Method for uninterrupted meter replacement based on partial pressure and partial flow collaborative control

Abstract

This invention discloses a method for uninterrupted metering and meter replacement based on voltage divider and current shunting coordinated control, comprising: determining voltage deviation ΔU and current deviation ΔI based on real-time collected first grid data; if ΔU is greater than a preset voltage deviation threshold, changing the series-parallel connection mode of the capacitor array in the voltage divider unit based on ΔU and preset PID parameters, thereby updating the current voltage; if ΔI is greater than a preset current deviation threshold, changing the conduction angle α in the current shunting unit based on ΔI and preset PID parameters, thereby updating the current current; and according to the current voltage U... pre and current I pre Re-determine ΔU and ΔI. If ΔU is less than or equal to a preset voltage deviation threshold and ΔI is less than or equal to a preset current deviation threshold, then replace the meter. This technology achieves uninterrupted meter replacement through seamless voltage switching and stable current transfer.

Description

Technical Field

[0001] This invention relates to the field of electricity meter technology, and in particular to a method for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control. Background Technology

[0002] High-voltage meters are core equipment in electricity trade settlement, and their accuracy directly affects the economic interests of both electricity suppliers and consumers. According to electricity industry standards, high-voltage meters need to be replaced periodically (usually every 5-8 years), and faulty meters must be replaced immediately. Traditional replacement methods have the following technical drawbacks:

[0003] Power outage dependency: It requires interruption of power supply to high-voltage lines (average power outage duration 2-4 hours), which reduces the reliability of power supply for users. Industrial users may suffer production losses of tens of thousands of yuan per hour due to power outages.

[0004] Safety risks: Existing bypass short-circuit technology lacks a precise control mechanism, and the short-circuit current is prone to exceed the equipment's tolerance threshold, causing arc discharge or equipment burnout accidents.

[0005] Complex operation: Traditional uninterruptible power supply solutions require multiple sets of insulating tools and bypass switches, with more than 20 operation steps, which places extremely high demands on the skills of the operators.

[0006] Poor adaptability: It cannot be compatible with meter replacement scenarios of different voltage levels (6kV / 10kV / 35kV) and different wiring methods (three-phase three-wire / three-phase four-wire).

[0007] Therefore, developing uninterrupted replacement technology for high-voltage meters with precise control capabilities, high safety, and universal applicability has become a key requirement in the power operation and maintenance field. Summary of the Invention

[0008] The purpose of this invention is to provide a method for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control, which solves the problems of power outage dependence, high safety risks, complex operation and poor adaptability in the prior art, and achieves the technical goals of zero power outage, high safety and easy operation in the process of electricity meter replacement.

[0009] In a first aspect, embodiments of the present invention provide a method for uninterrupted metering and replacement of electricity meters based on voltage divider and current shunting coordinated control. The method is applied to a system for uninterrupted metering and replacement of electricity meters based on voltage divider and current shunting coordinated control. The system includes a voltage divider unit, a current shunting unit, a monitoring and feedback unit, and a control unit. The method includes: S102: determining the voltage deviation based on real-time collected first grid data. and current deviation The first power grid data is the current voltage. and current S104: If the voltage deviation If the voltage deviation exceeds a preset threshold, then based on the voltage deviation... The series and parallel connection of the capacitor array in the voltage divider unit is changed according to the preset PID parameters, thereby updating the current voltage. S106: If the current deviation If the current deviation exceeds a preset threshold, then based on the current deviation... The current is updated by changing the conduction angle α in the shunt unit according to the preset PID parameters. S108: Based on the current voltage and current Re-determine voltage deviation and current deviation If the voltage deviation The voltage deviation is less than or equal to a preset voltage deviation threshold and the current deviation is less than or equal to a preset voltage deviation threshold. If the current deviation is less than or equal to the preset threshold, the meter should be replaced.

[0010] Furthermore, S104 includes: S1042: Determining the partial voltage ratio correction based on the following formula. : ;in, and These are the voltage loop proportional coefficient and voltage integral coefficient in the preset PID parameters, respectively; S1044: Determine the capacitive reactance of the target capacitor array based on the following formula. : ;in, These are the meter parameters. S1046: Determine the number a of capacitors whose series-parallel connection method needs to be changed based on the following formula: (The current voltage division ratio is obtained in advance.) ;in, The capacitive reactance of the current capacitor array, S1048: Change the series-parallel connection of the a capacitors; S10410: Update the current voltage. .

[0011] Furthermore, S106 includes: S1062: Determining the target shunt current based on the following formula. : = - ;in, For the pre-obtained allowable current of the meter, The total line current is obtained in real time; S1064: The target conduction angle is determined based on the following formula. : ;in, , These are the current loop proportional coefficient, current integral coefficient, and current derivative coefficient in the preset PID parameters. The current conduction angle, S1066: Adjust the current conduction angle to the target conduction angle. S1068: Update current .

[0012] Furthermore, S1048 includes: the rate of change of the capacitive reactance of the capacitor array in a single change is less than or equal to a preset capacitive reactance switching threshold.

[0013] Further, S1066 includes: if the temperature of the uninterrupted metering and replacement system based on voltage and current splitting coordinated control is not within a preset temperature threshold range, then the adjustment rate of the conduction angle is reduced or increased based on a preset current splitting ratio coefficient. .

[0014] Further, in S102, the method further includes: if the current power grid is in an overvoltage state, or an overcurrent state, or a short circuit, or the voltage change rate within a preset first time interval is greater than a preset threshold, or the current change rate within a preset first time interval is greater than a preset threshold, then it is determined to be a level one fault, and all circuits are disconnected; if the voltage deviation The voltage deviation exceeds the preset threshold, and / or the current deviation exceeds the preset threshold. If the current deviation exceeds the preset threshold, it is determined to be a level 2 fault, and S104 and / or S106 are executed; if the communication is abnormal, it is determined to be a level 3 fault, and the uninterrupted metering and replacement system based on voltage and current division coordinated control maintains the operating state at the forward time.

[0015] Furthermore, the method also includes: collecting the first power grid data in real time based on a preset time interval, and determining the processing method based on the latest first power grid data.

[0016] Furthermore, the method also includes: the voltage divider unit is pre-configured with multiple capacitors, and the total number n of capacitors is determined as follows: ; ; = ; ;in, The line voltage before the system for uninterrupted metering and meter replacement based on voltage and current divider coordinated control is obtained in advance. Here, f represents the pre-acquired capacitance value of a single capacitor, and f represents the pre-acquired standard frequency of the meter. For the impedance parameters of the meter obtained in advance, The rated voltage of the meter is obtained in advance; This represents the total capacitance of all capacitors. This represents the total capacitive reactance of the voltage divider unit. This is the baseline value for the partial pressure ratio.

[0017] Secondly, embodiments of the present invention provide an apparatus for uninterrupted metering and replacement of electricity meters based on voltage divider and current shunting coordinated control. The apparatus is applied to a system for uninterrupted metering and replacement of electricity meters based on voltage divider and current shunting coordinated control. The system includes a voltage divider unit, a current shunting unit, a monitoring and feedback unit, and a control unit. The apparatus includes a first replacement module, used to determine the voltage deviation based on real-time collected first power grid data. and current deviation The first power grid data includes the current voltage. and current The second replacement module is used to address the voltage deviation. If the voltage deviation exceeds a preset threshold, then based on the voltage deviation... The series and parallel connection of the capacitor array in the voltage divider unit is changed according to the preset PID parameters, thereby updating the current voltage. The third replacement module is used to address the current deviation. If the current deviation exceeds a preset threshold, then based on the current deviation... The current is updated by changing the conduction angle α in the shunt unit according to the preset PID parameters. The fourth replacement module is used to adjust the voltage according to the current voltage. and current Re-determine voltage deviation and current deviation If the voltage deviation The voltage deviation is less than or equal to a preset voltage deviation threshold and the current deviation is less than or equal to a preset voltage deviation threshold. If the current deviation is less than or equal to the preset threshold, the meter should be replaced.

[0018] Thirdly, embodiments of the present invention provide a system for uninterrupted metering and replacement of electricity meters based on voltage divider and current shunting coordinated control. Further, the system includes: a voltage divider unit, a current shunting unit, a monitoring and feedback unit, and a control unit; the monitoring and feedback unit is used to collect first grid data; the control unit is used to issue commands to the voltage divider unit and / or the current shunting unit according to the first grid data; the voltage divider unit includes: a capacitor switching relay group, used to change the series and parallel connection mode of the capacitors in the capacitor array based on the commands of the control unit, thereby achieving voltage stability during the meter replacement process; the current shunting unit includes: a thyristor power subunit, used to change the conduction angle based on the commands of the control unit, thereby achieving stable current transfer during the meter replacement process.

[0019] The beneficial effects of the embodiments of the present invention are as follows:

[0020] This invention discloses a method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control, comprising: determining the voltage deviation based on real-time collected first grid data. and current deviation ;like If the voltage deviation exceeds the preset threshold, then based on The series and parallel connection of the capacitor array in the voltage divider unit is changed according to the preset PID parameters, thereby updating the current voltage; if If the current deviation exceeds the preset threshold, then based on The current is updated by changing the conduction angle α in the shunt unit according to the preset PID parameters; and by adjusting the current voltage. and current Re-determine and ,like Less than or equal to the preset voltage deviation threshold and If the current deviation is less than or equal to the preset threshold, the meter will be replaced. This technology enables uninterrupted meter replacement through seamless voltage switching and stable current transfer. Attached Figure Description

[0021] Figure 1 A flowchart of a method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control;

[0022] Figure 2 This is a first schematic diagram of a system for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control;

[0023] Figure 3 This is a second schematic diagram of a system for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control;

[0024] Figure 4 A flowchart of another method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control;

[0025] Figure 5 A simplified flowchart of a method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control;

[0026] Figure 6 This is a schematic diagram of a device for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1

[0029] This invention provides a method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control. The following is a description of the method. Figure 1 , Figure 2 , Figure 3 and Figure 4 This method will be explained.

[0030] like Figure 2 and Figure 3 As shown, this method is applied to a system for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control. The system includes a voltage splitting unit, a current splitting unit, a monitoring and feedback unit, and a control unit; each unit has different sub-units for performing different tasks.

[0031] The voltage divider unit is pre-configured with multiple capacitors to proportionally reduce the voltage of the high-voltage line to the meter's measurement range. Voltage regulation is achieved through capacitor series connection and other methods, and it also features overvoltage protection. It consists of a multi-stage capacitor array, a varistor array, a capacitor switching relay group, and a voltage signal conditioning circuit.

[0032] Before proceeding with the entire method, a static voltage divider network needs to be constructed, which requires setting up capacitors. The total number of capacitors, n, is determined as follows:

[0033] Formula 1;

[0034] Formula 2;

[0035] = Formula 3;

[0036] Formula 4;

[0037] in, The line voltage (i.e., the voltage before the meter replacement system based on voltage and current splitting coordinated control) is obtained in advance. Figure 3 (voltage value of node 5). Here, f represents the pre-acquired capacitance value of a single capacitor, and f represents the pre-acquired standard frequency of the meter. For the impedance parameters of the meter obtained in advance, The rated voltage of the meter is obtained in advance; This represents the total capacitance of all capacitors. This represents the total capacitive reactance of the voltage divider unit. This is the baseline value for the partial pressure ratio.

[0038] Configuring a multi-stage capacitor array in the voltage divider unit is one of the core objectives of the related operations, and determining the number of capacitors, n, is a crucial step in configuring this network. All initial capacitors are identical; "multi-stage" refers to the fact that the number of capacitors connected in series is determined by the calculation result (i.e., the value of n), allowing for flexible configuration of the series connection number based on actual operating conditions. Initially, the capacitors are connected in series to form a static voltage divider network. During subsequent dynamic adjustments, the control unit will switch the series combination of some capacitors via relay groups to adjust the total capacitive reactance. This allows for the adjustment of the current voltage value. .

[0039] After configuration, connect the uninterrupted metering and replacement system based on voltage and current splitting coordinated control to the high-voltage power grid and perform the following steps:

[0040] S102: Determine the voltage deviation based on the real-time collected first power grid data. and current deviation The first power grid data includes the current voltage. and current .

[0041] Specifically, the first power grid data refers to all the data collected by the monitoring feedback unit, which may include: the current voltage. (i.e., the output voltage of the voltage divider unit), current current (i.e., input current of the shunt unit), input voltage of the high-voltage line Input voltage of voltage divider unit (Ignoring losses, the two collected values ​​are consistent) High-voltage line input current 1. Meter input current wait.

[0042] Formula 5;

[0043] Formula 6;

[0044] in, The preset target voltage value, The preset target current value.

[0045] Specifically, this embodiment incorporates a three-level protection logic, which can evaluate multiple fault levels, each with a different handling method. Specifically, in S102, the three faults are described as follows:

[0046] Level 1 fault: If the current power grid is in an overvoltage state (usually...) Exceeding the meter's rated voltage 5% is considered an overvoltage, or it is in an overcurrent state (usually). Exceeding the meter's rated current This refers to overcurrent, short circuit, or voltage change rate within a preset first time interval. The current change rate is greater than a preset threshold, or within a preset first time interval. If the value exceeds the preset threshold, it is determined to be a level one fault, and all circuits are disconnected.

[0047] In summary, during a Level 1 fault (short circuit / overvoltage), the control subunit cuts off the output of the output subunit and triggers an audible and visual alarm within 0.5μs.

[0048] When an overvoltage occurs on a high-voltage line, the circuit is first disconnected. Then, the voltage divider is adjusted while the power is off. Specifically, this includes: when the voltage across the varistor of the voltage divider unit reaches the operating threshold, the varistor array immediately switches from a high-resistance state (≥10). 8 When the voltage drops from Ω to a low resistance state (≤10Ω), the overvoltage energy is released through the grounding loop. Simultaneously, the voltage signal conditioning circuit sends an "overvoltage trigger signal" to the A / D conversion module of the control unit, triggering rapid voltage adjustment. After receiving the signal, the control unit calculates the capacitive reactance adjustment based on the voltage deviation and adjusts the total capacitive reactance of the capacitor array by switching the series combination of capacitors through the relay group (single switching amplitude Z≤10% of total capacitive reactance). .

[0049] Level 2 fault: If the voltage deviation is... The voltage deviation exceeds the preset threshold, and / or the current deviation exceeds the preset threshold. If the current deviation exceeds the preset threshold, it is determined to be a level two fault, and S104 and / or S106 are executed.

[0050] In summary, during a Level 2 fault (over-temperature / excessive deviation), the computing module reduces the shunt ratio to 30% within 5ms.

[0051] Level 3 fault: If communication is abnormal, it is determined to be a Level 3 fault, and the uninterrupted metering and replacement system based on voltage and current splitting coordinated control will maintain the operating state at the previous time.

[0052] In summary, in the event of a Level 3 fault (communication anomaly), the system automatically switches to local control mode and operates according to the last valid parameters.

[0053] Specifically, when a Level 3 fault (communication anomaly) occurs, the control unit will automatically initiate a protection response: the system switches from the original control mode that may have relied on external communication to a local control mode. It no longer relies on external communication signals, but maintains operation based on the voltage and current division parameters (such as capacitor array combination status, thyristor conduction angle, etc.) from the last effective operation before the fault occurred. This ensures the continuity of power supply to high-voltage lines and related operations for meter replacement until communication is restored or manual intervention is required.

[0054] S104: If the voltage deviation If the voltage deviation exceeds a preset threshold, then based on the voltage deviation... The series and parallel connection of the capacitor array in the voltage divider unit is changed according to the preset PID parameters, thereby updating the current voltage. .

[0055] Specifically, S104 is also known as the dynamic voltage regulation step, corresponding to Figure 4 The S7 has a preset voltage deviation threshold of 2%, and the monitoring feedback unit collects the line voltage in real time. When the deviation ΔU > ±2%, the control unit sends a control signal to the relay group through the output subunit to switch the capacitor series-parallel combination mode and adjust the total capacitive reactance. During the adjustment process, pay attention to S1048: the rate of change of the capacitive reactance of the capacitor array in a single change is less than or equal to the preset capacitive reactance switching threshold, that is, the amplitude of a single capacitor switching is ≤10% of the total capacitive reactance, to avoid voltage oscillation.

[0056] S104 includes:

[0057] S1042: Determine the partial pressure ratio correction based on the following formula. :

[0058] Formula 7;

[0059] in, and These are the voltage loop proportional coefficient and voltage integral coefficient in the preset PID parameters; This is the integral of the voltage deviation over time, where t is time.

[0060] The specific data can be set as follows: It can also be adjusted according to the actual situation.

[0061] S1044: Determine the capacitive reactance of the target capacitor array based on the following formula. :

[0062] Formula 8;

[0063] in, These are the meter parameters. This is the current voltage ratio obtained in advance.

[0064] Specifically, It is calculated by using the voltage divider ratio formula based on the parameters of the previous sampling period. for .

[0065] S1046: Determine the number a of capacitors whose series-parallel connection method needs to be changed based on the following formula:

[0066] Formula 9;

[0067] in, The capacitive reactance of the current capacitor array, The capacitive reactance of a single capacitor obtained in advance.

[0068] S1048: Change the series and parallel connection method of the a capacitors.

[0069] Specifically, the rate of change of the capacitive reactance of the capacitor array in a single change should be less than or equal to the preset capacitive reactance switching threshold Z. That is, generally, the series-parallel connection mode of all a capacitors cannot be changed at once. The single capacitor switching amplitude (i.e., capacitive reactance switching threshold) should be ≤10% of the total capacitive reactance to avoid voltage oscillation and ensure voltage stability.

[0070] Let the number of capacitors changed in a single operation be... The calculation method is as follows:

[0071] Let the total capacitive reactance of the current capacitor array be... (i.e., the total capacitive reactance before switching), the total capacitive reactance of the capacitor array after a single switching is (i.e., the total capacitive reactance after switching), then the rate of change of capacitive reactance in a single operation must satisfy ≤10% (i.e., the capacitive reactance switching threshold Z) of the total capacitive reactance:

[0072] ;

[0073] The change in the total capacitive reactance of the capacitor array is determined by "changing the number of capacitors connected in series", and the capacitive reactance of a single capacitor is... (Fixed value) Therefore, when a′ capacitors are changed once, the corresponding change in capacitive reactance is: .

[0074] Based on the above threshold for the rate of change of capacitive reactance, we can deduce that: ;

[0075] The number of capacitors in a single switching operation can be derived. Restrictions:

[0076] ;

[0077] That is, by controlling the number of capacitors in a single switching operation. This indirectly ensures that the change in capacitive reactance does not exceed 10% of the total capacitive reactance (i.e., the capacitive reactance switching threshold Z).

[0078] S10410: Update current voltage .

[0079] More specifically, such as Figure 4For S72, if ΔK > 0, then increase the voltage division ratio K: control the relay to change part of the capacitor from parallel to series, and the total capacitive reactance... Increase, thus making Reduce (for example, changing three 1μF capacitors from parallel to series, increasing the total capacitive reactance from 0.33μF to 3μF).

[0080] like Figure 4 For S73, if ΔK < 0, then reduce the voltage divider ratio K: control the relay to change part of the capacitor from series to parallel connection, and the total capacitive reactance... Reduce, thus Increase (for example, three 3μF capacitors connected in parallel, increasing the total capacitive reactance from 3μF to 0.03μF).

[0081] Regulation effect verification: After the switching is completed, the voltage is collected at multiple status monitoring points of the monitoring feedback unit. (like Figure 4 (S74), if: If the current capacitor combination is maintained, then ΔK is recalculated and adjusted again; otherwise, ΔK is recalculated and adjusted again.

[0082] S106: If the current deviation If the current deviation exceeds a preset threshold, then based on the current deviation... The current is updated by changing the conduction angle α in the shunt unit according to the preset PID parameters. .

[0083] Specifically, S106 is also known as the dynamic current regulation step, corresponding to Figure 4 The S8 shunt unit is a module that can precisely regulate the current flowing through the meter, seamlessly transferring the current to a bypass during meter replacement to ensure safe replacement. It consists of a closed-loop Hall current sensor, a silicon controlled rectifier (SCR) power subunit, a non-inductive power resistor, and a temperature monitoring subunit. Magnetic isolation is used between the sensor and the power unit.

[0084] S106 includes:

[0085] S1062: Determine the target shunt current based on the following formula :

[0086] = - Formula 10;

[0087] in, For the pre-obtained allowable current of the meter, The total line current is obtained in real time;

[0088] S1064: Determine the target conduction angle based on the following formula :

[0089] Formula 11;

[0090] in, , These are the current loop proportional coefficient, current integral coefficient, and current derivative coefficient in the preset PID parameters. The current conduction angle, ;

[0091] S1066: Adjust the current conduction angle to the target conduction angle .

[0092] S1066 includes:

[0093] If the temperature of the uninterrupted metering and replacement system based on voltage and current splitting coordinated control is not within the preset temperature threshold range, then based on the preset current splitting ratio coefficient... Adjustment rate for decreasing or increasing the conduction angle .

[0094] S1068: Update current .

[0095] Specifically, the dynamic current regulation process includes the following steps:

[0096] Step 1: Current Measurement and Target Shunt Current Calculation:

[0097] The Hall sensor acquires the total line current at a sampling rate of 10kHz. The data is transmitted to the A / D conversion module of the control unit, and the calculation module calculates the target shunt current.

[0098] = - Formula 10;

[0099] in, The allowable current of the electricity meter can be taken as the rated current of the electricity meter. 10%, This refers to the total line current obtained in real time.

[0100] Step 2: Determine the target conduction angle based on the following formula :

[0101] Formula 11;

[0102] in, , These are the current loop proportional coefficient, current integral coefficient, and current derivative coefficient in the preset PID parameters. The current conduction angle, Based on Definitely. .

[0103] The following parameters can be selected: , , .

[0104] The calculation module of the control unit can also calculate based on the following formula. :

[0105] Formula 12;

[0106] η is the preset shunt efficiency, which can be set to 0.95-0.98, and the output phase trigger pulse.

[0107] Step 3: Gradually change the current conduction angle Until the target conduction angle During the start / stop phase, the conduction angle changes linearly at 3° / ms, which is the initial value of the conduction angle change rate. It is 0.003° / s, or expressed as 3° / ms.

[0108] Specifically, such as Figure 4 The S82 and S83 need to be based on ( The sign of the polarity determines the direction of change of the conduction angle. S82: If If the value is greater than 0, then increase the conduction angle. to improve ( ),make infinitely close to S83: If Less than 0, reduce the conduction angle. , thereby reducing ,make infinitely close to .

[0109] Step 4: The shunt current flows through the non-inductive resistor and is converted into heat energy. The temperature monitoring subunit monitors the resistor temperature in real time and determines the rate of change of the rate of change based on the temperature.

[0110] Case 1: When T is within the preset temperature threshold range (e.g.) When maintaining the current rate of change of conduction angle. That is, a uniform change of 0.003° / ms until it reaches... The magnitude of the change in the rate of change of the conduction angle under this condition =0.

[0111] Case 2: When T is greater than or equal to the highest temperature value within the temperature threshold range (e.g., T≥65℃), it is necessary to change (reduce) the rate of change of the conduction angle. Variation range The calculation method is as follows:

[0112] Formula 13;

[0113] = Formula 14;

[0114] = Formula 15;

[0115] in, The rate of change of the diversion ratio. The preset diversion ratio can be set to 5%. The initial diversion ratio is given, and t is the time interval between the moment when the highest temperature T above or equal to the temperature threshold range was first detected and the current moment. These are the total line current and the meter input current collected at the initial state monitoring point, respectively.

[0116] At this time, the rate of change of the conduction angle = - Formula 16.

[0117] Case 3: When T is less than or equal to the lowest temperature value of the first temperature threshold range (e.g., T < 55℃), the rate of change of the conduction angle can be changed (increased). , = + Variation range The calculation steps are described in Case 2 and will not be repeated here.

[0118] like Figure 4 As shown in S84 and S85, the temperature T is monitored in real time, and the rate of change of α is adaptively changed; Ispre changes, therefore Ipre changes.

[0119] More specifically, the current can also be adjusted using the following methods:

[0120] Current deviation calculation

[0121] ;

[0122] In the formula: To monitor the actual current (A) at the meter terminals collected by the feedback unit; For the target current (A)

[0123] Conduction Angle Adjustment Formula

[0124] ;

[0125] In the formula: The current conduction angle (°); The current loop proportionality factor is (0.5-1.2). The integral coefficient of the current loop is (0.02-0.1). The differential coefficients of the current loop are (0.01-0.05).

[0126] ;

[0127] When Δα is positive, the conduction angle increases; when it is negative, it decreases, limiting it to a safe range of 10°-170°.

[0128] The average value of the shunt current is linearly related to the conduction angle.

[0129] ;

[0130] Adjust the conduction angle based on formula 25 to make the actual shunt current approximate the target shunt current Is-target of formula 11.

[0131] In the formula: The shunt current is (A). The total line current (A) was collected by a Hall sensor. The conduction angle of the thyristor (°); The diversion efficiency coefficient is (0.95-0.98).

[0132] After adjustment, monitor the current flowing through the old meter. If so, maintain the current conduction angle; otherwise, recalculate Δα and adjust accordingly. Current measurement and target shunt current. Calculation of: Ipre ( (This refers to the rated current of the meter).

[0133] The total line current was collected at a sampling rate of 10 kHz. The data is transmitted to the A / D conversion module of the control unit, and the calculation module calculates the target shunt current. = - ;

[0134] in, The allowable current of the electricity meter can be taken as the rated current of the electricity meter. 10%.

[0135] Execution offloading and smooth transition

[0136] The calculation module of the control unit is based on Calculate the conduction angle of the thyristor (η is the shunt efficiency 0.95-0.98), output phase trigger pulse. During the start / stop phase, the conduction angle changes linearly at 3° / ms to ensure that the current change rate is ≤5A / ms.

[0137] Initial value of conduction angle: 13 ( The initial value of the conduction angle; The target shunt current; This represents the total current of the line. For diversion efficiency)

[0138] Conduction angle correction amount: 14 ( This is the correction amount for the conduction angle; This is the proportionality coefficient of the current loop; For current deviation; The integral coefficient of the current loop; This is the integral of the current deviation over time; These are the differential coefficients of the current loop; (Rate of change of current deviation) , , )

[0139] Start-up / stop phase, by ( To ensure the current change rate is linearly varied (for the conduction angle), 15 ( The rate of change of current; This refers to the change in current. (Change over time)

[0140] The shunt current flows through the non-inductive resistor and is converted into heat energy. The temperature monitoring subunit monitors the resistor temperature in real time. When the temperature is ≥65℃, the control unit reduces the shunt ratio by 5% / s. 16 ( The diversion ratio at time t; This is the initial diversion ratio; (for duration) As the initial ratio, (duration / s)

[0141] The shunt ratio (P(t)) is the ratio of the shunt current (Is) to the total line current (Itotal). ;

[0142] when At that time, maintain the current ratio;

[0143] when hour, 17 ( The diversion ratio at time t; This is the initial diversion ratio; (For duration).

[0144] During temperature regulation, the shunt ratio P(t) changes dynamically with temperature (e.g., it decreases when the temperature rises and recovers when the temperature falls), while the conduction angle α is directly related to the shunt ratio P(t). It can be derived from the rate of change of the diversion ratio.

[0145] The formula for calculating the conduction angle α is: Diversion ratio , deduced ;

[0146] That is, the conduction angle α is proportional to the shunt ratio P(t), and the proportionality coefficient is 180° / η.

[0147] The rate of change of the shunt ratio is ΔP / Δt (unit: 1 / ms). Combining this with the direct proportional relationship between α and P(t), the rate of change of the conduction angle is:

[0148] When the temperature is ≥65℃ (the shunt ratio decreases):

[0149] The formula for the diversion ratio is: (t unit: s), therefore the rate of change of the diversion ratio:

[0150] (The negative sign indicates a decrease)

[0151] Convert units (1s = 1000ms):

[0152] Substitution formula:

[0153] (The negative sign indicates that the conduction angle decreases over time)

[0154] When the temperature is ≤55℃ (shunt ratio recovers):

[0155] The formula for the split ratio in step 5 of the document is as follows: Therefore, the rate of change of the diversion ratio is:

[0156]

[0157] Substitution formula:

[0158] (The plus sign indicates that the conduction angle increases with time)

[0159] When 55°C < T < 65°C (shunt ratio remains unchanged):

[0160] Shunt ratio change rate , therefore: .

[0161] S108: Re-determine the voltage deviation and the current deviation based on the current voltage and the current. If the voltage deviation is less than or equal to the preset voltage deviation threshold and the current deviation is less than or equal to the preset current deviation threshold, replace the electricity meter.

[0162] Before replacing the electricity meter and for a period of time after replacement, the first grid data will be collected in real time based on a preset time interval, and the processing method will be determined based on the latest first grid data.

[0163] Figure 4 Specifically, that is Figure 4 S6 - S13. Monitoring and dynamic adjustment should be repeated in each link to maintain the stability of voltage and current, such as feedback verification of deviation (S6), secondary verification (S10), and adjustment after replacement (S13). S6 - S13 is a process of repeated data collection, repeated determination of the fault level, and voltage and current correction.

[0164] Once again, the innovation points of the embodiments of the present invention are as follows:

[0165] Structural design of the voltage - division and shunt - flow collaborative control device: The overall device architecture composed of a voltage - division unit (including components such as a multi - stage capacitor array and a varistor array), a shunt - flow unit (including components such as a closed - loop Hall current sensor and a thyristor power sub - unit), a control unit (including a calculation module, an A / D conversion sub - unit, etc.) and a monitoring and feedback unit (including multiple groups of monitoring pool unit measurement points and supporting sensors), as well as the specific composition and connection method of each module. Control sub - unit

[0166] Working method of the voltage - division unit: It includes the method of calculating the voltage - division ratio based on the line voltage and the rated voltage of the electricity meter to construct a static voltage - division network; the process of dynamically adjusting the voltage by monitoring the output voltage deviation and using a relay group to switch the series - parallel combination of capacitors (including the limit of the single - time capacitor switching amplitude); and the mechanism of the varistor array's response and rapid adjustment of the trigger voltage during over - voltage.

[0167] The working method of the shunt unit is as follows: the target shunt current is calculated based on the total line current collected by the Hall sensor; the control unit calculates the thyristor conduction angle according to the target shunt current, and controls the conduction angle to change linearly during the start / stop phase to achieve a smooth current transition; the temperature control logic monitors the temperature of the non-inductive resistor in real time through the temperature monitoring subunit and adjusts the shunt ratio accordingly.

[0168] The control strategy of the control unit includes: a data acquisition method that synchronously acquires multiple voltage and current signals using a high-speed A / D module; a control loop that executes every 100μs, generating voltage division ratio correction and conduction angle correction based on a fuzzy PID algorithm, and a collaborative control decision logic that prioritizes adjustment when voltage and current deviations exceed different ranges (including specific control objectives and input / output quantities for the main voltage loop and secondary current loop); and a three-level protection logic (response measures and time requirements corresponding to different fault types).

[0169] The beneficial effects of this embodiment are as follows:

[0170] 1. Zero power outage guarantee: With the precise voltage regulation of the voltage divider unit and the seamless current transfer of the current shunt unit, the high-voltage line is continuously powered during the replacement of the high-voltage meter, completely eliminating the dependence on power outages. Compared with the traditional method (average power outage of 2-4 hours), it can avoid production losses of tens of thousands of yuan per hour for industrial users and significantly improve the reliability of power supply.

[0171] 2. Enhanced safety: Through the closed-loop control of the control unit (100μs / control cycle) and three-level protection logic (response within 0.5μs for first-level faults), combined with the overvoltage protection of the voltage divider unit, the temperature control of the current shunt unit, and the real-time anomaly identification of the monitoring feedback unit, the risks of short-circuit current exceeding limits and arc discharge can be effectively avoided, reducing the rate of equipment burnout and safety accidents.

[0172] 3. Reduced operational complexity: The integrated voltage and current splitting collaborative control device reduces the reliance on multiple sets of insulating tools and bypass switches, simplifying the operation steps from more than 20 to less than 10, reducing the skill requirements for operators and improving replacement efficiency.

[0173] 4. This invention constructs a voltage-dividing and current-dividing coordinated control device, specifically including a voltage-dividing unit, a current-dividing unit, a control unit, and a monitoring and feedback unit. Combined with a closed-loop control strategy and a dynamic compensation algorithm, it enables the online replacement of high-voltage meters (low-voltage meters can also be replaced).

[0174] Example 2

[0175] See Figure 4 Taking the replacement of a 10kV three-phase three-wire high-voltage meter in an industrial park as an example, the specific implementation process is as follows:

[0176] S1 Initialization: First, determine the number of capacitors n based on the total capacitive reactance Xctotal, total capacitance Ctotal, and individual capacitor value Ci of the power grid. The capacitors are set in series in the voltage divider unit. Then, connect the entire collaborative device (i.e., the uninterrupted metering and replacement system based on voltage divider and current divider collaborative control) to the power grid.

[0177] Specifically, the uninterrupted metering and replacement system based on voltage divider and current divider coordinated control is connected to a 10kV high-voltage line. The control unit initiates a self-test: it checks the connection status of the voltage divider unit capacitor array, the current divider unit thyristor power subunit, and the monitoring feedback unit sensors (such as whether the capacitor switching relay group responds normally and whether the Hall sensor signal is stable); it initializes the internal bus communication to ensure that the data transmission link between the calculation module and the control subunit and the A / D conversion subunit is unobstructed.

[0178] Parameter settings: Initialize the control unit to set the rated voltage of the meter. Rated current Voltage loop proportionality coefficient =0.2, voltage integral coefficient =0.03, Current loop proportionality coefficient =0.8, current integral coefficient =0.05, differential coefficient =0.03 equal PID coefficient, the diversion efficiency η=0.96.

[0179] S2 operating condition judgment: Collect Upre, Ipre, and signal acquisition information to determine the fault level.

[0180] Specifically, after the system starts up, the monitoring and feedback unit initially collects the high-voltage input voltage (10kV), the total line current (initial 50A), and the initial status of the meter terminals, and the control unit performs operating condition determination.

[0181] Level 1 fault: If the voltage > 10.5kV (overvoltage) is detected on the first data acquisition. 5% of the current), current > 60A (overcurrent, greater than 5%) If there is a sensor communication failure, all circuits will be cut off, i.e., S3 (if the warning in the first-level protection logic is triggered, the replacement operation will not be performed temporarily).

[0182] Level 3 fault: S4: Abnormal signal acquisition indicates a Level 3 fault. In this case, maintain the current state and wait for communication to be restored or for manual intervention.

[0183] If there are no Level 1 or Level 3 faults, then execute S5: All monitored parameters (such as voltage and current) are within the set threshold range, and the parameter change rate within 100ms is ≤15%, the operating status of each module is stable, and no fault signal is triggered. (Normal operating conditions: voltage deviation ΔU ≤ ±2%, current deviation ΔI ≤ ±5% (at this time, the line voltage is stable at 10kV, the initial current at the meter terminal is 0, and the "no abnormality" condition is met), then proceed to S5.

[0184] In S5,

[0185] ;

[0186] ;

[0187] Upre is the voltage sensor at the voltage divider output, and Ipre is the current sensor at the shunt input.

[0188] like or Then it enters steady-state regulation, namely S7 and S8.

[0189] Since the initial operating conditions were normal, the device entered steady-state regulation mode and performed voltage and current splitting startup according to the conventional procedure.

[0190] like , If all values ​​are within the preset threshold range, then execute S6: Real-time data acquisition and recalculation. , .

[0191] Specifically, the A / D conversion subunit synchronously acquires the voltage at the voltage divider output terminal every 100μs. ( Target 10000V), total line current (50A) Meter terminal current (Initial 0A).

[0192] = - ;

[0193] The voltmeter current is used to calculate the target shunt current. =Itota_pre—Iv_pre; Data acquisition is all done by sensors and then sent to the AD conversion module.

[0194] Temperature of the non-inductive power resistor in the shunt unit (initial 25℃), and state of the capacitor array in the voltage divider unit (stable capacitive reactance of the series capacitor).

[0195] Calculate the deviation and rate of change

[0196] The calculation module processes the collected data:

[0197] Voltage deviation ΔU= , =100V (initially 0%, because no electricity meter was connected);

[0198] Current deviation ΔI= (Initially 0%)

[0199] The deviation change rates ΔU'=dΔU / dt and ΔI'=dΔI / dt (both are 0, indicating a stable state).

[0200] S8 is the "pre-access preparation stage," which requires re-collecting current line data (such as voltage divider output voltage and current shunt inlet current) and recalculating the deviation based on the target value (such as the preset safe access voltage). , .

[0201] S9: Replace the electricity meter.

[0202] Since ΔU and ΔI are both within the threshold (±2%, ±5%), according to the "light adjustment" rule: the voltage divider unit maintains the current capacitor series combination (capacitive reactance remains unchanged), and the current shunt unit does not start the thyristor for the time being (conduction angle 0°).

[0203] The adjustment force is positively correlated with the magnitude of the deviation (ΔU, ΔI). If the voltage deviation ΔU exceeds the preset range (e.g., ±5%), the adjustment force is calculated according to the deviation ratio (e.g., "single adjustment amplitude = deviation value × adjustment coefficient" in the formula). The larger the deviation, the greater the number of capacitors switched, the greater the adjustment amount of the thyristor conduction angle, etc., until the deviation enters the preset range.

[0204] Light adjustment means maintaining the current parameters without additional adjustment, and directly replacing the meter.

[0205] The adjustment judgments for S10 and S6 follow the same rules, so they will not be repeated here.

[0206] Output correction: The control unit outputs ΔK=0 (no correction for voltage division ratio) and Δα=0 (no correction for conduction angle), maintaining the current state.

[0207] During the feedback verification phase, the feedback verification deviation is checked, and the monitoring feedback unit collects the adjusted parameters.

[0208] Voltage =100V (0% deviation), current =0A (deviation 0%), all meet the "compliance" conditions (voltage ±2%, current ≤6A).

[0209] Here =100V actually refers to the "adaptive voltage output to the meter terminal after voltage division", not the original voltage of the high-voltage line, and is compared with the meter's rated voltage Um.

[0210] During the state maintenance phase, the current state is maintained, the control unit locks the current voltage and current parameters, and waits for the operator to perform the wiring preparations before the meter replacement (such as connecting the bypass line of the new meter).

[0211] Explanation of S7 voltage dynamic response and S8 current dynamic response:

[0212] ΔU= ;

[0213] ΔI=

[0214] calculate Formula 6 Thus, ΔK = -0.001 (the partial pressure ratio is corrected from the original 0.01 to 0.009).

[0215] ;

[0216] ;

[0217] The control capacitor switching relay group changes the two sets of series capacitors to parallel (reducing the total capacitive reactance by 10%), quickly adjusting the voltage divider output.

[0218] When the line voltage Uhigh = 10kV = 10000V and Um = 100V, if C1 = 1μF is selected, then:

[0219] ;

[0220] The initial capacitor array must meet the requirement of "1μF on the high-voltage side + 99μF on the low-voltage side in series" to achieve a voltage division from 10kV to 100V (voltage division ratio of 1%), thus achieving the goal of "voltage stabilization at 100V".

[0221] Specifically, all capacitors in the voltage divider unit are of the same type. Here, the total capacitance on the high-voltage side is adjusted to 1μF, and the total capacitance on the low-voltage side is adjusted to 99μF.

[0222] Repeated data collection and calculation

[0223] Data collected every 100μs =102V (ΔU=2%), ΔU'=-3% / ms (the deviation drops rapidly).

[0224] Secondary verification

[0225] If the voltage deviation drops to 2% (meets the standard), maintain the current capacitor configuration; if it still exceeds the tolerance (e.g. =103V, ΔU=3%), return to S8 to recalculate ΔK until the target is met.

[0226] Electricity meter replacement and restoration phase

[0227] Replacement operation execution

[0228] Under the "standard maintenance" condition (voltage 100±2V, meter terminal current ≤6A), the operator removes the old meter and installs the new meter (no power outage required).

[0229] Post-replacement adjustment: After the new meter is connected, the monitoring feedback unit collects the current Im' = 5A (≤6A) at the new meter terminal and the voltage... =100V:

[0230] Verification passed, proceed to maintenance.

[0231] The control unit gradually reduces the shunt current (the conduction angle decreases by 3° / ms), so that the current is smoothly transferred from the bypass (the temporary current path constructed by the shunt unit) to the new meter (current change rate ≤ 5A / ms).

[0232] Process complete: Shunt unit shuts down (conduction angle 0°), voltage divider unit restores initial capacitor combination, system exits operation, replacement complete.

[0233] Example 3

[0234] This invention provides a device for uninterrupted metering and replacement of electricity meters based on voltage and current sharing coordinated control. The device is applied to a system for uninterrupted metering and replacement of electricity meters based on voltage and current sharing coordinated control. The system includes a voltage dividing unit, a current sharing unit, a monitoring and feedback unit, and a control unit. Figure 6 As shown, the device includes:

[0235] The first replacement module is used to determine the voltage deviation based on the real-time collected first power grid data. and current deviation The first power grid data includes the current voltage. and current ;

[0236] The second replacement module is used to address the voltage deviation. If the voltage deviation exceeds a preset threshold, then based on the voltage deviation... The series and parallel connection of the capacitor array in the voltage divider unit is changed according to the preset PID parameters, thereby updating the current voltage. ;

[0237] The third replacement module is used to address the current deviation. If the current deviation exceeds a preset threshold, then based on the current deviation... The current is updated by changing the conduction angle α in the shunt unit according to the preset PID parameters. ;

[0238] The fourth replacement module is used to adjust the voltage according to the current voltage. and current Re-determine voltage deviation and current deviation If the voltage deviation The voltage deviation is less than or equal to a preset voltage deviation threshold and the current deviation is less than or equal to a preset voltage deviation threshold. If the current deviation is less than or equal to the preset threshold, the meter should be replaced.

[0239] The beneficial effects of the uninterrupted metering and replacement device based on voltage and current splitting coordinated control provided in this embodiment are the same as those of the method embodiment based on voltage and current splitting coordinated control for uninterrupted metering and replacement of electricity meters, and will not be repeated in this embodiment.

[0240] Example 4

[0241] like Figure 2 , Figure 3 As shown in the figure, this embodiment provides a schematic diagram of a system for uninterrupted metering and replacement of electricity meters based on voltage and current splitting collaborative control.

[0242] This system includes: a voltage divider unit, a current shunt unit, a monitoring and feedback unit, and a control unit; the monitoring and feedback unit is used to collect first grid data; the control unit is used to issue commands to the voltage divider unit and / or the current shunt unit according to the first grid data; the voltage divider unit includes: a capacitor switching relay group, used to change the series and parallel connection mode of the capacitors in the capacitor array according to the command of the control unit, thereby stabilizing the voltage during the meter replacement process; the current shunt unit includes: a thyristor power subunit, used to change the conduction angle according to the command of the control unit, thereby achieving stable current transfer during the meter replacement process.

[0243] The control unit is the core control component of this system, responsible for data processing, collaborative control decision-making, and safety protection execution. It consists of a computing module, control subunit, A / D conversion subunit, output subunit, communication interface, and power management module. The units are interconnected via an internal bus. The functions of the control unit are as follows:

[0244] Function 1: Data Acquisition

[0245] The high-speed A / D module synchronously acquires 6 voltage and 4 current signals based on status monitoring points and transmits them to the memory of the computing module via an internal bus.

[0246] The voltage specifications for the 6 channels are as follows:

[0247] UI: High-voltage line input voltage (2 channels) Nodes 5 and 6 of the high-voltage line are connected to the device to monitor the high-voltage incoming voltage and provide a reference for the adjustment of the voltage divider unit.

[0248] UI: Input voltage of voltage divider unit (2 channels) Nodes 14 and 13 of the voltage divider unit (input terminals of the voltage divider unit) monitor the voltage before it enters the voltage divider unit and control the voltage division accuracy.

[0249] U_pre: Output voltage of the voltage divider unit (2 channels, voltage at the meter connection side)

[0250] The corresponding nodes in the diagram are nodes 3 and 4 (meter terminals), which are directly connected to the high-voltage energy meter to ensure stable voltage output to the meter and meet the voltage accuracy requirements for "uninterrupted metering".

[0251] The current for the four channels is described below:

[0252] I_total: Input current of high-voltage lines (2 channels)

[0253] At nodes 5 and 6 where the high-voltage line connects to the device, the total incoming current is monitored to provide a basis for shunt control.

[0254] I_pre: Input current of the shunt unit (2 channels)

[0255] Corresponding to nodes in the diagram: nodes 11 and 12 of the current shunting unit (input of the current shunting unit), monitor the current "bypassing the meter" after current shunting to ensure that the current path is intact when the meter is replaced, and achieve "uninterrupted power supply".

[0256] I_v_pre: Meter input current, corresponding to node 2 in the diagram.

[0257] Function 2: Collaborative Control Decision

[0258] The calculation subunit executes a control loop every 100μs: calculates the voltage deviation ΔU, current deviation ΔI and their rate of change, and generates the voltage division ratio correction ΔK and conduction angle correction Δα through a fuzzy PID algorithm.

[0259] When ΔU > ±3%, the voltage divider unit is adjusted first; when ΔI > ±5%, the current shunt unit is adjusted. The dual-ring coordination ensures parameter stability.

[0260] Specific control steps:

[0261] a. Voltage main loop control (voltage divider unit adjustment)

[0262] Control objective: Maintain the voltage at the meter's voltage measuring terminal within ±2% of the rated value. Input: Voltage deviation ΔU, deviation change rate ΔU' (dΔU / dt). Output: Voltage divider ratio correction ΔK (used to adjust the capacitor array of the voltage divider unit).

[0263] b. Current secondary loop control (shunt unit adjustment)

[0264] Control objective: Control the current flowing through the old meter to be ≤10% of the rated current. Input: Current deviation ΔI, deviation change rate ΔI' (dΔI / dt); Output: Thyristor conduction angle correction Δα (used to adjust the shunt current).

[0265] The monitoring feedback unit monitors the electrical parameters of each node in real time and feeds the data back to the control unit system, providing a basis for control decisions. The monitoring system includes six monitoring points (high-voltage input, voltage divider output, meter connection, and shunt inlet / outlet), each equipped with a voltage sensor and a current sensor, along with signal conditioning circuitry and a data storage subunit. The sensor cables feature a double-shielded design. The monitoring feedback unit functions as follows:

[0266] Function 1: Multi-dimensional status monitoring

[0267] The sensors collect electrical parameters of each node in real time, which are then converted into a 0-3.3V standard signal by the conditioning circuit before being transmitted to the control unit. The sampling frequency is 10kHz and the data update cycle is 100μs to ensure real-time status monitoring.

[0268] Function 2: Anomaly Detection and Recording

[0269] A dual criterion of "threshold + trend" is adopted: when a parameter exceeds the threshold range or the rate of change within 100ms is greater than 15%, it is judged as abnormal. Waveform data for 100ms before and after the abnormality is automatically recorded, and an abnormality report including timestamps is generated.

[0270] Function 3: Data Upload

[0271] Under normal circumstances, the collected data is packaged and uploaded every 5 seconds; under abnormal circumstances, it is uploaded in real time.

[0272] The beneficial effects of the uninterrupted metering and replacement system based on voltage and current splitting coordinated control provided in this embodiment are the same as those of the method embodiment based on voltage and current splitting coordinated control for uninterrupted metering and replacement, and will not be repeated in this embodiment.

[0273] The above embodiments are merely illustrative examples and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control, characterized in that, The method is applied to a system for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control. The system includes a voltage splitting unit, a current splitting unit, a monitoring and feedback unit, and a control unit. The method includes: S102: Determine the voltage deviation based on the real-time collected first power grid data. and current deviation The first power grid data includes the current voltage. and current ; S104: If the voltage deviation If the voltage deviation exceeds a preset threshold, then based on the voltage deviation... The series and parallel connection of the capacitor array in the voltage divider unit is changed according to the preset PID parameters, thereby updating the current voltage. ; S106: If the current deviation If the current deviation exceeds a preset threshold, then based on the current deviation... The current is updated by changing the conduction angle α in the shunt unit according to the preset PID parameters. ; S108: Based on the current voltage and current Re-determine voltage deviation and current deviation If the voltage deviation The voltage deviation is less than or equal to a preset voltage deviation threshold and the current deviation is less than or equal to a preset voltage deviation threshold. If the current deviation is less than or equal to the preset threshold, the meter should be replaced.

2. The method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control according to claim 1, characterized in that, S104 includes: S1042: Determine the partial pressure ratio correction based on the following formula. : ； in, and These are the voltage loop proportional coefficient and voltage integral coefficient in the preset PID parameters; S1044: Determine the capacitive reactance of the target capacitor array based on the following formula. : ； in, These are the meter parameters. The current voltage ratio is obtained in advance; S1046: Determine the number a of capacitors whose series-parallel connection method needs to be changed based on the following formula: ； in, The capacitive reactance of the current capacitor array, The capacitive reactance of a single capacitor obtained in advance; S1048: Change the series and parallel connection method of the a capacitors; S10410: Update current voltage .

3. The method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control according to claim 2, characterized in that, S106 includes: S1062: Determine the target shunt current based on the following formula : = - ； in, For the pre-obtained allowable current of the meter, The total line current is obtained in real time; S1064: Determine the target conduction angle based on the following formula : ； in, , These are the current loop proportional coefficient, current integral coefficient, and current derivative coefficient in the preset PID parameters. The current conduction angle, ; S1066: Adjust the current conduction angle to the target conduction angle ; S1068: Update current .

4. The method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control according to claim 3, characterized in that, S1048 includes: The rate of change of the capacitive reactance of the capacitor array in a single change is less than or equal to the preset capacitive reactance switching threshold.

5. The method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control according to claim 4, characterized in that, S1066 includes: If the temperature of the uninterrupted metering and replacement system based on voltage and current splitting coordinated control is not within the preset temperature threshold range, the adjustment rate of the conduction angle will be reduced or increased based on the preset current splitting ratio coefficient. .

6. The method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control according to claim 1, characterized in that, In S102, the method further includes: If the current power grid is in an overvoltage state, or an overcurrent state, or a short circuit, or if the rate of change of voltage within a preset first time interval is greater than a preset threshold, or if the rate of change of current within a preset first time interval is greater than a preset threshold, then it is determined to be a level one fault and all circuits are disconnected. If the voltage deviation The voltage deviation exceeds the preset threshold, and / or the current deviation exceeds the preset threshold. If the current deviation exceeds the preset threshold, it is determined to be a level two fault, and S104 and / or S106 are executed. If communication is abnormal, it is determined to be a level three fault, and the uninterrupted metering and replacement system based on voltage and current splitting collaborative control will maintain the operating state at the previous time.

7. The method for uninterrupted metering and meter replacement based on voltage and current splitting coordinated control according to claim 6, characterized in that, The method further includes: The first power grid data is collected in real time based on a preset time interval, and the processing method is determined based on the latest first power grid data.

8. The method for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control according to claim 1, characterized in that, The method further includes: multiple capacitors are pre-set in the voltage divider unit, and the total number n of capacitors is determined as follows: ； ； = ； ； in, The line voltage before the system for uninterrupted metering and meter replacement based on voltage and current divider coordinated control is obtained in advance. Here, f represents the pre-acquired capacitance value of a single capacitor, and f represents the pre-acquired standard frequency of the meter. For the impedance parameters of the meter obtained in advance, The rated voltage of the meter is obtained in advance; This represents the total capacitance of all capacitors. This represents the total capacitive reactance of the voltage divider unit. This is the baseline value for the partial pressure ratio.

9. A device for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control, characterized in that, The device is applied to a system for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control. The system includes a voltage splitting unit, a current splitting unit, a monitoring and feedback unit, and a control unit. The device includes: The first replacement module is used to determine the voltage deviation based on the real-time collected first power grid data. and current deviation The first power grid data includes the current voltage. and current ; The second replacement module is used to address the voltage deviation. If the voltage deviation exceeds a preset threshold, then based on the voltage deviation... The series and parallel connection of the capacitor array in the voltage divider unit is changed according to the preset PID parameters, thereby updating the current voltage. ; The third replacement module is used to address the current deviation. If the current deviation exceeds a preset threshold, then based on the current deviation... The current is updated by changing the conduction angle α in the shunt unit according to the preset PID parameters. ; The fourth replacement module is used to adjust the voltage according to the current voltage. and current Re-determine voltage deviation and current deviation If the voltage deviation The voltage deviation is less than or equal to a preset voltage deviation threshold and the current deviation is less than or equal to a preset voltage deviation threshold. If the current deviation is less than or equal to the preset threshold, the meter should be replaced.

10. A system for uninterrupted metering and replacement of electricity meters based on voltage and current splitting coordinated control, characterized in that, The system includes: a voltage divider unit, a current divider unit, a monitoring and feedback unit, and a control unit; The monitoring feedback unit is used to collect data from the first power grid. The control unit is used to issue instructions to the voltage divider unit and / or current divider unit based on the first power grid data; The voltage divider unit includes a capacitor switching relay group, used to change the series and parallel connection mode of the capacitors in the capacitor array based on the instructions of the control unit, thereby stabilizing the voltage during the replacement of the electricity meter. The current shunt unit includes a silicon controlled rectifier (SCR) power subunit, which is used to change the conduction angle based on the instructions of the control unit, thereby achieving stable current transfer during the replacement of the electricity meter.

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