitor in real time, the intelligent reactive power compensation method further includes:

[0023] Obtain the operating temperature of the capacitor;

[0024] Accordingly, the step of estimating the capacitor lifespan based on the current capacitance and harmonic content of the capacitor, and adjusting the reactive power compensation control scheme based on the estimated capacitor lifespan, includes: estimating the capacitor lifespan based on the current capacitance, harmonic content and operating temperature of the capacitor, and performing reactive power compensation control based on the estimated capacitor lifespan.

[0025] A smart reactive power compensation device based on capacitor lifecycle includes:

[0026] The acquisition module is used to acquire the operating voltage and operating current required for reactive power compensation in real time.

[0027] The parameter calculation module is used to calculate the effective voltage, effective current, and harmonic content of the capacitor used for reactive power compensation based on the operating voltage and operating current.

[0028] A lifecycle calculation module is used to determine the current capacitance of the capacitor based on the effective voltage and effective current.

[0029] The operation module is used to estimate the lifespan of the capacitor based on its current capacitance and harmonic content, and to perform reactive power compensation control based on the estimated lifespan.

[0030] A smart reactive power compensation system based on capacitor lifecycle includes: a computer-readable storage medium and a processor;

[0031] The computer-readable storage medium is used to store executable instructions;

[0032] The processor is used to read executable instructions stored in the computer-readable storage medium and execute the intelligent reactive power compensation method based on capacitor lifecycle.

[0033] A non-transitory computer-readable storage medium storing a computer program that, when executed by a processor, implements the aforementioned intelligent reactive power compensation method based on capacitor lifetime.

[0034] This invention provides a solution that calculates the effective voltage, effective current, and harmonic content of a capacitor based on the operating voltage and current required for reactive power compensation. It then determines the current capacitance of the capacitor based on its effective voltage and current, estimates the capacitor's lifespan using the current capacitance and harmonic content, and finally performs intelligent reactive power compensation based on the estimated lifespan. This invention can predict the capacitor's lifespan in the early stages of capacitor degradation, enabling corresponding early warning and protective measures to prevent premature capacitor damage or escalation of accidents. Attached Figure Description

[0035] Figure 1 This is a flowchart illustrating the first embodiment of the intelligent reactive power compensation method based on the capacitor lifecycle of the present invention.

[0036] Figure 2 for Figure 1 Detailed step diagram of the S200 standard;

[0037] Figure 3 This is a flowchart illustrating the second embodiment of the intelligent reactive power compensation method based on the capacitor lifecycle of the present invention.

[0038] Figure 4 This is a flowchart illustrating the third embodiment of the intelligent reactive power compensation method based on capacitor lifecycle of the present invention.

[0039] Figure 5This is a functional block diagram of an embodiment of the intelligent reactive power compensation method based on capacitor lifecycle of the present invention.

[0040] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0042] In this embodiment, the user equipment can be a high-power electrical device, such as a reactive power compensator. This high-power electrical device also includes multiple capacitors connected in parallel. The appropriate number of capacitors is switched on and off according to the grid or load requirements.

[0043] Reference Figure 1 This invention provides an intelligent reactive power compensation method based on the capacitor lifecycle, the intelligent reactive power compensation method comprising the following steps:

[0044] S100: Real-time acquisition of the operating voltage and current required for reactive power compensation. This can be achieved through methods such as Hall effect sensors.

[0045] S200: Based on the operating voltage and operating current, calculate the effective voltage, effective current, and harmonic content of the capacitor. It should be noted that the obtained operating voltage and operating current are AC values ​​and need to be converted to their corresponding effective values ​​before calculating the harmonic content.

[0046] S300: Determine the current capacitance of the capacitor based on the effective voltage and effective current. The current capacitance calculated here is the current actual capacitance of the capacitor. During use, the capacitance of the capacitor will gradually decrease due to factors such as mains current, voltage, harmonics, and ambient temperature.

[0047] S400: The capacitor's lifespan is estimated based on its current capacitance and harmonic content, and intelligent reactive power compensation is performed based on the estimated lifespan. Here, the correspondence between the capacitor's current capacitance, harmonic content, and lifespan can be obtained in advance using practical experience or experimental methods, and these correspondences can be stored in the reactive power compensation controller. During operation, the capacitor's lifespan can be directly estimated based on its current capacitance and harmonic content.

[0048] This invention calculates the effective voltage, effective current, and harmonic content of a capacitor based on the acquired operating voltage and current. Then, it determines the current capacitance of the capacitor based on the effective voltage and current. The capacitor's lifespan is estimated using the current capacitance and harmonic content, and reactive power compensation is controlled based on the capacitor's lifespan. This invention predicts the capacitor's lifespan in advance when it is in the early stages of degradation, and takes corresponding early warning and protective measures to avoid premature capacitor damage or escalation of accidents.

[0049] Reference Figure 2 The step of calculating the effective voltage, effective current, and harmonic content of the capacitor based on the operating voltage and operating current includes:

[0050] S210: Perform a fast Fourier transform on the operating voltage to calculate the corresponding effective voltage value.

[0051] S220: Perform a Fast Fourier Transform (FFT) on the operating current to calculate the corresponding RMS current value. Since the operating voltage and current collected by the Hall sensor are real-time values, a FFT is needed to convert the real-time values ​​into discrete values ​​in order to calculate the RMS value.

[0052] S230: Calculate the harmonic content based on the effective voltage value and the effective current value. The harmonic content is the percentage of the harmonic power value to the fundamental power value. Therefore, the harmonic content can be obtained by calculating the harmonic power value and the fundamental power value using the effective voltage value and the effective current value.

[0053] Specifically, determining the current capacitance of the capacitor based on the effective voltage and effective current includes: calculating the current capacitance of the capacitor according to the effective voltage, effective current, and a preset formula. It should be noted that this capacitance is the current actual capacitance of the capacitor. Actual capacitance is an important factor characterizing capacitor lifespan.

[0054] Reference Figure 3 , Figure 3 This is a flowchart illustrating the second embodiment of the intelligent reactive power compensation method based on capacitor lifecycle of the present invention. Figure 1 The first embodiment shown presents a second embodiment of the intelligent reactive power compensation method based on capacitor lifecycle of the present invention.

[0055] Furthermore, after determining the current capacitance of the capacitor based on the effective voltage and effective current, the intelligent reactive power compensation method further includes:

[0056] S500: Generate a characteristic curve based on the capacitance and operating time of the capacitor;

[0057] S600: Output and display the characteristic curve and the preset characteristic curve.

[0058] This characteristic curve allows operators to more intuitively understand the capacitor's lifespan. It is displayed on a screen. The preset characteristic curve is a pre-plotted curve showing the capacitance and time characteristics based on historical or experimental data of the capacitor.

[0059] Specifically, the step of estimating the capacitor's lifespan based on its current capacitance and harmonic content, and performing intelligent reactive power compensation based on the estimated lifespan, includes:

[0060] The capacitor's lifespan is estimated based on its current capacitance and harmonic content. The impact of capacitance and harmonic content on capacitor lifespan is not equal; to further improve estimation accuracy, weighting coefficients can be assigned to capacitance and harmonic content. For example, a coefficient of 0.6 can be assigned to capacitance, and a weighting coefficient of 0.4 to harmonic content. The estimation of capacitor lifespan based on capacitance and harmonic content can be obtained using empirical formulas or experiments.

[0061] When the estimated capacitor lifespan reaches a set threshold, a warning message is issued. Furthermore, the warning message can be set to be issued in advance within a certain range of the set threshold, providing early warning and preventing potential problems.

[0062] Furthermore, after issuing a prompt message when the estimated capacitor lifespan reaches a set threshold, the intelligent reactive power compensation method further includes:

[0063] Control the reactive power compensation device to stop operating or reduce power operation. When the capacitor's lifespan is nearing its end, control the reactive power compensation device to take protective measures, improving the reliability and safety of the reactive power compensation device.

[0064] Reference Figure 4 , Figure 4 This is a flowchart illustrating the third embodiment of the intelligent reactive power compensation method based on capacitor lifecycle of the present invention. Figure 2 The second embodiment shown presents a third embodiment of the intelligent reactive power compensation method based on capacitor lifecycle of the present invention.

[0065] Furthermore, before acquiring the operating voltage and current of the reactive power compensation capacitor in real time, the reactive power compensation control method further includes:

[0066] S10a: Obtain the operating temperature of the capacitor; correspondingly, the step of estimating the capacitor's lifespan based on its current capacitance and harmonic content, and performing reactive power compensation control based on the estimated lifespan, includes:

[0067] S400: Estimate the lifespan of the capacitor based on its current capacitance, harmonic content, and operating temperature, and perform reactive power compensation control based on the estimated lifespan.

[0068] It is worth noting that capacitor temperature is also a significant factor affecting its lifespan. In this embodiment, to further improve the accuracy of capacitor lifespan estimation, the surface temperature of the capacitor is also detected. Generally, the higher the temperature, the shorter the capacitor lifespan. The relationship between capacitance, harmonic content, and operating temperature and capacitor lifespan can be obtained based on experimental or historical data. This is then used to estimate the capacitor lifespan.

[0069] To achieve the above objectives, the present invention also proposes a method program for running an intelligent reactive power compensation method on a user equipment. When executed by the user equipment, the intelligent reactive power compensation method program implements the steps of the intelligent reactive power compensation method described above. The intelligent reactive power compensation method program includes:

[0070] Data acquisition module 10 is used to acquire the working voltage and working current required for reactive power compensation in real time;

[0071] The parameter calculation module 20 is used to calculate the effective voltage, effective current and harmonic content of the capacitor based on the operating voltage and operating current.

[0072] The life cycle calculation module 30 is used to determine the current capacitance of the capacitor based on the effective voltage and effective current.

[0073] The operation module 40 is used to estimate the life cycle of the capacitor based on the current capacitance and harmonic content of the capacitor, and to perform reactive power compensation control based on the estimated life cycle of the capacitor.

[0074] Specifically, the parameter calculation module 20 performs a Fast Fourier Transform (FFT) on the operating voltage to calculate the corresponding RMS voltage value. It also performs a FFT on the operating current to calculate the corresponding RMS current value. Since the operating voltage and current collected by the Hall sensor are real-time values, a FFT is needed to convert these real-time values ​​into discrete values ​​to facilitate the calculation of the RMS value. The harmonic content is calculated based on the RMS voltage and current values. The harmonic content is the percentage of the harmonic power value to the fundamental power value. Therefore, by calculating the harmonic power value and the fundamental power value from the RMS voltage and current values, the harmonic content can be obtained.

[0075] Specifically, the lifespan calculation module 30 is used to calculate the current capacitance of the capacitor based on the effective voltage, effective current, and a preset formula. It should be noted that this capacitance is the current actual capacitance of the capacitor. Actual capacitance is an important factor characterizing the capacitor's lifespan.

[0076] Furthermore, the operation module 40 is used to generate a characteristic curve based on the current capacitance and operating time of the capacitor; and output and display the characteristic curve and a preset characteristic curve.

[0077] This characteristic curve allows operators to more intuitively understand the capacitor's lifespan. It is displayed on a screen. The preset characteristic curve is a pre-plotted curve showing the capacitance and time characteristics based on historical or experimental data of the capacitor.

[0078] Specifically, the operation module 40 is used to estimate the lifespan of the capacitor based on its capacitance and harmonic content. The impact of capacitance and harmonic content on the capacitor's lifespan is not the same. To further improve the estimation accuracy, weighting coefficients can be assigned to capacitance and harmonic content. For example, a coefficient of 0.6 can be assigned to capacitance, and a weighting coefficient of 0.4 can be assigned to harmonic content. The estimation of capacitor lifespan based on capacitance and harmonic content can be obtained using empirical formulas or experiments.

[0079] When the estimated capacitor lifespan reaches a set threshold, a warning message is issued. Furthermore, the warning message can be set to be issued in advance within a certain range of the set threshold, providing early warning and preventing potential problems.

[0080] Furthermore, the operation module 40 is used for intelligent reactive power compensation, stopping operation or reducing power operation. When the capacitor's lifespan is nearing its end, the reactive power compensation device is controlled to take protective measures, improving the reliability and safety of the reactive power compensation device.

[0081] Furthermore, the acquisition module 10 is used to acquire the operating temperature of the capacitor. Based on the current capacitance, harmonic content, and operating temperature of the capacitor, the lifespan of the capacitor is estimated, and intelligent reactive power compensation control is performed based on the estimated lifespan.

[0082] It is worth noting that capacitor temperature is also a significant factor affecting its lifespan. In this embodiment, to further improve the accuracy of capacitor lifespan estimation, the surface temperature of the capacitor is also detected. Generally, the higher the temperature, the shorter the capacitor lifespan. The relationship between capacitance, harmonic content, and operating temperature and capacitor lifespan can be obtained based on experimental or historical data. This is then used to estimate the capacitor lifespan.

[0083] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or system. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or system that includes that element.

[0084] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The use of terms such as first, second, and third does not indicate any order and can be interpreted as names.

[0085] Another embodiment of the present invention provides an intelligent reactive power compensation system based on capacitor lifecycle, comprising: a computer-readable storage medium and a processor;

[0086] The computer-readable storage medium is used to store executable instructions;

[0087] The processor is used to read executable instructions stored in the computer-readable storage medium and execute the intelligent reactive power compensation method based on capacitor lifecycle.

[0088] Another embodiment of the present invention provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the aforementioned intelligent reactive power compensation method based on capacitor lifetime.

[0089] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0090] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0091] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0092] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method of intelligent reactive power compensation based on capacitor life cycle, characterized by, The method comprises the following steps: real-time acquisition of working voltage and current required for reactive power compensation; calculation of effective voltage, effective current and harmonic content of the capacitor used for reactive power compensation according to the working voltage and current; determination of the current capacitance of the capacitor based on the effective voltage and current; estimation of the capacitor life cycle according to the current capacitance and harmonic content of the capacitor, and adjustment of the reactive power compensation control according to the estimated capacitor life cycle.

2. The capacitor life cycle based intelligent reactive compensation method as claimed in claim 1 wherein, The calculation of the effective voltage, effective current and harmonic content of the capacitor used for reactive power compensation according to the working voltage and current comprises: fast Fourier transform of the working voltage to obtain the corresponding voltage effective value; fast Fourier transform of the working current to obtain the corresponding current effective value; calculation of the harmonic content based on the voltage effective value and the current effective value.

3. The capacitor life cycle based intelligent reactive compensation method as claimed in claim 2 wherein, After the determination of the current capacitance of the capacitor based on the effective voltage and current, the intelligent reactive power compensation method further comprises: generation of a characteristic curve according to the current capacitance and operating time of the capacitor; output of the characteristic curve and a preset characteristic curve for display.

4. The capacitor life cycle based intelligent reactive compensation method as claimed in claim 1 wherein, The estimation of the capacitor life cycle according to the current capacitance and harmonic content of the capacitor, and the adjustment of the reactive power compensation control according to the estimated capacitor life cycle, comprises: estimation of the capacitor life cycle according to the current capacitance and harmonic content of the capacitor; issuance of a prompt message when the estimated capacitor life cycle value reaches a set threshold.

5. The capacitor life cycle based intelligent reactive compensation method as claimed in claim 4 wherein, After the issuance of the prompt message when the estimated capacitor life cycle reaches the set threshold, the intelligent reactive power compensation method further comprises: control of the reactive power compensation device to stop running or run at a reduced power.

6. The capacitor life cycle based intelligent reactive compensation method as claimed in claim 1 wherein, Before the real-time acquisition of the working voltage and current of the reactive power compensation capacitor, the intelligent reactive power compensation method further comprises: acquisition of the working temperature of the capacitor. Correspondingly, the estimation of the capacitor life cycle according to the current capacitance and harmonic content of the capacitor, and the adjustment of the reactive power compensation control scheme according to the estimated capacitor life cycle, comprises: estimation of the capacitor life cycle according to the current capacitance, harmonic content and working temperature of the capacitor, and reactive power compensation control according to the estimated capacitor life cycle.

7. A capacitor life cycle based intelligent reactive power compensation device, characterized by, comprises: an acquisition module for real-time acquisition of working voltage and current required for reactive power compensation; a parameter calculation module for calculation of effective voltage, effective current and harmonic content of the capacitor used for reactive power compensation according to the working voltage and current; a life cycle calculation module for determination of the current capacitance of the capacitor based on the effective voltage and current; a running module for estimation of the capacitor life cycle according to the current capacitance and harmonic content of the capacitor, and reactive power compensation control according to the estimated capacitor life cycle.

8. A capacitor life cycle based intelligent reactive compensation system comprising: a computer-readable storage medium and a processor; the computer-readable storage medium is used to store executable instructions; The processor is configured to read executable instructions stored in the computer readable storage medium and execute the capacitor life cycle based intelligent reactive compensation method of any one of claims 1-6.

9. A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the capacitor life cycle based intelligent reactive compensation method of any one of claims 1-6.

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