Method and device for measuring a discharge current in a nuclear fusion device

Abstract

The present application relates to the technical field of nuclear fusion, and discloses a method and a device for measuring discharge current in a nuclear fusion device, the method being applied to the device for measuring discharge current in the nuclear fusion device, and the device comprising a mutual inductance type current acquisition module and a shunt; the method comprises: obtaining first current data collected by the mutual inductance type current acquisition module between a discharge starting moment of a power supply in the nuclear fusion device and a preset moment; obtaining second current data collected by the shunt between the preset moment and a discharge ending moment of the power supply; and splicing the first current data and the second current data according to the acquisition time sequence to obtain discharge current data; the above embodiment can effectively avoid the appearance of a step signal, more accurately measure an actual current signal, and ensure the current acquisition accuracy in the entire current signal acquisition process.

Description

Technical Field

[0001] This invention relates to the field of nuclear fusion technology, and more specifically to a method and apparatus for measuring discharge current in a nuclear fusion device. Background Technology

[0002] A magnetic confinement fusion device is a device for nuclear fusion research, whose core objective is to achieve controlled nuclear fusion reactions in plasma.

[0003] In magnetic confinement fusion devices such as tokamaks, corresponding drive power supplies are required for various magnetic field coils to ensure the operation of the device. These magnetic field coils may include poloidal field (PF) coils, toroidal field (TF) coils, and central solenoid (CS) coils. The current of the power supply that powers the PF, TF, and CS coils is one of the important parameters for controlling the plasma morphology and stability of the fusion device. By accurately measuring the power supply current, the state of the fusion device can be understood in real time, facilitating the evaluation and analysis of its performance. Furthermore, precise control based on the measurement results ensures that the strength and distribution of the magnetic field meet the design requirements, thereby maintaining the stable plasma morphology.

[0004] In conventional measurement methods, a shunt is usually added to the main circuit loop. The voltage signal on the shunt is collected to obtain the current passing through the shunt, and the actual output current of the power supply is calculated. However, the current measured by the shunt is inaccurate when calculating the actual output current of the power supply, which makes it impossible to accurately control the nuclear fusion device. Summary of the Invention

[0005] In view of this, the present invention provides a method for measuring the discharge current in a nuclear fusion device, in order to solve the problem that the current measured by the shunt is inaccurate when calculating the output current of the actual power supply, which leads to the inability to accurately control the nuclear fusion device.

[0006] In a first aspect, the present invention provides a method for measuring discharge current in a nuclear fusion device, applicable to a device for measuring discharge current in a nuclear fusion device, the measuring device comprising a mutual inductance current acquisition module and a shunt; the measurement method comprising: acquiring first current data acquired by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time; acquiring second current data acquired by the shunt between the preset time and the discharge end time of the power supply; and splicing the first current data and the second current data according to the acquisition sequence to obtain discharge current data.

[0007] As an exemplary embodiment, acquiring first current data collected by the mutual inductance current acquisition module between the discharge start time and a preset time of the power supply in the nuclear fusion device includes: acquiring first discharge period current data continuously collected by the mutual inductance current acquisition module during the discharge period between the discharge start time and the discharge end time; and extracting the current data between the discharge start time and the preset time from the first discharge period current data as the first current data. Acquiring second current data collected by the shunt between the preset time and the discharge end time of the power supply includes: acquiring second discharge period current data continuously collected by the shunt during the discharge period between the discharge start time and the discharge end time; and extracting the current data between the preset time and the discharge end time from the second discharge period current data as the second current data.

[0008] As an exemplary embodiment, acquiring the first current data collected by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time further includes: controlling the mutual inductance current acquisition module to be in an enabled state and controlling the shunt to be in a disabled state between the discharge start time of the power supply in the nuclear fusion device and the preset time, and acquiring the first current data obtained by the mutual inductance current acquisition module from the power supply; acquiring the second current data collected by the shunt between the preset time and the discharge end time of the power supply further includes: controlling the shunt to be in an enabled state and controlling the mutual inductance current acquisition module to be in a disabled state between the preset time and the discharge end time of the power supply, and acquiring the second current data obtained by the shunt from the power supply.

[0009] As an exemplary embodiment, the step of splicing the first current data and the second current data according to the acquisition time sequence to obtain the discharge current data includes: using the first current data as the discharge current data before the preset time, using the second current data as the discharge current data after the preset time, and splicing the first current data and the second current data with the preset time as the time node to obtain the discharge current data.

[0010] As an exemplary embodiment, before the discharge start-up time of the power supply in the nuclear fusion device, the measurement method further includes: determining whether the estimated step signal value generated by the power supply in the current discharge event is greater than a preset step signal value; when the estimated step signal value is greater than the preset step signal value, acquiring first current data collected by the mutual inductance current acquisition module between the discharge start-up time and the preset time of the power supply in the nuclear fusion device; acquiring second current data collected by the shunt between the preset time and the discharge end time of the power supply; splicing the first current data and the second current data according to the acquisition sequence to obtain discharge current data; when the estimated step signal value is less than the preset step signal value, acquiring the current data collected by the shunt as the discharge current data during the discharge period between the start-up time and the end time.

[0011] As an exemplary embodiment, determining whether the step signal value generated by the power supply in the current discharge event is greater than a preset step signal value includes: obtaining the component parameters of the shunt and the set discharge parameters of the power supply in the current discharge event; determining the estimated step signal value of the current discharge event based on the component parameters and the set discharge parameters; and comparing the estimated step signal value with the preset step signal value to obtain a comparison result.

[0012] Secondly, the present invention provides a device for measuring discharge current in a nuclear fusion device, comprising a mutual inductance current acquisition module, a shunt, and a control module; wherein the shunt is connected in series in the loop of the circuit under test, and the mutual inductance current acquisition module is disposed at a preset position in the loop of the circuit under test; the control module is connected to the mutual inductance current acquisition module and the shunt respectively; the control module acquires first current data acquired by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time; the control module acquires second current data acquired by the shunt between the preset time and the discharge end time of the power supply; the control module splices the first current data and the second current data according to the acquisition sequence to obtain discharge current data.

[0013] As an exemplary embodiment, the control module is further configured to control the mutual inductance current acquisition module and the shunt to simultaneously acquire current during the discharge period from the discharge start time to the discharge end time, and respectively acquire the first discharge period current data acquired by the mutual inductance current acquisition module and the second discharge period current data acquired by the shunt; extract the current data between the discharge start time and the preset time from the first discharge period current data as the first current data; and extract the current data between the preset time and the discharge end time from the second discharge period current data as the second current data.

[0014] As an exemplary embodiment, the control module is further configured to, between the discharge start time of the power supply in the nuclear fusion device and a preset time, control the mutual inductance current acquisition module to be in an enabled state and control the shunt to be in a disabled state, and acquire the first current data obtained by the mutual inductance current acquisition module from the power supply; and between the preset time and the discharge end time of the power supply, control the shunt to be in an enabled state and control the mutual inductance current acquisition module to be in a disabled state, and acquire the second current data obtained by the shunt from the power supply.

[0015] As an exemplary embodiment, the system further includes: a first control switch connected in parallel with the shunt, the control terminal of the first control switch being connected to the control module; when closed under the trigger of a first switch control signal output by the control module, the first control switch short-circuits the shunt, disabling it; and when opened under the trigger of the first switch control signal output by the control module, the first control switch enables the shunt. A second control switch is connected in series between the output terminal of the mutual inductance current acquisition module and the control module, the control terminal of the second control switch being connected to the control module; when closed under the trigger of a second switch signal output by the control module, the second control switch connects the mutual inductance current acquisition module and the control module, enabling the mutual inductance current acquisition module; and when opened under the trigger of the second switch signal output by the control module, the second control switch disconnects the mutual inductance current acquisition module and the control module, disabling it.

[0016] The present invention discloses a method for measuring discharge current in a nuclear fusion device. This method is applied to a device for measuring discharge current in a nuclear fusion device, the device comprising a mutual inductance current acquisition module and a shunt. The measurement method includes: acquiring first current data acquired by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time; acquiring second current data acquired by the shunt between the preset time and the discharge end time of the power supply; and concatenating the first current data and the second current data according to the acquisition sequence to obtain discharge current data. Through the above implementation, acquiring the first current data acquired by the mutual inductance current acquisition module between the discharge start time of the power supply and the preset time effectively avoids the occurrence of step signals, more accurately measures the actual current signal, ensures the accuracy of current acquisition throughout the entire current signal acquisition process, and enables control of the nuclear fusion device based on more accurate current acquisition results. This solves the technical problem that the current measured by the shunt is inaccurate when calculating the output current of the actual power supply, resulting in the inability to accurately control the nuclear fusion device. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the current in the shunt during the experimental test;

[0019] Figure 2 This is the equivalent model diagram of the splitter;

[0020] Figure 3 This is a schematic diagram of the frequency impedance curve of a non-ideal resistor in related technologies;

[0021] Figure 4 This is an equivalent simulation result diagram of the power supply discharge current collected using a shunt.

[0022] Figure 5 This is a flowchart of a method for measuring discharge current in a nuclear fusion device according to an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In related technologies, a shunt is usually added to the main circuit loop, and the actual output current of the power supply is calculated by acquiring the voltage signal on the shunt and thus obtaining the current passing through the shunt.

[0025] However, during experimental testing using a shunt, the inventors discovered a step signal superimposed on the signal passing through the shunt; specifically, Figure 1 This is a schematic diagram of the current during the experimental testing of the shunt, as shown below. Figure 1 As shown, near time T1, the current signal suddenly shows a step-like signal when the signal changes. According to the design of the power supply circuit that supplies power to the coil, the signal shown in the figure should not appear near time T1.

[0026] To verify whether the signal near time T1 truly exists, the inventors measured the current of the power supply during power supply using a more precise measurement method: an optical fiber current sensor. The measurement revealed that… Figure 1 The step signal exhibited by the shunt shown near time T1 is indeed absent. In order to find the cause of the step signal, after a lot of research, it was found that the magnitude of the step signal is related to di / dt during discharge. The larger di / dt is, the larger the step signal is.

[0027] In view of this phenomenon, the inventors discovered that the step signal was caused by the presence of inductance in the shunt measurement circuit. Figure 2 This is the equivalent model diagram of the shunt, and its impedance can be expressed by the time-domain formula as shown in equation (1):

[0028] (1)

[0029] In equation (1), Z(s) represents the impedance in the time domain formula, L represents the equivalent inductance of the shunt, R represents the equivalent resistance of the shunt, C represents the equivalent capacitance of the shunt, and s represents the complex frequency, which is specifically a function of time t.

[0030] Furthermore, by converting the time-domain formula to a frequency-domain formula using s=jω, and substituting it into the above equation, we can obtain the frequency-domain formula for the impedance as shown in equation (2):

[0031] (2)

[0032] In equation (2), Z(jω) represents the impedance in the time domain formula, j represents the complex unit, and ω represents the frequency.

[0033] Figure 3 This is a schematic diagram of the frequency impedance curve of a non-ideal resistor in related technologies, such as... Figure 3 As shown, under the premise of R=10Ω, C=0.2pF, and L=10nH, the impedance of the non-ideal resistor increases exponentially with increasing frequency.

[0034] Therefore, at the moment of power supply discharge, the equivalent frequency is very high, and the shunt cannot be analyzed using pure resistance. Parasitic parameters need to be taken into account, especially parasitic inductance. di / dt will induce a large voltage on it, which is much larger than the voltage across the resistor.

[0035] Based on the above principles, the inventors conducted an equivalent simulation of the entire testing process; Figure 4 This is an equivalent simulation result diagram of the power supply discharge current collected using a shunt. See [link / reference]. Figure 4 :exist Figure 4 In the diagram, AM1 is the actual current signal, VM1 is the equivalent waveform of the parasitic capacitance of the shunt, VM2 is the equivalent waveform of the resistance of the shunt, and VM3 is the equivalent waveform of the parasitic inductance of the shunt. Figure 4 It is known that near time T1, when the power supply is discharging, a step signal will inevitably appear when the shunt is used for measurement, given that the equivalent frequency is very high. Calculating the actual output current of the power supply based on the current value through the shunt near time T1 results in inaccurate measurement results, which leads to the inability to accurately control the nuclear fusion device.

[0036] Based on this, according to an embodiment of the present invention, a method for measuring discharge current in a nuclear fusion device is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0037] This embodiment provides a method for measuring discharge current in a nuclear fusion device, which is applied to a device for measuring discharge current in a nuclear fusion device. The measuring device includes a mutual inductance current acquisition module and a shunt. Figure 5 This is a flowchart of a method for measuring discharge current in a nuclear fusion device according to an embodiment of the present invention, such as... Figure 5 As shown, the process includes the following steps:

[0038] Step S101: Between the discharge start time of the power supply in the nuclear fusion device and the preset time, acquire the first current data collected by the mutual inductance current acquisition module.

[0039] As mentioned above, when the current of the power supply is collected by the shunt, a step signal will be generated at time T1. Using this step signal to calculate the actual output current of the power supply will result in inaccurate measurement results. To avoid this problem, the first current data collected by the mutual inductance current acquisition module is obtained between the discharge start time of the power supply in the nuclear fusion device and the preset time. The preset time is greater than or equal to time T1.

[0040] For example, the mutual inductance current acquisition module may include a Roco coil and a Hall sensor; in this invention, the technical solution of the present invention is described using a Roco coil as an example of a mutual inductance current acquisition module; specifically, the Roco coil needs to be used in conjunction with an integrator, so a combination of a Roco coil and an integrator is used to measure the current of the power supply in the nuclear fusion device from the discharge start time to a preset time to obtain the first current data.

[0041] Furthermore, since the integrator of the Roco coil has the disadvantages of drift and saturation, and the Roco coil is greatly affected by the spatial magnetic field, it is only suitable for short-term measurement and not for long-term measurement. Based on this, in this invention, the preset time is less than the earlier of the drift time and saturation time of the integrator of the Roco coil. The drift time and saturation time can be predetermined by the component parameters of the integrator after the Roco coil and the integrator are determined.

[0042] Step S102: Between the preset time and the end time of the power supply discharge, acquire the second current data collected by the shunt.

[0043] As mentioned above, the integrator of the Roco coil suffers from drift and saturation, making it unsuitable for long-term measurements. Therefore, by using the shunt to collect the second current data of the power supply between the preset time and the end of the power supply's discharge, not only can the occurrence of step signals be effectively avoided, but the actual current signal can also be measured more accurately, ensuring the accuracy of current acquisition throughout the entire current signal acquisition process. This allows for more precise control of the nuclear fusion device based on the current acquisition results.

[0044] Step S103: The first current data and the second current data are spliced ​​together according to the acquisition time sequence to obtain the discharge current data.

[0045] In this embodiment, discharge current data is obtained by splicing the first current data and the second current data according to the acquisition time sequence. The first current data is the current data collected by the mutual inductance current acquisition module between the discharge start time of the power supply and the preset time, which can avoid the occurrence of step signals. The second current data is the data collected by the shunt between the preset time and the discharge end time of the power supply, which can avoid the drift and saturation disadvantages of the mutual inductance current acquisition module and the disadvantage of being greatly affected by the spatial magnetic field interference.

[0046] As one possible implementation, the current acquisition module and the shunt can be controlled simultaneously to continuously acquire current between the discharge start time and the discharge end time of the power supply, obtaining the current data during the first discharge period of the current acquisition module and the current data during the second discharge period of the shunt. Further, the current data between the discharge start time and the preset time is extracted from the current data during the first discharge period as the first current data, and the current data between the preset time and the discharge end time is extracted from the current data during the second discharge period as the second current data. Then, the first current data and the second current data are spliced ​​according to the acquisition time sequence to obtain the discharge current data.

[0047] As another possible implementation, current can be collected separately through a mutual inductance current acquisition module between the discharge start time of the power supply and a preset time, and the obtained current acquisition signal is used as the first current data; between the preset time and the discharge end time of the power supply, current can be collected separately through a shunt, and the obtained current acquisition signal is used as the second current data, and then the first current data and the second current data are fused to obtain the discharge current.

[0048] The present invention discloses a method for measuring discharge current in a nuclear fusion device. This method is applied to a device for measuring discharge current in a nuclear fusion device, the device comprising a mutual inductance current acquisition module and a shunt. The measurement method includes: acquiring first current data acquired by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time; acquiring second current data acquired by the shunt between the preset time and the discharge end time of the power supply; and concatenating the first current data and the second current data according to the acquisition sequence to obtain discharge current data. Through the above implementation, acquiring the first current data acquired by the mutual inductance current acquisition module between the discharge start time of the power supply and the preset time effectively avoids the occurrence of step signals, more accurately measures the actual current signal, ensures the accuracy of current acquisition throughout the entire current signal acquisition process, and enables control of the nuclear fusion device based on more accurate current acquisition results. This solves the technical problem that the current measured by the shunt is inaccurate when calculating the output current of the actual power supply, resulting in the inability to accurately control the nuclear fusion device.

[0049] In one embodiment, acquiring first current data collected by the mutual inductance current acquisition module between the discharge start time and a preset time of the power supply in the nuclear fusion device includes: acquiring first discharge period current data continuously collected by the mutual inductance current acquisition module during the discharge period between the discharge start time and the discharge end time; and extracting the current data between the discharge start time and the preset time from the first discharge period current data as the first current data. Acquiring second current data collected by the shunt between the preset time and the discharge end time of the power supply includes: acquiring second discharge period current data continuously collected by the shunt during the discharge period between the discharge start time and the discharge end time; and extracting the current data between the preset time and the discharge end time from the second discharge period current data as the second current data.

[0050] In this embodiment, the mutual inductance current acquisition module and the shunt continuously acquire current data simultaneously from the discharge start time to the discharge end time, obtaining current data during the first discharge period and current data during the second discharge period, respectively. Furthermore, current data between the discharge start time and the preset time is extracted from the first discharge period current data as the first current data, and current data between the preset time and the discharge end time is extracted from the second discharge period current data as the second current data. This effectively avoids the occurrence of step signals, more accurately measures the actual current signal, ensures the accuracy of current acquisition throughout the entire current signal acquisition process, and enables control of the nuclear fusion device based on more accurate current acquisition results.

[0051] In this embodiment, the preset time can be determined in advance by the component parameters of the integrator after selecting the Roco coil and the integrator, or it can be dynamically determined based on real-time analysis of the current data collected during the acquisition process to ensure that the signal collected throughout the process is more accurate. Specifically, since the shunt will produce a step signal at the discharge start time of the power supply, and the subsequent acquired signal is relatively accurate, while the current signal collected by the Roco coil and the integrator tends to be inaccurate as time increases, the current data during the first discharge period and the current data during the second discharge period can be compared in real time after the discharge start time. When the two current data deviate, the time when the deviation occurs is taken as the aforementioned preset time. That is, if the current data collected by the Roco coil fluctuates or deviates compared with the current data collected by the shunt after the discharge start time, it can be considered that the Roco coil has drifted or saturated. After this, the current collected by the Roco coil will be inaccurate. Therefore, this time is taken as the preset time. The current data collected by the shunt after the preset time is taken as the second current data and spliced ​​with the first current data collected by the Roco coil before the preset time to finally obtain the complete discharge current data of the power supply in the entire discharge event.

[0052] In one embodiment, acquiring the first current data collected by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time further includes: controlling the mutual inductance current acquisition module to be in an enabled state and controlling the shunt to be in a disabled state between the discharge start time of the power supply in the nuclear fusion device and the preset time, and acquiring the first current data obtained by the mutual inductance current acquisition module from the power supply; acquiring the second current data collected by the shunt between the preset time and the discharge end time of the power supply further includes: controlling the shunt to be in an enabled state and controlling the mutual inductance current acquisition module to be in a disabled state between the preset time and the discharge end time of the power supply, and acquiring the second current data obtained by the shunt from the power supply.

[0053] As one possible implementation, a first control switch is connected in parallel to the shunt, and a second control switch is connected in series to the output of the mutual inductance current acquisition module. The operating state of the mutual inductance current acquisition module or the shunt can be changed by controlling the states of the first and second control switches.

[0054] For example, between the discharge start time of the power supply in the nuclear fusion device and a preset time, the first control switch can be closed to short-circuit the shunt, causing the shunt to be disabled. At the same time, the second control switch can be closed to enable the mutual inductance current acquisition module, thereby obtaining the first current data obtained by the mutual inductance current acquisition module from the power supply.

[0055] For example, the power supply in the nuclear fusion device can control the first control switch to open between the preset time and the end time of the power supply's discharge, enabling the shunt, and simultaneously control the second control switch to open, so that the mutual inductance current acquisition module is disconnected from the power supply, thereby obtaining the second current data obtained by the shunt acquiring the current from the power supply.

[0056] For example, when the first control switch is closed under the trigger of the first switch control signal, it short-circuits the shunt, disabling the shunt; when it is opened under the trigger of the first switch control signal, it disconnects the shunt and the control module, disabling the shunt. The first switch control signal can be a level signal with different level states; the first control switch closes under the trigger of the first switch control signal at the first level state and opens under the trigger of the first switch control signal at the second level state.

[0057] For example, a second control switch is connected in series in the branch where the output terminal of the mutual inductance current acquisition module is located; when the second control switch is closed under the trigger of the second switch signal, the branch where the output terminal of the mutual inductance current acquisition module is located is connected, enabling the mutual inductance current acquisition module; when the second control switch is opened under the trigger of the second switch signal, the branch where the output terminal of the mutual inductance current acquisition module is located is disconnected, disabling the mutual inductance current acquisition module; wherein, the second switch signal can be a level signal with different level states, the second control switch is closed under the trigger of the second switch control signal in the first level state, and is opened under the trigger of the second switch control signal in the second level state.

[0058] In one embodiment, the step of concatenating the first current data and the second current data according to the acquisition time sequence to obtain discharge current data includes: using the first current data as discharge current data before the preset time, using the second current data as discharge current data after the preset time, and concatenating the first current data and the second current data with the preset time as the time node to obtain the discharge current data.

[0059] In one embodiment, before the discharge start-up time of the power supply in the nuclear fusion device, the measurement method further includes: determining whether the estimated step signal value generated by the power supply in the current discharge event is greater than a preset step signal value; when the estimated step signal value is greater than the preset step signal value, acquiring first current data collected by the mutual inductance current acquisition module between the discharge start-up time and the preset time of the power supply in the nuclear fusion device; acquiring second current data collected by the shunt between the preset time and the discharge end time of the power supply; splicing the first current data and the second current data according to the acquisition sequence to obtain discharge current data; when the estimated step signal value is less than the preset step signal value, acquiring the current data collected by the shunt as the discharge current data during the discharge period between the start-up time and the end time.

[0060] As mentioned above, near time T1 when the power supply discharges, a step signal will inevitably appear when using a shunt to measure, given a high equivalent frequency. Calculating the actual output current of the power supply based on the current value through the shunt near time T1 results in inaccurate measurement results. However, the inventors discovered that the step signal is not obvious and does not affect the observation when the measured current and the parasitic inductance of the shunt are small. In this case, the mutual inductance current acquisition module suffers from drift and saturation. Therefore, without affecting the observation, using only a shunt for current acquisition can effectively avoid the drift and saturation drawbacks of the mutual inductance current acquisition module.

[0061] Based on this, in this embodiment, before the discharge start-up time of the power supply in the nuclear fusion device, the measurement method further includes: determining whether the estimated step signal value generated by the power supply in the current discharge event is greater than a preset step signal value; since the power supply parameters of the power supply in the nuclear fusion device are preset discharge parameters, the estimated step signal value generated by the power supply in the current discharge event can be calculated using these preset discharge parameters; furthermore, since the component parameters of the shunt are also preset after the shunt is installed in the nuclear fusion device, the step signal value corresponding to the preset discharge event that just affects the observation when the current is measured using the shunt can be obtained based on these preset component parameters as the preset step signal value; when the estimated step signal value is greater than the preset step signal value... The step signal that appears when using a shunt for current detection affects the observation. Calculating the actual output current of the power supply using the shunt's current value results in inaccurate measurements. Therefore, between the discharge start-up time and a preset time of the power supply within the nuclear fusion device, the first current data collected by the mutual inductance current acquisition module is acquired; between the preset time and the discharge end time of the power supply, the second current data collected by the shunt is acquired; the first and second current data are then concatenated according to the acquisition sequence to obtain the discharge current data. When the estimated step signal value is less than the preset step signal value, the step signal does not affect the observation when using a shunt for current detection. Therefore, during the discharge period between the start-up time and the end time, the current data collected by the shunt is acquired as the discharge current data.

[0062] In this embodiment, the nuclear fusion device has multiple power supplies, each with a different discharge current. Furthermore, even for the same power supply, the discharge parameters vary depending on the specific requirements. For example, the power supply for the magnet has a large discharge current and requires high accuracy in current measurement. Therefore, the step signal is not only significant but also has a substantial impact. Consequently, a mutual inductance current acquisition module and a shunt are needed to acquire the current. On the other hand, some power supplies have smaller discharge currents. For devices with lower current measurement accuracy requirements, the step signal is less noticeable and has a smaller impact due to the smaller current. Therefore, to simplify current measurement, a shunt can be used directly for current acquisition.

[0063] Therefore, to determine whether the step signal value generated by the power supply in the current discharge event is greater than the preset step signal value, it can be determined whether it is necessary to use a mutual inductance current acquisition module and a shunt to collect the current based on the type of the current discharge event.

[0064] Furthermore, for discharge events requiring the use of a mutual inductance current acquisition module and a shunt to collect current, the impact of the step signal generated in the current discharge event on subsequent current measurement results can be determined by setting discharge parameters and shunt component parameters. In this embodiment, the shunt component parameters and the set discharge parameters of the power supply for the current discharge event can be obtained; based on the component parameters and the set discharge parameters, the estimated step signal value of the current discharge event is determined. The estimated step signal value is then compared with a preset step signal value to determine whether the step signal value generated by the power supply in the current discharge event is greater than the preset step signal value.

[0065] Secondly, the present invention provides a device for measuring discharge current in a nuclear fusion device, comprising a mutual inductance current acquisition module, a shunt, and a control module; wherein the shunt is connected in series in the loop of the circuit under test, and the mutual inductance current acquisition module is disposed at a preset position in the loop of the circuit under test; the control module is connected to the mutual inductance current acquisition module and the shunt respectively; the control module acquires first current data acquired by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time; the control module acquires second current data acquired by the shunt between the preset time and the discharge end time of the power supply; the control module splices the first current data and the second current data according to the acquisition sequence to obtain discharge current data.

[0066] As mentioned above, when the current of the power supply is collected by the shunt, a step signal will be generated at time T1. Using this step signal to calculate the actual output current of the power supply will result in inaccurate measurement results. To avoid this problem, the control module acquires the first current data collected by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time. The preset time is greater than or equal to time T1.

[0067] For example, the mutual inductance current acquisition module may include at least one of a Roco coil and an optical fiber current sensor; in this invention, the technical solution of the present invention is described using a Roco coil as an example of a mutual inductance current acquisition module; specifically, the Roco coil needs to be used in conjunction with an integrator, so a combination of a shunt and a Roco coil plus an integrator is used to measure the current of the power supply in the nuclear fusion device from the discharge start time to a preset time to obtain the first current data.

[0068] Furthermore, since the integrator of the Roco coil has the disadvantages of drift and saturation, and the Roco coil is greatly affected by spatial magnetic field interference, it is only suitable for short-term measurement and not for long-term measurement. Based on this, in this invention, the preset time is less than the earlier of the drift time and saturation time of the Roco coil integrator. The drift time and saturation time can be predetermined by the operating parameters of the integrator after the Roco coil and the integrator are determined.

[0069] The above-described implementation can effectively avoid the occurrence of step signals, more accurately measure the actual current signal, ensure the accuracy of current acquisition throughout the entire current signal acquisition process, and enable control of the nuclear fusion device based on more accurate current acquisition results.

[0070] In this embodiment, the control module splices the first current data and the second current data according to the acquisition sequence to obtain discharge current data. The first current data is the first current data acquired by the control module from the discharge start time of the power supply in the nuclear fusion device to a preset time, which avoids the occurrence of step signals. The second current data is the data acquired by the shunt between the preset time and the discharge end time of the power supply, which avoids the drift and saturation disadvantages of the mutual inductance current acquisition module and the disadvantage of being greatly affected by space magnetic field interference.

[0071] As one possible implementation, the current acquisition module and the shunt can be controlled simultaneously by the control module to continuously acquire current data between the discharge start time and the discharge end time of the power supply. The first current data of the current acquisition module and the second current data of the shunt are obtained respectively. Furthermore, the control module extracts the current data between the discharge start time and the preset time from the current data during the first discharge period as the first current data, and extracts the current data between the preset time and the discharge end time from the current data during the second discharge period as the second current data. Then, the first current data and the second current data are spliced ​​according to the acquisition time sequence to obtain the discharge current data.

[0072] As another possible implementation, the current acquisition module can be controlled separately by the control module to acquire the current between the discharge start time of the power supply and the preset time, and the acquired current signal is used as the first current data; between the preset time and the discharge end time of the power supply, the current acquisition module can be controlled separately by the control module to acquire the current, and the acquired current signal is used as the second current data, and then the first current data and the second current data are fused to obtain the discharge current.

[0073] The discharge current measuring device in the nuclear fusion device of the present invention, between the discharge start time of the power supply and a preset time, the control module acquires the first current data collected by the mutual inductance current acquisition module within the nuclear fusion device during the discharge start time of the power supply. This effectively avoids the occurrence of step signals, more accurately measures the actual current signal, ensures the accuracy of current acquisition throughout the entire current signal acquisition process, and enables control of the nuclear fusion device based on more accurate current acquisition results. It solves the technical problem that the current measured by the shunt is inaccurate when calculating the actual power supply output current, which leads to the inability to accurately control the nuclear fusion device.

[0074] As an exemplary embodiment, the control module is further configured to control the mutual inductance current acquisition module and the shunt to simultaneously acquire current during the discharge period from the discharge start time to the discharge end time, and respectively acquire the first discharge period current data acquired by the mutual inductance current acquisition module and the second discharge period current data acquired by the shunt; extract the current data between the discharge start time and the preset time from the first discharge period current data as the first current data; and extract the current data between the preset time and the discharge end time from the second discharge period current data as the second current data.

[0075] In this embodiment, the control module controls the mutual inductance current acquisition module and the shunt to simultaneously acquire current during the discharge period from the discharge start time to the discharge end time, and respectively acquires the first discharge period current data acquired by the mutual inductance current acquisition module and the second discharge period current data acquired by the shunt. Furthermore, the current data between the discharge start time and the preset time is extracted from the first discharge period current data as the first current data, and the current data between the preset time and the discharge end time is extracted from the second discharge period current data as the second current data. This effectively avoids the occurrence of step signals, more accurately measures the actual current signal, ensures the accuracy of current acquisition throughout the entire current signal acquisition process, and enables control of the nuclear fusion device based on more accurate current acquisition results.

[0076] As an exemplary embodiment, the control module is further configured to, between the discharge start time of the power supply in the nuclear fusion device and a preset time, control the mutual inductance current acquisition module to be in an enabled state and control the shunt to be in a disabled state, and acquire the first current data obtained by the mutual inductance current acquisition module from the power supply; and between the preset time and the discharge end time of the power supply, control the shunt to be in an enabled state and control the mutual inductance current acquisition module to be in a disabled state, and acquire the second current data obtained by the shunt from the power supply.

[0077] In this embodiment, the control module is also used to control the mutual inductance current acquisition module to be in an enabled state and the shunt to be in a disabled state between the discharge start time of the power supply in the nuclear fusion device and a preset time. This allows the mutual inductance current acquisition module to acquire the first current data obtained by acquiring the current of the power supply, effectively avoiding the occurrence of step signals, measuring the actual current signal more accurately, ensuring the accuracy of current acquisition throughout the entire current signal acquisition process, and enabling control of the nuclear fusion device based on more accurate current acquisition results.

[0078] As an exemplary embodiment, it further includes: a first control switch connected in parallel with the shunt, the control terminal of the first control switch being connected to the control module, which short-circuits the shunt when closed under the trigger of the first switch control signal output by the control module, thereby disabling the shunt, and enables the shunt when opened under the trigger of the first switch control signal output by the control module.

[0079] A second control switch is connected in series between the output terminal of the mutual inductance current acquisition module and the control module. The control terminal of the second control switch is connected to the control module. When the second control switch is closed under the trigger of the second switch signal output by the control module, the mutual inductance current acquisition module and the control module are connected, enabling the mutual inductance current acquisition module. When the second switch signal output by the control module is opened, the mutual inductance current acquisition module and the control module are disconnected, disabling the mutual inductance current acquisition module.

[0080] For example, when the first control switch is closed under the trigger of the first switch control signal, it short-circuits the shunt, disabling the shunt; when it is opened under the trigger of the first switch control signal, it disconnects the shunt and the control module, disabling the shunt. The first switch control signal can be a level signal with different level states; when the first control switch is closed under the trigger of the first switch control signal at the first level state, it is opened under the trigger of the first switch control signal at the second level state.

[0081] For example, a second control switch is connected in series between the output terminal of the mutual inductance current acquisition module and the control module. When closed under the trigger of the second switch signal output by the control module, the mutual inductance current acquisition module and the control module are connected, enabling the mutual inductance current acquisition module; when opened under the trigger of the second switch signal output by the control module, the mutual inductance current acquisition module and the control module are disconnected, disabling the mutual inductance current acquisition module. The second switch signal can be a level signal with different level states; the second control switch closes under the trigger of the second switch control signal at the first level state and opens under the trigger of the second switch control signal at the second level state.

[0082] For example, the control module can control the first control switch to close between the discharge start time and a preset time of the power supply in the nuclear fusion device, which is connected to the control terminals of the first and second control switches, to short-circuit the shunt and disable it. At the same time, it controls the second control switch to close to enable the mutual inductance current acquisition module, thereby acquiring the first current data obtained by the mutual inductance current acquisition module from the power supply.

[0083] For example, the control module can control the first control switch to open between the preset time and the discharge end time of the power supply in the nuclear fusion device, which is connected to the control terminals of the first and second control switches, so that the shunt can be enabled. At the same time, it can control the second control switch to open, so that the mutual inductance current acquisition module is disconnected from the power supply, thereby obtaining the second current data obtained by the shunt acquiring the current of the power supply.

[0084] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0085] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or the indirect coupling or communication connection of units or modules may be electrical or other forms.

[0086] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the solution provided in this embodiment, depending on actual needs.

[0087] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0088] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0089] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for measuring discharge current in a nuclear fusion device, characterized in that, A measuring device for discharge current in a nuclear fusion device, comprising a mutual inductance current acquisition module and a shunt; the shunt is connected in series in the circuit under test, and the mutual inductance current acquisition module is positioned at a predetermined location in the circuit under test; the measurement method includes: Between the discharge start time of the power supply in the nuclear fusion device and a preset time, the mutual inductance current acquisition module is controlled to be in an enabled state, and the shunt is controlled to be in a disabled state. The first current data collected by the mutual inductance current acquisition module is acquired. The preset time is greater than or equal to the time when the power supply generates a step signal during discharge. The step signal is generated at the moment when the power supply discharges when the current is collected by the shunt. The power supply provides power to the magnet coil in the nuclear fusion device. The preset time includes the time after the discharge start time. The current data during the first discharge period and the current data during the second discharge period are compared in real time. When the two current data deviate, the time when the deviates is taken as the preset time. Between the preset time and the end time of the power supply discharge, the shunt is controlled to be in an enabled state, and the mutual inductance current acquisition module is controlled to be in a disabled state, so as to acquire the second current data collected by the shunt. The first current data and the second current data are concatenated according to the acquisition time sequence to obtain the discharge current data.

2. The method for measuring discharge current in a nuclear fusion device as described in claim 1, characterized in that, Between the discharge start-up time of the power supply in the nuclear fusion device and a preset time, the first current data collected by the mutual inductance current acquisition module is obtained, including: Acquire the current data continuously collected by the mutual inductance current acquisition module during the first discharge period between the discharge start time and the discharge end time. The current data between the discharge start time and the preset time is extracted from the current data during the first discharge period and used as the first current data. The step of acquiring the second current data collected by the shunt between the preset time and the end time of the power supply discharge includes: Acquire the second discharge period current data continuously collected by the shunt during the discharge period between the discharge start time and the discharge end time; The current data between the preset time and the end time of the discharge is extracted from the current data during the second discharge period and used as the second current data.

3. The method for measuring discharge current in a nuclear fusion device as described in claim 1, characterized in that, The method of acquiring the first current data collected by the mutual inductance current acquisition module between the discharge start-up time of the power supply in the nuclear fusion device and a preset time further includes: Between the discharge start time of the power supply in the nuclear fusion device and a preset time, the mutual inductance current acquisition module is controlled to be in an enabled state, and the shunt is controlled to be in a disabled state, so as to obtain the first current data by the mutual inductance current acquisition module acquiring the current of the power supply. The step of acquiring the second current data collected by the shunt between the preset time and the end time of the power supply discharge further includes: Between the preset time and the end time of the power supply discharge, the shunt is controlled to be in an enabled state, and the mutual inductance current acquisition module is controlled to be in a disabled state, so as to obtain the second current data by the shunt acquiring the current of the power supply.

4. The method for measuring discharge current in a nuclear fusion device as described in any one of claims 1 to 3, characterized in that, The step of concatenating the first current data and the second current data according to the acquisition time sequence to obtain the discharge current data includes: The first current data is used as the discharge current data before the preset time, and the second current data is used as the discharge current data after the preset time. The first current data and the second current data are spliced ​​together with the preset time as the time node to obtain the discharge current data.

5. The method for measuring discharge current in a nuclear fusion device as described in any one of claims 1 to 3, characterized in that, The measurement method further includes the following steps prior to the discharge start-up moment of the power supply within the nuclear fusion device: Determine whether the estimated step signal value generated by the power supply in the current discharge event is greater than the preset step signal value; When the estimated step signal value is greater than the preset step signal value, the first current data collected by the mutual inductance current acquisition module is acquired between the discharge start time of the power supply in the nuclear fusion device and the preset time; the second current data collected by the shunt is acquired between the preset time and the discharge end time of the power supply; the first current data and the second current data are spliced ​​together according to the acquisition time sequence to obtain the discharge current data. When the estimated step signal value is less than the preset step signal value, the current data collected by the shunt is acquired as the discharge current data during the discharge period between the start time and the end time.

6. The method for measuring discharge current in a nuclear fusion device as described in claim 5, characterized in that, The step of determining whether the step signal value generated by the power supply in the current discharge event is greater than a preset step signal value includes: Obtain the component parameters of the shunt and the set discharge parameters of the power supply in the current discharge event; The estimated step signal value of the current discharge event is determined based on the component parameters and the set discharge parameters. The predicted step signal value and the preset step signal value are compared to obtain the comparison result.

7. A device for measuring discharge current in a nuclear fusion device, characterized in that, It includes a mutual inductance current acquisition module, a shunt, and a control module; wherein the shunt is connected in series in the loop of the circuit under test, and the mutual inductance current acquisition module is set at a preset position in the loop of the circuit under test. The control module is connected to the mutual inductance current acquisition module and the shunt, respectively. The control module acquires the first current data collected by the mutual inductance current acquisition module between the discharge start time of the power supply in the nuclear fusion device and a preset time. The preset time is greater than or equal to the time when the power supply generates a step signal during discharge. The step signal is generated at the instant of discharge when the power supply is used to acquire the current of the power supply using a shunt. The power supply provides power to the magnet coil in the nuclear fusion device. The preset time is included after the discharge start time. The current data during the first discharge period and the current data during the second discharge period are compared in real time. When the two current data deviate, the time of deviation is taken as the preset time. The control module acquires the second current data collected by the shunt between the preset time and the end time of the discharge of the power supply; The control module splices the first current data and the second current data according to the acquisition timing to obtain the discharge current data.

8. The device for measuring discharge current in a nuclear fusion device as described in claim 7, characterized in that, The control module is also used to control the mutual inductance current acquisition module and the shunt to simultaneously acquire current during the discharge period between the discharge start time and the discharge end time, and to acquire the current data acquired by the mutual inductance current acquisition module during the first discharge period and the current data acquired by the shunt during the second discharge period, respectively. The current data between the discharge start time and the preset time is extracted from the current data during the first discharge period and used as the first current data. The current data between the preset time and the end time of the discharge is extracted from the current data during the second discharge period and used as the second current data.

9. The measuring device for discharge current in a nuclear fusion device as described in claim 7, characterized in that, The control module is further configured to, between the discharge start time of the power supply in the nuclear fusion device and a preset time, control the mutual inductance current acquisition module to be in an enabled state and control the shunt to be in a disabled state, and acquire the first current data obtained by the mutual inductance current acquisition module from the power supply; and between the preset time and the discharge end time of the power supply, control the shunt to be in an enabled state and control the mutual inductance current acquisition module to be in a disabled state, and acquire the second current data obtained by the shunt from the power supply.

10. The measuring device for discharge current in a nuclear fusion device as described in claim 9, characterized in that, Also includes: A first control switch is connected in parallel with the shunt. The control terminal of the first control switch is connected to the control module. When the first control switch is closed under the trigger of the first switch control signal output by the control module, the shunt is short-circuited, causing the shunt to be disabled. When the first switch is opened under the trigger of the first switch control signal output by the control module, the shunt is enabled. A second control switch is connected in series between the output terminal of the mutual inductance current acquisition module and the control module. The control terminal of the second control switch is connected to the control module. When the second switch is closed under the trigger of the second switch signal output by the control module, the mutual inductance current acquisition module and the control module are connected, thereby enabling the mutual inductance current acquisition module. When the control module disconnects due to the second switch signal output by the control module, the mutual inductance current acquisition module and the control module are disconnected, thus disabling the mutual inductance current acquisition module.

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