A control method and device for automatic voltage regulation of low voltage lines

Abstract

The present invention discloses a control method and device for automatic voltage regulation of low-voltage lines, and relates to the technical field of power grids. The control method for automatic voltage regulation includes: obtaining the input voltage of the line input end, calculating the voltage difference between the input voltage and a preset voltage threshold, and performing voltage regulation operation on the low-voltage line according to the voltage difference; detecting the load current of the output end of the low-voltage line after the voltage regulation operation, and calculating the actual output voltage of the output end of the low-voltage line based on the load current; extracting the actual output voltage after each voltage regulation operation within a detection cycle, arranging to obtain a sample data set, and calculating the voltage regulation error coefficient of the low-voltage line according to the sample data set; adjusting the preset voltage threshold according to the voltage regulation error coefficient, and generating the preset voltage threshold of the next detection cycle. By detecting and adjusting the voltage regulation operation of the voltage regulation working circuit of the low-voltage line, the stability and reliability of the voltage output of the low-voltage line are improved, and the voltage stabilization output effect of the low-voltage line is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grids, and in particular to a control method and device for automatic voltage regulation of low-voltage lines. Background Art

[0002] At present, power quality problems of high or low voltage often occur in the power supply of distribution network. This is mainly because the distribution network covers a wide range. When the power is transmitted over long distances and connected to the low-voltage line, power fluctuations are prone to occur. When the power consumption of users increases, the peak-to-valley difference is large, and the line voltage fluctuates greatly. The existing low-voltage line uses a series transformer step adjustment scheme to set multiple gears in the adjustment coil, and changes the transformer ratio by switching on and off the AC contactor or power electronic switch to achieve the purpose of line voltage regulation. However, this method cannot achieve stable voltage output. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art. The present invention provides a control method and device for automatic voltage regulation of a low-voltage line. By setting a voltage regulation working circuit in the low-voltage line and detecting and adjusting the voltage regulation operation of the voltage regulation working circuit according to the operation of the low-voltage line, the stability and reliability of the voltage output of the low-voltage line are improved, and the stable voltage output effect of the low-voltage line is achieved.

[0004] The present invention provides a control method for automatic voltage regulation of a low voltage line, the control method for automatic voltage regulation comprising:

[0005] S11: acquiring an input voltage at a line input terminal, calculating a voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference;

[0006] S12: Detecting a load current at the output end of the low-voltage circuit after the voltage regulation operation, and calculating an actual output voltage at the output end of the low-voltage circuit based on the load current;

[0007] S13: extracting the actual output voltage after each voltage regulation operation is completed within a detection cycle, arranging to obtain a sample data set, and calculating the voltage regulation error coefficient of the low-voltage line according to the sample data set;

[0008] S14: adjusting the preset voltage threshold according to the voltage regulation error coefficient to generate a preset voltage threshold for the next detection cycle.

[0009] Furthermore, the step of obtaining an input voltage at the line input terminal, calculating a voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference comprises:

[0010] It is detected whether the voltage difference is less than 0. If so, the voltage regulating working circuit of the low-voltage line is connected, and the voltage regulating operation is performed on the low-voltage line based on the voltage regulating working circuit.

[0011] Further, whether the detection voltage difference is less than 0, if so, connecting the voltage regulation working circuit of the low voltage line, and performing voltage regulation operation on the low voltage line based on the voltage regulation working circuit includes:

[0012] Calculating the voltage regulation control voltage based on the turns ratio of the voltage regulation coil of the voltage regulation working circuit and in combination with the voltage difference;

[0013] A control angle is calculated based on the voltage regulation control voltage, and a voltage regulation instruction of the voltage regulation working circuit is generated based on the control angle.

[0014] Further, based on the turns ratio of the voltage regulating coil of the voltage regulating working circuit, the voltage regulating control voltage is calculated in combination with the voltage difference, including:

[0015] The calculation formula of the voltage regulation control voltage is:

[0016] ;

[0017] ;

[0018] in, To regulate the control voltage, is the number of turns of the input end of the voltage regulating coil, n2 is the number of turns of the output end of the voltage regulating coil, is the voltage difference, is the input voltage at the input terminal, is the preset voltage threshold.

[0019] Furthermore, the step of acquiring the input voltage of the line input terminal, calculating the voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference further includes:

[0020] It is detected whether the voltage difference is less than 0. If not, the bypass working circuit of the low-voltage line is connected and the voltage regulating working circuit of the low-voltage line is disconnected to achieve normal operation of the low-voltage line.

[0021] Furthermore, the detecting a load current at the output end of the low-voltage circuit after the voltage regulation operation and calculating the actual output voltage at the output end of the low-voltage circuit based on the load current comprises:

[0022] Obtaining the load current at the output end of the low voltage line after the voltage regulation operation based on the ammeter;

[0023] The voltage regulation working impedance of the low voltage line is obtained, and the actual output voltage of the load end is calculated based on the voltage regulation working impedance adjustment combined with the load current.

[0024] Furthermore, the actual output voltage after each voltage regulation operation is completed within a detection cycle is extracted, and a sample data set is obtained by sorting, and the voltage regulation error coefficient of the low-voltage line is calculated according to the sample data set, including:

[0025] Setting a detection cycle, obtaining the number of voltage regulation operations within the detection cycle, and obtaining the actual output voltage after each voltage regulation operation, setting the actual output voltage as sample data, and constructing a sample data set;

[0026] The rated output voltage of the low-voltage circuit is set as standard data, and the voltage regulation error coefficient of the sample data set is calculated according to the standard data to obtain the voltage regulation error coefficient of the low-voltage circuit.

[0027] Furthermore, the rated output voltage of the low-voltage line is set as standard data, and the voltage regulation error coefficient is calculated for the sample data set according to the standard data, and obtaining the voltage regulation error coefficient of the low-voltage line includes:

[0028] The calculation formula of the voltage regulation error coefficient is:

[0029] ;

[0030] in, is the voltage regulation error coefficient, is the actual output voltage of the i-th sample data in the sample data set, is the rated output voltage of the low voltage line, is the average output voltage of the sample data set, is the number of sample data in the sample data set, is a constant, and .

[0031] Furthermore, the adjusting the preset voltage threshold according to the voltage regulation error coefficient to generate the preset voltage threshold of the next detection cycle includes:

[0032] The calculation formula for the preset voltage threshold of the next detection cycle is:

[0033] ;

[0034] in, is the preset voltage threshold for the next detection cycle, is the preset voltage threshold of the current detection cycle, is the voltage regulation error coefficient.

[0035] The present invention also provides a control device for automatic voltage regulation of a low-voltage line, the control device comprising:

[0036] The difference calculation module is used to obtain the input voltage of the line input terminal, calculate the voltage difference between the input voltage and the preset voltage threshold, and perform voltage regulation operation on the low voltage line according to the voltage difference;

[0037] Voltage detection module: used to detect the load current of the output end of the low-voltage line after the voltage regulation operation, and calculate the actual output voltage of the output end of the low-voltage line based on the load current;

[0038] Error calculation module: used to extract the actual output voltage after each voltage regulation operation is completed within a detection cycle, sort out the sample data set, and calculate the voltage regulation error coefficient of the low-voltage line according to the sample data set;

[0039] Threshold updating module: used to adjust the preset voltage threshold according to the voltage regulation error coefficient to generate the preset voltage threshold for the next detection cycle.

[0040] The present invention provides a control method and device for automatic voltage regulation of a low-voltage line. A voltage regulation working circuit is provided in the low-voltage line, and the voltage at the input end of the low-voltage line is detected in real time. The input voltage at the input end of the low-voltage line is compared with a preset voltage threshold, and voltage compensation is performed on the input voltage through the voltage regulation working circuit to achieve a stable voltage output of the low-voltage line. The voltage regulation operation of the voltage regulation working circuit is detected and adjusted according to the operation of the low-voltage line, thereby improving the stability and reliability of the voltage output of the low-voltage line. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 is a flow chart of a control method for automatic voltage regulation of a low voltage line in an embodiment of the present invention;

[0042] Figure 2 Schematic diagram of the line connection structure of the low-voltage line in an embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of a control device for automatic voltage regulation of a low-voltage line in an embodiment of the present invention. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Embodiment 1:

[0046] Figure 1 The flowchart of the control method for automatic voltage regulation of a low voltage line in an embodiment of the present invention is shown. Figure 2 A schematic diagram of the line connection structure of a low-voltage line in an embodiment of the present invention is shown, wherein the low-voltage line includes an input end, an output end, a voltage regulation working circuit and a bypass working circuit, wherein the input end of the low-voltage line is connected to the output end of the high-voltage power grid so that the low-voltage line can receive current input from the high-voltage power grid, and the output end of the low-voltage line is connected to a transformer assembly, and the transformer assembly converts the high-voltage current passing through the low-voltage line into a low-voltage current to meet the power demand of the load device.

[0047] Specifically, the voltage regulating working circuit and the bypass working circuit are designed in parallel, and the low-voltage line also includes a bypass switch K1 and a voltage regulating switch K2. The bypass switch K1 is arranged on the bypass working circuit, and the voltage regulating switch K2 is arranged on the voltage regulating working circuit. The conduction and disconnection of the bypass working circuit are controlled based on the bypass switch K1. When the bypass switch K1 is in a closed state, the bypass working circuit of the low-voltage line is in a conducting state, so that the output terminal voltage of the low-voltage line is the same as the input terminal voltage, that is, the high-voltage current output by the high-voltage power grid can enter the transformer assembly through the low-voltage line and be converted into a low-voltage current to meet the use requirements of the load equipment.

[0048] Based on the voltage regulating switch K2 controlling the on and off of the voltage regulating working circuit, when the voltage regulating switch K2 is in the on state, the voltage regulating working circuit is in the on state, so that the voltage regulating working circuit can output a voltage regulating control voltage, so that the input end voltage of the low-voltage line and the voltage regulating control voltage can be added to form the output end voltage of the low-voltage line, based on the voltage regulating working circuit.

[0049] Furthermore, the bypass switch K1 and the voltage regulating switch K2 are interlocking switches. When the bypass switch K1 is in a closed state, the voltage regulating switch K2 is in an open state. When the bypass switch K1 is switched from a closed state to an open state, the voltage regulating switch K2 can start to operate synchronously with the action of the bypass switch K1, so that the voltage regulating switch K2 can switch from an open state to a closed state.

[0050] Based on the linkage design of the bypass switch K1 and the voltage regulating switch K2, when the bypass working circuit is turned on, the voltage regulating working circuit can be in an open circuit state, or when the bypass working circuit is in an open circuit state, the voltage regulating working circuit can be in an on state, thereby avoiding mutual interference between the voltage regulating working circuit and the bypass working circuit and ensuring the normal operation of the low-voltage line.

[0051] Specifically, the automatic voltage regulation control method includes:

[0052] S11: acquiring an input voltage at a line input terminal, calculating a voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference.

[0053] Specifically, the low-voltage line is provided with a voltage regulating working circuit, and the voltage regulating working circuit is provided with a voltage regulating coil and two thyristors. The two thyristors are connected in series with the voltage regulating coil in an anti-parallel manner. By connecting the two thyristors in anti-parallel and then in series in the voltage regulating circuit, and by controlling the conduction and closing of the thyristors, convenient adjustment of the effective value of the output voltage of the voltage regulating working circuit can be achieved.

[0054] Specifically, the step of acquiring the input voltage of the line input terminal, calculating the voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference includes:

[0055] The difference between the input voltage and the preset voltage threshold is calculated to obtain the voltage difference between the input voltage and the preset voltage threshold, and it is detected whether the voltage difference is less than 0. If so, the voltage regulation working circuit of the low-voltage line is connected, and the voltage regulation operation is performed on the low-voltage line based on the voltage regulation working circuit. According to the voltage difference between the input voltage and the preset voltage threshold, a compensation voltage can be generated at the output end of the low-voltage line through the voltage regulation working circuit, so that the input voltage at the input end of the low-voltage line can be added to the compensation voltage, thereby ensuring that the output voltage at the output end of the low-voltage line meets the power voltage demand of the load equipment.

[0056] Specifically, whether the detection voltage difference is less than 0, if so, connecting the voltage regulation working circuit of the low voltage line, and performing voltage regulation operation on the low voltage line based on the voltage regulation working circuit includes:

[0057] The voltage regulation control voltage is calculated based on the turns ratio of the voltage regulating coil of the voltage regulation working circuit in combination with the voltage difference; the voltage regulation control voltage is calculated based on the turns ratio of the input end coil and the output end line of the voltage regulating coil in the voltage regulation working circuit in combination with the voltage difference; the voltage difference is used as the output voltage of the voltage regulating coil of the voltage regulation working circuit, that is, the compensation voltage of the voltage regulation working circuit, so that the low voltage line can achieve a regulated output based on the compensation voltage.

[0058] A control angle is calculated based on the voltage regulation control voltage, a voltage regulation instruction of a voltage regulation working circuit is generated based on the control angle, a thyristor voltage regulation gear of the voltage regulation working circuit is selected according to the coil turns ratio of the voltage regulation coil of the voltage regulation working circuit, and a control angle of the thyristor of the voltage regulation working circuit is calculated according to the voltage regulation control voltage.

[0059] Furthermore, the control angle calculation formula of the thyristor is:

[0060] ;

[0061] in, is the control angle, To regulate the control voltage, is the input voltage, is the voltage-to-current ratio of the thyristor.

[0062] The control angle of the thyristor of the voltage regulating working circuit is calculated based on the voltage regulating control voltage. Based on the control angle and the turns ratio of the voltage regulating coil of the voltage regulating working circuit, the output voltage of the voltage regulating working circuit can be accurately adjusted to meet the voltage stabilization output requirement of the low-voltage coil.

[0063] Specifically, calculating the voltage regulation control voltage based on the turns ratio of the voltage regulation coil of the voltage regulation working circuit and in combination with the voltage difference includes:

[0064] The calculation formula of the voltage regulation control voltage is:

[0065] ;

[0066] ;

[0067] in, To regulate the control voltage, is the number of turns of the input end of the voltage regulating coil, n2 is the number of turns of the output end of the voltage regulating coil, is the voltage difference, is the input voltage at the input terminal, is the preset voltage threshold.

[0068] Specifically, the acquiring of the input voltage at the line input terminal, calculating the voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference further includes:

[0069] It is detected whether the voltage difference is less than 0. If not, the bypass working circuit of the low-voltage line is connected and the voltage regulating working circuit of the low-voltage line is disconnected to achieve normal operation of the low-voltage line.

[0070] S12: Detecting a load current at the output end of the low-voltage line after the voltage regulation operation, and calculating an actual output voltage at the output end of the low-voltage line based on the load current.

[0071] Specifically, after the voltage regulating working circuit performs voltage regulation on the output end voltage of the low-voltage circuit, the load current at the output end of the low-voltage circuit after the voltage regulation operation is obtained. Based on the load current, the actual output voltage of the low-voltage circuit after each voltage regulation operation by the voltage regulating working circuit can be calculated, so as to detect whether the low-voltage circuit meets the voltage stabilization output requirements.

[0072] Specifically, detecting a load current at the output end of the low-voltage circuit after the voltage regulation operation, and calculating the actual output voltage at the output end of the low-voltage circuit based on the load current includes:

[0073] Based on the ammeter obtaining the load current at the output end of the low-voltage circuit after the voltage regulation operation, when the voltage regulation working circuit completes a voltage regulation operation, the output end voltage of the low-voltage circuit, that is, the load current of the low-voltage circuit, is obtained through the ammeter to calculate the output voltage of the low-voltage circuit.

[0074] The voltage regulation working impedance of the low voltage line is obtained, and the actual output voltage of the load end is calculated based on the voltage regulation working impedance adjustment combined with the load current.

[0075] The calculation formula of the actual output voltage is:

[0076] ;

[0077] in, is the actual output voltage, is the load current, It is the working impedance of voltage regulation.

[0078] Specifically, when the low-voltage line operates for a long time, the working impedance of the voltage regulating working circuit in the low-voltage line changes, that is, the low-voltage line is prone to impedance changes caused by aging of wires and devices after working for a long time. The actual output voltage of the low-voltage line after the voltage regulation operation is detected and calculated.

[0079] S13: extracting the actual output voltage after each voltage regulation operation is completed within a detection cycle, sorting out to obtain a sample data set, and calculating the voltage regulation error coefficient of the low-voltage line according to the sample data set.

[0080] A detection cycle is set, the number of voltage regulation operations within the detection cycle is obtained, and the actual output voltage after each voltage regulation operation is obtained, the actual output voltage is set as sample data, and a sample data set is constructed.

[0081] In this embodiment, the detection period is set to 15 days to ensure that the low-voltage line can operate continuously. Since the impedance of the voltage regulation working circuit of the low-voltage line changes little, setting a long detection period can improve the detection reliability of the voltage stabilization output of the low-voltage line.

[0082] The rated output voltage of the low-voltage circuit is set as standard data, and the voltage regulation error coefficient of the sample data set is calculated according to the standard data to obtain the voltage regulation error coefficient of the low-voltage circuit.

[0083] The calculation formula of the voltage regulation error coefficient is:

[0084] ;

[0085] in, is the voltage regulation error coefficient, is the actual output voltage of the i-th sample data in the sample data set, is the rated output voltage of the low voltage line, is the average output voltage of the sample data set, is the number of sample data in the sample data set, is a constant, and .

[0086] Specifically, the mean data of the sample data in the sample data set is analyzed with the standard data, and the voltage regulation error coefficient between the low-voltage line output voltage data and the rated output voltage data within the detection period is obtained by analyzing the deviation between each sample data and the mean data, and the deviation between each sample data and the rated output voltage.

[0087] S14: adjusting the preset voltage threshold according to the voltage regulation error coefficient to generate a preset voltage threshold for the next detection cycle.

[0088] The calculation formula for the preset voltage threshold of the next detection cycle is:

[0089] ;

[0090] in, is the preset voltage threshold for the next detection cycle, is the preset voltage threshold of the current detection cycle, is the voltage regulation error coefficient.

[0091] Specifically, an error coefficient analysis is performed based on the actual output voltage of the voltage regulating working circuit of the low-voltage line during the detection period in combination with the rated output voltage of the low-voltage line, and the preset voltage threshold of the next period is adjusted based on the voltage regulation error coefficient, so that the compensation voltage output by the voltage regulating working circuit is more accurate, ensuring that the output end of the low-voltage line can achieve a stable output voltage to meet the load usage requirements.

[0092] The present invention provides a control method and device for automatic voltage regulation of a low-voltage line. A voltage regulation working circuit is provided in the low-voltage line, and the voltage at the input end of the low-voltage line is detected in real time. The input voltage at the input end of the low-voltage line is compared with a preset voltage threshold, and voltage compensation is performed on the input voltage through the voltage regulation working circuit to achieve a stable voltage output of the low-voltage line. The voltage regulation operation of the voltage regulation working circuit is detected and adjusted according to the operation of the low-voltage line, thereby improving the stability and reliability of the voltage output of the low-voltage line.

[0093] Embodiment 2:

[0094] Figure 3 A schematic diagram of a control device for automatic voltage regulation of a low-voltage line in an embodiment of the present invention is shown. The low-voltage line includes: an input end, an output end, a voltage regulation working circuit and a bypass working circuit. The input end of the low-voltage line is connected to the output end of the high-voltage power grid, so that the low-voltage line can receive current input from the high-voltage power grid. The output end of the low-voltage line is connected to a transformer component, and the transformer component converts the high-voltage current passing through the low-voltage line into a low-voltage current to meet the power demand of the load device.

[0095] The control device comprises:

[0096] The difference calculation module 10 is used to obtain the input voltage of the line input terminal, calculate the voltage difference between the input voltage and a preset voltage threshold, and perform voltage regulation operation on the low voltage line according to the voltage difference.

[0097] Specifically, the low-voltage line is provided with a voltage regulating working circuit, and the voltage regulating working circuit is provided with a voltage regulating coil and two thyristors. The two thyristors are connected in series with the voltage regulating coil in an anti-parallel manner. By connecting the two thyristors in anti-parallel and then in series in the voltage regulating circuit, and by controlling the conduction and closing of the thyristors, convenient adjustment of the effective value of the output voltage of the voltage regulating working circuit can be achieved.

[0098] Specifically, the step of acquiring the input voltage of the line input terminal, calculating the voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference includes:

[0099] The difference between the input voltage and the preset voltage threshold is calculated to obtain the voltage difference between the input voltage and the preset voltage threshold, and it is detected whether the voltage difference is less than 0. If so, the voltage regulation working circuit of the low-voltage line is connected, and the voltage regulation operation is performed on the low-voltage line based on the voltage regulation working circuit. According to the voltage difference between the input voltage and the preset voltage threshold, a compensation voltage can be generated at the output end of the low-voltage line through the voltage regulation working circuit, so that the input voltage at the input end of the low-voltage line can be added to the compensation voltage, thereby ensuring that the output voltage at the output end of the low-voltage line meets the power voltage demand of the load equipment.

[0100] Specifically, whether the detection voltage difference is less than 0, if so, connecting the voltage regulation working circuit of the low voltage line, and performing a voltage regulation operation on the low voltage line based on the voltage regulation working circuit includes:

[0101] The voltage regulation control voltage is calculated based on the turns ratio of the voltage regulating coil of the voltage regulation working circuit in combination with the voltage difference; the voltage regulation control voltage is calculated based on the turns ratio of the input end coil and the output end line of the voltage regulating coil in the voltage regulation working circuit in combination with the voltage difference; the voltage difference is used as the output voltage of the voltage regulating coil of the voltage regulation working circuit, that is, the compensation voltage of the voltage regulation working circuit, so that the low voltage line can achieve a regulated output based on the compensation voltage.

[0102] A control angle is calculated based on the voltage regulation control voltage, a voltage regulation instruction of a voltage regulation working circuit is generated based on the control angle, a thyristor voltage regulation gear of the voltage regulation working circuit is selected according to the coil turns ratio of the voltage regulation coil of the voltage regulation working circuit, and a control angle of the thyristor of the voltage regulation working circuit is calculated according to the voltage regulation control voltage.

[0103] Furthermore, the control angle calculation formula of the thyristor is:

[0104] ;

[0105] in, is the control angle, To regulate the control voltage, is the input voltage, is the voltage-to-current ratio of the thyristor.

[0106] The control angle of the thyristor of the voltage regulating working circuit is calculated based on the voltage regulating control voltage. Based on the control angle and the turns ratio of the voltage regulating coil of the voltage regulating working circuit, the output voltage of the voltage regulating working circuit can be accurately adjusted to meet the voltage stabilization output requirement of the low-voltage coil.

[0107] Specifically, calculating the voltage regulation control voltage based on the turns ratio of the voltage regulation coil of the voltage regulation working circuit and in combination with the voltage difference includes:

[0108] The calculation formula of the voltage regulation control voltage is:

[0109] ;

[0110] ;

[0111] in, To regulate the control voltage, is the number of turns of the input end of the voltage regulating coil, n2 is the number of turns of the output end of the voltage regulating coil, is the voltage difference, is the input voltage at the input terminal, is the preset voltage threshold.

[0112] Specifically, the acquiring of the input voltage at the line input terminal, calculating the voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference further includes:

[0113] It is detected whether the voltage difference is less than 0. If not, the bypass working circuit of the low-voltage line is connected and the voltage regulating working circuit of the low-voltage line is disconnected to achieve normal operation of the low-voltage line.

[0114] The voltage detection module 20 is used to detect the load current of the output end of the low-voltage line after the voltage regulation operation, and calculate the actual output voltage of the output end of the low-voltage line based on the load current.

[0115] Specifically, after the voltage regulating working circuit performs voltage regulation on the output end voltage of the low-voltage circuit, the load current at the output end of the low-voltage circuit after the voltage regulation operation is obtained. Based on the load current, the actual output voltage of the low-voltage circuit after each voltage regulation operation by the voltage regulating working circuit can be calculated, so as to detect whether the low-voltage circuit meets the voltage stabilization output requirements.

[0116] Specifically, detecting a load current at the output end of the low-voltage circuit after the voltage regulation operation, and calculating the actual output voltage at the output end of the low-voltage circuit based on the load current includes:

[0117] Based on the ammeter obtaining the load current at the output end of the low-voltage circuit after the voltage regulation operation, when the voltage regulation working circuit completes a voltage regulation operation, the output end voltage of the low-voltage circuit, that is, the load current of the low-voltage circuit, is obtained through the ammeter to calculate the output voltage of the low-voltage circuit.

[0118] The voltage regulation working impedance of the low voltage line is obtained, and the actual output voltage of the load end is calculated based on the voltage regulation working impedance adjustment combined with the load current.

[0119] The calculation formula of the actual output voltage is:

[0120] ;

[0121] in, is the actual output voltage, is the load current, It is the working impedance of voltage regulation.

[0122] Specifically, when the low-voltage line operates for a long time, the working impedance of the voltage regulating working circuit in the low-voltage line changes, that is, the low-voltage line is prone to impedance changes caused by aging of wires and devices after working for a long time. The actual output voltage of the low-voltage line after the voltage regulation operation is detected and calculated.

[0123] The error calculation module 30 is used to extract the actual output voltage after each voltage regulation operation is completed within a detection cycle, sort out the sample data set, and calculate the voltage regulation error coefficient of the low voltage line according to the sample data set.

[0124] A detection cycle is set, the number of voltage regulation operations within the detection cycle is obtained, and the actual output voltage after each voltage regulation operation is obtained, the actual output voltage is set as sample data, and a sample data set is constructed.

[0125] In this embodiment, the detection period is set to 15 days to ensure that the low-voltage line can operate continuously. Since the impedance of the voltage regulation working circuit of the low-voltage line changes little, setting a long detection period can improve the detection reliability of the voltage stabilization output of the low-voltage line.

[0126] The rated output voltage of the low-voltage circuit is set as standard data, and the voltage regulation error coefficient of the sample data set is calculated according to the standard data to obtain the voltage regulation error coefficient of the low-voltage circuit.

[0127] The calculation formula of the voltage regulation error coefficient is:

[0128] ;

[0129] in, is the voltage regulation error coefficient, is the actual output voltage of the i-th sample data in the sample data set, is the rated output voltage of the low voltage line, is the average output voltage of the sample data set, is the number of sample data in the sample data set, is a constant, and .

[0130] Specifically, the mean data of the sample data in the sample data set is analyzed with the standard data, and the voltage regulation error coefficient between the low-voltage line output voltage data and the rated output voltage data within the detection period is obtained by analyzing the deviation between each sample data and the mean data, and the deviation between each sample data and the rated output voltage.

[0131] The threshold updating module 40 is used to adjust the preset voltage threshold according to the voltage regulation error coefficient to generate the preset voltage threshold of the next detection cycle.

[0132] The calculation formula for the preset voltage threshold of the next detection cycle is:

[0133] ;

[0134] in, is the preset voltage threshold for the next detection cycle, is the preset voltage threshold of the current detection cycle, is the voltage regulation error coefficient.

[0135] Specifically, an error coefficient analysis is performed based on the actual output voltage of the voltage regulating working circuit of the low-voltage line during the detection period in combination with the rated output voltage of the low-voltage line, and the preset voltage threshold of the next period is adjusted based on the voltage regulation error coefficient, so that the compensation voltage output by the voltage regulating working circuit is more accurate, ensuring that the output end of the low-voltage line can achieve a stable output voltage to meet the load usage requirements.

[0136] A person skilled in the art may understand that all or part of the steps in the various methods of the above embodiments may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the storage medium may include: a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk, etc.

[0137] In addition, the above is a detailed introduction to a control method and device for automatic voltage regulation of low-voltage lines provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A control method for automatic voltage regulation of a low voltage line, characterized in that: The automatic voltage regulation control method comprises: S11: acquiring an input voltage at a line input terminal, calculating a voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference; S12: Detecting a load current at the output end of the low-voltage circuit after the voltage regulation operation, and calculating an actual output voltage at the output end of the low-voltage circuit based on the load current; S13: extracting the actual output voltage after each voltage regulation operation is completed within a detection cycle, arranging to obtain a sample data set, and calculating the voltage regulation error coefficient of the low-voltage line according to the sample data set; S14: adjusting the preset voltage threshold according to the voltage regulation error coefficient to generate a preset voltage threshold for the next detection cycle; The actual output voltage after each voltage regulation operation is completed within a detection cycle is extracted, and a sample data set is obtained by sorting, and the voltage regulation error coefficient of the low-voltage line is calculated according to the sample data set, including: Setting a detection cycle, obtaining the number of voltage regulation operations within the detection cycle, and obtaining the actual output voltage after each voltage regulation operation, setting the actual output voltage as sample data, and constructing a sample data set; The rated output voltage of the low-voltage line is set as standard data, and the voltage regulation error coefficient of the sample data set is calculated according to the standard data to obtain the voltage regulation error coefficient of the low-voltage line; The calculation formula of the voltage regulation error coefficient is: Among them, γ is the voltage regulation error coefficient, U oi is the actual output voltage of the ith sample data in the sample data set, U e is the rated output voltage of the low voltage line, is the average output voltage of the sample data set, n is the number of sample data in the sample data set, i is a constant, and i≤n; The calculation formula for the preset voltage threshold of the next detection cycle is: IN' y =(1+γ)U y ; Among them, U′ y is the preset voltage threshold for the next detection cycle, U y is the preset voltage threshold of the current detection cycle, and γ is the voltage regulation error coefficient.

2. The control method for automatic voltage regulation of a low voltage line according to claim 1, characterized in that: The step of obtaining an input voltage at a line input terminal, calculating a voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference comprises: It is detected whether the voltage difference is less than 0. If so, the voltage regulating working circuit of the low-voltage line is connected, and the voltage regulating operation is performed on the low-voltage line based on the voltage regulating working circuit.

3. The control method for automatic voltage regulation of a low voltage line according to claim 2, characterized in that: Detecting whether the voltage difference is less than 0, and if so, connecting the voltage regulating working circuit of the low-voltage line, and performing a voltage regulating operation on the low-voltage line based on the voltage regulating working circuit includes: Calculating the voltage regulation control voltage based on the turns ratio of the voltage regulation coil of the voltage regulation working circuit and in combination with the voltage difference; A control angle is calculated based on the voltage regulation control voltage, and a voltage regulation instruction of the voltage regulation working circuit is generated based on the control angle.

4. The control method for automatic voltage regulation of a low voltage line according to claim 3, characterized in that: Calculating the voltage regulation control voltage based on the turns ratio of the voltage regulation coil of the voltage regulation working circuit and in combination with the voltage difference comprises: The calculation formula of the voltage regulation control voltage is: U c =Ui-U y ; IN k =(n1 / n2)*U c ; Among them, U k is the voltage control voltage, n1 is the number of turns of the input end of the voltage regulating coil, n2 is the number of turns of the output end of the voltage regulating coil, U c is the voltage difference, Ui is the input voltage at the input end, U y is the preset voltage threshold.

5. The control method for automatic voltage regulation of a low voltage line according to claim 2, characterized in that: The step of obtaining the input voltage at the line input terminal, calculating the voltage difference between the input voltage and a preset voltage threshold, and performing a voltage regulation operation on the low voltage line according to the voltage difference further includes: It is detected whether the voltage difference is less than 0. If not, the bypass working circuit of the low-voltage line is connected and the voltage regulating working circuit of the low-voltage line is disconnected to achieve normal operation of the low-voltage line.

6. The control method for automatic voltage regulation of a low voltage line according to claim 1, characterized in that: The detecting a load current at the output end of the low-voltage circuit after the voltage regulation operation, and calculating the actual output voltage at the output end of the low-voltage circuit based on the load current comprises: Obtaining the load current at the output end of the low voltage line after the voltage regulation operation based on the ammeter; The voltage regulation working impedance of the low voltage line is obtained, and the actual output voltage of the output end is calculated based on the voltage regulation working impedance adjustment combined with the load current.

7. A control device for automatic voltage regulation of a low voltage line, characterized in that: The control device comprises: The difference calculation module is used to obtain the input voltage of the line input terminal, calculate the voltage difference between the input voltage and the preset voltage threshold, and perform voltage regulation operation on the low voltage line according to the voltage difference; Voltage detection module: used to detect the load current of the output end of the low-voltage line after the voltage regulation operation, and calculate the actual output voltage of the output end of the low-voltage line based on the load current; Error calculation module: used to extract the actual output voltage after each voltage regulation operation is completed within a detection cycle, sort out the sample data set, and calculate the voltage regulation error coefficient of the low-voltage line according to the sample data set; Setting a detection cycle, obtaining the number of voltage regulation operations within the detection cycle, and obtaining the actual output voltage after each voltage regulation operation, setting the actual output voltage as sample data, and constructing a sample data set; The rated output voltage of the low-voltage line is set as standard data, and the voltage regulation error coefficient of the sample data set is calculated according to the standard data to obtain the voltage regulation error coefficient of the low-voltage line; The calculation formula of the voltage regulation error coefficient is: Among them, γ is the voltage regulation error coefficient, U oi is the actual output voltage of the ith sample data in the sample data set, U e is the rated output voltage of the low voltage line, is the average output voltage of the sample data set, n is the number of sample data in the sample data set, i is a constant, and i≤n; Threshold updating module: used for adjusting the preset voltage threshold according to the voltage regulation error coefficient to generate the preset voltage threshold of the next detection cycle; The calculation formula for the preset voltage threshold of the next detection cycle is: IN' y =(1+γ)U y ; Among them, U′ y is the preset voltage threshold for the next detection cycle, U y is the preset voltage threshold of the current detection cycle, and γ is the voltage regulation error coefficient.

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