Power supply tail end voltage compensation device and method

Abstract

The invention provides a power supply tail end voltage compensation device and method.The device comprises a voltage detection unit, a control unit, a compensation unit and a bypass unit, and the compensation unit comprises a parallel voltage device, an inductor, a parallel side converter, a direct-current capacitor, a series side converter and a series transformer; the parallel side converter, the direct current capacitor and the series side converter form a back-to-back voltage source type converter system, and active power can flow bidirectionally between the two converters; the controller controls the compensation unit to perform end voltage compensation based on the starting point voltage and the end voltage detected by the voltage detection unit. The whole power supply tail end voltage compensation device and method can effectively compensate tail end voltage fluctuation caused by long lines and large load changes, and underground power supply stability is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of voltage compensation, and in particular to effectively compensating for voltage loss in an underground coal mine environment to ensure the stability and safety of power supply. Background Art

[0002] With the rapid development of my country's economy, the equipment of fully mechanized mining faces is increasingly updated, and the number of super-large mines is increasing year by year. The high production and efficiency of the entire fully mechanized mining system depends on the advancement, reliability, reasonable selection and matching of the equipment on the one hand, and the power supply system of the fully mechanized mining face on the other hand. Whether the power supply system of coal mine underground is reasonable is closely related to the safety and reliability of the entire mine power grid. With the continuous improvement of the degree of mechanization of mining and excavation, the number of large mining height and long distance working faces has increased year by year, which has brought many new challenges and adverse effects to the safe power supply of coal mine underground. In addition, in order to improve work efficiency, reduce the reverse movement of equipment trains, and improve the working conditions of workers, large equipment does not enter the working face in principle, which puts higher requirements on the power supply of fully mechanized mining faces. Therefore, designing a power supply system suitable for modern mine fully mechanized mining equipment is the key to achieving safe and efficient mines.

[0003] The power supply system of the fully mechanized coal mining face must ensure stable voltage, complete protection, and correct and reasonable current setting to ensure safe production. During normal operation, the actual voltage loss of the power supply network must be less than the voltage loss allowed by the network. The working voltage of the motor and the voltage drop loss of the cable should meet the requirements to meet the normal use of motors and other equipment. Therefore, the long-distance power supply of the working face must solve the terminal voltage fluctuation caused by long lines and large load changes. Summary of the invention

[0004] The purpose of the present invention is to provide a power supply terminal voltage compensation device and method, which can effectively compensate for the terminal voltage fluctuations caused by the long line and large load changes of the power supply system of the coal mine fully mechanized mining working face, and ensure the stability of the underground power supply.

[0005] In a first aspect, a power supply terminal voltage compensation device is provided, the device comprising: a voltage detection unit, a compensation unit, a control unit and a bypass unit; wherein the voltage detection unit is used to detect the starting voltage and the terminal voltage of the power supply line; the compensation unit comprises a shunt voltage device Tp, an inductor Lp, a shunt side converter, a DC capacitor C, a series side converter, an inductor Ls and a series transformer Ts connected in series in sequence, the input of the shunt voltage device Tp is connected to the starting voltage, and the output of the series transformer Ts is connected to the terminal voltage; the controller drives the shunt voltage device Tp to generate a voltage at the starting point, and the output of the series transformer Ts is connected to the terminal voltage; the controller drives the shunt voltage device Tp to generate a voltage at the starting point, and the output of the series transformer Ts is connected to the terminal voltage; the controller drives the shunt voltage device Tp to generate a voltage at the starting point, and the output of the series transformer Ts is connected to the terminal voltage; the controller drives the shunt voltage device Tp to generate a voltage at the starting point, and the output of the series transformer Ts is connected to the terminal voltage; the controller drives the shunt voltage device Tp to generate a voltage at the end, and the shunt voltage device Tp to generate a voltage at the end ... The dynamic board is connected to the parallel side converter and the series side converter; the bypass unit includes switches QS1, QS2, and QS3. The bypass unit is connected in parallel with the compensation unit. One end of the switch QS1 is connected to the starting voltage, and the other end is connected to the switch QS3 or the parallel voltage device Tp, so that the switch QS1 is connected and switched between the switch QS3 and the parallel voltage device Tp; one end of the switch QS2 is connected to the terminal voltage, and the other end is connected to the switch QS3 or the parallel voltage device Tp, so that the switch QS2 is connected and switched between the switch QS3 and the parallel voltage device Tp.

[0006] In combination with any embodiment of the present application, the voltage detection unit is a voltage transformer, and voltage transformers are respectively arranged at the starting point and the end of the power supply line to collect the starting point voltage and the end voltage of the power supply line.

[0007] In combination with any embodiment of the present application, the parallel-side converter and the series-side converter are coupled together by DC capacitors to form a back-to-back voltage source converter system, and active power can flow bidirectionally between the two converters.

[0008] In combination with any embodiment of the present application, the parallel transformer Tp captures the input starting voltage from the power grid and inputs it to the parallel side converter through the inductor Lp. The parallel side converter stores the voltage in the DC capacitor. The series side converter obtains energy from the DC capacitor and connects the generated voltage in series to the compensated route through the inductor Ls and the series transformer Ts.

[0009] In combination with any embodiment of the present application, the parallel-side converter converts AC power into DC power, and the series-side converter inverts DC power into AC power.

[0010] In combination with any embodiment of the present application, the series transformer Ts adopts a star connection mode or a triangle connection mode.

[0011] In combination with any embodiment of the present application, each driving board includes a thyristor and a capacitor, and the control unit adjusts the compensation capacity of the compensation module by controlling the conduction angle of the thyristor, thereby achieving accurate compensation for the line end voltage.

[0012] In combination with any embodiment of the present application, when switch QS1 is switched to be connected to the parallel voltage device Tp and switch QS2 is switched to be connected to the parallel voltage device Tp, the compensation circuit is connected and the bypass circuit is disconnected; when switch QS1 is switched to be connected to switch QS3, switch QS3 is closed and switch QS2 is switched to be connected to switch QS3, the compensation circuit is disconnected and the bypass circuit is connected.

[0013] In a second aspect, a power supply terminal voltage compensation method is provided. Based on the terminal voltage compensation device, the method includes: Step 1: The voltage detection unit detects the starting voltage and the end voltage of the power supply line; Step 2: The control unit compares the detected terminal voltage value with the preset voltage stability range. If the detected voltage value is lower than the preset voltage stability range lower limit, or the detected voltage value is higher than the preset voltage stability range upper limit, then execute step 3, otherwise, execute step 4; Step 3: The control unit confirms the compensation voltage, and controls the compensation unit to perform voltage compensation according to the compensation voltage; Step 4: The control unit determines whether the compensation circuit fails. If no failure occurs, step 1 is executed. If a failure occurs, step 5 is executed. Step 5: The control unit controls the bypass circuit to be connected to the circuit to perform fault inspection and repair of the compensation circuit.

[0014] In combination with any embodiment of the present application, the control unit confirms the compensation voltage and controls the compensation unit to perform voltage compensation according to the compensation voltage, specifically including: the control unit calculates the reference terminal voltage according to the collected starting voltage and terminal voltage with the goal of minimizing the active power loss on the distribution line; the control unit determines the voltage compensation value according to the reference terminal voltage value and the collected terminal voltage value; the compensation unit compensates the terminal voltage according to the voltage compensation value.

[0015] In a third aspect, a computer-readable storage medium is provided, which stores a computer program / instruction, and when the computer instruction is executed by a processor, the method described in the second aspect is implemented.

[0016] In a fourth aspect, a computer program product is provided, the computer program product comprising a computer program or instructions; when the computer program or instructions are run on a computer, the computer is enabled to execute the method described in the second aspect above.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application.

[0018] The power supply terminal voltage compensation device of the present application generally consists of two major parts: a parallel side converter and a series side converter. The two are coupled together by a DC capacitor to form a back-to-back voltage source type converter system, and active power can flow bidirectionally between the two converters. The voltage generated on the series side is connected in series to the compensated line, which can simultaneously realize the unified adjustment of parameters such as the node voltage, impedance angle and line equivalent impedance of the power system. The voltage detection unit detects the starting voltage and the terminal voltage of the power supply line; the control unit compares the detected voltage value with the preset voltage stability range, and controls the compensation unit to increase or decrease the compensation capacity or maintain the current compensation capacity according to the comparison result. The entire device can effectively compensate for the terminal voltage fluctuations caused by long lines and large load changes, and ensure the stability of underground power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of a circuit structure of a power supply terminal voltage compensation device provided in an embodiment of the present application; Figure 2 A schematic diagram of the internal topology of a five-level UPFC device provided in an embodiment of the present application; Figure 3 A schematic diagram of a series transformer connection provided in an embodiment of the present application; Figure 4 A schematic diagram of a power supply terminal voltage compensation method provided in an embodiment of the present application; Figure 5 A schematic diagram of a mathematical model of a power supply terminal line provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present application, the technical solutions 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. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the embodiments of the present application should fall within the scope of protection of the embodiments of the present application.

[0022] Embodiment 1 A power supply terminal voltage compensation device, the specific circuit structure of which is as follows Figure 1As shown. The terminal voltage compensation device includes a voltage detection unit, a compensation unit, a control unit and a bypass unit. The voltage detection unit is used to detect the starting voltage and the terminal voltage of the power supply line; the compensation unit is used to generate a compensation voltage to compensate the terminal voltage; the control unit includes a controller, which calculates the compensation voltage according to the voltage value detected by the voltage detection unit, and controls the compensation unit to perform voltage compensation according to the compensation voltage; the bypass voltage is used to disconnect the compensation unit when a fault occurs in the compensation unit, and to repair the compensation unit.

[0023] The voltage detection unit is used to detect the starting voltage and the end voltage of the power supply line. As a specific implementation method, the voltage can be collected using a transformer. Specifically, a voltage transformer is set at the starting point of the power supply line to collect the starting voltage of the power supply line; at the same time, a voltage transformer is set at the end of the power supply line, and the voltage signal at the end of the power supply line is collected in real time using the voltage transformer, so as to obtain the end voltage of the power supply line.

[0024] The compensation unit includes a shunt voltage device Tp, an inductor Lp, a shunt side converter, a DC capacitor C, a series side converter, an inductor Ls and a Ts series transformer connected in series in sequence. The input of the shunt voltage device Tp is connected to the starting voltage, and the output of the Ts series transformer is connected to the terminal voltage.

[0025] The shunt transformer Tp captures the input starting voltage from the power grid and inputs it to the shunt side converter through the inductor Lp. The shunt side converter stores the voltage in the DC capacitor. The series side converter obtains energy from the DC capacitor and connects the generated voltage to the compensated route through the inductor Ls and the series transformer Ts. The shunt side converter, capacitor, and series side converter form a unified power flow controller (UPFC). The UPFC device is combined by sharing a DC capacitor between the shunt side converter and the series side converter. From the external characteristics, the two form a back-to-back voltage source converter system, and active power can flow bidirectionally between the two converters. UPFC converts AC power into DC power through the shunt side converter, and then inverts the DC power into AC power through the series side converter, realizing multiple functions such as shunt compensation, series compensation, phase shifting, and terminal voltage regulation, so as to achieve the purpose of real-time regulation of line active and reactive power, network power flow, and node voltage, and improve the stability of the power system. Figure 2 The internal topology diagram of a five-level UPFC device is given.

[0026] The series transformer Ts is used to compensate the compensation voltage to the input voltage to form a compensated output voltage. In one implementation, the input voltage and the output voltage are both three-phase voltages, and the series transformer Ts connects the generated three-phase voltage in series to the compensated route. Figure 3As shown, the series transformer Ts includes three windings on the primary side and three windings on the secondary side, the three windings on the primary side include ports 1-6, and the three windings on the secondary side include ports 7-12. The primary winding is connected to the input voltage and the output voltage, and the secondary winding is connected to the compensation voltage. In the specific connection mode, the series transformer Ts can be connected in star or triangle.

[0027] When the series transformer Ts adopts a star connection mode, the input voltage is connected to the 1, 3, and 5 ports of the series transformer Ts, and the compensated input voltage is connected to the 2, 4, and 6 ports of the series transformer Ts; the compensation voltage is connected to the 7, 9, and 11 terminals of the series transformer Ts, and the 8, 10, and 12 terminals of the series transformer Ts are connected together, and the connection mode of the 7-12 terminals of the series transformer Ts forms a star connection mode.

[0028] When the series transformer Ts is connected in a triangle, the input voltage is connected to the 1, 3, and 5 ports of the series transformer Ts, and the compensated input voltage is connected to the 2, 4, and 6 ports of the series transformer Ts. The compensation voltage is connected to the 7, 9, and 11 terminals of the series transformer Ts, the 8 and 9 terminals of the series transformer Ts are connected, the 10 and 11 terminals are connected, and the 12 terminal is connected to the 7 terminal, and the connection mode of the 7-12 terminals of the series transformer Ts forms a triangle connection mode.

[0029] The controller connects the parallel side converter and the series side converter through a driving board. Each driving board includes a thyristor and a capacitor. The control unit adjusts the compensation capacity of the compensation module by controlling the conduction angle of the thyristor, thereby realizing accurate compensation of the line end voltage.

[0030] The bypass unit includes switches QS1, QS2, and QS3 connected in sequence. The bypass unit is connected in parallel with the compensation unit. One end of the switch QS1 is connected to the starting voltage, and the other end is connected to the switch QS3 or the parallel voltage device Tp, so that the switch QS1 can be connected and switched between the switch QS3 and the parallel voltage device Tp; one end of the switch QS2 is connected to the terminal voltage, and the other end is connected to QS3 or the parallel voltage device Tp, so that the switch QS2 can be connected and switched between the switch QS3 and the parallel voltage device Tp. When the switch QS1 is switched to be connected to the parallel voltage device Tp, and the switch QS2 is switched to be connected to the parallel voltage device Tp, the compensation circuit is connected to the circuit, the bypass circuit is disconnected, and the entire circuit is in the voltage compensation function. When switch QS1 is switched to be connected to switch QS3, switch QS3 is closed, and switch QS2 is switched to be connected to switch QS3, the compensation circuit is disconnected, the bypass circuit is connected, and the entire circuit acts as a bypass, that is, the input voltage passes through switch QS1, switch QS3, and switch QS2 to the output voltage, thereby realizing fault inspection and repair of the compensation device.

[0031] Embodiment 2 The present application embodiment provides a power supply terminal voltage compensation method, based on the power supply terminal voltage compensation device described in the first embodiment. The specific implementation process of the terminal voltage compensation method is as follows: Figure 4 As shown, the specific steps include the following steps.

[0032] Step 1: The voltage detection unit detects the starting voltage and the end voltage of the power supply line.

[0033] There are many methods for detecting the starting voltage and the terminal voltage of the power supply line. As one of the specific implementation methods, this implementation method proposes to collect the voltage using a transformer. Specifically, a voltage transformer is set at the starting point of the power supply line to collect the starting voltage of the power supply line; at the same time, a voltage transformer is set at the end of the power supply line, and the voltage signal at the end of the power supply line is collected in real time using the voltage transformer, so as to obtain the terminal voltage of the power supply line.

[0034] During the voltage collection process, the collected data is output to the signal conditioning circuit, processed by the signal conditioning circuit, input into the sampling port of the digital signal processor, and converted into a digital signal through A / D conversion. Using the voltage transformer to collect voltage in real time can ensure the reliability and real-time nature of the collected data, laying the foundation for timely voltage regulation.

[0035] Step 2: The control unit compares the detected terminal voltage value with the preset voltage stability range. If the detected terminal voltage is lower than the preset voltage stability range lower limit, or the detected terminal voltage is higher than the preset voltage stability range upper limit, then execute step 3, otherwise, execute step 4.

[0036] When the terminal voltage is too low, it will reduce the efficiency of electrical equipment and affect the quality and efficiency of production at the coal mine fully-mechanized mining face; when the terminal voltage is too high, it will shorten the life of electrical equipment at the coal mine fully-mechanized mining face. Therefore, it is necessary to ensure that the terminal voltage is within the voltage range required by the coal mine fully-mechanized mining face. Specifically, the voltage range required by the coal mine fully-mechanized mining face consists of the lower limit of the voltage stability range and the upper limit of the voltage stability range. By comparing the detected terminal voltage value with the upper and lower limits of the preset voltage stability range, it is confirmed whether the terminal voltage meets the standards required by the coal mine fully-mechanized mining face.

[0037] Step 3: The control unit confirms the compensation voltage, and controls the compensation unit to perform voltage compensation according to the compensation voltage.

[0038] As one specific implementation method, this implementation method aims to minimize the active power loss on the distribution line and compensates the terminal voltage. Specifically, it includes the following steps.

[0039] Step 3.1: The control unit calculates the reference terminal voltage based on the collected starting voltage and terminal voltage with the goal of minimizing the active power loss on the distribution line.

[0040] Establish a mathematical model of the terminal distribution line and analyze the relationship between voltage, power flow and loss. The model should include all key nodes and line parameters. Figure 5 As shown, is the starting voltage of the distribution line (unit: V), is the complex power at the starting point of the distribution line (unit: VA), is the impedance of the distribution line (unit: ), I is the current of the distribution line (unit: A), is the voltage at the end of the distribution line (unit: V), is the complex power at the end of the distribution line (unit: VA).

[0041] According to the basic electrical relationship of the distribution line, the voltage drop of the line can be expressed as: (1) Among them, the current The complex power at the beginning of the distribution line can be and starting voltage Expressed as: (2) Substituting formula (2) into the electrical formula (1), the voltage drop of the line can be further expressed as (3) From formula (3), we can get the active and reactive components of the voltage drop as (4) (5) In the distribution line, the active loss and reactive loss of the distribution line can be expressed as (6) (7) The goal of terminal voltage optimization control is to optimize the terminal voltage distribution and reduce line loss by adjusting the output of the terminal voltage compensation device. The specific optimization problem is as follows. The reference terminal voltage is calculated by solving the optimization problem.

[0042] Step 3.2: The control unit determines a voltage compensation value according to a reference terminal voltage value and a collected terminal voltage value.

[0043] Step 3.3: The compensation unit compensates the terminal voltage according to the voltage compensation value.

[0044] Step 4: The control unit determines whether the compensation circuit is faulty. If not, execute step 1; if faulty, execute step 5.

[0045] Step 5: The control unit controls the bypass circuit to be connected to the circuit to perform fault inspection and repair of the compensation circuit.

[0046] When the compensation unit fails, it is necessary to access the circuit through the bypass unit and disconnect the compensation unit from the entire circuit. Specifically, one end of the switch QS1 can be switched between the switch QS3 or the parallel voltage device Tp, and one end of the switch QS2 can be switched between the switch QS3 or the parallel voltage device Tp. When the compensation unit fails, the control unit controls the switch QS1 to switch to connect with the switch QS3, the switch QS3 is closed, and the switch QS2 is switched to connect with the switch QS3. At this time, the input voltage passes through the switch QS1, the switch QS3, and the switch QS2 to the output voltage, and the compensation unit is disconnected from the entire circuit, so that the fault inspection of the compensation unit can be realized.

[0047] One embodiment of the present specification also provides a computer-readable storage medium, which stores a computer program / instruction, and when the computer instruction is executed by the processor, the steps of the above-mentioned power supply terminal voltage compensation method are implemented. The computer program / instruction includes a computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable storage medium can be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable storage medium does not include electric carrier signals and telecommunication signals.

[0048] An embodiment of the present specification also provides a computer program product, including a computer program / instruction, which, when executed in a processor, implements the steps of the above-mentioned power supply terminal voltage compensation method.

[0049] As for the computer-readable storage medium embodiment and the computer program product embodiment, since they are basically similar to the power supply terminal voltage compensation method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the power supply terminal voltage compensation method embodiment.

[0050] The above implementation methods are only used to illustrate the embodiments of the present application, and are not limitations on the embodiments of the present application. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the embodiments of the present application. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present application. The scope of patent protection of the embodiments of the present application should be limited by the claims.

Claims

1. A power supply terminal voltage compensation device, characterized in that: The device comprises: a voltage detection unit, a compensation unit, a control unit and a bypass unit; wherein, The voltage detection unit is used to detect the starting voltage and the end voltage of the power supply line; The compensation unit includes a shunt voltage device Tp, an inductor Lp, a shunt-side converter, a DC capacitor C, a series-side converter, an inductor Ls and a series transformer Ts which are sequentially connected in series, the input of the shunt voltage device Tp is connected to a starting voltage, and the output end of the series transformer Ts is connected to a terminal voltage; The controller is connected to the parallel side converter and the series side converter via a driving board; The bypass unit includes switches QS1, QS2, and QS3. The bypass unit is connected in parallel with the compensation unit. One end of the switch QS1 is connected to the starting voltage, and the other end is connected to the switch QS3 or the parallel voltage device Tp, so that the switch QS1 is connected and switched between the switch QS3 and the parallel voltage device Tp; one end of the switch QS2 is connected to the terminal voltage, and the other end is connected to the switch QS3 or the parallel voltage device Tp, so that the switch QS2 is connected and switched between the switch QS3 and the parallel voltage device Tp.

2. The power supply terminal voltage compensation device according to claim 1, characterized in that: The voltage detection unit is a voltage transformer, which is respectively arranged at the starting point and the end of the power supply line to collect the starting point voltage and the end voltage of the power supply line.

3. The power supply terminal voltage compensation device according to claim 1, characterized in that: The parallel-side converter and the series-side converter are coupled together by DC capacitors to form a back-to-back voltage source converter system, and active power can flow bidirectionally between the two converters.

4. The power supply terminal voltage compensation device according to claim 3, characterized in that: The parallel transformer Tp captures the input starting voltage from the power grid and inputs it to the parallel side converter through the inductor Lp. The parallel side converter stores the voltage in the DC capacitor. The series side converter obtains energy from the DC capacitor and connects the generated voltage in series to the compensated route through the inductor Ls and the series transformer Ts.

5. The power supply terminal voltage compensation device according to claim 4, characterized in that: The parallel side converter converts AC power into DC power, and the series side converter inverts DC power into AC power.

6. The power supply terminal voltage compensation device according to claim 1, characterized in that: The series transformer Ts is connected in star or triangle.

7. The power supply terminal voltage compensation device according to claim 1, characterized in that: Each driving board includes a thyristor and a capacitor. The control unit adjusts the compensation capacity of the compensation module by controlling the conduction angle of the thyristor, thereby achieving accurate compensation for the line end voltage.

8. The power supply terminal voltage compensation device according to claim 1, characterized in that: When switch QS1 is switched to be connected to the parallel voltage device Tp and switch QS2 is switched to be connected to the parallel voltage device Tp, the compensation circuit is connected and the bypass circuit is disconnected; when switch QS1 is switched to be connected to switch QS3, switch QS3 is closed and switch QS2 is switched to be connected to switch QS3, the compensation circuit is disconnected and the bypass circuit is connected.

9. A method for compensating voltage at a power supply terminal, based on the power supply terminal voltage compensation device according to any one of claims 1 to 8, the method comprising: Step 1: The voltage detection unit detects the starting voltage and the end voltage of the power supply line; Step 2: The control unit compares the detected terminal voltage value with the preset voltage stability range. If the detected voltage value is lower than the preset voltage stability range lower limit, or the detected voltage value is higher than the preset voltage stability range upper limit, then execute step 3, otherwise, execute step 4; Step 3: The control unit confirms the compensation voltage, and controls the compensation unit to perform voltage compensation according to the compensation voltage; Step 4: The control unit determines whether the compensation circuit fails. If no failure occurs, step 1 is executed. If a failure occurs, step 5 is executed. Step 5: The control unit controls the bypass circuit to be connected to the circuit to perform fault inspection and repair of the compensation circuit.

10. The power supply terminal voltage compensation method according to claim 9, characterized in that: The control unit confirms the compensation voltage and controls the compensation unit to perform voltage compensation according to the compensation voltage, specifically including: The control unit aims to minimize the active power loss on the distribution line and calculates the reference terminal voltage based on the collected starting voltage and terminal voltage; The control unit determines a voltage compensation value according to a reference terminal voltage value and a collected terminal voltage value; The compensation unit compensates the terminal voltage according to the voltage compensation value.

11. A computer-readable storage medium storing a computer program / instruction, wherein the computer program / instruction is executed by a processor to implement the method according to any one of claims 9 to 10.

12. A computer program product, characterized in that The computer program product comprises a computer program or instructions; when the computer program or instructions are run on a computer, the computer is enabled to execute the method according to any one of claims 9 to 10.

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