Intelligent on-load tap changer control method and system, device, and medium

Abstract

The application provides a smart on-load voltage regulating switch control method and system, equipment and medium, and belongs to the technical field of intelligent control. The method comprises the following steps: acquiring voltage sequences of a primary side and a secondary side of a transformer. A voltage deviation is calculated according to the secondary side voltage sequence and a voltage target value. If the deviation exceeds a first difference threshold value, voltage reduction is required, and if the deviation is lower than a second difference threshold value, voltage increase is required. If the deviation is between the two threshold values, the primary side voltage sequence and the secondary side voltage sequence are combined to determine whether voltage increase, voltage reduction or no voltage regulating demand is required. If voltage regulating is required, fault judgment is performed according to vacuum bubble insulation data and switch temperature, and if there is no fault, overload judgment is performed according to switch working current. If there is no overload, target voltage regulating parameters are determined according to the voltage deviation, initial tapping position, voltage regulating demand, load data and working current, and the switch position is controlled according to the target voltage regulating parameters. The application can realize intelligent and safe control of the on-load voltage regulating switch.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of intelligent control, and more particularly relates to an intelligent on-load voltage regulating switch control method and system, equipment and a medium. BACKGROUND

[0002] In a power system, a distribution transformer is a core device for realizing voltage conversion and power distribution, and an on-load voltage regulating switch, as a key component of the distribution transformer, can regulate output voltage by switching a tap winding under a load operation state of the transformer, so as to ensure that a secondary side load obtains stable power supply voltage, and the operation reliability thereof directly affects power supply quality and equipment safety of the power system.

[0003] With diversified development of power loads, load fluctuation faced by the distribution transformer is increasingly frequent, and primary side grid voltage is often unstable due to factors such as regional peak power consumption and line loss, which puts forward higher requirements for accurate control and safe operation of the on-load voltage regulating switch. The existing on-load voltage regulating switch control technology only relies on secondary side voltage deviation to determine voltage regulating demand, which is prone to cause invalid voltage regulation or excessive voltage regulation due to misjudgment of fluctuation sources, and increases mechanical loss of the switch. In addition, there are safety hazards in the voltage regulating process, and it is difficult to meet the control requirements of the power system on high reliability and high accuracy of the on-load voltage regulating switch. SUMMARY

[0004] The application aims to provide an intelligent on-load voltage regulating switch control method and system, equipment and a medium, so as to realize intelligent and safe control of the on-load voltage regulating switch.

[0005] In a first aspect, an intelligent on-load voltage regulating switch control method is provided, which comprises the following steps.

[0006] A primary side grid voltage sequence and a secondary side load voltage sequence of a transformer are obtained.

[0007] A voltage deviation is calculated based on the secondary side load voltage sequence and a secondary side voltage target value. If the voltage deviation is greater than a first difference threshold, it is determined that voltage regulating demand is voltage reduction. If the voltage deviation is less than a second difference threshold, it is determined that the voltage regulating demand is voltage increase. If the voltage deviation is greater than or equal to the second difference threshold and less than or equal to the first difference threshold, the voltage regulating demand is obtained based on the primary side grid voltage sequence and the secondary side load voltage sequence. The voltage regulating demand includes any one of voltage increase, voltage reduction or no voltage regulating demand.

[0008] If the voltage regulation demand is any one of the voltage up-regulation and the voltage down-regulation, the voltage regulation switch temperature of the voltage regulation switch and insulation data of the vacuum bulb are obtained; fault determination is performed on the insulation data of the vacuum bulb and the voltage regulation switch temperature to obtain a fault determination result; the vacuum bulb is used to perform vacuum arc extinguishing on an electric arc generated when the contact of the voltage regulation switch acts; if the fault determination result is no fault, the switch working current of the voltage regulation switch is obtained, and overload determination is performed on the switch working current to obtain an overload determination result;

[0009] If the overload determination result is no overload, the load data of the transformer and the initial tapping position of the voltage regulation switch are obtained; the target voltage regulation parameter is determined based on the voltage deviation, the initial tapping position, the voltage regulation demand, the load data of the transformer and the switch working current; and the voltage regulation switch is controlled to switch the position based on the target voltage regulation parameter.

[0010] In a second aspect, the embodiment of the application provides a control system of an intelligent on-load voltage regulation switch, comprising:

[0011] The data acquisition module is configured to obtain a primary side power grid voltage sequence and a secondary side load voltage sequence of the transformer.

[0012] The voltage regulation demand analysis module is configured to calculate a voltage deviation based on the secondary side load voltage sequence and a secondary side voltage target value; if the voltage deviation is greater than a first difference threshold, it is determined that the voltage regulation demand is the voltage down-regulation; if the voltage deviation is less than a second difference threshold, it is determined that the voltage regulation demand is the voltage up-regulation; if the voltage deviation is greater than or equal to the second difference threshold and less than or equal to the first difference threshold, the voltage regulation demand is obtained based on the primary side power grid voltage sequence and the secondary side load voltage sequence; and the voltage regulation demand includes any one of the voltage up-regulation, the voltage down-regulation or no voltage regulation demand.

[0013] The safety determination module is configured to, if the voltage regulation demand is any one of the voltage up-regulation and the voltage down-regulation, obtain the switch working current of the voltage regulation switch, the voltage regulation switch temperature and the insulation data of the vacuum bulb; perform fault determination on the insulation data of the vacuum bulb and the voltage regulation switch temperature to obtain a fault determination result; the vacuum bulb is used to perform vacuum arc extinguishing on an electric arc generated when the contact of the voltage regulation switch acts; if the fault determination result is no fault, perform overload determination on the switch working current to obtain an overload determination result.

[0014] The voltage regulation control module is configured to, if the overload determination result is no overload, obtain the load data of the transformer and the initial tapping position of the voltage regulation switch; determine the target voltage regulation parameter based on the voltage deviation, the initial tapping position, the voltage regulation demand, the load data of the transformer and the switch working current; and control the voltage regulation switch to switch the position based on the target voltage regulation parameter.

[0015] In a third aspect, the embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor implements the steps of the intelligent on-load tap changer control method when running the computer program.

[0016] In a fourth aspect, the embodiment of the present application provides a computer readable storage medium, which stores a computer program, and the computer program implements the steps of the intelligent on-load tap changer control method when executed by a processor.

[0017] The intelligent on-load tap changer control method and system, the device and the medium provided by the embodiment of the present application have the following beneficial effects:

[0018] The embodiment of the present application can accurately distinguish the root cause of the voltage deviation through the preliminary judgment of the secondary side voltage deviation and the joint verification of the primary side power grid voltage and the secondary side load voltage, and if the secondary side voltage deviation is within a reasonable range (between the second difference threshold and the first difference threshold), further determination is needed in combination with the primary side power grid voltage fluctuation to determine whether to adjust the voltage, so as to avoid invalid voltage adjustment or excessive voltage adjustment caused by single parameter misjudgment, significantly reduce the mechanical wear of the switch, and prolong the service life of the device.

[0019] After determining the voltage adjustment requirement, the embodiment of the present application first performs fault determination on the vacuum bubble insulation data (to ensure arc extinguishing safety) and the temperature of the tap changer (to avoid high temperature failure), and then performs overload determination on the working current of the switch, and only when there is no fault and no overload, the voltage adjustment (i.e. switch gear position switching) is performed, so as to exclude safety hazards, prevent device damage caused by insulation failure, excessive temperature or current overload, and ensure the safe operation of the on-load tap changer and the distribution transformer.

[0020] When determining the target voltage adjustment parameter, the embodiment of the present application comprehensively considers the voltage deviation, the initial tap position, the load data and the working current of the switch, ensures that the voltage adjustment parameter is accurately matched with the actual load requirement and the device operation state, avoids excessive or insufficient voltage adjustment caused by single parameter, and ensures that the secondary side load always obtains stable voltage, meets the reliable power supply requirement of multiple scenarios, and indirectly improves the power supply quality of the entire power system. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1A flowchart of a control method of an intelligent on-load voltage regulating switch according to an embodiment of the present application is provided.

[0023] Figure 2 A gear switching diagram of a common no-load switch and an on-load voltage regulating switch according to an embodiment of the present application is provided.

[0024] Figure 3 A front view of an on-load voltage regulating switch according to an embodiment of the present application is provided.

[0025] Figure 4 A back view of an on-load voltage regulating switch according to an embodiment of the present application is provided.

[0026] Figure 5 A structural block diagram of a control system of an intelligent on-load voltage regulating switch according to an embodiment of the present application is provided.

[0027] Figure 6 A schematic block diagram of an electronic device according to an embodiment of the present application is provided. DETAILED DESCRIPTION

[0028] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons having ordinary skill in the art will readily recognize that embodiments of the application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and processes have not been described in detail so as not to unnecessarily obscure aspects of the application.

[0029] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be described in detail with reference to the accompanying drawings.

[0030] Reference will be made to Figure 1 , Figure 1 A flowchart of a control method of an intelligent on-load voltage regulating switch according to an embodiment of the present application is provided. The method can be executed by an electronic device, and specifically, the method can include S101-S104.

[0031] S101: Obtain a primary side grid voltage sequence and a secondary side load voltage sequence of a transformer.

[0032] In the present embodiment, the voltage deviation is calculated based on the secondary side load voltage sequence and a secondary side voltage target value, specifically including: calculating a secondary side load voltage mean value based on the secondary side load voltage sequence; calculating a difference between the secondary side load voltage mean value and the secondary side voltage target value, and taking the difference as the voltage deviation.

[0033] S102: Calculate the voltage deviation based on the secondary side load voltage sequence and the secondary side voltage target value; if the voltage deviation is greater than the first difference threshold, determine the voltage regulation requirement as voltage reduction; if the voltage deviation is less than the second difference threshold, determine the voltage regulation requirement as voltage increase; if the voltage deviation is greater than or equal to the second difference threshold and less than or equal to the first difference threshold, obtain the voltage regulation requirement based on the primary side grid voltage sequence and the secondary side load voltage sequence; the voltage regulation requirement includes any one of voltage increase, voltage reduction or no voltage regulation requirement.

[0034] In the embodiment, the primary side grid voltage sequence refers to a set of transformer primary side input end grid voltage data collected continuously, containing primary side voltage values at different time points in the first time period. The secondary side load voltage sequence refers to a set of transformer secondary side output end load side voltage data collected continuously synchronously with the primary side grid voltage sequence, containing secondary side voltage values at different time points in the first time period.

[0035] The voltage deviation refers to the difference between the secondary side load voltage mean value and the secondary side voltage target value, containing the deviation numerical value size and the deviation positive direction, the positive deviation indicating that the secondary side load voltage mean value is high, and the negative deviation indicating that the secondary side load voltage mean value is low. The first difference threshold is a voltage deviation critical value for determining whether voltage reduction is needed. The second difference threshold is a voltage deviation critical value for determining whether voltage increase is needed. The secondary side load voltage mean value is an average voltage value calculated based on the secondary side load voltage sequence.

[0036] Considering that the secondary side voltage is directly related to the load power supply quality, taking this as the core to determine the voltage regulation requirement is more in line with the actual power supply target. The embodiment first determines the voltage deviation based on the difference between the secondary side load voltage mean value and the target value, and sets the first difference threshold and the second difference threshold, so that the two thresholds can quickly determine the scene that obviously needs to increase or reduce the voltage, and improve the judgment efficiency. When the deviation is between the two thresholds, in order to avoid misjudgment of the fluctuation source (such as grid side or load side fluctuation) only according to the secondary side data, ensure the accuracy of the voltage regulation requirement determination, the embodiment further analyzes and determines the voltage regulation requirement in combination with the primary side and secondary side voltage sequences, which prevents invalid voltage regulation from increasing switch loss, and avoids missing necessary voltage regulation operation to affect power supply stability, and balances efficiency and accuracy.

[0037] For example, the transformer can be a three-phase oil-immersed on-load voltage regulation distribution transformer. Taking a 10 kV three-phase oil-immersed on-load voltage regulation distribution transformer with a secondary side rated voltage of 220 V and a secondary side voltage target value of 220 V as an example, according to the power supply requirements, the first difference threshold value of the embodiment can be set to +4.4 V, corresponding to +2% of the secondary side rated voltage; the second difference threshold value of the embodiment can be set to -4.4 V, corresponding to -2% of the secondary side rated voltage, and the calculation time window of the secondary side load voltage average is set to 1 minute. The embodiment can obtain the primary side grid voltage sequence and the secondary side load voltage sequence through the voltage sensors pre-installed on the primary side and the secondary side of the transformer, respectively. For example, the embodiment can collect the secondary side load voltage through the voltage sensor at the output end of the secondary side at a frequency of 1 second / time to form a secondary side load voltage sequence; the embodiment can extract 60 voltage data in the last 1 minute from the secondary side load voltage sequence, calculate the arithmetic mean value, and assume that the arithmetic mean value of the secondary side load voltage is 220.5 V.

[0038] The embodiment can subtract the secondary side load voltage average 220.5 V from the secondary side voltage target value 220 V to obtain a voltage deviation of +0.5 V. Since +0.5 V is greater than the second difference threshold value -4.4 V and less than the first difference threshold value +4.4 V, the embodiment can retrieve the synchronously collected primary side grid voltage sequence, and further analyze the fluctuation source in combination with the secondary side load voltage sequence. If the primary side voltage is stable and the secondary side voltage has no persistent deviation trend, it is finally determined that the voltage regulation requirement is no voltage regulation requirement; if the primary side voltage shows a persistent upward trend and the secondary side voltage average also shows a persistent upward trend, it is determined that the voltage regulation requirement is voltage reduction. If the primary side voltage is stable but the secondary side voltage shows a persistent downward trend, or the primary side voltage shows a persistent downward trend and the secondary side voltage average also shows a persistent downward trend, it is determined that the voltage regulation requirement is voltage increase.

[0039] S103: If the voltage regulation requirement is any one of voltage increase and voltage reduction, the voltage regulation switch temperature of the voltage regulation switch and the insulation data of the vacuum bulb are obtained; the insulation data of the vacuum bulb and the voltage regulation switch temperature are subjected to fault determination to obtain a fault determination result; the vacuum bulb is used to extinguish the arc generated when the contact of the voltage regulation switch acts; if the fault determination result is no fault, the switch working current of the voltage regulation switch is obtained, and the switch working current is subjected to overload determination to obtain an overload determination result.

[0040] In the embodiment, the intelligent on-load voltage regulation switch control method further includes: if the voltage regulation requirement is no voltage regulation requirement, the voltage regulation switch gear shifting operation is not triggered, and the embodiment can continue to monitor the primary side grid voltage sequence, the secondary side load voltage sequence and other data in real time according to the preset initial monitoring frequency, and then determine when the subsequent data meet the voltage regulation triggering condition.

[0041] In this embodiment, the switch operating current of the voltage regulating switch refers to the current data during the operation of the voltage regulating switch, including the real-time operating current value. The voltage regulating switch temperature refers to the temperature data during the operation of the voltage regulating switch, including the temperature of the key components of the switch body, such as the temperature of the contacts or the coil. The insulation data of the vacuum bubble refers to the data reflecting the insulation performance of the vacuum bubble, which can include the insulation resistance value between the two ends of the vacuum bubble. The fault determination refers to the judgment process of whether the insulation data of the vacuum bubble and the temperature of the voltage regulating switch meet the safe operation requirements. The fault determination result refers to the conclusion obtained after the fault determination, including two categories of no fault (vacuum bubble insulation qualified and normal temperature) and fault (vacuum bubble insulation deterioration or temperature overrun). The overload determination refers to the judgment process of whether the switch operating current exceeds the rated operating range. The overload determination result refers to the conclusion obtained after the overload determination, including two categories of no overload (operating current within the rated range) and overload (operating current exceeding the rated range).

[0042] In this embodiment, the switch operating current and the voltage regulating switch temperature can reflect the operating load and working condition of the equipment, providing a basis for determining whether the voltage regulating condition is met. The insulation data of the vacuum bubble is directly related to the arc extinguishing safety during voltage regulation, and can help to identify potential fault risks in advance. Considering that the vacuum bubble is the core component for arc extinguishing, poor insulation can cause arc during voltage regulation, leading to safety accidents, and temperature overrun can damage the switch components, this embodiment first determines the fault of the vacuum bubble insulation data and the voltage regulating switch temperature, and only when there is no fault, the overload determination is performed, which can avoid unnecessary overload detection and improve efficiency. It not only prioritizes the intrinsic safety of voltage regulation operation to prevent arc extinguishing failure and component damage, but also avoids executing voltage regulation under overload conditions to aggravate the equipment burden, ensuring safe voltage regulation and reducing fault risks.

[0043] For example, after determining that the voltage regulation requirement is voltage increase or voltage decrease, this embodiment can first obtain the to-be-determined data, including: the insulation resistance value between the two ends of the vacuum bubble measured last time, the real-time voltage regulating switch temperature data, the preset vacuum bubble insulation resistance safety threshold (such as 1000MΩ), and the voltage regulating switch key component temperature safety threshold (such as temperature ≤80℃). The voltage regulating switch temperature can be obtained through the temperature sensor pre-installed on the key components of the switch, and the vacuum bubble insulation resistance value can be measured periodically by the vacuum bubble insulation resistance test equipment.

[0044] This embodiment can compare the vacuum bubble insulation resistance value with the safety threshold. If the vacuum bubble insulation resistance value exceeds 1000MΩ, it is determined that the insulation is qualified, otherwise it is determined that the insulation is deteriorated. The voltage regulating switch temperature is compared with the corresponding temperature threshold. If the temperature threshold is not exceeded, it is determined that the temperature is normal, otherwise it is determined that the temperature is overrun. If the insulation is qualified and the temperature is normal, the fault determination result is no fault. If the insulation is deteriorated or the temperature is overrun, the determination result is fault, and the voltage regulation is suspended and a fault alarm is issued.

[0045] Specifically, for vacuum bubble insulation deterioration failure, the embodiment can suspend all operations of the voltage regulating switch, disconnect the voltage regulating switch from the power grid, trigger an audible and light alarm, and push the failure information to the on-duty personnel's mobile phone APP and the monitoring center through the operation and maintenance system, and clearly mark that the vacuum bubble needs to be replaced urgently.

[0046] For temperature overrun failure, the embodiment can perform temperature positioning and cause investigation to determine the overrun component and the specific temperature value; the embodiment can scan the switch body by an infrared thermal imager to locate the high temperature point and investigate whether the overrun is caused by poor contact of the contact, inter-turn short circuit of the coil, or failure of the cooling fan. If it is poor contact of the contact, the transformer load power is temporarily reduced to reduce the current passing through the contact; if it is insufficient cooling, a standby cooling fan can be started or a temporary industrial fan is placed around the switch body to accelerate heat dissipation, and the temperature change is monitored in real time until it drops below the safety threshold.

[0047] The embodiment can perform overload determination when there is no failure, first acquire the switch working current through the Hall current sensor pre-installed in the voltage regulating switch power supply circuit, compare the real-time working current of the voltage regulating switch with the rated working current (such as 50A), if it does not exceed 50A, the overload determination result is no overload, and the voltage regulating operation is allowed to continue; if it exceeds 50A, it is overload, the voltage regulating is suspended and an overload alarm is issued, and after the current returns to normal, the determination is re-determined.

[0048] S104: If the overload determination result is no overload, acquire the load data of the transformer and the initial tapping position of the voltage regulating switch; determine the target voltage regulating parameter based on the voltage deviation, the initial tapping position, the voltage regulating demand, the load data of the transformer, and the switch working current; control the voltage regulating switch to switch the position based on the target voltage regulating parameter.

[0049] In the embodiment, the load data of the transformer refers to data reflecting the load condition of the transformer, which can include load power, load type, and load change rate, etc. The initial tapping position refers to the tapping winding position of the voltage regulating switch before starting the voltage regulating operation, which includes the current position number. The target voltage regulating parameter refers to a set of key parameters for controlling the voltage regulating switch to complete the position switching, which can include the target tapping position, the position switching interval time, and the switching action duration, etc. The target voltage regulating parameter is an operation basis calculated based on multi-dimensional operation data, which can be obtained based on the voltage deviation size, the initial tapping position, the load data characteristics, and the switch working current level. The position switching refers to the action process of the voltage regulating switch switching from the initial tapping position to the target tapping position under the action of the driving mechanism, which is used to represent the specific behavior of the voltage regulating switch executing the voltage regulating operation, which can include the contact switching action, the tapping winding connection switching, etc.

[0050] The consideration behind the present embodiment is that only when the overload determination result is not overloaded, the target voltage regulation parameter is determined and the gear switching is performed, which can avoid aggravating the equipment loss under the overload working condition. Considering that a single data cannot comprehensively reflect the running working condition, for example, the voltage deviation determines the voltage regulation direction and amplitude, the load data and the switching working current affect the switching speed, and the initial tapping gear limits the target gear range. The present embodiment combines the voltage deviation, the initial tapping gear and other multi-dimensional data, and calculates the target voltage regulation parameter through multi-parameter cooperation, which can ensure accurate and smooth gear switching, meet the voltage regulation demand, and ensure the stable operation of the voltage regulation switch and the transformer.

[0051] For example, after the overload determination result is not overloaded, the voltage deviation (such as -3V, negative deviation needs to be boosted), the initial tapping gear (such as the current 2 gears, the total gears 1-5 gears), the transformer load data (such as the load power 80kW, the change rate 5kW / min, which belongs to the medium load stable load) and the switching working current (such as 30A, which is lower than the rated 50A) are obtained, and a preset voltage deviation-gear adjustment amplitude table is obtained, for example, the deviation ±2~±4V corresponds to the adjusted gear number which can be 1 gear.

[0052] According to the voltage deviation -3V and the voltage deviation-gear adjustment amplitude table, the present embodiment can determine that 1 gear needs to be boosted, and the target tapping gear is 3 gears combined with the initial 2 gears; according to the medium load stable load characteristics, the present embodiment can set the gear switching interval time to be 200ms to avoid switching too fast when the load fluctuates; referring to the switching working current 30A (low load current), the present embodiment can set the switching action duration to be 150ms to ensure the smooth connection and disconnection of the contacts, and finally form a target voltage regulation parameter set.

[0053] The present embodiment can send the target voltage regulation parameter to the voltage regulation switch driving mechanism, the driving mechanism controls the switch action according to the parameter, first disconnects the 2 gear contacts (for 150ms), and closes the 3 gear contacts after 200ms, which completes the connection switching of the tapping winding; during the switching process, the switching working current and the secondary side voltage are monitored in real time, after confirming that there is no abnormality, the gear switching result is recorded, and the voltage regulation operation is completed.

[0054] From the above, the present embodiment can accurately distinguish the root cause of the voltage deviation through the secondary side voltage deviation preliminary judgment and the primary side power grid voltage and secondary side load voltage joint verification mode, if the secondary side voltage deviation is in a reasonable range (between the second difference threshold and the first difference threshold), the voltage regulation needs to be further determined in combination with the primary side power grid voltage fluctuation, which avoids the invalid voltage regulation or excessive voltage regulation caused by the misjudgment of a single parameter, significantly reduces the mechanical wear of the switch, and prolongs the service life of the equipment.

[0055] The embodiment determines the voltage regulation demand first, and then performs fault judgment on the vacuum bubble insulation data (to ensure arc extinguishing safety) and the voltage regulating switch temperature (to avoid high temperature failure), and then performs overload judgment on the switch working current. Only when there is no fault and no overload, the voltage regulation is performed to exclude the security risks, prevent equipment damage caused by insulation failure, high temperature or current overload, and ensure the safe operation of the on-load voltage regulating switch and the distribution transformer.

[0056] In the embodiment, the voltage deviation, the initial tap position, the load data and the switch working current are comprehensively considered when determining the target voltage regulation parameter, so as to ensure that the voltage regulation parameter is accurately matched with the actual load demand and the equipment operation state, avoid excessive or insufficient voltage regulation amplitude caused by single parameter, and ensure that the secondary side load always obtains stable voltage, thereby meeting the reliable power supply demand of multiple scenes and indirectly improving the power supply quality of the entire power system.

[0057] In an embodiment of the present application, the voltage regulation demand is obtained based on the primary side grid voltage sequence and the secondary side load voltage sequence, including:

[0058] The primary side voltage fluctuation amplitude is calculated based on the primary side grid voltage sequence, and the secondary side voltage fluctuation amplitude is calculated based on the secondary side load voltage sequence;

[0059] If the primary side voltage fluctuation amplitude does not exceed the first voltage fluctuation threshold, and the secondary side voltage fluctuation amplitude does not exceed the second voltage fluctuation threshold, it is determined that the voltage regulation demand is no voltage regulation demand;

[0060] If the primary side voltage fluctuation amplitude does not exceed the first voltage fluctuation threshold, and the secondary side voltage fluctuation amplitude exceeds the second voltage fluctuation threshold, the voltage regulation demand is determined based on the secondary side load voltage sequence;

[0061] If the primary side voltage fluctuation amplitude exceeds the first voltage fluctuation threshold, and the secondary side voltage fluctuation amplitude exceeds the second voltage fluctuation threshold, the voltage regulation demand is determined based on the primary side grid voltage sequence.

[0062] In the embodiment, the voltage regulation demand is determined based on the secondary side load voltage sequence, specifically including:

[0063] The secondary side load voltage sequence is divided into multiple window subsequences based on the sliding window, and the secondary side load voltage mean value of each window subsequence is calculated;

[0064] The difference between the secondary side voltage target value and each secondary side load voltage mean value is calculated, all the difference values are combined to form a secondary side difference value sequence, and the secondary side voltage trend feature is determined based on the secondary side difference value sequence;

[0065] The voltage regulation demand is determined based on the secondary side voltage trend feature and the secondary side difference value sequence.

[0066] In the embodiment, the voltage regulating demand is determined based on the secondary voltage trend feature and the secondary difference sequence, and specifically includes:

[0067] If the secondary voltage trend feature is an increasing trend, and the last difference in the secondary difference sequence is greater than the third difference threshold, it is determined that the voltage regulating demand is voltage reduction; the positive difference indicates that the secondary load voltage average is greater than the secondary voltage target value; the third difference threshold is positive and the third difference threshold is less than the first difference threshold.

[0068] If the secondary voltage trend feature is a decreasing trend, and the last difference in the secondary difference sequence is less than the fourth difference threshold, it is determined that the voltage regulating demand is voltage increase; the negative difference indicates that the secondary load voltage average is less than the secondary voltage target value; the fourth difference threshold is negative and the fourth difference threshold is greater than the second difference threshold.

[0069] In the embodiment, the intelligent on-load voltage regulating switch control method further includes:

[0070] If the secondary voltage trend feature is an increasing trend, and the last difference in the secondary difference sequence is not greater than the third difference threshold, it is determined that the voltage regulating demand is no voltage regulating demand.

[0071] If the secondary voltage trend feature is a decreasing trend, and the last difference in the secondary difference sequence is not less than the fourth difference threshold, it is determined that the voltage regulating demand is no voltage regulating demand.

[0072] If the secondary voltage trend feature is a stable trend, it is determined that the voltage regulating demand is no voltage regulating demand.

[0073] When the secondary voltage trend feature is an increasing trend, and the last difference in the secondary difference sequence is not greater than the third difference threshold, at this time, although the voltage is in an upward trend, the deviation does not reach the critical value (the third difference threshold) of triggering voltage reduction, and there is no need to actively reduce the voltage, so it can be determined that the voltage regulating demand is no voltage regulating demand, and the voltage sequence change continues to be monitored.

[0074] When the secondary voltage trend feature is a decreasing trend, and the last difference in the secondary difference sequence is not less than the fourth difference threshold, at this time, although the voltage is in a downward trend, the deviation does not reach the critical value (the fourth difference threshold) of triggering voltage increase, and there is no need to actively increase the voltage, so it can be determined that the voltage regulating demand is no voltage regulating demand, and the voltage sequence change continues to be monitored.

[0075] When the secondary voltage trend feature is a stable trend, no matter what range the last difference in the secondary difference sequence is in, it is determined that the voltage state is stable, it is determined that the voltage regulating demand is no voltage regulating demand, and the voltage sequence change continues to be monitored.

[0076] In the embodiment, the primary side voltage fluctuation amplitude refers to a voltage variation range calculated based on a primary side grid voltage sequence, which may include, for example, a difference between a maximum value and a minimum value of the primary side voltage within a preset time window. The secondary side voltage fluctuation amplitude refers to a voltage variation range calculated based on a secondary side grid voltage sequence, which may include, for example, a difference between a maximum value and a minimum value of the secondary side voltage within a preset time window. The first voltage fluctuation threshold refers to a critical value preset for judging whether the primary side voltage fluctuation is normal, which may include, for example, a fluctuation numerical range determined based on a primary side rated voltage, a corresponding voltage percentage, etc., for defining a stable boundary of the primary side grid voltage. The second voltage fluctuation threshold refers to a critical value preset for judging whether the secondary side voltage fluctuation is normal, which may include, for example, a fluctuation numerical range determined based on a secondary side rated voltage, a corresponding voltage percentage, etc., for defining a stable boundary of the secondary side load voltage. The sliding window refers to an analysis interval obtained by dividing the secondary side load voltage sequence at a fixed time interval, which may include, for example, a window length, a window moving step, etc., for extracting local features of the voltage sequence. The window sub-sequence refers to a local data set of the secondary side load voltage obtained by dividing the secondary side load voltage sequence by the sliding window, which may include, for example, voltage collection values within each window, a time interval corresponding to the window, etc.

[0077] The secondary side difference sequence refers to a data set composed of differences between the secondary side voltage target value and voltage mean values of each window sub-sequence. The secondary side voltage trend feature refers to a voltage change direction and law presented based on the secondary side difference sequence, which may include, for example, an increasing trend, a decreasing trend, and a number of windows in which the trend is sustained, etc., for reflecting a dynamic change situation of the secondary side voltage. The third difference threshold refers to a secondary side difference critical value preset for triggering a voltage reduction demand. The fourth difference threshold refers to a secondary side difference critical value preset for triggering a voltage increase demand.

[0078] Considering that only the secondary side fluctuation exceeds the threshold value, the fluctuation is caused by the load side; and when both sides exceed the threshold value, the fluctuation is caused by the grid side, the embodiment first calculates the primary side voltage fluctuation amplitude and the secondary side voltage fluctuation amplitude to judge the voltage regulation demand in different scenarios, and then accurately locates the voltage fluctuation source to avoid single data misjudgment. The embodiment divides the secondary side voltage sequence by the sliding window, which can capture local voltage trends, exclude transient fluctuation interference, and ensure reliable trend judgment. The third difference threshold and the fourth difference threshold are introduced, and form a specific size relationship with the first difference threshold and the second difference threshold, which can further filter effective voltage regulation demands, prevent unnecessary operations triggered by slight fluctuations, and balance the response speed and device stability. The embodiment cooperates with multi-dimensional data and hierarchical thresholds to ensure accurate and actual working condition-matching voltage regulation demand judgment, which can avoid invalid or excessive voltage regulation.

[0079] For example, the embodiment can obtain a primary side grid voltage sequence (1 second per acquisition, 60 data in total, primary side rated 10 kV) and a secondary side load voltage sequence (1 second per acquisition, secondary side rated 220 V) for 1 minute; calculate the maximum value 10200 V and the minimum value 9750 V of the primary side voltage, the primary side voltage fluctuation amplitude 450 V, and retrieve the preset first voltage fluctuation threshold ±500 V; calculate the maximum value 228 V and the minimum value 213 V of the secondary side voltage, the secondary side voltage fluctuation amplitude 15 V, and retrieve the preset second voltage fluctuation threshold ±6.6 V.

[0080] The embodiment can preliminarily determine the voltage regulation demand direction according to the scene, compare the fluctuation amplitudes with the thresholds: the primary side voltage fluctuation amplitude 450 V < 500 V (not exceeding the first threshold), and the secondary side voltage fluctuation amplitude 15 V > 6.6 V (exceeding the second threshold), determine that the fluctuation is from the load side, and determine the voltage regulation demand based on the secondary side load voltage sequence and the fluctuation amplitude; if the primary side voltage fluctuation amplitude exceeds 500 V, and the secondary side voltage fluctuation amplitude exceeds 6.6 V, determine that the fluctuation is from the grid side, and determine the demand based on the primary side grid voltage sequence and the fluctuation amplitude; if the primary side voltage fluctuation amplitude and the secondary side voltage fluctuation amplitude do not exceed the thresholds, determine that the voltage regulation demand is no voltage regulation demand.

[0081] The embodiment can calculate the secondary side difference sequence and the trend characteristics based on the load side fluctuation scene, if it is determined that the fluctuation is from the load side, divide the secondary side sequence by using a sliding window, and assume that three window subsequences are obtained; calculate the voltage mean values of the window subsequences: 224 V for window 1, 225 V for window 2, and 226 V for window 3; take 220 V as the target value of the secondary side voltage, calculate the differences between the target value and the mean values, and form the secondary side difference sequence: +4 V, +5 V, and +6 V; the embodiment can determine that the trend characteristics of the secondary side voltage are an increasing trend by comparing the adjacent differences, and the trend is continuous for three windows.

[0082] The embodiment can retrieve a third difference threshold +3 V and a fourth difference threshold -4 V; the current trend characteristics of the secondary side voltage are an increasing trend, and the last difference value in the difference sequence is greater than the third difference threshold, in combination with the positive difference value indicating that the mean value of the voltage is greater than the target value, to determine that the voltage regulation demand is step-down; if the trend characteristics are a decreasing trend (for example, the difference sequence -3 V→-4 V→-5 V), the last difference value is -5 V, which is less than the fourth difference threshold -4 V, in combination with the negative difference value indicating that the mean value of the voltage is less than the target value, to determine that the voltage regulation demand is step-up; if the trend is stable or the difference value does not reach the threshold, it is determined that there is no voltage regulation demand.

[0083] In one aspect, the embodiment can achieve accurate positioning of fluctuation sources and avoid misjudgment of voltage regulation demand. By comparing the voltage fluctuation amplitudes of the primary side and the secondary side and the corresponding threshold values, the embodiment can distinguish whether the fluctuation is from the grid side or the load side, focus on load side analysis when only the secondary side fluctuation exceeds the threshold value, and lock the grid side when both sides exceed the threshold value, thereby solving the problem of easy misjudgment of the source in single dependence on secondary side data, ensuring that the voltage regulation direction matches the fluctuation source, and avoiding invalid voltage regulation operation.

[0084] On the other hand, the embodiment can improve the reliability of trend judgment and exclude transient interference. The embodiment divides the secondary side voltage sequence by using a sliding window, constructs a difference sequence by using the mean values of the window sub-sequences, can capture the local stable voltage trend, avoid the influence of accidental voltage peaks, and combines the number of trend continuous windows to make the voltage change trend analysis more in line with the actual operating conditions, thereby providing a reliable basis for voltage regulation demand.

[0085] In still another aspect, the embodiment balances response speed and device stability, and reduces excessive voltage regulation. The third and fourth difference thresholds having a specific size relationship with the first and second thresholds are introduced to filter effective voltage regulation demand. For example, the third threshold being smaller than the first threshold can prevent slight positive deviation from triggering voltage reduction, and the fourth threshold being larger than the second threshold can avoid slight negative deviation from starting voltage increase, thereby ensuring fast response when the voltage exceeds the limit, preventing frequent voltage regulation from aggravating switch loss, prolonging device life, and maintaining stable power supply at the same time.

[0086] In an embodiment of the present application, the target voltage regulation parameters include gear switching direction, target gear, and gear switching speed; the target voltage regulation parameters are determined based on voltage deviation, initial tapping gear, voltage regulation demand, load data of the transformer, and switch operating current, including: determining the gear switching direction based on the voltage regulation demand; determining the target gear based on the voltage deviation, the initial tapping gear, and the gear switching direction; and determining the gear switching speed based on the load data of the transformer and the switch operating current.

[0087] In the embodiment, the target gear is determined based on the voltage deviation, the initial tapping gear, and the gear switching direction, specifically including: determining the gear adjustment bit number based on the voltage deviation, and determining the target gear based on the initial tapping gear, the gear switching direction, and the gear adjustment bit number.

[0088] In the embodiment, the gear switching direction refers to the direction in which the voltage regulation switch switches from the initial tapping gear to the target gear, for example, which can include the voltage increase direction (switching to a higher gear) and the voltage decrease direction (switching to a lower gear). The target gear refers to the tapping gear that the voltage regulation switch needs to reach after switching, for example, which can include a specific gear number, a voltage regulation amplitude corresponding to the gear, etc. The gear switching speed refers to the rate at which the voltage regulation switch completes a single gear switching or the entire switching from the initial gear to the target gear, for example, which can include the time interval of a single gear switching or the total time length of the entire switching.

[0089] The consideration behind the present embodiment is that the gear switching direction is directly determined by the voltage regulation demand, which can ensure that the switching direction is consistent with the voltage regulation target; the target gear needs to be determined in combination with the voltage deviation and the initial tapping gear, which can both match the required adjustment range through the voltage deviation and avoid exceeding the gear range according to the initial gear; considering that different load types and current sizes have different sensitivities to switching speed, the present embodiment determines the gear switching speed according to the load data and the switching working current, which can prevent current impact caused by too fast switching. The present embodiment determines the target voltage regulation parameter in multiple dimensions to ensure efficient and stable voltage regulation operation.

[0090] For example, the specific implementation process of determining the target voltage regulation parameter can include:

[0091] After the overload determination result is no overload, it is known that the voltage regulation demand is voltage reduction, and based on the voltage regulation demand, the present embodiment can directly determine that the gear switching direction is the voltage reduction direction, i.e., switching from the current higher gear to the lower gear. It is known that the voltage deviation is +6V (the secondary side voltage is 6V higher), and the initial tapping gear is 4 gears (the switch has 5 gears in total, and each gear can adjust the voltage by about 3V), and the present embodiment can combine the voltage reduction gear switching direction to calculate that 2 gears need to be switched downward from the 4th gear, and determine that the target gear is the 2nd gear. The present embodiment can obtain the load data of the transformer as an inductive load (such as a motor load) and the switching working current as 45A (close to the rated current of 50A), and since the inductive load and high current working conditions are prone to impact under too fast switching, the present embodiment can set the single gear switching interval time to 1.5 seconds, and determine that the gear switching speed is 1 gear per 1.5 seconds.

[0092] In the present embodiment, the gear switching speed is determined based on the load data of the transformer and the switching working current, specifically including:

[0093] The load rate is determined based on the load data of the transformer, and the initial gear switching speed is determined based on the load rate; the load rate and the initial gear switching speed are positively correlated;

[0094] The ratio of the switching working current to the rated working current is calculated, and the current correction coefficient is determined based on the ratio;

[0095] The initial gear switching speed is corrected based on the current correction coefficient to obtain the gear switching speed.

[0096] In the present embodiment, the load rate refers to the proportion of the real-time load condition of the transformer to the rated load, which is used to represent the load degree, and can be calculated according to the real-time load power and the rated load power. The initial gear switching speed refers to the basic speed of the gear switching determined only based on the load rate, which increases with the increase of the load rate. The current correction coefficient refers to a correction factor determined based on the ratio of the switching working current to the rated working current, which is used to adjust the initial gear switching speed to adapt the final speed to the current working condition.

[0097] The consideration behind this embodiment is that the load rate reflects the transformer's load condition. Rapid switching under heavy load can easily cause voltage fluctuations. Therefore, this embodiment sets the load rate to be positively correlated with the initial switching speed. Considering that the switch operating current is related to the equipment's operating load, the switching protection equipment needs to be slowed down when the current is too high. This embodiment adjusts the speed through a current correction coefficient to ensure that the switching is both suitable for the load and ensures equipment safety.

[0098] For example, in this embodiment, the real-time load power in the transformer load data is 400kVA. The rated load power of the transformer is known to be 800kVA. The load rate is calculated as 400kVA÷800kVA=50%. In this embodiment, according to the preset load rate-initial speed mapping relationship, the initial gear switching speed corresponding to 50% load rate is 200ms / gear.

[0099] In this embodiment, the operating current of the voltage regulator switch is 30A, and the rated operating current of the switch is known to be 50A. The ratio of the two is calculated to be 30A ÷ 50A = 60%. According to the preset current ratio-correction coefficient mapping relationship, the current correction coefficient corresponding to the 60% current ratio is 1.0. The preset current ratio-correction coefficient mapping relationship can include a current correction coefficient of 1.0 when the switch operating current does not exceed the rated operating current of the switch, and a current correction coefficient of 0.9 when the switch operating current exceeds the rated operating current of the switch.

[0100] In this embodiment, the initial gear switching speed of 200ms / gear can be multiplied by the current correction factor of 1.0 to obtain 200ms / gear × 1.0 = 200ms / gear. This value is the final gear switching speed used to control the voltage regulator switch.

[0101] For example, such as Figure 2 As shown, in the commonly used no-excitation switch 1, position 1: 3 and 4 shorted, 10500 volts, the secondary output voltage is the lowest; position 2: 4 and 2 shorted, 10250 volts; position 3: 2 and 5 shorted, 10000 volts; position 4: 5 and 1 shorted, 9750 volts; position 5: 1 and 6 shorted, 9500 volts, the secondary output voltage is the highest; 6 is used as an output line connected to another phase.

[0102] In the commonly used no-excitation switch, position 1: X2 and X3 shorted, 10500 rpm, lowest secondary output voltage; position 2: X3 and X4 shorted, 10250 rpm; position 3: X4 and X5 shorted, 10000 rpm; position 4: X5 and X6 shorted, 9750 rpm; position 5: X6 and X7 shorted, 9500 rpm, highest secondary output voltage; X7 is used as an output line connected to another phase.

[0103] In the on-load voltage regulating switch, 1 gear: X2, X3 short circuit, 10500 V secondary output voltage is the lowest; 2 gear: X3, X4 short circuit, 10250 V; 3 gear: X4, X5 short circuit, 10000 V; 4 gear: X5, X6 short circuit, 9750 V; 5 gear: X6, X7 short circuit, 9500 V, the highest secondary output voltage; A2 is connected to another phase as the output line.

[0104] As shown in the drawings, Figure 3 and Figure 4 as shown, Figure 3 a front view of the on-load voltage regulating switch provided by an embodiment of the present application, Figure 4 a back view of the on-load voltage regulating switch provided by an embodiment of the present application.

[0105] The embodiment can accurately determine the target voltage regulating parameter. Specifically, the embodiment determines the gear switching direction according to the voltage regulating requirement, avoids direction error; the target gear combines the voltage deviation and the initial gear to ensure that the adjustment range is accurate and does not exceed the gear range; the gear switching speed is adapted to the load and the current to prevent impact. Finally, the on-load voltage regulating switch is ensured to complete the gear switching smoothly and safely, the voltage is effectively maintained stable, and the equipment loss is reduced.

[0106] In an embodiment of the present application, the insulation data of the vacuum bulb includes an insulation resistance value of the vacuum bulb; the insulation resistance value of the vacuum bulb is obtained by an insulation detection module of the secondary aviation socket; the fault determination result includes any one of no fault, vacuum bulb insulation fault and switch temperature fault, and vacuum bulb insulation fault and switch temperature fault; the insulation data of the vacuum bulb and the temperature of the voltage regulating switch are subjected to fault determination to obtain the fault determination result, including: if the temperature of the voltage regulating switch does not exceed a switch temperature threshold value, and the insulation resistance value of the vacuum bulb is greater than or equal to a first insulation threshold value, it is determined that the fault determination result is no fault; if the insulation resistance value of the vacuum bulb is less than the first insulation threshold value, it is determined that the vacuum bulb insulation fault; if the temperature of the voltage regulating switch exceeds the switch temperature threshold value, it is determined that the switch temperature fault.

[0107] In the embodiment, the switch temperature threshold value refers to a pre-set highest temperature critical value for safe operation of the voltage regulating switch. The first insulation threshold value refers to a pre-set lowest insulation resistance critical value for determining that the insulation performance of the vacuum bulb is qualified. The vacuum bulb insulation fault refers to a fault type in which the insulation performance of the vacuum bulb does not meet the safe operation requirement. The switch temperature fault refers to a fault type in which the temperature of the voltage regulating switch exceeds the safe operation range.

[0108] Considering that the insulation resistance of the vacuum bulb and the temperature of the voltage regulating switch are core factors affecting voltage regulation safety, they need to be determined respectively to fully investigate the risks. The embodiment clearly defines the independent determination conditions of the two types of faults, which can accurately locate the fault type; it ensures that there is no blind area in fault determination, provides clear basis for whether the voltage regulation is allowed subsequently, and guarantees the safety of the equipment.

[0109] Exemplarily, the specific implementation process of fault determination on the vacuum bulb insulation data and the temperature of the voltage regulating switch can include:

[0110] The embodiment can set the switch temperature threshold value to 110 DEG C and the first insulation threshold value to 800 MΩ as the reference standard of fault determination. The embodiment can read the insulation resistance value of the vacuum bulb as 750 MΩ through the insulation detection module of the secondary aviation socket; and read the temperature of the voltage regulating switch as 105 DEG C through the temperature sensor.

[0111] The embodiment can compare the insulation resistance value 750 MΩ with the first insulation threshold value 800 MΩ, and since 750 MΩ is less than 800 MΩ, it is determined that there is a vacuum bulb insulation fault; and compare the actual measured temperature with the switch temperature threshold value, and since the body temperature 105 DEG C does not exceed 110 DEG C, it is determined that there is no switch temperature fault. The embodiment can determine the fault determination result as a vacuum bulb insulation fault by comprehensively determining the two types of results.

[0112] The embodiment can accurately determine the fault type, which not only respectively investigates the vacuum bulb insulation and the switch temperature problem through independent threshold values, but also covers all fault scenarios to avoid the risk of omission; the clear determination logic can quickly locate the fault, provide a basis for subsequent voltage regulation stop or maintenance, and effectively ensure the safe operation of the voltage regulating switch.

[0113] Corresponding to the intelligent on-load voltage regulating switch control method of the above embodiment, Figure 5 The structural block diagram of the intelligent on-load voltage regulating switch control system provided by an embodiment of the present application is shown. For ease of illustration, only the parts related to the embodiments of the present application are shown. For reference Figure 5 The intelligent on-load voltage regulating switch control system 20 includes a data acquisition module 21, a voltage regulating demand analysis module 22, a safety determination module 23, and a voltage regulating control module 24.

[0114] The data acquisition module 21 is configured to acquire a primary side power grid voltage sequence and a secondary side load voltage sequence of a transformer.

[0115] The voltage regulating demand analysis module 22 is configured to calculate a voltage deviation based on the secondary side load voltage sequence and a secondary side voltage target value; if the voltage deviation is greater than a first difference threshold value, it is determined that the voltage regulating demand is voltage reduction; if the voltage deviation is less than a second difference threshold value, it is determined that the voltage regulating demand is voltage increase; if the voltage deviation is greater than or equal to the second difference threshold value and less than or equal to the first difference threshold value, the voltage regulating demand is obtained based on the primary side power grid voltage sequence and the secondary side load voltage sequence; the voltage regulating demand includes any one of voltage increase, voltage reduction, or no voltage regulating demand;

[0116] The security determination module 23 is configured to: if the voltage regulation demand is any one of voltage step-up and voltage step-down, acquire the voltage regulation switch temperature of the voltage regulation switch and insulation data of the vacuum bulb; perform fault determination on the insulation data of the vacuum bulb and the voltage regulation switch temperature to obtain a fault determination result; the vacuum bulb is configured to perform vacuum arc extinction on an electric arc generated when the contact of the voltage regulation switch acts; if the fault determination result is no fault, acquire the switch working current of the voltage regulation switch, and perform overload determination on the switch working current to obtain an overload determination result;

[0117] The voltage regulation control module 24 is configured to: if the overload determination result is no overload, acquire the load data of the transformer and the initial tapping position of the voltage regulation switch; determine a target voltage regulation parameter based on the voltage deviation, the initial tapping position, the voltage regulation demand, the load data of the transformer and the switch working current; and control the voltage regulation switch to perform position switching based on the target voltage regulation parameter.

[0118] In an embodiment of the present application, the voltage regulation demand analysis module 22, when calculating the voltage deviation based on the secondary side load voltage sequence and the secondary side voltage target value, is specifically configured to: calculate the secondary side load voltage mean value based on the secondary side load voltage sequence; and calculate the difference between the secondary side load voltage mean value and the secondary side voltage target value as the voltage deviation.

[0119] In an embodiment of the present application, the voltage regulation demand analysis module 22, when obtaining the voltage regulation demand based on the primary side power grid voltage sequence and the secondary side load voltage sequence, is specifically configured to:

[0120] calculate the primary side voltage fluctuation amplitude based on the primary side power grid voltage sequence, and calculate the secondary side voltage fluctuation amplitude based on the secondary side load voltage sequence;

[0121] if the primary side voltage fluctuation amplitude does not exceed the first voltage fluctuation threshold value, and the secondary side voltage fluctuation amplitude does not exceed the second voltage fluctuation threshold value, determine that the voltage regulation demand is no voltage regulation demand;

[0122] if the primary side voltage fluctuation amplitude does not exceed the first voltage fluctuation threshold value, and the secondary side voltage fluctuation amplitude exceeds the second voltage fluctuation threshold value, determine the voltage regulation demand based on the secondary side load voltage sequence;

[0123] if the primary side voltage fluctuation amplitude exceeds the first voltage fluctuation threshold value, and the secondary side voltage fluctuation amplitude exceeds the second voltage fluctuation threshold value, determine the voltage regulation demand based on the primary side power grid voltage sequence.

[0124] In an embodiment of the present application, the voltage regulation demand analysis module 22, when determining the voltage regulation demand based on the secondary side load voltage sequence, is specifically configured to:

[0125] divide the secondary side load voltage sequence into a plurality of window subsequences based on a sliding window, and calculate the secondary side load voltage mean value of each window subsequence.

[0126] determining a difference between each secondary-side load voltage average and the secondary-side voltage target value, grouping all the differences in time sequence to form a secondary-side difference sequence, and determining a secondary-side voltage trend feature based on the secondary-side difference sequence;

[0127] determining a voltage regulation demand based on the secondary-side voltage trend feature and the secondary-side difference sequence.

[0128] In an embodiment of the present application, when determining the voltage regulation demand based on the secondary-side voltage trend feature and the secondary-side difference sequence, the voltage regulation demand analysis module 22 is specifically configured to:

[0129] if the secondary-side voltage trend feature is an increasing trend and the last difference in the secondary-side difference sequence is greater than a third difference threshold, determining that the voltage regulation demand is voltage reduction; the positive difference indicates that the secondary-side load voltage average is greater than the secondary-side voltage target value; the third difference threshold is positive and the third difference threshold is less than the first difference threshold;

[0130] if the secondary-side voltage trend feature is a decreasing trend and the last difference in the secondary-side difference sequence is less than a fourth difference threshold, determining that the voltage regulation demand is voltage increase; the negative difference indicates that the secondary-side load voltage average is less than the secondary-side voltage target value; the fourth difference threshold is negative and the fourth difference threshold is greater than the second difference threshold.

[0131] In an embodiment of the present application, the target voltage regulation parameter includes a gear shift direction, a target gear and a gear shift speed; when determining the target voltage regulation parameter based on the voltage deviation, the initial tapping gear, the voltage regulation demand, the load data of the transformer and the switching working current, the voltage regulation control module 24 is specifically configured to: determine the gear shift direction based on the voltage regulation demand; determine the target gear based on the voltage deviation, the initial tapping gear and the gear shift direction; and determine the gear shift speed based on the load data of the transformer and the switching working current.

[0132] In an embodiment of the present application, the insulation data of the vacuum bulb includes an insulation resistance value of the vacuum bulb; the insulation resistance value of the vacuum bulb is obtained by an insulation detection module of the secondary aviation socket; and the fault determination result includes any one of no fault, vacuum bulb insulation fault and switching temperature fault, and vacuum bulb insulation fault and switching temperature fault.

[0133] When determining the fault determination result based on the insulation data of the vacuum bulb and the voltage regulation switching temperature, the safety determination module 23 is specifically configured to:

[0134] if the voltage regulation switching temperature does not exceed the switching temperature threshold and the insulation resistance value of the vacuum bulb is greater than or equal to a first insulation threshold, determining that the fault determination result is no fault.

[0135] If the insulation resistance value of the vacuum bulb is less than the first insulation threshold, then the vacuum bulb is determined to be in insulation failure.

[0136] If the temperature of the voltage regulator switch exceeds the switch temperature threshold, then a switch temperature fault is determined.

[0137] See Figure 6 , Figure 6 This is a schematic block diagram of an electronic device provided according to an embodiment of this application. Figure 6 The electronic device 300 in this embodiment may include one or more processors 301, one or more input devices 302, one or more output devices 303, and one or more memories 304. The processors 301, input devices 302, output devices 303, and memories 304 communicate with each other via a communication bus 305. The memories 304 store computer programs, including program instructions. The processors 301 execute the program instructions stored in the memories 304. Specifically, the processors 301 are configured to invoke the program instructions to perform the functions of the modules in the aforementioned system embodiments, for example... Figure 5 The functions of the data acquisition module 21, voltage regulation demand analysis module 22, safety judgment module 23, and voltage regulation control module 24 are shown.

[0138] It should be understood that, in the embodiments of this application, the processor 301 may be a central processing unit (CPU), but it may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0139] Input device 302 may include a touchpad, a fingerprint sensor (for collecting the user's fingerprint information and fingerprint orientation information), a microphone, etc., and output device 303 may include a display (LCD, etc.), a speaker, etc.

[0140] The memory 304 may include read-only memory and random access memory, and provides instructions and data to the processor 301. A portion of the memory 304 may also include non-volatile random access memory. For example, the memory 304 may also store load type information.

[0141] In specific implementations, the processor 301, the input device 302, and the output device 303 described in the embodiments of the present application can perform the implementation manners described in the embodiments of the intelligent on-load voltage regulating switch control method provided by the embodiments of the present application, and can also perform the implementation manners of the electronic device 300 described in the embodiments of the present application, which will not be described here.

[0142] In another embodiment of the present application, a computer readable storage medium is provided, which stores a computer program. The computer program includes program instructions, which are executed by a processor to implement all or part of the processes of the above-mentioned embodiments. The computer program can also be used to instruct related hardware to complete the processes. The computer program can be stored in a computer readable storage medium. When the computer program is executed by the processor, the steps of the above-mentioned method embodiments can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer readable medium can include any entity or device capable of carrying the computer program code, recording medium, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0143] The computer readable storage medium can be an internal storage unit of the electronic device of any of the above-mentioned embodiments, such as a hard disk or a memory of the electronic device. The computer readable storage medium can also be an external storage device of the electronic device, such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc. Further, the computer readable storage medium can include both the internal storage unit and the external storage device of the electronic device. The computer readable storage medium is used to store the computer program and other programs and data required by the electronic device. The computer readable storage medium can also be used to temporarily store data that has been output or will be output.

[0144] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the electronic device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

[0145] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the electronic device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and will not be repeated here.

[0146] In several embodiments provided in the present application, it should be understood that the disclosed electronic device and method can be implemented in other ways. For example, the system embodiments described above are merely schematic, for example, the division of the module / unit is only a logical function division, and actual implementation can have another division manner, for example, a plurality of modules, units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be indirect coupling or communication connection through some interfaces or modules / units, and can also be electrical, mechanical or other form of connection.

[0147] The module / unit described as a separate component can be or can not be physically separated, and the component displayed as a module / unit can be or can not be a physical module / unit, that is, can be located in one place, or can be distributed to a plurality of network modules / units. Part or all of the modules / units can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0148] In addition, each functional module / unit in each embodiment of the present application can be integrated in one processing module / unit, or each module / unit can exist physically, or two or more modules / units can be integrated in one module / unit. The integrated module / unit can be realized in the form of hardware or in the form of a software functional module / unit.

[0149] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for controlling an intelligent on-load tap changer, characterized in that, The method comprises the following steps: obtaining a primary side grid voltage sequence and a secondary side load voltage sequence of a transformer; calculating a voltage deviation based on the secondary side load voltage sequence and a secondary side voltage target value; if the voltage deviation is greater than a first difference threshold, determining that a voltage regulating demand is voltage reduction; if the voltage deviation is less than a second difference threshold, determining that the voltage regulating demand is voltage increase; if the voltage deviation is greater than or equal to the second difference threshold and less than or equal to the first difference threshold, obtaining the voltage regulating demand based on the primary side grid voltage sequence and the secondary side load voltage sequence; the voltage regulating demand comprises any one of voltage increase, voltage reduction or no voltage regulating demand; if the voltage regulating demand is any one of the voltage increase and the voltage reduction, obtaining a voltage regulating switch temperature of a voltage regulating switch and insulation data of a vacuum bulb; performing fault judgment on the insulation data of the vacuum bulb and the voltage regulating switch temperature to obtain a fault judgment result; the vacuum bulb is used for vacuum arc extinguishing of an electric arc generated when a contact of the voltage regulating switch acts; if the fault judgment result is no fault, obtaining a switch working current of the voltage regulating switch, performing overload judgment on the switch working current to obtain an overload judgment result; if the overload judgment result is no overload, obtaining load data of the transformer and an initial tapping position of the voltage regulating switch; determining a target voltage regulating parameter based on the voltage deviation, the initial tapping position, the voltage regulating demand, the load data of the transformer and the switch working current; and controlling the voltage regulating switch to perform position switching based on the target voltage regulating parameter.

2. The intelligent on-load tap changer control method of claim 1, wherein, The method comprises the following steps: calculating a secondary side load voltage mean value based on the secondary side load voltage sequence; calculating a difference between the secondary side load voltage mean value and the secondary side voltage target value, and taking the difference as the voltage deviation.

3. The intelligent on-load tap changer control method of claim 1, wherein, The method comprises the following steps: calculating a primary side voltage fluctuation amplitude based on the primary side grid voltage sequence, and calculating a secondary side voltage fluctuation amplitude based on the secondary side load voltage sequence; if the primary side voltage fluctuation amplitude does not exceed a first voltage fluctuation threshold, and the secondary side voltage fluctuation amplitude does not exceed a second voltage fluctuation threshold, determining that the voltage regulating demand is no voltage regulating demand; if the primary side voltage fluctuation amplitude does not exceed the first voltage fluctuation threshold, and the secondary side voltage fluctuation amplitude exceeds the second voltage fluctuation threshold, determining the voltage regulating demand based on the secondary side load voltage sequence; if the primary side voltage fluctuation amplitude exceeds the first voltage fluctuation threshold, and the secondary side voltage fluctuation amplitude exceeds the second voltage fluctuation threshold, determining the voltage regulating demand based on the primary side grid voltage sequence.

4. The intelligent on-load tap changer control method of claim 3, wherein, The method comprises the following steps: dividing the secondary side load voltage sequence into a plurality of window subsequences based on a sliding window, and calculating a secondary side load voltage mean value of each window subsequence; determining a difference between each secondary-side load voltage average value and a secondary-side voltage target value, grouping all the difference values in time sequence to form a secondary-side difference value sequence, and determining a secondary-side voltage trend feature based on the secondary-side difference value sequence; determining the voltage regulation demand based on the secondary-side voltage trend feature and the secondary-side difference value sequence.

5. The intelligent on-load tap changer control method of claim 4, wherein, The determination of the voltage regulation demand based on the secondary-side voltage trend feature and the secondary-side difference value sequence comprises: if the secondary-side voltage trend feature is an increasing trend and the last difference value in the secondary-side difference value sequence is greater than a third difference value threshold, determining that the voltage regulation demand is voltage reduction; a positive difference value indicates that the secondary-side load voltage average value is greater than the secondary-side voltage target value; the third difference value threshold is a positive number and the third difference value threshold is less than the first difference value threshold; if the secondary-side voltage trend feature is a decreasing trend and the last difference value in the secondary-side difference value sequence is less than a fourth difference value threshold, determining that the voltage regulation demand is voltage increase; a negative difference value indicates that the secondary-side load voltage average value is less than the secondary-side voltage target value; the fourth difference value threshold is a negative number and the fourth difference value threshold is greater than the second difference value threshold.

6. The intelligent on-load tap changer control method of claim 1, wherein, The target voltage regulation parameter comprises a gear shift direction, a target gear and a gear shift speed. The determination of the target voltage regulation parameter based on the voltage deviation, the initial tapping gear, the voltage regulation demand, the load data of the transformer and the switching working current comprises: determining the gear shift direction based on the voltage regulation demand; determining the target gear based on the voltage deviation, the initial tapping gear and the gear shift direction; determining the gear shift speed based on the load data of the transformer and the switching working current.

7. The intelligent on-load tap changer control method of claim 1, wherein, The insulation data of the vacuum bulb comprises an insulation resistance value of the vacuum bulb; the insulation resistance value of the vacuum bulb is obtained by an insulation detection module of the secondary aviation socket; the fault determination result comprises any one of no fault, vacuum bulb insulation fault and switching temperature fault, and vacuum bulb insulation fault and switching temperature fault; The fault determination of the insulation data of the vacuum bulb and the voltage regulation switching temperature to obtain a fault determination result comprises: if the voltage regulation switching temperature does not exceed a switching temperature threshold and the insulation resistance value of the vacuum bulb is greater than or equal to a first insulation threshold, determining that the fault determination result is no fault; if the insulation resistance value of the vacuum bulb is less than the first insulation threshold, determining vacuum bulb insulation fault; if the voltage regulation switching temperature exceeds the switching temperature threshold, determining switching temperature fault.

8. An intelligent on-load tap changer control system, characterized by comprises: a data acquisition module configured to acquire a primary-side grid voltage sequence and a secondary-side load voltage sequence of a transformer; The voltage regulation demand analysis module is configured to calculate a voltage deviation based on the secondary-side load voltage sequence and the secondary-side voltage target value; determine that the voltage regulation demand is voltage reduction if the voltage deviation is greater than a first difference threshold; determine that the voltage regulation demand is voltage increase if the voltage deviation is less than a second difference threshold; and determine the voltage regulation demand based on the primary-side grid voltage sequence and the secondary-side load voltage sequence if the voltage deviation is greater than or equal to the second difference threshold and less than or equal to the first difference threshold; and the voltage regulation demand includes any one of voltage increase, voltage reduction, or no voltage regulation demand. The safety determination module is configured to obtain a voltage regulation switch temperature of a voltage regulation switch and insulation data of a vacuum bulb if the voltage regulation demand is any one of the voltage increase and the voltage reduction; perform fault determination on the insulation data of the vacuum bulb and the voltage regulation switch temperature to obtain a fault determination result; and the vacuum bulb is configured to perform vacuum arc extinction on an electric arc generated when a contact of the voltage regulation switch moves. The safety determination module is configured to obtain a switch working current of the voltage regulation switch if the fault determination result is no fault; perform overload determination on the switch working current to obtain an overload determination result. The voltage regulation control module is configured to obtain load data of a transformer and an initial tapping position of the voltage regulation switch if the overload determination result is no overload. The voltage regulation control module is configured to determine a target voltage regulation parameter based on the voltage deviation, the initial tapping position, the voltage regulation demand, the load data of the transformer, and the switch working current; and control the voltage regulation switch to perform position switching based on the target voltage regulation parameter.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, the computer program comprising instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 9. The computer program is executed by the processor to implement the steps of the method according to any one of claims 1 to 7.

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