Active turn-off test device, method and system for hybrid phase commutated converters
By combining the test sample and the power supply module, the problems of high volume and cost of DC-side inductive reactance are solved, and the full equivalence and safety of the active shutdown test of the hybrid commutation converter are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-04-20
- Publication Date
- 2026-07-03
AI Technical Summary
In existing active turn-off test equipment for hybrid commutated converters, the inductive reactance value of the DC side is too large, resulting in high volume and cost, making it difficult to implement in engineering practice.
The test employs a combination of a test sample, a first inductive reactance, a second inductive reactance, a capacitor, a DC inductor, and a power supply module. Through the coordinated operation of the controller and the charging power supply, energy is provided to maintain a constant DC current. Active shutdown testing can be achieved using an inductor with a small reactance value.
While reducing the size of the DC inductor and lowering the cost, we can achieve full equivalence to the actual HCC active turn-off process, thereby improving the safety and feasibility of the experiment.
Smart Images
Figure CN122330558A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of high voltage DC equipment technology, specifically to an active shutdown test device, method and system for a hybrid commutated converter. Background Technology
[0002] When a line commutated converter (LCC) based on a semi-controlled thyristor performs AC-DC conversion at the sending or receiving end, fluctuations in the AC grid voltage or internal faults in the converter may cause commutation failure at the receiving end, leading to DC power transmission interruption and overvoltage at the sending end.
[0003] Hybrid commutated converters (HCCs) are developed based on LCCs. Unlike LCCs, which use semi-controlled devices as commutation components, HCCs employ fully controlled integrated gate-commutated thyristors (IGCTs) as commutation components. Because IGCTs have active turn-off capability, HCCs can perform active turn-off operations in the event of a commutation failure, thereby preventing commutation failure from occurring.
[0004] The core condition for supporting the active turn-off process is to maintain a constant DC-side current. This requires the DC-side inductive reactance to have a very high inductive reactance value and the ability to withstand a large current of thousands of amperes for a long time. The larger the inductive reactance value of the DC-side inductive reactance, the larger the corresponding volume. Moreover, the larger the inductive reactance value, the higher the cost of the DC-side inductive reactance. The large size and high cost make it difficult to implement active turn-off test equipment in engineering practice. Summary of the Invention
[0005] In view of this, this application provides an active shutdown test device, method, and system for hybrid commutated converters, which can reduce the size and cost of the active shutdown test device.
[0006] This application provides an active shutdown test device for a hybrid commutated converter, comprising: a test sample, a first inductive reactor, a second inductive reactor, a capacitor, a DC inductor, and a power supply module; the power supply module comprises multiple power supply modules connected in series; each power supply module includes a diode, a capacitor, and a controllable switch; the capacitor and the controllable switch connected in series are connected in parallel across the diode; the diodes in the multiple power supply modules are connected in series sequentially. The test sample and the first inductor are connected in series to form a first branch, and the first end and the second end of the first branch are respectively connected to the first end of the DC inductor and the first end of the capacitor. The test object and the second inductor are connected in series to form a second branch. The first and second ends of the second branch are respectively connected to the first end of the DC inductor and the second end of the capacitor. The test object includes one or more integrated gate commutated thyristors. The second end of the DC inductor is connected to the first end of the power supply module, and the second end of the power supply module is connected to the second end of the capacitor.
[0007] During the HCC active turn-off test, the DC inductor and the power supply module work together in this experimental setup. The power supply module provides energy to the DC inductor, so an inductor with a small inductive reactance can effectively maintain a basically constant DC current, which is easy to implement in engineering. This setup achieves full equivalence to the actual HCC active turn-off process while reducing the size and cost of the DC inductor.
[0008] One possible implementation also includes: a controller and a charging power supply; The controller is used to control the charging power supply to charge the capacitor in the power module to the target voltage, and then control the integrated gate commutator thyristor in the test sample to conduct. According to the preset timing sequence, the controller sequentially controls the controllable switches in each of the power modules to conduct, so that the current of the DC inductor reaches the test rated current.
[0009] The test equipment also includes a controller and a charging power supply. The controller is used to charge the capacitors in the power module to the target voltage before the integrated gate commutated thyristor in the test sample is turned on, thereby providing an energy source for the power module. The controller is used to control the controllable switches in each power module to turn on according to a preset timing sequence, thereby controlling the capacitors inside the power module to be connected in a predetermined timing sequence. The capacitors inside the power module can discharge through the charging circuit composed of the DC inductor, the test sample, the second inductive reactor and the supplementary power supply module, to supplement the energy of the test circuit, so that the current of the DC side inductor remains basically constant, thereby achieving a comprehensive equivalence to the HCC active turn-off process under actual working conditions.
[0010] In one possible implementation, the controller is further configured to control the integrated gate commutated thyristor in the test specimen to turn on when the current of the DC inductor reaches the test rated current, and to control the integrated gate commutated thyristor in the test specimen to turn off after a dead time.
[0011] The test equipment has a controller that controls the integrated gate commutation thyristor in the test sample to conduct when the current in the DC inductor reaches the rated test current, thus establishing a commutation path from the test sample to the test sample. After the dead time process, the controller controls the integrated gate commutation thyristor in the test sample to turn off, which can establish a sufficient reverse blocking voltage for commutation from the test sample to the test sample, thereby realizing a full-process, highly equivalent simulation of the commutation process on the inverter side of the hybrid commutation converter.
[0012] In one possible implementation, the controller is further configured to control the controllable switches in each of the power modules to disconnect after the integrated gate commutated thyristor in the test sample is turned off, thereby causing the current of the first inductor to decay.
[0013] The controller of this test equipment is used to disconnect the controllable switches in each power module after the integrated gate commutator thyristor in the test sample is turned off. It can cut off the energy supply provided by the supplementary power module after the commutation process on the inverter side of the hybrid commutator is completed, so that the current of the first inductive reactor decays and is gradually dissipated to zero, thereby improving the safety of the test circuit.
[0014] One possible implementation also includes: a discharge circuit; Each capacitor in the power module corresponds to one discharge circuit. The controller is also configured to control the capacitor to discharge through the corresponding discharge circuit after the controllable switch in each of the power modules is turned off.
[0015] This test equipment, after controlling the dead time of the test sample, controls the turn-off of the test sample, thus reproducing the actual active turn-off process of HCC. After the test sample is turned off, the power supply module stops being connected, causing the current on the first inductive reactor to gradually decrease. After the power supply module stops being connected, the energy of the capacitor in the power supply module is released through a discharge circuit to ensure the safe end of the test. One possible implementation is that the number of integrated gate commutated thyristors in the test sample and the test sample is the same. The test equipment also includes: a surge arrester; The surge arrester is connected in parallel across the capacitor.
[0016] The testing equipment also includes a surge arrester. Because capacitors have poor overvoltage tolerance, a transient overvoltage exceeding the rated voltage across the capacitor's terminals may cause dielectric breakdown and permanent damage. This embodiment of the application provides an overvoltage discharge path by connecting a surge arrester in parallel across the capacitor. When the voltage exceeds the capacitor's withstand voltage threshold, the surge arrester can discharge the overvoltage energy through a grounding circuit, thereby ensuring the capacitor's safety.
[0017] This application also provides an active shutdown test system for a hybrid commutator, including a test sample and the active shutdown test equipment for a hybrid commutator described above.
[0018] This test system, during HCC active turn-off testing, controls the power supply module and the DC inductor to work together, enabling the power supply module to provide energy to the DC inductor. Therefore, using an inductor with a small inductive reactance can effectively maintain a basically constant DC-side current, which is easy to implement in engineering. It can achieve the testing of the actual HCC active turn-off process while reducing the size and cost of the DC inductor.
[0019] This application also provides an active shutdown test method for a hybrid commutated converter, applied to a test device. The test device includes: a test sample, a first inductive reactor, a second inductive reactor, a capacitor, a DC inductor, and a power supply module. The power supply module includes multiple power modules connected in series. Each power module includes a diode, a capacitor, and a controllable switch. The capacitor and the controllable switch, connected in series, are connected in parallel across the diode. The diodes in the multiple power modules are connected in series sequentially. The test sample and the first inductive reactor are connected in series to form a first branch, with the first and second ends of the first branch respectively connected to the first end of the DC inductor and the first end of the capacitor. The test sample and the second inductive reactor are connected in series to form a second branch, with the first and second ends of the second branch respectively connected to the first end of the DC inductor and the second end of the capacitor. The test sample includes one or more integrated gate commutated thyristors. The second end of the DC inductor is connected to the first end of the power supply module, and the second end of the power supply module is connected to the second end of the capacitor. The method includes: controlling the integrated gate commutator thyristor in the test sample to conduct, controlling the controllable switches in each of the power modules to conduct; controlling the integrated gate commutator thyristor in the test sample to conduct, and controlling the integrated gate commutator thyristor in the test sample to turn off after a dead time; and controlling the controllable switches in each of the power modules to disconnect.
[0020] This experimental method, during the HCC active turn-off test, controls the coordinated operation of the power supply module and the DC inductor, enabling the power supply module to provide energy to the DC inductor. Therefore, using an inductor with a small inductive reactance can effectively maintain a basically constant DC-side current, making it easy to implement in engineering. It allows for comprehensive testing of the HCC active turn-off process while reducing the size and cost of the DC inductor.
[0021] One possible implementation method, the test equipment further includes: a charging power supply; controlling the integrated gate commutation thyristor in the test specimen to conduct, and controlling the controllable switches in each of the power supply modules to conduct, including: controlling the charging power supply to charge the capacitor in the power supply module to the target voltage, then controlling the integrated gate commutation thyristor in the test specimen to conduct, and sequentially controlling the controllable switches in each of the power supply modules to conduct according to a preset timing sequence, so that the current of the DC inductor reaches the test rated current.
[0022] This test method, before controlling the integrated gate commutator thyristor in the test sample to conduct, controls the charging power supply to charge the capacitor in the power module to the target voltage, thereby providing an energy source for the power module; the controller is used to control the controllable switches in each power module to conduct according to a preset timing sequence, thereby controlling the capacitor inside the power module to be connected according to a predetermined timing sequence. The capacitor inside the power module can discharge through the charging circuit composed of DC inductor, test sample, second inductive reactor and supplementary power supply module, to supplement the energy of the test circuit, so that the current of DC side inductor remains basically constant, thereby achieving a comprehensive equivalence to the HCC active turn-off process under actual working conditions.
[0023] One possible implementation method, after the integrated gate-commutated thyristor in the test sample is turned off, further includes: controlling the capacitor to discharge through the corresponding discharge circuit.
[0024] This test method, after the integrated gate commutator thyristor in the test sample is turned off, controls the controllable switches in each power module to disconnect. This can cut off the energy supply provided by the supplementary power module after the commutation process on the inverter side of the hybrid commutator is completed, causing the current of the first inductor to decay and gradually dissipate to zero, thereby improving the safety of the test circuit.
[0025] The active shutdown test equipment for hybrid commutated converters provided in this application includes: a test sample, a first inductor, a second inductor, a capacitor, a DC inductor, and a power supply module. During the HCC active shutdown test, the DC inductor and the power supply module work together. The power supply module provides energy to the DC inductor. Therefore, using a DC inductor with a smaller inductance value can effectively maintain the basic constancy of the DC-side current. The smaller the inductance value of the DC inductor, the smaller its size and the lower its cost, which in turn reduces the size and cost of the entire active shutdown test equipment and makes it easy to implement in engineering. Attached Figure Description
[0026] Figure 1 This is a schematic diagram of the HCC equivalent commutation circuit; Figure 2 This is a schematic diagram of an equivalent commutation circuit on the inverter side of another HCC. Figure 3A schematic diagram of an active shutdown test device for a hybrid commutator provided in an embodiment of this application; Figure 4 A schematic diagram of another active shutdown test device for a hybrid commutator provided in an embodiment of this application; Figure 5 A schematic diagram of an active shutdown test device for a hybrid commutator provided in an embodiment of this application; Figure 6 A flowchart illustrating an active shutdown test method for a hybrid commutator provided in this application embodiment; Figure 7 The voltage and current waveforms of the surge arrester in the IGCT converter valve of the test sample; Figure 8 This is a schematic diagram of a controller provided in an embodiment of this application. Detailed Implementation
[0027] The core of conducting HCC active shutdown tests lies in equivalently reproducing the stress borne by the IGCT in the HCC under actual operating conditions. Analyzing the commutation circuit of the HCC is the basis for equivalently reproducing the stress borne by the IGCT.
[0028] See Figure 1 The figure is a schematic diagram of the HCC equivalent commutation circuit.
[0029] The rectifier-side equivalent commutation circuit 101 and the inverter-side equivalent commutation circuit 102 have the same components, both including an IGCT commutator valve, a commutation inductor, and a DC-side inductor. The difference between the rectifier-side equivalent commutation circuit 101 and the inverter-side equivalent commutation circuit 102 lies in the direction of the IGCT current conduction. Since the commutation failure process occurs on the inverter side, the following detailed description will focus on the inverter-side equivalent commutation circuit 102 as an example.
[0030] The AC voltage sources in the diagram represent the three-phase AC phase voltages. The following explanation uses UC, UB, and UA as examples.
[0031] During the commutation process of the inverter-side converter, only two of the three AC phases participate in the commutation at each commutation, while the third phase remains conducting. For example, currently, the upper bridge arm converter valve of phase A and the lower bridge arm converter valve of phase B are conducting. After the commutation time is reached, the control unit triggers the lower bridge arm converter valve of phase C to open it. At the same time, using the voltage difference between phase B and phase C, a reverse voltage is applied to the lower bridge arm converter valve of phase B, causing the current to gradually transfer from the lower bridge arm converter valve of phase B to the lower bridge arm converter valve of phase C. When the current of the lower bridge arm converter valve of phase B drops to zero and the lower bridge arm converter valve of phase B is turned off, the commutation is completed. At this time, the converter valves that are conducting are the upper bridge arm converter valve of phase A and the lower bridge arm converter valve of phase C.
[0032] Since HCC is a current source converter, its DC side current can be approximately equivalent to a constant DC current Idc. When the two-phase commutation valves involved in the commutation are taken as the research object, the phase voltage difference between the two phases involved in the commutation in the three-phase AC can be equivalently represented as a commutation voltage source. Therefore, the inverter-side commutation circuit can be further equivalent.
[0033] See Figure 2 The figure shows a schematic diagram of an equivalent commutation circuit on the inverter side of another HCC.
[0034] The inverter-side equivalent circuit 102 includes a commutation inductance Lp, a commutation voltage source UL, and a DC-side inductive reactance Ldc. The DC-side inductive reactance Ldc is used to provide a stable DC-side current Idc. During inverter-side operation, when commutation is required from commutator valve 201 to commutator valve 202, if the commutation voltage source UL is insufficient to support the natural turn-off of commutator valve 201, then commutator valve 201 needs to be actively turned off to establish a sufficient reverse blocking voltage, allowing the current to transfer from commutator valve 201 to commutator valve 202, thereby achieving successful commutation.
[0035] The core condition for the active turn-off of the IGCT is maintaining a constant DC-side current Idc. During the active turn-off process, the large amount of energy stored in the commutation inductor Lp will cause a voltage spike at the moment of turn-off of the commutator valve 201. At this time, in order to protect the commutator valve 201, the surge arrester mov in the commutator valve 201 will activate, clamping the voltage across the commutator valve 201 within a safe range and absorbing the energy released by the commutation inductor Lp until the current is completely commutated to the commutator valve 202.
[0036] In the test circuit, the energy absorbed by the surge arrester mov in the IGCT converter valve comes entirely from the energy stored in the DC-side inductor Ldc. In order to keep the DC-side current Idc constant, the DC-side inductor Ldc in the test circuit needs to have a very high inductive reactance, for example, it may need to have an inductive reactance of about 10 millihenries. However, such an inductor is very expensive and difficult to implement in engineering.
[0037] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0038] See Figure 3 The figure is a schematic diagram of an active shutdown test device for a hybrid commutated converter provided in an embodiment of this application.
[0039] The active shutdown test equipment for hybrid commutated converters provided in this application includes a test sample 301, a first inductor L1, a second inductor L2, a capacitor Cb, a DC inductor L, and a power supply module BAT.
[0040] The first inductor L1 and the second inductor L2 are used to equivalently represent the commutation reactance in the actual operating condition. The reactance values of the first inductor L1 and the second inductor L2 need to be calculated based on the commutation reactance in the actual operating condition.
[0041] The DC inductor L is used in conjunction with the power supply module BAT to maintain a constant DC-side current during the test. Unlike the DC-side inductor Ldc with a very large inductive reactance value mentioned above, the inductive reactance value of the DC inductor L in this embodiment can be a smaller value, which can be one-tenth or one-hundredth of the inductive reactance value of the DC-side inductor Ldc, for example, 0.4 millihenries.
[0042] Capacitor Cb is used for the commutation voltage in the equivalent commutation process. Specifically, capacitor Cb is equipped with a charging and discharging circuit (not shown in the figure) to charge capacitor Cb before the start of the active shutdown test, establishing a voltage across capacitor Cb to a preset voltage, so that capacitor Cb provides the commutation voltage for the commutation process. The charging and discharging circuit of capacitor Cb is also used to discharge capacitor Cb after the active shutdown test is completed.
[0043] The embodiments of this application do not specifically limit the form of the charging and discharging circuit; the charging and discharging circuit only needs to meet the charging and discharging requirements of the capacitor.
[0044] The power supply module BAT consists of multiple power modules bat connected in series. For example, the power supply module BAT may consist of n power modules bat connected in series, namely the first power module bat1, the second power module bat2, and so on up to the nth power module batn. The power supply module BAT is used to provide energy replenishment to the DC inductor L, so that the current in the DC inductor remains constant.
[0045] The embodiments of this application do not specifically limit the number of power modules; the number of power modules can be set according to the test requirements.
[0046] Each power module bat includes a diode D, a capacitor C, and a controllable switch T. Capacitor C and controllable switch T are connected in series and then in parallel across diode D. Diodes D in multiple power modules bat are connected in series sequentially. For example, the first power module bat1 includes diode D1, capacitor C1, and controllable switch T1. Capacitor C1 and controllable switch T1 are connected in series and then in parallel across diode D1. The second power module bat2 includes diode D2, capacitor C2, and controllable switch T2. Capacitor C2 and controllable switch T2 are connected in series and then in parallel across diode D2. This continues until the nth power module batn includes diode Dn, capacitor Cn, and controllable switch Tn. Capacitor Cn and controllable switch Tn are connected in series and then in parallel across diode Dn. The diodes D1 in the first power module bat1, D2 in the second power module bat2, and so on up to the diodes Dn in the nth power module batn are connected in series sequentially.
[0047] Test sample 301 and first inductive reactance L1 are connected in series to form a first branch. The first and second terminals of the first branch are respectively connected to the first terminal of DC inductor L and the first terminal of capacitor Cb. Test sample 302 and second inductive reactance L2 are connected in series to form a second branch. The first and second terminals of the second branch are respectively connected to the first terminal of DC inductor L and the second terminal of capacitor Cb. Test sample 302 includes one or more IGCTs.
[0048] The second terminal of the DC inductor L is connected to the first terminal of the power supply module BAT, and the second terminal of the power supply module BAT is connected to the second terminal of the capacitor Cb.
[0049] The active shutdown test equipment for a hybrid commutated converter provided in this application includes: a test sample, a first inductor, a second inductor, a capacitor, a DC inductor, and a power supply module. During the HCC active shutdown test, the DC inductor and the power supply module work together. The power supply module provides energy to the DC inductor, thus using an inductor with a small reactance value can effectively maintain the basic constant DC-side current, which is easy to implement in engineering. It can achieve full equivalence to the actual HCC active shutdown process while reducing the size and cost of the DC inductor. To enable those skilled in the art to clearly understand the activation process of the power supply module BAT in this application embodiment, the working principle is described in detail below with reference to the accompanying drawings.
[0050] See Figure 4 The figure is a schematic diagram of an active shutdown test device for a hybrid commutator provided in an embodiment of this application.
[0051] The active shutdown test equipment for hybrid commutator provided in this application embodiment further includes: a controller 40 and a charging power supply 50.
[0052] The controller 40 controls the charging power supply 50 to charge the capacitor C in the power module bat to the target voltage, and then controls the IGCT in the test object 302 to conduct. According to a preset timing sequence, it sequentially controls the controllable switches T in each power module bat to conduct, so that the current in the DC inductor L reaches the rated test current. For example, the controller 40 controls the charging power supply 50 to charge the capacitor C1 in the first power module bat1, the capacitor C2 in the second power module bat2, and so on up to the capacitor Cn in the nth power module batn to the target voltage, and then controls the IGCT in the test object 302 to conduct. According to a preset timing sequence, it sequentially controls the controllable switches T1 in the first power module bat1, T2 in the second power module bat2, and so on up to the controllable switch Tn in the nth power module batn, so that the capacitors C1 in the first power module bat1, C2 in the second power module bat2, and so on up to the capacitor Cn in the nth power module batn discharge the DC inductor L. At this time, the capacitor C in each power module bat discharges through the charging circuit consisting of DC inductor L, test sample 302, second inductor L2, and power supply module BAT to maintain the current of DC inductor L at the test rated current.
[0053] This application does not specifically limit the voltage value provided by capacitor C in each power module bat. The voltage values provided by capacitor C in each power module bat can be equal or unequal, thereby enabling the supplementary power module BAT to provide multiple optional power compensations for the test circuit. In one possible implementation, each power module bat can be divided into multiple groups, and the capacitance values of capacitor C in different groups of power module bats can be unequal, thereby enabling different groups of power module bats to provide different amounts of energy to the test circuit. Under complex operating conditions where the commutation voltage is non-zero, by configuring differentiated voltage values for capacitor C in different groups of power module bats, combined with the timing control of the power module's activation, the supplementary power module BAT can provide different amounts of energy compensation at different times, still achieving the effect of maintaining a constant current in the DC inductor L. That is, the active shutdown test equipment for hybrid commutated converters provided in this application embodiment has the capability to handle multiple active shutdown conditions equivalent to a hybrid commutated converter.
[0054] The rated test current is the current value of the test specimen 302 when it is actively turned off. This application does not specifically limit the value of the rated test current, which can be determined according to the test requirements.
[0055] The active turn-off test equipment for hybrid commutated converters provided in this application embodiment also includes a controller and a charging power supply. The controller is used to control the charging power supply to charge the capacitor in the power module to the target voltage before controlling the integrated gate commutated thyristor in the test object to conduct, thereby providing an energy source for the power module. The controller is used to control the controllable switches in each power module to conduct in sequence according to a preset timing sequence, thereby controlling the capacitor inside the power module to be connected in a predetermined timing sequence. The capacitor inside the power module can discharge through the charging circuit composed of the DC inductor, the test object, the second inductive reactor and the supplementary power supply module to supplement the energy of the test circuit, so that the current of the DC side inductor remains basically constant, thereby achieving a comprehensive equivalence to the active turn-off process of HCC under actual working conditions.
[0056] In one possible implementation, the controller 40 is also configured to control the IGCT in the test specimen 301 to turn on when the current of the DC inductor L reaches the test rated current, and control the IGCT in the test specimen 302 to turn off after the dead time.
[0057] For example, when the current in the DC inductor L reaches the rated test current, the controller 40 controls the IGCT in the test sample 301 to conduct. At this time, the current path gradually changes from the loop consisting of the DC inductor L, the test sample 302, the second inductor L2, and the power supply module BAT to the loop consisting of the DC inductor L, the test sample 301, the first inductor L1, and the power supply module BAT.
[0058] After the dead time, the controller 40 sends a shutdown signal to the IGCT in the test object 302, controlling the IGCT in the test object 302 to turn off. At this time, the current path is completely switched to the loop consisting of DC inductor L, test object 301, first inductive reactor L1, and power supply module BAT. The dead time should be determined by the actual operating conditions, for example, it is generally tens of microseconds.
[0059] The active turn-off test equipment for a hybrid commutated converter provided in this application embodiment includes a controller that, when the current in the DC inductor reaches the rated test current, controls the integrated gate commutation thyristor in the test specimen to turn on, establishing a commutation path from the test specimen to the test specimen. After the dead time process, the controller controls the integrated gate commutation thyristor in the test specimen to turn off, which can establish a sufficient reverse blocking voltage for the commutation from the test specimen to the test specimen, thereby achieving a full-process, highly equivalent simulation of the commutation process on the inverter side of the hybrid commutated converter. In one possible implementation, the controller 40 is further configured to, after the IGCT in the test specimen 302 is turned off, control the controllable switch T in each power module bat to open, causing the current of the first inductive reactor L1 to decay.
[0060] For example, after the IGCT in the test sample 302 is turned off, the controller 40 controls the controllable switch T1 in the first power module bat1, the controllable switch T2 in the second power module bat2, and so on until the controllable switch Tn in the nth power module batn is turned off, so that all the energy in the DC inductor L and the first inductor L1 is transferred to the capacitor Cb, and the current of the first inductor L1 gradually decreases to zero.
[0061] The active shutdown test equipment for hybrid commutated converters provided in this application embodiment has a controller that controls the controllable switches in each power module to disconnect after the integrated gate commutated thyristor in the test specimen is turned off. This can cut off the energy supply provided by the supplementary power module after the commutation process on the inverter side of the hybrid commutated converter is completed, causing the current of the first inductor to decay and gradually dissipate to zero, thereby improving the safety of the test circuit.
[0062] In one possible implementation, the active shutdown test equipment for the hybrid commutator provided in this application embodiment further includes a discharge circuit (not shown in the figure), and each capacitor C in the power module bat corresponds to a discharge circuit.
[0063] The controller 40 is also used to control the capacitor C through the corresponding discharge circuit after the controllable switch T in each power module bat is turned off. For example, after the controllable switch T1 in the first power module bat1, the controllable switch T2 in the second power module bat2, and so on up to the controllable switch Tn in the nth power module batn are turned off, the controller 40 controls the discharge circuit of the first power module bat1 to release the energy of capacitor C1 in the first power module bat1, the discharge circuit of the second power module bat2 to release the energy of capacitor C2 in the second power module bat2, and so on up to the discharge circuit of the nth power module batn to release the energy of capacitor Cn in the nth power module batn.
[0064] The embodiments of this application do not specifically limit the form of the discharge circuit; the discharge circuit only needs to meet the discharge requirements of the capacitors in the power module.
[0065] The active shutdown test equipment for hybrid commutated converters provided in this application embodiment controls the shutdown of the test sample after controlling the dead time of the test sample's conduction, thereby reproducing the actual active shutdown process of the HCC. After the test sample is shut down, the power supply module is stopped from being connected, causing the current on the first inductive reactor to gradually decrease. After the power supply module is stopped from being connected, the energy of the capacitor in the power supply module is released through a discharge circuit, ensuring the safe completion of the test.
[0066] In the active shutdown test equipment for hybrid commutator provided in the above embodiments, in order to ensure the consistency of the stress IGCT bears, the number of IGCTs in the test specimen 301 and the test specimen 302 is the same.
[0067] See Figure 5 The figure is a schematic diagram of an active shutdown test device for a hybrid commutator provided in an embodiment of this application.
[0068] Another active shutdown test device for a hybrid commutator provided in this application embodiment also includes a surge arrester MOV. The surge arrester MOV is connected in parallel across the two ends of the capacitor Cb to absorb excess energy when an overvoltage occurs in the capacitor Cb, thereby preventing the capacitor Cb from being damaged by overvoltage.
[0069] The active shutdown test equipment for hybrid commutated converters provided in this application also includes a surge arrester. Because capacitors have poor overvoltage withstand capability, a transient overvoltage exceeding the rated voltage across the capacitor terminals may cause dielectric breakdown and permanent damage. This application embodiment, by connecting a surge arrester in parallel across the capacitor, provides an overvoltage discharge path for the capacitor. When the voltage exceeds the capacitor's withstand voltage threshold, the surge arrester can discharge the overvoltage energy through a grounding circuit, thereby ensuring the capacitor's safety.
[0070] Based on the active shutdown test equipment for hybrid commutated converters provided in the above embodiments, this application also provides an active shutdown test system for hybrid commutated converters. This test system includes the active shutdown test equipment for hybrid commutated converters provided in the above embodiments, and also includes a test sample.
[0071] Based on the active shutdown test equipment for hybrid commutated converters provided in the above embodiments, this application also provides an active shutdown test method for hybrid commutated converters, which will be described in detail below with reference to the accompanying drawings.
[0072] See Figure 6 The figure is a flowchart of an active shutdown test method for a hybrid commutated converter provided in an embodiment of this application.
[0073] The active shutdown test method for hybrid commutated converters provided in this application embodiment is applied to the active shutdown test equipment for hybrid commutated converters described in the above embodiments. The test equipment includes: a test sample, a first inductor, a second inductor, a capacitor, a DC inductor, and a power supply module.
[0074] The power supply module comprises multiple power modules connected in series. Each power module includes a diode, a capacitor, and a controllable switch. The capacitor and controllable switch are connected in series and then in parallel across the diodes. The diodes in the multiple power modules are connected in series sequentially. The test sample and the first inductive reactance are connected in series to form a first branch. The first and second terminals of the first branch are connected to the first terminal of the DC inductor and the first terminal of the capacitor, respectively. The test sample and the second inductive reactance are connected in series to form a second branch. The first and second terminals of the second branch are connected to the first terminal of the DC inductor and the second terminal of the capacitor, respectively. The test sample includes one or more integrated gate commutated thyristors. The second terminal of the DC inductor is connected to the first terminal of the power supply module, and the second terminal of the power supply module is connected to the second terminal of the capacitor.
[0075] The method includes: S601: Controls the conduction of the integrated gate commutated thyristor in the test sample and controls the conduction of the controllable switches in each power module.
[0076] For example, the controller controls the conduction of the IGCT in the test sample and the conduction of the controllable switches in each power module. This controls the capacitors in each power module to discharge through the charging circuit consisting of the DC inductor, the test sample, the second inductive reactor, and the power supply module, thereby maintaining the current of the DC inductor at the test rated current. This step replenishes the power to the DC inductor, keeping the current of the DC inductor constant and maintaining it at the test rated current.
[0077] S602: Controls the integrated gate commutated thyristor in the test sample to turn on, and controls the integrated gate commutated thyristor in the test sample to turn off after the dead time.
[0078] For example, when the current in the DC inductor reaches the rated test current, the controller turns on the IGCT in the test specimen. At this time, the current path, which is a loop consisting of the DC inductor, the test specimen, the second inductive reactor, and the power supply module, gradually transforms into a loop consisting of the DC inductor, the test specimen, the first inductive reactor, and the power supply module, thus establishing a commutation path from the test specimen to the test specimen. After the dead time, the controller sends a turn-off signal to the IGCT in the test specimen, controlling the IGCT in the test specimen to turn off, establishing a sufficient reverse blocking voltage for commutation. At this point, the current path is completely switched to the loop consisting of the DC inductor, the test specimen, the first inductive reactor, and the power supply module.
[0079] S603: Controls the disconnection of controllable switches in each power module.
[0080] For example, the controller controls the controllable switches in each power module to turn off, causing the power module to stop supplying internal capacitors, so that all the energy in the DC inductor and the first inductor is transferred to the capacitor, and the current in the first capacitor gradually decreases to zero.
[0081] The active turn-off test method for hybrid commutated converters provided in this application controls the energy replenishment module and the DC inductor to work together during the HCC active turn-off test. This allows the energy replenishment module to provide energy to the DC inductor, thus enabling the use of an inductor with a small inductive reactance to effectively maintain a basically constant DC-side current, which is easy to implement in engineering. It allows for comprehensive testing of the HCC active turn-off process while reducing the size and cost of the DC inductor.
[0082] In one possible implementation, the test equipment further includes a charging power supply, controls the conduction of the integrated gate commutated thyristor in the test sample, and controls the conduction of the controllable switches in each power module, including: The charging power supply is controlled to charge the capacitor in the power module to the target voltage, and then the integrated gate commutator thyristor in the test sample is controlled to conduct. According to the preset timing sequence, the controllable switches in each power module are controlled to conduct in sequence so that the current of the DC inductor reaches the test rated current.
[0083] For example, the controller controls the charging power supply to charge the capacitor in the power module to the target voltage, and then controls the IGCT in the test sample to turn on. According to the preset timing sequence, the controller controls the controllable switches in each power module to turn on in sequence. At this time, the capacitor in each power module discharges through the charging circuit composed of DC inductor, test sample, second inductor, and power supply module to maintain the current of DC inductor to reach the rated test current.
[0084] The active turn-off test method for hybrid commutated converters provided in this application controls the charging power supply to charge the capacitors in the power module to the target voltage before controlling the integrated gate commutated thyristor in the test object to conduct, thereby providing an energy source for the power module. The controller is used to control the controllable switches in each power module to conduct according to a preset timing sequence, thereby controlling the capacitors inside the power module to be connected according to a predetermined timing sequence. The capacitors inside the power module can discharge through the charging circuit composed of the DC inductor, the test object, the second inductive reactor and the supplementary power supply module, to supplement the energy of the test circuit, so that the current of the DC side inductor remains basically constant, thereby achieving a comprehensive equivalence to the active turn-off process of HCC under actual operating conditions.
[0085] One possible implementation further includes, after the integrated gate-commutated thyristor in the test sample is turned off, controlling the capacitor to discharge through a corresponding discharge circuit.
[0086] For example, after the controller turns off the test sample, it controls the controllable switches in each power module to turn off, so that all the energy in the DC inductor and the first inductor is transferred to the capacitor, and the current in the first inductor gradually decreases to zero.
[0087] The active shutdown test method for hybrid commutated converters provided in this application embodiment controls the controllable switches in each power module to disconnect after the integrated gate commutated thyristor in the test sample is turned off. This can cut off the energy supply provided by the supplementary power module after the commutation process on the inverter side of the hybrid commutated converter is completed, causing the current of the first inductor to decay and gradually dissipate to zero, thereby improving the safety of the test circuit.
[0088] The active shutdown test equipment, method, and system for hybrid commutated converters provided in this application can achieve full equivalence to the actual active shutdown process of HCC.
[0089] See Figure 7 The figure shows the voltage and current waveforms of the surge arrester in the IGCT converter valve of the test sample.
[0090] I represents the current flowing through the surge arrester, and U is the voltage across the surge arrester. Figure 7 As can be seen from the voltage, current, and the rate of change of voltage and current over time, the active turn-off test equipment, method, and system for hybrid commutated converters provided in this application embodiment can highly and realistically reproduce the electrical stress borne by the IGCT during the entire active turn-off process of the HCC.
[0091] The active turn-off test equipment, method, and system for hybrid commutated converters provided in this application include a supplementary power supply module. During the HCC active turn-off test, by controlling the activation of the supplementary power supply module, energy is supplied to the DC inductor. Using a DC inductor with a relatively small inductive reactance, the DC-side current can be effectively maintained at a relatively constant level, which is easy to implement in engineering. The test object is turned off after the dead time of the test object's conduction, and the supplementary power supply module is deactivated after commutation is completed, achieving full equivalence to the actual HCC active turn-off process.
[0092] The controller provided in this application embodiment may include software to implement the control method described above. Alternatively, the controller provided in this application embodiment may include hardware to implement the control method described above. Or, the controller provided in this application embodiment may include both software and hardware, using a combination of software and hardware to execute the control method described above.
[0093] In one possible implementation, see Figure 8 This figure is a schematic diagram of a controller provided in an embodiment of this application.
[0094] The controller may include a memory 4011 and a processor 4012. The processor 4012 can be connected to the testing equipment and can drive the controllable switching transistors in the testing equipment. Figure 7As shown, the memory can be random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (Electronic Programmable ROM), registers, hard disks, removable disks, etc.
[0095] The memory 4011 can store computer instructions. When the computer instructions stored in the memory 4011 are executed by the processor 4012, the processor 4012 can be used to execute the control method of the test equipment. The memory 4011 can also store data, such as preset timing, preset voltage, preset current and other information involved in the above embodiments.
[0096] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape) or a semiconductor medium (e.g., solid-state disk (SSD)).
[0097] This application also provides a readable storage medium for storing the methods provided in the above embodiments. Examples include random access memory (RAM), flash memory, read-only memory (ROM), EPROM, non-volatile read-only memory (EPROM), registers, hard disks, removable disks, or any other form of storage medium in the art.
[0098] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.
[0099] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. An active shutdown test device for a hybrid commutator converter, characterized in that, include: The test sample, a first inductively coupled reactor, a second inductively coupled reactor, a capacitor, a DC inductor, and a power supply module; the power supply module includes multiple power modules connected in series; each power module includes a diode, a capacitor, and a controllable switch; the capacitor and the controllable switch connected in series are connected in parallel across the diode; the diodes in the multiple power modules are connected in series sequentially. The test sample and the first inductor are connected in series to form a first branch, and the first end and the second end of the first branch are respectively connected to the first end of the DC inductor and the first end of the capacitor. The test object and the second inductor are connected in series to form a second branch. The first and second ends of the second branch are respectively connected to the first end of the DC inductor and the second end of the capacitor. The test object includes one or more integrated gate commutated thyristors. The second end of the DC inductor is connected to the first end of the power supply module, and the second end of the power supply module is connected to the second end of the capacitor.
2. The testing equipment according to claim 1, characterized in that, Also includes: Controller and charging power supply; The controller is used to control the charging power supply to charge the capacitor in the power module to the target voltage, and then control the integrated gate commutator thyristor in the test sample to conduct. According to the preset timing sequence, the controller sequentially controls the controllable switches in each of the power modules to conduct, so that the current of the DC inductor reaches the test rated current.
3. The testing equipment according to claim 2, characterized in that, The controller is also used to control the integrated gate commutator thyristor in the test specimen to turn on when the current of the DC inductor reaches the test rated current, and to control the integrated gate commutator thyristor in the test specimen to turn off after the dead time.
4. The testing equipment according to claim 3, characterized in that, The controller is also used to control the controllable switches in each of the power modules to disconnect after the integrated gate commutated thyristor in the test sample is turned off, so as to reduce the current of the first inductor.
5. The testing equipment according to claim 4, characterized in that, Also includes: Discharge circuit; Each capacitor in the power module corresponds to one discharge circuit. The controller is also configured to control the capacitor to discharge through the corresponding discharge circuit after the controllable switch in each of the power modules is turned off.
6. The testing equipment according to any one of claims 1-5, characterized in that, The number of integrated gate commutated thyristors in the test specimen and the test specimen are the same; The test equipment also includes: a surge arrester; The surge arrester is connected in parallel across the capacitor.
7. An active shutdown test system for a hybrid commutator converter, characterized in that, Includes the test sample and the active shutdown test equipment for the hybrid commutator as described in any one of claims 1-6.
8. A method for active shutdown testing of a hybrid commutator, characterized in that, The invention relates to a testing device comprising: a test sample, a first inductive reactance, a second inductive reactance, a capacitor, a DC inductor, and a power supply module. The power supply module comprises multiple power modules connected in series. Each power module includes a diode, a capacitor, and a controllable switch. The capacitor and the controllable switch, connected in series, are connected in parallel across the diode. The diodes in the multiple power modules are sequentially connected in series. The test sample and the first inductive reactance are connected in series to form a first branch, with the first and second ends of the first branch respectively connected to the first end of the DC inductor and the first end of the capacitor. The test sample and the second inductive reactance are connected in series to form a second branch, with the first and second ends of the second branch respectively connected to the first end of the DC inductor and the second end of the capacitor. The test sample includes one or more integrated gate commutated thyristors. The second end of the DC inductor is connected to the first end of the power supply module, and the second end of the power supply module is connected to the second end of the capacitor. The method includes: Control the conduction of the integrated gate commutated thyristor in the test sample, and control the conduction of the controllable switches in each of the power modules; The integrated gate commutator thyristor in the test sample is turned on, and after the dead time, the integrated gate commutator thyristor in the test sample is turned off. The controllable switches in each of the power modules are turned off.
9. The method according to claim 8, characterized in that, The test equipment further includes: a charging power supply; and controls the conduction of the integrated gate commutated thyristors in the test sample and the conduction of the controllable switches in each of the power supply modules, including: The charging power supply is controlled to charge the capacitor in the power module to the target voltage, and then the integrated gate commutator thyristor in the test sample is controlled to conduct. According to the preset timing sequence, the controllable switches in each power module are controlled to conduct in sequence, so that the current of the DC inductor reaches the test rated current.
10. The method according to claim 8 or 9, characterized in that, After the integrated gate-commutated thyristor in the test specimen is turned off, the test specimen further includes: The capacitor is controlled to discharge through the corresponding discharge circuit.