A distribution network operation method and system based on voltage regulation

Abstract

The present invention discloses a distribution network operation method and system based on voltage regulation, which relates to the technical field of voltage regulation and power distribution. The distribution network operation method based on voltage regulation includes the following steps: obtaining a resistance state interference score; obtaining an inductance state interference score; obtaining a voltage fluctuation suppression score; and voltage regulation judgment. The present invention obtains the equivalent resistance data and equivalent inductance data of a specified converter station in a preset distribution area and performs corresponding first spectrum analysis and second spectrum analysis to obtain a resistance state interference score and an inductance state interference score, and then determines whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range, and finally determines whether to end voltage regulation based on the obtained voltage data, thereby achieving the effect of improving the voltage stability of the distribution network during the voltage regulation process, and solving the problem of low voltage stability of the distribution network during the voltage regulation process in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage regulation and power distribution, and in particular to a distribution network operation method and system based on voltage regulation. Background Art

[0002] With the continuous growth of global energy demand and advancements in power technology, the operational efficiency, stability, and security of distribution networks, as a critical link in power transmission and distribution, are receiving increasing attention. Traditional distribution network operation methods, often based on fixed voltage and current parameters, are difficult to adapt to the complex and changing power demand and grid conditions. Especially during peak hours, sudden load changes, or network failures, traditional operation methods can lead to serious consequences such as voltage fluctuations, degraded power quality, and even grid collapse. To address these challenges, distribution network operation methods and systems based on voltage regulation have emerged.

[0003] In the existing technology, sensors installed at each node of the distribution network collect operating parameter data in real time and perform data processing and analysis to identify voltage fluctuation trends. Then, a voltage control strategy is formulated based on the voltage fluctuation trend and the voltage level in the distribution network is adjusted in real time. Finally, the regulated voltage level is monitored and evaluated to ensure that the regulation effect achieves the expected goal and realizes precise voltage regulation.

[0004] For example, the invention patent announcement with announcement number: CN111769582B discloses an AC current feedback additional damping control method based on a multi-terminal DC distribution system, including: using the equivalent input and output impedances of the DC side of each converter station and combining the system line parameters to generate an equivalent circuit model of the multi-terminal DC distribution system; loading the equivalent circuit model to obtain the equivalent impedance of the multi-terminal DC distribution system starting from the positive and negative busbars of the constant power control converter station; within the frequency band of interest, using the equivalent impedance of the multi-terminal DC distribution system to obtain the equivalent resistance and equivalent inductance of the multi-terminal DC distribution system; and substituting the equivalent resistance and equivalent inductance into the damping controller parameter solution formula to obtain the configuration parameters of the damping controller.

[0005] For example, the invention patent announcement with announcement number: CN110224411B discloses a method for selecting points and sizing the capacity of a reactive voltage emergency coordinated control system, including: performing transient voltage simulation calculations on the preliminary screening control points under the steady-state flow voltage level, and obtaining the final voltage control point by analyzing the changes in the voltage curves of the preliminary screening control points before and after the fault in the simulation system; analyzing the relationship between the action time of the switching capacitors and reactors at the final control point and the minimum switching measure amount through the simulation system to obtain the minimum measure amount, and at the same time determining the total amount of the switching capacitors and reactors based on the reactive configuration of the switching capacitors and reactors at the final control point; comparing the minimum measure amount with the total amount of the switching capacitors and reactors to determine the final control point, the action time of the switching capacitors and reactors, and the final measure amount.

[0006] However, in the process of implementing the technical solutions of the invention in the embodiments of the present application, the present application found that the above technology has at least the following technical problems:

[0007] In the existing technology, the complex structure of the distribution network makes the formulation and implementation of voltage control strategies more difficult, and it is difficult to ensure that the voltage of all nodes is within an ideal range. There is a problem of low voltage stability in the distribution network during the voltage control process. Summary of the Invention

[0008] The embodiments of the present application solve the problem of low voltage stability of the distribution network during voltage regulation in the prior art by providing a distribution network operation method and system based on voltage regulation, and achieve improved voltage stability of the distribution network during voltage regulation.

[0009] The embodiment of the present application provides a distribution network operation method based on voltage regulation, comprising the following steps: Step 1, obtaining equivalent resistance data of a specified converter station in a preset distribution area, and performing a first frequency domain analysis on the obtained equivalent resistance data to obtain a resistance state interference score, wherein the equivalent resistance data is used to reflect the voltage loss of the distribution network within a preset frequency band, and the resistance state interference score is used to evaluate the degree of voltage fluctuation caused by resistance changes in the distribution network within the preset frequency band; Step 2, obtaining equivalent inductance data of a specified converter station in a preset distribution area, and performing a second frequency domain analysis on the obtained equivalent inductance data to obtain an inductance state interference score, wherein the equivalent inductance data is used to reflect the electromagnetic induction effect of the distribution network within the preset frequency band, and the inductance state interference score is used to evaluate the degree of voltage fluctuation of the distribution network within the preset frequency band. The influence of electromagnetic induction effect caused by inductance change within the frequency band on voltage fluctuation stability; Step three, obtain the voltage fluctuation suppression score by the obtained resistance state interference score and inductance state interference score within the preset voltage fluctuation frequency band, and determine whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range. The voltage fluctuation suppression score is used to quantify the ability of the specified converter station to suppress voltage fluctuations within the preset voltage fluctuation frequency band; Step four, obtain the voltage data of the specified converter station during the voltage regulation process after the configuration parameters are adjusted, and determine whether the obtained voltage data is within the voltage fluctuation range. If so, end the voltage regulation and continue to monitor the voltage fluctuation of the specified converter station within the preset voltage fluctuation frequency band, otherwise perform regulation optimization on the specified converter station.

[0010] Furthermore, the specific process of performing the first frequency domain analysis on the acquired equivalent resistance data is as follows:

[0011] The equivalent resistance data is converted from a first time domain to a first frequency domain through a fast Fourier transform, and a first spectrum analysis is performed on the equivalent resistance data in the first frequency domain to obtain a first spectrum density, where the first spectrum density is used to reflect changes in the equivalent resistance of a specified converter station within a preset frequency band. A determination is made as to whether the first spectrum density is greater than a reference first spectrum density. If so, it indicates that the equivalent resistance of the distribution network within the preset frequency band will cause abnormal voltage fluctuations; otherwise, it indicates that the equivalent resistance of the distribution network within the preset frequency band will not cause abnormal voltage fluctuations.

[0012] Furthermore, the specific steps for obtaining the resistance state interference score include: obtaining the first spectrum density and the first spectrum width in the first spectrum analysis process, the first spectrum density is the ratio of the first frequency domain signal power to the equivalent resistance signal power, the first frequency domain signal power is the signal power of the equivalent resistance in the first frequency domain after the first spectrum analysis, the equivalent resistance signal power is the signal power of the equivalent resistance in the first frequency domain before the first spectrum analysis, and the first spectrum width is the difference between the first frequency domain signal power and the equivalent resistance signal power; performing a ratio operation on the first spectrum width and the reference first spectrum width to obtain a first spectrum width coefficient, the reference first spectrum width is the difference between the maximum allowable first spectrum width and the minimum allowable first spectrum width; performing an addition operation on the second spectrum width coefficient and the first spectrum width coefficient to obtain the resistance state interference score, the second spectrum width coefficient is the sum of the first frequency domain signal power score and the first spectrum density, and the first frequency domain signal power score is the ratio of the absolute value of the difference between the first frequency domain signal power and the reference first frequency domain signal power to the reference first frequency domain signal power.

[0013] Furthermore, the specific process of performing the second frequency domain analysis on the acquired equivalent inductance data is as follows:

[0014] The equivalent inductance data is converted from the second time domain to the second frequency domain through fast Fourier transform, and a second spectrum analysis is performed on the equivalent inductance data in the second frequency domain to obtain a second spectrum density, where the second spectrum density is used to reflect the change of the equivalent inductance of the specified converter station within a preset frequency band. It is determined whether the second spectrum density is greater than the reference second spectrum density. If so, it indicates that the electromagnetic induction magnetic field of the distribution network within the preset frequency band will cause abnormal voltage fluctuations; otherwise, it indicates that the electromagnetic induction magnetic field of the distribution network within the preset frequency band will not cause abnormal voltage fluctuations.

[0015] Furthermore, the specific steps for obtaining the inductance state interference score include: obtaining a temperature coefficient, the temperature coefficient including a first temperature coefficient and a second temperature coefficient, the first temperature coefficient being the ratio of the reactor temperature difference of the reactor in the specified converter station within a preset voltage fluctuation frequency band to the reference reactor temperature, the reactor temperature difference being the difference between the reactor's end operating temperature and the reactor's initial operating temperature, the second temperature coefficient being the ratio of the transformer temperature difference of the transformer in the specified converter station within a preset voltage fluctuation frequency band to the reference transformer temperature, the transformer temperature difference being the difference between the transformer's end operating temperature and the transformer's initial operating temperature; obtaining a second spectrum density in the second spectrum analysis process, performing a logarithmic operation on the exponential operation result of the second spectrum density and the sum of the temperature coefficients to obtain the inductance state interference score, the second spectrum density being the ratio of the second frequency domain signal power to the equivalent inductance signal power, the second frequency domain signal power being the signal power of the equivalent inductance in the second frequency domain after the second spectrum analysis, and the equivalent inductance signal power being the signal power of the equivalent inductance in the second frequency domain before the second spectrum analysis.

[0016] Furthermore, the method for obtaining the voltage fluctuation suppression score is as follows: E1, obtaining the voltage fluctuation amount through the influence of the operating temperature of the reactor and the transformer within the preset voltage fluctuation frequency band on the voltage of the designated converter station, the voltage fluctuation amount includes a first voltage fluctuation amount and a second voltage fluctuation amount, the first voltage fluctuation amount is the absolute value of the difference between the reactor's end operating voltage and the initial operating voltage within the preset voltage fluctuation frequency band, the second voltage fluctuation amount is the absolute value of the difference between the transformer's end operating voltage and the initial operating voltage within the preset voltage fluctuation frequency band; E2, obtaining the voltage fluctuation coefficient, the voltage fluctuation coefficient is the result of the addition operation of the first voltage fluctuation coefficient and the second voltage fluctuation coefficient, the first voltage fluctuation coefficient is the absolute value of the first voltage fluctuation coefficient. The ratio of the voltage fluctuation amount to the reference first voltage fluctuation amount, and the second voltage fluctuation amount coefficient is the ratio of the second voltage fluctuation amount to the reference second voltage fluctuation amount; E3, judge whether the obtained inductance state interference score is within the preset inductance state threshold range, if so, execute E4, otherwise execute E5; E4, obtain the voltage fluctuation suppression score according to the resistance state interference score and the voltage fluctuation amount coefficient; E5, obtain the resistance interference coefficient and the inductance interference coefficient, and obtain the voltage fluctuation suppression score according to the resistance interference coefficient, the inductance interference coefficient and the voltage fluctuation amount coefficient, the resistance interference coefficient is the product of the resistance state interference score and the resistance state interference score weight factor, and the inductance interference coefficient is the product of the inductance state interference score and the inductance state interference score weight factor.

[0017] Furthermore, the specific limiting expression of the voltage fluctuation suppression score is:

[0018] ;

[0019] ;

[0020] ;

[0021] Where y is the number of the preset frequency band, , Y is the total number of preset frequency bands, It represents the voltage fluctuation suppression score of the specified converter station in the y-th preset frequency band, represents the first voltage fluctuation coefficient of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the end-of-operation voltage of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the initial operating voltage of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, represents the reference first voltage fluctuation amount, represents the second voltage fluctuation coefficient of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the transformer end operating voltage of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, It indicates the initial operating voltage of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, represents the reference second voltage fluctuation amount, represents the resistance state interference fraction weight factor, represents the resistance state interference score of the specified converter station in the y-th preset frequency band, represents the inductance state interference fraction weight factor, It represents the inductance state interference fraction of the specified converter station in the preset voltage fluctuation frequency band corresponding to the y-th preset frequency band, Indicates the preset inductance state threshold range.

[0022] An embodiment of the present application provides a distribution network operation system based on voltage regulation, including: a resistance state interference score acquisition module, an inductance state interference score acquisition module, a voltage fluctuation suppression score acquisition module and a voltage regulation judgment module; wherein the resistance state interference score acquisition module is used to acquire equivalent resistance data of a specified converter station in a preset distribution area, and obtain a resistance state interference score by performing a first frequency domain analysis on the acquired equivalent resistance data. The equivalent resistance data is used to reflect the voltage loss of the distribution network within a preset frequency band, and the resistance state interference score is used to evaluate the degree of voltage fluctuation caused by resistance changes in the distribution network within the preset frequency band; the inductance state interference score acquisition module is used to acquire equivalent inductance data of a specified converter station in a preset distribution area, and obtain an inductance state interference score by performing a second frequency domain analysis on the acquired equivalent inductance data. The equivalent inductance data is used to reflect the voltage loss of the distribution network within the preset frequency band. Magnetic induction effect, the inductance state interference score is used to evaluate the impact of the electromagnetic induction effect caused by inductance changes on the voltage fluctuation stability of the distribution network within a preset frequency band; the voltage fluctuation suppression score acquisition module is used to obtain the voltage fluctuation suppression score through the fluctuation of the obtained resistance state interference score and the inductance state interference score within the preset voltage fluctuation frequency band, and determine whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range. The voltage fluctuation suppression score is used to quantify the voltage fluctuation suppression ability of the specified converter station within the preset voltage fluctuation frequency band; the voltage control judgment module is used to obtain the voltage data of the specified converter station in the voltage control process after the configuration parameters are adjusted, and determine whether the obtained voltage data is within the voltage fluctuation range. If so, the voltage control is terminated and the voltage fluctuation of the specified converter station within the preset voltage fluctuation frequency band is continued to be monitored; otherwise, the specified converter station is controlled and optimized.

[0023] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0024] 1. By obtaining the equivalent resistance data and equivalent inductance data of a specified converter station in a preset distribution area and performing corresponding first and second spectrum analyses to obtain the resistance state interference score and the inductance state interference score, then based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range, it is determined whether to perform configuration parameter adjustment. Finally, based on the obtained voltage data, it is determined whether to terminate voltage regulation, thereby improving the accuracy and reliability of obtaining the voltage fluctuation suppression score, and further improving the voltage stability of the distribution network during the voltage regulation process, effectively solving the problem of low voltage stability of the distribution network during the voltage regulation process in the prior art.

[0025] 2. By obtaining the first spectrum density and the first spectrum width in the first spectrum analysis process, and then performing a ratio operation on the first spectrum width and the reference first spectrum width to obtain the first spectrum width coefficient, and finally performing an addition operation on the second spectrum width coefficient and the first spectrum width coefficient to obtain the resistance state interference score, the accuracy of the first spectrum analysis is improved, and the accuracy and reliability of obtaining the resistance state interference score are improved.

[0026] 3. The voltage fluctuation amount is obtained by analyzing the impact of the operating temperature of the reactor and transformer within the preset voltage fluctuation frequency band on the voltage of the specified converter station. Then, the voltage fluctuation amount coefficient is obtained and it is determined whether the obtained inductance state interference score is within the preset inductance state threshold range. If so, the voltage fluctuation suppression score is directly obtained. Otherwise, the resistance interference coefficient and the inductance interference coefficient are obtained, and the voltage fluctuation suppression score is obtained based on this, thereby achieving a more accurate analysis of the voltage fluctuation situation and improving the accuracy of obtaining the voltage fluctuation suppression score. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A flow chart of a distribution network operation method based on voltage regulation provided in an embodiment of the present application;

[0028] Figure 2 A two-dimensional coordinate diagram of the first spectrum width coefficient provided in an embodiment of the present application;

[0029] Figure 3 A two-dimensional coordinate diagram of the second spectrum width coefficient provided in an embodiment of the present application;

[0030] Figure 4 A schematic diagram of the structure of a distribution network operation system based on voltage regulation provided in an embodiment of the present application;

[0031] Figure 5 This is a flowchart of the voltage regulation process provided in the embodiment of the present application. DETAILED DESCRIPTION

[0032] The embodiments of the present application solve the problem of low voltage stability in the voltage regulation process of the distribution network in the prior art by providing a distribution network operation method and system based on voltage regulation. The equivalent resistance data of a designated converter station in a preset distribution area is obtained by a resistance state interference score acquisition module and a first frequency domain analysis is performed to obtain a resistance state interference score. The equivalent inductance data of the designated converter station in the preset distribution area is then obtained by an inductance state interference score acquisition module and a second frequency domain analysis is performed to obtain an inductance state interference score. The voltage fluctuation suppression score acquisition module then determines whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and a voltage fluctuation suppression threshold range. Finally, the voltage control judgment module obtains voltage data of the designated converter station during the voltage regulation process after the configuration parameters are adjusted, and determines whether the obtained voltage data is within the voltage fluctuation range. If so, the voltage control is terminated and the voltage fluctuation of the designated converter station within the preset voltage fluctuation frequency band is continuously monitored. Otherwise, the designated converter station is regulated and optimized, thereby improving the voltage stability of the distribution network during the voltage regulation process.

[0033] The technical solution in the embodiment of the present application is to solve the problem of low voltage stability in the voltage regulation process of the above-mentioned distribution network. The overall idea is as follows:

[0034] The voltage fluctuation suppression score is obtained by analyzing the fluctuations of the resistance state interference score and the inductance state interference score within the preset voltage fluctuation frequency band. Then, based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range, it is determined whether to perform configuration parameter adjustment. Finally, based on the obtained voltage data, it is determined whether to end voltage regulation, thereby achieving the effect of improving the voltage stability of the distribution network during the voltage regulation process.

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0036] like Figure 1As shown, it is a flow chart of a distribution network operation method based on voltage regulation provided by an embodiment of the present application, the method comprising the following steps: step 1, obtaining a resistance state interference score: obtaining equivalent resistance data of a specified converter station in a preset distribution area, and obtaining a resistance state interference score by performing a first frequency domain analysis on the obtained equivalent resistance data, the equivalent resistance data being used to reflect the voltage loss of the distribution network within a preset frequency band, and the resistance state interference score being used to evaluate the voltage fluctuation degree of the distribution network due to resistance changes within the preset frequency band; step 2, obtaining an inductance state interference score: obtaining equivalent inductance data of a specified converter station in a preset distribution area, and obtaining an inductance state interference score by performing a second frequency domain analysis on the obtained equivalent inductance data, the equivalent inductance data being used to reflect the electromagnetic induction effect of the distribution network within the preset frequency band, and the inductance state interference score being used to evaluate the electromagnetic induction effect of the distribution network due to inductance changes within the preset frequency band. The impact of inductive effect on voltage fluctuation stability; Step three, obtain voltage fluctuation suppression score: obtain the voltage fluctuation suppression score through the fluctuation of the obtained resistance state interference score and the inductance state interference score within the preset voltage fluctuation frequency band, and determine whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range. The voltage fluctuation suppression score is used to quantify the ability of the specified converter station to suppress voltage fluctuations within the preset voltage fluctuation frequency band. The configuration parameters include damping coefficient and control gain; Step four, voltage control judgment: obtain the voltage data of the specified converter station during the voltage control process after the configuration parameters are adjusted, and judge whether the obtained voltage data is within the voltage fluctuation range. If so, end the voltage control and continue to monitor the voltage fluctuation of the specified converter station within the preset voltage fluctuation frequency band. Otherwise, perform control optimization on the specified converter station. The control optimization includes transformer tap adjustment and reactor switching.

[0037] In this embodiment, the preset voltage fluctuation frequency band is a frequency band area in which the voltage fluctuation degree of the distribution network in the preset frequency band is greater than the preset voltage fluctuation degree. It should be understood that a preset frequency band only contains one preset voltage fluctuation frequency band; the voltage data and current data of the specified converter station during operation are obtained through the voltage sensor and current sensor built into the specified converter station, and the voltage data and current data are ratio-operated to obtain equivalent resistance data; the current data and magnetic flux data of the specified converter station during operation are obtained through the current sensor and electromagnetic sensor built into the specified converter station, and the magnetic flux data and current data are ratio-operated to obtain equivalent inductance data.

[0038] The voltage fluctuation suppression threshold range represents the range corresponding to the maximum and minimum values ​​of the voltage fluctuation suppression score within the historical voltage fluctuation frequency band in the preset database.

[0039] The voltage fluctuation range indicates the range corresponding to the maximum and minimum values ​​of historical voltage data within the historical voltage fluctuation frequency band in the preset database.

[0040] When the voltage data is within the voltage fluctuation range, it indicates that the voltage fluctuation degree after the configuration parameters are adjusted meets the preset requirements (that is, the voltage regulation has achieved the effect of suppressing voltage fluctuations); when the voltage data is not within the voltage fluctuation range, regulation optimization is required, that is, adjusting the transformer tap (adjusting upward to increase the voltage, adjusting downward to reduce the voltage), or replacing the reactor model until the voltage data is within the voltage fluctuation range, thereby improving the voltage stability of the distribution network during the voltage regulation process.

[0041] Furthermore, the specific process of performing a first frequency domain analysis on the acquired equivalent resistance data is as follows: converting the equivalent resistance data from the first time domain to the first frequency domain through fast Fourier transform, and performing a first spectrum analysis on the equivalent resistance data in the first frequency domain to obtain a first spectrum density, where the first spectrum density is used to reflect the change in the equivalent resistance of the specified converter station within a preset frequency band; judging whether the first spectrum density is greater than the reference first spectrum density; if so, it indicates that the equivalent resistance of the distribution network within the preset frequency band will cause abnormal voltage fluctuations; otherwise, it indicates that the equivalent resistance of the distribution network within the preset frequency band will not cause abnormal voltage fluctuations.

[0042] The specific process of performing a second frequency domain analysis on the acquired equivalent inductance data is as follows: converting the equivalent inductance data from the second time domain to the second frequency domain through fast Fourier transform, and performing a second spectrum analysis on the equivalent inductance data in the second frequency domain to obtain a second spectrum density, where the second spectrum density is used to reflect the change in the equivalent inductance of the specified converter station within a preset frequency band; judging whether the second spectrum density is greater than a reference second spectrum density; if so, it indicates that the electromagnetic induction magnetic field of the distribution network within the preset frequency band will cause abnormal voltage fluctuations; otherwise, it indicates that the electromagnetic induction magnetic field of the distribution network within the preset frequency band will not cause abnormal voltage fluctuations.

[0043] In this embodiment, the reference first spectrum density is represented by summing and averaging the historical first spectrum densities in the historical frequency band in the preset database, and the reference second spectrum density is represented by summing and averaging the historical second spectrum densities in the historical frequency band in the preset database.

[0044] This example applies the Fast Fourier Transform (FFT) algorithm to directly perform first and second spectrum analyses on the equivalent resistance data and equivalent inductance data, respectively. This converts the equivalent resistance data and equivalent inductance data from the first and second time domains (time domains) to the first and second frequency domains (frequency domains), respectively. FFT is an efficient algorithm used to decompose time series signals into sinusoidal components of different frequencies. In this case, the spectrum analyzer can directly obtain the first and second spectrum densities of the equivalent resistance data and equivalent inductance data during the first and second spectrum analyses, respectively. This improves the timeliness of the first and second spectrum analyses and enhances the accuracy and stability of the first and second spectrum analyses of the equivalent resistance data and equivalent inductance data, respectively.

[0045] Furthermore, the specific steps for obtaining the resistance state interference score include: obtaining the first spectrum density and the first spectrum width in the first spectrum analysis process, the first spectrum density is the ratio of the first frequency domain signal power to the equivalent resistance signal power, the first frequency domain signal power is the signal power of the equivalent resistance in the first frequency domain after the first spectrum analysis, the equivalent resistance signal power is the signal power of the equivalent resistance in the first frequency domain before the first spectrum analysis, and the first spectrum width is the difference between the first frequency domain signal power and the equivalent resistance signal power; performing a ratio operation on the first spectrum width and the reference first spectrum width to obtain a first spectrum width coefficient, the reference first spectrum width is the difference between the maximum allowable first spectrum width and the minimum allowable first spectrum width; performing an addition operation on the second spectrum width coefficient and the first spectrum width coefficient to obtain the resistance state interference score, the second spectrum width coefficient is the sum of the first frequency domain signal power score and the first spectrum density, and the first frequency domain signal power score is the ratio of the absolute value of the difference between the first frequency domain signal power and the reference first frequency domain signal power to the reference first frequency domain signal power.

[0046] The first frequency domain signal power and the equivalent resistance signal power are directly obtained by the power sensor, and the reference first spectrum width is represented by the sum and average of the differences corresponding to the maximum and minimum values ​​of the historical first spectrum width in the historical frequency band in the preset database. Therefore The reference first frequency domain signal power is represented by the result of summing and averaging the historical first frequency domain signal powers in the historical frequency band in the preset database.

[0047] In this embodiment, the specific limiting expression of the resistance state interference fraction is:

[0048] ;

[0049] ;

[0050]

[0051] ;

[0052] ;

[0053] Where y is the number of the preset frequency band, , Y is the total number of preset frequency bands, e is a natural constant, represents the resistance state interference score of the specified converter station in the y-th preset frequency band, Indicates the second spectrum width coefficient in the first frequency domain corresponding to the yth preset frequency band of the designated converter station, represents the first spectrum density in the first frequency domain corresponding to the yth preset frequency band of the designated converter station, represents the first frequency domain signal power fraction in the first frequency domain corresponding to the yth preset frequency band of the designated converter station, represents the first frequency domain signal power in the first frequency domain corresponding to the yth preset frequency band of the designated converter station, Indicates the equivalent resistance signal power of the specified converter station in the first frequency domain corresponding to the yth preset frequency band, Indicates the first spectrum width coefficient in the first frequency domain corresponding to the yth preset frequency band of the designated converter station, represents the reference first frequency domain signal power in the first frequency domain, represents the maximum allowed first spectrum width, represents the minimum allowed first spectrum width, represents a reference first spectral density in the first frequency domain.

[0054] Specifically, the constraints for calculating the resistance state interference score are: ,like Figure 2 As shown in FIG. 1 , a two-dimensional coordinate diagram of the first spectrum width coefficient provided in an embodiment of the present application (the second spectrum width coefficient is a fixed value of 0.6 at this time) is obtained by Figure 2 It can be seen that the resistance state interference fraction increases with the increase of the first spectrum width coefficient.

[0055] like Figure 3 As shown in FIG. 1 , a two-dimensional coordinate diagram of the second spectrum width coefficient provided in an embodiment of the present application (the first spectrum width coefficient is a fixed value of 0.9 at this time) is obtained by Figure 3 It can be seen that the resistance state interference fraction increases with the increase of the second spectrum width coefficient.

[0056] It should be understood that since the signal power generated by the equivalent resistance during the first frequency domain analysis is greater than the signal power before the first frequency domain analysis, the first frequency domain signal power is greater than the equivalent resistance signal power, that is, Specifically, the first spectrum width coefficient increases with the increase of the first spectrum width, the first spectrum density increases with the increase of the first frequency domain signal power, and the first frequency domain signal power fraction increases with the increase of the first frequency domain signal power.

[0057] It should be noted that the first spectrum width coefficient also indirectly affects the value of the second spectrum width coefficient. Assuming that within a specific preset frequency band, the first spectrum width coefficient increases from 0.6 to 0.9, as the first spectrum width coefficient increases, the influence of the equivalent resistance state on the signal power increases, resulting in an increase in the first frequency domain signal power. If the increase in the first frequency domain signal power is greater than the reference first frequency domain signal power, then the first frequency domain signal power fraction will increase, and then the second spectrum width coefficient will also increase.

[0058] Through the above analysis and examples, we can more clearly understand how the first spectrum width coefficient indirectly affects the second spectrum width coefficient, and thus affects the value of the resistance state interference score. This helps to evaluate the impact of the resistance state on system stability, thereby achieving improved voltage stability of the distribution network during the voltage regulation process, and effectively solving the problem of low voltage stability of the distribution network during the voltage regulation process in the existing technology.

[0059] Furthermore, a resistance state interference score is obtained, and then the process includes determining whether to obtain a preset voltage fluctuation frequency band based on the resistance state interference score; the specific process of determining whether to obtain a preset voltage fluctuation frequency band based on the resistance state interference score is as follows: determining whether the resistance state interference score is greater than a preset resistance state interference score: if the resistance state interference score is greater than the preset resistance state interference score, it indicates that the voltage fluctuation degree within the preset frequency band is greater than the preset voltage fluctuation degree and the corresponding preset frequency band is recorded as a preset voltage fluctuation frequency band; if the resistance state interference score is not greater than the preset resistance state interference score, the preset frequency band within the preset power distribution area is reselected.

[0060] In this embodiment, the preset resistance state interference score is represented by the sum and average of the historical resistance state interference scores within the historical voltage fluctuation frequency band in a preset database. When the resistance state interference score is not greater than the preset resistance state interference score, it indicates that there is no abnormal voltage fluctuation within the corresponding preset frequency band (in this case, it is not necessary to suppress voltage fluctuations during the voltage control process), and it is necessary to reselect the preset frequency band until the preset voltage fluctuation frequency band exists within the reselected preset frequency band. By comparing the resistance state interference score with the preset resistance state interference score, this example can accurately identify the frequency band causing abnormal voltage fluctuations (i.e., the preset voltage fluctuation frequency band), achieving more accurate analysis of voltage fluctuations and providing strong support for the stable operation of the designated converter station.

[0061] Furthermore, the specific steps for obtaining the inductance state interference score include: obtaining a temperature coefficient, the temperature coefficient includes a first temperature coefficient and a second temperature coefficient, the first temperature coefficient is the ratio of the reactor temperature difference of the reactor in the specified converter station within the preset voltage fluctuation frequency band to the reference reactor temperature, the reactor temperature difference is the difference between the reactor's end operating temperature and the reactor's initial operating temperature, the second temperature coefficient is the ratio of the transformer temperature difference of the transformer in the specified converter station within the preset voltage fluctuation frequency band to the reference transformer temperature, the transformer temperature difference is the difference between the transformer's end operating temperature and the transformer's initial operating temperature, the reactor and the transformer are inductance elements in the specified converter station; obtaining the second spectrum density in the second spectrum analysis process, performing a logarithmic operation on the exponential operation result of the second spectrum density and the sum of the temperature coefficients to obtain the inductance state interference score, the second spectrum density is the ratio of the second frequency domain signal power to the equivalent inductance signal power, the second frequency domain signal power is the signal power of the equivalent inductance in the second frequency domain after the second spectrum analysis, and the equivalent inductance signal power is the signal power of the equivalent inductance in the second frequency domain before the second spectrum analysis.

[0062] Among them, the second frequency domain signal power is directly obtained through the built-in sensor of the designated converter station, the reactor operating temperature and the transformer operating temperature are obtained in real time through the built-in temperature sensor, the reference reactor temperature is represented by the sum and average of the historical reactor operating temperatures within the historical voltage fluctuation frequency band in the preset database, and the reference transformer temperature is represented by the sum and average of the historical transformer operating temperatures within the historical voltage fluctuation frequency band in the preset database.

[0063] In this embodiment, the specific limiting expression of the inductance state interference fraction is:

[0064] ;

[0065] ;

[0066] ;

[0067] ;

[0068] Where y is the number of the preset frequency band, , Y is the total number of preset frequency bands, e is a natural constant, It represents the inductance state interference fraction of the specified converter station in the preset voltage fluctuation frequency band corresponding to the y-th preset frequency band, represents the resistance state interference score of the specified converter station in the y-th preset frequency band, Indicates the preset resistance state interference score, Indicates the first temperature coefficient of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the reactor end operating temperature of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the initial operating temperature of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the reference reactor temperature, represents the second temperature coefficient of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the transformer end operating temperature of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, It indicates the initial operating temperature of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, represents the reference transformer temperature, represents the second spectrum density in the second frequency domain corresponding to the yth preset frequency band of the designated converter station, represents the second frequency domain signal power in the second frequency domain corresponding to the yth preset frequency band of the designated converter station, Indicates the equivalent inductance signal power of the specified converter station in the second frequency domain corresponding to the y-th preset frequency band, represents a reference second spectral density in the second frequency domain.

[0069] It is important to understand that the constraints for calculating the inductance state interference fraction are: Since the signal power generated by the equivalent inductance during the second frequency domain analysis is greater than the signal power before the second frequency domain analysis, the second frequency domain signal power is greater than the equivalent inductance signal power, that is, ; Since transformers and reactors are operating in real time, , .

[0070] Specifically, the inductance state interference score increases with the increase of the first temperature coefficient, the second temperature coefficient and the second spectral density, wherein the first temperature coefficient increases with the increase of the reactor temperature difference, the second temperature coefficient increases with the increase of the transformer temperature difference, and the second spectral density increases with the increase of the second frequency domain signal power.

[0071] It should be noted that the second spectral density also indirectly affects the values ​​of the first and second temperature coefficients. Assuming that within a specific frequency band, an increase in the second spectral density leads to greater fluctuations in current and voltage within that frequency band, which in turn increases losses in the reactor and transformer and raises the temperature, thereby causing a corresponding increase in the first and second temperature coefficients. Since the temperature coefficient and second spectral density are included in the calculation of the inductance state interference score, the final inductance state interference score will also increase.

[0072] The above analysis shows that although the second spectral density does not directly determine the value of the temperature coefficient, it can indirectly affect the temperature of the reactor and transformer, as well as the value of the temperature coefficient, by affecting the current and voltage in the converter station. This indirect influence mechanism helps to more comprehensively understand the calculation process of the inductive state interference fraction and the interaction between various parameters, thereby achieving improved voltage stability in the distribution network during voltage regulation, effectively solving the problem of low voltage stability in the distribution network during voltage regulation in the existing technology.

[0073] Furthermore, the method for obtaining the voltage fluctuation suppression score is as follows: E1, obtaining the voltage fluctuation amount through the influence of the operating temperature of the reactor and the transformer within the preset voltage fluctuation frequency band on the voltage of the designated converter station, the voltage fluctuation amount includes the first voltage fluctuation amount and the second voltage fluctuation amount, the first voltage fluctuation amount is the absolute value of the difference between the reactor's end operating voltage and the initial operating voltage within the preset voltage fluctuation frequency band, the second voltage fluctuation amount is the absolute value of the difference between the transformer's end operating voltage and the initial operating voltage within the preset voltage fluctuation frequency band; E2, obtaining the voltage fluctuation coefficient, the voltage fluctuation coefficient is the result of the addition operation of the first voltage fluctuation coefficient and the second voltage fluctuation coefficient, the first voltage fluctuation coefficient is the absolute value of the first voltage fluctuation coefficient. The ratio of momentum to the reference first voltage fluctuation amount, and the second voltage fluctuation amount coefficient is the ratio of the second voltage fluctuation amount to the reference second voltage fluctuation amount; E3, judge whether the obtained inductance state interference score is within the preset inductance state threshold range, if so, execute E4, otherwise execute E5; E4, obtain the voltage fluctuation suppression score according to the resistance state interference score and the voltage fluctuation amount coefficient; E5, obtain the resistance interference coefficient and the inductance interference coefficient, and obtain the voltage fluctuation suppression score according to the resistance interference coefficient, the inductance interference coefficient and the voltage fluctuation amount coefficient, the resistance interference coefficient is the product of the resistance state interference score and the resistance state interference score weight factor, and the inductance interference coefficient is the product of the inductance state interference score and the inductance state interference score weight factor.

[0074] In this embodiment, the operating voltage of the reactor and the operating voltage of the transformer are measured in real time by built-in voltage sensors. The reference first voltage fluctuation amount is represented by the sum and average of the historical voltage fluctuation amounts of the reactor within the historical voltage fluctuation frequency band in the preset database. The reference second voltage fluctuation amount is represented by the sum and average of the historical voltage fluctuation amounts of the transformer within the historical voltage fluctuation frequency band in the preset database. The preset inductance state threshold range represents the range corresponding to the maximum and minimum values ​​of the historical inductance state scores within the historical voltage fluctuation frequency band in the preset database.

[0075] Specifically, the resistance state interference score weight factor is the weight factor corresponding to the voltage fluctuation suppression score acquisition process in the preset database, which represents the numerical value of the degree of influence of the resistance state interference score on the voltage fluctuation suppression score. When used, the resistance state interference score weight factor corresponding to the resistance state interference score can be directly obtained from the preset database. The corresponding relationship can be a pre-set mapping relationship. For example, the resistance state interference score corresponding to the voltage fluctuation suppression score acquisition process and the weight factor corresponding to the resistance state interference score in the preset database form a mapping set, and the real-time resistance state interference score is input into the mapping set to obtain the corresponding resistance state interference score weight factor. The mapping relationship can be one-to-one or many-to-one. The value range of the resistance state interference score weight factor in this example is .

[0076] It should be noted that the sum of the resistance state interference fraction weight factor and the inductance state interference fraction weight factor is 1.

[0077] Furthermore, the specific limiting expression of the voltage fluctuation suppression fraction is:

[0078] ;

[0079] ;

[0080] ;

[0081] Where y is the number of the preset frequency band, , Y is the total number of preset frequency bands, It represents the voltage fluctuation suppression score of the specified converter station in the y-th preset frequency band, represents the first voltage fluctuation coefficient of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the end-of-operation voltage of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the initial operating voltage of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, represents the reference first voltage fluctuation amount, represents the second voltage fluctuation coefficient of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the transformer end operating voltage of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, It indicates the initial operating voltage of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, represents the reference second voltage fluctuation amount, represents the resistance state interference fraction weight factor, represents the resistance state interference score of the specified converter station in the y-th preset frequency band, represents the inductance state interference fraction weight factor, It represents the inductance state interference fraction of the specified converter station in the preset voltage fluctuation frequency band corresponding to the y-th preset frequency band, Indicates the preset inductance state threshold range.

[0082] In this embodiment, when When , the voltage fluctuation suppression score increases with the increase of the first voltage fluctuation coefficient, the second voltage fluctuation coefficient and the inductance state interference score, wherein the first voltage fluctuation coefficient increases with the increase of the first voltage fluctuation amount, and the second voltage fluctuation coefficient increases with the increase of the second fluctuation amount; when When, assuming At this time, the statistical table of changes in voltage fluctuation suppression scores is shown in Table 1:

[0083] Table 1 Statistics of changes in voltage fluctuation suppression scores

[0084]

[0085] It should be understood that the voltage fluctuation suppression score increases with the increase of the first voltage fluctuation coefficient, the second voltage fluctuation coefficient, the resistance state interference score and the inductance state interference score. It should be noted that the second voltage fluctuation coefficient also indirectly affects the value of the first voltage fluctuation coefficient. Assuming that the transformer in the distribution network is aging, and the reactor and the transformer jointly drive the operation of the specified converter, this may cause the transformer to generate additional voltage fluctuations during operation and attach to the reactor, thereby increasing the second voltage fluctuation and the first voltage fluctuation. Therefore, when the second voltage fluctuation coefficient increases, the first voltage fluctuation coefficient will also increase accordingly.

[0086] By considering the indirect influence of the second voltage fluctuation coefficient on the first voltage fluctuation coefficient, it is helpful to more accurately understand the changing mechanism of the voltage fluctuation suppression fraction, thereby achieving the improvement of the voltage stability of the distribution network during the voltage regulation process, and effectively solving the problem of low voltage stability of the distribution network during the voltage regulation process in the existing technology.

[0087] Furthermore, the specific process of determining whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range is as follows: determine whether the voltage fluctuation suppression score is within the voltage fluctuation suppression threshold range: if the voltage fluctuation suppression score is within the voltage fluctuation suppression threshold range, it indicates that the voltage fluctuation amount of the designated converter station within the preset voltage fluctuation frequency band is within the preset voltage fluctuation amount range, and configuration parameter adjustment is not performed at this time; if the voltage fluctuation suppression score is not within the voltage fluctuation suppression threshold range, it indicates that the voltage fluctuation amount of the designated converter station within the preset voltage fluctuation frequency band exceeds the preset voltage fluctuation amount range, and configuration parameter adjustment is performed at this time and the results of the configuration parameter adjustment are stored in the preset database.

[0088] In this embodiment, the preset voltage fluctuation range represents a range corresponding to a maximum value and a minimum value of historical voltage fluctuations within a historical voltage fluctuation frequency band in a preset database.

[0089] When the voltage fluctuation suppression score is outside the voltage fluctuation suppression threshold range (indicating abnormal voltage fluctuations within the preset voltage fluctuation frequency band), it is necessary to increase the damping coefficient (the damping coefficient affects the system's response speed and stability to voltage fluctuations) to slow down the system's response speed and thereby improve the stability of the voltage waveform (i.e., improve system stability).

[0090] The control gain determines the degree to which the controller in a specified converter station amplifies the voltage fluctuation error. When the voltage fluctuation suppression score is not within the voltage fluctuation suppression threshold range, reducing the control gain can slow down the system response speed, that is, improve the stability of voltage fluctuations during the voltage regulation process.

[0091] like Figure 4As shown, it is a structural schematic diagram of a distribution network operation system based on voltage regulation provided by an embodiment of the present application. A distribution network operation system based on voltage regulation provided by an embodiment of the present application includes: a resistance state interference score acquisition module, an inductance state interference score acquisition module, a voltage fluctuation suppression score acquisition module and a voltage regulation judgment module; wherein, the resistance state interference score acquisition module is used to obtain the equivalent resistance data of a specified converter station in a preset distribution area, and obtain the resistance state interference score by performing a first frequency domain analysis on the obtained equivalent resistance data. The equivalent resistance data is used to reflect the voltage loss of the distribution network within a preset frequency band, and the resistance state interference score is used to evaluate the degree of voltage fluctuation caused by resistance changes in the distribution network within the preset frequency band; the inductance state interference score acquisition module is used to obtain the equivalent inductance data of a specified converter station in the preset distribution area, and obtain the inductance state interference score by performing a second frequency domain analysis on the obtained equivalent inductance data. The equivalent inductance data is used to reflect the electromagnetic induction of the distribution network within the preset frequency band. The inductance state interference score is used to evaluate the impact of the electromagnetic induction effect caused by inductance changes on the voltage fluctuation stability of the distribution network within a preset frequency band; the voltage fluctuation suppression score acquisition module is used to obtain the voltage fluctuation suppression score through the fluctuation of the obtained resistance state interference score and the inductance state interference score within the preset voltage fluctuation frequency band, and determine whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range. The voltage fluctuation suppression score is used to quantify the voltage fluctuation suppression ability of the specified converter station within the preset voltage fluctuation frequency band. The configuration parameters include the damping coefficient and the control gain; the voltage control judgment module is used to obtain the voltage data of the specified converter station during the voltage control process after the configuration parameters are adjusted, and determine whether the obtained voltage data is within the voltage fluctuation range. If so, the voltage control is terminated and the voltage fluctuation of the specified converter station within the preset voltage fluctuation frequency band is continued to be monitored. Otherwise, the specified converter station is optimized for control, and the control optimization includes transformer tap adjustment and reactor switching.

[0092] like Figure 5 As shown, it is an analysis flow chart of the voltage control process provided in an embodiment of the present application. By obtaining the resistance state interference score and the inductance state interference score, the system can accurately analyze the voltage loss and electromagnetic induction effect of the distribution network within a preset frequency band, thereby more accurately evaluating the cause and degree of voltage fluctuations. The voltage fluctuation suppression score is used to quantify the ability of a specified converter station to suppress voltage fluctuations within a preset voltage fluctuation frequency band, thereby determining whether to perform configuration parameter adjustments. This dynamic adjustment mechanism enables the system to improve the efficiency and accuracy of voltage control based on real-time voltage fluctuations. In addition, through real-time analysis and dynamic adjustment, the system can reduce unnecessary voltage fluctuations, reduce losses in the distribution network, and improve the operating efficiency of the power grid.

[0093] To summarize, the embodiment of the present application obtains the equivalent resistance data and equivalent inductance data of a designated converter station within a preset distribution area and performs corresponding first spectrum analysis and second spectrum analysis to obtain the resistance state interference score and the inductance state interference score, and then determines whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range, and finally determines whether to end voltage regulation based on the obtained voltage data, thereby achieving improved accuracy and reliability in obtaining the voltage fluctuation suppression score, and further achieving improved voltage stability of the distribution network during the voltage regulation process, effectively solving the problem of low voltage stability of the distribution network during the voltage regulation process in the prior art.

[0094] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0095] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts 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, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0096] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0098] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0099] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A distribution network operation method based on voltage regulation, characterized in that: The following steps are involved: Step 1: Obtain equivalent resistance data for a specified converter station within a preset distribution area, and perform a first frequency domain analysis on the obtained equivalent resistance data to obtain a resistance state interference score. The equivalent resistance data is used to reflect the voltage loss of the distribution network within a preset frequency band, and the resistance state interference score is used to assess the degree of voltage fluctuation caused by resistance changes in the distribution network within the preset frequency band. Step 2: Obtain equivalent inductance data for a specified converter station within a preset distribution area, and perform a second frequency domain analysis on the obtained equivalent inductance data to obtain an inductance state interference score. The equivalent inductance data is used to reflect the electromagnetic induction effect of the distribution network within a preset frequency band. The inductance state interference score is used to assess the impact of the electromagnetic induction effect caused by inductance changes on the voltage fluctuation stability of the distribution network within the preset frequency band. Step 3: Obtain a voltage fluctuation suppression score based on the obtained resistance state interference score and inductance state interference score fluctuations within a preset voltage fluctuation frequency band, and determine whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range. The voltage fluctuation suppression score is used to quantify the voltage fluctuation suppression capability of the specified converter station within the preset voltage fluctuation frequency band. Step 4: Obtain voltage data of the designated converter station during the voltage control process after the configuration parameters are adjusted, and determine whether the obtained voltage data is within the voltage fluctuation range. If so, terminate the voltage control and continue to monitor the voltage fluctuation of the designated converter station within the preset voltage fluctuation frequency band; otherwise, perform control optimization on the designated converter station; The method for obtaining the voltage fluctuation suppression score is as follows: E1, obtaining a voltage fluctuation amount based on the influence of the operating temperature of the reactor and the transformer within a preset voltage fluctuation frequency band on the voltage of a specified converter station, the voltage fluctuation amount including a first voltage fluctuation amount and a second voltage fluctuation amount, the first voltage fluctuation amount being the absolute value of the difference between the reactor's end-of-operation voltage and the initial operating voltage within the preset voltage fluctuation frequency band, and the second voltage fluctuation amount being the absolute value of the difference between the transformer's end-of-operation voltage and the initial operating voltage within the preset voltage fluctuation frequency band; E2, obtaining a voltage fluctuation coefficient, where the voltage fluctuation coefficient is the result of adding a first voltage fluctuation coefficient and a second voltage fluctuation coefficient, where the first voltage fluctuation coefficient is the ratio of the first voltage fluctuation to a reference first voltage fluctuation, and the second voltage fluctuation coefficient is the ratio of the second voltage fluctuation to the reference second voltage fluctuation; E3, determining whether the obtained inductance state interference score is within a preset inductance state threshold range, if so, executing E4, otherwise executing E5; E4, the voltage fluctuation suppression score is obtained according to the resistance state interference score and the voltage fluctuation coefficient; E5, obtain the resistance interference coefficient and the inductance interference coefficient, and obtain the voltage fluctuation suppression score based on the resistance interference coefficient, the inductance interference coefficient and the voltage fluctuation coefficient. The resistance interference coefficient is the product of the resistance state interference score and the resistance state interference score weight factor, and the inductance interference coefficient is the product of the inductance state interference score and the inductance state interference score weight factor.

2. A distribution network operation method based on voltage regulation according to claim 1, characterized in that: The specific process of performing the first frequency domain analysis on the acquired equivalent resistance data is as follows: converting the equivalent resistance data from a first time domain to a first frequency domain by fast Fourier transform, and performing a first spectrum analysis on the equivalent resistance data in the first frequency domain to obtain a first spectrum density, where the first spectrum density is used to reflect changes in the equivalent resistance of the specified converter station within a preset frequency band; It is determined whether the first spectrum density is greater than the reference first spectrum density. If so, it indicates that the equivalent resistance of the distribution network within the preset frequency band will cause abnormal voltage fluctuations. Otherwise, it indicates that the equivalent resistance of the distribution network within the preset frequency band will not cause abnormal voltage fluctuations.

3. A distribution network operation method based on voltage regulation as claimed in claim 2, characterized in that: The specific steps of obtaining the resistance state interference score include: Obtaining a first spectrum density and a first spectrum width during the first spectrum analysis process, where the first spectrum density is a ratio of the first frequency domain signal power to the equivalent resistance signal power, the first frequency domain signal power is the signal power of the equivalent resistance in the first frequency domain after the first spectrum analysis, the equivalent resistance signal power is the signal power of the equivalent resistance in the first frequency domain before the first spectrum analysis, and the first spectrum width is the difference between the first frequency domain signal power and the equivalent resistance signal power; A first spectrum width coefficient is obtained by performing a ratio operation on the first spectrum width and a reference first spectrum width, wherein the reference first spectrum width is a difference between a maximum allowable first spectrum width and a minimum allowable first spectrum width; The resistance state interference score is obtained by adding the second spectrum width coefficient to the first spectrum width coefficient, where the second spectrum width coefficient is the sum of the first frequency domain signal power score and the first spectrum density, and the first frequency domain signal power score is the ratio of the absolute value of the difference between the first frequency domain signal power and the reference first frequency domain signal power to the reference first frequency domain signal power.

4. A distribution network operation method based on voltage regulation according to claim 1, characterized in that: The step of obtaining the resistance state interference score further includes determining whether to obtain a preset voltage fluctuation frequency band according to the resistance state interference score; The preset voltage fluctuation frequency band is a frequency band area where the voltage fluctuation degree of the distribution network is greater than the preset voltage fluctuation degree; The specific process of determining whether to obtain the preset voltage fluctuation frequency band according to the resistance state interference score is as follows: Determine whether the resistance state interference score is greater than the preset resistance state interference score: If the resistance state interference score is greater than the preset resistance state interference score, it indicates that the voltage fluctuation degree in the preset frequency band is greater than the preset voltage fluctuation degree and the corresponding preset frequency band is recorded as the preset voltage fluctuation frequency band; If the resistance state interference score is not greater than the preset resistance state interference score, a preset frequency band within the preset power distribution area is reselected.

5. A distribution network operation method based on voltage regulation according to claim 1, characterized in that: The specific process of performing the second frequency domain analysis on the acquired equivalent inductance data is as follows: converting the equivalent inductance data from the second time domain to the second frequency domain by fast Fourier transform, and performing a second spectrum analysis on the equivalent inductance data in the second frequency domain to obtain a second spectrum density, where the second spectrum density is used to reflect changes in the equivalent inductance of the specified converter station within a preset frequency band; It is determined whether the second spectrum density is greater than the reference second spectrum density. If so, it indicates that the electromagnetic induction magnetic field of the distribution network within the preset frequency band will cause abnormal voltage fluctuations. Otherwise, it indicates that the electromagnetic induction magnetic field of the distribution network within the preset frequency band will not cause abnormal voltage fluctuations.

6. A distribution network operation method based on voltage regulation as claimed in claim 5, characterized in that: The specific steps of obtaining the inductance state interference score include: Obtaining a temperature coefficient, where the temperature coefficient includes a first temperature coefficient and a second temperature coefficient, where the first temperature coefficient is a ratio of a reactor temperature difference of a reactor in a specified converter station within a preset voltage fluctuation frequency band to a reference reactor temperature, where the reactor temperature difference is a difference between a reactor end operating temperature and a reactor initial operating temperature, and the second temperature coefficient is a ratio of a transformer temperature difference of a transformer in the specified converter station within a preset voltage fluctuation frequency band to a reference transformer temperature, where the transformer temperature difference is a difference between a transformer end operating temperature and a transformer initial operating temperature; Obtain the second spectrum density during the second spectrum analysis process, perform a logarithmic operation on the exponential operation result of the second spectrum density and the sum of the temperature coefficients to obtain the inductance state interference score, the second spectrum density is the ratio of the second frequency domain signal power to the equivalent inductance signal power, the second frequency domain signal power is the signal power of the equivalent inductance in the second frequency domain after the second spectrum analysis, and the equivalent inductance signal power is the signal power of the equivalent inductance in the second frequency domain before the second spectrum analysis.

7. A distribution network operation method based on voltage regulation according to claim 1, characterized in that: The specific limiting expression of the voltage fluctuation suppression fraction is: ； ； ； Where y is the number of the preset frequency band, , Y is the total number of preset frequency bands, It represents the voltage fluctuation suppression score of the specified converter station in the y-th preset frequency band, represents the first voltage fluctuation coefficient of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the end-of-operation voltage of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the initial operating voltage of the reactor in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, represents the reference first voltage fluctuation amount, represents the second voltage fluctuation coefficient of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, Indicates the transformer end operating voltage of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, It indicates the initial operating voltage of the transformer in the specified converter station within the preset voltage fluctuation frequency band corresponding to the yth preset frequency band, represents the reference second voltage fluctuation amount, represents the resistance state interference fraction weight factor, represents the resistance state interference score of the specified converter station in the y-th preset frequency band, represents the inductance state interference fraction weight factor, It represents the inductance state interference fraction of the specified converter station in the preset voltage fluctuation frequency band corresponding to the y-th preset frequency band, Indicates the preset inductance state threshold range.

8. A distribution network operation method based on voltage regulation according to claim 1, characterized in that: The specific process of determining whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range is as follows: Determine whether the voltage fluctuation suppression score is within the voltage fluctuation suppression threshold range: If the voltage fluctuation suppression score is within the voltage fluctuation suppression threshold range, the configuration parameter adjustment is not performed; If the voltage fluctuation suppression score is not within the voltage fluctuation suppression threshold range, the configuration parameter adjustment is performed and the result of the configuration parameter adjustment is stored in a preset database.

9. A distribution network operation system based on voltage regulation, applying the distribution network operation method based on voltage regulation according to any one of claims 1 to 8, comprising: Resistance state interference score acquisition module, inductance state interference score acquisition module, voltage fluctuation suppression score acquisition module and voltage control judgment module; The resistance state interference score acquisition module is used to acquire equivalent resistance data of a specified converter station within a preset distribution area, and to obtain a resistance state interference score by performing a first frequency domain analysis on the acquired equivalent resistance data. The equivalent resistance data is used to reflect the voltage loss of the distribution network within a preset frequency band, and the resistance state interference score is used to assess the degree of voltage fluctuation of the distribution network caused by resistance changes within the preset frequency band. The inductance state interference score acquisition module is used to obtain equivalent inductance data of a specified converter station in a preset distribution area, and to obtain an inductance state interference score by performing a second frequency domain analysis on the obtained equivalent inductance data. The equivalent inductance data is used to reflect the electromagnetic induction effect of the distribution network within a preset frequency band, and the inductance state interference score is used to evaluate the impact of the electromagnetic induction effect caused by inductance changes on the voltage fluctuation stability of the distribution network within the preset frequency band; The voltage fluctuation suppression score acquisition module is used to obtain a voltage fluctuation suppression score based on the fluctuation of the obtained resistance state interference score and the inductance state interference score within a preset voltage fluctuation frequency band, and determine whether to perform configuration parameter adjustment based on the obtained voltage fluctuation suppression score and the voltage fluctuation suppression threshold range. The voltage fluctuation suppression score is used to quantify the voltage fluctuation suppression capability of a specified converter station within the preset voltage fluctuation frequency band; The voltage control judgment module is used to obtain the voltage data of the designated converter station during the voltage control process after the configuration parameters are adjusted, and judge whether the obtained voltage data is within the voltage fluctuation range. If so, the voltage control is terminated and the voltage fluctuation of the designated converter station within the preset voltage fluctuation frequency band is continued to be monitored; otherwise, the designated converter station is controlled and optimized.

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