A control method, device and electronic equipment for a single-phase capacity-adjusting transformer

Abstract

The present application provides a control method, device and electronic equipment for a single-phase capacity-adjusting transformer, which relates to the technical field of transformers. The method includes: collecting real-time power data generated by the single-phase capacity-adjusting transformer, which reflects the real-time input and real-time output of the single-phase capacity-adjusting transformer during operation; calculating the no-load loss and load loss corresponding to the single-phase capacity-adjusting transformer according to the real-time power data; generating a target capacity-adjusting instruction corresponding to the single-phase capacity-adjusting transformer according to the no-load loss and load loss; controlling the capacity-adjusting switch in the single-phase capacity-adjusting transformer to execute the target capacity-adjusting instruction to complete the switching control of the capacity of the single-phase capacity-adjusting transformer. The present application uses the actual no-load loss and load loss calculated in real time as the basis to determine whether the transformer needs to be adjusted, fundamentally solving the problem of accurate energy saving of the transformer and improving the accuracy of transformer capacity adjustment.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a control method, device and electronic equipment for a single-phase capacity-regulating transformer. Background Art

[0002] In urban commercial areas, development zones, industrial areas where the load varies greatly during the day and night, and in rural areas where the seasonal load varies greatly, the distribution transformer will experience the "big horse pulling a small cart" phenomenon during periods of light load, resulting in greater energy loss. The capacity-regulating transformer, as one of the distribution transformers, has two capacities, large and small. When the transformer is under light load, it switches to a small capacity to save energy.

[0003] At present, the capacity adjustment judgment basis of the capacity adjustment transformer is mainly based on the no-load and load loss parameters specified in the national standard of distribution transformers, and the critical point where the transformer is in the large and small capacity with equal energy loss is calculated. When the load is below this critical point, it switches to small capacity operation, and when it is greater than this critical point, it switches to large capacity operation. The no-load loss of the transformer in the national standard is the loss value corresponding to the input voltage being the rated value and the transformer being no-load. The load loss is the loss value corresponding to the transformer coil at the reference temperature, such as the oil-immersed transformer reference temperature of 75°C, when the coil flows through the rated current. Based on this situation, when calculating the critical point, it is assumed that the no-load loss of the transformer remains unchanged, and the actual load loss of the transformer changes according to the square relationship of the load rate.

[0004] However, in the above process, when the distribution transformer is actually in operation, the input voltage of the transformer actually changes in real time, and the temperature of the transformer coil will not operate at the reference temperature. This is related to the ambient temperature and the heat dissipation of the transformer. This determines that the selection of the transformer capacity adjustment point is not accurate, resulting in failure to achieve the ideal energy-saving effect. In other words, the accuracy and precision of the transformer capacity adjustment are reduced. Summary of the invention

[0005] In view of this, the purpose of this application is to at least provide a control method, device and electronic equipment for a single-phase capacity-adjusting transformer, which determines whether the transformer needs capacity adjustment based on the actual no-load loss and load loss calculated in real time, fundamentally solves the problem of precise energy saving of the transformer, and improves the accuracy of transformer capacity adjustment.

[0006] This application mainly includes the following aspects:

[0007] In a first aspect, an embodiment of the present application provides a control method for a single-phase capacity-regulating transformer, the method comprising: collecting real-time power data generated by the single-phase capacity-regulating transformer, the real-time power data reflecting the real-time input and real-time output of the single-phase capacity-regulating transformer during operation; calculating the no-load loss and load loss corresponding to the single-phase capacity-regulating transformer based on the real-time power data; generating a target capacity-regulating instruction corresponding to the single-phase capacity-regulating transformer based on the no-load loss and load loss; controlling the capacity-regulating switch in the single-phase capacity-regulating transformer to execute the target capacity-regulating instruction to complete the switching control of the capacity of the single-phase capacity-regulating transformer.

[0008] In a possible implementation, the real-time power data includes a high-voltage side voltage, a high-voltage side current, a low-voltage side voltage, and a low-voltage side current of a single-phase capacity-adjusting transformer, wherein the no-load loss corresponding to the single-phase capacity-adjusting transformer is determined by the following formula:

[0009]

[0010] In this formula, Indicates no-load loss, Indicates the high voltage side voltage, Indicates the high voltage side current, Indicates the low voltage side voltage, is the low voltage side current, for and The angle difference between Indicates the transformer ratio corresponding to the single-phase capacity-adjusting transformer; the load loss corresponding to the single-phase capacity-adjusting transformer is determined by the following formula:

[0011]

[0012] In this formula, represents the load loss, Indicates the high voltage side voltage and high voltage side current The angle difference between Indicates the low voltage side voltage and low voltage side current The angle difference between them.

[0013] In one possible implementation, the capacity adjustment instruction includes a capacity reduction instruction and a capacity increase instruction, wherein a target capacity adjustment instruction is determined in the following manner: obtaining the current capacity state of the single-phase capacity adjustment transformer; if the current capacity state of the single-phase capacity adjustment transformer is a large capacity state, and the no-load loss is greater than 4 times the load loss, then the capacity reduction instruction is determined as the target capacity adjustment instruction, and the capacity reduction instruction instructs the single-phase capacity adjustment transformer to switch to a small capacity state; when the capacity state of the single-phase capacity adjustment transformer is a small capacity state, and the load loss is greater than 4 times the no-load loss, then the capacity increase instruction is determined as the target capacity adjustment instruction, and the capacity increase instruction instructs the single-phase capacity adjustment transformer to switch to a large capacity state.

[0014] In a possible implementation, the target capacity adjustment instruction indicates the target capacity adjustment action to be performed by the capacity adjustment switch, and the capacity adjustment switch includes a high-voltage capacity adjustment switch connected to the high-voltage side winding of the single-phase capacity adjustment transformer and a low-voltage capacity adjustment switch connected to the low-voltage side winding of the single-phase capacity adjustment transformer, wherein the step of controlling the capacity adjustment switch in the single-phase capacity adjustment transformer to execute the target capacity adjustment instruction includes: controlling the high-voltage capacity adjustment switch to perform the target capacity adjustment action at the zero-crossing point of the high-voltage side current; controlling the low-voltage capacity adjustment switch to perform the target capacity adjustment action at the zero-crossing point of the low-voltage side current.

[0015] In a possible implementation, the high-voltage capacity-adjusting switch is controlled to perform a target capacity-adjusting action at the zero-crossing point of the high-voltage side current in the following manner: according to the target capacity-adjusting action, the target instruction execution time corresponding to the high-voltage capacity-adjusting switch is determined, the capacity-adjusting action corresponds to the instruction execution time one by one, the instruction execution time represents the time required for the capacity-adjusting switch to execute the instruction response, and the instruction response is the process from the receipt of the target capacity-adjusting instruction to the actual start of the action of the capacity-adjusting switch; the zero-crossing period of the high-voltage side current of the single-phase capacity-adjusting transformer is obtained; if it is determined that the target instruction execution time is less than or equal to the zero-crossing period, then starting from the zero-crossing time of the high-voltage side current, the instruction response is executed after a first target time, and the first target time is the difference between the zero-crossing period and the target instruction execution time; if it is determined that the target instruction execution time is greater than the zero-crossing period, then starting from the zero-crossing time of the high-voltage side current, the instruction response is executed after a second target time, and the second target time is the difference between twice the zero-crossing period and the target instruction execution time.

[0016] In a possible implementation, in the process of generating the target capacity adjustment instruction, the method also includes: determining whether the capacity state of the single-phase capacity adjustment transformer is currently in a small capacity state; when the capacity state of the single-phase capacity adjustment transformer is currently in a small capacity state, performing the following processing: if it is determined that the high-voltage side current is less than or equal to the small capacity rated current corresponding to the single-phase capacity adjustment transformer, then judging whether it is necessary to switch the single-phase capacity adjustment transformer to a large capacity state; if it is necessary to switch the single-phase capacity adjustment transformer to a large capacity state, then executing a capacity increase instruction generation process: setting the single-phase capacity adjustment transformer to a capacity to be increased state, and accumulating the duration of the single-phase capacity adjustment transformer in the capacity to be increased state, if the duration of the capacity to be increased state is greater than the capacity increase delay time setting value, then generating a capacity increase instruction; if it is determined that the high-voltage side current is greater than the transformer small capacity rated current, and the high-voltage side current is less than the maximum switchable current corresponding to the high-voltage capacity adjustment switch, then changing the capacity increase delay time according to the inverse time relationship in which the capacity increase delay time is inversely proportional to the current; when it is determined that the single-phase capacity adjustment transformer needs to be switched to a large capacity state, executing the capacity increase instruction generation process according to the changed capacity increase delay time setting value.

[0017] In a possible implementation, the method also includes: detecting whether the low-voltage side voltage is less than a preset under-voltage protection value; if it is determined that the low-voltage side voltage is less than the preset under-voltage protection value, locking the capacitor-adjusting switch to execute the capacitor-adjusting instruction; detecting whether the high-voltage side current is greater than the maximum switchable current corresponding to the high-voltage capacitor-adjusting switch; if it is determined that the high-voltage side current is greater than the maximum switchable current corresponding to the high-voltage capacitor-adjusting switch, it is determined that a short circuit occurs in the single-phase capacitor-adjusting transformer, and locking the capacitor-adjusting switch to execute the capacitor-adjusting instruction.

[0018] In one possible implementation, real-time power data is collected through a four-quadrant active and reactive power detection function, wherein the method further includes: if the calculated no-load loss and / or load loss is a negative value, taking the absolute value of the no-load loss and / or load loss, and using the processed no-load loss and load loss to generate a target capacity adjustment instruction.

[0019] In the second aspect, the embodiment of the present application also provides a control device for a single-phase capacity-regulating transformer, the device comprising: an acquisition module, used to acquire real-time power data generated by the single-phase capacity-regulating transformer, the real-time power data reflecting the real-time input and real-time output of the single-phase capacity-regulating transformer during operation; a calculation module, used to calculate the no-load loss and load loss corresponding to the single-phase capacity-regulating transformer according to the real-time power data; a generation module, used to generate a target capacity-regulating instruction corresponding to the single-phase capacity-regulating transformer according to the no-load loss and load loss; a capacity-regulating control module, used to control the capacity-regulating switch in the single-phase capacity-regulating transformer to execute the target capacity-regulating instruction to complete the switching control of the capacity of the single-phase capacity-regulating transformer.

[0020] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, the memory storing machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the single-phase capacity regulating transformer method in the above-mentioned first aspect or any possible implementation manner of the first aspect.

[0021] The embodiment of the present application provides a control method, device and electronic device for a single-phase capacity-adjusting transformer, the method comprising: collecting real-time power data generated by the single-phase capacity-adjusting transformer, the real-time power data reflecting the real-time input and real-time output of the single-phase capacity-adjusting transformer during operation; calculating the no-load loss and load loss corresponding to the single-phase capacity-adjusting transformer according to the real-time power data; generating a target capacity-adjusting instruction corresponding to the single-phase capacity-adjusting transformer according to the no-load loss and load loss; controlling the capacity-adjusting switch in the single-phase capacity-adjusting transformer to execute the target capacity-adjusting instruction to complete the switching control of the capacity of the single-phase capacity-adjusting transformer. The present application uses the actual no-load loss and load loss calculated in real time as the basis to determine whether the transformer needs to be adjusted, fundamentally solving the problem of accurate energy saving of the transformer and improving the accuracy of transformer capacity adjustment.

[0022] The benefits of this application are:

[0023] (1) The actual no-load loss and load loss values ​​of the transformer can be detected online in real time. The no-load loss and load loss values ​​calculated in real time can be used as the criterion for determining whether the transformer needs to be adjusted, thereby fundamentally solving the problem of accurate energy saving of the transformer.

[0024] (2) The capacitor-adjusting switch is controlled to start switching at the current zero point, so that the arc is minimized when the capacitor-adjusting switch is actuated, thereby maximizing the operating life of the capacitor-adjusting switch.

[0025] (3) The transformer capacity increase instruction delay time is designed to have an inverse time characteristic, which can enable the transformer to switch to high-capacity operation in a timely manner, reduce the increase in losses caused by transformer overload time, and avoid transformer damage.

[0026] (4) When the single-phase transformer is in an undervoltage or short-circuit state, the real-time increase or decrease capacity command of the capacity regulating switch is locked to avoid the capacity regulating switch from getting stuck or being damaged.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of a large capacity state of a single-phase capacity-adjusting transformer provided in an embodiment of the present application is shown;

[0030] Figure 2 A schematic diagram of a small capacity state of a single-phase capacity regulating transformer provided in an embodiment of the present application is shown;

[0031] Figure 3 A flow chart showing a control method for a single-phase capacity-adjusting transformer provided in an embodiment of the present application is shown;

[0032] Figure 4 An equivalent circuit of a single-phase capacity-adjusting transformer provided in an embodiment of the present application is shown;

[0033] Figure 5 A voltage vector diagram corresponding to a single-phase capacity-adjusting transformer provided in an embodiment of the present application is shown;

[0034] Figure 6 A functional module diagram of a control device for a single-phase capacity-adjusting transformer provided in an embodiment of the present application is shown;

[0035] Figure 7 A schematic structural diagram of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0036] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art, under the guidance of the content of the present application, can add one or more other operations to the flowchart, or remove one or more operations from the flowchart.

[0037] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0038] The capacity-adjusting transformer changes the connection mode of the transformer coil to reduce the no-load loss of the transformer when the transformer is converted to a small capacity, thereby reducing the transformer's operating loss. Specifically, the capacity-adjusting transformer changes the coil connection mode through a capacity-adjusting switch connected to the high-voltage side coil and the low-voltage side coil respectively. However, for the same load size, when the capacity-adjusting transformer operates in a small capacity state, the resistance of its coil becomes larger, thereby increasing the load loss of the capacity-adjusting transformer.

[0039] See also Figure 1 , Figure 1 The following is a schematic diagram showing a large capacity state of a single-phase capacity-adjusting transformer provided in an embodiment of the present application. Figure 2 , Figure 2 A schematic diagram of a small capacity state of a single-phase capacity regulating transformer provided in an embodiment of the present application is shown. Figure 1 and Figure 2 As shown, A and X respectively represent the two ends of the high-voltage side coil of the single-phase capacity-adjusting transformer, B and Y respectively represent the two ends of the low-voltage side coil of the single-phase capacity-adjusting transformer, KG represents the high-voltage capacity-adjusting switch in the high-voltage side coil of the single-phase capacity-adjusting transformer, and KL represents the low-voltage capacity-adjusting switch in the low-voltage side coil of the single-phase capacity-adjusting transformer. The high-voltage side coil of the single-phase capacity-adjusting transformer is divided into a plurality of high-voltage partial coils a1, and the connection mode between the plurality of high-voltage partial coils a1 is adjusted by controlling the high-voltage capacity-adjusting switch KG. Specifically, the connection mode includes series connection and parallel connection. Similarly, the low-voltage side coil of the single-phase capacity-adjusting transformer is divided into a plurality of low-voltage partial coils b1, and the connection mode between the plurality of low-voltage partial coils b1 is adjusted by controlling the low-voltage capacity-adjusting switch KL.

[0040] The high-voltage capacitor-adjusting switch KG includes a first high-voltage sub-capacitor-adjusting switch KG1, a second high-voltage sub-capacitor-adjusting switch KG2 and a third high-voltage sub-capacitor-adjusting switch KG3, and the low-voltage capacitor-adjusting switch KG includes a first low-voltage sub-capacitor-adjusting switch KG1, a second low-voltage sub-capacitor-adjusting switch KG2 and a third low-voltage sub-capacitor-adjusting switch KG3.

[0041] like Figure 1As shown, when the first high-voltage sub-capacitor-adjusting switch KG1 is closed, the second high-voltage sub-capacitor-adjusting switch KG2 is disconnected, and the third high-voltage sub-capacitor-adjusting switch KG3 is closed, the two high-voltage part coils a1 are in parallel state. Similarly, when the first low-voltage sub-capacitor-adjusting switch KG1 is closed, the second low-voltage sub-capacitor-adjusting switch KG2 is disconnected, and the third low-voltage sub-capacitor-adjusting switch KG3 is closed, the two low-voltage part coils b1 are in parallel state. When the connection modes between multiple high-voltage part coils a1 and multiple low-voltage part coils b1 are all in parallel state, the single-phase capacity-adjusting transformer is in a large capacity state.

[0042] like Figure 2 As shown, when the first high-voltage sub-capacitor-adjusting switch KG1 is disconnected, the second high-voltage sub-capacitor-adjusting switch KG2 is closed, and the third high-voltage sub-capacitor-adjusting switch KG3 is disconnected, the two high-voltage part coils a1 are in a series state. Similarly, when the first low-voltage sub-capacitor-adjusting switch KG1 is disconnected, the second low-voltage sub-capacitor-adjusting switch KG2 is closed, and the third low-voltage sub-capacitor-adjusting switch KG3 is disconnected, the two low-voltage part coils b1 are in a series state. When the connection modes between multiple high-voltage part coils a1 and multiple low-voltage part coils b1 are all in a series state, the single-phase capacity-adjusting transformer is in a small capacity state.

[0043] by Figure 1 and Figure 2 As an example, the single-phase capacity-adjusting transformer shown in the figure is Figure 1 The bulk state shown switches to Figure 2 In the small capacity state shown, both the high-voltage side coil AX and the low-voltage side coil BY of the single-phase capacity regulating transformer are changed from two parallel windings to series windings, so that the total number of turns of the transformer coil is doubled. From transformer knowledge, it can be known that the turn voltage of the transformer winding will become 1 / 2 of that of the large capacity, and the magnetic flux density in the transformer core will also become 1 / 2 of that of the large capacity.

[0044] According to transformer theory, core loss is proportional to the square of magnetic flux density. The transformer core loss (also known as no-load loss) will become 1 / 4 of that when the capacity is large, and the transformer coil resistance will become 4 times that of the large capacity due to changing from parallel to series connection. Therefore, the coil loss, also known as the load loss, will also increase to 4 times that of the large capacity.

[0045] When the transformer input voltage remains unchanged, the no-load loss of the transformer at large and small capacities will remain unchanged, and the actual load loss of the transformer will change according to the square relationship of the load rate. Therefore, there is a critical capacity conversion point. The current capacity adjustment judgment basis of the capacity-adjusting transformer is mainly based on the no-load and load loss parameters specified in the national standard for distribution transformers, and the critical capacity conversion point where the transformer is equal to the electric energy loss of large and small capacities is calculated. At this critical capacity conversion point, the total transformer loss (equal to the sum of the no-load loss and the actual load loss) when the transformer is running at a small capacity will be equal to the total transformer loss at a large capacity, that is, the total transformer loss. When the load capacity exceeds this critical capacity conversion point, the total loss is smaller when the transformer is running at a large capacity. On the contrary, when the load capacity is less than or equal to this critical capacity conversion point, the total loss is smaller when the transformer is running at a small capacity.

[0046] At present, the theoretical calculation formula of this critical capacity conversion point S is:

[0047] (1)

[0048] In formula (1), Indicates the rated no-load loss of the transformer under large capacity state. Indicates the rated no-load loss of the transformer under low capacity state. Indicates the rated load loss of the transformer under large capacity state. Indicates the rated load loss of the transformer under low capacity state. Indicates the rated capacity of the transformer in the large capacity state. It represents the rated capacity of the transformer under the low-capacity state. The above values ​​can be found in the national standard, such as GB 6451. The critical capacity conversion point S can be obtained by solving formula (1).

[0049] At present, single-phase capacity-adjusting transformers all use the above critical capacity conversion point or the expansion of the above formula when considering the reactive equivalent to determine whether the transformer should be increased or decreased in capacity to save energy.

[0050] However, the no-load loss of the transformer in the national standard is the loss value corresponding to the transformer no-load when the transformer input voltage is the rated value, and the load loss is the loss value measured when the transformer coil is at a reference temperature, such as 75°C for an oil-immersed transformer, and the rated current flows through it. However, when the distribution transformer is actually in operation, the input voltage actually changes in real time, and the temperature of the transformer coil will not operate at the reference temperature. This is related to the heat dissipation of the transformer at the ambient temperature. This determines that the existing adjustment of the corresponding capacity state of the single-phase capacity-regulating transformer is not accurate and cannot achieve the ideal energy-saving effect.

[0051] Based on this, the embodiments of the present application provide a control method, device and electronic device for a single-phase capacity-adjusting transformer, which determines whether the transformer needs capacity adjustment by calculating the actual no-load loss and load loss in real time, fundamentally solves the problem of accurate energy saving of the transformer, and improves the accuracy of transformer capacity adjustment, as follows:

[0052] See also Figure 3 , Figure 3 The flowchart of a control method of a single-phase capacity-adjusting transformer provided in an embodiment of the present application is shown. Figure 3 As shown, the method provided in the embodiment of the present application comprises the following steps:

[0053] S100, collecting real-time power data generated by the single-phase capacity-regulating transformer.

[0054] Real-time power data reflects the real-time input and real-time output of the single-phase capacity-regulating transformer during operation.

[0055] S200. Calculate the no-load loss and load loss corresponding to the single-phase capacity-adjusting transformer according to the real-time power data.

[0056] S300: Generate a target capacity adjustment instruction corresponding to the single-phase capacity adjustment transformer according to the no-load loss and the load loss.

[0057] S400, controlling the capacity regulating switch in the single-phase capacity regulating transformer to execute the target capacity regulating instruction to complete the switching control of the capacity of the single-phase capacity regulating transformer.

[0058] In step S100 to step S400 of the present application, the real-time power data includes but is not limited to at least one of the following items: the high-voltage side voltage, high-voltage side current, low-voltage side voltage and low-voltage side current of the single-phase capacity-adjusting transformer. Different capacity-adjusting actions performed by the corresponding capacity-adjusting switch are preset in the present application. The capacity-adjusting action includes a capacity-increasing switch action and a capacity-reducing switch action. Correspondingly, the capacity-adjusting instruction includes a capacity-increasing instruction corresponding to the capacity-increasing switch action and a capacity-reducing instruction corresponding to the capacity-reducing switch action. The target capacity-adjusting instruction is a capacity-increasing instruction or a capacity-reducing instruction. Different from the prior art that uses formula (1) to determine the voltage-increasing and voltage-reducing state of the transformer, the present application calculates the actual no-load loss and load loss of the single-phase capacity-adjusting transformer in real time through the power data collected online in real time, and determines the corresponding capacity-adjusting action of the single-phase capacity-adjusting transformer using the no-load loss and load loss calculated in real time. That is, the present application determines the capacity-adjusting action performed by the transformer in combination with the real-time power data when the real-time environment of the transformer is constantly changing, thereby realizing the capacity-adjusting control of the transformer more accurately and improving the accuracy of the capacity-adjusting control.

[0059] See also Figure 4 , Figure 4FIG. 1 shows an equivalent circuit of a single-phase capacity-adjusting transformer provided in an embodiment of the present application. Figure 4 In the equivalent circuit corresponding to the single-phase capacity-adjusting transformer shown in the figure, Indicates the high voltage side voltage (i.e. input voltage) of the single-phase capacity regulating transformer. Indicates the low voltage side voltage (i.e. output voltage) of the single-phase capacity regulating transformer. Indicates the actual excitation voltage, Indicates the high-voltage side current (i.e. input current) of the single-phase capacity-regulating transformer. Indicates the low-voltage side current (i.e. output current) of the single-phase capacity-regulating transformer. Indicates the actual excitation current, It represents the high voltage side impedance (i.e. input impedance) of the single-phase capacity regulating transformer. Represents the low-voltage side impedance (i.e. output impedance) of a single-phase capacity-regulating transformer. The excitation impedance of the single-phase capacity-regulating transformer, Indicates the transformation ratio of a single-phase capacity-regulating transformer. Indicates the impedance corresponding to the low voltage side winding Equivalent to the value on the high voltage side, Indicates the value of the low-voltage side voltage equivalent to the high-voltage side. Indicates the value of the low-voltage side current equivalent to the high-voltage side current.

[0060] In this application, the high voltage side impedance include Figure 1 or Figure 2 Resistance and reactance components of the medium and high voltage side coil AX, excitation impedance Including the resistance component corresponding to the hysteresis eddy current loss of the core of the single-phase capacity-adjusting transformer and the inductance component corresponding to the magnetizing capacity, the excitation impedance The real-time power corresponding to the resistance component in is the no-load loss of the single-phase capacity-adjusting transformer, and the low-voltage side impedance include Figure 1 or Figure 2 Resistance and reactance components of the medium and low voltage side coil BY, high voltage side impedance The power corresponding to the resistance component in the low-voltage side impedance The sum of the powers corresponding to the resistance components in is recorded as the load loss corresponding to the single-phase capacity-adjusting transformer. , , , It is obtained through mutual inductors installed at the input and output ends of the single-phase capacity-regulating transformer or by direct sampling.

[0061] The actual excitation voltage and the actual excitation current If available, the no-load loss corresponding to the single-phase capacity-adjusting transformer can be determined by the following formula :

[0062] (2)

[0063] In formula (2), Indicates the actual excitation voltage and the actual excitation current The angle difference between them.

[0064] However, the actual excitation voltage and the actual excitation current (i.e. no-load current) is a value in the equivalent circuit and cannot be directly measured when the transformer is running under load. Therefore, in actual situations, it is impossible to calculate the no-load loss according to the formula (2) corresponding to the definition of active power. .

[0065] In a preferred embodiment, the present application determines the no-load loss corresponding to the single-phase capacity-adjusting transformer by the following formula:

[0066] (3)

[0067] In formula (3), Indicates no-load loss, Indicates the high voltage side voltage, Indicates the high voltage side current, Indicates the low voltage side voltage, Indicates the low voltage side current, for and The angle difference between Indicates the transformation ratio corresponding to the single-phase capacity-regulating transformer.

[0068] In this application, for formula (3), since the high-voltage side winding and the low-voltage side winding capacity of the single-phase capacity-adjusting transformer are the same, Figure 4 As shown in the figure, when the high-voltage side winding and the low-voltage side winding are equivalent to the same-side winding, the high-voltage side impedance corresponding to the high-voltage side winding is The low-voltage side impedance corresponding to the low-voltage side winding The actual excitation current of the single-phase capacity-adjusting transformer is similar to the design. Very small, same as the high voltage side current can be neglected, therefore, Figure 4 The actual excitation voltage The high voltage side voltage and transformer output voltage The vector average of . See Figure 5 , Figure 5A voltage vector diagram corresponding to a single-phase capacity-regulating transformer provided in an embodiment of the present application is shown.

[0069] Similarly, according to Figure 4 It can be seen that the actual excitation current Therefore, formula (3) can be used to calculate the corresponding no-load loss under real-time power data .

[0070] In another preferred embodiment, the load loss corresponding to the single-phase capacity-adjusting transformer is determined by the following formula:

[0071] (4)

[0072] In formula (4), represents the load loss, Indicates the high voltage side voltage and high voltage side current The angle difference between Indicates the low voltage side voltage and low voltage side current The angle difference between them.

[0073] In formula (4), Indicates the total input power corresponding to the single-phase capacity-adjusting transformer, It indicates the total output power corresponding to the single-phase capacity-adjusting transformer, and the difference between the total input power and the total output power is the total loss corresponding to the single-phase capacity-adjusting transformer. The total loss is equal to the no-load loss. The difference between .

[0074] Specifically, in formula (3) and formula (4), , , and They are all sinusoidal quantities at industrial frequency. From mathematical knowledge, we can know that the addition and subtraction of sinusoidal quantities and the direct multiplication of sinusoidal quantities by constants are still sinusoidal quantities.

[0075] In a preferred embodiment, step S300 includes:

[0076] The current capacity state of the single-phase capacity-regulating transformer is obtained. If the current capacity state of the single-phase capacity-regulating transformer is a large capacity state and the no-load loss is greater than 4 times the load loss, the capacity reduction instruction is determined as the target capacity-regulating instruction, and the capacity reduction instruction instructs the single-phase capacity-regulating transformer to switch to a small capacity state. When the capacity state of the single-phase capacity-regulating transformer is a small capacity state and the load loss is greater than 4 times the no-load loss, the capacity increase instruction is determined as the target capacity-regulating instruction, and the capacity increase instruction instructs the single-phase capacity-regulating transformer to switch to a large capacity state.

[0077] In a specific embodiment, the no-load loss corresponding to the single-phase capacity-adjusting transformer is calculated. and load losses Afterwards, Figure 1 and Figure 2 The change rules of no-load loss and load loss before and after transformer capacity adjustment obtained by analysis show that, assuming that the no-load loss of a single-phase capacity adjustment transformer in a large capacity state is , load loss is When the single-phase capacity-adjusting transformer changes from a large capacity state to a small capacity state, the no-load loss will become / 4, the load loss will become 4× , when the sum of the two before and after capacity adjustment is equal, the following formula is listed:

[0078] (5)

[0079] From formula (5), we can see that When , formula (5) holds. > When the single-phase capacity-adjusting transformer is switched to a small capacity state, the capacity reduction instruction is determined as the target capacity-adjusting instruction to be executed by the capacity-adjusting switch. ≤ When the single-phase capacity-adjusting transformer is in operation, it should be operated in the large-capacity state.

[0080] That is to say, in this application, the capacity reduction judgment condition corresponding to the capacity reduction instruction is: under the premise that the current capacity state of the single-phase capacity regulating transformer is a large capacity state, if > , it is determined that the capacity reduction instruction is used as the target capacity adjustment instruction.

[0081] Similarly, assuming that the no-load loss of a single-phase capacity-adjusting transformer in a small capacity state is , load loss is When the single-phase capacity-adjusting transformer changes from a small capacity state to a large capacity state, the no-load loss will become 4× , the load loss will become / 4, when the sum of the two before and after capacity adjustment is equal, the following formula is listed:

[0082] (6)

[0083] From formula (6), we can see that When , formula (6) holds. > When the single-phase capacity-adjusting transformer is switched to the large capacity state, the capacity-increasing instruction is determined as the target capacity-adjusting instruction to be executed by the capacity-adjusting switch. ≤ When the single-phase capacity-adjusting transformer is in operation, it should be operated in a small capacity state.

[0084] In summary, when the current capacity state of the single-phase capacity regulating transformer is large capacity state, and >4 , then, the single-phase capacity-adjusting transformer should be adjusted to a small capacity state, and the capacity reduction instruction is determined as the target capacity-adjusting instruction. When the current capacity state of the single-phase capacity-adjusting transformer is a small capacity state, the capacity increase instruction is determined as the target capacity-adjusting instruction, and >4 , the single-phase capacity-adjusting transformer should be adjusted to a large capacity state.

[0085] The capacity increase judgment condition corresponding to the capacity increase instruction is: under the premise that the current capacity state of the single-phase capacity regulating transformer is a small capacity state, if >4 , it is determined that the capacity increase instruction is used as the target capacity adjustment instruction.

[0086] The target capacity adjustment instruction indicates the target action to be performed by the capacity adjustment switch, and the capacity adjustment switch includes a high-voltage capacity adjustment switch connected to the high-voltage side winding of the single-phase capacity adjustment transformer and a low-voltage capacity adjustment switch connected to the low-voltage side winding of the single-phase capacity adjustment transformer.

[0087] In a preferred embodiment, the step of controlling the capacity adjustment switch in the single-phase capacity adjustment transformer to execute the target capacity adjustment instruction includes:

[0088] The high-voltage capacitance regulating switch is controlled to perform the target capacitance regulating action at the zero-crossing point of the current on the high-voltage side, and the low-voltage capacitance regulating switch is controlled to perform the target capacitance regulating action at the zero-crossing point of the current on the low-voltage side.

[0089] In the present application, taking the high-voltage side of a single-phase capacity-regulating transformer as an example, the current on the high-voltage side is an industrial frequency sinusoidal current (alternating current). The characteristic of the industrial frequency sinusoidal current is that its magnitude and direction keep changing over and over again. The moment when the high-voltage side current is zero is defined as the high-voltage side current zero-crossing point. In the present application, by controlling the high-voltage capacity-regulating switch to perform the target capacity-regulating action at the high-voltage side current zero-crossing point, the arc can be minimized when the high-voltage capacity-regulating switch is operated, thereby maximizing the operating life of the capacity-regulating switch.

[0090] In a preferred embodiment, the high-voltage capacitance adjustment switch is controlled to perform the target capacitance adjustment action at the zero-crossing point of the high-voltage side current by the following method:

[0091] According to the target capacity adjustment action, the target instruction execution time corresponding to the high-voltage capacity adjustment switch is determined. The capacity adjustment action corresponds to the instruction execution time one by one. The instruction execution time represents the time required for the capacity adjustment switch to execute the instruction response. The instruction response is the process from the capacity adjustment switch receiving the target capacity adjustment instruction to the actual start of the action execution. The zero-crossing period of the high-voltage side current of the single-phase capacity adjustment transformer is obtained. If it is determined that the target instruction execution time is less than or equal to the zero-crossing period, the instruction response is executed after the first target time starting from the zero-crossing time of the high-voltage side current. The first target time is the difference between the zero-crossing period and the target instruction execution time. If it is determined that the target instruction execution time is greater than the zero-crossing period, the instruction response is executed after the second target time starting from the zero-crossing time of the high-voltage side current. The second target time is the difference between twice the zero-crossing period and the target instruction execution time.

[0092] In a specific embodiment, Figure 1 or Figure 2 Take the high-voltage capacity adjustment switch KG in the example, and define the time from the high-voltage capacity adjustment switch KG receiving the target capacity adjustment command to the actual start of the switch action as the command execution time Tg. The power frequency sine wave crosses zero once every 10ms, that is, the overcurrent cycle of the high-voltage side current is 10ms, then there is the following processing process:

[0093] When Tg≤10ms, the high-voltage side current starts from the zero-crossing time and executes the instruction response after 10ms-Tg. When Tg>10ms, the high-voltage side current starts from the zero-crossing time and executes the instruction response after 20ms-Tg, and so on.

[0094] Among them, the action interval between the low-voltage side switch KL and the high-voltage side switch KG of the single-phase capacity-regulating transformer is small. Therefore, when the high-voltage capacity-regulating switch and the low-voltage capacity-regulating switch are independently controlled, similar to the control process of the high-voltage capacity-regulating switch, the low-voltage capacity-regulating switch KL also performs the target capacity-regulating action according to the low-voltage side current zero-crossing time and the instruction execution time corresponding to the low-voltage capacity-regulating switch to ensure that the low-voltage side of the single-phase capacity-regulating transformer also acts when the current passes through zero. No further details are given here.

[0095] In a preferred embodiment, in the process of generating the target capacity adjustment instruction, the method further includes:

[0096] Determine whether the current capacity state of the single-phase capacity regulating transformer is a small capacity state. When the current capacity state of the single-phase capacity regulating transformer is a small capacity state, perform the following processing:

[0097] If it is determined that the high-voltage side current is less than or equal to the small-capacity rated current corresponding to the single-phase capacity-regulating transformer, it is determined whether the single-phase capacity-regulating transformer needs to be switched to the large-capacity state. If the single-phase capacity-regulating transformer needs to be switched to the large-capacity state, the capacity-up instruction generation process is executed: the single-phase capacity-regulating transformer is set to the state to be upgraded, and the duration of the single-phase capacity-regulating transformer in the state to be upgraded is accumulated. If the duration of the state to be upgraded is greater than the set value of the capacity-up delay time, an upgrade instruction is generated.

[0098] If it is determined that the current on the high-voltage side is greater than the rated current of the transformer's small capacity, and the current on the high-voltage side is less than the maximum switchable current corresponding to the high-voltage capacity-adjusting switch, the capacity-adjusting delay time is changed according to the inverse time relationship in which the capacity-adjusting delay time is inversely proportional to the current. When it is determined that the single-phase capacity-adjusting transformer needs to be switched to a large capacity state, the capacity-adjusting instruction generation process is executed according to the changed capacity-adjusting delay time.

[0099] In a specific embodiment, after determining that the single-phase capacity-adjusting transformer meets the capacity reduction judgment condition or the capacity increase judgment condition, it is determined that the single-phase capacity-adjusting transformer is in a state to be reduced or a state to be increased. The present application sets a capacity adjustment delay time, and the capacity adjustment delay time includes a capacity increase delay time and a capacity reduction delay time corresponding to the capacity increase instruction. The corresponding capacity increase instruction is generated only when the duration of the state to be reduced is greater than the capacity increase delay time, and the corresponding capacity reduction instruction is generated only when the duration of the state to be reduced is greater than the capacity reduction delay time. In the prior art, the capacity increase delay time and the capacity reduction delay time of the single-phase capacity-adjusting transformer are set to the same, so the control is relatively simple. However, when the single-phase capacity-adjusting transformer is suddenly overloaded, if the delay time is set too long, it will not only cause a sharp increase in transformer losses but also may burn the transformer.

[0100] Therefore, in the control method provided in this application, the capacity increase delay time is set to an inverse time characteristic, as follows:

[0101] When the current on the high-voltage side of the single-phase capacity-adjusting transformer is less than or equal to the small-capacity rated current, it is determined whether the single-phase capacity-adjusting transformer needs to be adjusted to a large-capacity state. If it is determined that the single-phase capacity-adjusting transformer needs to be adjusted to a large-capacity state, it is determined that the single-phase capacity-adjusting transformer is in a state to be upgraded at this time. It is then counted whether the duration of the state to be upgraded is greater than the set value of the upgrade delay time, and then a capacity upgrade instruction is generated.

[0102] When the maximum switchable current of the capacity regulating switch is greater than the current on the high-voltage side of the single-phase capacity regulating transformer and greater than the rated current of the small capacity, the capacity increasing delay time is changed according to the inverse time relationship in which the capacity increasing delay time is inversely proportional to the current; when it is determined that the single-phase capacity regulating transformer needs to be switched to a large capacity state, the capacity increasing instruction generation process is executed according to the changed capacity increasing delay time. Inverse time design is a common means for relay protection and will not be elaborated here.

[0103] Specifically, the present application designs the capacity increase delay time corresponding to the single-phase capacity regulating transformer as an inverse time characteristic, which can enable the transformer to switch to large-capacity operation in a timely manner, reduce the increase in losses caused by the transformer overload time, and avoid transformer damage.

[0104] In a preferred embodiment, the method further comprises:

[0105] Detect whether the voltage on the low-voltage side is less than the preset under-voltage protection value. If it is determined that the voltage on the low-voltage side is less than the preset under-voltage protection value, the capacity adjustment switch is locked to execute the capacity adjustment instruction. Detect whether the current on the high-voltage side is greater than the maximum switchable current corresponding to the high-voltage capacity adjustment switch. If it is determined that the current on the high-voltage side is greater than the maximum switchable current corresponding to the high-voltage capacity adjustment switch, it is determined that the single-phase capacity adjustment transformer is short-circuited, and the capacity adjustment switch is locked to execute the capacity adjustment instruction.

[0106] Specifically, the method provided in the present application can be applied to a capacity regulating controller. When the capacity regulating controller detects that the low-voltage side voltage of a single-phase capacity regulating transformer is lower than a preset undervoltage protection value corresponding to the capacity regulating controller, because the working power supply of the capacity regulating controller is connected from the low-voltage side of the single-phase capacity regulating transformer, when operating at this voltage, the capacity regulating switch will not be able to operate reliably and may easily become stuck, etc. Therefore, the capacity increasing and capacity decreasing actions corresponding to the capacity regulating switch are locked. Similarly, when the capacity regulating controller detects that the high-voltage side current of the transformer is greater than the maximum switchable current of the capacity regulating switch, it can be considered that the high-voltage side current at this time is a short-circuit current, and the capacity increasing and capacity decreasing actions corresponding to the capacity regulating switch are locked to avoid damage to the switch. At this time, the front-end equipment of the single-phase capacity regulating transformer is relied upon for protection, and the entire power supply circuit of the single-phase capacity regulating transformer is disconnected.

[0107] The current capacity-adjusting switches are mainly mechanical equipment, so their mechanical and electrical lifespans are limited. Therefore, the present application also provides a daily action limit for the capacity-adjusting switch. Before the capacity-adjusting switch performs each capacity-adjusting action, it is determined whether the current cumulative number of actions is greater than the action limit. If the current cumulative number of actions is greater than the action limit, the action is abandoned. This can avoid the problem of reduced service life of the capacity-adjusting switch due to frequent capacity adjustments, thereby effectively increasing the operating life of the equipment.

[0108] In another preferred embodiment, the real-time power data is collected by four-quadrant active and reactive power detection functions, wherein the method further comprises:

[0109] If the calculated no-load loss and / or load loss is a negative value, the absolute value of the no-load loss and / or load loss is taken, and the target capacity adjustment instruction is generated using the processed no-load loss and load loss.

[0110] The capacity regulating controller supports four-quadrant active and reactive power detection functions. The four-quadrant active and reactive power detection is a prior art and will not be described in detail. In addition, the single-phase capacity regulating transformer provided in the present application is applied to the reverse power supply location of the distributed power source (the single-phase capacity regulating transformer can be applied to the photovoltaic power generation at the load without miscalculation causing malfunction). When the distributed power source is reversely powered, the no-load loss and load loss corresponding to the single-phase capacity regulating transformer will be calculated. Negative values ​​will appear when calculating. At this time, taking the absolute values ​​of the no-load loss and the load loss can enable the control method provided in the present application to operate normally.

[0111] Based on the same application concept, the embodiment of the present application also provides a control device for a single-phase capacity-adjusting transformer corresponding to the control method for a single-phase capacity-adjusting transformer provided in the above embodiment. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the control method for a single-phase capacity-adjusting transformer in the above embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0112] See also Figure 6 , Figure 6 FIG. 1 shows a functional module diagram of a control device for a single-phase capacity-adjusting transformer provided in an embodiment of the present application. Figure 6 As shown, the device comprises:

[0113] The acquisition module 500 is used to acquire real-time power data generated by the single-phase capacity-regulating transformer. The real-time power data reflects the real-time input and real-time output of the single-phase capacity-regulating transformer during operation.

[0114] The calculation module 510 is used to calculate the no-load loss and load loss corresponding to the single-phase capacity-adjusting transformer according to the real-time power data.

[0115] The generating module 520 is used to generate a target capacity adjustment instruction corresponding to the single-phase capacity adjustment transformer according to the no-load loss and the load loss.

[0116] The capacity adjustment control module 530 is used to control the capacity adjustment switch in the single-phase capacity adjustment transformer to execute the target capacity adjustment instruction to complete the switching control of the capacity of the single-phase capacity adjustment transformer.

[0117] Based on the same application idea, please refer to Figure 7 , Figure 7 FIG. 1 shows a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 7 As shown, the electronic device 600 includes: a processor 610, a memory 620 and a bus 630. The memory 620 stores machine-readable instructions executable by the processor 610. When the electronic device 600 is running, the processor 610 and the memory 620 communicate through the bus 630. The machine-readable instructions are executed by the processor 610 when running, such as the steps of the control method of the single-phase capacity-adjusting transformer in any of the above-mentioned embodiments.

[0118] Based on the same application concept, an embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the single-phase capacity-adjusting transformer provided in the above embodiment are executed.

[0119] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0120] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0121] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0122] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

[0123] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A control method for a single-phase capacity-adjusting transformer, characterized in that: The method comprises: Collecting real-time power data generated by the single-phase capacity-adjusting transformer, wherein the real-time power data reflects the real-time input and real-time output of the single-phase capacity-adjusting transformer during operation; According to the real-time power data, calculating the no-load loss and load loss corresponding to the single-phase capacity-adjusting transformer; Generating a target capacity adjustment instruction corresponding to the single-phase capacity adjustment transformer according to the no-load loss and the load loss; Controlling the capacity adjustment switch in the single-phase capacity adjustment transformer to execute the target capacity adjustment instruction to complete the switching control of the capacity of the single-phase capacity adjustment transformer; The real-time power data includes the high-voltage side voltage, high-voltage side current, low-voltage side voltage and low-voltage side current of the single-phase capacity-adjusting transformer. The no-load loss corresponding to the single-phase capacity-adjusting transformer is determined by the following formula: In this formula, represents the no-load loss, represents the high voltage side voltage, represents the high voltage side current, represents the low voltage side voltage, represents the low voltage side current, for and The angle difference between Indicates the transformer ratio corresponding to the single-phase capacity-adjusting transformer; The load loss corresponding to the single-phase capacity-adjusting transformer is determined by the following formula: In this formula, represents the load loss, Indicates the high voltage side voltage and high voltage side current The angle difference between Indicates the low voltage side voltage and low voltage side current The angle difference between The capacity adjustment instruction includes a capacity reduction instruction and a capacity increase instruction. The target capacity adjustment instruction is determined in the following manner: Obtaining the current capacity state of the single-phase capacity-adjusting transformer; If the current capacity state of the single-phase capacity-adjusting transformer is a large capacity state, and the no-load loss is greater than 4 times the load loss, the capacity reduction instruction is determined as the target capacity-adjusting instruction, and the capacity reduction instruction instructs the single-phase capacity-adjusting transformer to be switched to a small capacity state; When the capacity state of the single-phase capacity-adjusting transformer is a small capacity state, and the load loss is greater than 4 times the no-load loss, the capacity increase instruction is determined as the target capacity adjustment instruction, and the capacity increase instruction instructs the single-phase capacity-adjusting transformer to switch to a large capacity state.

2. The method according to claim 1, characterized in that The target capacity adjustment instruction indicates the target capacity adjustment action to be performed by the capacity adjustment switch, and the capacity adjustment switch includes a high-voltage capacity adjustment switch connected to the high-voltage side winding of the single-phase capacity adjustment transformer and a low-voltage capacity adjustment switch connected to the low-voltage side winding of the single-phase capacity adjustment transformer. The step of controlling the capacity adjustment switch in the single-phase capacity adjustment transformer to execute the target capacity adjustment instruction includes: Controlling the high-voltage capacitance adjustment switch to perform the target capacitance adjustment action at the zero-crossing point of the high-voltage side current; The low-voltage capacitance regulating switch is controlled to perform the target capacitance regulating action at the zero-crossing point of the low-voltage side current.

3. The method according to claim 2, characterized in that The high-voltage capacitance adjustment switch is controlled to perform the target capacitance adjustment action at the zero-crossing point of the high-voltage side current by: According to the target capacity adjustment action, the target instruction execution time corresponding to the high-voltage capacity adjustment switch is determined. The capacity adjustment action corresponds to the instruction execution time one by one. The instruction execution time represents the time required for the capacity adjustment switch to execute the instruction response. The instruction response is the process from the capacity adjustment switch receiving the target capacity adjustment instruction to actually starting to execute the action. Obtaining the zero-crossing period of the high-voltage side current of the single-phase capacity-regulating transformer; If it is determined that the target instruction execution time is less than or equal to the zero-crossing period, the instruction response is executed after a first target time starting from the zero-crossing time of the high-voltage side current, where the first target time is the difference between the zero-crossing period and the target instruction execution time; If it is determined that the target instruction execution time is greater than the zero-crossing period, the instruction response is executed after a second target time starting from the zero-crossing time of the high-voltage side current, and the second target time is the difference between twice the zero-crossing period and the target instruction execution time.

4. The method according to claim 1, characterized in that: In the process of generating the target capacity adjustment instruction, the method further includes: Determine whether the current capacity state of the single-phase capacity-adjusting transformer is a small capacity state; When the current capacity state of the single-phase capacity-adjusting transformer is a small capacity state, the following processing is performed: If it is determined that the high-voltage side current is less than or equal to the small-capacity rated current corresponding to the single-phase capacity-adjusting transformer, it is determined whether the single-phase capacity-adjusting transformer needs to be switched to a large-capacity state; If the single-phase capacity-adjusting transformer needs to be switched to a large-capacity state, a capacity-increasing instruction generation process is executed: the single-phase capacity-adjusting transformer is set to a state to be increased, and the duration of the single-phase capacity-adjusting transformer in the state to be increased is accumulated. If the duration of the state to be increased is greater than the set value of the capacity-increasing delay time, an increase instruction is generated; If it is determined that the high-voltage side current is greater than the rated current of the transformer with small capacity, and the high-voltage side current is less than the maximum switchable current corresponding to the high-voltage capacity regulating switch, the capacity increasing delay time is changed according to the inverse time relationship that the capacity increasing delay time is inversely proportional to the current; When it is determined that the single-phase capacity regulating transformer needs to be switched to a large capacity state, the capacity increasing instruction generation process is executed according to the changed capacity increasing delay time.

5. The method according to claim 1, characterized in that The method further comprises: Detecting whether the low-voltage side voltage is less than a preset undervoltage protection value; If it is determined that the low-voltage side voltage is less than the preset undervoltage protection value, the capacitance adjustment switch is locked to execute the capacitance adjustment instruction; Detecting whether the high-voltage side current is greater than the maximum switchable current corresponding to the high-voltage capacitance regulating switch; If it is determined that the high-voltage side current is greater than the maximum switchable current corresponding to the high-voltage capacity-adjusting switch, it is determined that the single-phase capacity-adjusting transformer is short-circuited, and the capacity-adjusting switch is locked to execute the capacity-adjusting instruction.

6. The method according to claim 1, characterized in that The real-time power data is collected through the four-quadrant active and reactive power detection function. Wherein, the method further comprises: If the calculated no-load loss and / or load loss is a negative value, the absolute value of the no-load loss and / or load loss is taken, and the target capacity adjustment instruction is generated using the processed no-load loss and load loss.

7. A control device for a single-phase capacity-adjusting transformer, characterized in that: The device comprises: A collection module, used to collect real-time power data generated by the single-phase capacity-adjusting transformer, wherein the real-time power data reflects the real-time input and real-time output of the single-phase capacity-adjusting transformer during operation; A calculation module, used for calculating the no-load loss and load loss corresponding to the single-phase capacity-adjusting transformer according to the real-time power data; A generating module, configured to generate a target capacity adjustment instruction corresponding to the single-phase capacity adjustment transformer according to the no-load loss and the load loss; A capacity adjustment control module, used to control the capacity adjustment switch in the single-phase capacity adjustment transformer to execute the target capacity adjustment instruction, so as to complete the switching control of the capacity of the single-phase capacity adjustment transformer; The real-time power data includes the high-voltage side voltage, high-voltage side current, low-voltage side voltage and low-voltage side current of the single-phase capacity-adjusting transformer. The calculation module is also used to determine the no-load loss corresponding to the single-phase capacity-adjusting transformer by the following formula: In this formula, represents the no-load loss, represents the high voltage side voltage, represents the high voltage side current, represents the low voltage side voltage, represents the low voltage side current, for and The angle difference between Indicates the transformer ratio corresponding to the single-phase capacity-adjusting transformer; The load loss corresponding to the single-phase capacity-adjusting transformer is determined by the following formula: In this formula, represents the load loss, Indicates the high voltage side voltage and high voltage side current The angle difference between Indicates the low voltage side voltage and low voltage side current The angle difference between The capacity adjustment instruction includes a capacity reduction instruction and a capacity increase instruction. The generating module is further configured to determine the target capacity adjustment instruction in the following manner: Obtaining the current capacity state of the single-phase capacity-adjusting transformer; If the current capacity state of the single-phase capacity-adjusting transformer is a large capacity state, and the no-load loss is greater than 4 times the load loss, the capacity reduction instruction is determined as the target capacity-adjusting instruction, and the capacity reduction instruction instructs the single-phase capacity-adjusting transformer to be switched to a small capacity state; When the capacity state of the single-phase capacity-adjusting transformer is a small capacity state, and the load loss is greater than 4 times the no-load loss, the capacity increase instruction is determined as the target capacity adjustment instruction, and the capacity increase instruction instructs the single-phase capacity-adjusting transformer to switch to a large capacity state.

8. An electronic device, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method of the single-phase capacity-adjusting transformer as described in any one of claims 1 to 6.

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