CN216774634U - Bidirectional high-voltage direct-current device and test equipment - Google Patents
Bidirectional high-voltage direct-current device and test equipment Download PDFInfo
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Abstract
The application discloses two-way high voltage dc device and test equipment, its two-way high voltage dc device includes: the bidirectional DC/DC converter, the bidirectional isolating DC/DC converter, the bidirectional non-isolating DC/DC converter, the alternating current module and the direct current module are sequentially connected; the bidirectional high-voltage direct-current device provided by the application does not need to be externally connected with a bidirectional AC/DC converter and a DC/DC converter, and the effect of simple wiring is achieved; and through the switching of two-way high voltage direct current device between first mode and second mode, provide two-way alternating current-direct current conversion function to be provided with two-way isolation DC/DC converter, two-way non-isolation DC/DC converter, reach advantages such as high efficiency, high reliability, compatibility are strong.
Description
Technical Field
The application relates to the technical field of power electronic converters, in particular to a bidirectional high-voltage direct-current device and test equipment.
Background
The high-voltage direct-current load and the alternating-current load which are needed by a bidirectional high-voltage direct-current product during aging need to be simultaneously subjected to an alternating-current source and a direct-current source, so that aging tests of the product in different modes are realized, and the technical difficulties of multiple equipment requirements, complex wiring, difficult software control logic, incapability of processing abnormity and the like need to be solved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a bidirectional high-voltage direct-current device and test equipment, and solves the problem that the existing bidirectional high-voltage direct-current product is complex in wiring.
The embodiment of the application provides a two-way high voltage dc device, includes:
a bidirectional AC/DC converter, a bidirectional isolation DC/DC converter and a bidirectional non-isolation DC/DC converter;
the bidirectional high-voltage direct-current device also comprises an alternating-current module and a direct-current module;
the alternating current module is arranged at an AC side outlet of the bidirectional high-voltage direct current device, and the direct current module is arranged at a DC side outlet of the bidirectional high-voltage direct current device;
the alternating current module, the bidirectional AC/DC converter, the bidirectional isolation DC/DC converter, the bidirectional non-isolation DC/DC converter and the direct current module are sequentially connected;
the bidirectional high-voltage direct-current device comprises a first working mode and a second working mode, when the bidirectional high-voltage direct-current device is in the first working mode, an alternating-current power supply sequentially flows through the alternating-current module, the bidirectional AC/DC converter, the bidirectional isolation DC/DC converter, the bidirectional non-isolation DC/DC converter and the direct-current module and then outputs high-voltage direct current through a DC side outlet of the bidirectional high-voltage direct-current device, and when the bidirectional high-voltage direct-current device is in the second working mode, a direct-current power supply sequentially flows through the direct-current module, the bidirectional non-isolation DC/DC converter, the bidirectional AC/DC converter and the alternating-current module and then outputs alternating-current voltage through an AC side outlet of the bidirectional high-voltage direct-current device.
Optionally, in some embodiments of the present application, the bidirectional high-voltage direct-current device further includes a control unit;
the control unit is arranged between the direct current module and a DC side outlet of the bidirectional high-voltage direct current device, and the control unit is arranged for switching the working mode of the bidirectional high-voltage direct current device.
Optionally, in some embodiments of the present application, the control unit includes a diode and a switching circuit connected in parallel;
when the switch circuit is conducted, the diode is cut off, and the bidirectional high-voltage direct-current device is controlled to be in the second working mode;
when the switch circuit is cut off, the diode is conducted to control the bidirectional high-voltage direct-current device to be in the first working mode.
Optionally, in some embodiments of the present application, the bidirectional high-voltage dc device further comprises a capacitor;
one end of the capacitor is connected with a first alternating current input end of the alternating current module, and the other end of the capacitor is connected with a DC side of the bidirectional AC/DC converter.
Optionally, in some embodiments of the present application, the bidirectional AC/DC converter includes a first bidirectional AC/DC converter and a second bidirectional AC/DC converter;
the bidirectional isolation DC/DC converter comprises a first bidirectional isolation DC/DC converter and a second bidirectional isolation DC/DC converter;
the bidirectional non-isolated DC/DC converter comprises a first bidirectional non-isolated DC/DC converter and a second bidirectional non-isolated DC/DC converter;
the capacitor includes a first capacitor and a second capacitor.
Optionally, in some embodiments of the present application, the first bidirectional AC/DC converter is connected in parallel with the second bidirectional AC/DC converter and then connected to the first bidirectional isolated DC/DC converter and the second bidirectional isolated DC/DC converter respectively;
the first bidirectional isolation DC/DC converter is connected with the first bidirectional non-isolation DC/DC converter in series, and the second bidirectional isolation DC/DC converter is connected with the second bidirectional non-isolation DC/DC converter in series;
and the first bidirectional non-isolated DC/DC converter and the second bidirectional non-isolated DC/DC converter are connected in parallel and then are connected with the direct current module.
Optionally, in some embodiments of the present application, one end of the first capacitor is connected to the DC-side positive electrode of the first bidirectional AC/DC converter, and the other end of the second capacitor is connected to the DC-side negative electrode of the second bidirectional AC/DC converter;
and the other end of the first capacitor is connected with one end of the second capacitor in parallel and then is connected with the alternating current module.
Correspondingly, this application embodiment still provides a test equipment of two-way high voltage dc device, includes:
the system comprises a control terminal and at least two bidirectional high-voltage direct-current devices which are in communication connection;
the AC side outlets corresponding to the two-way high-voltage direct-current devices are respectively connected to an alternating current power grid;
and the control terminal performs aging test on each bidirectional high-voltage direct-current device by controlling the respective corresponding working mode of each bidirectional high-voltage direct-current device.
Optionally, in some embodiments of the present application, the DC side outlets of every two bidirectional high-voltage direct-current devices are connected, the AC side outlets of every two bidirectional high-voltage direct-current devices are connected, and an alternating-current/direct-current power supply loop is formed between every two bidirectional high-voltage direct-current devices, so as to implement alternating-current/direct-current power supply between each two bidirectional high-voltage direct-current devices.
Optionally, in some embodiments of the present application, the testing apparatus of the bidirectional high-voltage direct-current device further includes a PLC module;
the PLC modules are respectively connected with the two-way high-voltage direct-current devices, and the PLC modules are arranged for disconnecting the first two-way high-voltage direct-current device in every two-way high-voltage direct-current devices from the alternating-current power grid.
The bidirectional high-voltage direct-current device provided by the embodiment of the application is integrated with a bidirectional AC/DC converter, a bidirectional isolation DC/DC converter, a bidirectional non-isolation DC/DC converter, an alternating current module and a direct current module, does not need to be externally connected with the bidirectional AC/DC converter and the DC/DC converter, and achieves the effect of simple wiring; and through the switching of two-way high voltage direct current device between first mode and second mode, provide two-way alternating current-direct current conversion function to be provided with two-way isolation DC/DC converter, two-way non-isolation DC/DC converter, reach advantages such as high efficiency, high reliability, compatibility are strong.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of a bidirectional HVDC apparatus provided by an embodiment of the present application;
FIG. 2 is a schematic structural diagram of another embodiment of a bidirectional HVDC device provided in an embodiment of the present application;
fig. 3 is a schematic current flow diagram of a bidirectional hvdc device provided in an embodiment of the present application in a first operation mode;
fig. 4 is a schematic current flow diagram of a bidirectional hvdc device provided by an embodiment of the present application in a second operation mode;
FIG. 5 is a schematic structural diagram of an embodiment of a testing apparatus for a bi-directional HVDC device provided in an embodiment of the present application;
fig. 6 is a schematic current flow diagram of ac/dc power supply in test equipment of a bidirectional high-voltage dc device according to an embodiment of the present disclosure.
Description of reference numerals:
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments 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. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless indicated to the contrary, the use of the directional terms "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, and more particularly to the orientation of the figures of the drawings; while "inner" and "outer" are with respect to the outline of the device.
The embodiment of the application provides a bidirectional high-voltage direct-current device and test equipment. The following are detailed descriptions. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
The first embodiment,
The embodiment of the present application provides a bidirectional high-voltage direct-current device, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the bidirectional high-voltage direct-current device provided in the embodiment of the present application, and the device includes a bidirectional AC/DC converter 101, a bidirectional isolated DC/DC converter 102, a bidirectional non-isolated DC/DC converter 103, an alternating current module 104, and a direct current module 105. The alternating current module 104 is arranged at an outlet of an AC side of the bidirectional high-voltage direct current device, the direct current module 105 is arranged at an outlet of a DC side of the bidirectional high-voltage direct current device, and the alternating current module 104, the bidirectional AC/DC converter 101, the bidirectional isolation DC/DC converter 102, the bidirectional non-isolation DC/DC converter 103 and the direct current module 105 are sequentially connected.
In some embodiments of the present application, the bi-directional high voltage DC device further comprises a capacitor 106, one end of the capacitor 106 is connected to the first AC input terminal of the AC module 104, and the other end of the capacitor 106 is connected to the DC side of the bi-directional AC/DC converter 101. In some embodiments of the present application, the other end of the capacitor 106 is connected to the DC side positive electrode of the bidirectional AC/DC converter 101; in some embodiments of the present application, the other end of the capacitor 106 is connected to the negative DC side of the bi-directional AC/DC converter 101. In some embodiments of the present application, the capacitor 106 may be used to store electrical energy.
The bidirectional high-voltage direct-current device is provided with a first working mode and a second working mode, when the bidirectional high-voltage direct-current device is in the first working mode, an alternating-current power supply sequentially flows through the alternating-current module 104, the bidirectional AC/DC converter 101, the bidirectional isolation DC/DC converter 102, the bidirectional non-isolation DC/DC converter 103 and the direct-current module 105 and then outputs high-voltage direct current through a DC side outlet of the bidirectional high-voltage direct-current device, and when the bidirectional high-voltage direct-current device is in the second working mode, the direct-current power supply sequentially flows through the direct-current module 105, the bidirectional non-isolation DC/DC converter 103, the bidirectional isolation DC/DC converter 102, the bidirectional AC/DC converter 101 and the alternating-current module 104 and then outputs alternating-current voltage through an AC side outlet of the bidirectional high-voltage direct-current device.
In some embodiments, the bidirectional non-isolated DC/DC converter 103 may be a single-phase or multi-phase synchronous rectification Cuk converter, or may be a synchronous rectification Boost converter; the bidirectional isolation DC/DC converter 102 may be an LLC resonant converter, or may be a CLLC resonant converter; the bidirectional AC/DC converter 101 may be H-type, T-type, or the like. In some embodiments of the present application, the bidirectional AC/DC converter 101 may employ an H-bridge type inverter, and the control unit 107 includes a sampling circuit and Digital Signal Processing (DSP) digital control; the bidirectional non-isolated DC/DC converter 103 may be a cross-parallel Cuk converter, which has bidirectional operation capability, a forward input end has a filter inductor, the bidirectional high voltage DC device operates in a first operation mode, and the bidirectional non-isolated DC/DC converter 103 is used as an electronic load, or the bidirectional high voltage DC device operates in a second operation mode, and has a higher requirement on current ripple, and at this time, the bidirectional non-isolated DC/DC converter 103 can realize higher input current ripple control; the bidirectional isolation DC/DC converter 102 may employ an LLC resonant topology to undertake high frequency isolation for efficient energy transfer.
The bidirectional high-voltage direct-current device provided by the embodiment of the application is integrated with the bidirectional AC/DC converter 101, the bidirectional isolation DC/DC converter 102, the bidirectional non-isolation DC/DC converter 103, the alternating current module 104 and the direct current module 105, the bidirectional alternating current-direct current conversion function is provided by switching the bidirectional high-voltage direct-current device between the first working mode and the second working mode, the bidirectional isolation DC/DC converter 102 and the bidirectional non-isolation DC/DC converter 103 are arranged, and the advantages of high efficiency, high reliability, strong compatibility and the like are achieved.
In some embodiments of the present application, as shown in fig. 1, the bi-directional high voltage dc device further comprises a control unit 107; the control unit 107 is arranged between the direct current module 105 and the DC side outlet of the bi-directional high voltage direct current device, the control unit 107 being arranged to switch the operation mode of the bi-directional high voltage direct current device. As shown in fig. 1, the control unit 107 includes a diode D and a switch circuit S connected in parallel, an anode of the diode D is connected to the DC module 105, and a cathode of the diode D is connected to an anode of the DC power supply through a DC side outlet of the bi-directional high voltage DC device. According to the one-way conduction characteristic of the diode D, when the switch circuit S is conducted, the diode D is cut off, the two-way high-voltage direct-current device is in the second working mode, and the direct-current power supply sequentially flows through the direct-current module 105, the two-way non-isolated DC/DC converter 103, the two-way isolated DC/DC converter 102, the two-way AC/DC converter 101 and the alternating-current module 104 and then outputs alternating-current voltage through an AC side outlet of the two-way high-voltage direct-current device; when the switching circuit S is turned off, the diode D is turned on, the bidirectional high-voltage direct-current device is in the first operating mode, and the alternating-current power supply sequentially flows through the alternating-current module 104, the bidirectional AC/DC converter 101, the bidirectional isolated DC/DC converter 102, the bidirectional non-isolated DC/DC converter 103, and the direct-current module 105 and then outputs high-voltage direct current through a DC side outlet of the bidirectional high-voltage direct-current device.
The bidirectional high-voltage direct-current device provided by the embodiment of the application controls the bidirectional high-voltage direct-current device to be switched between the first working mode and the second working mode through the control unit 107, and provides a bidirectional alternating-current/direct-current conversion function.
Example II,
In some embodiments of the present application, as shown in fig. 2, fig. 2 is a schematic structural diagram of another embodiment of a bidirectional high-voltage direct-current device provided by an embodiment of the present application, where a bidirectional AC/DC converter 101 includes a first bidirectional AC/DC converter 1011 and a second bidirectional AC/DC converter 1012, a bidirectional isolated DC/DC converter 102 includes a first bidirectional isolated DC/DC converter 1021 and a second bidirectional isolated DC/DC converter 1022, a bidirectional non-isolated DC/DC converter 103 includes a first bidirectional non-isolated DC/DC converter 1031 and a second bidirectional non-isolated DC/DC converter 1032, and a capacitor 106 includes a first capacitor 1061 and a second capacitor 1062.
The first bidirectional AC/DC converter 1011 and the second bidirectional AC/DC converter 1012 are connected in parallel and then connected to the first bidirectional isolation DC/DC converter 1021 and the second bidirectional isolation DC/DC converter 1022 respectively, the first bidirectional isolation DC/DC converter 1021 is connected in series to the first bidirectional non-isolation DC/DC converter 1031, the second bidirectional isolation DC/DC converter 1022 is connected in series to the second bidirectional non-isolation DC/DC converter 1032, and the first bidirectional non-isolation DC/DC converter 1031 and the second bidirectional non-isolation DC/DC converter 1032 are connected in parallel and then connected to the direct current module 105.
Specifically, as shown in fig. 2, a DC-side positive electrode of the first bidirectional AC/DC converter 1011 is connected in parallel with a DC-side positive electrode of the second bidirectional AC/DC converter 1012 and then connected to a first bidirectional isolated DC-side positive electrode corresponding to each of the first bidirectional isolated DC/DC converter 1021 and the second bidirectional isolated DC/DC converter 1022; the negative pole of the DC side of the first bidirectional AC/DC converter 1011 is connected in parallel with the negative pole of the DC side of the second bidirectional AC/DC converter 1012 and then is respectively connected with the negative poles of the first bidirectional isolation DC sides corresponding to the first bidirectional isolation DC/DC converter 1021 and the second bidirectional isolation DC/DC converter 1022; a second bidirectional isolation DC-side positive electrode and a second bidirectional isolation DC-side negative electrode of the first bidirectional isolation DC/DC converter 1021 are respectively connected with a first bidirectional DC-side positive electrode and a first bidirectional DC-side inlet negative electrode of the first bidirectional non-isolation DC/DC converter 1031; the second bidirectional isolated DC-side positive electrode and the second bidirectional isolated DC-side negative electrode of the second bidirectional isolated DC/DC converter 1022 are connected to the first bidirectional DC-side positive electrode and the first bidirectional DC-side negative electrode of the second bidirectional non-isolated DC/DC converter 1032, respectively; a second bidirectional DC side positive electrode of the first bidirectional non-isolated DC/DC converter 1031 is connected in parallel with a second bidirectional DC side positive electrode of the second bidirectional non-isolated DC/DC converter 1032 and then connected to one end positive electrode of the direct current module 105, and a second bidirectional DC side negative electrode of the first bidirectional non-isolated DC/DC converter 1031 is connected in parallel with a second bidirectional DC side negative electrode of the second bidirectional non-isolated DC/DC converter 1032 and then connected to one end negative electrode of the direct current module 105; the other end of the dc module 105 has a positive electrode connected to a positive electrode of a dc power supply via the control unit 107, and the other end of the dc module 105 has a negative electrode connected to a negative electrode of the dc power supply.
As shown in fig. 2, one end of a first capacitor 1061 is connected to the positive pole of the DC side of the first bidirectional AC/DC converter 1011, the other ends of the first capacitor 1061 are connected to one end of a second capacitor and the first AC input terminal of the AC module 104, one end of a second capacitor 1062 is connected to the other end of the first capacitor 1061 and the first AC input terminal of the AC module 104, and the other end of the second capacitor 1062 is connected to the negative pole of the DC side of the second bidirectional AC/DC converter 1012.
As shown in fig. 2, the second ac input terminal of the ac module 104 is connected to a three-phase ac power source, and the first ac input terminal of the ac module 104 includes three ac branches: the circuit comprises a first alternating current branch, a second alternating current branch and a third alternating current branch, wherein the first alternating current branch is connected with the positive pole of the AC side of the first bidirectional AC/DC converter 1011, the second alternating current branch is respectively connected with the negative pole of the AC side of the first bidirectional AC/DC converter 1011, the positive pole of the AC side of the second bidirectional AC/DC converter 1012, the other end of the first capacitor 1061 and one end of the second capacitor 1062, and the third alternating current branch is connected with the negative pole of the AC side of the second bidirectional AC/DC converter 1012.
Fig. 3 is a schematic diagram (shown by an arrow in fig. 3) illustrating a current flowing direction of the bidirectional hvdc device in the first operation mode according to the present invention, and as shown in fig. 3, when the bidirectional hvdc device in the first operation mode is provided, the switch circuit S in the control unit 107 is turned off, the diode D is turned on, the three-phase AC power source is connected to the second AC input terminal of the AC module 104, the three-phase AC power source flows into the AC module 104, and the first AC input terminal of the AC module 104 outputs three AC branches, wherein the first AC branch and the third AC branch respectively flow into the AC-side positive pole of the first bidirectional AC/DC converter 1011 and the AC-side negative pole of the second bidirectional AC/DC converter 1012, and the second AC branch respectively flows into the AC-side negative pole of the first bidirectional AC/DC converter 1011, the AC-side positive pole of the second bidirectional AC/DC converter 1012, the DC-side positive pole of the second bidirectional AC/DC converter 1012, A first capacitor 1061 and a second capacitor 1062; the first bidirectional AC/DC converter 1011 and the second bidirectional AC/DC converter 1012 respectively perform AC/DC conversion on the received AC current, and then output DC current through the DC sides corresponding to the first bidirectional AC/DC converter 1011 and the second bidirectional AC/DC converter 1012; after the DC current output by the DC side positive pole corresponding to each of the first bidirectional AC/DC converter 1011 and the second bidirectional AC/DC converter 1012 turns, the DC current respectively flows into the positive pole of the first bidirectional isolated DC side corresponding to each of the first bidirectional isolated DC/DC converter 1021 and the second bidirectional isolated DC/DC converter 1022, and after the DC current output by the DC side negative pole corresponding to each of the first bidirectional AC/DC converter 1011 and the second bidirectional isolated DC/DC converter 1012 turns, the DC current respectively flows into the negative pole of the first bidirectional isolated DC side corresponding to each of the first bidirectional isolated DC/DC converter 1021 and the second bidirectional isolated DC/DC converter 1022; after the voltage of the received direct current is adjusted by the first bidirectional isolation DC/DC converter 1021 and the second bidirectional isolation DC/DC converter 1022, the voltage-adjusted direct current is output through the second bidirectional isolation DC side corresponding to the first bidirectional isolation DC/DC converter 1021 and the second bidirectional isolation DC/DC converter 1022, respectively; the regulated direct currents output from the second bidirectional isolated DC sides corresponding to the first bidirectional isolated DC/DC converter 1021 and the second bidirectional isolated DC/DC converter 1022 respectively flow into the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032; the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032 convert the adjusted DC current flowing into the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032 respectively, and then output the converted DC current through the second bidirectional DC side corresponding to each of the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032; the converted direct currents output by the second bidirectional DC side anodes corresponding to the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032 are merged and flow into the one end anode of the direct current module 105, and the converted direct currents output by the second bidirectional DC side cathodes corresponding to the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032 are merged and flow into the one end cathode of the direct current module 105; the other end of the dc module 105 outputs the final dc current.
As shown in fig. 4, fig. 4 is a schematic current flow diagram (indicated by an arrow in fig. 4) of the bidirectional high-voltage direct-current device provided in the embodiment of the present application in the second operation mode, and as shown in fig. 4, when the bidirectional high-voltage direct-current device is in the first operation mode, the switching circuit S in the control unit 107 is turned on, and the diode D is turned off; the positive electrode at the other end of the direct current module 105 is connected with the positive electrode of a direct current power supply through the control unit 107, the negative electrode at the other end of the direct current module 105 is connected with the negative electrode of the direct current power supply, and current in the direct current power supply flows into the direct current module 105; direct currents output by the positive pole at one end of the direct current module 105 respectively flow into the positive poles on the second bidirectional DC sides corresponding to the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032, and direct currents output by the negative pole at one end of the direct current module 105 respectively flow into the negative poles on the second bidirectional DC sides corresponding to the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032; the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032 convert the accessed direct current, and then output the converted direct current through the first bidirectional DC sides corresponding to the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032, respectively; the converted direct currents output from the first bidirectional DC sides corresponding to the first bidirectional non-isolated DC/DC converter 1031 and the second bidirectional non-isolated DC/DC converter 1032 respectively flow into the second bidirectional isolated DC sides corresponding to the first bidirectional isolated DC/DC converter 1021 and the second bidirectional isolated DC/DC converter 1022 respectively; after the voltage of the DC current after the conversion flowing into the first bidirectional isolation DC/DC converter 1021 and the second bidirectional isolation DC/DC converter 1022 is adjusted, the DC current after the voltage adjustment is output through the first bidirectional isolation DC side corresponding to each of the first bidirectional isolation DC/DC converter 1021 and the second bidirectional isolation DC/DC converter 1022; the direct current after voltage adjustment output by the positive pole of the first bidirectional isolation DC side corresponding to the first bidirectional isolation DC/DC converter 1021 and the second bidirectional isolation DC/DC converter 1022 are merged and then respectively flow into the positive pole of the DC side corresponding to the first bidirectional AC/DC converter 1011 and the second bidirectional AC/DC converter 1012, and the direct current after voltage adjustment output by the negative pole of the first bidirectional isolation DC side corresponding to the first bidirectional isolation DC/DC converter 1021 and the second bidirectional isolation DC/DC converter 1022 are merged and respectively flow into the negative pole of the DC side corresponding to the first bidirectional AC/DC converter 1011 and the second bidirectional AC/DC converter 1012; the first bidirectional AC/DC converter 1011 and the second bidirectional AC/DC converter 1012 AC-DC convert the DC current with the regulated voltage flowing therein, and output AC current through AC sides corresponding to the first bidirectional AC/DC converter 1011 and the second bidirectional AC/DC converter 1012, respectively; alternating current output by the AC side positive electrode of the first bidirectional AC/DC converter 1011 flows into the alternating current module 104 through the first alternating current branch, alternating current output by the AC side negative electrode of the second bidirectional AC/DC converter 1012 flows into the alternating current module 104 through the third alternating current branch, and alternating current output by the AC side negative electrode of the first bidirectional AC/DC converter 1011, alternating current output by the AC side positive electrode of the second bidirectional AC/DC converter 1012, and output currents of the first capacitor 1061 and the second capacitor 1062 are merged and then flow into the alternating current module 104 through the second alternating current branch; a second ac input of the ac module 104 outputs a three-phase ac current.
The bidirectional high-voltage direct current device provided by the embodiment of the application is integrated with the bidirectional AC/DC converter, the bidirectional isolation DC/DC converter, the bidirectional non-isolation DC/DC converter, the alternating current module 104 and the direct current module 105, the bidirectional alternating current-direct current conversion function is provided by switching the bidirectional high-voltage direct current device between the first working mode and the second working mode, the bidirectional isolation DC/DC converter and the bidirectional non-isolation DC/DC converter are arranged, and the advantages of high efficiency, high reliability, strong compatibility and the like are achieved.
Example III,
The embodiment of the present application further provides a testing apparatus for a bidirectional high-voltage direct-current device, where the testing apparatus for a bidirectional high-voltage direct-current device includes a control terminal and at least two bidirectional high-voltage direct-current devices described in the above embodiments, the two bidirectional high-voltage direct-current devices are in communication connection with the control terminal, the AC side outlets corresponding to the two bidirectional high-voltage direct-current devices are respectively connected to an AC power grid, and the control terminal performs an aging test on the two bidirectional high-voltage direct-current devices by controlling the respective corresponding operating modes of the two bidirectional high-voltage direct-current devices.
In detail, as shown in fig. 5, fig. 5 is a schematic structural diagram of an embodiment of a testing apparatus for a bidirectional high-voltage direct-current device provided in the embodiment of the present application, where the testing apparatus for a bidirectional high-voltage direct-current device is used for performing an aging test on the bidirectional high-voltage direct-current device provided in the embodiment of the present application. The structure of the testing equipment for the bidirectional high-voltage direct-current device is described by taking two bidirectional high-voltage direct-current devices described in the above embodiments as an example, and of course, the number of the bidirectional high-voltage direct-current devices in the testing equipment for the bidirectional high-voltage direct-current device provided in the embodiments of the present application may be at least two, where at least two refer to two or more even numbers, and therefore, the specific number of the bidirectional high-voltage direct-current devices in the testing equipment for the bidirectional high-voltage direct-current device in the embodiments of the present application does not limit the protection scope of the embodiments of the present application.
As shown in fig. 5, the testing apparatus for a bi-directional high voltage dc device includes: control terminal 501, first bidirectional HVDC device AD01 and second bidirectional HVDC device AD02, wherein first bidirectional HVDC device AD01 and second bidirectional HVDC device AD02 are respectively connected with control terminal 501 in communication. The AC side outlets of the first bidirectional high-voltage direct-current device AD01 and the second bidirectional high-voltage direct-current device AD02, which correspond to each other, are respectively connected to an AC power grid, and the control terminal 501 performs an aging test on the first bidirectional high-voltage direct-current device AD01 and the second bidirectional high-voltage direct-current device AD02 by controlling the respective corresponding operating modes of the first bidirectional high-voltage direct-current device AD01 and the second bidirectional high-voltage direct-current device AD 02.
In some embodiments of the present application, the DC side outlets corresponding to each two bidirectional high-voltage direct-current devices are connected, the AC side outlets corresponding to each two bidirectional high-voltage direct-current devices are connected, and an AC/DC power supply loop is formed between each two bidirectional high-voltage direct-current devices, so as to implement AC/DC power supply between each two bidirectional high-voltage direct-current devices.
As shown in fig. 5, the DC side outlets of the first bidirectional high-voltage direct-current device AD01 and the second bidirectional high-voltage direct-current device AD02 are connected, and the AC side outlets of the first bidirectional high-voltage direct-current device AD01 and the second bidirectional high-voltage direct-current device AD02 are connected, that is, the DC side outlet of the first bidirectional high-voltage direct-current device AD01 is connected to the DC side outlet of the second bidirectional high-voltage direct-current device AD02, the AC side outlet of the first bidirectional high-voltage direct-current device AD01 is connected to the AC side outlet of the second bidirectional high-voltage direct-current device AD02, and an AC/DC power supply loop is formed between the first bidirectional high-voltage direct-current device AD01 and the second bidirectional high-voltage direct-current device AD02, so as to implement AC/DC power supply between each other devices.
In some embodiments of the present application, an ac/dc power supply circuit is formed between the first bidirectional high-voltage dc device AD01 and the second bidirectional high-voltage dc device AD02, and an ac load and a dc load do not need to be separately connected, so as to achieve the purposes of simple wiring and fast line switching.
In some embodiments of the present application, the testing apparatus for bi-directional hvdc devices further comprises a PLC (Programmable Logic Controller) module 502, the PLC module 502 is connected to each bi-directional hvdc device, and the PLC module 502 is configured to disconnect one bi-directional hvdc device of every two bi-directional hvdc devices from the ac power grid.
In detail, as shown in fig. 5, the PLC module 502 is connected to the first bi-directional high voltage dc device AD01 and the second bi-directional high voltage dc device AD02, respectively, and the PLC module 502 is configured to disconnect the first bi-directional high voltage dc device AD01 or the second bi-directional high voltage dc device AD02 from the ac power grid.
In some embodiments of the present application, the PLC module 502 may further be connected to the control terminal 501, and disconnect the first bi-directional high voltage dc device AD01 or the second bi-directional high voltage dc device AD02 from the ac power grid according to an instruction of the control terminal 501.
In some embodiments of the present application, an operation mode of the first bi-directional high voltage dc device AD01 is different from an operation mode of the second bi-directional high voltage dc device AD02, for example, when the operation mode of the first bi-directional high voltage dc device AD01 is the first operation mode, the second bi-directional high voltage dc device AD02 operates in the second operation mode.
In some embodiments of the present application, the testing apparatus for a bi-directional hvdc device is further provided with a clock circuit (not shown) for recording the operation duration of the first bi-directional hvdc device AD01 and the first bi-directional hvdc device AD01 in the corresponding operation mode, when the operation time reaches a preset time, the operation modes of the first bidirectional high-voltage direct-current device AD01 and the first bidirectional high-voltage direct-current device AD01 are switched, for example, when the operation mode of the first bidirectional high-voltage direct-current device AD01 is the first operation mode, the second bidirectional high-voltage direct-current device AD02 operates in the second operation mode, the operation time duration of the first bidirectional high-voltage direct-current device AD01 and the operation time duration of the first bidirectional high-voltage direct-current device AD01 in the corresponding operation modes are recorded, when the operation time reaches a preset time, the working mode of the first bidirectional high-voltage direct-current device AD01 is switched to a second working mode, and the working mode of the second bidirectional high-voltage direct-current device AD02 is switched to the first working mode.
The test equipment of the bidirectional high-voltage direct-current device provided by the embodiment of the application does not need to be connected with an alternating-current load and a direct-current load independently, and the purposes of simple wiring and quick line change are achieved; and in the work of the test equipment of the two-way high-voltage direct-current devices, the first two-way high-voltage direct-current device AD01 of the two-way high-voltage direct-current devices provides a direct-current power supply for the second two-way high-voltage direct-current device AD02, and the second two-way high-voltage direct-current device AD02 provides an alternating-current power supply for the second two-way high-voltage direct-current device AD02, so that the use of an external alternating-current power supply is reduced, the energy consumption is reduced, and meanwhile, the two-way high-voltage direct-current devices are subjected to aging test, and the test efficiency is improved.
As shown in fig. 6, fig. 6 is a schematic current flow direction diagram (current flow direction is indicated by an arrow in fig. 6) of ac/DC power supply in testing equipment of a bidirectional hvdc device provided in this embodiment, which is exemplified by that a first bidirectional hvdc device AD01 in the testing equipment of the bidirectional hvdc device operates in a first operation mode, and a second bidirectional hvdc device AD02 in the testing equipment of the bidirectional hvdc device operates in a second operation mode, a PLC module 502 disconnects a second bidirectional hvdc device AD02 from an ac grid, the first bidirectional hvdc device AD01 is connected to the ac grid, converts an incoming ac current into a DC current, outputs the DC current through a DC side outlet of a first bidirectional hvdc device AD01, and the DC current flows into a second bidirectional hvdc device AD02 through a DC side outlet of a bidirectional hvdc device AD02 to perform DC-ac conversion, alternating current is output through an AC side outlet of the second bidirectional high-voltage direct current device AD02, and the alternating current flows into the first bidirectional high-voltage direct current device AD01 through an AC side outlet of the first bidirectional high-voltage direct current device for alternating current-to-direct current conversion.
The test equipment of two-way high voltage dc device that this application embodiment provided, through per two-way high voltage dc device of parallelly connected, form an alternating current-direct current power supply return circuit between per two-way high voltage dc device, realize mutual alternating current-direct current power supply, first two-way high voltage dc device AD01 among per two-way high voltage dc device directly utilizes the alternating current after second two-way high voltage dc device AD02 conversion to carry out the AC-direct current conversion, and direct current after will converting transmits to second two-way high voltage dc device AD02 and carries out the AC-direct current conversion, reduce external AC power supply's use, reduce the energy consumption, and carry out aging test to two-way high voltage dc device simultaneously, improve efficiency of software testing.
The foregoing detailed description is directed to a bidirectional high-voltage direct-current device and a test apparatus provided in the embodiments of the present application, and specific examples are applied in the detailed description to explain the principles and implementations of the present application, and the description of the foregoing embodiments is only used to help understand the method and the core ideas of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A bi-directional high voltage DC device comprising a bi-directional AC/DC converter, a bi-directional isolated DC/DC converter and a bi-directional non-isolated DC/DC converter, characterized in that:
the bidirectional high-voltage direct-current device further comprises an alternating-current module and a direct-current module;
the alternating current module is arranged at an AC side outlet of the bidirectional high-voltage direct current device, and the direct current module is arranged at a DC side outlet of the bidirectional high-voltage direct current device;
the alternating current module, the bidirectional AC/DC converter, the bidirectional isolation DC/DC converter, the bidirectional non-isolation DC/DC converter and the direct current module are sequentially connected;
the bidirectional high-voltage direct-current device comprises a first working mode and a second working mode, when the bidirectional high-voltage direct-current device is in the first working mode, an alternating-current power supply sequentially flows through the alternating-current module, the bidirectional AC/DC converter, the bidirectional isolation DC/DC converter, the bidirectional non-isolation DC/DC converter and the direct-current module and then outputs high-voltage direct current through a DC side outlet of the bidirectional high-voltage direct-current device, and when the bidirectional high-voltage direct-current device is in the second working mode, a direct-current power supply sequentially flows through the direct-current module, the bidirectional non-isolation DC/DC converter, the bidirectional AC/DC converter and the alternating-current module and then outputs alternating-current voltage through an AC side outlet of the bidirectional high-voltage direct-current device.
2. The device of claim 1, further comprising a control unit;
the control unit is arranged between the direct current module and a DC side outlet of the bidirectional high-voltage direct current device, and the control unit is arranged for switching the working mode of the bidirectional high-voltage direct current device.
3. The bi-directional high voltage direct current device according to claim 2, characterized in that the control unit comprises a diode and a switching circuit in parallel;
when the switch circuit is conducted, the diode is cut off, and the bidirectional high-voltage direct-current device is controlled to be in the second working mode;
when the switch circuit is cut off, the diode is conducted to control the bidirectional high-voltage direct-current device to be in the first working mode.
4. A bi-directional high voltage direct current device according to any of claims 1 to 3, characterized in that the bi-directional high voltage direct current device further comprises a capacitor;
one end of the capacitor is connected with a first alternating current input end of the alternating current module, and the other end of the capacitor is connected with a DC side of the bidirectional AC/DC converter.
5. The bi-directional high voltage direct current device of claim 4,
the bidirectional AC/DC converter comprises a first bidirectional AC/DC converter and a second bidirectional AC/DC converter;
the bidirectional isolation DC/DC converter comprises a first bidirectional isolation DC/DC converter and a second bidirectional isolation DC/DC converter;
the bidirectional non-isolated DC/DC converter comprises a first bidirectional non-isolated DC/DC converter and a second bidirectional non-isolated DC/DC converter;
the capacitor includes a first capacitor and a second capacitor.
6. The bi-directional high voltage direct current device of claim 5,
the first bidirectional AC/DC converter and the second bidirectional AC/DC converter are connected in parallel and then are respectively connected with the first bidirectional isolation DC/DC converter and the second bidirectional isolation DC/DC converter;
the first bidirectional isolation DC/DC converter is connected with the first bidirectional non-isolation DC/DC converter in series, and the second bidirectional isolation DC/DC converter is connected with the second bidirectional non-isolation DC/DC converter in series;
and the first bidirectional non-isolated DC/DC converter and the second bidirectional non-isolated DC/DC converter are connected in parallel and then are connected with the direct current module.
7. The bi-directional high voltage direct current device of claim 5,
one end of the first capacitor is connected with the positive pole of the DC side of the first bidirectional AC/DC converter, and the other end of the second capacitor is connected with the negative pole of the DC side of the second bidirectional AC/DC converter;
and the other end of the first capacitor is connected with one end of the second capacitor in parallel and then is connected with the alternating current module.
8. A test apparatus for a bi-directional high voltage dc voltage installation, the test apparatus comprising a control terminal and at least two bi-directional high voltage dc voltage installations according to any of claims 1 to 7 communicatively connected to the control terminal;
the AC side outlets corresponding to the two-way high-voltage direct-current devices are respectively connected to an alternating current power grid;
and the control terminal performs aging test on each bidirectional high-voltage direct-current device by controlling the respective corresponding working mode of each bidirectional high-voltage direct-current device.
9. The testing apparatus for a bi-directional hvdc device in accordance with claim 8, wherein each two bi-directional hvdc devices are connected at their respective DC side outlets, each two bi-directional hvdc devices are connected at their respective AC side outlets, and a DC/AC power supply loop is formed between each two bi-directional hvdc devices to provide AC/DC power supply to each other.
10. Test equipment for a bi-directional high voltage direct current device according to any of claims 8 to 9, characterized in that the test equipment for a bi-directional high voltage direct current device further comprises a PLC module;
the PLC module is respectively connected with each bidirectional high-voltage direct-current device, and the PLC module is arranged for disconnecting one of the bidirectional high-voltage direct-current devices in every two bidirectional high-voltage direct-current devices from the alternating current power grid.
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| CN202123454126.0U CN216774634U (en) | 2021-12-31 | 2021-12-31 | Bidirectional high-voltage direct-current device and test equipment |
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| CN202123454126.0U CN216774634U (en) | 2021-12-31 | 2021-12-31 | Bidirectional high-voltage direct-current device and test equipment |
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