Electromagnetic field test platform for simulating power grid event disturbances

Abstract

This invention provides an electromagnetic field test platform for simulating power grid event-driven disturbances, comprising a power supply module, a comprehensive control and display module, a phase control module, a power frequency electric field generation module, a power frequency magnetic field generation module, an impulse magnetic field generation module, and a waveform measurement module. The power supply module provides high-power power to the simulation platform. The comprehensive control and display module centrally controls the generation of the power frequency electric field, power frequency magnetic field, and impulse magnetic field, and displays parameters such as output voltage, current, and phase. The phase control module controls the impulse magnetic field generation module to output the impulse magnetic field in arbitrary superposition phase with the power frequency magnetic field and power frequency electromagnetic field. The waveform measurement module realizes the synchronous measurement of power frequency high voltage, power frequency current, and impulse current waveforms. This invention can simulate the simultaneous output of power frequency electric field, power frequency magnetic field, and impulse magnetic field, and the impulse magnetic field and power frequency electromagnetic field can be superimposed in arbitrary phase, meeting the electromagnetic field environment requirements of online monitoring devices or live-line testing instruments during laboratory calibration.

Description

Technical Field

[0001] The invention relates to the technical field of detection and calibration of electrical equipment status detection instrument devices, and in particular to an electromagnetic field test platform for simulating power grid event disturbances. Background Art

[0002] There are power frequency electric fields, power frequency magnetic fields, impulse interference, radio interference, noise interference, etc. in the operating transmission lines and substations. The live detection instruments currently used in large quantities detect the operating parameters of electrical equipment in the live state. They are very susceptible to various electromagnetic interferences during use, causing data instability and other problems; and the online monitoring devices widely installed in substations will have their performance reduced or even lost after long-term operation in a complex electromagnetic environment, and will not be able to play the monitoring and early warning effect they should. Therefore, before and during the use of live detection instruments and online monitoring devices, the performance of these instruments needs to be fully tested. Testing and evaluating the reliability and accuracy of instruments and devices in an electromagnetic interference environment can identify the performance of live detection instruments and online monitoring devices, and avoid the use of unreliable and inaccurate detection instruments and monitoring devices. It is one of the important inspection items in the power industry.

[0003] Power frequency electric field and power frequency magnetic field are the main interference sources that exist stably at the power transmission and transformation site, which are convenient for measurement, collection and laboratory simulation. CN201810516630.2 discloses a power frequency electromagnetic field generation platform for simulating the substation site, which simulates and generates power frequency electric field and power frequency magnetic field environment equivalent to the substation site in the laboratory.

[0004] The inventor of the present application has found through research in the process of realizing the present invention that lightning overvoltage and operation overvoltage often occur on the transmission lines and substations, which will cause the arrester to operate and discharge the impact current, thereby causing transient electromagnetic processes on the electrical equipment; in addition, the normal opening and closing process of switches and knife switches is also accompanied by changes in transient currents, thereby generating pulsed electromagnetic disturbances. These sudden and transient power grid event processes generate instantaneous, pulsed large currents around the transmission lines and in the substations, and the accompanying impact pulse magnetic fields are superimposed on the stable power frequency electric and magnetic fields, causing transient impacts on the online monitoring devices installed in the transmission lines and substations. The huge interference signals will affect the measurement performance of the online monitoring devices and live detection instruments, and even damage their sensors or sampling units. Therefore, simulating the impact magnetic field generated by power grid event disturbances has important practical significance for objectively and comprehensively evaluating online monitoring devices and live detection instruments. Since the impact pulse magnetic field is sudden and random, when simulating it in the laboratory, it is required that the impact magnetic field can be superimposed on the power frequency electromagnetic field with any phase difference. At present, no research reports on this aspect have been seen at home and abroad. Summary of the invention

[0005] The present invention provides an electromagnetic field test platform for simulating power grid event disturbances, which can realize the simultaneous output of power frequency electric field, power frequency magnetic field and impact magnetic field. The electric field strength and magnetic field strength are continuously adjustable. The maximum power frequency electric field strength is 100kV / m, the maximum power frequency magnetic field strength is 1mT, and the maximum impact magnetic field strength is 1mT. The impact magnetic field and the power frequency electromagnetic field can be superimposed at any phase, which fully meets the test requirements of simulating on-site power frequency electromagnetic fields and impact pulse magnetic fields.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] An electromagnetic field test platform for simulating power grid event disturbances, including a power supply module, an integrated control and display module, a phase control module, an industrial frequency electric field generation module, an industrial frequency magnetic field generation module, an impact magnetic field generation module, and a waveform measurement module;

[0008] The output end of the power module is connected to the power input end of the integrated control and display module and the phase control module, and is used to provide power for the entire power grid event disturbance electromagnetic characteristic parameter simulation generation platform;

[0009] The integrated control and display module is respectively connected to the power frequency electric field generation module, the power frequency magnetic field generation module, and the impact magnetic field generation module, and is used to centrally control the generation and shutdown of the power frequency electric field, the power frequency magnetic field, and the impact magnetic field, and simultaneously display the voltage value, current value, and phase output by the simulation generation platform; the integrated control and display module is also connected to the phase control module, and is used to send the superimposed phase difference of the impact magnetic field and the power frequency electromagnetic field set by the integrated control and display module to the phase control module;

[0010] The output end of the phase control module is connected to the switch signal input end of the impact magnetic field generation module, and is used to control the switch signal input end to achieve superposition output of the impact magnetic field and the power frequency electromagnetic field with an arbitrary phase difference;

[0011] The power frequency electric field generating module is used to generate a power frequency electric field, and the power frequency high voltage outputted by it is connected to the first measurement channel input terminal of the waveform measurement module; the power frequency magnetic field generating module is used to generate a power frequency magnetic field, and the power frequency current outputted by it is connected to the second measurement channel input terminal of the waveform measurement module; the impulse magnetic field generating module is used to generate a high frequency impulse magnetic field, and the impulse current outputted by it is connected to the third measurement channel input terminal of the waveform measurement module;

[0012] The waveform measurement module is used to synchronously measure the power frequency high voltage, power frequency current and impulse current waveforms to verify whether the impulse magnetic field and the power frequency electromagnetic field are superimposed and output according to a predetermined phase difference.

[0013] Furthermore, the phase control module includes a voltage signal sampling and conditioning module, a phase-locked frequency multiplication module, and a microcontroller delay module which are cascaded in sequence;

[0014] The voltage signal sampling and conditioning module is used to sample and condition the voltage of the power frequency electromagnetic field excitation source, and then input it into the phase-locked frequency multiplication module for phase tracking locking and frequency multiplication processing, and then input it into the microcontroller delay module. The microcontroller delay module adjusts the phase of the impact magnetic field by controlling the number of delayed pulses of the impact current relative to the power frequency electromagnetic field excitation source voltage signal. When the phase of the impact magnetic field is adjusted to reach the preset phase of the integrated control and display module, the microcontroller delay module outputs a switching signal to control the discharge output module in the impact magnetic field generation module to turn on, and the impact current is output, thereby generating an impact magnetic field superimposed with the power frequency electromagnetic field at a preset phase difference.

[0015] Furthermore, the impact magnetic field generating module includes a boost and rectification charging module, a discharge output module, and an impact current coil device connected in sequence; the boost and rectification charging module is used to boost and rectify the impact magnetic field excitation source voltage and charge the high-voltage energy storage capacitor, the voltage across the high-voltage energy storage capacitor is connected to the voltage input end of the discharge output module, the switch signal input end of the discharge output module is connected to the output end of the phase control module, the discharge output module is controlled to be disconnected by the switch signal output by the phase control module, and the output end of the discharge output module is connected in series to the impact current coil device to form a complete impact current loop.

[0016] Furthermore, the discharge output module includes a transistor Q1, a current limiting resistor R1, and a thyristor T1. The switching signal output by the phase control module is connected to the base b of the transistor Q1 as the input signal Vi for controlling the discharge output module. The voltage output by the boost and rectifier charging module is connected to the collector of the transistor Q1 in series with the current limiting resistor R1 as the power supply +Vcc, and the emitter of the transistor Q1 is connected to the ground potential; the control electrode G of the thyristor T1 is connected to the positive power supply +Vcc; the anode A terminal and the cathode K terminal of the thyristor T1 are connected in series in the impact magnetic field discharge output circuit.

[0017] Furthermore, when the input signal Vi is at a low level, the transistor Q1 is not turned on, the control electrode G of the thyristor T1 has no trigger current, the thyristor T1 is not turned on, and no impact current is generated; when the input signal Vi is at a high level, the transistor Q1 is turned on, the control electrode G of the thyristor T1 has a trigger current, the thyristor T1 is turned on, and an impact current is generated.

[0018] Furthermore, the impulse current coil device is fixed inside the power frequency magnetic field coil and is vertically and equidistantly placed on the left and right sides of the power frequency electric field generating module to form an impulse magnetic field in an effective area.

[0019] Furthermore, the impulse current coil device includes an incoming copper bar, an impulse current coil, and an outgoing copper bar; the impulse current flows into the impulse current coil through the incoming copper bar connected to the positive end of the shock wave output, and after the impulse current flows through the left and right impulse current coils, it flows out through the outgoing copper bar and returns to the negative end of the shock wave output, forming a complete impulse current loop.

[0020] Furthermore, the materials of the incoming copper busbar and the outgoing copper busbar are both 40mm wide and 5mm thick red copper busbars, and are bent at 90° to facilitate wiring.

[0021] Furthermore, the impulse current coil is a copper bar current-carrying loop, in which every 4 copper bars form a coil turn, the number of coil turns is 3 turns, the coil spacing is 100mm~150mm, the coil side length is 1200mm~1700mm, and the coil material is a copper bar with a width of 40mm and a thickness of 5mm, which meets the current carrying requirement of 10kA impulse current.

[0022] Furthermore, the impulse current coil device also includes a first nylon clamp and a second nylon clamp. The first nylon clamp is used to fix and clamp the impulse current coil and the industrial frequency magnetic field coil at the same time, and is used in conjunction with the second nylon clamp to further clamp them. The first nylon clamp and the second nylon clamp are both made of nylon with a thickness of 30 mm and a width of 100 mm.

[0023] The present invention has the following advantages and positive effects:

[0024] 1) The present invention provides an electromagnetic field test platform for simulating power grid event disturbances, which can provide a complex electromagnetic field interference environment close to the actual working conditions of the power transmission and transformation site for the inspection of online monitoring devices and live detection instruments in the laboratory, and can meet the simultaneous output of power frequency electric field, power frequency magnetic field and impact magnetic field;

[0025] 2) The power frequency electric field, power frequency magnetic field and impact magnetic field designed by the present invention have a wide range, which can fully meet the calibration requirements of laboratory online monitoring devices and live detection instruments; wherein, the power frequency electric field generating module can output power frequency high voltage of (0-100) kV, and realize the continuous output of power frequency electric field in the electric field strength range of (0-100) kV / m; the power frequency magnetic field generating module can output power frequency current of (0-1) kA, and realize the continuous output of power frequency magnetic field in the magnetic field strength range of (0-1) mT; the impact magnetic field generating module can output high frequency impact current of (0-10) kA and 8 / 20uS, and realize the impact magnetic field output of high frequency impact magnetic field strength of (0-1) mT;

[0026] 3) The present invention can realize the superposition of the impact magnetic field and the power frequency electromagnetic field with arbitrary phases, ensuring the authenticity of the electromagnetic field phase of the simulated on-site operating substation in a laboratory environment;

[0027] 4) The present invention takes into account the compatibility of industrial frequency electric field test, industrial frequency magnetic field test and impact magnetic field test. Each generating module is integrated into one in structure and comprehensive control, which not only ensures the superposition of simultaneous output of industrial frequency electric field, industrial frequency magnetic field and impact magnetic field, but also ensures the independence of the individual output of each generating module. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of one embodiment of an electromagnetic field test platform for simulating power grid event disturbance provided by the present invention;

[0029] Figure 2 is a circuit principle block diagram of a phase control module in an embodiment of the present invention;

[0030] Figure 3 is a circuit principle block diagram of an impact magnetic field generating module in an embodiment of the present invention;

[0031] Figure 4 It is a circuit diagram of a discharge output module in an impact magnetic field generating module of the present invention;

[0032] Figure 5 Schematic diagram of the structure of the impulse current coil device in the embodiment of the present invention.

[0033] The reference numerals in the figures are described as follows:

[0034] 1-power supply module, 2-integrated control and display module, 3-phase control module; 4-power frequency electric field generating module, 5-power frequency magnetic field generating module, 6-impact magnetic field generating module, 7-waveform measurement module; 3.1-voltage signal sampling and conditioning module, 3.2-phase-locked frequency multiplication module, 3.3-microcontroller delay module; Vi-discharge output module input signal; +Vcc-thyristor switch circuit power supply; Q1-transistor, R1-current limiting resistor, T1-thyristor; 6.1-boost and rectifier charging module, 6.2-discharge output module, 6.3-impact current coil device; 5.1-power frequency magnetic field coil, 6.3.1-incoming copper plate, 6.3.2-impact current coil, 6.3.3-outgoing copper plate, 6.3.4-first nylon clamp, 6.3.5-second nylon clamp. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0036] Figure 1The figure shows a schematic diagram of the structure of one embodiment of the electromagnetic field test platform for simulating power grid event disturbances of the present invention. The electromagnetic field test platform for simulating power grid event disturbances includes a power supply module 1, an integrated control and display module 2, a phase control module 3, an industrial frequency electric field generating module 4, an industrial frequency magnetic field generating module 5, an impact magnetic field generating module 6, and a waveform measurement module 7.

[0037] The output end of the power supply module 1 is connected to the power supply input end of the integrated control and display module 2 and the phase control module 3, providing a high-power power supply for the entire power grid event disturbance electromagnetic characteristic parameter simulation generation platform.

[0038] The integrated control and display module 2 is connected to the industrial frequency electric field generating module 4, the industrial frequency magnetic field generating module 5, and the impact magnetic field generating module 6 respectively, and is used to centrally control the generation and shutdown of the industrial frequency electric field, the industrial frequency magnetic field, and the impact magnetic field, and at the same time display the voltage value, current value and phase output by the simulation generating platform; the integrated control and display module 2 is also connected to the phase control module 3, and is used to send the superimposed phase value of the impact magnetic field and the industrial frequency electromagnetic field set by the integrated control and display module 2 to the phase control module 3.

[0039] The output end of the phase control module 3 is connected to the switch signal input end of the impact magnetic field generating module 6, and is used to control the impact magnetic field generating module 6 to output the impact magnetic field and the industrial frequency electromagnetic field with an arbitrary superposition phase according to the superposition phase value of the impact magnetic field and the industrial frequency electromagnetic field set by the comprehensive control and display module 2.

[0040] The power frequency electric field generating module 4 is used to generate a power frequency electric field, and the power frequency high voltage outputted by it is connected to the first measurement channel input terminal of the waveform measurement module 7; the power frequency magnetic field generating module 5 is used to generate a power frequency magnetic field, and the power frequency current outputted by it is connected to the second measurement channel input terminal of the waveform measurement module 7; the impulse magnetic field generating module 6 is used to generate a high frequency impulse magnetic field, and the impulse current outputted by it is connected to the third measurement channel input terminal of the waveform measurement module 7;

[0041] The waveform measurement module 7 is used to synchronously measure the power frequency high voltage, power frequency current and impulse current waveforms, and verify the superposition phase output function of the impulse magnetic field and the power frequency electromagnetic field.

[0042] The specific implementation method of the present invention is:

[0043] The tested online monitoring device or live detection instrument is placed on an electromagnetic field test platform simulating an event disturbance of the power grid. The test personnel set and adjust parameters such as voltage, current and phase at the operating console of the integrated control and display module 2, control the generation of power frequency high voltage, power frequency large current, and impact magnetic field boost rectification and charging action, the power frequency electric field generation module 4 generates a power frequency electric field, and the power frequency magnetic field generation module 5 generates a power frequency magnetic field; when the voltage across the high-voltage energy storage capacitor of the impact magnetic field generation module 6 rises to the set voltage, it is temporarily not discharged, and when the phase control module 3 adjusts the superposition phase between the impact magnetic field and the power frequency electromagnetic field to reach the preset phase, the phase control module 3 controls the impact magnetic field discharge circuit of the impact magnetic field generation module 6 to start discharging, generating an impact magnetic field, which is superimposed on the power frequency electric field and the power frequency magnetic field, and jointly generates a complex electromagnetic environment in the test area; at the same time, the power frequency electric field high voltage waveform, the power frequency magnetic field large current waveform and the impact magnetic field high frequency impact current waveform are input to the waveform measurement module for synchronous measurement to verify whether the superposition phase of the impact magnetic field and the power frequency electromagnetic field is output according to the preset value.

[0044] The structure of each functional block in the present invention is specifically described as follows:

[0045] 1. Power module 1

[0046] The power module 1 is a 220V industrial frequency mains power supply, which is used to provide a high-power power supply for the entire power grid event disturbance electromagnetic characteristic parameter simulation generation platform. Considering the different output powers of the industrial frequency electric field generation module 4, the industrial frequency magnetic field generation module 5, and the impact magnetic field generation module 6, the cross-sectional area of ​​the power lines of each module is different. Specifically, the industrial frequency electric field generation module 4 adopts a cross-sectional area of ​​6mm 2 The power cord obtains low-power power from a 220V industrial frequency mains socket; the industrial frequency magnetic field generating module 5 and the impact magnetic field generating module 6 both adopt a cross-sectional area of ​​35mm 2 The dedicated current booster high-power input power cord obtains high-power power from the 220V industrial frequency mains socket.

[0047] 2. Integrated control and display module 2

[0048] The integrated control and display module 2 is an integrated control and display console that integrates the power frequency high voltage generation control system, the power frequency large current generation control system and the impact magnetic field impact current generation control system. It is used to centrally control the generation and shutdown of the power frequency electric field, the power frequency magnetic field and the impact magnetic field, and at the same time displays the parameters such as the electric field high voltage value, the power frequency magnetic field large current value and the impact magnetic field large current value output by the simulation generation platform; at the same time, the integrated control and display module 2 is equipped with an output current overcurrent protection device. Once the overcurrent output is output, the output voltage is automatically disconnected to prevent accidental discharge and ensure the safety of the test. The console of the integrated control and display module 2 can manually preset the expected impact magnetic field phase value superimposed on the power frequency electromagnetic field according to the test requirements, and cooperate with the phase control module 3 to realize the superimposed output of the impact magnetic field of the preset phase on the power frequency electromagnetic field.

[0049] 3. Phase control module 3

[0050] like Figure 2 As shown, the phase control module 3 includes a voltage signal sampling and conditioning module 3.1, a phase-locked frequency multiplication module 3.2, and a microcontroller delay module 3.3 which are cascaded in sequence.

[0051] The voltage signal sampling and conditioning module 3.1 is used to sample and condition the voltage of the power frequency electromagnetic field excitation source, and then input it into the phase-locked frequency multiplication module 3.2 for phase tracking locking and frequency multiplication processing, and then input it into the microcontroller delay module 3.3. The microcontroller delay module 3.3 adjusts the phase of the impact magnetic field by controlling the number of delayed pulses of the impact current relative to the power frequency electromagnetic field excitation source voltage signal. When the phase of the impact magnetic field is adjusted to reach the preset phase of the integrated control and display module 2, the microcontroller delay module 3.3 outputs a high level, which is input as a switch signal of the phase control module 3 to the switch signal output end of the impact magnetic field generating module 6, thereby controlling the discharge output module 6.2 (such as Figure 3 As shown in the figure, the impulse current is output, thereby generating an impulse magnetic field superimposed with the power frequency electromagnetic field at a preset phase. For example, the phase-locked frequency multiplication module 3.2 multiplies the 50Hz frequency by 1000 times to 50kHz, the number of pulses in 20ms is 1000, the corresponding time of 1 pulse is 20μs, and the corresponding phase is 0.36°. The corresponding number of pulses can be converted from the set superposition phase.

[0052] 4. Power frequency electromagnetic field generation module

[0053] The industrial frequency electric field generating module 4 includes a control console, a current booster or an industrial frequency high current generator, and an industrial frequency magnetic field coil, wherein the control console controls the current booster or the industrial frequency high current generator to output current, and the current passes through the industrial frequency magnetic field coil to generate a magnetic field in the test area around the coil.

[0054] The power frequency electric field generating module 4 and the power frequency magnetic field generating module 5 both realize continuous output of power frequency electric field and magnetic field through program-controlled voltage regulation, wherein the continuous output range of power frequency high voltage is (0-100) kV, thereby realizing continuous output of power frequency electric field in the electric field strength range of (0-100) kV / m; the continuous output range of power frequency current is (0-1) kA, thereby realizing continuous output of power frequency magnetic field in the magnetic field strength range of (0-1) mT.

[0055] 5. Impact magnetic field generation module 6

[0056] like Figure 3 As shown, the impact magnetic field generating module 6 includes a boost and rectification charging module 6.1, a discharge output module 6.2, and an impact current coil device 6.3 which are connected in sequence; the boost and rectification charging module 6.1 is used to boost and rectify the impact magnetic field excitation source voltage and charge the high-voltage energy storage capacitor, the voltage across the high-voltage energy storage capacitor is connected to the voltage input end of the discharge output module 6.2, the switch signal input end of the discharge output module 6.2 is connected to the output end of the microcontroller delay module 3.3 of the phase control module 3, the discharge output module 6.2 is controlled to be disconnected by the switch signal output by the microcontroller delay module 3.3, and the output end of the discharge output module 6.2 is connected in series to the impact current coil device 6.3 to form a complete impact current loop.

[0057] Among them, Figure 4 As shown, the discharge output module 6.2 includes a transistor Q1, a current limiting resistor R1, and a thyristor T1. The switch signal output by the microcontroller delay module 3.3 is connected to the base b of the transistor Q1 as the input signal Vi. The voltage output by the boost and rectifier charging module 6.1 is connected to the collector of the transistor Q1 in series with the current limiting resistor R1 as the power supply +Vcc, and the emitter of the transistor Q1 is connected to the ground potential; the control electrode G of the thyristor T1 is connected to the positive power supply +Vcc; the anode A terminal and the cathode K terminal of the thyristor T1 are connected in series in the impulse magnetic field discharge output circuit. When the input signal Vi is at a low level, the transistor Q1 is not turned on, the control electrode G of the thyristor T1 has no trigger current, the thyristor T1 is not turned on, and no impulse current is generated; when the input signal Vi is at a high level, the transistor Q1 is turned on, the control electrode G of the thyristor T1 has a trigger current, the thyristor T1 is turned on, and the impulse current is generated.

[0058] In specific implementation, the phase control module 3 counts the double frequency pulses starting from the zero crossing point, and when the set count value is reached, a control pulse, i.e. a switch signal, is sent to control the thyristor T1 to turn on for discharge, and the impulse current is output to the coil, thereby generating an impulse magnetic field in the test area.

[0059] The transistor Q1 is a 9013 NPN transistor; the current limiting resistor R1 is 10k; the power supply +Vcc is +5V; considering that the shock wave voltage of the impact magnetic field discharge circuit is as high as 20kV, four 5kV / 10kA thyristors are selected in series for voltage division. The overall equivalent of the four series thyristors is Figure 3 T1 in the circuit, and the four thyristor control electrodes are connected together, which is equivalent to Figure 3 The control electrode G of T1 in the circuit is controlled by the thyristor switch circuit to control whether a trigger current is generated at the control electrode G of the thyristor, thereby controlling whether the thyristor T1 is turned on, thereby realizing the switch control function of the impact magnetic field current loop.

[0060] The impulse current coil device 6.3 is fixed inside the power frequency magnetic field coil 5.1 in the power frequency magnetic field generating module 5, and is vertically and equidistantly placed on the left and right sides of the power frequency electric field generating module 4 to form an impulse magnetic field in an effective area.

[0061] like Figure 5 As shown, the impact current coil device 6.3 includes: an incoming copper busbar 6.3.1, an impact current coil 6.3.2, an outgoing copper busbar 6.3.3, a first nylon clamp 6.3.4, and a second nylon clamp 6.3.5; the positive end of the impact wave output of the impact current output by the discharge output module 6.2 flows into the impact current coil 6.3.2 through the incoming copper busbar 6.3.1, and after the impact current flows through the left and right impact current coils 6.3.2, it flows out through the outgoing copper busbar 6.3.3 and returns to the negative end of the impact wave output, forming a complete impact current loop.

[0062] The materials of the incoming copper bar 6.3.1 and the outgoing copper bar 6.3.3 are both 40mm wide and 5mm thick copper bars, and are bent 90° to facilitate wiring;

[0063] The impulse current coil 6.3.2 is a copper bar current-carrying loop. Every 4 copper bars form a coil turn. The number of coil turns is 3. The coil spacing is 100mm~150mm. The coil side length is 1200mm~1700mm. The coil material is a copper bar with a width of 40mm and a thickness of 5mm, which meets the 10kA impulse current carrying requirement.

[0064] The first nylon clamp 6.3.4 fixes and clamps the impulse current coil 6.3.2 and the power frequency magnetic field coil 5.1 at the same time. Considering that the copper tube wire diameter of the power frequency magnetic field coil 5.1 is relatively thick, the second nylon clamp 6.3.5 is used to further clamp it; by symmetrically installing the first nylon clamp 6.3.4 and the second nylon clamp 6.3.5 at the centers of the four sides of the power frequency magnetic field coil 5.1 and the impulse current coil 6.3.2, the stability of the overall coil of the simulation generating platform is ensured; the first nylon clamp 6.3.4 and the second nylon clamp 6.3.4 are both made of nylon with a thickness of 30mm and a width of 100mm.

[0065] The specific implementation process of the impact magnetic field generating module 6 is as follows: according to GBT 17626.8-2006 electromagnetic compatibility test and measurement technology, the impact current generating circuit provided in the pulse magnetic field immunity test designs the discharge loop capacitance, inductance, impedance and other parameters; after the boost voltage is converted into high voltage rectification, the high-voltage energy storage capacitor is charged. When the voltage across the high-voltage energy storage capacitor reaches the set value, at the same time, when the phase control module 3 adjusts the phase of the impact magnetic field to reach the preset phase, the discharge loop thyristor is turned on to control the discharge of the discharge loop to achieve 8 / 20μs impact current output, and the output impact current is injected into the impact current coil device 6.3 to generate the impact magnetic field required for the test.

[0066] 6. Waveform measurement module 7

[0067] like Figure 1 As shown, the waveform measurement module 7 has three input channels, which respectively input the power frequency electric field high voltage waveform, the power frequency magnetic field large current waveform and the impact magnetic field high frequency impact current waveform; the specific implementation process of the waveform measurement module 7 is: first, the power frequency electric field high voltage, the power frequency magnetic field large current and the impact magnetic field high frequency impact current original signals are collected, the high voltage can be sampled by a resistor divider, and the large current can be sampled by a shunt, and then the sampled signal is conditioned into a signal that can be received by the oscilloscope, and finally sent to the three input terminals of the oscilloscope for waveform synchronous measurement. On the one hand, the waveforms and amplitudes of the three signals of the power frequency electric field high voltage, the power frequency magnetic field large current and the impact magnetic field high frequency impact current can be intuitively observed, and on the other hand, the phase information of the above three signals can be read to check whether the impact magnetic field and the power frequency electromagnetic field are superimposed and output according to the preset phase difference.

[0068] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electromagnetic field test platform for simulating power grid event disturbances, characterized by: It comprises a power supply module (1), an integrated control and display module (2), a phase control module (3), an industrial frequency electric field generating module (4), an industrial frequency magnetic field generating module (5), an impact magnetic field generating module (6), and a waveform measuring module (7); The output end of the power module (1) is connected to the power input end of the integrated control and display module (2) and the phase control module (3), and is used to provide power for the entire power grid event disturbance electromagnetic characteristic parameter simulation generation platform; The integrated control and display module (2) is connected to the power frequency electric field generation module (4), the power frequency magnetic field generation module (5), and the impact magnetic field generation module (6) respectively, and is used to centrally control the generation and shutdown of the power frequency electric field, the power frequency magnetic field, and the impact magnetic field, and simultaneously display the voltage value, current value, and phase output by the electromagnetic field test platform; the integrated control and display module (2) is also connected to the phase control module (3), and is used to send the impact magnetic field and the power frequency electromagnetic field superposition phase value set by the integrated control and display module (2) to the phase control module (3); The output end of the phase control module (3) is connected to the switch signal input end of the impact magnetic field generating module (6) and is used to control the switch signal input end to achieve a superposition output of any phase difference between the impact magnetic field and the power frequency electromagnetic field; The power frequency electric field generating module (4) is used to generate a power frequency electric field, and the power frequency high voltage outputted by the module is connected to the first measurement channel input end of the waveform measuring module (7); The power frequency magnetic field generating module (5) is used to generate a power frequency magnetic field, and the power frequency current outputted by the module is connected to the second measurement channel input end of the waveform measuring module (7); The impact magnetic field generating module (6) is used to generate a high-frequency impact magnetic field, and the impact current outputted by the module is connected to the third measurement channel input end of the waveform measuring module (7); The waveform measurement module (7) is used to synchronously measure the power frequency high voltage, power frequency current and impulse current waveforms, and verify whether the impulse magnetic field is superimposed on the power frequency electromagnetic field and output according to a preset phase difference; The power module (1) is 220V industrial frequency mains electricity.

2. The electromagnetic field test platform for simulating power grid event disturbance according to claim 1, characterized in that: The phase control module (3) comprises a voltage signal sampling and conditioning module (3.1), a phase-locked frequency multiplication module (3.2), and a microcontroller delay module (3.3) which are cascaded in sequence; The voltage signal sampling and conditioning module (3.1) is used to sample and condition the voltage of the power frequency electromagnetic field excitation source, and then input it into the phase-locked frequency multiplication module (3.2) for phase tracking locking and frequency multiplication processing, and then input it into the microcontroller delay module (3.3). The microcontroller delay module (3.3) adjusts the phase of the impact magnetic field by controlling the delay pulse number of the impact current relative to the power frequency electromagnetic field excitation source voltage signal. When the phase of the impact magnetic field is adjusted to reach the preset phase of the integrated control and display module (2), the microcontroller delay module (3.3) outputs a switch signal to control the discharge output module (6.2) in the impact magnetic field generation module (6) to conduct, and the impact current is output, thereby generating an impact magnetic field superimposed with the power frequency electromagnetic field at a preset phase.

3. The electromagnetic field test platform for simulating power grid event disturbance according to claim 1 or 2, characterized in that: The impact magnetic field generating module (6) comprises a boost and rectification charging module (6.1), a discharge output module (6.2), and an impact current coil device (6.3) which are connected in sequence; the boost and rectification charging module (6.1) is used to boost and rectify the impact magnetic field excitation source voltage and to charge the high-voltage energy storage capacitor; the voltage at both ends of the high-voltage energy storage capacitor is connected to the voltage input end of the discharge output module (6.2); the switch signal input end of the discharge output module (6.2) is connected to the output end of the phase control module (3); the discharge output module (6.2) is switched on and off by the switch signal output by the phase control module (3); the output end of the discharge output module (6.2) is connected in series to the impact current coil device (6.3) to form a complete impact current loop.

4. The electromagnetic field test platform for simulating power grid event disturbance according to claim 3, characterized in that: The discharge output module (6.2) comprises a transistor Q1, a current limiting resistor R1, and a thyristor T1. The switching signal output by the phase control module (3) is connected to the base b of the transistor Q1 as an input signal Vi for controlling the discharge output module (3.4). The voltage output by the boost and rectifier charging module (6.1) is connected to the collector of the transistor Q1 in series with the current limiting resistor R1 as a power supply +Vcc. The emitter of the transistor Q1 is connected to the ground potential. The control electrode G of the thyristor T1 is connected to the positive power supply +Vcc. The anode A terminal and the cathode K terminal of the thyristor T1 are connected in series in the impulse magnetic field discharge output circuit.

5. The electromagnetic field test platform for simulating power grid event disturbance according to claim 4, characterized in that: When the input signal Vi is at a low level, the transistor Q1 is not turned on, the control electrode G of the thyristor T1 has no trigger current, the thyristor T1 is not turned on, and no impact current is generated; when the input signal Vi is at a high level, the transistor Q1 is turned on, the control electrode G of the thyristor T1 has a trigger current, the thyristor T1 is turned on, and an impact current is generated.

6. The electromagnetic field test platform for simulating power grid event disturbance as claimed in claim 3, characterized in that: The impulse current coil device (6.3) is fixed inside the power frequency magnetic field coil (5.1) and is vertically and equidistantly placed on the left and right sides of the power frequency electric field generating module (4) to form an impulse magnetic field in an effective area.

7. The electromagnetic field test platform for simulating power grid event disturbance according to claim 6, characterized in that: The impulse current coil device (6.3) comprises an incoming copper busbar (6.3.1), an impulse current coil (6.3.2), and an outgoing copper busbar (6.3.3); the positive end of the impulse wave output flows into the impulse current coil (6.3.2) through the incoming copper busbar (6.3.1), and the impulse current flows through the left and right impulse current coils (6.3.2), then flows out through the outgoing copper busbar (6.3.3) and returns to the negative end of the impulse wave output, thus forming a complete impulse current loop.

8. The electromagnetic field test platform for simulating power grid event disturbance according to claim 7, characterized in that: The materials of the incoming copper busbar (6.3.1) and the outgoing copper busbar (6.3.3) are both 40mm wide and 5mm thick red copper busbars, and are bent 90° to facilitate wiring.

9. The electromagnetic field test platform for simulating power grid event disturbance according to claim 7, characterized in that: The impulse current coil (6.3.2) is a copper bar current-carrying circuit. Every 4 copper bars form a coil turn. The number of coil turns is 3 turns. The coil spacing is 100mm~150mm. The coil side length is 1200mm~1700mm. The coil material is a copper bar with a width of 40mm and a thickness of 5mm, which meets the current-carrying requirements of 10kA impulse current.

10. The electromagnetic field test platform for simulating power grid event disturbance according to claim 7, characterized in that: The impulse current coil device (6.3) further comprises a first nylon clamp (6.3.4) and a second nylon clamp (6.3.5); the first nylon clamp (6.3.4) is used to simultaneously fix and clamp the impulse current coil (6.3.2) and the power frequency magnetic field coil (5), and is used in conjunction with the second nylon clamp (6.3.4) to further clamp them; the first nylon clamp (6.3.4) and the second nylon clamp (6.3.5) are both made of nylon with a thickness of 30 mm and a width of 100 mm.

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