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

Abstract

The invention provides an intelligent on-load tap changer control method and system, equipment and a medium, and belongs to the technical field of intelligent control, and the method comprises the steps: obtaining voltage sequences of a primary side and a secondary side of a transformer; calculating a voltage deviation according to the secondary side voltage sequence and a voltage target value, reducing the voltage when the deviation exceeds a first difference threshold value, and increasing the voltage when the deviation is lower than a second difference threshold value; and when 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 boosting, voltage reduction or no voltage regulation requirements exist. If voltage regulation is needed, fault judgment is made according to vacuum bubble insulation data and switch temperature, and overload judgment is made according to switch working current if no fault exists. And determining a target voltage regulation parameter according to the voltage deviation, the initial tapping gear, the voltage regulation requirement, the load data and the working current when the load is not overloaded, and controlling the gear switching of the switch according to the target voltage regulation parameter. According to the invention, intelligent safety control of the on-load tap changer can be realized.

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 tapping 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 of the on-load voltage regulating switch 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 electricity 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 easy to cause ineffective 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 for 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, the application provides an intelligent on-load voltage regulating switch control method, comprising: 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 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 includes any one of voltage increase, voltage reduction or no voltage regulating demand; if the voltage regulating demand is any one of voltage increase and voltage reduction, obtaining a voltage regulating switch temperature of a voltage regulating switch and insulation data of a vacuum bubble; performing fault determination on the insulation data of the vacuum bubble and the voltage regulating switch temperature to obtain a fault determination result; the vacuum bubble is used to extinguish an electric arc generated when a contact of the voltage regulating switch acts; if the fault determination result is no fault, obtaining a switch working current of the voltage regulating switch, and performing overload determination on the switch working current to obtain an overload determination result; If the overload determination result is not overloaded, the load data of the transformer and the initial tapping position of the voltage regulating switch are obtained; the target voltage regulating parameter is determined 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 the voltage regulating switch is controlled to switch the position based on the target voltage regulating parameter.

[0006] In a second aspect, the embodiment of the present application provides an intelligent on-load voltage regulating switch control system, which comprises: 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. The voltage deviation is calculated based on the secondary side load voltage sequence and the secondary side voltage target value. If the voltage deviation is greater than a first difference threshold, it is determined that the 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 power 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. The safety determination module is configured to, if the voltage regulating demand is any one of voltage increase and voltage reduction, obtain a switch working current of the voltage regulating switch, a voltage regulating switch temperature and insulation data of the vacuum bulb. The insulation data of the vacuum bulb and the voltage regulating switch temperature are subjected to fault determination to obtain a fault determination result. The vacuum bulb is used to extinguish an arc generated when the contact of the voltage regulating switch moves. If the fault determination result is no fault, the switch working current is subjected to overload determination to obtain an overload determination result. The voltage regulating control module is configured to, if the overload determination result is not overloaded, obtain the load data of the transformer and the initial tapping position of the voltage regulating switch. The target voltage regulating parameter is determined based on the voltage deviation, the initial tapping position, the voltage regulating demand, the load data of the transformer and the switch working current. The voltage regulating switch is controlled to switch the position based on the target voltage regulating parameter.

[0007] In a third aspect, the embodiment of the present application provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of the intelligent on-load voltage regulating switch control method are implemented.

[0008] In a fourth aspect, the embodiment of the present application provides a computer readable storage medium, which stores a computer program. When the computer program is executed by a processor, the steps of the intelligent on-load voltage regulating switch control method are implemented.

[0009] The intelligent on-load voltage regulating switch control method and system, device and medium provided by the embodiment of the present application have the following advantages: The embodiment of the present application can accurately distinguish the root cause of voltage deviation through the preliminary judgment of secondary side voltage deviation and the joint verification of primary side power grid voltage and secondary side load voltage. If the secondary side voltage deviation is within a reasonable range (between the second difference threshold and the first difference threshold), it is further determined whether to adjust the voltage in combination with the primary side power grid voltage fluctuation, thereby avoiding invalid voltage adjustment or excessive voltage adjustment caused by single parameter misjudgment, significantly reducing the mechanical wear of the switch, and prolonging the service life of the equipment.

[0010] After determining the voltage regulation demand, the embodiment of the present application first performs fault judgment on the vacuum bubble insulation data (to ensure arc extinction safety) and the voltage regulation 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 (i.e. switch gear position switching) is performed, so as to exclude safety hazards and prevent equipment damage caused by insulation failure, excessive temperature or current overload, thereby ensuring the safe operation of the on-load voltage regulation switch and the distribution transformer.

[0011] When determining the target voltage regulation parameter, the embodiment of the present application comprehensively considers the voltage deviation, the initial tap position, the load data and the switch working current, ensures that the voltage regulation parameter is accurately matched with the actual load demand and the equipment operation state, avoids excessive or insufficient voltage regulation amplitude caused by single parameter, and makes the secondary side load always obtain stable voltage, thereby meeting the reliable power supply demand of multiple scenarios and indirectly improving the power supply quality of the entire power system. BRIEF DESCRIPTION OF DRAWINGS

[0012] 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 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 creating any creative labor.

[0013] Figure 1 The flowchart of the intelligent on-load voltage regulation switch control method provided by an embodiment of the present application is shown in the figure. Figure 2 The gear position switching schematic diagram of the commonly used no-load switch and the on-load voltage regulation switch provided by an embodiment of the present application is shown in the figure. Figure 3 The front view of the on-load voltage regulation switch provided by an embodiment of the present application is shown in the figure. Figure 4 The back view of the on-load voltage regulation switch provided by an embodiment of the present application is shown in the figure. Figure 5 The structural block diagram of the intelligent on-load voltage regulation switch control system provided by an embodiment of the present application is shown in the figure. Figure 6 The schematic block diagram of the electronic device provided by an embodiment of the present application is shown in the figure. DETAILED DESCRIPTION

[0014] In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular architectures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods, devices, and circuits are omitted so as not to obscure the description of the present application with unnecessary detail.

[0015] In order to make the objects, technical solutions and advantages of the present application clearer, the following will be described by specific embodiments in conjunction with the accompanying drawings.

[0016] Reference will be made to Figure 1 , Figure 1 A flowchart of a control method of an intelligent on-load tap changer provided by an embodiment of the present application is shown. The method can be executed by an electronic device. Specifically, the method can include S101-S104.

[0017] S101: Obtain a primary side grid voltage sequence and a secondary side load voltage sequence of a transformer.

[0018] In this embodiment, the voltage deviation is calculated based on the secondary side load voltage sequence and the secondary side voltage target value. Specifically, the secondary side load voltage mean value is calculated based on the secondary side load voltage sequence; and the difference between the secondary side load voltage mean value and the secondary side voltage target value is calculated, and the difference is taken as the voltage deviation.

[0019] 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 a first difference threshold, determine that the voltage regulating demand is voltage reduction; if the voltage deviation is less than a second difference threshold, determine 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, obtain the voltage regulating demand 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.

[0020] In this embodiment, the primary side grid voltage sequence refers to a set of transformer primary side input end grid voltage data collected continuously, containing the primary side voltage values at different time points within a 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 and synchronously with the primary side grid voltage sequence, containing the secondary side voltage values at different time points within the first time period.

[0021] The voltage deviation refers to the difference between the average value of the secondary side load voltage and the target value of the secondary side voltage, including the size of the deviation value and the positive or negative direction of the deviation. A positive deviation indicates that the average value of the secondary side load voltage is too high, and a negative deviation indicates that the average value of the secondary side load voltage is too low. The first difference threshold is a voltage deviation threshold value that is preset to determine whether voltage reduction is needed. The second difference threshold is a voltage deviation threshold value that is preset to determine whether voltage increase is needed. The average value of the secondary side load voltage is an average voltage value calculated based on a sequence of secondary side load voltages.

[0022] Considering that the secondary side voltage is directly related to the quality of load power supply, using it as the core to determine the voltage regulation requirement is more in line with the actual power supply target. In this embodiment, the voltage deviation is first determined based on the difference between the average value of the secondary side load voltage and the target value, and the first difference threshold and the second difference threshold are set. By using the two thresholds, the scenario that obviously needs to increase or decrease voltage can be quickly determined, thereby improving the determination 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) based on only the secondary side data, and to ensure accurate determination of the voltage regulation requirement, this embodiment further analyzes and determines the voltage regulation requirement in combination with the primary side and secondary side voltage sequences, thereby preventing invalid voltage regulation from increasing switch loss and avoiding missing necessary voltage regulation operation to affect power supply stability, and balancing efficiency and accuracy.

[0023] For example, the transformer can be a three-phase oil-immersed on-load voltage regulation distribution transformer. Taking a 10kV three-phase oil-immersed on-load voltage regulation distribution transformer with a secondary side rated voltage of 220V and a secondary side voltage target value of 220V as an example, according to the power supply requirement, the first difference threshold can be set to +4.4V, which corresponds to +2% of the secondary side rated voltage; the second difference threshold can be set to -4.4V, which corresponds to -2% of the secondary side rated voltage, and the calculation time window of the average value of the secondary side load voltage is set to 1 minute. The primary side grid voltage sequence and the secondary side load voltage sequence can be obtained by the voltage sensors pre-installed on the primary side and the secondary side of the transformer. For example, the secondary side load voltage can be collected by the voltage sensor at the output end of the secondary side at a frequency of 1 second / time to form a sequence of secondary side load voltages; 60 voltage data in the last 1 minute can be extracted from the sequence of secondary side load voltages, and the arithmetic mean value thereof is calculated. Assuming that the average value of the secondary side load voltage is 220.5V.

[0024] The embodiment can subtract the secondary side load voltage average value 220.5V from the secondary side voltage target value 220V to obtain a voltage deviation of +0.5V. Since +0.5V is greater than the second difference threshold -4.4V and less than the first difference threshold +4.4V, the embodiment can retrieve the primary side power grid voltage sequence synchronously collected, 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 value 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 value also shows a persistent downward trend, it is determined that the voltage regulation requirement is voltage increase.

[0025] 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; 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 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 overload determination is performed on the switch working current to obtain an overload determination result.

[0026] 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 switching operation is not triggered, and the embodiment can continue to monitor the primary side power 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 meets the voltage regulation triggering condition.

[0027] In the embodiment, the switch working current of the voltage regulation switch refers to the current data in the operation process of the voltage regulation switch, including the real-time working current value. The voltage regulation switch temperature refers to the temperature data when the voltage regulation switch is running, including the temperature of the key components of the switch body, such as the contact or coil temperature. The insulation data of the vacuum bulb refers to the data reflecting the insulation performance of the vacuum bulb, which can include the insulation resistance value between the two ends of the vacuum bulb. The fault determination refers to the judgment process of whether the insulation data of the vacuum bulb and the temperature of the voltage regulation switch meet the safe operation requirements. The fault determination result refers to the conclusion obtained after the fault determination, including no fault (qualified insulation and normal temperature of the vacuum bulb) and fault (deterioration of the insulation of the vacuum bulb or temperature overrun). The overload determination refers to the judgment process of whether the switch working current exceeds the rated operation range. The overload determination result refers to the conclusion obtained after the overload determination, including no overload (working current within the rated range) and overload (working current exceeding the rated range).

[0028] In the embodiment, the switch operating current and the voltage regulating switch temperature can reflect the equipment operation load and working condition, and provide a basis for judging whether the voltage regulating condition is met; the vacuum bubble insulation data is directly related to the arc extinguishing safety during voltage regulation, and can troubleshoot the fault risk in advance. Considering that the vacuum bubble is the core arc extinguishing component, poor insulation will cause arc during voltage regulation and trigger a safety accident, and temperature overrun will damage the switch component, the embodiment first makes fault judgment on the vacuum bubble insulation data and the voltage regulating switch temperature, and only when there is no fault, overload judgment is performed, which can avoid invalid overload detection and improve efficiency. It not only prioritizes the intrinsic safety of voltage regulating operation to prevent arc extinguishing failure and component damage, but also avoids executing voltage regulation under overload working condition to aggravate the equipment burden, and ensures safe voltage regulation and reduces fault risk.

[0029] For example, after determining that the voltage regulating demand is voltage increase or voltage decrease, the embodiment can first acquire the to-be-judged data, including: the vacuum bubble two-terminal insulation resistance value measured last time, the voltage regulating switch temperature data collected in real time, the preset vacuum bubble insulation resistance safety threshold (such as 1000 MΩ), and the voltage regulating switch key component temperature safety threshold (such as temperature ≤ 80℃). The voltage regulating switch temperature can be acquired through the temperature sensor pre-installed on the switch key component, and the vacuum bubble insulation resistance value can be measured periodically through the vacuum bubble insulation resistance test equipment.

[0030] The embodiment can compare the vacuum bubble insulation resistance value with the safety threshold, and if the vacuum bubble insulation resistance value exceeds 1000 MΩ, 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, and if it does not exceed the temperature threshold, 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 judgment result is no fault; if the insulation is deteriorated or the temperature is overrun, the judgment result is fault, and the voltage regulation is suspended and a fault alarm is issued.

[0031] Specifically, for the vacuum bubble insulation deterioration fault, the embodiment can suspend all operations of the voltage regulating switch, disconnect the voltage regulating switch and the power grid, trigger an audible and light alarm, and push the fault 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.

[0032] For the temperature overrun fault, the embodiment can perform temperature positioning and cause analysis to determine the overrun component and the specific temperature value; the embodiment can scan the switch body through an infrared thermal imager to locate the high temperature point and troubleshoot whether the overrun is caused by poor contact of the contact, short circuit between coil turns, 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, the 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.

[0033] The embodiment can perform overload determination when there is no fault, and first obtain the working current of the switch through the Hall current sensor pre-installed in the voltage regulating switch power supply circuit. The real-time working current of the voltage regulating switch is compared with the rated working current (e.g., 50 A). If it does not exceed 50 A, the overload determination result is no overload, and the voltage regulation operation is allowed to continue. If it exceeds 50 A, it is overload, the voltage regulation is suspended, and an overload alarm is issued. After the current returns to normal, the determination is re-performed.

[0034] S104: If the overload determination result is no overload, obtain the load data of the transformer and the initial tapping position of the voltage regulating 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 working current of the switch; and control the voltage regulating switch to switch the position based on the target voltage regulation parameter.

[0035] 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 regulation operation, which includes the current position number. The target voltage regulation parameter refers to a set of key parameters for controlling the voltage regulating switch to complete the position switching, which can include, for example, the target tapping position, the position switching interval time and the switching action duration, etc. The target voltage regulation parameter is an operation basis calculated based on multi-dimensional operation data, which can be obtained, for example, according to the voltage deviation size, the initial tapping position, the load data characteristics and the working current level of the switch. 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 performing the voltage regulation operation, which can include, for example, the contact opening and closing action, the tapping winding connection switching, etc.

[0036] The consideration behind the embodiment is that the target voltage regulation parameter is determined and the position switching is performed only when the overload determination result is no overload, which can avoid aggravating the equipment loss under the overload condition. Considering that a single data cannot comprehensively reflect the operation condition, for example, the voltage deviation determines the voltage regulation direction and amplitude, the load data and the working current of the switch affect the switching speed, and the initial tapping position limits the target position range. The embodiment combines multi-dimensional data such as voltage deviation and initial tapping position, and calculates the target voltage regulation parameter through multi-parameter cooperation, which can ensure accurate and smooth position switching, meet the voltage regulation demand, and ensure stable operation of the voltage regulating switch and the transformer.

[0037] For example, after determining that the overload is not overloaded, the voltage deviation (e.g., -3V, negative deviation needs to be boosted), the initial tap position (e.g., the current 2ndgear, the total gear 1-5 gears), the transformer load data (e.g., the load power 80kW, the change rate 5kW / min, which belongs to the medium load stable load), and the switch working current (e.g., 30A, lower than the rated 50A) are obtained, and a preset voltage deviation-gear adjustment range table is obtained, such as the deviation ±2~±4V corresponding to the adjustment gear number can be 1 gear.

[0038] According to the voltage deviation -3V and the voltage deviation-gear adjustment range table, the embodiment can determine that the voltage needs to be boosted by 1 gear, and the target tap position is 3 gears combined with the initial 2 gears; according to the medium load stable load characteristics, the embodiment can set the gear switching interval time to 200ms to avoid switching too fast when the load fluctuates; referring to the switch working current 30A (low load current), the embodiment can set the switching action duration to 150ms to ensure the smooth contact combination, and finally form the target voltage regulation parameter set.

[0039] The embodiment can send the target voltage regulation parameter to the voltage regulation switch driving mechanism, and the driving mechanism controls the switch action according to the parameter, first disconnects the 2ndgear contact (for 150ms), and closes the 3rdgear contact after 200ms, completes the connection switching of the tap winding, and records the gear switching result after confirming that there is no abnormality in the switching process, and completes the voltage regulation operation.

[0040] From the above, the embodiment can accurately distinguish the root cause of the voltage deviation by the secondary side voltage deviation preliminary judgment and the primary side 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 grid voltage fluctuation to avoid invalid voltage regulation or excessive voltage regulation caused by single parameter misjudgment, significantly reduce the switch mechanical wear, and prolong the service life of the equipment.

[0041] After determining the voltage regulation demand, the embodiment first performs fault judgment on the vacuum bubble insulation data (to ensure arc extinction safety) and the voltage regulation switch temperature (to avoid high temperature fault), and then performs overload judgment on the switch working current, only when there is no fault and no overload, the voltage regulation is executed to exclude safety hazards, prevent equipment damage caused by insulation failure, high temperature or current overload, and ensure the safe operation of the on-load voltage regulation switch and the distribution transformer.

[0042] The embodiment comprehensively considers voltage deviation, initial tapping position, load data and switch working current when determining the target voltage regulation parameter, ensures accurate matching of the voltage regulation parameter and actual load demand and equipment operation state, avoids excessive or insufficient voltage regulation range caused by single parameter, and enables the secondary side load to always obtain stable voltage, meets reliable power supply demand of multiple scenes, and indirectly improves power supply quality of the entire power system.

[0043] 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: The primary side voltage fluctuation range is calculated based on the primary side grid voltage sequence, and the secondary side voltage fluctuation range is calculated based on the secondary side load voltage sequence; If the primary side voltage fluctuation range does not exceed the first voltage fluctuation threshold, and the secondary side voltage fluctuation range does not exceed the second voltage fluctuation threshold, it is determined that the voltage regulation demand is no voltage regulation demand; If the primary side voltage fluctuation range does not exceed the first voltage fluctuation threshold, and the secondary side voltage fluctuation range exceeds the second voltage fluctuation threshold, the voltage regulation demand is determined based on the secondary side load voltage sequence; If the primary side voltage fluctuation range exceeds the first voltage fluctuation threshold, and the secondary side voltage fluctuation range exceeds the second voltage fluctuation threshold, the voltage regulation demand is determined based on the primary side grid voltage sequence.

[0044] In the embodiment, the voltage regulation demand is determined based on the secondary side load voltage sequence, specifically including: The secondary side load voltage sequence is divided into multiple window subsequences based on a sliding window, and the secondary side load voltage mean of each window subsequence is calculated; The difference between the secondary side voltage target value and each secondary side load voltage mean is calculated, all the differences are composed into a secondary side difference sequence, and the secondary side voltage trend feature is determined based on the secondary side difference sequence; The voltage regulation demand is determined based on the secondary side voltage trend feature and the secondary side difference sequence.

[0045] In the embodiment, the voltage regulation demand is determined based on the secondary side voltage trend feature and the secondary side difference sequence, specifically including: 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, it is determined that the voltage regulation demand is voltage reduction; the positive number indicates that the secondary side load voltage mean is greater than the secondary side voltage target value; the third difference threshold is a positive number and the third difference threshold is less than the first difference threshold; If the secondary voltage trend feature is a decreasing trend, and the last difference value in the secondary difference value sequence is less than the fourth difference value threshold, it is determined that the voltage regulating demand is step-up; the difference value is a negative number, indicating that the secondary load voltage average is less than the secondary voltage target value; the fourth difference value threshold is a negative number and greater than the second difference value threshold.

[0046] In the embodiment, the intelligent on-load voltage regulating switch control method further comprises: If the secondary voltage trend feature is an increasing trend, and the last difference value in the secondary difference value sequence is not greater than the third difference value threshold, it is determined that the voltage regulating demand is no voltage regulating demand.

[0047] If the secondary voltage trend feature is a decreasing trend, and the last difference value in the secondary difference value sequence is not less than the fourth difference value threshold, it is determined that the voltage regulating demand is no voltage regulating demand.

[0048] If the secondary voltage trend feature is a stable trend, it is determined that the voltage regulating demand is no voltage regulating demand.

[0049] When the secondary voltage trend feature is an increasing trend, and the last difference value in the secondary difference value sequence is not greater than the third difference value threshold, although the voltage is in an upward trend, the deviation does not reach the critical value (the third difference value threshold) for triggering step-down, and active step-down is not needed, so it can be determined that the voltage regulating demand is no voltage regulating demand, and the voltage sequence change is continuously monitored.

[0050] When the secondary voltage trend feature is a decreasing trend, and the last difference value in the secondary difference value sequence is not less than the fourth difference value threshold, although the voltage is in a downward trend, the deviation does not reach the critical value (the fourth difference value threshold) for triggering step-up, and active step-up is not needed, so it can be determined that the voltage regulating demand is no voltage regulating demand, and the voltage sequence change is continuously monitored.

[0051] When the secondary voltage trend feature is a stable trend, no matter what range the last difference value in the secondary difference value 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 is continuously monitored.

[0052] 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.

[0053] 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.

[0054] 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-adapted voltage regulation demand judgment, which can avoid invalid or excessive voltage regulation.

[0055] For example, the embodiment can obtain a primary side grid voltage sequence (1 second per acquisition, a total of 60 data, a primary side rated 10 kV) and a secondary side load voltage sequence (1 second per acquisition, a 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.

[0056] 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, it is determined that the fluctuation is from the grid side, and the demand needs to be determined 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 threshold, it is determined that the voltage regulation demand is no voltage regulation demand.

[0057] 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, the secondary side sequence is divided by using a sliding window, and three window subsequences are obtained. The average values of the window subsequences are calculated: 224 V for window 1, 225 V for window 2, and 226 V for window 3. Taking 220 V as the target value of the secondary side voltage, the difference between the target value and each average value is calculated to 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 adjacent difference values, and the trend lasts for three windows.

[0058] 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 average value of the voltage is greater than the target value, it is determined 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, and in combination with the negative difference value indicating that the average value of the voltage is less than the target value, it is determined 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.

[0059] 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 thresholds, 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, and lock the grid side when both sides exceed the threshold, 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.

[0060] 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.

[0061] 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 smaller than the first threshold can prevent slight positive deviation from triggering voltage reduction, and the fourth threshold greater 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] For example, the specific implementation process of determining the target voltage regulation parameter can include: 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 50A), and because 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.

[0067] 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: Determine the load rate based on the load data of the transformer, and determine the initial gear switching speed based on the load rate; the load rate and the initial gear switching speed are positively correlated; Calculate the ratio of the switching working current to the rated working current, and determine the current correction coefficient based on the ratio; Correct the initial gear switching speed based on the current correction coefficient to obtain the gear switching speed.

[0068] In the present embodiment, the load rate refers to the proportion of the real-time load 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.

[0069] The consideration behind the embodiment is that the load rate reflects the load bearing state of the transformer, and fast switching under heavy load can easily cause voltage fluctuation, so the embodiment sets the load rate to be positively correlated with the initial switching speed; considering that the switching working current is related to the operation load of the equipment, the switching protection device needs to be slowed down when the current is too high, and the embodiment adjusts the speed through the current correction coefficient to ensure that the switching is adapted to the load and the safety of the equipment is guaranteed.

[0070] For example, the embodiment can obtain the real-time load power in the transformer load data as 400 kVA, and the rated load power of the transformer is known to be 800 kVA, and the load rate is calculated as 400 kVA ÷ 800 kVA = 50%; the embodiment can obtain the initial gear switching speed corresponding to the 50% load rate as 200 ms / gear according to the preset load rate-initial speed mapping relationship.

[0071] The embodiment can obtain the switching working current of the voltage regulating switch as 30 A, and the rated working current of the switch is known to be 50 A, and the ratio of the two is calculated as 30 A ÷ 50 A = 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 that when the switching working current does not exceed the rated working current of the switch, the corresponding current correction coefficient is 1.0, and when the switching working current exceeds the rated working current of the switch, the corresponding current correction coefficient is 0.9.

[0072] The embodiment can multiply the initial gear switching speed 200 ms / gear by the current correction coefficient 1.0 to obtain 200 ms / gear x 1.0 = 200 ms / gear, which is the final gear switching speed used to control the voltage regulating switch.

[0073] For example, as shown in Figure 2 In the commonly used no-excitation switch 1, 1st gear: 3 and 4 are short-circuited, the secondary output voltage is 10500 V, which is the lowest; 2nd gear: 4 and 2 are short-circuited, the secondary output voltage is 10250 V; 3rd gear: 2 and 5 are short-circuited, the secondary output voltage is 10000 V; 4th gear: 5 and 1 are short-circuited, the secondary output voltage is 9750 V; 5th gear: 1 and 6 are short-circuited, the secondary output voltage is 9500 V, which is the highest; and 6 is connected to another phase as an output line.

[0074] In the commonly used no-excitation switch 2, 1st gear: X2 and X3 are short-circuited, the secondary output voltage is 10500 V, which is the lowest; 2nd gear: X3 and X4 are short-circuited, the secondary output voltage is 10250 V; 3rd gear: X4 and X5 are short-circuited, the secondary output voltage is 10000 V; 4th gear: X5 and X6 are short-circuited, the secondary output voltage is 9750 V; 5th gear: X6 and X7 are short-circuited, the secondary output voltage is 9500 V, which is the highest; and X7 is connected to another phase as an output line.

[0075] In the on-load voltage regulating switch, 1 gear: X2, X3 are short-circuited, 10500 V secondary output voltage is lowest; 2 gear: X3, X4 are short-circuited, 10250 V; 3 gear: X4, X5 are short-circuited, 10000 V; 4 gear: X5, X6 are short-circuited, 9750 V; 5 gear: X6, X7 are short-circuited, 9500 V, secondary output voltage is highest; A2 is connected to another phase as an output line.

[0076] 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.

[0077] 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 current to prevent impact. Finally, the on-load voltage regulating switch is ensured to complete gear switching smoothly and safely, the voltage is effectively maintained stable, and the equipment loss is reduced.

[0078] 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.

[0079] 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.

[0080] Considering that the insulation resistance of the vacuum bulb and the temperature of the voltage regulating switch are core factors affecting voltage regulating 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 a clear basis for whether the voltage regulating is allowed subsequently, and guarantees the safety of the equipment.

[0081] Exemplarily, the specific implementation process of fault determination on the vacuum bulb insulation data and the temperature of the voltage regulating switch can include: 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.

[0082] The embodiment can compare the insulation resistance value 750 MΩ with the first insulation threshold value 800 MΩ, and determine that there is a vacuum bulb insulation fault because 750 MΩ is less than 800 MΩ; compare the actual measured temperature with the switch temperature threshold value, and determine that there is no switch temperature fault because the body temperature 105 DEG C does not exceed 110 DEG C. The embodiment can determine the fault determination result as the vacuum bulb insulation fault by comprehensively determining the two types of results.

[0083] 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 stop of voltage regulation or maintenance, and effectively guarantee the safe operation of the voltage regulating switch.

[0084] 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.

[0085] 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. 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; 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 an insulation data of the vacuum bulb and a voltage regulation switch temperature of the voltage regulation switch; 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 extinguishing on an arc generated when the contact of the voltage regulation switch acts; if the fault determination result is no fault, acquire a switch working current of the voltage regulation switch, and perform overload determination on the switch working current to obtain an overload determination result; The voltage regulation control module 24 is configured to: if the overload determination result is no overload, acquire load data of the transformer and an 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.

[0086] 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 a secondary side load voltage mean value based on the secondary side load voltage sequence; and calculate a difference between the secondary side load voltage mean value and the secondary side voltage target value as the voltage deviation.

[0087] 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 grid voltage sequence and the secondary side load voltage sequence, is specifically configured to: calculate a primary side voltage fluctuation amplitude based on the primary side grid voltage sequence, and calculate 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 value, and the secondary side voltage fluctuation amplitude does not exceed a second voltage fluctuation threshold value, determine that the voltage regulation demand is no voltage regulation demand; 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; 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 grid voltage sequence.

[0088] 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: divide the secondary side load voltage sequence into a plurality of window subsequences based on a sliding window, and calculate a secondary side load voltage mean value of each window subsequence; determining a difference between each secondary-side load voltage average value and the 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 a voltage regulation demand based on the secondary-side voltage trend feature and the secondary-side difference value sequence.

[0089] 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 value sequence, the voltage regulation demand analysis module 22 is specifically configured to: 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; the 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; the 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.

[0090] 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.

[0091] 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. 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: 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; if the insulation resistance value of the vacuum bulb is less than the first insulation threshold, determining that the vacuum bulb insulation fault; if the voltage regulation switching temperature exceeds the switching temperature threshold, determining that the switching temperature fault.

[0092] Referring to Figure 6 ,Figure 6 A schematic block diagram of an electronic device is provided for an embodiment of the present application. As shown in the figure, the electronic device 300 in the embodiment can 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 above-mentioned processor 301, input device 302, output device 303, and memory 304 complete communication with each other through a communication bus 305. The memory 304 is configured to store a computer program, and the computer program includes program instructions. The processor 301 is configured to execute the program instructions stored in the memory 304. The processor 301 is configured to invoke the program instructions to execute the functions of the modules in each of the above-mentioned system embodiments, such as the functions of the data acquisition module 21, voltage regulation demand analysis module 22, safety determination module 23, and voltage regulation control module 24 shown in the figure. Figure 6 Figure 5

[0093] It should be understood that, in the embodiments of the present application, the processor 301 can be a central processing unit (CPU), and the processor can 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 gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0094] The input device 302 can include a touchpad, a fingerprint acquisition sensor (for acquiring fingerprint information and direction information of a fingerprint of a user), a microphone, etc., and the output device 303 can include a display (LCD, etc.), a speaker, etc.

[0095] The memory 304 can include read-only memory and random access memory, and provide instructions and data for the processor 301. A portion of the memory 304 can also include non-volatile random access memory. For example, the memory 304 can also store load type information.

[0096] In specific implementations, the processor 301, input device 302, and output device 303 described in the embodiments of the present application can execute 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 execute the implementation manners of the electronic device 300 described in the embodiments of the present application, which will not be described here.

[0097] ​​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, when executed by a processor, implement all or part of the processes of the above-mentioned embodiment methods. The computer program can also instruct related hardware to complete the implementation. 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 various method embodiments can be implemented. The computer program includes computer program code, which can be in the form of source code, object code, executable files, 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.

[0098] The computer readable storage medium can be an internal storage unit of the electronic device of any of the preceding 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.

[0099] Those skilled in the art can appreciate that the modules / units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in general terms in the above description. Whether the functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0100] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the electronic device and the units described above can refer to the corresponding processes in the above-mentioned method embodiments, which will not be described here.

[0101] In several embodiments provided in the present application, it should be understood that the disclosed electronic device and method can be implemented in other manners. For example, the division of the system embodiments described above is merely an example, and the division of the modules / units can be different, for example, a plurality of modules / units can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or communication connection between the modules / units can be indirect coupling or communication connection through some interfaces or modules / units, and can be electrical, mechanical or other forms of connection.

[0102] The modules / units described as separated components can or can not be physically separated, and the components displayed as modules / units can or can not be physical modules / units, i.e., can be located in one place or distributed on a plurality of network modules / units. Some or all of the modules / units can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0103] In addition, each functional module / unit in each embodiment of the present application can be integrated into a processing module / unit, or each module / unit can exist physically separately, or two or more modules / units can be integrated into 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.

[0104] The above is merely a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in 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 the voltage regulation demand as 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 the voltage regulation demand as 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 the fault determination result as 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 switch the tapping position 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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