Equivalent experiment device and method for thyristor type direct current energy consumption device
By using a combination of capacitors and inductors in an equivalent experimental device of a thyristor-type DC energy dissipation device to control the on and off of the switch and simulate energy dissipation pulses, the high cost problem of the existing device is solved and a more economical and accurate experimental effect is achieved.
Patent Information
- Application Number
- CN202510989311.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2025-09-26
AI Technical Summary
The experimental cost of the equivalent experimental device of the existing thyristor type DC energy dissipation device is high, especially when simulating the multi-pulse working condition in the second level, a huge capacitor is required, resulting in excessive cost.
A circuit structure including a first capacitor, a first diode, a first switch, a second diode, a first inductor, and a third diode is adopted. By controlling the on and off of the first switch, the first capacitor is used to provide initial energy and current to simulate the energy consumption pulse in the actual operation scenario, and the inductor energy storage is used to realize the increase and decrease of energy, thereby avoiding the use of resistors to consume energy.
It reduces the cost of equivalent experiments, accurately reproduces the actual energy consumption process, simulates energy consumption pulses of different amplitudes, and makes the dynamic energy flow closer to the actual device, avoiding the energy attenuation caused by resistance.
Smart Images
Figure CN120703499A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of flexible direct current (DC) power transmission, and in particular to an equivalent experimental device and method for a thyristor type DC energy dissipation device. Background Art
[0002] Flexible DC transmission technology has been widely used in large-scale offshore wind power transmission due to its flexible control, low losses, and ability to operate in a black start mode. In offshore wind power Flexible DC transmission systems, when a low-voltage fault occurs on the AC side of a receiving converter station, the AC grid voltage drops, reducing the converter station's power delivery capacity. However, the wind turbine's power output remains constant for a short period of time, and the resulting system power surplus causes the DC transmission line voltage to rise, endangering the safety of core equipment such as the Flexible DC converter valves. Thyristor-type DC energy dissipation devices are highly effective in addressing AC-side faults in high-voltage, high-capacity Flexible DC systems, offering excellent technical and economic advantages.
[0003] Typically, after proposing a new DC energy dissipation device, prototype development is required to verify the proposed solution's effectiveness. Existing equivalent experimental setups for thyristor-based DC energy dissipation devices use a capacitor as a DC voltage source, with a resistor connected in series in the loop to simulate the dissipation current. However, due to the presence of resistance in the loop, energy is significantly attenuated, requiring a large capacitor to achieve the equivalent operating condition of the energy dissipation device's multi-pulse operation in seconds. This results in high experimental costs, leading to the high experimental costs of existing equivalent experimental setups for thyristor-based DC energy dissipation devices. Summary of the Invention
[0004] The present invention provides an equivalent experimental device and method for a thyristor type DC energy dissipation device, which can overcome the defect of high experimental cost of the existing equivalent experimental device for thyristor type DC energy dissipation device.
[0005] An embodiment of the present invention provides an equivalent experimental device for a thyristor-type DC energy dissipation device, comprising: a first capacitor, a first diode, a first switch, a second diode, a first inductor, and a third diode;
[0006] The anode of the first diode is connected to the first end of the first switch, the second end of the first switch is connected to the cathode of the first diode, the cathode of the first diode is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the anode of the second diode, the cathode of the second diode is connected to the first end of the first switch, the first end of the first switch is connected to the first end of the first inductor, the second end of the first inductor is connected to the anode of the third diode, the cathode of the third diode is connected to the input end of the thyristor type DC energy consumption device group to be tested, and the anode of the second diode is connected to the output end of the thyristor type DC energy consumption device group to be tested;
[0007] When the first resonant current of the first inductor does not reach a preset threshold, the first switch is in an on state; when the first resonant current reaches a preset threshold, the first switch is in an off state.
[0008] Furthermore, the equivalent experimental device of the thyristor type DC energy dissipation device described in the above embodiment further includes: a DC voltage source;
[0009] The positive electrode of the DC voltage source is connected to the anode of the first diode, and the negative electrode of the DC voltage source is connected to the second end of the first capacitor.
[0010] Furthermore, the equivalent experimental device of the thyristor type DC energy dissipation device described in the above embodiment further includes: a second switch;
[0011] A first end of the second switch is connected to the negative electrode of the DC voltage source, and a second end of the second switch is connected to the second end of the first capacitor.
[0012] Furthermore, the thyristor type DC energy consumption device group to be tested includes: one or more thyristor type DC energy consumption devices to be tested; each of the thyristor type DC energy consumption devices to be tested includes: a second capacitor, a second inductor, a thyristor, and a voltage-sharing resistor;
[0013] When there is only one thyristor type DC energy consumption device to be tested in the group of thyristor type DC energy consumption devices to be tested, the anode of the thyristor of the thyristor type DC energy consumption device to be tested serves as the input end of the group of thyristor type DC energy consumption devices to be tested, the cathode of the thyristor serves as the output end of the group of thyristor type DC energy consumption devices to be tested, the anode of the thyristor is connected to the first end of the second capacitor, the second end of the second capacitor is connected to the first end of the second inductor, the second end of the second inductor is connected to the cathode of the thyristor, the cathode of the thyristor is connected to the first end of the grading resistor, and the cathode of the thyristor is connected to the second end of the grading resistor.
[0014] Furthermore, when there are multiple thyristor type DC energy consumption devices to be tested in the group of thyristor type DC energy consumption devices to be tested, except for the last thyristor type DC energy consumption device to be tested, the cathode of the thyristor in each thyristor type DC energy consumption device to be tested is connected to the anode of the thyristor in the next thyristor type DC energy consumption device to be tested, and the anode of the thyristor of the first thyristor type DC energy consumption device to be tested is the input end of the group of thyristor type DC energy consumption devices to be tested, and the cathode of the thyristor of the last thyristor type DC energy consumption device to be tested is the output end of the group of thyristor type DC energy consumption devices to be tested.
[0015] Furthermore, the second switch is a mechanical switch.
[0016] Furthermore, the first switch is an insulated gate bipolar transistor.
[0017] An embodiment of the present invention further provides an equivalent test method for a thyristor type DC energy dissipation device, characterized in that it is applied to an equivalent test device for a thyristor type DC energy dissipation device as described in any one of the above-mentioned embodiments of the invention;
[0018] The method comprises:
[0019] charging the first capacitor and the second capacitor in the thyristor-type DC energy consumption device to be tested;
[0020] When it is determined that the first voltage of the first capacitor and the second voltage of the second capacitor are equal, turning on the first switch and the thyristor in the thyristor-type DC energy consumption device to be tested;
[0021] When it is determined that the first resonant current of the first inductor rises to a preset threshold value, the first switch is cut off, so that the first inductor serves as a current source for performing an equivalent experiment on the thyristor type DC energy consumption device to be tested;
[0022] When it is determined that the first resonant current of the first inductor is equal in magnitude and opposite in direction to the second resonant current of the second inductor in the thyristor-type DC energy consumption device to be tested, the thyristor is cut off so that the first inductor, the third diode, the second capacitor, the second inductor, and the second diode form a loop and continue to resonate until the current in the loop drops to 0.
[0023] Furthermore, charging the first capacitor and the second capacitor in the thyristor-type DC energy consumption device to be tested includes:
[0024] The second switch is closed so that the DC voltage source, the first diode, the first capacitor, and the second switch form a first charging loop to charge the first capacitor, and the DC voltage source, the first inductor, the third diode, the thyristor-type DC energy consumption device to be tested, and the second switch form a second charging loop to charge the second capacitor.
[0025] Furthermore, when it is determined that the first resonant current of the first inductor rises to a preset threshold, turning off the first switch includes:
[0026] The first resonant current is monitored, and when it is determined that the first resonant current of the first inductor is not less than a preset threshold, a low level is applied to the first switch to disconnect the first switch.
[0027] The following beneficial effects are achieved by implementing the present invention:
[0028] The present invention provides an equivalent experimental device and method for a thyristor-type DC energy consumption device. The device comprises: a first capacitor, a first diode, a first switch, a second diode, a first inductor, and a third diode; the anode of the first diode is connected to the first end of the first switch, the second end of the first switch is connected to the cathode of the first diode, the cathode of the first diode is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the cathode of the second diode, the cathode of the second diode is connected to the first end of the first switch, the first end of the first switch is connected to the first end of the first inductor, the second end of the first inductor is connected to the anode of the third diode, the cathode of the third diode is connected to the input end of the thyristor-type DC energy consumption device to be tested, and the anode of the second diode is connected to the output end of the thyristor-type DC energy consumption device to be tested. When conducting an equivalent experiment, the first capacitor is used to provide the initial energy and current required for the experiment, and then the energy input to the thyristor-type DC energy consumption device is flexibly adjusted by controlling the first switch to simulate energy consumption pulses of different amplitudes in actual operation scenarios. The increase and decrease of energy is achieved by storing energy in the first inductor, and no resistor is required to consume energy, which is closer to the dynamic energy flow law of the actual device. Furthermore, the first diode, the second diode, the third diode and the first inductor resonate and the first switch is opened and closed to ensure that the equivalent experimental device accurately reproduces the actual energy consumption process, thereby overcoming the defect of high experimental cost of the equivalent experimental device of the existing thyristor-type DC energy consumption device. BRIEF DESCRIPTION OF THE DRAWINGS
[0029] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0030] Figure 1 This is a schematic diagram of the circuit structure of an equivalent experimental device for a thyristor-type DC energy dissipation device provided in one embodiment of the present application;
[0031] Figure 2 This is a flow chart of an equivalent experimental method for a thyristor-type DC energy dissipation device provided in one embodiment of the present application;
[0032] Figure 3 This is a schematic diagram of the circuit structure of an equivalent experimental device for a thyristor-type DC energy dissipation device provided in another embodiment of the present application;
[0033] Figure 4 This is a schematic diagram of the circuit structure of an equivalent experimental device for a thyristor-type DC energy dissipation device provided in another embodiment of the present application;
[0034] Figure 5This is a schematic diagram of current flow of an equivalent experimental device of a thyristor-type DC energy dissipation device provided in one embodiment of the present application at time t1 of the equivalent experiment;
[0035] Figure 6 This is a schematic diagram of current flow of an equivalent experimental device of a thyristor-type DC energy dissipation device provided in a certain embodiment of the present application at time t2 of the equivalent experiment;
[0036] Figure 7 This is a schematic diagram of current flow of an equivalent experimental device of a thyristor-type DC energy dissipation device provided in one embodiment of the present application at time t3 of the equivalent experiment;
[0037] Figure 8 The present invention is a circuit structure diagram of an equivalent experimental device of an existing thyristor type DC energy dissipation device. DETAILED DESCRIPTION
[0038] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions in this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.
[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.
[0040] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.
[0041] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.
[0042] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.
[0043] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).
[0044] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.
[0045] See also Figure 1 In order to overcome the high experimental cost of the equivalent experimental device of the existing thyristor type DC energy dissipation device, an embodiment of the present invention provides an equivalent experimental device of the thyristor type DC energy dissipation device, comprising: a first capacitor 1, a first diode 2, a first switch 3, a second diode 4, a first inductor 5, and a third diode 6;
[0046] The anode of the first diode 2 is connected to the first end of the first switch 3, the second end of the first switch 3 is connected to the cathode of the first diode 2, the cathode of the first diode 2 is connected to the first end of the first capacitor 1, the second end of the first capacitor 1 is connected to the anode of the second diode 4, the cathode of the second diode 4 is connected to the first end of the first switch 3, the first end of the first switch 3 is connected to the first end of the first inductor 5, the second end of the first inductor 5 is connected to the anode of the third diode 6, the cathode of the third diode 6 is connected to the input end of the thyristor type DC energy consumption device group to be tested, and the anode of the second diode 4 is connected to the output end of the thyristor type DC energy consumption device group to be tested;
[0047] When the first resonant current of the first inductor 5 does not reach the preset threshold, the first switch is in the on state; when the first resonant current reaches the preset threshold, the first switch is in the off state.
[0048] Preferably, the equivalent experimental device of the thyristor type DC energy consumption device described in the above embodiment further includes: a DC voltage source 8;
[0049] The positive electrode of the DC voltage source 8 is connected to the anode of the first diode 2 , and the negative electrode of the DC voltage source 8 is connected to the second end of the first capacitor 1 .
[0050] Preferably, the equivalent experimental device of a thyristor type DC energy dissipation device described in the above embodiment further includes: a second switch 9;
[0051] The first end of the second switch 9 is connected to the negative electrode of the DC voltage source 8, and the second end of the second switch 9 is connected to the second end of the first capacitor 1.
[0052] Preferably, the first switch 3 is a mechanical switch.
[0053] Preferably, the second switch 9 is an insulated gate bipolar transistor.
[0054] Preferably, the thyristor type DC energy consuming device group to be tested includes: one or more thyristor type DC energy consuming devices 7 to be tested; each of the thyristor type DC energy consuming devices 7 to be tested includes: a second capacitor 71, a second inductor 72, a thyristor 73, and a voltage balancing resistor 74;
[0055] When there is only one thyristor type DC energy consumption device 7 to be tested in the thyristor type DC energy consumption device group to be tested, the anode of the thyristor 73 of the thyristor type DC energy consumption device to be tested 7 serves as the input end of the thyristor type DC energy consumption device group to be tested, the cathode of the thyristor 73 serves as the output end of the thyristor type DC energy consumption device group to be tested, the anode of the thyristor 73 is connected to the first end of the second capacitor 71, the second end of the second capacitor 71 is connected to the first end of the second inductor 72, the second end of the second inductor 72 is connected to the cathode of the thyristor 73, the cathode of the thyristor 73 is connected to the first end of the grading resistor 74, and the cathode of the thyristor 73 is connected to the second end of the grading resistor 74.
[0056] In a preferred embodiment of the present invention, an equivalent experimental device of an existing thyristor type DC energy dissipation device is as follows: Figure 8 As shown in the figure, in traditional devices, the core role of the resistor is to consume energy (convert electrical energy into heat energy), which simulates the function of the energy-consuming resistor in the actual device. However, in order to achieve "second-level multi-pulse working conditions" (i.e., long-term, multiple energy dissipation cycles), a huge capacitor is required to provide continuous energy, otherwise the capacitor voltage will drop rapidly due to the consumption of the resistor, and the pulse stability cannot be maintained. The equivalent experimental device of the thyristor type DC energy dissipation device disclosed in this embodiment is as follows Figure 1 As shown, it includes: a first capacitor 1, a first diode 2, a first switch 3, a second diode 4, a first inductor 5, a third diode 6 and a thyristor type DC energy consumption device group to be tested. At the beginning of the experiment, the first switch 3 is in the off state, and Figure 3 The connection mode shown in FIG. 1 uses a DC voltage source 8 and a second switch 9 to charge the first capacitor 1 and the thyristor type DC energy consuming device to be tested. Specifically, Figure 5 As shown in FIG. 1 (a), the DC voltage source 8, the first diode 2, the first capacitor 1, and the second switch 9 form a first charging circuit to charge the first capacitor 1. Figure 5 As shown in FIG. 1( b ), a DC voltage source 8, a first inductor 5, a third diode 6, a thyristor-type DC energy consuming device to be tested, and a second switch 9 form a second charging circuit to charge the second capacitor. This allows the first capacitor 1 to subsequently provide the initial energy and current required for the experiment, keeping the thyristor-type DC energy consuming device to be tested 7 in an operating state. Because both the first capacitor 1 and the thyristor-type DC energy consuming device to be tested are connected in parallel to the voltage source, the voltages across them are equal when charging reaches a steady state.
[0057] Further, such as Figure 6 As shown in FIG. 1 , after charging is completed, the power supply is disconnected. At time t1, the first switch 3 and the thyristor 73 in the thyristor type DC energy consuming device 7 to be tested are turned on simultaneously. The circuit current begins to increase, and resonance begins to enter the thyristor type DC energy consuming device 7 to be tested.
[0058] When the first switch 3 and the thyristor are turned on at the same time at time t1, the voltage of the second capacitor 71 begins to drop. Figure 6 As shown in FIG. 1 , at time t2, the first switch 3 is turned off, cutting the first capacitor 1 out of the circuit. At this time, the thyristor type DC energy consuming device 7 to be tested continues to resonate, and the current on the first inductor 5 rises to a peak value (preset threshold value). The current passes through the third diode 6 and continues to flow through the second diode 4 and the thyristor 73 in the thyristor type DC energy consuming device 7 to be tested, until the resonant current in the thyristor type DC energy consuming device 7 to be tested is equal to the current in the first inductor 5 in magnitude and opposite in direction. The thyristor 73 is turned off due to the current crossing zero, and the time enters time t3.
[0059] like Figure 7 As shown, at time t3, the second capacitor 71, the second inductor 72, the first inductor 5, the third diode 6, and the second diode 4 form a series connection, and the second capacitor 71, the second inductor 72, and the first inductor 5, these three components continue to resonate in this path until the main circuit current drops to zero and the voltage on the second capacitor 71 reaches the positive maximum value.
[0060] It is understood that the LC resonant circuit formed by the second capacitor 71 and the second inductor 72 in the thyristor-type DC energy dissipation device 7 to be tested will generate energy oscillations (capacitor discharge → inductor energy storage → inductor discharge → capacitor reverse charging, etc.) when the thyristor 73 is turned on. By actively turning off the thyristor 73 when the current passes through zero, the circuit is severed and the oscillations are terminated. This process is equivalent to the state where "the circuit stops oscillating after energy is dissipated by the resistor."
[0061] For example, when the energy consumption simulation needs to be completed, the thyristor 73 is turned off, the resonant circuit current is interrupted, and the remaining energy can be released through the first switch 3, the second diode 4, and the third diode 6 of other auxiliary branches, thereby reproducing the circuit characteristics of "energy dissipation completed" without the need for resistors.
[0062] Furthermore, first capacitor 1 and first inductor 5 can provide the initial energy and current required for the experiment, with their parameters (voltage and inductance) set according to the equivalent requirements of the actual device. By controlling the on and off of first switch 3, the energy input to the resonant circuit can be flexibly adjusted, simulating energy-consuming pulses of varying amplitudes in an actual device without requiring resistors to "consume" this energy. In other words, energy increases and decreases are achieved through capacitor charging and discharging and inductor energy storage, more closely resembling the dynamic energy flow patterns of an actual device.
[0063] Finally, while the resistor "damping" of traditional equivalent experimental setups causes energy to gradually decay, the experimental setup in this embodiment simulates "multi-pulse energy consumption" by repeatedly turning the first switch on and off. Each time the thyristor is turned on, the resonant circuit initiates an energy oscillation; each time the thyristor is turned off, the oscillation ends, equivalent to the end of a single energy consumption pulse. This actively controlled "pulse energy process" eliminates the need for continuous resistor damping, reproducing multi-pulse operating conditions and making it easier to adjust the pulse frequency and amplitude using timing parameters.
[0064] Preferably, when there are multiple thyristor type DC energy consumption devices 7 to be tested in the thyristor type DC energy consumption device group to be tested, except for the last thyristor type DC energy consumption device 7 to be tested, the cathode of the thyristor 73 in each thyristor type DC energy consumption device 7 to be tested is connected to the anode of the thyristor 73 in the next thyristor type DC energy consumption device 7 to be tested, and the anode of the thyristor 73 of the first thyristor type DC energy consumption device 7 to be tested is the input end of the thyristor type DC energy consumption device group to be tested, and the cathode of the thyristor 73 of the last thyristor type DC energy consumption device 7 to be tested is the output end of the thyristor type DC energy consumption device group to be tested.
[0065] In a preferred embodiment of the present invention, Figure 4As shown, multiple thyristor-type DC energy consuming devices 7 to be tested can be connected in series between the cathode of the third diode 6 and the anode of the second diode 4, so that equivalent experimental verification can be performed on n thyristor-type DC energy consuming devices to be tested simultaneously. However, it should be noted that compared with a single thyristor-type DC energy consuming device 7 to be tested, the voltage level of the DC voltage source 8 needs to be increased by n times, and the inductance value of the first inductor 5 needs to be increased by n times.
[0066] In summary, an embodiment of the present invention provides an equivalent experimental device for a thyristor-type DC energy consumption device, including: a first capacitor, a first diode, a first switch, a second diode, a first inductor, and a third diode; the anode of the first diode is connected to the first end of the first switch, the second end of the first switch is connected to the cathode of the first diode, the cathode of the first diode is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the anode of the second diode, the cathode of the second diode is connected to the first end of the first switch, the first end of the first switch is connected to the first end of the first inductor, the second end of the first inductor is connected to the anode of the third diode, the cathode of the third diode is connected to the input end of the thyristor-type DC energy consumption device to be tested, and the anode of the second diode is connected to the output end of the thyristor-type DC energy consumption device to be tested. When conducting an equivalent experiment, the first capacitor is used to provide the initial energy and current required for the experiment, and then by controlling the first switch, the energy input to the thyristor-type DC energy consumption device is flexibly adjusted to simulate energy consumption pulses of different amplitudes in actual operation scenarios. The increase and decrease of energy is achieved by storing energy in the first inductor, and no resistor is required to consume energy, which is closer to the dynamic energy flow law of the actual device. Furthermore, through the resonance of the first diode, the second diode, the third diode and the first inductor and the opening and closing of the first switch, it is ensured that the equivalent experimental device accurately reproduces the actual energy consumption process, thereby overcoming the high cost defect of the equivalent experimental device of the existing thyristor-type DC energy consumption device.
[0067] It should be noted that the device embodiments described above are merely illustrative, and some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art can understand and implement the present invention without inventive effort.
[0068] See Figure 2 , is an equivalent experimental method for a thyristor-type DC energy dissipation device provided by one embodiment of the present invention, comprising:
[0069] S1, charging the first capacitor and the second capacitor in the thyristor type DC energy consumption device to be tested;
[0070] S2. When it is determined that the first voltage of the first capacitor and the second voltage of the second capacitor are equal, turning on the first switch and the thyristor in the thyristor-type DC energy consumption device to be tested;
[0071] S3. When it is determined that the first resonant current of the first inductor rises to a preset threshold value, cutting off the first switch so that the first inductor serves as a current source for performing an equivalent experiment on the thyristor-type DC energy consumption device to be tested;
[0072] S4. When it is determined that the first resonant current of the first inductor is equal in magnitude and opposite in direction to the second resonant current of the second inductor in the thyristor-type DC energy consumption device to be measured, cut off the thyristor so that the first inductor, the third diode, the second capacitor, the second inductor, and the second diode form a loop, and continue to resonate until the current in the loop drops to 0.
[0073] Furthermore, charging the first capacitor and the second capacitor in the thyristor-type DC energy consumption device to be tested includes:
[0074] S11. Close the second switch so that the DC voltage source, the first diode, the first capacitor, and the second switch form a first charging circuit to charge the first capacitor, and the DC voltage source, the first inductor, the third diode, the thyristor-type DC energy consuming device to be tested, and the second switch form a second charging circuit to charge the second capacitor.
[0075] Furthermore, when it is determined that the first resonant current of the first inductor rises to a preset threshold, turning off the first switch includes:
[0076] S31 . Monitor the first resonant current, and when it is determined that the first resonant current of the first inductor is not less than a preset threshold, apply a low level to the first switch to turn off the first switch.
[0077] In summary, an embodiment of the present invention provides an equivalent experimental method for a thyristor type DC energy consumption device. When conducting an equivalent experiment, the method uses a first capacitor to provide the initial energy and current required for the experiment, and then flexibly adjusts the energy input to the thyristor type DC energy consumption device by controlling the first switch to simulate energy consumption pulses of different amplitudes in actual operation scenarios. The increase and decrease of energy is achieved by storing energy in the first inductor, and no resistor is required to consume energy, which is closer to the dynamic energy flow law of the actual device. Furthermore, through the resonance of the first diode, the second diode, the third diode and the first inductor and the opening and closing of the first switch, it is ensured that the equivalent experimental device accurately reproduces the actual energy consumption process, thereby overcoming the high cost defect of the existing equivalent experimental device of the thyristor type DC energy consumption device.
[0078] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.
Claims
1. An equivalent experimental device for a thyristor type DC energy dissipation device, characterized in that: include: a first capacitor, a first diode, a first switch, a second diode, a first inductor, and a third diode; The anode of the first diode is connected to the first end of the first switch, the second end of the first switch is connected to the cathode of the first diode, the cathode of the first diode is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the anode of the second diode, the cathode of the second diode is connected to the first end of the first switch, the first end of the first switch is connected to the first end of the first inductor, the second end of the first inductor is connected to the anode of the third diode, the cathode of the third diode is connected to the input end of the thyristor type DC energy consumption device group to be tested, and the anode of the second diode is connected to the output end of the thyristor type DC energy consumption device group to be tested; When the first resonant current of the first inductor does not reach a preset threshold, the first switch is in an on state; when the first resonant current reaches a preset threshold, the first switch is in an off state.
2. The equivalent experimental device of a thyristor type DC energy consumption device according to claim 1, characterized in that: Also includes: DC voltage source; The positive electrode of the DC voltage source is connected to the anode of the first diode, and the negative electrode of the DC voltage source is connected to the second end of the first capacitor.
3. The equivalent experimental device of a thyristor type DC energy consumption device according to claim 2, characterized in that: Also includes: Second switch; A first end of the second switch is connected to the negative electrode of the DC voltage source, and a second end of the second switch is connected to the second end of the first capacitor.
4. The equivalent experimental device of a thyristor type DC energy consumption device according to claim 3, characterized in that: The thyristor type DC energy consumption device group to be tested includes: one or more thyristor type DC energy consumption devices to be tested; each of the thyristor type DC energy consumption devices to be tested includes: a second capacitor, a second inductor, a thyristor, and a voltage-sharing resistor; When there is only one thyristor type DC energy consumption device to be tested in the group of thyristor type DC energy consumption devices to be tested, the anode of the thyristor of the thyristor type DC energy consumption device to be tested serves as the input end of the group of thyristor type DC energy consumption devices to be tested, the cathode of the thyristor serves as the output end of the group of thyristor type DC energy consumption devices to be tested, the anode of the thyristor is connected to the first end of the second capacitor, the second end of the second capacitor is connected to the first end of the second inductor, the second end of the second inductor is connected to the cathode of the thyristor, the cathode of the thyristor is connected to the first end of the grading resistor, and the cathode of the thyristor is connected to the second end of the grading resistor.
5. The equivalent experimental device of a thyristor type DC energy consumption device according to claim 4, characterized in that: When there are multiple thyristor type DC energy consumption devices to be tested in the group of thyristor type DC energy consumption devices to be tested, except for the last thyristor type DC energy consumption device to be tested, the cathode of the thyristor in each thyristor type DC energy consumption device to be tested is connected to the anode of the thyristor in the next thyristor type DC energy consumption device to be tested, and the anode of the thyristor of the first thyristor type DC energy consumption device to be tested serves as the input end of the group of thyristor type DC energy consumption devices to be tested, and the cathode of the thyristor of the last thyristor type DC energy consumption device to be tested serves as the output end of the group of thyristor type DC energy consumption devices to be tested.
6. The equivalent experimental device of a thyristor type DC energy consumption device according to claim 5, characterized in that: The second switch is a mechanical switch.
7. The equivalent experimental device of a thyristor type DC energy consumption device according to claim 6, characterized in that: The first switch is an insulated gate bipolar transistor.
8. An equivalent experimental method for a thyristor type DC energy dissipation device, characterized in that: An equivalent experimental device applied to a thyristor type DC energy dissipation device as claimed in any one of claims 1 to 7; The method comprises: charging the first capacitor and the second capacitor in the thyristor-type DC energy consumption device to be tested; When it is determined that the first voltage of the first capacitor and the second voltage of the second capacitor are equal, turning on the first switch and the thyristor in the thyristor-type DC energy consumption device to be tested; When it is determined that the first resonant current of the first inductor rises to a preset threshold value, the first switch is cut off, so that the first inductor serves as a current source for performing an equivalent experiment on the thyristor type DC energy consumption device to be tested; When it is determined that the first resonant current of the first inductor is equal in magnitude and opposite in direction to the second resonant current of the second inductor in the thyristor-type DC energy consumption device to be tested, the thyristor is cut off so that the first inductor, the third diode, the second capacitor, the second inductor, and the second diode form a loop and continue to resonate until the current in the loop drops to 0.
9. The equivalent test method of a thyristor type DC energy consumption device according to claim 8, characterized in that: The charging of the first capacitor and the second capacitor in the thyristor type DC energy consumption device to be tested includes: The second switch is closed so that the DC voltage source, the first diode, the first capacitor, and the second switch form a first charging loop to charge the first capacitor, and the DC voltage source, the first inductor, the third diode, the thyristor-type DC energy consumption device to be tested, and the second switch form a second charging loop to charge the second capacitor.
10. An equivalent test method for a thyristor type DC energy consumption device according to claim 9, characterized in that: The method of turning off the first switch when determining that the first resonant current of the first inductor rises to a preset threshold value includes: The first resonant current is monitored, and when it is determined that the first resonant current of the first inductor is not less than a preset threshold, a low level is applied to the first switch to disconnect the first switch.