Automatic power compensation calibration tool and calibration method

Abstract

The present invention discloses an automatic power compensation calibration tool and calibration method in the field of power compensation calibration, which can solve the technical problems that the manual adjustment of capacitor compensation parameters has a long viewing angle, cumbersome operation, and affects production efficiency. It includes a track signal acquisition unit, a local signal acquisition unit, and a digital signal processing unit coupled with the output ends of the track signal acquisition unit and the local signal acquisition unit, and calculates compensation parameters according to the acquisition values ​​of the track signal acquisition unit and the local signal acquisition unit; it also includes a power compensation unit including a connected execution unit and a compensation unit, the execution unit is connected to the digital signal processing unit, and the compensation unit is respectively connected to the track signal input unit and the track output unit. The present invention uses a closed-loop method to put the power of reactive compensation, so as to complete the calibration of multiple modules under very small input current conditions, thereby improving the waveform quality during calibration, saving time cost, and improving the product cost performance.

Description

Technical Field

[0001] The invention relates to the field of power compensation calibration, and in particular to an automatic power compensation calibration tool and a calibration method. Background Art

[0002] Due to its hardware characteristics, the 25Hz phase-sensitive track circuit electronic receiver will produce voltage and phase difference offsets during operation due to the influence of temperature and channel inertia. Therefore, during the production and debugging process, it is necessary to pre-calibrate the voltage and phase delay parameters at different temperature levels.

[0003] Because the interface characteristics of the 25Hz phase-sensitive track circuit electronic receiver and the track circuit are highly inductive, when multiple electronic receivers are calibrated together, the inductive load will increase with the increase of the calibrated electronic receivers, resulting in a large distortion of the 25Hz signal source sine wave output signal, making the input and output functions of the calibrated 25Hz phase-sensitive track circuit electronic receiver different from the sine wave signal sampled by the actual 25Hz track circuit, thus adding additional detection errors to the sampling of the 25Hz track signal. At the same time, as the inductive load of the calibrated load increases and the power factor decreases, the reactive power output of the 25Hz signal source increases, reducing the number of calibrated 25Hz phase-sensitive track circuit electronic receivers driven by the signal source. As the number of calibrated load electronic receivers changes, the parameters of the capacitors involved in the compensation also change synchronously, and the compensation capacitor parameters need to be adjusted at any time according to the changes in the number of calibrated modules.

[0004] Considering that the 25Hz phase-sensitive track circuit electronic receiver involved in the calibration needs to be calibrated under different voltage and temperature levels, the manual adjustment of the capacitance compensation parameters takes a long time, which leads to a prolonged calibration process and cumbersome operation, greatly affecting production efficiency. It is necessary to perform automatic feedback compensation on the 25Hz signal source output to correct the sinusoidal wave distortion and eliminate the additional detection error caused by the distortion of the 25Hz output signal waveform. Summary of the invention

[0005] The purpose of the present invention is to provide an automatic power compensation calibration tool and calibration method, which can solve the technical problem that the manual adjustment of capacitor compensation parameters has a long viewing angle, resulting in a prolonged calibration process, cumbersome operations, and affecting production efficiency.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An automatic power compensation calibration tool comprises a track signal acquisition unit, whose input end is connected to the track signal; a local signal acquisition unit, whose input end is connected to the local signal; a digital signal processing unit, coupled to the output ends of the track signal acquisition unit and the local signal acquisition unit, and calculating compensation parameters according to the acquisition values ​​of the track signal acquisition unit and the local signal acquisition unit; and a power compensation unit, wherein the power compensation unit comprises an execution unit and a compensation unit connected to each other, the execution unit is connected to the digital signal processing unit, and the compensation unit is respectively connected to the track signal input unit and the track output unit.

[0008] As an improved solution of the present invention, in order to further facilitate the collection of voltage, current and frequency parameters of the track signal, the track signal collection unit includes a track signal input unit connected to the track signal, and also includes a track signal voltage conditioning unit, a track signal current conditioning unit and a track signal frequency detection unit respectively connected to the track signal input unit and the digital signal processing unit.

[0009] As an improved solution of the present invention, in order to further facilitate the connection and collection of track signals, the track signal input unit includes a Hall sensor, a transformer T1 and a sampling resistor R2. The Hall sensor is connected to the track signal neutral line, and the two ends of the primary winding of the transformer T1 are respectively connected to the Hall sensor and the live wire of the track signal, and its secondary winding is connected to the track signal voltage conditioning unit after being connected in parallel with the sampling resistor R2; the track signal frequency detection unit and the track output unit are also connected in parallel between the live wire of the track signal and the Hall sensor.

[0010] As an improved solution of the present invention, in order to further collect track signal current parameters, the track signal current conditioning unit includes an operational amplifier U1, the first input terminal of the operational amplifier U1 is connected to resistor R3, the second input terminal is connected to resistor R4 and then grounded, the output terminal is connected to resistor R6, the resistor R3 is connected to the Hall sensor, the resistor R6 is respectively connected to the digital signal processing unit and the capacitor C1, and a resistor R5 is connected between the first input terminal and the output terminal of the operational amplifier U1.

[0011] As an improved solution of the present invention, in order to further collect track signal voltage parameters, the track signal voltage conditioning unit includes an operational amplifier U2, the first input terminal of the operational amplifier U2 is connected to resistor R7, the second input terminal is connected to resistor R8 and then grounded, the output terminal is connected to resistor R10, the resistor R7 is connected to the secondary winding of the transformer T1, the resistor R10 is respectively connected to the digital signal processing unit and the capacitor C2, and a resistor R9 is connected between the first input terminal and the output terminal of the operational amplifier U2.

[0012] As an improved solution of the present invention, in order to further collect the track signal frequency parameters, the track signal frequency detection unit includes an isolation optocoupler U3, one end of the light emitter of the isolation optocoupler U3 is connected in series with the resistor R11 and then connected to the track signal input unit, and a diode D2 is also connected between the two ends of the light emitter of the isolation optocoupler U3, one end of the light receiver is grounded and the other end is respectively connected to the pull-up resistor R12 and the input end of the inverter U4, the pull-up resistor R12 is connected to the power supply, and the output end of the inverter U4 is connected to the digital signal processing unit.

[0013] As an improved solution of the present invention, in order to further collect local signal frequency parameters, the local signal collection unit includes a local input unit and a local signal frequency detection unit, and the local signal frequency detection unit includes an isolation optocoupler U5, one end of the isolation optocoupler U5 light emitter is connected in series with a resistor R13 and then connected to the local input unit, and a diode D3 is also connected between the two ends of the isolation optocoupler U5 light emitter, one end of its light receiver is grounded and the other end is respectively connected to a resistor R14 and an input end of an inverter U6, the resistor R14 is connected to a power supply, and the output end of the inverter U6 is connected to the digital signal processing unit.

[0014] As an improved solution of the present invention, in order to further facilitate the adjustment of the number of adjustment units put into compensation by the execution unit, the execution unit includes at least two groups of adjustment units, and the adjustment unit includes an optocoupler, one end of the optocoupler photosensor is connected to the digital signal processing unit, and the other end is connected in series with a current limiting resistor and then connected to a power supply; one end of the optocoupler photosensor is grounded, and the other end is connected to a relay coil and then connected to a power supply.

[0015] As an improved solution of the present invention, in order to further facilitate fine-tuning of the compensated track signal, the compensation unit includes capacitors corresponding to the number of the adjustment units, and the capacitors are connected to the normally open contacts of the relay and at both ends of the equivalent inductor, and the two ends of the equivalent inductor are also connected to the track signal input unit.

[0016] A calibration method for an automatic power compensation calibration tool comprises the following steps:

[0017] S1: The track signal acquisition unit detects the actual power consumption parameter data of the calibrated load;

[0018] S2: The digital signal processing unit compares the actual power consumption parameter data of the calibration load and the compensation data of a single calibration module to obtain the actual number of calibration modules and the preset compensation parameters;

[0019] S3: The digital signal processing unit outputs a signal, and the execution unit invests compensation capacity according to preset compensation parameters;

[0020] S4: The track signal acquisition unit collects the power consumption parameter data of the compensated calibration load in real time, and the digital signal processing unit compares the power consumption parameter data collected by the local signal acquisition unit and obtains a deviation value;

[0021] S5: The digital signal processing unit outputs a signal, and the compensation unit invests compensation capacity according to the deviation value;

[0022] S7: Repeat S4-S5 until the deviation value obtained by the digital signal processing unit is within a preset range.

[0023] Beneficial effects: The present invention uses a closed-loop method to deliver reactive power compensation power, thereby completing the calibration of multiple modules under very small input current conditions, improving the waveform quality during calibration, saving time costs, and improving the product cost performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is an overall block diagram of the present invention;

[0025] Figure 2 is an internal block diagram of the power conversion unit of the present invention;

[0026] Figure 3 is an internal block diagram of a track signal input unit of the present invention;

[0027] Figure 4 It is an internal block diagram of the track signal current conditioning unit of the present invention;

[0028] Figure 5 is an internal block diagram of the track signal voltage conditioning unit of the present invention;

[0029] Figure 6 is an internal block diagram of a track signal frequency detection unit of the present invention;

[0030] Figure 7 is an internal block diagram of a local signal frequency detection unit of the present invention;

[0031] Figure 8 is an internal block diagram of the execution unit of the present invention;

[0032] Fig. 9 is an internal block diagram of a power compensation unit of the present invention;

[0033] In the figure: 1-power conversion unit; 11-first-stage power conversion unit; 12-second-stage power conversion unit; 2-local signal acquisition unit; 21-local input unit; 22-local signal frequency detection unit; 3-track signal acquisition unit; 31-track signal input unit; 32-track signal current conditioning unit; 33-track signal voltage conditioning unit; 34-track signal frequency detection unit; 4-power compensation unit; 41-execution unit; 42-compensation unit; 5-local output unit; 51-local output and control_1; 52-local output and control_2; 53-local output and control_3; 54-local output and control_4; 55-local output and control_5; 6-track output unit; 61-track output and control_1; 62-track output and control_2; 63-track output and control_3; 64-track output and control_4; 65-track output and control_5; 7-communication unit; 8-digital signal processing unit. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1, see Figure 1 An automatic power compensation calibration tool includes a track signal acquisition unit 3, whose input end is connected to the track signal; a local signal acquisition unit 2, whose input end is connected to the local signal; a digital signal processing unit 8, coupled to the output ends of the track signal acquisition unit 3 and the local signal acquisition unit 2, and calculating the compensation parameters according to the collected values ​​of the track signal acquisition unit 3 and the local signal acquisition unit 2; and also includes a power compensation unit 4, the power compensation unit 4 includes a connected execution unit 41 and a compensation unit 42, the execution unit 41 is connected to the digital signal processing unit 8, and the compensation unit 42 is connected to the track signal input unit 31 and the track output unit 6 respectively.

[0036] The calibration tool of this embodiment is powered by a power conversion unit 1, which includes a first-stage power conversion unit 11 and a second-stage power conversion unit 12. Figure 2As shown, the input 24VDC is first connected to the first-level power conversion unit through the diode D1 and converted into 5VDC. The first-level power conversion unit 11 supplies power to some units of the calibration tooling through the DC / DC output, where the input and output are isolated; the first-level power conversion unit 11 simultaneously outputs to the second-level power conversion unit 12, 5VDC is converted into 3.3VDC, and output to each unit of the calibration tooling for power supply.

[0037] In this embodiment, the track signal acquisition unit 3 includes a track signal input unit 31 connected to the track signal, and also includes a track signal voltage conditioning unit 33, a track signal current conditioning unit 32 and a track signal frequency detection unit 34 respectively connected to the track signal input unit 31 and the digital signal processing unit 8.

[0038] In this embodiment, Figure 3 As shown, the track signal input unit 31 includes a Hall sensor, a transformer T1 and a sampling resistor R2. The Hall sensor is connected to the track signal neutral line. The two ends of the primary winding of the transformer T1 are respectively connected to the Hall sensor and the live wire of the track signal. The secondary winding is connected to the sampling resistor R2 in parallel and then connected to the track signal voltage conditioning unit 33. A track signal frequency detection unit 34 and a track output unit 6 are also connected in parallel between the live wire of the track signal and the Hall sensor.

[0039] The track signal input unit 31 connects the fuse F1 to the live line (L line) of the track signal, connects the Hall sensor to the neutral line (N line) of the track signal, and outputs it to the track output unit 6; the current limiting resistor R1, transformer T1 and sampling resistor R2 convert the track high voltage signal into a low voltage signal, and output it to the track signal voltage conditioning unit 33; the Hall sensor on the N line converts the input current of the track signal into a voltage signal after internal conversion, and outputs it to the track signal current conditioning unit 32.

[0040] In this embodiment, Figure 4 As shown, the track signal current conditioning unit 32 includes an operational amplifier U1, a first input terminal of the operational amplifier U1 is connected to a resistor R3, a second input terminal is connected to a resistor R4 and then grounded, an output terminal is connected to a resistor R6, the resistor R3 is connected to a Hall sensor, the resistor R6 is respectively connected to a digital signal processing unit 8 and a capacitor C1, and a resistor R5 is connected between the first input terminal and the output terminal of the operational amplifier U1.

[0041] The track signal current conditioning unit 32 forms an amplifier circuit through an operational amplifier U1, a resistor R3, a resistor R4, and a resistor R5, and amplifies the output signal of the Hall sensor by multiples through the operational amplifier to improve the AD acquisition accuracy.

[0042] In this embodiment, Figure 5As shown, the track signal voltage conditioning unit 33 includes an operational amplifier U2, a first input terminal of the operational amplifier U2 is connected to a resistor R7, a second input terminal is connected to a resistor R8 and then grounded, an output terminal is connected to a resistor R10, the resistor R7 is connected to the secondary winding of the transformer T1, the resistor R10 is respectively connected to the digital signal processing unit 8 and the capacitor C2, and a resistor R9 is connected between the first input terminal and the output terminal of the operational amplifier U2. The principle of the track signal voltage conditioning unit 33 is similar to that of the track signal current conditioning unit 32, and is used to amplify the track low voltage signal converted by the transformer T1.

[0043] In this embodiment, Figure 6 As shown, the track signal frequency detection unit 34 includes an isolation optocoupler U3, one end of the isolation optocoupler U3 light emitter is connected in series with the resistor R11 and then connected to the track signal input unit 31, and a diode D2 is also connected between the two ends of the isolation optocoupler U3 light emitter, one end of its light receiver is grounded and the other end is respectively connected to the pull-up resistor R12 and the input end of the inverter U4, the pull-up resistor R12 is connected to the power supply, and the output end of the inverter U4 is connected to the digital signal processing unit 8.

[0044] In this embodiment, Figure 7 As shown, the local signal acquisition unit 2 includes a local input unit 21 and a local signal frequency detection unit 22. The local signal frequency detection unit 22 includes an isolation optocoupler U5. One end of the light emitter of the isolation optocoupler U5 is connected in series with a resistor R13 and then connected to the local input unit 21. A diode D3 is also connected between the two ends of the light emitter of the isolation optocoupler U5. One end of the light receiver is grounded and the other end is respectively connected to a resistor R14 and an input end of an inverter U6. The resistor R14 is connected to a power supply, and the output end of the inverter U6 is connected to a digital signal processing unit 8. Here, since the local voltage signal is 110VAC, resistors R13 and R14 are both chip resistors. In order to reduce power consumption and the influence of temperature, there are two current limiting resistors.

[0045] In this embodiment, Figure 8 As shown, the execution unit 41 includes 8 adjustment units, and the adjustment unit includes an optical coupler, one end of the optical coupler photoreceptor is connected to the digital signal processing unit 8, and the other end is connected in series with the current limiting resistor and then connected to the power supply; one end of the optical coupler photoreceptor is grounded, and the other end is connected to the relay coil and then connected to the power supply. The control signal of the execution unit 41 comes from the digital signal processing unit 8, and the combination of power compensation is controlled by the relay, and its output is connected to the execution unit 42.

[0046] In this embodiment, Fig. 9As shown, the compensation unit 42 includes capacitors corresponding to the number of adjustment units, and the number of capacitors is also 8, that is, the compensation capacity includes 8 levels, namely C1x, C2x...C8x. After the capacitors are connected to the normally open contacts of the relay and at both ends of the equivalent inductor, the track signal input unit 31 is also connected at both ends of the equivalent inductor.

[0047] In this embodiment, a communication unit connected to an external bus device is also included. The communication unit includes an R485 circuit composed of a communication management chip, which provides a friendly human-machine interface in an intuitive manner, making it easy to control the number of calibration modules and reactive compensation capacity.

[0048] The calibration method of this embodiment comprises the steps of:

[0049] S1: The track signal acquisition unit detects the actual power consumption parameter data of the calibrated load;

[0050] S2: The digital signal processing unit compares the actual power consumption parameter data of the calibration load and the compensation data of a single calibration module to obtain the actual number of calibration modules and the preset compensation parameters;

[0051] S3: The digital signal processing unit outputs a signal, and the execution unit invests compensation capacity according to preset compensation parameters;

[0052] S4: The track signal acquisition unit collects the power consumption parameter data of the compensated calibration load in real time, and the digital signal processing unit compares the power consumption parameter data collected by the local signal acquisition unit and obtains a deviation value;

[0053] S5: The digital signal processing unit outputs a signal, and the compensation unit invests compensation capacity according to the deviation value;

[0054] S7: Repeat S4-S5 until the deviation value obtained by the digital signal processing unit is within a preset range.

[0055] The specific implementation process is that during the calibration process, for the channel, its impedance Z = R + Xl (1)

[0056] Because the resistance R does not change with the change of voltage, its impedance Z=R is first measured by the DC measurement method; then a 25Hz AC signal is applied during calibration, and its inductive reactance Xl is calculated, and finally the value of the impedance Z is obtained.

[0057] For the calibrated channel, the apparent power S of the calibration module is divided into active power P and inductive reactive power Ql, and the formula is:

[0058] So, there is

[0059] Because the current of the inductive load lags behind the input voltage, while the current of the capacitive load leads the input voltage, when the capacitive load compensation power is equal to the inductive load, there is only pure resistive active power in the circuit, that is, the consumption is minimal. Generally, the compensation coefficient is selected to be 0.9 to 0.95; if it is too low, under-compensation will occur and the compensation effect will not be achieved; if it is too high, it is easy to over-compensate, which will also increase reactive power.

[0060] According to the formula: Power factor

[0061] Ql is the inductive reactive power, and the compensation capacity Qc is calculated according to formula (4) and formula (3).

[0062] In this embodiment, the track signal detection unit 3 performs AD acquisition of the input voltage and current of the track signal, and the digital signal processing unit 8 determines the load condition of the calibration module in combination with the state of the output relay, thereby calculating the inductive reactive power Ql of the channel.

[0063] The digital signal processing unit 8 obtains the capacity Qc that needs to be compensated through calculation, and outputs a control signal to control the normally open contact of the relay of the compensation unit 42 to close, thereby controlling the input parameters of the capacitor group by controlling the number of the capacitor group.

[0064] Due to the differences in channel parameters, as the number of calibration modules increases, the calculated parameters may be too large and need to be fine-tuned when compensation is required. On the basis of the compensation parameters, the power consumption current data of the compensated calibrated load is collected in real time by the track signal unit and compared with the collected value of the local signal acquisition unit 2. Since the local signal has no load and has a 90° phase offset with the track signal power consumption current, it can be used as a reference.

[0065] The digital signal processing unit 8 fine-tunes the compensation unit 42 of the corresponding capacity according to the numerical value and direction of the current deviation, and repeats the adjustment up to 3 times until the current deviation of the current signal conditioning unit 32 and the preset value is minimized and the compensation coefficient closest to the preset value is taken as the standard.

[0066] The present invention delivers reactive power compensation power in a closed-loop manner, thereby completing the calibration of multiple modules under very small input current conditions, improving waveform quality during calibration, saving time costs, and improving product cost performance.

[0067] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0068] In the description of the present invention, it should be noted that relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0069] In the description of the present invention, it is also necessary to explain that the orientations or positional relationships indicated by the terms "upper", "lower", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0070] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. An automatic power compensation calibration tool, comprising: A track signal acquisition unit (3), whose input end is connected to the track signal; A local signal acquisition unit (2), whose input end is connected to the local signal; A digital signal processing unit (8) is coupled to the output ends of the track signal acquisition unit (3) and the local signal acquisition unit (2), and calculates compensation parameters according to the acquisition values ​​of the track signal acquisition unit (3) and the local signal acquisition unit (2); It is characterized in that It also includes a power compensation unit (4), the power compensation unit (4) including an execution unit (41) and a compensation unit (42) connected to each other, the execution unit (41) is connected to the digital signal processing unit (8), and the compensation unit (42) is connected to the track signal input unit (31) and the track output unit (6) respectively; The track signal acquisition unit (3) comprises a track signal input unit (31) for receiving a track signal, and also comprises a track signal voltage conditioning unit (33), a track signal current conditioning unit (32) and a track signal frequency detection unit (34) respectively connected to the track signal input unit (31) and the digital signal processing unit (8); The track signal input unit (31) comprises a Hall sensor, a transformer T1 and a sampling resistor R2, the Hall sensor is connected to the track signal neutral line, the two ends of the primary winding of the transformer T1 are respectively connected to the Hall sensor and the live line of the track signal, and the secondary winding is connected in parallel with the sampling resistor R2 and then connected to the track signal voltage conditioning unit (33); the track signal frequency detection unit (34) and the track output unit (6) are also connected in parallel between the live line of the track signal and the Hall sensor; The track signal current conditioning unit (32) comprises an operational amplifier U1, a first input terminal of the operational amplifier U1 is connected to a resistor R3, a second input terminal is connected to a resistor R4 and then grounded, an output terminal is connected to a resistor R6, the resistor R3 is connected to the Hall sensor, the resistor R6 is respectively connected to a digital signal processing unit (8) and a capacitor C1, and a resistor R5 is connected between the first input terminal and the output terminal of the operational amplifier U1; The track signal voltage conditioning unit (33) comprises an operational amplifier U2, wherein a first input terminal of the operational amplifier U2 is connected to a resistor R7, a second input terminal is connected to a resistor R8 and then grounded, and an output terminal is connected to a resistor R10, wherein the resistor R7 is connected to a secondary winding of the transformer T1, and the resistor R10 is respectively connected to a digital signal processing unit (8) and a capacitor C2, and a resistor R9 is connected between the first input terminal and the output terminal of the operational amplifier U2.

2. The automatic power compensation calibration tool according to claim 1, characterized in that: The track signal frequency detection unit (34) comprises an isolation optocoupler U3, one end of the light emitter of the isolation optocoupler U3 is connected in series with a resistor R11 and then connected to the track signal input unit (31), a diode D2 is also connected between the two ends of the light emitter of the isolation optocoupler U3, one end of the light receiver is grounded and the other end is respectively connected to a pull-up resistor R12 and an input end of an inverter U4, the pull-up resistor R12 is connected to a power supply, and an output end of the inverter U4 is connected to the digital signal processing unit (8).

3. An automatic power compensation calibration tool according to claim 1 or 2, characterized in that: The local signal acquisition unit (2) comprises a local input unit (21) and a local signal frequency detection unit (22). The local signal frequency detection unit (22) comprises an isolation optocoupler U5. One end of the light emitter of the isolation optocoupler U5 is connected in series with a resistor R13 and then connected to the local input unit (21). A diode D3 is also connected between the two ends of the light emitter of the isolation optocoupler U5. One end of the light receiver is grounded and the other end is respectively connected to a resistor R14 and an input end of an inverter U6. The resistor R14 is connected to a power supply. The output end of the inverter U6 is connected to the digital signal processing unit (8).

4. The automatic power compensation calibration tool according to claim 1, characterized in that: The execution unit (41) includes at least two groups of adjustment units, and the adjustment unit includes an optical coupler, one end of the optical coupler photoreceptor is connected to the digital signal processing unit (8), and the other end is connected in series with a current limiting resistor and then connected to a power supply; one end of the optical coupler photoreceptor is grounded, and the other end is connected to a relay coil and then connected to a power supply.

5. The automatic power compensation calibration tool according to claim 3, characterized in that: The compensation unit (42) comprises capacitors whose number corresponds to the number of the adjustment units. The capacitors are connected to the normally open contacts of the relay and are located at both ends of the equivalent inductor. Both ends of the equivalent inductor are also connected to the track signal input unit (31).

6. The calibration method of the automatic power compensation calibration tool as claimed in claim 1, characterized in that: Includes steps: S1: The track signal acquisition unit (3) detects actual power consumption parameter data of the calibrated load; S2: The digital signal processing unit (8) compares the actual power consumption parameter data of the calibration load and the disability data of a single calibration module to obtain the actual number of calibration modules and the preset compensation parameters; S3: the digital signal processing unit (8) outputs a signal, and the execution unit (41) invests compensation capacity according to preset compensation parameters; S4: the track signal acquisition unit (3) acquires the power consumption parameter data of the compensated calibrated load in real time, and the digital signal processing unit (8) compares the power consumption parameter data acquired by the local signal acquisition unit (2) and obtains a deviation value; S5: the digital signal processing unit (8) outputs a signal, and the compensation unit (42) invests compensation capacity according to the deviation value; S7: Repeat S4-S5 until the deviation value obtained by the digital signal processing unit (8) is within a preset range.

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