Voltage stability regulation protection method and system of intelligent power distribution cabinet

Abstract

The invention discloses a voltage stabilization regulation protection method and system for an intelligent power distribution cabinet, and belongs to the technical field of regulation protection. Establishing a voltage critical time set of the intelligent power distribution cabinet in a historical normal / abnormal working state; dividing time intervals, and counting the number of voltage critical time of the voltage critical time set in each time interval; calculating a voltage regulation trigger threshold value; acquiring current voltage data and current voltage critical time, counting the occurrence frequency of the voltage critical time of the normal / abnormal working state in the current time interval, and calculating a real-time abnormal voltage proportion; and if the real-time abnormal voltage proportion is greater than the voltage regulation trigger threshold value and the difference value between the current voltage data and the rated voltage is greater than the normal voltage fluctuation range, starting a voltage stability regulation protection mechanism. According to the invention, by combining historical data, real-time monitoring and adaptive adjustment, accurate voltage regulation and control of the intelligent power distribution cabinet are realized, and the safety, reliability and adaptability of a power grid system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of regulation and protection, and particularly to a method and system for voltage stability regulation and protection of intelligent power distribution cabinets. Background Technique

[0002] With the rapid development of industrial automation and smart grid technologies, intelligent power distribution cabinets are increasingly widely used in the power system; in high-reliability scenarios such as industrial production, data centers, and rail transit, the stability of voltage is crucial for equipment safety and production efficiency; however, affected by factors such as grid load fluctuations, power equipment failures, and external interferences (such as lightning strikes and short-term power sags), the voltage inside the power distribution cabinet may fluctuate, even leading to abnormal shutdown of equipment; to ensure voltage stability, existing technologies usually adopt a voltage protection strategy based on static thresholds, such as setting fixed upper and lower voltage limits, and triggering a protection mechanism when the voltage exceeds this range; however, this method cannot dynamically adapt to the changes in load characteristics in different time intervals, and is prone to misjudgment or delayed protection; in addition, some technologies use simple time-window statistical analysis of abnormal voltage events, but do not fully consider the time distribution characteristics of voltage fluctuations, resulting in a low accuracy of the protection mechanism.

[0003] Existing intelligent power distribution cabinet voltage stability regulation technologies fail to make full use of the time-series characteristics of historical voltage data, resulting in a lack of flexibility in setting protection thresholds and being unable to adapt to the voltage change trends in different time intervals; in the process of identifying abnormal voltages, only relying on voltage amplitude judgment and not considering the time distribution law of voltage abnormalities, so that short-term voltage fluctuations may not trigger the regulation mechanism in time; for the voltage regulation process, traditional methods are mostly based on simple fixed compensation methods and do not dynamically adjust the regulation strategy in combination with the real-time voltage abnormality ratio, affecting the accuracy of voltage regulation. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and system for voltage stability regulation and protection of intelligent power distribution cabinets to solve the problems raised in the above background technique.

[0005] To solve the above technical problems, the present invention provides the following technical solutions:

[0006] Voltage stability regulation and protection method for intelligent power distribution cabinets. This method includes the following steps: Step S1: Obtain the voltage critical time in the historical normal working state and the voltage critical time in the historical abnormal working state of the intelligent power distribution cabinet; Step S2: According to the voltage critical time, establish a voltage critical time set in the normal working state of voltage data and a voltage critical time set in the abnormal working state; Divide the time interval, and respectively count the number of voltage critical times of the voltage critical time set in the normal working state of voltage data and the voltage critical time set in the abnormal working state of voltage data in each time interval; Step S3: Based on the number of voltage critical times, calculate the voltage regulation trigger threshold for a single time interval; Obtain the current voltage data and the current voltage critical time, and map them to the corresponding time interval; Count the number of occurrences of the voltage critical time in the abnormal working state and the normal working state in the current time interval, and calculate the real-time abnormal voltage ratio in the current time interval; Step S4: If the real-time abnormal voltage ratio is greater than the voltage regulation trigger threshold, and the difference between the current voltage data and the rated voltage is greater than the normal voltage fluctuation range, then trigger the voltage stability regulation and protection mechanism.

[0007] As a preferred solution of the voltage stability regulation and protection method for the intelligent power distribution cabinet of the present invention, obtain the voltage data log of the intelligent power distribution cabinet in the industrial production in the historical normal working state; According to the voltage data log, extract the time points corresponding to the maximum value and the minimum value of the voltage data of the intelligent power distribution cabinet in the historical normal working state, and record the time points as the voltage critical time of the intelligent power distribution cabinet in the normal working state.

[0008] Obtain the abnormal voltage data log of the intelligent power distribution cabinet in the historical abnormal working state under power supply interruption; According to the abnormal voltage data log, extract the time points corresponding to the maximum value and the minimum value of the abnormal voltage data of the intelligent power distribution cabinet in the historical abnormal working state, and record the time points as the voltage critical time of the intelligent power distribution cabinet in the abnormal working state.

[0009] As a preferred solution of the voltage stability regulation and protection method for the intelligent power distribution cabinet of the present invention, according to the voltage critical time of the intelligent power distribution cabinet in the normal and abnormal working states, establish a voltage critical time set in the normal working state of voltage data and a voltage critical time set in the abnormal working state, and respectively record the voltage critical time set in the normal working state of voltage data and the voltage critical time set in the abnormal working state as VCT norm and VCT abn .

[0010] Evenly divide the time within a day into N time intervals, and count the voltage critical time set VCT of the voltage data in the normal working state normThe number of voltage critical times in each time interval and the set VCT of voltage critical times in the abnormal working state of voltage data abn The number of voltage critical times in each time interval; respectively, the set VCT of voltage critical times in the normal working state of voltage data norm and the set VCT of voltage critical times in the abnormal working state of voltage data abn The number of voltage critical times in the i-th time interval is denoted as N i |VCT norm | and N i |VCT abn |.

[0011] As a preferred solution of the voltage stability regulation and protection method of the intelligent power distribution cabinet described in the present invention, based on the set VCT of voltage critical times in the normal working state of voltage data norm The number N of voltage critical times in the i-th time interval i |VCT norm | and the set VCT of voltage critical times in the abnormal working state of voltage data abn The number N of voltage critical times in the i-th time interval i |VCT abn |, calculate the voltage regulation trigger threshold for the i-th time interval, and the calculation formula is as follows:

[0012]

[0013] Among them, VRT i represents the voltage regulation trigger threshold for the i-th time interval, α represents a preset abnormal proportion influence factor, and β represents a preset threshold offset.

[0014] It should be noted that the in this formula reflects the proportion of abnormal voltage critical times in the total critical times (the sum of normal and abnormal) in a specific time interval. The higher the proportion, the more frequent the abnormal voltage situation in this time interval, which means the voltage state is more unstable and the adjustment needs to be triggered more. Introducing the preset abnormal proportion influence factor α and the preset threshold offset β increases the flexibility of threshold setting. α can adjust the influence weight of the abnormal voltage time proportion on the threshold. If the power distribution cabinet has extremely high requirements for voltage stability, α can be increased to make the influence of the abnormal voltage time proportion more significant; β, as the basic threshold offset, can be set according to the actual situation such as the importance of the power distribution cabinet and the load characteristics. For example, for the power distribution cabinet of important equipment, β can be appropriately increased to make it easier to trigger the regulation and protection.

[0015] Obtain the current voltage data of the intelligent power distribution cabinet in real time, and the time points corresponding to the maximum and minimum values of the current voltage data, and map the time points to the corresponding time intervals; count the number of occurrences of the voltage critical time in the abnormal working state and the number of occurrences of the voltage critical time in the normal working state within the time that has passed in the current time interval, and calculate the real-time abnormal voltage ratio in the current time interval. The calculation formula is as follows:

[0016]

[0017] Among them, P i_real represents the real-time abnormal voltage ratio in the i-th time interval, and N i_real |at abn | represents the number of real-time occurrences of the voltage critical time in the abnormal working state in the i-th time interval, and N i_real |nt norm | represents the number of real-time occurrences of the voltage critical time in the normal working state in the i-th time interval.

[0018] As a preferred solution of the voltage stability regulation and protection method of the intelligent power distribution cabinet described in the present invention, based on the real-time abnormal voltage ratio P i_real in the i-th time interval, if the real-time abnormal voltage ratio P i_real in the i-th time interval is greater than the voltage regulation trigger threshold VRT i of the i-th time interval, and |U current -U rated |>ΔU, then trigger the voltage stability regulation and protection mechanism, where U current represents the current voltage data of the intelligent power distribution cabinet, U rated represents the preset rated voltage of the intelligent power distribution cabinet, and ΔU represents the preset normal voltage fluctuation range.

[0019] The voltage stability regulation and protection mechanism is specifically as follows:

[0020] Based on the current voltage data U current of the intelligent power distribution cabinet and the preset rated voltage U rated of the intelligent power distribution cabinet, calculate the tap adjustment position of the transformer in the intelligent power distribution cabinet. The calculation formula is as follows:

[0021]

[0022] Among them, ΔTAP represents the number of tap adjustment positions of the transformer in the intelligent power distribution cabinet (usually a floating point number, which needs to be rounded to an integer), and ΔU tap represents the voltage adjustment amplitude per tap of the transformer (set according to standard specifications and industry requirements).

[0023] Based on the number of tap adjustment positions ΔTAP of the transformer in the intelligent power distribution cabinet, voltage stability adjustment is performed.

[0024] It should be noted that in the formula, U rated is the preset rated voltage of the intelligent power distribution cabinet, that is, the voltage value expected to be achieved after adjusting the transformer tap; U current is the current actual voltage value; ΔU tap is the voltage adjustment amount per tap of the transformer. By calculating U rated -U current the difference between the current voltage and the target voltage can be obtained. Dividing this difference by ΔU tap the obtained ΔTAP not only reflects the number of tap positions that need to be adjusted, but also contains the adjustment direction information. Specifically: when ΔTAP is greater than 0, it means that the current voltage is lower than the target voltage, and the tap position needs to be raised to increase the voltage, because raising the tap position will increase the transformation ratio of the transformer, thereby increasing the output voltage; when ΔTAP is less than 0, it means that the current voltage is higher than the target voltage, and the tap position needs to be lowered to reduce the voltage, and lowering the tap position will reduce the transformation ratio of the transformer and the output voltage will decrease.

[0025] The voltage stability adjustment protection system of the intelligent power distribution cabinet. This system includes: a voltage critical time acquisition module, a time set construction and quantity statistics module, a trigger threshold and voltage ratio calculation module, and an analysis and voltage stability adjustment module.

[0026] The voltage critical time acquisition module: acquires the voltage critical time in the historical normal working state and the voltage critical time in the historical abnormal working state of the intelligent power distribution cabinet.

[0027] The time set construction and quantity statistics module: based on the voltage critical time, establishes a voltage critical time set in the normal working state of the voltage data and a voltage critical time set in the abnormal working state; divides the time interval, and respectively counts the number of voltage critical times in each time interval of the voltage critical time set in the normal working state of the voltage data and the voltage critical time set in the abnormal working state of the voltage data.

[0028] The trigger threshold and voltage ratio calculation module: based on the number of voltage critical times, calculates the voltage adjustment trigger threshold for a single time interval; acquires the current voltage data and the current voltage critical time, and maps them to the corresponding time interval; counts the number of occurrences of the voltage critical time in the abnormal working state and the normal working state in the current time interval, and calculates the real-time abnormal voltage ratio in the current time interval.

[0029] The analysis and voltage stability regulation module: If the ratio of the real-time abnormal voltage is greater than the voltage regulation trigger threshold, and the difference between the current voltage data and the rated voltage is greater than the normal voltage fluctuation range, then the voltage stability regulation protection mechanism is triggered.

[0030] Further, the voltage critical time acquisition module includes a normal voltage critical time acquisition unit and an abnormal voltage critical time acquisition unit;

[0031] The normal voltage critical time acquisition unit: acquires the voltage data log of the intelligent power distribution cabinet in the industrial production during the historical normal working state; according to the voltage data log, extracts the time points corresponding to the maximum and minimum values of the voltage data of the intelligent power distribution cabinet in the historical normal working state, and records the time points as the voltage critical time of the intelligent power distribution cabinet in the normal working state;

[0032] The abnormal voltage critical time acquisition unit: acquires the abnormal voltage data log of the intelligent power distribution cabinet in the historical abnormal working state under the influence of voltage sags; according to the abnormal voltage data log, extracts the time points corresponding to the maximum and minimum values of the abnormal voltage data of the intelligent power distribution cabinet in the historical abnormal working state, and records the time points as the voltage critical time of the intelligent power distribution cabinet in the abnormal working state.

[0033] Further, the time set construction and quantity statistics module includes a time set construction unit and a quantity statistics unit;

[0034] The time set construction unit: based on the voltage critical time of the intelligent power distribution cabinet in the normal and abnormal working states, establishes the voltage critical time set in the normal working state of the voltage data and the voltage critical time set in the abnormal working state;

[0035] The quantity statistics unit: evenly divides the time within a day into N time intervals, and statistics the quantity of voltage critical times in each time interval of the voltage critical time set in the normal working state of the voltage data and the quantity of voltage critical times in each time interval of the voltage critical time set in the abnormal working state of the voltage data.

[0036] Further, the trigger threshold and voltage ratio calculation module includes a trigger threshold calculation unit and a voltage ratio calculation unit;

[0037] The trigger threshold calculation unit: based on the quantity of voltage critical times in a single time interval of the voltage critical time set in the normal working state of the voltage data and the quantity of voltage critical times in a single time interval of the voltage critical time set in the abnormal working state of the voltage data, calculates the voltage regulation trigger threshold for a single time interval;

[0038] The voltage ratio calculation unit: obtains the current voltage data of the intelligent power distribution cabinet in real time, and the time points corresponding to the maximum and minimum values of the current voltage data, and maps the time points to the corresponding time intervals; counts the number of occurrences of the voltage critical time in the abnormal working state and the number of occurrences of the voltage critical time in the normal working state within the elapsed time in the current time interval, and calculates the real-time abnormal voltage ratio within the current time interval.

[0039] Furthermore, the analysis and voltage stability regulation module includes an analysis unit and a voltage stability regulation unit;

[0040] The analysis unit: based on the real-time abnormal voltage ratio within a single time interval, if the real-time abnormal voltage ratio within a single time interval is greater than the voltage regulation trigger threshold of the single time interval, and the difference between the current voltage data of the intelligent power distribution cabinet and the rated voltage of the preset intelligent power distribution cabinet is greater than the preset normal voltage fluctuation range, then trigger the voltage stability regulation protection mechanism;

[0041] The voltage stability regulation unit: the voltage stability regulation protection mechanism is specifically as follows: based on the current voltage data of the intelligent power distribution cabinet and the rated voltage of the preset intelligent power distribution cabinet, calculate the tap adjustment position of the transformer in the intelligent power distribution cabinet; based on the number of tap adjustment positions of the transformer in the intelligent power distribution cabinet, perform voltage stability regulation.

[0042] Compared with the prior art, the beneficial effects achieved by the present invention are: in the voltage stability regulation protection method and system of the intelligent power distribution cabinet provided by the present invention, by obtaining the voltage critical time of the intelligent power distribution cabinet in the historical normal and abnormal working states, a reference data of the voltage state is established, providing a historical basis for subsequent analysis; dividing time intervals according to the voltage critical time data set, counting the voltage abnormality frequencies in different intervals, accurately quantifying the voltage fluctuation characteristics from the time dimension, and laying a foundation for setting dynamic thresholds; calculating the voltage regulation trigger threshold based on the abnormal voltage ratio, and statistically counting the abnormal voltage ratio in the current time interval in real time, so as to realize the rapid identification of abnormal voltage conditions and improve the timeliness of response; when the real-time abnormal voltage ratio exceeds the threshold and the voltage deviation exceeds the normal fluctuation range, trigger the voltage stability regulation protection mechanism, and accurately adjust the voltage according to the calculated tap adjustment position of the transformer to ensure the stability and safety of the power system. Generally speaking, the present invention realizes the precise voltage regulation of the intelligent power distribution cabinet by combining historical data, real-time monitoring and adaptive regulation, and improves the safety, reliability and adaptability of the power grid system. Description of the Drawings

[0043] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification, and are used to explain the present invention together with the embodiments of the present invention, and do not constitute a limitation to the present invention.

[0044] Figure 1 It is a schematic diagram of the steps of the voltage stability regulation and protection method of the intelligent power distribution cabinet of the present invention;

[0045] Figure 2 It is a schematic diagram of the structure of the voltage stability regulation and protection system of the intelligent power distribution cabinet of the present invention. Detailed implementation manners

[0046] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0047] Please refer to Figure 1 , in the first embodiment: A voltage stability regulation and protection method for an intelligent power distribution cabinet is provided. The method includes the following steps:

[0048] Step S1: Obtain the voltage critical time in the historical normal working state and the voltage critical time in the historical abnormal working state of the intelligent power distribution cabinet.

[0049] Specifically, obtain the voltage data log of the intelligent power distribution cabinet in the historical normal working state during industrial production; according to the voltage data log, extract the time points corresponding to the maximum and minimum values of the voltage data of the intelligent power distribution cabinet in the historical normal working state, and record the time points as the voltage critical time of the intelligent power distribution cabinet in the normal working state.

[0050] Further, obtain the abnormal voltage data log of the intelligent power distribution cabinet in the historical abnormal working state under power supply interruption; according to the abnormal voltage data log, extract the time points corresponding to the maximum and minimum values of the abnormal voltage data of the intelligent power distribution cabinet in the historical abnormal working state, and record the time points as the voltage critical time of the intelligent power distribution cabinet in the abnormal working state.

[0051] It should be noted that the existing voltage stability monitoring technology mainly focuses on the fluctuation range of the voltage value, while ignoring its distribution law on the time axis. Introducing the concept of voltage critical time enables the system to analyze the voltage state based on time series data, rather than simply relying on numerical judgment. This can more accurately identify the voltage fluctuation pattern and avoid misjudging the equipment state due to short-term voltage anomalies.

[0052] Step S2: Based on the voltage critical time, establish a voltage critical time set in the normal operating state of the voltage data and a voltage critical time set in the abnormal operating state; divide the time interval, and respectively count the number of voltage critical times in each time interval for the voltage critical time set in the normal operating state of the voltage data and the voltage critical time set in the abnormal operating state of the voltage data.

[0053] Specifically, based on the voltage critical time of the intelligent power distribution cabinet in the normal and abnormal operating states, establish a voltage critical time set in the normal operating state of the voltage data and a voltage critical time set in the abnormal operating state, and respectively denote the voltage critical time set in the normal operating state of the voltage data and the voltage critical time set in the abnormal operating state as VCT norm and VCT abn 。

[0054] Further, evenly divide the time in a day into N time intervals, and count the number of voltage critical times in each time interval for the voltage critical time set VCT norm in the normal operating state of the voltage data and the number of voltage critical times in each time interval for the voltage critical time set VCT abn in the abnormal operating state of the voltage data; respectively denote the voltage critical time set VCT norm in the normal operating state of the voltage data and the voltage critical time set VCT abn in the abnormal operating state of the voltage data at the i-th time interval as N i |VCT norm | and N i |VCT abn |。

[0055] It should be noted that traditional methods mostly use a single time window for voltage fluctuation analysis and cannot identify the periodic characteristics of abnormal voltages. This method can discover the time-varying characteristics of the power grid load by counting the abnormal voltage frequencies in different time intervals; for example, during the peak period of industrial electricity load, voltage fluctuations may be more frequent, so reasonable time interval division can improve the adjustment accuracy.

[0056] Step S3: Based on the number of voltage critical times, calculate the voltage regulation trigger threshold for a single time interval; obtain the current voltage data and the current voltage critical time, and map them to the corresponding time interval; count the number of occurrences of the voltage critical time in the abnormal and normal operating states within the current time interval, and calculate the real-time abnormal voltage ratio within the current time interval.

[0057] Specifically, based on the voltage critical time set VCT norm in the normal operating state of the voltage data at the i-th time interval and the number of voltage critical times N i|VCT norm |and the voltage critical time set VCT in the abnormal working state of the voltage data abn The number N of voltage critical times in the i-th time interval i |VCT abn |, calculate the voltage regulation trigger threshold for the i-th time interval, and the calculation formula is as follows:

[0058]

[0059] Among them, VRT i represents the voltage regulation trigger threshold for the i-th time interval, α represents a preset abnormal proportion influence factor, and β represents a preset threshold offset;

[0060] It should be noted that the in this formula reflects the proportion of abnormal voltage critical time in the total critical time (the sum of normal and abnormal) within a specific time interval. The higher the proportion, the more frequent the abnormal voltage situation in this time interval, which means the voltage state is more unstable and the adjustment needs to be triggered more. Introducing the preset abnormal proportion influence factor α and the preset threshold offset β increases the flexibility of threshold setting. α can adjust the influence weight of the abnormal voltage time proportion on the threshold. If the power distribution cabinet has extremely high requirements for voltage stability, α can be increased to make the influence of the abnormal voltage time proportion more significant; β, as the basic threshold offset, can be set according to the actual situation such as the importance of the power distribution cabinet and the load characteristics. For example, for the power distribution cabinet of important equipment, β can be appropriately increased to make it easier to trigger the adjustment protection.

[0061] Furthermore, the current voltage data of the intelligent power distribution cabinet and the time points corresponding to the maximum and minimum values of the current voltage data are obtained in real time, and the time points are mapped to the corresponding time intervals; the number of occurrences of the voltage critical time in the abnormal working state and the number of occurrences of the voltage critical time in the normal working state within the past time in the current time interval are counted, and the real-time abnormal voltage proportion in the current time interval is calculated. The calculation formula is as follows:

[0062]

[0063] Among them, P i_real represents the real-time abnormal voltage proportion in the i-th time interval, N i_real |at abn |represents the number of real-time occurrences of the voltage critical time in the abnormal working state in the i-th time interval, N i_real |nt norm |represents the number of real-time occurrences of the voltage critical time in the normal working state in the i-th time interval.

[0064] It should be noted that most of the existing methods use a fixed threshold to trigger voltage regulation and cannot adapt to the load fluctuations in different time periods. Through time interval division and dynamic calculation, the present invention enables the threshold to adapt to different operating states. For example, in the case of low industrial load at night, even if there are large voltage fluctuations, the regulation may not be triggered. While during high-load operation during the day, the requirement for voltage stability is higher, and the system can adjust more sensitively.

[0065] Step S4: If the real-time abnormal voltage ratio is greater than the voltage regulation trigger threshold, and the difference between the current voltage data and the rated voltage is greater than the normal voltage fluctuation range, then the voltage stability regulation protection mechanism is triggered.

[0066] Specifically, based on the real-time abnormal voltage ratio P in the i-th time interval i_real , if the real-time abnormal voltage ratio P in the i-th time interval i_real is greater than the voltage regulation trigger threshold VRT of the i-th time interval i , and |U current -U rated |>ΔU, then the voltage stability regulation protection mechanism is triggered, where U current represents the current voltage data of the intelligent power distribution cabinet, U rated represents the preset rated voltage of the intelligent power distribution cabinet, and ΔU represents the preset normal voltage fluctuation range;

[0067] Furthermore, the voltage stability regulation protection mechanism is specifically as follows:

[0068] Based on the current voltage data U of the intelligent power distribution cabinet current and the preset rated voltage U of the intelligent power distribution cabinet rated , calculate the tap adjustment position of the transformer in the intelligent power distribution cabinet. The calculation formula is as follows:

[0069]

[0070] where ΔTAP represents the tap adjustment position of the transformer in the intelligent power distribution cabinet (usually a floating point number, which needs to be rounded to an integer), and ΔU tap represents the voltage adjustment amplitude per tap of the transformer (set according to standard specifications and industry requirements);

[0071] Based on the tap adjustment position ΔTAP of the transformer in the intelligent power distribution cabinet, perform voltage stability regulation.

[0072] It should be noted that in the formula, U rated is the preset rated voltage of the intelligent power distribution cabinet, that is, the voltage value expected to be achieved after adjusting the transformer tap; U current is the current actual voltage value; ΔUtap is the voltage adjustment amount for each tap of the transformer. By calculating U rated -U current the difference between the current voltage and the target voltage can be obtained. Dividing this difference by ΔU tap the resulting ΔTAP not only reflects the number of tap positions that need to be adjusted but also contains information about the adjustment direction. Specifically, when ΔTAP is greater than 0, it means the current voltage is lower than the target voltage, and the tap position needs to be increased to raise the voltage because increasing the tap position will increase the transformation ratio of the transformer, thereby increasing the output voltage; when ΔTAP is less than 0, it means the current voltage is higher than the target voltage, and the tap position needs to be decreased to lower the voltage. Decreasing the tap position will decrease the transformation ratio of the transformer and lower the output voltage.

[0073] Specifically, the traditional voltage regulation mechanism may trigger adjustments under short-term fluctuations, resulting in unnecessary frequent adjustments and affecting the equipment lifespan; the present invention reduces false triggering situations and improves the regulation accuracy through dual-condition judgment (real-time abnormal voltage ratio + voltage deviation), and directly determines the number of tap positions to be adjusted by calculating ΔTAP. It not only ensures the adjustment accuracy but also can automatically adjust according to the voltage deviation direction to ensure voltage stability. For example, when the voltage of the power distribution cabinet is much lower than the rated voltage, the system will calculate the adjustment amounts for multiple tap positions to ensure that it can be restored to the normal range in one adjustment instead of through multiple small-step adjustments, reducing the number of adjustments and improving the power grid operation efficiency.

[0074] Please refer to Figure 2 , in the second embodiment: A voltage stability regulation and protection system for an intelligent power distribution cabinet is provided. The system includes: a voltage critical time acquisition module, a time set construction and quantity statistics module, a trigger threshold and voltage ratio calculation module, and an analysis and voltage stability regulation module.

[0075] The voltage critical time acquisition module: acquires the voltage critical time in the historical normal working state and the voltage critical time in the historical abnormal working state of the intelligent power distribution cabinet.

[0076] The time set construction and quantity statistics module: based on the voltage critical time, establishes a voltage critical time set in the normal working state of the voltage data and a voltage critical time set in the abnormal working state of the voltage data; divides time intervals and respectively counts the number of voltage critical times in each time interval of the voltage critical time set in the normal working state of the voltage data and the voltage critical time set in the abnormal working state of the voltage data.

[0077] The trigger threshold and voltage ratio calculation module: calculates the voltage regulation trigger threshold for a single time interval based on the number of voltage critical times; obtains the current voltage data and the current voltage critical time, and maps them to the corresponding time interval; counts the number of occurrences of the voltage critical time in the abnormal working state and the normal working state within the current time interval, and calculates the real-time abnormal voltage ratio within the current time interval.

[0078] The analysis and voltage stability regulation module: if the real-time abnormal voltage ratio is greater than the voltage regulation trigger threshold, and the difference between the current voltage data and the rated voltage is greater than the normal voltage fluctuation range, then trigger the voltage stability regulation protection mechanism.

[0079] Furthermore, the voltage critical time acquisition module includes a normal voltage critical time acquisition unit and an abnormal voltage critical time acquisition unit;

[0080] The normal voltage critical time acquisition unit: obtains the voltage data log of the intelligent power distribution cabinet in the historical normal working state during industrial production; according to the voltage data log, extracts the time points corresponding to the maximum and minimum values of the voltage data of the intelligent power distribution cabinet in the historical normal working state, and records the time points as the voltage critical times of the intelligent power distribution cabinet in the normal working state;

[0081] The abnormal voltage critical time acquisition unit: obtains the abnormal voltage data log of the intelligent power distribution cabinet in the historical abnormal working state under power supply interruption; according to the abnormal voltage data log, extracts the time points corresponding to the maximum and minimum values of the abnormal voltage data of the intelligent power distribution cabinet in the historical abnormal working state, and records the time points as the voltage critical times of the intelligent power distribution cabinet in the abnormal working state.

[0082] Furthermore, the time set construction and quantity statistics module includes a time set construction unit and a quantity statistics unit;

[0083] The time set construction unit: establishes a voltage critical time set in the normal working state of the voltage data and a voltage critical time set in the abnormal working state according to the voltage critical times of the intelligent power distribution cabinet in the normal and abnormal working states;

[0084] The quantity statistics unit: evenly divides the time within a day into N time intervals, and counts the number of voltage critical times in each time interval of the voltage critical time set in the normal working state of the voltage data and the number of voltage critical times in each time interval of the voltage critical time set in the abnormal working state of the voltage data.

[0085] Furthermore, the trigger threshold and voltage ratio calculation module includes a trigger threshold calculation unit and a voltage ratio calculation unit;

[0086] The trigger threshold calculation unit: calculates the voltage regulation trigger threshold for a single time interval based on the number of voltage critical times in a single time interval in the voltage critical time set in the normal operating state of the voltage data and the number of voltage critical times in a single time interval in the voltage critical time set in the abnormal operating state of the voltage data;

[0087] The voltage ratio calculation unit: obtains in real time the current voltage data of the intelligent power distribution cabinet and the time points corresponding to the maximum and minimum values of the current voltage data, and maps the time points to the corresponding time intervals; counts the number of occurrences of the voltage critical times in the abnormal operating state and the number of occurrences of the voltage critical times in the normal operating state within the elapsed time in the current time interval, and calculates the real-time abnormal voltage ratio in the current time interval.

[0088] Further, the analysis and voltage stability regulation module includes an analysis unit and a voltage stability regulation unit;

[0089] The analysis unit: based on the real-time abnormal voltage ratio within a single time interval, if the real-time abnormal voltage ratio within a single time interval is greater than the voltage regulation trigger threshold for the single time interval, and the difference between the current voltage data of the intelligent power distribution cabinet and the rated voltage of the preset intelligent power distribution cabinet is greater than the preset normal voltage fluctuation range, then triggers the voltage stability regulation protection mechanism;

[0090] The voltage stability regulation unit: The voltage stability regulation protection mechanism is as follows: based on the current voltage data of the intelligent power distribution cabinet and the preset rated voltage of the intelligent power distribution cabinet, calculates the tap adjustment position of the transformer in the intelligent power distribution cabinet; based on the number of tap adjustment positions of the transformer in the intelligent power distribution cabinet, performs voltage stability regulation.

[0091] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0092] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A voltage stabilization regulation and protection method for an intelligent power distribution cabinet, characterized in that: The method comprises the following steps: Step S1: Obtain the voltage critical time of the intelligent power distribution cabinet in the historical normal working state and the voltage critical time in the historical abnormal working state; Step S2: establishing a voltage critical time set when the voltage data is in a normal working state and a voltage critical time set when the voltage data is in an abnormal working state according to the voltage critical time; dividing the time interval, and respectively counting the number of voltage critical times in each time interval of the voltage critical time set when the voltage data is in a normal working state and the voltage data is in an abnormal working state; Step S3: Based on the number of voltage critical times, calculate the voltage regulation trigger threshold of a single time interval; obtain current voltage data and current voltage critical time, and map them to the corresponding time interval; count the number of times the voltage critical time of abnormal working state and normal working state occurs in the current time interval, and calculate the real-time abnormal voltage ratio in the current time interval; Step S4: If the real-time abnormal voltage ratio is greater than the voltage regulation trigger threshold, and the difference between the current voltage data and the rated voltage is greater than the normal voltage fluctuation range, the voltage stability regulation protection mechanism is triggered.

2. The voltage stabilization regulation and protection method of the intelligent power distribution cabinet according to claim 1 is characterized in that: The specific implementation process of step S1 includes: Obtain a voltage data log of an intelligent power distribution cabinet in industrial production when it is in a historical normal working state; extract the time points corresponding to the maximum and minimum values ​​of the voltage data of the intelligent power distribution cabinet when it is in a historical normal working state according to the voltage data log, and record the time points as the voltage critical time of the intelligent power distribution cabinet when it is in a normal working state; Obtain the abnormal voltage data log of the intelligent distribution cabinet when it is in a historical abnormal working state under power shaking; based on the abnormal voltage data log, extract the time points corresponding to the maximum and minimum values ​​of the abnormal voltage data of the intelligent distribution cabinet in the historical abnormal working state, and record the time points as the voltage critical time of the intelligent distribution cabinet in the abnormal working state.

3. The voltage stabilization regulation and protection method of the intelligent power distribution cabinet according to claim 2 is characterized in that: The specific implementation process of step S2 includes: According to the voltage critical time of the intelligent power distribution cabinet in normal and abnormal working states, a voltage critical time set of voltage data in normal working state and a voltage critical time set in abnormal working state are established, and the voltage critical time set of voltage data in normal working state and the voltage critical time set in abnormal working state are respectively recorded as VCT norm and VCT abn ; Divide the time of a day evenly into N time intervals, and count the voltage critical time set VCT when the voltage data is in normal working state norm The number of voltage critical times in each time interval and the voltage critical time set VCT when the voltage data is in an abnormal working state abn The number of voltage critical times in each time interval; the voltage critical time set VCT when the voltage data is in normal working state norm The voltage critical time set VCT when the voltage data is in abnormal working state abn The number of voltage critical times in the i-th time interval is recorded as N i |VCT norm | and N i |VCT abn |.

4. The voltage stabilization regulation and protection method of the intelligent power distribution cabinet according to claim 3 is characterized in that: The specific implementation process of step S3 includes: Voltage critical time set VCT in normal working state based on voltage data norm The number of voltage critical times N in the i-th time interval i |VCT norm | and voltage critical time set VCT when voltage data is in abnormal working state abn The number of voltage critical times N in the i-th time interval i |VCT abn |, calculate the voltage regulation trigger threshold of the i-th time interval, the calculation formula is as follows: Among them, VRT i represents the voltage regulation trigger threshold of the i-th time interval, α represents the preset abnormal proportion influencing factor, and β represents the preset threshold offset; The current voltage data of the intelligent distribution cabinet and the time points corresponding to the maximum and minimum values ​​of the current voltage data are obtained in real time, and the time points are mapped to the corresponding time intervals; the number of times the voltage critical time of the abnormal working state and the number of times the voltage critical time of the normal working state occur in the elapsed time within the current time interval are counted, and the real-time abnormal voltage ratio within the current time interval is calculated. The calculation formula is as follows: Among them, P i_real represents the proportion of real-time abnormal voltage in the i-th time interval, N i_real |at abn | represents the number of times the voltage critical time of the abnormal working state occurs in real time in the i-th time interval, N i_real |nt norm | represents the number of real-time occurrences of the voltage critical time in the normal working state within the i-th time interval.

5. The voltage stabilization regulation and protection method of the intelligent power distribution cabinet according to claim 4 is characterized in that: The specific implementation process of step S4 includes: Based on the real-time abnormal voltage proportion P in the i-th time interval i_real , if the real-time abnormal voltage in the i-th time interval accounts for P i_real Greater than the voltage regulation trigger threshold VRT of the i-th time interval i , and |U current -U rated |>ΔU, the voltage stabilization regulation protection mechanism is triggered, where U current Indicates the current voltage data of the intelligent power distribution cabinet, U rated Indicates the preset rated voltage of the intelligent power distribution cabinet, and ΔU indicates the preset normal voltage fluctuation range; The voltage stabilization regulation protection mechanism is specifically as follows: Based on the current voltage data U of the intelligent distribution cabinet current And the preset intelligent distribution cabinet rated voltage U rated , calculate the tap adjustment position of the transformer in the intelligent distribution cabinet, the calculation formula is as follows: Among them, ΔTAP represents the number of tap adjustment gears of the transformer in the intelligent distribution cabinet, ΔU tap Indicates the voltage adjustment range of each gear of the transformer; The voltage is regulated stably based on the number of tap adjustment gears ΔTAP of the transformer in the intelligent distribution cabinet.

6. A voltage stabilization regulation and protection system for an intelligent power distribution cabinet, which executes a voltage stabilization regulation and protection method for an intelligent power distribution cabinet as claimed in any one of claims 1 to 5, characterized in that: The system includes: a voltage critical time acquisition module, a time set construction and quantity statistics module, a trigger threshold and voltage proportion calculation module, and an analysis and voltage stability adjustment module; The voltage critical time acquisition module is used to acquire the voltage critical time of the intelligent power distribution cabinet in the historical normal working state and the voltage critical time in the historical abnormal working state; The time set construction and quantity statistics module: according to the voltage critical time, establishes a voltage critical time set when the voltage data is in a normal working state and a voltage critical time set when the voltage data is in an abnormal working state; divides the time interval, and respectively counts the number of voltage critical times in each time interval of the voltage critical time set when the voltage data is in a normal working state and when the voltage data is in an abnormal working state; The trigger threshold and voltage proportion calculation module: calculates the voltage regulation trigger threshold of a single time interval based on the number of voltage critical times; obtains current voltage data and current voltage critical time, and maps them to the corresponding time interval; counts the number of times the voltage critical time of abnormal working state and normal working state occurs in the current time interval, and calculates the real-time abnormal voltage proportion in the current time interval; The analysis and voltage stabilization regulation module: If the real-time abnormal voltage ratio is greater than the voltage regulation trigger threshold, and the difference between the current voltage data and the rated voltage is greater than the normal voltage fluctuation range, the voltage stabilization regulation protection mechanism is triggered.

7. The voltage stabilization regulation and protection system for the intelligent power distribution cabinet according to claim 6 is characterized in that: The voltage critical time acquisition module includes a normal voltage critical time acquisition unit and an abnormal voltage critical time acquisition unit; The normal voltage critical time acquisition unit is used to acquire the voltage data log of the intelligent power distribution cabinet in the industrial production when it is in the historical normal working state; according to the voltage data log, the time points corresponding to the maximum and minimum values ​​of the voltage data of the intelligent power distribution cabinet when it is in the historical normal working state are extracted, and the time points are recorded as the voltage critical time of the intelligent power distribution cabinet when it is in the normal working state; The abnormal voltage critical time acquisition unit: obtains the abnormal voltage data log of the intelligent distribution cabinet when it is in a historical abnormal working state under power shaking; according to the abnormal voltage data log, extracts the time points corresponding to the maximum and minimum values ​​of the abnormal voltage data of the intelligent distribution cabinet in the historical abnormal working state, and records the time points as the voltage critical time of the intelligent distribution cabinet in the abnormal working state.

8. The voltage stabilization regulation and protection system for the intelligent power distribution cabinet according to claim 7 is characterized in that: The time set construction and quantity statistics module includes a time set construction unit and a quantity statistics unit; The time set construction unit: according to the voltage critical time of the intelligent power distribution cabinet in normal and abnormal working states, establishes a voltage critical time set when the voltage data is in a normal working state and a voltage critical time set when the voltage data is in an abnormal working state; The quantity statistics unit is: to evenly divide the time in a day into N time intervals, and to count the number of voltage critical times in each time interval of the voltage critical time set when the voltage data is in a normal working state and the number of voltage critical times in each time interval of the voltage critical time set when the voltage data is in an abnormal working state.

9. The voltage stabilization regulation and protection system for the intelligent power distribution cabinet according to claim 8 is characterized in that: The trigger threshold and voltage proportion calculation module includes a trigger threshold calculation unit and a voltage proportion calculation unit; The trigger threshold calculation unit calculates the voltage regulation trigger threshold for a single time interval based on the number of voltage critical times in a single time interval of a voltage critical time set when the voltage data is in a normal working state and the number of voltage critical times in a single time interval of a voltage critical time set when the voltage data is in an abnormal working state; The voltage proportion calculation unit is used to obtain the current voltage data of the intelligent distribution cabinet and the time points corresponding to the maximum and minimum values ​​of the current voltage data in real time, and map the time points to the corresponding time intervals; The number of times the voltage critical time of the abnormal working state and the number of times the voltage critical time of the normal working state occur in the elapsed time within the current time interval are counted, and the real-time abnormal voltage ratio within the current time interval is calculated.

10. The voltage stabilization regulation and protection system for the intelligent power distribution cabinet according to claim 9, characterized in that: The analysis and voltage stabilization and regulation module comprises an analysis unit and a voltage stabilization and regulation unit; The analysis unit: based on the proportion of real-time abnormal voltage in a single time interval, if the proportion of real-time abnormal voltage in a single time interval is greater than the voltage regulation trigger threshold of a single time interval, and the difference between the current voltage data of the intelligent distribution cabinet and the preset rated power of the intelligent distribution cabinet is greater than the preset normal voltage fluctuation range, then the voltage stability regulation protection mechanism is triggered; The voltage stabilization regulation unit: The voltage stabilization regulation protection mechanism is specifically as follows: based on the current voltage data of the intelligent distribution cabinet and the preset rated voltage of the intelligent distribution cabinet, the tap adjustment gear of the transformer in the intelligent distribution cabinet is calculated; based on the number of tap adjustment gears of the transformer in the intelligent distribution cabinet, voltage stabilization regulation is performed.

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