CN115549651A - Impulse current generator for simulating multiple lightning strokes - Google Patents

Abstract

The invention discloses an impulse current generator for simulating multiple lightning strikes, which belongs to the field of relay protection for new power systems. The circuit topology consists of pulse modules that can be stacked vertically, charging modules, blocking modules, pulse modules that can be stacked horizontally, and the load module under test. The basic principle is: vertically stackable pulse modules are used to control the charging voltage required by different levels of lightning current amplitudes, and horizontally stackable pulse modules control the number of lightning currents with different multiples. Using the insulated gate bipolar transistor and the anti-parallel diode in the pulse module that can be stacked vertically or the pulse module that can be stacked horizontally switches the charging and discharging circuit of the impulse current generator for multiple lightning strikes, which can effectively shorten the switching points in the discharging circuit. The operation time of the combined state; the stability and reliability of the operation of the impulse current generator for multiple lightning strikes are improved, so that the impulse current generated by the current generator is closer to the actual multiple lightning current waveform.

Description

A Impulse Current Generator for Simulating Multiple Lightning Strikes

technical field

The invention belongs to the field of relay protection of new power systems, and in particular relates to an impulse current generator for simulating multiple lightning strikes.

Background technique

Lightning is a natural phenomenon of gas discharge in nature. Its high-frequency lightning current poses a great threat to the safety of the power system and has a great impact on people's production and life. In order to avoid the impact of lightning on the power system, people have done a lot of research on the phenomenon of lightning, and at the same time formulated the waveform standard of lightning current.

The SAE ARP 5412 lightning environment and related test waveforms formulated by the American Society of Motor Vehicle Engineers (SAE) and the ED (EUROCAE Documents) series of standards ED-84 lightning environment and related test waveforms issued by the European Civil Aviation Equipment Organization specify multiple lightning strikes. Wave (Multiple stroke waveform set) waveform standard. The current experimental components A, B, C, and D in the natural lightning environment, each component simulates the different characteristics of the lightning lightning current, and the D component represents the current component of the re-strike, referring to the provisions of the multiple lightning current return wave standard, the re-strike current pulse wave The peak value is 100kA (relative error ±10%), the action integral on the 1% peak interval (not exceeding 500μs) is 0.25*106A2s (relative error ±20%), the wave front time is not more than 25μs, and the current duration is not more than 500μs , the peak value of the second pulse and n subsequent current pulses is 50kA, and the wave front time and duration are the same as the first pulse. The minimum time interval between two current pulse waves is 10ms, and the maximum time interval is 200ms.

The traditional multiple lightning current impulse current generator mainly includes high-voltage DC charging power supply A; high-voltage DC charging power supply B; capacitor banks C1, C2, ..., C(n-1), Cn; charging resistors R1, R2, ..., R (n-1), Rn, wave modulation impedance Z1, Z2, ..., Z(n-1), Zn; three-electrode high-voltage discharge ball gap G1, G2, ..., G(n-1), Gn; its existence The problem is that the structure of the three-electrode high-voltage discharge ball gaps G1, G2, ..., G(n-1), and Gn is complex. Each pair of discharge ball gaps must have a transmission mechanism for adjusting the ball gap, and a set of ball gap measurement devices is required. , At the same time, there is also a trigger pulse amplifier for the three-electrode discharge ball gap. In addition to these complex mechanisms and devices, there are also a large number of charging resistors R1, R2, . . . , R(n-1), Rn. If the size of the ball gap is not adjusted properly, during the charging process, some discharge ball gaps may malfunction and discharge before being triggered; -1) When Gn is triggered, due to the rise of ground potential and electromagnetic interference caused by the large current pulse discharge circuit, self-discharge or non-discharge faults may occur between the ball gaps, thus making the operation of the impulse current generator unstable , unreliable, leading to test failure.

Contents of the invention

The technical problem to be solved by the present invention is to provide an impulse current generator for simulating multiple lightning strikes, so as to overcome the deficiencies in the prior art, and adopt several insulated gate bipolar transistors to replace the three-electrode high-voltage discharge ball gap, thereby simplifying the structure of the system , no longer need the transmission mechanism for adjusting the ball gap and the device for measuring the size of the ball gap, as well as the pulse amplifier for triggering the three-electrode discharge ball gap to control the insulated gate bipolar transistors G1...G1n and the antiparallel diode D1 in the pulse module that can be stacked vertically …The number of D1n stacks adjusts the charging voltage required for different levels of lightning current; controlling the number of pulse modules that can be stacked horizontally can complete the simulation of one or more lightning strike currents; at the same time, the diodes D2...Dn in the pulse modules that can be stacked horizontally make them parallel to each other The capacitors G2...Gn are always in the conduction state with the high-voltage DC charging power supply S2 during the charging process, and the charging circuit can share the charging resistor R2, saving the charging resistors of each branch, so that the structure of the entire impulse current generator can be simplified.

The technical solution adopted in the present invention is: an impulse current generator for simulating multiple lightning strikes, including a charging module 1, a charging module 2, a vertically stackable pulse module, a blocking module, a horizontally stackable pulse module and a tested load module, The blocking module is composed of insulated gate bipolar transistors V1 and V2. The tested load module is used as a public discharge branch. The circuit topology is divided into the first lightning current generation circuit and the second...n heavy lightning current generation circuit. In the first lightning current generation circuit In the topology, the edge-gate bipolar transistor V1 in the load module under test and the blocking module is connected in series and then connected in parallel with the charging module 1, and the vertically stackable pulse module and the aforementioned circuit (that is, the edge-gate The bipolar transistor V1 is connected in series and then connected in parallel with the charging module 1 to form a complete first lightning current generating circuit; in the second...n heavy lightning current generating circuit topology, the tested load module and the insulating barrier in the blocking module The bipolar transistor V2 is connected in parallel with the charging module 2 after being connected in series, each independent pulse module 2...n in the pulse module that can be stacked horizontally is connected with the aforementioned circuit (that is, the insulated gate bipolar transistor V2 in the tested load module and the blocking module) The circuit formed by the parallel connection of the charging modules 2) is connected in series to form the corresponding second...n heavy lightning current generating circuit.

Specifically, the pulse module that can be stacked vertically is: a high-voltage pulse module formed by stacking a plurality of insulated gate bipolar transistors G1...G1n and anti-parallel diodes D1...D1n vertically and then connecting them in series with a capacitor C1 and a modulation resistor Z1 1 or the pulse module 1 formed by insulated gate bipolar transistor G1 and diode D1 anti-parallel connected in series with capacitor C1 and modulation resistor Z1, where n is the number of stacks selected according to different levels of lightning current parameters, and pulses that can be stacked vertically The module can provide the charging voltage required by lightning currents of different magnitudes.

Specifically, the pulse modules that can be stacked horizontally are: each pulse module 2...n is sequentially connected in parallel according to the direction of horizontal stacking, and a diode D(n-1) is connected in series between the adjacent pulse module n-1 and the pulse module n -n, where n>2; the forward conduction direction of the diode D(n-1)-n is opposite to the direction of the lateral stack, that is, the anode of the diode D(n-1)-n is connected to the negative pole of the capacitor Cn On the one hand, the pulse module n can only discharge the load module under test in the direction of horizontal stacking, but not reversely discharge the pulse module n-1...2; by controlling the number of pulse modules that can be stacked horizontally, one to multiple Simulation of lightning surge current.

Specifically, the charging module 1 is composed of a high-voltage DC charging power supply S1 connected in series with a charging resistor R1 and an insulated gate bipolar transistor V3; the charging module 2 is composed of a high-voltage DC charging power supply S2 connected in series with a charging resistor R2 and an insulated gate bipolar transistor V4. During the charging process, the charging module 1 is connected in series with the pulse modules that can be stacked vertically to form a charging circuit, and the charging module 2 is connected in series with the pulse modules that can be stacked horizontally to form a parallel charging circuit for each pulse module 2...n; during the discharging process, the vertically stackable pulse modules The pulse module is connected in series with the tested load module, and the tested load module is connected in series with each independent pulse module 2...n in the horizontally stackable pulse module, and the conduction time of each independent pulse module 2...n can be adjusted to obtain Complete multiple lightning current waveforms.

Specifically, during charging, the insulated gate bipolar transistors V1 and V2 are disconnected at the same time, so as to isolate the charging module 1 and the charging module 2; When the gate bipolar transistor V1 trigger circuit inputs a high-level signal, the insulated gate bipolar transistor V2 does not input a trigger signal or inputs a low-level signal, so that the pulse module 1 of the first lightning current is simulated and the discharge of several independent pulse modules 2~n thereafter processes are independent of each other.

Specifically, the antiparallel connection of the insulated gate bipolar transistor G1n and the diode D1n in the pulse module that can be stacked vertically or the antiparallel connection of the insulated gate bipolar transistor G2...Gn and the diode D2...Dn in the pulse module that can be stacked horizontally is realized Switching between charging and discharging devices, meanwhile, the diodes D2...Dn in the pulse modules that can be stacked horizontally make the capacitors G2...Gn connected in parallel to each other always in the conduction state with the high-voltage DC charging power supply S2 during the charging process, and the charging circuit can share the charging Resistor R2 saves the charging resistors of each branch, which simplifies the structure of the entire impulse current generator.

Specifically, the load module is a variety of test items that need to be subjected to an impulse discharge test.

The beneficial effects of the present invention are:

1. Use the anti-parallel connection of insulated gate bipolar transistor G1n and diode D1n in the pulse module that can be stacked vertically or the anti-parallel connection of insulated gate bipolar transistor G2...Gn and diode D2...Dn in the pulse module that can be stacked horizontally to realize charging The switch between the discharge devices prevents the charging and discharging circuits from being conducted at the same time, avoiding the phenomenon that in the traditional generator, due to the inappropriate adjustment of the ball gap size, during the charging process, the phenomenon of misoperation and discharge without triggering.

2. A vertically stackable pulse module formed by a plurality of insulated gate bipolar transistors G1...G1n and anti-parallel diodes D1...D1n vertically stacked in series with capacitor C1 and modulation resistor Z1 can be used to adjust different levels of lightning current required Charging voltage.

3. The diodes D2...Dn in the pulse module that can be stacked horizontally make the capacitors G2...Gn connected in parallel with each other always in the conduction state with the high-voltage DC charging power supply S2 during the charging process, and the charging circuit can share the charging resistor R2, saving the need for each branch One circuit charging resistor simplifies the structure of the whole set of impulse current generator.

4. The control of pulse modules that can be stacked horizontally can complete the simulation of one or more lightning impulse currents.

Description of drawings

Figure 1 is a lightning current generation circuit with different amplitudes that are stacked vertically;

Figure 2 is the surge current waveform of triple lightning strike;

Figure 3 is the lightning current generation circuit with different multiplicity realized by horizontal stacking;

Figure 4 is the impulse current waveform of multiple lightning strikes.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1: As shown in Figures 1-4, an impulse current generator for simulating multiple lightning strikes includes a charging module 1, a charging module 2, a pulse module that can be stacked vertically, a blocking module, a pulse module that can be stacked horizontally, and a The load module is tested, and the blocking module is composed of insulated gate bipolar transistors V1 and V2. The tested load module is used as a public discharge branch, and the circuit topology is divided into the first lightning current generation circuit and the second...n heavy lightning current generation circuit. In the topology of the lightning current generation circuit, the edge-gate bipolar transistor V1 in the load module under test and the blocking module is connected in series and then connected in parallel with the charging module 1. The edge-gate bipolar transistor V1 in the series is connected in parallel with the charging module 1 to form a circuit) in series to form a complete first lightning current generating circuit; in the second...n heavy lightning current generating circuit topology, the tested load module and blocking module The insulated gate bipolar transistor V2 in the series is connected in parallel with the charging module 2, and each independent pulse module 2...n in the pulse module that can be stacked horizontally is connected with the aforementioned circuit (that is, the IGBT in the tested load module and the blocking module V2 is connected in series with the charging module 2 in parallel to form a circuit) connected in series to form the corresponding second...n heavy lightning current generating circuit.

Further, the pulse module that can be stacked vertically is: a high-voltage pulse module formed by stacking a plurality of insulated gate bipolar transistors G1...G1n and anti-parallel diodes D1...D1n vertically and then connecting them in series with capacitor C1 and modulation resistor Z1 1 or the pulse module 1 formed by insulated gate bipolar transistor G1 and diode D1 anti-parallel connected in series with capacitor C1 and modulation resistor Z1, where n is the number of stacks selected according to different levels of lightning current parameters, and pulses that can be stacked vertically The module can provide the charging voltage required by lightning currents of different magnitudes.

Further, the pulse modules that can be stacked horizontally are as follows: each pulse module 2...n is sequentially connected in parallel according to the direction of horizontal stacking, and a diode D(n-1) is connected in series between the adjacent pulse module n-1 and the pulse module n -n, where n>2; the forward conduction direction of the diode D(n-1)-n is opposite to the direction of the lateral stack, that is, the anode of the diode D(n-1)-n is connected to the negative pole of the capacitor Cn On the one hand, the pulse module n can only discharge the load module under test in the direction of horizontal stacking, but not reversely discharge the pulse module n-1...2; by controlling the number of pulse modules that can be stacked horizontally, one to multiple Simulation of lightning surge current.

Further, the charging module 1 is composed of a high voltage DC charging power supply S1 connected in series with a charging resistor R1 and an insulated gate bipolar transistor V3; the charging module 2 is composed of a high voltage DC charging power supply S2 connected in series with a charging resistor R2 and an insulated gate bipolar transistor V4. During the charging process, the charging module 1 is connected in series with the pulse modules that can be stacked vertically to form a charging circuit, and the charging module 2 is connected in series with the pulse modules that can be stacked horizontally to form a parallel charging circuit for each pulse module 2...n; during the discharging process, the vertically stackable pulse modules The pulse module is connected in series with the tested load module, and the tested load module is connected in series with each independent pulse module 2...n in the horizontally stackable pulse module, and the conduction time of each independent pulse module 2...n can be adjusted to obtain Complete multiple lightning current waveforms.

Furthermore, according to the multiple lightning impulse current standards, the peak value of the first current pulse wave is twice the peak value of the remaining current pulse waves, and generally requires a higher charging voltage. Therefore, two insulated gate bipolar transistors (V1 , V2) form a charging blocking module. When charging, the insulated gate bipolar transistors V1 and V2 are disconnected at the same time, so as to isolate the charging module 1 and the charging module 2; when discharging, the pulse trigger signals of the insulated gate bipolar transistors V1 and V2 are used to complement each other to form a locking loop, that is, the insulated gate bipolar When the trigger circuit of transistor V1 inputs a high-level signal, the insulated gate bipolar transistor V2 does not input a trigger signal or inputs a low-level signal, so that the discharge process of pulse module 1 simulating the first lightning current and subsequent independent pulse modules 2~n are independent of each other .

Further, the antiparallel connection of the insulated gate bipolar transistor G1n and the diode D1n in the pulse module that can be stacked vertically or the antiparallel connection of the insulated gate bipolar transistor G2...Gn and the diode D2...Dn in the pulse module that can be stacked horizontally is realized Switching between charging and discharging devices, meanwhile, the diodes D2...Dn in the pulse modules that can be stacked horizontally make the capacitors G2...Gn connected in parallel to each other always in the conduction state with the high-voltage DC charging power supply S2 during the charging process, and the charging circuit can share the charging Resistor R2 saves the charging resistors of each branch, which simplifies the structure of the entire impulse current generator.

Further, the load module is various test items that need to be subjected to impulse discharge experiments.

The present invention will be described in detail below in conjunction with specific examples.

Example 1: Using pulse modules that can be stacked vertically to realize a triple lightning current waveform in which the first lightning strike current is the A component. According to the SAE ARP 5412 lightning environment and related test waveform standards formulated by the American Society of Automotive Engineers (SAE), the regulations for the lightning current component A are: the peak time is 6.4 μs, the pulse half width is 69 μs, and the current peak value is 200 kA. As shown in Figure 1: when the capacitors C1, C2, and C3 are charging, the IGBTs V1, V2 in the blocking module are in the off state, which isolates the charging module 1 from the charging module 2, so that the high-voltage DC power supply S1 can be Capacitor C1 provides an independent charging current; at the same time, the charging module 1 and the IGBTs V3 and V4 in the charging module 2 are turned on with positive pulses, and the high-voltage DC charging power supply S1 passes through the charging resistor R1, the IGBT V3, the regulator Wave resistor Z1, insulated gate bipolar transistors G1n...G1 and antiparallel diodes D1n...D1 in vertically stackable modules charge capacitor C1; high voltage DC charging power supply S2 passes through charging resistor R2, insulated gate bipolar transistors V4, wave modulation Resistors Z2, Z3 and diodes D2, D3 complete the parallel charging of capacitors C2, C3.

The discharge circuit of the current generator is an RLC circuit. After the charging is completed, close the insulated gate bipolar transistors V3 and V4 in the charging module 1 and charging module 2; if it is necessary to realize the time interval of the triple lightning current pulse is 50ms (as shown in Figure 2, Δt = 50ms), the IGBTs G1...G1n in the vertically stackable pulse module and the IGBT V1 in the blocking module are turned on after the discharge command is issued with a delay of 0 ms. C1 discharges to the tested loads L and R through insulated gate bipolar transistors G1...G1n, modulation resistor Z1 and insulated gate bipolar transistors V1; insulated gate bipolar transistors G1... G1n and the IGBT V1 in the blocking module are turned off while the IGBT G2 in the horizontally stackable pulse module and the IGBT V2 in the blocking module are turned on, and the capacitor C2 passes through the IGBT Transistor G2, modulation resistor Z2 and IGBT V2 discharge to the tested loads L and R; after a delay of 100 ms, the IGBT G3 in the pulse module that can be stacked horizontally is turned on, and the capacitor C3 passes through the IGBT The pole transistor G3, the wave modulation resistor Z3 and the IGBT V2 discharge to the tested loads L and R; the turn-on time of each pulse module differs by 50ms according to the pulse module number; the turn-off time of the IGBT is shorter than that of the IGBT With a time delay of 50ms, the insulated gate bipolar transistors G1...G1n in the vertically stacked pulse module and the insulated gate bipolar transistor V1 in the blocking module are turned on with a 0ms delay and turned off with a 50ms delay;

The IGBT G2 in the horizontally stackable pulse module and the IGBT V2 in the blocking module are turned on with a delay of 50 ms, and the IGBT G2 is turned off with a delay of 100 ms. The insulated gate bipolar transistor G3 in the horizontally stackable pulse module is turned on with a delay of 100ms and turned off with a delay of 150ms. Since the IGBT V1 in the blocking module is turned off after the discharge of the capacitor C1 is completed, the IGBT V2 does not need to be turned off after a delay of 100 ms until the discharge of the capacitors C2 and C3 is completed. By selecting the appropriate capacitor capacity, loop inductance value, and modulation resistor, the required triple lightning current waveform can be obtained.

Example 2: Using horizontally stackable pulse modules to realize multiple lightning current waveforms in which the first lightning strike current is D component, according to the SAE ARP 5412 lightning environment and related test waveform standards formulated by the American Society of Motor Vehicle Engineers (SAE), the lightning current component D The regulations are: the peak value of the first current pulse wave is 100kA, the wave front time is not more than 25μs, and the current duration is not more than 500μs; The pre-time and duration are the same as the first pulse. As shown in Figure 3, when the capacitors C1...n are charging, the insulated gate bipolar transistors V1 and V2 in the blocking module are in the off state, which isolates the high-voltage DC charging power S1 and S2, so that the high-voltage DC charging power S1 can provide C1 Independent charging current; at the same time, avoid the high-voltage DC power supply from discharging to the load under test when charging the capacitor bank; the insulated gate bipolar transistors V3 and V4 in the charging module 1 and charging module 2 apply positive pulse conduction, and the high-voltage DC charging power supply S1 After the charging resistor R1, the insulated gate bipolar transistor V3, the wave modulation resistor Z1 and the diode D1 charge the capacitor bank C1, the high voltage DC charging power supply S2 passes through the charging resistor R2, the insulated gate bipolar transistor V4 charges the capacitor bank C2, C3, ..., Cn-1 and Cn are charged in parallel. As shown in Figure 3, if lightning current waveforms with different multiplicity are to be obtained, it is controlled by controlling the number n of parallel branches of the transverse pulse module. In this embodiment, n is set to 14 to simulate 14 heavy lightning current waveforms.

After the capacitor bank is charged as shown in Figure 3, a reverse pulse is applied between the collectors and emitters of the insulated gate bipolar transistors V3 and V4 in the charging module 1 and charging module 2, so that the insulated gate bipolar transistors V3 and V4 In cut-off state, disconnect the charging circuit; prepare to discharge to the load under test.

After the control system issues a discharge command, the IGBT G1 in the pulse module 1 and the IGBT V1 in the blocking module apply a positive trigger pulse to turn on. If it is necessary to realize that the time interval between two current pulses is For multiple lightning current waveforms of 50ms (as shown in Figure 4, Δt=50ms), the IGBT G1 in the pulse module 1 and the IGBT V1 in the blocking module are turned on after the discharge command is issued with a delay of 0ms. After 50ms, the IGBT G2 in the pulse module that can be stacked horizontally and the IGBT V2 in the blocking module are turned on, and after a delay of 50*(n-1)ms, the IGBT in the pulse module that can be stacked horizontally The insulated gate bipolar transistor Gn is turned on; the insulated gate bipolar transistors in the pulse module that can be stacked horizontally are sequentially different in turn by 50ms according to the number G2...n; the off time of the insulated gate bipolar transistor is delayed by 50ms than its own on time , that is, the off time is n*50ms. When the IGBT V1 in the blocking module is turned on with a delay of 50ms and turns off, the IGBT V2 in the blocking module is turned on, and then the IGBT V2 in the blocking module can be continuously turned on to the capacitor The group is discharged. As shown in Figure 4, the value of n is 14, then when the control system issues a discharge command, a current pulse is generated every 50ms, a total of 14 pulses, and the total time of 14 multi-pulses does not exceed 0.7 seconds, which meets the lightning current waveform standard .

The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Variations.

Claims (7)

1. A surge current generator for simulating multiple lightning strikes is characterized in that: comprise charging module 1, charging module 2, vertically stackable pulse module, blocking module, horizontally stackable pulse module and tested load module; blocking module It is composed of insulated gate bipolar transistors V1 and V2, and the load module under test is used as a public discharge branch. The circuit topology is divided into the first lightning current generation circuit and the second...n heavy lightning current generation circuit. In the first lightning current generation circuit topology , the tested load module and the edge-gate bipolar transistor V1 in the blocking module are connected in series and then connected in parallel with the charging module 1, and then connected in series with the vertically stackable pulse module to form a complete first lightning current generating circuit; In the topology of the lightning current generation circuit, the load module under test and the IGBT V2 in the blocking module are connected in series and then connected in parallel with the charging module 2, and then connected in series with each independent pulse module 2...n in the pulse module that can be stacked horizontally Constitute the corresponding 2nd...n heavy lightning current generating circuit. 2. The impulse current generator for simulating multiple lightning strikes according to claim 1, characterized in that: the pulse module that can be stacked vertically is composed of a plurality of insulated gate bipolar transistors G1...G1n and anti-parallel diodes D1...D1n is vertically stacked and connected in series with capacitor C1 and modulating resistor Z1 to form a high-voltage pulse module 1 or a pulse module 1 formed by insulated gate bipolar transistor G1 and diode D1 antiparallel connected in series with capacitor C1 and modulating resistor Z1 , where n is the number of stacks selected according to different levels of lightning current parameters, and the pulse modules that can be stacked vertically can provide the charging voltage required by lightning currents of different amplitudes. 3. The impulse current generator for simulating multiple lightning strikes according to claim 2, characterized in that: the pulse modules that can be stacked horizontally are: each pulse module 2...n is connected in parallel in sequence according to the direction of horizontal stacking. The diode D(n-1)-n is connected in series between the adjacent pulse module n-1 and the pulse module n, where n>2; the forward conduction direction of the diode D(n-1)-n is opposite to the direction of the lateral stack, That is, the anode of the diode D(n-1)-n is connected to the negative pole of the capacitor Cn, so that the pulse module n can only discharge the load module under test in the direction of horizontal stacking, but cannot reverse the pulse module n- 1...2 discharge; by controlling the number of pulse modules that can be stacked horizontally, the simulation of one or more lightning impulse currents can be completed. 4. A kind of surge current generator simulating multiple lightning strikes according to claim 3, characterized in that: the charging module 1 is composed of a high-voltage DC charging power supply S1 connected in series with a charging resistor R1 and an insulated gate bipolar transistor V3; Module 2 is composed of a high-voltage DC charging power supply S2 connected in series with a charging resistor R2 and an insulated gate bipolar transistor V4. During the charging process, the charging module 1 is connected in series with a vertically stackable pulse module to form a charging circuit. The charging module 2 and a horizontally stackable pulse module The parallel charging circuit of each pulse module 2...n is formed in series; during the discharge process, the pulse modules that can be stacked vertically are connected in series with the load module under test, and the independent pulse modules 2 in the load module under test and the pulse modules that can be stacked horizontally ...n are connected in series, and the complete multiple lightning current waveform can be obtained by adjusting the conduction time of each independent pulse module 2...n. 5. The impulse current generator for simulating multiple lightning strikes according to claim 4, characterized in that: in the blocking module: when charging, the insulated gate bipolar transistors V1 and V2 are disconnected at the same time, so as to isolate the charging module 1 from the charging Module 2: When discharging, the pulse trigger signals of IGBT V1 and V2 are complementary to form a locking loop, that is, when the IGBT V1 trigger circuit inputs a high-level signal, the IGBT V2 does not input the trigger signal or input The low-level signal makes the pulse module 1 simulating the first lightning current and the discharge process of several independent pulse modules 2-n independent of each other. 6. The impulse current generator for simulating multiple lightning strikes according to claim 5, characterized in that: the anti-parallel connection of insulated gate bipolar transistor G1n and diode D1n in the pulse module that can be stacked vertically or the pulse module that can be stacked horizontally The anti-parallel connection of insulated gate bipolar transistors G2...Gn and diodes D2...Dn in the pulse module realizes switching between charging and discharging devices, while the diodes D2...Dn in the pulse module that can be stacked horizontally make the capacitors G2...Gn connected in parallel During the charging process, it is always in the conduction state with the high-voltage DC charging power supply S2, and the charging circuit can share the charging resistor R2, saving the charging resistors of each branch, so that the structure of the entire impulse current generator can be simplified. 7 . The impulse current generator for simulating multiple lightning strikes according to claim 1 , wherein the load modules are various items to be tested for impulse discharge experiments.

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