Voltage stabilization regulation protection method and system for intelligent power distribution cabinet

Abstract

The present invention discloses a voltage stabilization regulation and protection method and system for an intelligent power distribution cabinet, which belongs to the field of regulation and protection technology; establishes a voltage critical time set of the intelligent power distribution cabinet in the historical normal / abnormal working state; divides the time interval, and counts the number of voltage critical times in the voltage critical time set in each time interval; calculates the voltage regulation trigger threshold; obtains the current voltage data and the current voltage critical time, counts the number of voltage critical times in the normal / abnormal working state in the current time interval, and calculates the real-time abnormal voltage ratio; 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. The present invention realizes 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

Technical Field

[0001] The present invention relates to the field of regulation and protection technology, and in particular to a voltage stabilization regulation and protection method and system for an intelligent power distribution cabinet. Background Art

[0002] With the rapid development of industrial automation and smart grid technologies, the application of smart distribution cabinets in power systems is becoming increasingly widespread. In high-reliability scenarios such as industrial production, data centers, and rail transit, voltage stability is crucial to equipment safety and production efficiency. However, due to factors such as grid load fluctuations, power equipment failures, and external interference (such as lightning strikes and short-term power fluctuations), the voltage in the distribution cabinet may fluctuate, and even cause equipment to shut down abnormally. To ensure voltage stability, existing technologies generally adopt voltage protection strategies 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 changes in load characteristics in different time intervals, and is prone to misjudgment or delayed protection. In addition, some technologies use simple time window statistics to analyze abnormal voltage events, but do not fully consider the time distribution characteristics of voltage fluctuations, resulting in low accuracy of the protection mechanism.

[0003] Existing voltage stabilization and regulation technology for intelligent distribution cabinets fails to fully utilize the time series characteristics of historical voltage data, resulting in a lack of flexibility in the setting of protection thresholds and an inability to adapt to voltage change trends in different time intervals. In the process of abnormal voltage identification, it only relies on voltage amplitude judgment without considering the time distribution law of voltage anomalies, which makes it possible 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 fail to dynamically adjust the regulation strategy based on the real-time voltage anomaly ratio, affecting the accuracy of voltage regulation. Summary of the Invention

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

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A voltage stabilization and regulation protection method for an intelligent power distribution cabinet comprises the following steps: step S1: obtaining the voltage critical time of the intelligent power distribution cabinet in historical normal working states and the voltage critical time in historical abnormal working states; step S2: establishing a voltage critical time set for voltage data in normal working states and a voltage critical time set for abnormal working states based on the voltage critical time; dividing the time intervals, and counting the number of voltage critical times in each time interval for the voltage critical time set for voltage data in normal working states and voltage data in abnormal working states respectively; step S3: calculating the voltage regulation trigger threshold of a single time interval based on the number of voltage critical times; obtaining current voltage data and current voltage critical time, and mapping them to corresponding time intervals; counting the number of occurrences of voltage critical times in abnormal working states and normal working states in the current time interval, and calculating 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 stabilization and regulation protection mechanism is triggered.

[0007] As a preferred solution of the voltage stabilization regulation and protection method of the intelligent distribution cabinet described in the present invention, a voltage data log of the intelligent distribution cabinet in industrial production when it is in a historical normal working state is obtained; based on the voltage data log, the time points corresponding to the maximum and minimum values ​​of the voltage data of the intelligent distribution cabinet when it is in a historical normal working state are extracted, and the time points are recorded as the voltage critical time of the intelligent distribution cabinet when it is in a normal working state.

[0008] 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.

[0009] As a preferred solution of the voltage stability regulation and protection method of the intelligent distribution cabinet of the present invention, according to the voltage critical time of the intelligent 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 .

[0010] Divide the time of a day into N time intervals evenly, and calculate the voltage critical time set VCT when the voltage data is in normal working state. normThe 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 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 |.

[0011] As a preferred solution of the voltage stability regulation protection method of the intelligent distribution cabinet of the present invention, the voltage critical time set VCT under normal working state of the voltage data is used. norm The number of voltage critical times N in the i-th time interval i |VCT norm Voltage critical time set VCT when the 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 in the i-th time interval, the calculation formula is as follows:

[0012]

[0013] Among them, VRT i represents the voltage regulation trigger threshold in the i-th time interval, α represents the preset abnormality ratio influencing factor, and β represents the preset threshold offset.

[0014] It should be noted that the It 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 abnormal voltage conditions occur within the time interval, which means that the more unstable the voltage state is, the more necessary it is to trigger regulation. The introduction of a preset abnormal proportion influencing factor α and a 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 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 conditions such as the importance of the distribution cabinet and load characteristics. For example, for the distribution cabinet of important equipment, β can be appropriately increased to make it easier to trigger regulation protection.

[0015] 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:

[0016]

[0017] 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 real-time occurrences of the voltage critical time of 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 within the i-th time interval.

[0018] As a preferred solution of the voltage stabilization regulation and protection method of the intelligent distribution cabinet of the present invention, 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 in 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 distribution cabinet, U rated Indicates the preset rated voltage of the intelligent distribution cabinet, and ΔU indicates the preset normal voltage fluctuation range.

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

[0020] 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:

[0021]

[0022] Among them, ΔTAP represents the number of tap adjustment gears of the transformer in the intelligent distribution cabinet (usually a floating point number that needs to be rounded off), ΔU tap Indicates the voltage adjustment range of each gear of the transformer (set according to standards and industry requirements).

[0023] Voltage stability is regulated based on the number of tap adjustment gears ΔTAP of the transformer in the intelligent distribution cabinet.

[0024] It should be noted that U in the formula rated It is the preset rated voltage of the intelligent distribution cabinet, that is, the voltage value expected to be achieved after adjusting the transformer tap; U current is the actual current voltage value; ΔU tap It is the voltage regulation of each level of transformer tap. rated -U current The difference between the current voltage and the target voltage can be obtained. This difference is divided by ΔU tap The obtained ΔTAP not only reflects the number of gears that need to be adjusted for the tap changer, but also contains information about the direction of adjustment. Specifically, when ΔTAP is greater than 0, it means that the current voltage is lower than the target voltage and the tap changer gear needs to be increased to increase the voltage. This is because increasing the tap changer gear will increase the transformer ratio, 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 changer gear needs to be lowered to reduce the voltage. Lowering the tap changer gear will reduce the transformer ratio and reduce the output voltage.

[0025] The voltage stability regulation and protection system of the intelligent distribution cabinet 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 regulation module.

[0026] 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.

[0027] The time set construction and quantity statistics module: 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 according to the voltage critical time; divides the time interval and 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.

[0028] 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.

[0029] 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.

[0030] Furthermore, 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 is configured to obtain a voltage data log of an intelligent power distribution cabinet in industrial production when in a historical normal working state; extract, based on 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 in a historical normal working state, and record the time points as the voltage critical time of the intelligent power distribution cabinet when in a normal working state;

[0032] 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.

[0033] Furthermore, 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 is configured to establish a voltage critical time set for the normal working state and a voltage critical time set for the abnormal working state of the voltage data according to the voltage critical time of the intelligent power distribution cabinet in the normal and abnormal working states;

[0035] The quantity statistics unit is: configured to evenly divide the time within 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.

[0036] Furthermore, the trigger threshold and voltage proportion calculation module includes a trigger threshold calculation unit and a voltage proportion calculation unit;

[0037] The trigger threshold calculation unit calculates the voltage regulation trigger threshold for a single time interval based on the number of voltage critical time periods in a single time interval of the voltage critical time set when the voltage data is in a normal working state and the number of voltage critical time periods in a single time interval of the voltage critical time set when the voltage data is in an abnormal working state;

[0038] The voltage proportion calculation unit: obtains 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 maps the time points to the corresponding time intervals; counts 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 time that has passed within the current time interval, and calculates the real-time abnormal voltage proportion within the current time interval.

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

[0040] The analysis unit: based on the real-time abnormal voltage ratio in a single time interval, if the real-time abnormal voltage ratio 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;

[0041] The voltage stabilization and regulation unit: The voltage stabilization and 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.

[0042] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: in the voltage stability regulation and protection method and system of the intelligent distribution cabinet provided by the present invention, by obtaining the voltage critical time of the intelligent distribution cabinet under historical normal and abnormal working conditions, a voltage state benchmark data is established to provide a historical basis for subsequent analysis; according to the voltage critical time data set, the time interval is divided, the voltage abnormality frequency in different intervals is counted, and the voltage fluctuation characteristics are accurately quantified from the time dimension, laying the foundation for dynamic threshold setting; based on the abnormal voltage ratio, the voltage regulation trigger threshold is calculated, and the abnormal voltage ratio in the current time interval is counted in real time, thereby realizing rapid identification of abnormal voltage conditions and improving the timeliness of response; when the real-time abnormal voltage ratio exceeds the threshold and the voltage deviation exceeds the normal fluctuation range, the voltage stability regulation protection mechanism is triggered, and the transformer tap is adjusted according to the calculated gear to accurately adjust the voltage to ensure the stability and safety of the power system. Overall, the present invention realizes precise voltage regulation of the intelligent distribution cabinet by combining historical data, real-time monitoring and adaptive regulation, and improves the safety, reliability and adaptability of the power grid system. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0045] Figure 2 It is a structural diagram of the voltage stabilization regulation and protection system of the intelligent power distribution cabinet of the present invention. DETAILED DESCRIPTION

[0046] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] See also Figure 1 In the first embodiment, a voltage stabilization and regulation protection method for an intelligent power distribution cabinet is provided, the method comprising the following steps:

[0048] 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.

[0049] Specifically, obtain the voltage data log of the intelligent distribution cabinet in industrial production when it is in a historical normal working state; based on the voltage data log, extract the time points corresponding to the maximum and minimum values ​​of the voltage data of the intelligent distribution cabinet when it is in a historical normal working state, and record the time points as the voltage critical time of the intelligent distribution cabinet when it is in a normal working state.

[0050] Furthermore, 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.

[0051] It should be noted that existing voltage stability monitoring technology mainly focuses on the fluctuation range of voltage values, but ignores its distribution pattern on the time axis. The introduction of the concept of voltage critical time enables the system to analyze the voltage status based on time series data, rather than relying solely on numerical judgment. This can more accurately identify the pattern of voltage fluctuations and avoid misjudging the equipment status due to short-term voltage anomalies.

[0052] Step S2: Based on the voltage critical time, establish 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; divide the time intervals, and 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 when the voltage data is in an abnormal working state.

[0053] Specifically, according to the voltage critical time of the intelligent 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 .

[0054] Furthermore, the time in a day is evenly divided into N time intervals, and the voltage critical time set VCT when the voltage data is in normal working state is statistically analyzed. 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 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 |.

[0055] It should be noted that traditional methods mostly use a single time window for voltage fluctuation analysis and are unable to identify the periodic characteristics of abnormal voltage. This method can discover the time-varying characteristics of the grid load by counting the frequency of abnormal voltage in different time intervals. For example, during the peak period of industrial power load, voltage fluctuations may be more frequent, so reasonable time interval division can improve the regulation accuracy.

[0056] Step S3: Based on the number of voltage critical times, calculate the voltage regulation trigger threshold of 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 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.

[0057] Specifically, based on the voltage critical time set VCT in the normal working state of the 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 in the i-th time interval, the calculation formula is as follows:

[0058]

[0059] Among them, VRT i represents the voltage regulation trigger threshold of the i-th time interval, α represents the preset abnormality ratio influencing factor, and β represents the preset threshold offset;

[0060] It should be noted that the It 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 abnormal voltage conditions occur within the time interval, which means that the more unstable the voltage state is, the more necessary it is to trigger regulation. The introduction of a preset abnormal proportion influencing factor α and a 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 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 conditions such as the importance of the distribution cabinet and load characteristics. For example, for the distribution cabinet of important equipment, β can be appropriately increased to make it easier to trigger regulation protection.

[0061] Furthermore, 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 time that has passed in the current time interval are counted, and the real-time abnormal voltage ratio in the current time interval is calculated. The calculation formula is as follows:

[0062]

[0063] 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 real-time occurrences of the voltage critical time of 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 within the i-th time interval.

[0064] It should be noted that most existing methods use fixed thresholds to trigger voltage regulation, which cannot adapt to load fluctuations in different time periods. The present invention uses time interval division and dynamic calculation to enable the threshold to adapt to different operating states; for example, when the industrial load is low at night, even if there are large voltage fluctuations, regulation may not be triggered. During high-load operation during the day, the requirements for voltage stability are higher, and the system can be adjusted 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, the voltage stabilization regulation protection mechanism is triggered.

[0066] Specifically, 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 in 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 distribution cabinet, U rated Indicates the preset rated voltage of the intelligent distribution cabinet, and ΔU indicates the preset normal voltage fluctuation range;

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

[0068] 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:

[0069]

[0070] Among them, ΔTAP represents the number of tap adjustment gears of the transformer in the intelligent distribution cabinet (usually a floating point number that needs to be rounded off), ΔU tap Indicates the voltage adjustment range of each gear of the transformer (set according to standards and industry requirements);

[0071] Voltage stability is regulated based on the number of tap adjustment gears ΔTAP of the transformer in the intelligent distribution cabinet.

[0072] It should be noted that U in the formula rated It is the preset rated voltage of the intelligent distribution cabinet, that is, the voltage value expected to be achieved after adjusting the transformer tap; U current is the actual current voltage value; ΔUtap It is the voltage regulation of each level of transformer tap. rated -U current The difference between the current voltage and the target voltage can be obtained. This difference is divided by ΔU tap The obtained ΔTAP not only reflects the number of gears that need to be adjusted for the tap changer, but also contains information about the direction of adjustment. Specifically, when ΔTAP is greater than 0, it means that the current voltage is lower than the target voltage and the tap changer gear needs to be increased to increase the voltage. This is because increasing the tap changer gear will increase the transformer ratio, 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 changer gear needs to be lowered to reduce the voltage. Lowering the tap changer gear will reduce the transformer ratio and reduce 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 life of the equipment; the present invention reduces false triggering and improves the accuracy of regulation through dual-condition judgment (real-time abnormal voltage proportion + voltage deviation), and directly determines the number of gears that need to be adjusted by calculating ΔTAP, which not only ensures the adjustment accuracy, but also can automatically adjust according to the direction of voltage deviation to ensure voltage stability; for example, when the voltage of the distribution cabinet is far lower than the rated voltage, the system will calculate the adjustment amount of multiple gears to ensure that it can be restored to the normal range with one adjustment, rather than through multiple small-step adjustments, reducing the number of adjustments and improving the operation efficiency of the power grid.

[0074] See also Figure 2 In the second embodiment of the present invention, a voltage stability regulation and protection system for an intelligent distribution cabinet is provided, which 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 regulation module.

[0075] 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.

[0076] The time set construction and quantity statistics module: 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 according to the voltage critical time; divides the time interval and 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.

[0077] 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.

[0078] 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.

[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 is configured to obtain a voltage data log of an intelligent power distribution cabinet in industrial production when in a historical normal working state; extract, based on 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 in a historical normal working state, and record the time points as the voltage critical time of the intelligent power distribution cabinet when in a normal working state;

[0081] 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.

[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 is configured to establish a voltage critical time set for the normal working state and a voltage critical time set for the abnormal working state of the voltage data according to the voltage critical time of the intelligent power distribution cabinet in the normal and abnormal working states;

[0084] The quantity statistics unit is: configured to evenly divide the time within 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.

[0085] Furthermore, the trigger threshold and voltage proportion calculation module includes a trigger threshold calculation unit and a voltage proportion 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 time periods in a single time interval of the voltage critical time set when the voltage data is in a normal working state and the number of voltage critical time periods in a single time interval of the voltage critical time set when the voltage data is in an abnormal working state;

[0087] The voltage proportion calculation unit: obtains 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 maps the time points to the corresponding time intervals; counts 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 time that has passed within the current time interval, and calculates the real-time abnormal voltage proportion within the current time interval.

[0088] Furthermore, the analysis and voltage stabilization and regulation module includes an analysis unit and a voltage stabilization and regulation unit;

[0089] The analysis unit: based on the real-time abnormal voltage ratio in a single time interval, if the real-time abnormal voltage ratio 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;

[0090] The voltage stabilization and regulation unit: The voltage stabilization and 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.

[0091] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0092] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A voltage stabilization and regulation 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 for a normal working state of the voltage data and a voltage critical time set for an abnormal working state according to the voltage critical time; dividing the time intervals, and counting the number of voltage critical times in each time interval of the voltage critical time set for the normal working state of the voltage data and the voltage critical time set for the abnormal working state of the voltage data; Step S3: Based on the number of voltage critical times, calculate the voltage regulation trigger threshold for 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 voltage critical times in abnormal working state and 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, the voltage stabilization regulation protection mechanism is triggered; 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 based on 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 abnormal voltage data logs of the intelligent distribution cabinet when it is in a historical abnormal working state under power shaking; based on the abnormal voltage data logs, 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; The specific implementation process of step S2 includes: According to the voltage critical time of the intelligent 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 into N time intervals evenly, and calculate 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 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 |; The specific implementation process of step S3 includes: Voltage critical time set VCT under 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 in 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 abnormality ratio 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 real-time occurrences of the voltage critical time of 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 within the i-th time interval.

2. The voltage stabilization regulation and protection method of the intelligent power distribution cabinet according to claim 1, 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 in 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 distribution cabinet, U rated Indicates the preset rated voltage of the intelligent distribution cabinet, and ΔU indicates the preset normal voltage fluctuation range; The voltage stabilization and 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; Voltage stability is regulated based on the number of tap adjustment gears ΔTAP of the transformer in the intelligent distribution cabinet.

3. A voltage stabilization and regulation protection system for an intelligent power distribution cabinet, which executes the voltage stabilization and regulation protection method for an intelligent power distribution cabinet according to any one of claims 1 to 2, 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: 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 according to the voltage critical time; divides the time interval and 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 voltage critical times of abnormal working state and normal working state 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.

4. The voltage stabilization regulation and protection system for an intelligent power distribution cabinet according to claim 3 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 configured to obtain a voltage data log of an intelligent power distribution cabinet in industrial production when in a historical normal working state; extract, based on 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 in a historical normal working state, and record the time points as the voltage critical time of the intelligent power distribution cabinet when in a 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.

5. The voltage stabilization regulation and protection system for an intelligent power distribution cabinet according to claim 4 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 is configured to establish a voltage critical time set for the normal working state and a voltage critical time set for the abnormal working state of the voltage data according to the voltage critical time of the intelligent power distribution cabinet in the normal and abnormal working states; The quantity statistics unit is: configured to evenly divide the time within 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.

6. The voltage stabilization regulation and protection system for an intelligent power distribution cabinet according to claim 5, 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 time periods in a single time interval of the voltage critical time set when the voltage data is in a normal working state and the number of voltage critical time periods in a single time interval of the 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 corresponding time intervals; The number of times the voltage critical time of the abnormal working state occurs 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 in the current time interval is calculated.

7. The voltage stabilization regulation and protection system for an intelligent power distribution cabinet according to claim 6, characterized in that: The analysis and voltage stabilization and regulation module includes an analysis unit and a voltage stabilization and regulation unit; The analysis unit: based on the real-time abnormal voltage ratio in a single time interval, if the real-time abnormal voltage ratio 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 and regulation unit: The voltage stabilization and 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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