CN114725910A - Device and method for suppressing inrush current of port of direct-current transformer - Google Patents
Device and method for suppressing inrush current of port of direct-current transformer Download PDFInfo
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- CN114725910A CN114725910A CN202210643327.5A CN202210643327A CN114725910A CN 114725910 A CN114725910 A CN 114725910A CN 202210643327 A CN202210643327 A CN 202210643327A CN 114725910 A CN114725910 A CN 114725910A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The application discloses a device and a method for suppressing inrush current of a port of a direct current transformer, wherein the device comprises: a normally open branch and an inductance branch; the normal open branch includes: the fast isolating switch and the first switch component; the second end of the fast isolating switch is connected with the first end of the first switch assembly in series, the first end of the fast isolating switch is used for being connected with a direct-current line of the power distribution network, and the second end of the first switch assembly is used for being connected with the first inductor in series; and a second inductor is arranged in the inductor branch circuit, and the inductor branch circuit is connected with the normally open branch circuit in parallel. The inrush current suppression device that this application scheme provided is receiving behind the inrush current suppression start signal, normally open branch circuit switch module cuts off immediately, and the electric current shifts to the inductance branch circuit, breaks off normally open branch circuit isolator at last, finally makes the second inductance establish ties to the direct current transformer port, realizes the incremental adjustment of direct current transformer port inductance, plays the effect that the inrush current suppressed, has solved prior art and has suppressed the technical problem that the reliability is low to the inrush current of low pressure direct current distribution network.
Description
Technical Field
The application relates to the technical field of direct-current power distribution networks, in particular to a device and a method for suppressing inrush current of a port of a direct-current transformer.
Background
The major network frame of current electric wire netting is alternating current electric wire netting, consequently the form that direct current distribution network mainly used alternating current-direct current hybrid power distribution network at present stage exists, and concrete structure is: the system comprises a main network, a high-capacity converter station, a high-capacity direct-current load, a new energy power station, an energy storage micro-grid, a direct-current converter station, a direct-current transformer and a main network, wherein the main network is formed by converting alternating current into direct current through more than or equal to 2 high-capacity converter stations and is connected with a direct-current bus through a direct-current line, the high-capacity direct-current load, the new energy power station, the energy storage micro-grid and the direct-current micro-grid are hung on the direct-current bus through a direct-current conversion device with relatively small capacity, generally the direct-current transformer is formed by the whole system on the direct-current side, a direct-current network with multiple ports and multiple voltage levels is formed by the whole system on the direct-current side, and the direct-current network is connected with the main network only through the converter stations. Different from an alternating current distribution network, the main equipment of the direct current distribution network is a conversion device formed by a large number of power electronic devices, the current tolerance of the devices is lower than that of a transformer of a traditional alternating current network, and because the transient state path impedance is small and a large number of capacitors exist in the transient state path impedance, the development speed of direct current fault current and direct current power flow change is far higher than that of the alternating current distribution network, so that the direct current distribution network is required to have a fault protection action speed reaching hundreds of microseconds, the direct current distribution network protection is mainly based on the protection of port equipment and is tightly matched with devices such as a direct current breaker and a current limiter, and the direct current distribution network protection system is a mature protection system which is practically verified in a high-voltage large-capacity flexible direct current transmission system and can solve most of fault over-voltage problems.
However, in a medium-and-low-voltage dc distribution network, the number of ports is large, and the difference of the port capacities is large, and in a network including 3 or more converter stations, when one main converter station is temporarily locked due to a fault, other port protection actions in a dc system should not be caused, but energy in the dc distribution network is forced to be rapidly redistributed, and the generated inrush current may trigger overcurrent protection of a high-voltage side port of a dc transformer with a small capacity.
Aiming at the inrush current phenomenon in a medium-low voltage direct current power distribution network, the current solution mainly depends on a mode of serially connecting a current-limiting reactor at a port of a direct current transformer to reduce the inrush current distributed to a small-capacity port, but the scheme depends on the design of overall parameters of a system in a planning stage, when the design is not perfect enough or actual engineering construction deviates from a design value, the inrush current and overcurrent phenomenon still frequently occurs, the inrush current suppression reliability is low, the power failure probability of equipment and the system is increased, and the power supply reliability is greatly reduced.
Disclosure of Invention
The embodiment of the application provides a device and a method for suppressing inrush current of a port of a direct current transformer, which are used for solving the technical problem of low reliability of suppressing inrush current of a medium-voltage and low-voltage direct current power distribution network in the prior art.
In order to solve the above technical problem, a first aspect of the present application provides a dc transformer port inrush current suppression device, including: a normally open branch and an inductance branch;
the normally-open branch includes: the fast isolating switch and the first switch component;
the second end of the fast isolating switch is connected in series with the first end of the first switch assembly, the first end of the fast isolating switch is used for being connected with a direct current line of a power distribution network, the second end of the first switch assembly is used for being connected in series with a first inductor, and the first inductor is an inductor which is connected in series at the inrush current input port of the direct current transformer;
and a second inductor is arranged in the inductor branch circuit, and the inductor branch circuit is connected with the normally open branch circuit in parallel.
Preferably, the method further comprises the following steps: a transition branch;
the transition branch is connected between the inductance branch and the normally-on branch in parallel;
the transition branch comprises: the first capacitor is connected with the second switch component in series.
Preferably, the method further comprises the following steps: an overvoltage protection branch;
an overvoltage protection element is arranged in the overvoltage protection branch;
the overvoltage protection branch circuit is connected with the inductance branch circuit in parallel.
Preferably, the first switch component is two IGBTs connected in series in an opposite direction.
Preferably, the second switch assembly is two IGBTs connected in series in an opposite direction.
Preferably, the overvoltage protection element is a lightning arrester.
Meanwhile, the second aspect of the present application further provides a method for suppressing dc transformer port inrush current, which is applied to a dc transformer port inrush current suppression device provided in the first aspect of the present application, and includes:
when detecting that a port of the converter station has a fault and needs emergency locking, switching off a first switch component in the normally-on branch so as to transfer the current flowing through the normally-on branch to the inductance branch;
and opening the quick isolating switch in the normally-on branch.
Preferably, when the dc transformer port inrush current suppression device further includes a transition branch, when detecting a converter station port fault and requiring emergency shutdown, turning off a first switch component in the normally-on branch, so as to transfer a current flowing through the normally-on branch to the inductance branch specifically includes:
and when the port fault of the converter station is detected and emergency locking is required, switching on the second switch component in the transition branch and switching off the first switch component in the normally-on branch so as to transfer the current flowing through the normally-on branch to the transition branch and then to transfer the current from the transition branch to the inductance branch.
Preferably, the first switch component is two IGBTs connected in series in an opposite direction.
Preferably, the second switch assembly is two IGBTs connected in series in an opposite direction.
According to the technical scheme, the embodiment of the application has the following advantages:
the inrush current suppression device that this application scheme provided is receiving behind the inrush current suppression start signal, normally open branch circuit switch module cuts off immediately, and the electric current shifts to the inductance branch circuit, breaks off normally open branch circuit isolator at last, finally makes the second inductance establish ties to the direct current transformer port, realizes the incremental adjustment of direct current transformer port inductance, plays the effect that the inrush current suppressed, has solved prior art and has suppressed the technical problem that the reliability is low to the inrush current of low pressure direct current distribution network.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic diagram of a multi-port DC distribution network and inrush current path;
FIG. 2 is an enlarged view of a portion a of FIG. 1;
FIG. 3 is an enlarged view of the structure of part b in FIG. 1;
FIG. 4 is a simplified equivalent circuit diagram of a multi-port DC power distribution network inrush current process;
fig. 5 is a schematic structural installation diagram of a dc transformer port inrush current suppression device provided in the present application;
fig. 6 is a control flowchart of the dc transformer port inrush current suppression device provided in the present application;
fig. 7 is a schematic flowchart of a method for suppressing inrush current at a dc transformer port according to the present disclosure.
Detailed Description
A multi-port dc distribution network is shown in fig. 1, assuming that in a normal state, converter stations 1, 2, and 3 output power to the converter stations through dc lines, the input power at the ports of a dc transformer is relatively small, when a converter station 4 is temporarily locked due to an ac side fault or a self fault and the current is rapidly reduced, because the control mode of each port converter cannot be transient in a short time, according to kirchhoff's current law, the current in the dc distribution network will be redistributed according to the current change rate of the locked ports to generate inrush current, and the circulation path thereof is shown by the thick line in fig. 1: because the change rate of the inrush current is very large, the inrush current in the converter station uniformly returns to the direct current side through the three bridge arms and cannot flow into the alternating current side, and the inrush current in the direct current transformer can only charge the voltage stabilizing capacitor through the freewheeling diode and cannot flow into the post-stage circuit due to the existence of the high-frequency isolation variable inductor.
The operating conditions in fig. 1 can be represented by a simplified equivalent circuit as shown in fig. 4 after ignoring the line impedance, as shown in the figure, the converter station 4 as the receiving station of the whole system can be equivalent to a forced current source because the emergency blocking current rapidly drops to zero or even reversely overshoots, and the current reduced by the current source needs to be shared by all the rest ports because of di4With a large/dt, the capacitance in the inrush current path at each port can be equivalently a short circuit, so that:
it can be seen that when the equivalent inductance of the port of the dc transformer is small, the converter station 4 is locked to the minimum current within the very short time, and the changing current Δ i4Larger, and the current-limiting inductance L is much smaller because the voltage class of the port of the dc transformer is the same as that of the converter station but the capacity is usually much smaller than that of the converter stationPETIs usually smaller than the equivalent inductance of the converter station port, so aiPETThe port overcurrent risk of the direct current transformer is larger, and only the port inductance L can be increasedPETIn a manner to reduce the inrush current distributed thereto.
The solution is very dependent on the accurate design of the whole parameters of the system by a designer in the planning stage, but the initial L is the speed and the stability of the regulation of the direct current transformer in normal operationPETThe design can not be too big, and the later stage increases the inductance also can be restricted to space and equipment whole encapsulation scheduling problem unable implementation moreover in actual engineering, consequently, when the design is not perfect enough or actual engineering construction has the deviation with the design value, the phenomenon of overflowing still frequently takes place, and the inrush current restraines the reliability low, increases the power failure probability of equipment and system, greatly reduced the power supply reliability.
The embodiment of the application provides a direct current transformer port inrush current suppression device for solve the technical problem that the inrush current suppression reliability of the medium-low voltage direct current distribution network in the prior art is low.
In order to make the objects, features and advantages of the present invention more apparent and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the embodiments described below are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 5, a dc transformer port inrush current suppression device according to the present application includes: a normally-on branch a1 and an inductive branch A3;
the normally-open branch a1 includes: the fast isolating switch and the first switch assembly;
the second end of the fast isolating switch is connected with the first end of the first switch assembly in series, the first end of the fast isolating switch is used for being connected with a direct current line of a power distribution network, and the second end of the first switch assembly is used for being connected with a first inductor in series, wherein the first inductor is an inductor which is connected at the inrush current input port of the direct current transformer in series;
a second inductor is disposed in the inductive branch A3, and the inductive branch A3 is connected in parallel with the normally-on branch a 1.
It should be noted that, in general, the ports of the converter stations in the dc power distribution network detect a fault, determine whether to block, and send a signal to the dc transformer to determine whether to start the inrush current suppression device, because only inrush currents at the ports of large capacity caused by blocking may cause overcurrent at the ports of the dc transformer in the power distribution network, and for the existing multi-port dc power distribution network, inrush current suppression needs to be started when the converter stations connected to the ac power distribution network are blocked. Before receiving an inrush current suppression starting signal, the current at the port of the direct current transformer mainly passes through a normally-on branch A1, and only when the current is stable and constant, part of the current is shunted to the inductorL PET1The rapidity of speed regulation under the normal working condition of the direct-current transformer cannot be influenced; and after receiving the inrush current suppression starting signal, the normally-on branch A1 switching component is immediately turned off, so that the current flowing through the normally-on branch A1 is transferred to the inductance branch A3, and finally the normally-on branch A3 is turned offBranch a1 isolator switch to finally implement the second inductorL PET1Is connected in series to the port of the DC transformer so as toL PET = L PET1 + L PET0(ii) a After the fault converter station is locked, the direct current side current of the fault converter station is rapidly reduced, the current of the rest ports is changed in the associated direction, and the rate of change of the port current is relative to that of the port current of the direct current transformer due to the fact that the serial inductance of the port of the direct current transformer is increasedL PET = L PET0The time is reduced, so far, the inrush current suppression device realizes the suppression effect, and the technical problem of low reliability of inrush current suppression of medium-low voltage direct current power distribution networks in the prior art is solved.
The above is a detailed description of an embodiment of a dc transformer port inrush current suppression device provided in the present application, and the following is a detailed description of another embodiment of a dc transformer port inrush current suppression device provided in the present application.
In some embodiments, the dc transformer port inrush current suppression device provided by the present application may further include, based on the content of the first embodiment, a step of: transition branch a 2.
The transition branch a2 is connected in parallel between the inductive branch A3 and the normally-on branch a 1.
The transition branch a2 includes: the first capacitor is connected with the second switch component in series.
It should be noted that when the inrush current suppression device includes the transition branch a2, the process of activating the inrush current suppression device involves current transfer in three branches: before starting, the switch components of the transition branch A2 are all turned off, the port current of the direct current transformer mainly passes through the normally-open branch A1, and only when the current is stable and constant, the current is partially shunted to the inductorL PET1The rapidity of speed regulation under the normal working condition of the direct-current transformer cannot be influenced; after receiving a starting signal, the switch component of the transition branch A2 is switched on, and the switch component of the normally-open branch A1 is switched off immediately, so that the current of the normally-open branch A1 can be transferred to the transition branch A2 only by less than 50 microseconds due to the current under the normal working condition, and the capacitance of the transition branch A2 is charged; by means of transition branchesThe voltage of the capacitor of the circuit A2 and the equivalent impedance increased in the turn-off process of the switch component, the current is transferred from the transition branch A2 to the inductance branch A3, and finally the normally-open branch A1 isolating switch is switched off, so that the inductance is finally realizedL PET1Is connected in series to a DC transformer port so thatL PET = L PET1 + L PET0(ii) a After the fault converter station is locked, the direct current side current of the fault converter station is rapidly reduced, the current of the rest ports is changed in the associated direction, and the rate of change of the port current is relative to that of the port current of the direct current transformer due to the fact that the serial inductance of the port of the direct current transformer is increasedL PET = L PET0The inrush current suppression device provided by the application only needs less than 50 microseconds to transfer current from the normally-open branch A1 to the transition branch A2, only needs about 200 microseconds to transfer current to the increased inductor by the transition branch A2, even if the transition branch is added, the actual time consumption of the second inductor access response action can be controlled within 1 millisecond and is lower than the time from the detection of the fault at a certain port to the judgment of the need of starting the locking, and the current transfer and the operation of increasing the inductor of the direct current transformer can be completed before the actual inrush current generation, the inrush current suppression capability of the direct current transformer is improved, and for a complete control flow example of the overall inrush current suppression device, reference may be specifically made to fig. 6.
Meanwhile, in the embodiment, the current is firstly transferred from the normally-open branch a1 to the transition branch a2 to charge the capacitance of the transition branch a2, and then the voltage of the capacitance of the transition branch a2 and the equivalent impedance increased in the switching-off process of the switch component of the transition branch a2 are used to transfer the current from the transition branch a2 to the inductance branch A3, so that the situation that the excessive inrush current directly flows into the inductance branch A3 to cause the damage of the second inductance can be avoided or reduced, and the effect of improving the safety of the inrush current suppression device is achieved while the execution efficiency of the inrush current suppression action is ensured.
More specifically, the first switch assembly is two IGBTs connected in series in an opposite direction, and the second switch assembly is two IGBTs connected in series in an opposite direction.
Further, the inrush current suppression device further includes: an overvoltage protection branch A4, the overvoltage protection branch A4 is arranged for preventing the inrush current suppression device from being overvoltage, and is used for ensuring that the device cannot generate overvoltage exceeding the tolerance of the device due to rapid current diversion;
an overvoltage protection element is arranged in the overvoltage protection branch A4;
the overvoltage protection branch a4 is connected in parallel with the inductive branch A3.
Further, the overvoltage protection element is an arrester.
The above is a detailed description of a second embodiment of the dc transformer port inrush current suppression device provided in the present application, and the following is a detailed description of an embodiment of a dc transformer port inrush current suppression method provided in the present application.
Referring to fig. 7 in conjunction with a control flow chart of a dc transformer port inrush current suppression device shown in fig. 6, a third embodiment of the present application provides a dc transformer port inrush current suppression method, which is applied to a dc transformer port inrush current suppression device provided in the first aspect of the present application, and includes:
step S1, when the converter station port failure is detected and emergency locking is needed, the first switch component in the normally-on branch is turned off so as to transfer the current flowing through the normally-on branch to the inductance branch;
and step S2, disconnecting the quick isolating switch in the normally-on branch.
Further, when the dc transformer port inrush current suppression device further includes a transition branch, the step S1 specifically includes:
and when the port fault of the converter station is detected and emergency locking is required, switching on the second switch component in the transition branch and switching off the first switch component in the normally-on branch so as to transfer the current flowing through the normally-on branch to the transition branch and then to transfer the current from the transition branch to the inductance branch.
Further, the first switch component is two reverse series connected IGBTs.
Further, the second switch component is two reverse series-connected IGBTs.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A DC transformer port inrush current suppression device, comprising: a normally-on branch and an inductance branch;
the normally-open branch includes: the fast isolating switch and the first switch component;
the second end of the fast isolating switch is connected in series with the first end of the first switch assembly, the first end of the fast isolating switch is used for being connected with a direct current line of a power distribution network, the second end of the first switch assembly is used for being connected in series with a first inductor, and the first inductor is an inductor which is connected in series at the inrush current input port of the direct current transformer;
and a second inductor is arranged in the inductor branch circuit, and the inductor branch circuit is connected with the normally open branch circuit in parallel.
2. The port inrush current suppression device for a dc transformer according to claim 1, further comprising: a transition branch;
the transition branch is connected between the inductance branch and the normally-on branch in parallel;
the transition branch comprises: the first capacitor is connected with the second switch component in series.
3. The port inrush current suppression device for a dc transformer according to claim 1, further comprising: an overvoltage protection branch;
an overvoltage protection element is arranged in the overvoltage protection branch;
the overvoltage protection branch circuit is connected with the inductance branch circuit in parallel.
4. The device of claim 1, wherein the first switching component is two IGBTs connected in series in an opposite direction.
5. The dc transformer port inrush current suppression device of claim 2, wherein the second switching component is two IGBTs connected in series in an opposite direction.
6. The device according to claim 3, wherein the overvoltage protection component is a lightning arrester.
7. A dc transformer port inrush current suppression method applied to the dc transformer port inrush current suppression device according to any one of claims 1 to 6, comprising:
when the port fault of the converter station is detected and emergency locking is required, a first switch component in the normally-on branch is turned off so as to transfer the current flowing through the normally-on branch to the inductance branch;
and opening the quick isolating switch in the normally-on branch.
8. The method according to claim 7, wherein when the dc transformer port inrush current suppression device further includes a transition branch, the turning off the first switch component in the normally-on branch when the converter station port failure is detected and emergency shutdown is required so as to transfer the current flowing through the normally-on branch to the inductance branch specifically includes:
and when the port fault of the converter station is detected and emergency locking is required, switching on the second switch component in the transition branch and switching off the first switch component in the normally-on branch so as to transfer the current flowing through the normally-on branch to the transition branch and then to transfer the current from the transition branch to the inductance branch.
9. The method for suppressing the port inrush current of the direct current transformer of claim 7, wherein the first switching component comprises two IGBTs connected in series in an opposite direction.
10. The method for suppressing the port inrush current of the direct current transformer as claimed in claim 8, wherein the second switching component is two IGBTs connected in series in an opposite direction.
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| CN202210643327.5A CN114725910A (en) | 2022-06-09 | 2022-06-09 | Device and method for suppressing inrush current of port of direct-current transformer |
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| CN202210643327.5A CN114725910A (en) | 2022-06-09 | 2022-06-09 | Device and method for suppressing inrush current of port of direct-current transformer |
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