CN211457009U - AC/DC converter with low voltage ride through - Google Patents
AC/DC converter with low voltage ride through Download PDFInfo
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- CN211457009U CN211457009U CN202020295199.6U CN202020295199U CN211457009U CN 211457009 U CN211457009 U CN 211457009U CN 202020295199 U CN202020295199 U CN 202020295199U CN 211457009 U CN211457009 U CN 211457009U
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Abstract
The utility model provides a low voltage ride through's AC/DC transverter, AC/DC transverter includes AC/DC subassembly, first switching device, second switching device and inductance, and the positive pole end of AC/DC subassembly is connected the second pole of first switching device; a third pole of the first switching device is connected to an anode of a direct current bus through the inductor; a third pole of the first switching device is connected to a cathode of the second switching device; the anode of the second switching device and the cathode terminal of the AC/DC assembly are both connected to the cathode of the DC bus. The utility model discloses a low voltage ride through's AC/DC transverter has had the low voltage ride through function, is favorable to the quick recovery of system, has improved the reliability of system.
Description
Technical Field
The utility model belongs to the power electronics field, in particular to AC/DC transverter that low-voltage passes through.
Background
In the existing wind power generation system, solar power generation system, thermal power generation system and related grid-connected system, Low Voltage Ride Through (LVRT) is an important factor affecting the systems.
The LVRT is characterized in that when the converter has an output short-circuit fault, the converter does not trip, keeps a continuous grid-connected state, continuously provides active or reactive power for a load or a power grid, and supports quick recovery of the fault, so that the LVRT "passes through the low-voltage fault.
The existing low-voltage AC/DC converter mostly adopts a three-phase two-level or three-phase three-level converter, when the direct current side of the converter has short circuit fault, the current on the alternating current side of the converter is rapidly increased due to the rectification effect of a diode, the direct current side and the alternating current side of the converter both generate over current, the over current protection action cuts off the converter from a load or a power grid, and therefore continuous power supply to the load or the power grid is interrupted, the fast recovery of the fault is not facilitated to a great extent, and the reliability of the system is reduced.
SUMMERY OF THE UTILITY MODEL
To address the above problems, the present invention provides an AC/DC converter with low voltage ride through.
The utility model provides a low voltage ride through's AC/DC transverter, the transverter includes: an AC/DC assembly, a first switching device, a second switching device and an inductance,
wherein the content of the first and second substances,
the anode terminal of the AC/DC component is connected with the second pole of the first switching device;
a third pole of the first switching device is connected to an anode of a direct current bus through the inductor;
a third pole of the first switching device is connected to a cathode of the second switching device;
the anode of the second switching device and the cathode terminal of the AC/DC assembly are both connected to the cathode of the DC bus.
Further, the AC/DC component is a three-phase two-level converter or a three-phase three-level converter.
Further, the three-phase two-level converter comprises a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, a seventh switching device, an eighth switching device and a first capacitor,
wherein the content of the first and second substances,
the third to eighth switching devices are respectively connected with a ninth switching device in an anti-parallel mode, second poles of the third to eighth switching devices are respectively connected with cathodes of the corresponding ninth switching devices, and third poles of the third to eighth switching devices are respectively connected with anodes of the corresponding ninth switching devices;
a third pole of the third switching device is connected with a second pole of the fourth switching device and forms a first three-phase terminal of the three-phase two-level converter;
a third pole of the fifth switching device is connected with a second pole of the sixth switching device and forms a second three-phase end of the three-phase two-level converter;
a third pole of the seventh switching device is connected with a second pole of the eighth switching device and forms a third three-phase end of the three-phase two-level converter;
a second pole of the third switching device, the fifth switching device and the seventh switching device is connected with one end of the first capacitor and is used as an anode end of the three-phase two-level converter;
and a third pole of the fourth switching device, the sixth switching device and the eighth switching device is connected with the other end of the first capacitor and is used as a cathode end of the three-phase two-level converter.
Further, the three-phase three-level converter comprises a tenth switching device, an eleventh switching device, a twelfth switching device, a tenth switching device, a fourteenth switching device, a fifteenth switching device, a sixteenth switching device, a seventeenth switching device, an eighteenth switching device, a nineteenth switching device, a twentieth switching device, a twenty-first switching device, a twenty-second switching device, a twentieth switching device, a twenty-fourteenth switching device, a twenty-fifth switching device, a twenty-sixth switching device, a twenty-seventh switching device, a second capacitor and a third capacitor,
wherein the content of the first and second substances,
a third pole of the tenth switching device is connected to the second pole of the eleventh switching device;
a third pole of the eleventh switching device is connected with a second pole of the twelfth switching device and forms a first three-phase terminal of the three-phase three-level converter;
a third pole of the twelfth switching device is connected to the second pole of the tenth switching device;
a third pole of the fourteenth switching device is connected to the second pole of the fifteenth switching device;
a third pole of the fifteenth switching device is connected with a second pole of the sixteenth switching device and forms a second three-phase terminal of the three-phase three-level converter;
a third pole of the sixteenth switching device is connected to the second pole of the seventeenth switching device;
a third pole of the eighteenth switching device is connected to the second pole of the nineteenth switching device;
a third pole of the nineteenth switching device is connected with a second pole of the twentieth switching device and forms a third three-phase terminal of the three-phase three-level converter;
a third pole of the twentieth switching device is connected to the second pole of the twenty-first switching device;
a second pole of each of the tenth switching device, the fourteenth switching device and the eighteenth switching device is connected with one end of the second capacitor to form an anode end of the three-phase three-level converter;
the other end of the second capacitor is connected with one end of the third capacitor;
a third pole of the tenth switching device, a seventeenth switching device and a twenty-first switching device is connected with the other end of the third capacitor and forms a cathode end of the three-phase three-level converter;
a cathode of the twenty-second switching device is connected to a third pole of the tenth switching device;
the anode of the twenty-second switching device is connected with the cathode of the twenty-third switching device and connected to the other end of the second capacitor;
an anode of the twentieth switching device is connected to a third pole of the twelfth switching device;
a cathode of the twenty-fourth switching device is connected to a third pole of the fourteenth switching device;
the anode of the twenty-fourth switching device is connected with the cathode of the twenty-fifth switching device and connected to the other end of the second capacitor;
an anode of the twenty-fifth switching device is connected to a third pole of the sixteenth switching device;
a cathode of the twenty-sixth switching device is connected to a third pole of the eighteenth switching device;
the anode of the twenty-sixth switching device is connected with the cathode of the twenty-seventh switching device and is connected to the other end of the second capacitor;
an anode of the twenty-seventh switching device is connected to a third pole of the twentieth switching device.
Further, the third to eighth switching devices are power switching tubes;
the ninth switching device is a diode.
Further, the tenth to twenty-first switching devices are power switching tubes;
the twenty-second to twenty-seventh switching devices are diodes.
Further, the first switch device is a power switch tube.
Further, the second switching device is a diode.
Further, the inductance is a direct current inductance.
Furthermore, the power switch tube is a full-control power electronic switch device.
Furthermore, the fully-controlled power electronic switch device is an IGBT, an MOSFET, an IEGT or an IGCT,
wherein the content of the first and second substances,
when the fully-controlled power electronic switching device is an IGBT or an IEGT, the second pole is a collector, and the third pole is an emitter;
when the fully-controlled power electronic switching device is an IGCT, the second pole is a cathode, and the third pole is an anode;
when the fully-controlled power electronic switching device is an MOSFET, the second pole is a source electrode, and the third pole is a drain electrode.
The utility model discloses a low voltage ride through's AC/DC transverter has had the low voltage ride through function, is favorable to the quick recovery of system, has improved the reliability of system. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 shows a first AC/DC converter architecture diagram with low voltage ride through according to an embodiment of the present invention;
fig. 2 shows a second AC/DC converter architecture diagram with low voltage ride through according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of an application of a low voltage ride through AC/DC converter in a DC microgrid according to an embodiment of the present invention;
fig. 4 shows an equivalent circuit during normal operation of a low voltage ride through AC/DC converter according to an embodiment of the present invention;
fig. 5 shows a schematic diagram of Sd turn-on and current flow when the DC low voltage of the low voltage ride through AC/DC converter according to the embodiment of the present invention;
fig. 6 shows a schematic diagram of Sd turn-off and current flow for a low voltage ride through AC/DC converter according to an embodiment of the present invention when DC low voltage;
fig. 7 shows a flow chart of the AC/DC converter control for low voltage ride through according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model provides a low voltage ride through's AC/DC transverter. Fig. 1 shows a structure diagram of the AC/DC converter with low voltage ride through according to the present invention. Fig. 1 shows that the AC/DC converter with low voltage ride through of the present invention is switched by three-phase two-levelCurrent transformer INV1 namely AC/DC assembly, power switch tube SdDiode VD and DC inductor LdThe structure of the utility model is that the material,
wherein the content of the first and second substances,
in the three-phase two-level inverter INV1, Sa1，Sa2，Sb1，Sb2，Sc1，Sc2The power switch tubes are respectively connected with a diode in an anti-parallel mode: the power switch tube Sa1，Sa2，Sb1，Sb2，Sc1，Sc2Respectively connected to the cathodes of respective anti-parallel diodes, and said power switching tube Sa1，Sa2，Sb1，Sb2，Sc1，Sc2The respective emitters are respectively connected with the anodes of the respective anti-parallel diodes; sa1Emitter and Sa2Is connected to and forms a first three-phase terminal a, S of the three-phase two-level inverter INV1b1Emitter and Sb2Is connected to and forms a second three-phase terminal B, S of the three-phase two-level inverter INV1c1Emitter and Sc2The collector of the three-phase two-level inverter INV1 is connected to form a third three-phase end C; sa1，Sb1，Sc1The collector of the three is connected with one end of a capacitor C and is used as the anode end P, S of the three-phase two-level inverter INV1a2，Sb2，Sc2The emitting electrodes of the three are connected with the other end of the capacitor C and are used as a cathode end N of the three-phase two-level inverter INV 1;
the anode end P of the three-phase two-level converter INV1 is connected with the power switch tube SdThe power switch tube SdThrough a direct current inductance LdAn anode DC + connected to the DC bus, and a power switch tube SdThe anode of the diode VD and the cathode terminal N of the three-phase two-level inverter INV1 are both connected to the cathode DC-of the DC bus.
Fig. 2 is a block diagram of a low voltage ride through AC/DC converter according to another embodiment of the present invention. The difference between figure 2 and figure 1 is that the three-phase two-level inverter INV1 in figure 1 is replaced by a three-phase three-level inverter INV2 as said internal AC/DC inverter,
wherein the content of the first and second substances,
in the three-phase three-level inverter INV2, Sa11，Sa22，Sa33，Sa44，Sb11，Sb22，Sb33，Sb44，Sc11，Sc22，Sc33，Sc44Is a power switch tube; sa11Emitter connection S ofa22Collector electrode of, Sa22Emitter and Sa33Is connected to and forms a first three-phase terminal a1, S of the three-phase three-level inverter INV2a33Emitter connection S ofa44A collector electrode of (a); sb11Emitter connection S ofb22Collector electrode of, Sb22Emitter and Sb33Is connected to and forms a second three-phase terminal B1, S of the three-phase three-level inverter INV2b33Emitter connection S ofb44A collector electrode of (a); sc11Emitter connection S ofc22Collector electrode of, Sc22Emitter and Sc33Is connected with and forms a third three-phase end C1, S of the three-phase three-level inverter INV2c33Emitter connection S ofc44A collector electrode of (a); sa11，Sb11，Sc11Collector electrode of (1) and capacitor CaOne end of the capacitor is connected with and forms an anode end P1 of the three-phase three-level inverter INV2, and the capacitor CaThe other end of the capacitor C is connected with a capacitor CbOne end of (A), Sa44，Sb44，Sc44Emitter of (2) and capacitor CbThe other end of the three-phase three-level inverter INV2 is connected with and forms a cathode terminal N1 of the three-phase three-level inverter INV 2; diode Da1Cathode of (2) is connected toa11Of the emitter, diode Da1Anode of (2) and diode Da2Is connected to the capacitor CaAnother terminal of (2), diode Da2Is connected to Sa33An emitter of (1); diode Db1Cathode of (2) is connected tob11Of the emitter, diode Db1Anode of (2) and diode Db2Is connected to the capacitor CaAnother terminal of (2), diodeDb2Is connected to Sb33An emitter of (1); diode Dc1Cathode of (2) is connected toc11Of the emitter, diode Dc1Anode of (2) and diode Dc2Is connected to the capacitor CaAnother terminal of (2), diode Dc2Is connected to Sc33An emitter of (1).
Although only the low voltage ride through AC/DC converter using the three-phase two-level converter INV1 and the three-phase three-level converter INV2 is shown in the embodiments of the present invention, the present invention is not limited to these two converters, and other types of converter components may be used.
Each of the power switches in the above embodiments may be an Insulated Gate Bipolar Transistor (IGBT) or an electron Injection Enhanced Gate Transistor (IEGT). When the power switching tubes are MOSFETs, the collectors of the power switching tubes in the above embodiments should be sources, and the emitters of the power switching tubes should be drains. Each power switch tube may also be an Integrated Gate Commutated Thyristor (IGCT), and when each power switch tube is an IGCT, the collector of each power switch tube in the above embodiment should be a cathode, and the emitter of each power switch tube should be an anode.
The utility model discloses a low-voltage ride through's AC/DC transverter's alternating current side and direct current side do not have electrical isolation, can keep apart through distribution transformer for connect the little electric wire netting of direct current and exchange public electric wire netting, as shown in fig. 3. In fig. 3, the utility model discloses a low voltage ride through's AC/DC transverter exchanges end accessible transformer and is connected to exchanging public power grid, and the DC end of the AC/DC transverter that low voltage ride through can be connected to the little electric wire netting of direct current, specifically, accessible DC/DC transverter is connected to and fills electric pile, photovoltaic device, energy memory, also can be connected to other direct current loads, perhaps is used for other application scenarios that do not need electrical isolation.
The utility model discloses a working process of AC/DC transverter that low-voltage passes through does:
one, when the system adopting the low-voltage ride-through AC/DC converter works normally, the power switch in the low-voltage ride-through AC/DC converterPipe SdClosed, the low voltage ride through AC/DC converter is equivalent to the AC/DC converter structure shown in fig. 4, i.e. to the DC inductor LdConnected in series in a DC loop, said LdThe diode VD is used for clamping and protecting the voltage of the dc capacitor C.
Secondly, when the AC/DC converter with low voltage ride through has low voltage fault at the direct current side, the power switch tube S is adjusteddThe duty ratio of the AC/DC converter outputs low voltage, and limits the output current of the AC/DC converter with low voltage ride through to be less than rated current, so that the AC/DC converter can run for a long time and ride through low voltage faults. As shown in fig. 5 and 6, respectively, are power switch tubes SdAnd when the AC/DC converter is switched on and switched off, the current flowing of the low-voltage ride through AC/DC converter and the current flowing of the follow current are schematically shown. As can be seen from FIG. 5, when the power switch tube SdWhen the AC/DC converter is switched on, the anode end P1 end in the AC/DC converter through which current passes by the low voltage passes through the power switch tube SdAnd a direct current inductor LdAfter power is supplied to a load connected between an anode DC + and a cathode DC-of the direct current bus, the power flows back to the cathode terminal N1, and the current tends to rise. As can be seen from FIG. 6, when the power switch tube SdWhen the direct current bus is turned off, the current in the inductor supplies power to a load connected between the anode DC + and the cathode DC-of the direct current bus, and flows back to the direct current inductor L after passing through the diode VDdThe current is in a downward trend. When the low-voltage ride-through AC/DC converter performs low-voltage current-limiting output, the power switch tube SdThe smaller the duty ratio is, the smaller the voltage output to the load is, and the power switch tube SdThe larger the duty ratio is, the larger the voltage output to the load is, and the power switch tube S is adjusteddThe duty ratio can regulate the output voltage and current of the low-voltage ride-through AC/DC converter, thereby ensuring the operation of the converter and ride-through the low-voltage fault of the DC side.
Based on the working process of the low-voltage ride-through AC/DC converter, the utility model also provides a control method of the low-voltage ride-through AC/DC converter, as shown in FIG. 7, the method includes:
1. after a system adopting the low-voltage ride-through AC/DC converter starts to work, judging whether the low-voltage ride-through AC/DC converter has a direct-current low-voltage fault or not;
2. if the DC low voltage fault occurs, adjusting the power switch tube SdSuch that the low voltage ride through AC/DC converter performs a low voltage current limited output;
3. judging whether the direct-current low-voltage fault disappears, if not, namely the direct-current low-voltage fault still exists, repeating the step 2;
4. if the direct-current low-voltage fault does not exist or disappears, closing the power switch tube SdAnd controlling the low-voltage ride-through AC/DC converter to carry out three-phase two-level or three-phase three-level conversion operation.
The working process and the control method are as follows: the utility model discloses a power switch pipe S when normal operating is passed through to AC/DC transverter of low-voltage ride throughdThe AC/DC converter is closed, can operate in four quadrants, and realizes all functions of the AC/DC converter, including bidirectional active power and bidirectional reactive power transmission; when the AC/DC converter of the low voltage ride through of the utility model has the short-circuit fault at the DC side, the power switch tube SdThe periodic switching and the periodic switching-off can provide active power output of low-voltage limited current for the direct current side, the continuous work of the converter is kept, and overcurrent does not occur on the alternating current side and the direct current side, so that the short-circuit fault of the direct current side is crossed.
Compared with the traditional low-voltage AC/DC converter, the utility model discloses a low-voltage ride through's AC/DC converter and control method thereof is through increasing power switch tube, diode and inductance to apply certain control method, thereby had the function that the low-voltage ride through, can be used to all traditional low-voltage AC/DC converter's application scene.
The first, second and … of the utility model are used for distinguishing different devices, not for marking the connection sequence of the devices.
Although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (11)
1. A low voltage ride through AC/DC converter, comprising: an AC/DC assembly, a first switching device, a second switching device and an inductance,
wherein the content of the first and second substances,
the anode terminal of the AC/DC component is connected with the second pole of the first switching device;
a third pole of the first switching device is connected to an anode of a direct current bus through the inductor;
a third pole of the first switching device is connected to a cathode of the second switching device;
the anode of the second switching device and the cathode terminal of the AC/DC assembly are both connected to the cathode of the DC bus.
2. The low voltage ride through AC/DC converter according to claim 1,
the AC/DC component is a three-phase two-level converter or a three-phase three-level converter.
3. The low voltage ride through AC/DC converter according to claim 2,
the three-phase two-level converter comprises a third switching device, a fourth switching device, a fifth switching device, a sixth switching device, a seventh switching device, an eighth switching device and a first capacitor,
wherein the content of the first and second substances,
the third to eighth switching devices are respectively connected with a ninth switching device in an anti-parallel mode, second poles of the third to eighth switching devices are respectively connected with cathodes of the corresponding ninth switching devices, and third poles of the third to eighth switching devices are respectively connected with anodes of the corresponding ninth switching devices;
a third pole of the third switching device is connected with a second pole of the fourth switching device and forms a first three-phase terminal of the three-phase two-level converter;
a third pole of the fifth switching device is connected with a second pole of the sixth switching device and forms a second three-phase end of the three-phase two-level converter;
a third pole of the seventh switching device is connected with a second pole of the eighth switching device and forms a third three-phase end of the three-phase two-level converter;
a second pole of the third switching device, the fifth switching device and the seventh switching device is connected with one end of the first capacitor and is used as an anode end of the three-phase two-level converter;
and a third pole of the fourth switching device, the sixth switching device and the eighth switching device is connected with the other end of the first capacitor and is used as a cathode end of the three-phase two-level converter.
4. The low voltage ride through AC/DC converter according to claim 2,
the three-phase three-level converter comprises a tenth switching device, an eleventh switching device, a twelfth switching device, a tenth switching device, a fourteenth switching device, a fifteenth switching device, a sixteenth switching device, a seventeenth switching device, an eighteenth switching device, a nineteenth switching device, a twentieth switching device, a twenty-first switching device, a twenty-second switching device, a twentieth switching device, a fourteenth switching device, a twenty-fifth switching device, a twenty-sixth switching device, a twenty-seventh switching device, a second capacitor and a third capacitor,
wherein the content of the first and second substances,
a third pole of the tenth switching device is connected to the second pole of the eleventh switching device;
a third pole of the eleventh switching device is connected with a second pole of the twelfth switching device and forms a first three-phase terminal of the three-phase three-level converter;
a third pole of the twelfth switching device is connected to the second pole of the tenth switching device;
a third pole of the fourteenth switching device is connected to the second pole of the fifteenth switching device;
a third pole of the fifteenth switching device is connected with a second pole of the sixteenth switching device and forms a second three-phase terminal of the three-phase three-level converter;
a third pole of the sixteenth switching device is connected to the second pole of the seventeenth switching device;
a third pole of the eighteenth switching device is connected to the second pole of the nineteenth switching device;
a third pole of the nineteenth switching device is connected with a second pole of the twentieth switching device and forms a third three-phase terminal of the three-phase three-level converter;
a third pole of the twentieth switching device is connected to the second pole of the twenty-first switching device;
a second pole of each of the tenth switching device, the fourteenth switching device and the eighteenth switching device is connected with one end of the second capacitor to form an anode end of the three-phase three-level converter;
the other end of the second capacitor is connected with one end of the third capacitor;
a third pole of the tenth switching device, a seventeenth switching device and a twenty-first switching device is connected with the other end of the third capacitor and forms a cathode end of the three-phase three-level converter;
a cathode of the twenty-second switching device is connected to a third pole of the tenth switching device;
the anode of the twenty-second switching device is connected with the cathode of the twenty-third switching device and connected to the other end of the second capacitor;
an anode of the twentieth switching device is connected to a third pole of the twelfth switching device;
a cathode of the twenty-fourth switching device is connected to a third pole of the fourteenth switching device;
the anode of the twenty-fourth switching device is connected with the cathode of the twenty-fifth switching device and connected to the other end of the second capacitor;
an anode of the twenty-fifth switching device is connected to a third pole of the sixteenth switching device;
a cathode of the twenty-sixth switching device is connected to a third pole of the eighteenth switching device;
the anode of the twenty-sixth switching device is connected with the cathode of the twenty-seventh switching device and is connected to the other end of the second capacitor;
an anode of the twenty-seventh switching device is connected to a third pole of the twentieth switching device.
5. The low voltage ride through AC/DC converter according to claim 3,
the third switching device to the eighth switching device are power switching tubes;
the ninth switching device is a diode.
6. The low voltage ride through AC/DC converter according to claim 4,
the tenth to twenty-first switching devices are power switching tubes;
the twenty-second to twenty-seventh switching devices are diodes.
7. The low voltage ride-through AC/DC converter according to claim 1, wherein the first switching device is a power switching tube.
8. The low voltage ride-through AC/DC converter according to claim 1, wherein the second switching device is a diode.
9. The low voltage ride through AC/DC converter according to claim 1, wherein the inductor is a direct current inductor.
10. A low voltage ride through AC/DC converter according to any one of claims 5 to 7, wherein the power switching tubes are fully controlled power electronic switching devices.
11. The low voltage ride through AC/DC converter according to claim 10, wherein the fully controlled power electronic switching devices are IGBTs, MOSFETs, IEGT, or IGCTs,
wherein the content of the first and second substances,
when the fully-controlled power electronic switching device is an IGBT or an IEGT, the second pole is a collector, and the third pole is an emitter;
when the fully-controlled power electronic switching device is an IGCT, the second pole is a cathode, and the third pole is an anode;
when the fully-controlled power electronic switching device is an MOSFET, the second pole is a source electrode, and the third pole is a drain electrode.
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| CN111245261A (en) * | 2020-03-11 | 2020-06-05 | 深圳供电局有限公司 | Low-voltage ride-through AC/DC converter and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111245261A (en) * | 2020-03-11 | 2020-06-05 | 深圳供电局有限公司 | Low-voltage ride-through AC/DC converter and control method thereof |
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