CN113765422A - MMC submodule double-coil bypass switch trigger device - Google Patents
MMC submodule double-coil bypass switch trigger device Download PDFInfo
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- CN113765422A CN113765422A CN202110814400.6A CN202110814400A CN113765422A CN 113765422 A CN113765422 A CN 113765422A CN 202110814400 A CN202110814400 A CN 202110814400A CN 113765422 A CN113765422 A CN 113765422A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
Abstract
The invention relates to an MMC sub-module double-coil bypass switch trigger device and an MMC sub-module adopting the same.A conventional trigger circuit and a standby trigger circuit are arranged, when the MMC sub-module has a fault and the conventional trigger circuit fails to close a bypass switch, the standby trigger circuit stores energy through a direct current capacitor of an MMC sub-module body, and automatically triggers the bypass switch to close when the stored energy reaches a preset threshold value, so that the bypass switch can still be triggered to be conducted through the standby trigger circuit under the condition that the conventional trigger circuit of the bypass switch cannot normally work due to the failure of an MMC sub-module main control board or a high-voltage power supply, manual intervention is not needed, the MMC sub-module with the fault is reliably bypassed, and the running reliability of a flexible direct current power transmission converter valve is greatly improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a double-coil bypass switch trigger device of an MMC sub-module.
Background
The modular multilevel converter technology becomes a main technical route for flexible direct current engineering construction, a converter valve bridge arm of the modular multilevel converter is generally formed by connecting hundreds of MMC flexible direct current submodules in series, the topological structure of the MMC submodules is as shown in figure 1, a bypass switch K is used for performing bypass protection on the MMC submodules, a main contact of the bypass switch K is connected with an output port of the submodules in parallel, the main contact of the bypass switch K is open when the submodules normally work, and when the submodules fail, the main contact of the bypass switch K is quickly closed to bypass the failed submodules, so that a system can keep normal operation; once the bypass switch K fails to close reliably, it will cause further propagation of the fault, eventually requiring the entire system to trip down. Therefore, under the condition of MMC sub-module fault, especially under the condition that the conventional trigger loop of the bypass switch fails due to the fault of the MMC sub-module, the fact that the bypass switch can be reliably closed is guaranteed to be of great importance.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide an MMC submodule double-coil bypass switch triggering device and an MMC submodule adopting the device, and a conventional triggering circuit and a standby triggering circuit are arranged, so that the bypass switch can still be triggered to be conducted through the standby triggering circuit under the condition that the conventional triggering circuit of the bypass switch cannot normally work due to failure of an MMC submodule main control board or a high-voltage power supply, a fault MMC submodule is reliably bypassed, and the running reliability of a flexible direct-current power transmission converter valve is improved.
To achieve the above object, according to one aspect of the present invention, there is provided an MMC submodule dual-coil bypass switch triggering apparatus comprising: the system comprises a bypass switch, a conventional trigger circuit and a standby trigger circuit;
the conventional trigger circuit and the standby trigger circuit are both connected with the bypass switch and used for providing a trigger signal for the closing of the bypass switch;
the standby trigger circuit generates trigger current when the conventional trigger circuit triggers the bypass switch to fail so as to provide a trigger signal for closing the bypass switch.
Further, the bypass switch comprises a switch contact, a first switch coil and a second switch coil;
the first switching coil is connected with a conventional trigger circuit;
and the second switching coil is connected with a standby trigger circuit.
Further, the conventional trigger circuit comprises a high-voltage power supply, an energy storage unit and a switch control unit;
the high-voltage power supply is connected with the first switch coil through the energy storage unit, and when the switch control unit outputs a first switch closing trigger signal, the energy storage unit provides the stored energy to the first switch coil so as to control the switch contact of the bypass switch to be closed.
Further, the conventional trigger circuit further includes a first energy release unit, configured to release energy of the first switch coil after the bypass switch is closed.
Further, the switch control unit comprises a switch tube and a surge protection unit, and the surge protection unit is connected between a control electrode of the switch tube and the ground end.
Further, the switch tube comprises an IGBT switch tube.
Furthermore, the standby trigger circuit comprises an energy-obtaining voltage-dividing unit and a switch trigger unit;
the energy-obtaining voltage-dividing unit is connected in parallel with two ends of a direct-current capacitor of the MMC sub-module and used for dividing the voltage of the direct-current capacitor into a first voltage and a second voltage when the MMC sub-module breaks down and a conventional trigger circuit triggers the bypass switch to fail, and storing energy by utilizing the first voltage.
Further, the switch triggering unit is connected to the energy-taking voltage dividing unit, and is configured to output a second switch closing triggering signal when the second voltage reaches a predetermined threshold value, and trigger the energy-taking voltage dividing unit to supply the stored energy to the second switch coil, so as to control the switch contact of the bypass switch to be closed.
Further, the switch trigger unit comprises a thyristor and a BOD diode.
According to another aspect of the present invention, there is provided an MMC sub-module comprising an MMC sub-module body and an MMC sub-module dual-coil bypass switch triggering means;
the MMC sub-module body comprises an upper switching tube, a lower switching tube and direct current capacitors, wherein the upper switching tube and the lower switching tube are connected in series, and the direct current capacitors are connected to two ends of the upper switching tube and the lower switching tube in parallel;
the bypass switch trigger device is connected in parallel with two ends of a lower switch tube of the MMC sub-module body and used for triggering the bypass switch to be closed when the MMC sub-module body has a fault, and the bypass switch trigger device comprises the bypass switch trigger device according to the first aspect of the invention.
In summary, the invention provides a dual-coil bypass switch triggering device for an MMC sub-module and the MMC sub-module adopting the same, and by arranging a conventional triggering circuit and a standby triggering circuit, when the MMC sub-module fails and the conventional triggering circuit fails to close a bypass switch, the standby triggering circuit stores energy through a direct current capacitor of an MMC sub-module body, and automatically triggers the bypass switch to close when the stored energy reaches a preset threshold value, so that the bypass switch can still be triggered to be conducted through the standby triggering circuit under the condition that the conventional triggering circuit of the bypass switch cannot normally work due to failure of an MMC sub-module main control board or a high-voltage power supply, manual intervention is not needed, the failed MMC sub-module is reliably bypassed, and the running reliability of the flexible direct current power transmission converter valve is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a MMC sub-module topology;
wherein fig. 1(a) is a half-bridge submodule; FIG. 1(b) is a full bridge sub-module;
fig. 2 is a schematic circuit diagram of a dual-coil bypass switch triggering device of an MMC sub-module according to the present invention.
Reference numerals: k-bypass switch, L1-first coil, L2-second coil, S-switch contact, 101-conventional trigger loop, 102-standby trigger loop, 103-high voltage power supply (taking energy by DC + and DC-of capacitor C), 104-MMC master control board.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to an embodiment of the present invention, there is provided an MMC submodule dual-coil bypass switch triggering device, a schematic circuit structure of which is shown in fig. 2, the device including: a bypass switch K, a normal trigger circuit 101 and a backup trigger circuit 102. The conventional trigger circuit 101 and the standby trigger circuit 102 are both connected with the bypass switch K and used for providing a trigger signal for closing the bypass switch K; the standby trigger circuit 102 generates a trigger current when the conventional trigger circuit 101 triggers the bypass switch K to fail, so as to provide a trigger signal for closing the bypass switch K. The apparatus will be described in detail below. As shown in fig. 2, the bypass switch K includes a switch contact S, which can be closed upon activation of the first switch coil L1 or the second switch coil L2, a first switch coil L1, and a second switch coil L2. The first switching coil L1 is connected to the conventional trigger circuit 101; the second switching coil L2 is connected to the backup trigger circuit 102.
The conventional trigger circuit 101 comprises a high-voltage power supply 103, an energy storage unit and a switch control unit; the high voltage power supply 103 is connected to the first switch coil L1 through the energy storage unit, and when the switch control unit outputs the first switch closing trigger signal, the energy storage unit provides the stored energy to the first switch coil L1 to control the switch contact S of the bypass switch K to close. The switch control unit may include, for example, a switching tube VF1 and a driving circuit connected to the control terminal of the switching tube VF1, and the driving circuit may include a driving resistor R1. The switching tube VF1 may adopt an IGBT switching device, and a driving circuit at a control end of the switching tube is issued with a driving signal by the MMC main control board 104. The energy storage unit may include, for example, an energy storage capacitor C1, the energy storage capacitor C1 is powered by an output end of the high voltage power supply 103 of the MMC sub-module, when the MMC main control board 104 issues a driving signal to trigger the bypass switch K to close, the energy storage capacitor C1 provides the stored energy to the first switch coil L1, and under the effect of the electromagnetic force of the first switch coil L1, the main contact of the bypass switch K is triggered to close. A surge protection unit may be further connected between the control end of the switching tube VF1 and the ground, and the surge protection unit may include, for example, a parallel branch consisting of a resistor R2 and a bidirectional TVS tube DG1, and may effectively protect the control end of the VF1 from various surge pulses. The conventional trigger circuit may further include a first energy discharge unit, which may include a freewheeling diode D1, the freewheeling diode D1 being connected in parallel with the first switching coil L1 of the bypass switch K, and the energy of the first switching coil L1 may be discharged through the freewheeling diode D1 after the bypass switch K is closed.
The standby trigger circuit 102 comprises an energy-taking voltage-dividing unit and a switch trigger unit; the energy-obtaining voltage-dividing unit is connected in parallel to two ends of a direct-current capacitor of the MMC sub-module, for example, the energy-obtaining voltage-dividing unit can comprise voltage-dividing resistors R3, R4, an energy-storing capacitor C2 and an anti-reverse diode D2, and is used for dividing the voltage of the direct-current capacitor into a first voltage and a second voltage when the MMC sub-module breaks down and a conventional trigger circuit triggers a bypass switch to fail, the first voltage is used for storing energy, the R3 and the R4 are connected in series and then connected in parallel to the output end of the direct-current capacitor C of the MMC sub-module to share the capacitor voltage of the MMC sub-module, and the voltage obtained by dividing the R4 charges the energy-storing capacitor C2 through the anti-reverse diode D2. The switch trigger unit is connected with the energy-taking voltage-dividing unit and used for outputting a second switch closing trigger signal when the second voltage reaches a preset threshold value, and triggering the energy-taking voltage-dividing unit to provide the stored energy to the second switch coil so as to control the switch contact of the bypass switch to be closed. The switch trigger unit can comprise a thyristor T1 and a BOD diode, for example, a capacitor C2 is connected in series with a thyristor T1 and can trigger the second switch coil L2, a gate trigger signal of the thyristor T1 is controlled by the BOD diode, when the partial voltage of the resistor R3 reaches a predetermined threshold value, namely an action voltage V1 of the BOD diode, the BOD diode acts and triggers the thyristor T1 to conduct, at the moment, the energy stored in the capacitor C2 is released to the second switch coil L2 through the thyristor T1, the bypass switch K is closed, and the MMC sub-module is reliably bypassed.
The following further describes the working engineering of the MMC sub-module dual-coil bypass switch triggering device provided in this embodiment.
During normal operation of the mmc submodule, the high voltage power supply 103 charges the energy storage capacitor C1 of the conventional trigger circuit 101.
B. When the failure of the MMC sub-module is detected, the MMC main control board 104 issues a bypass switch trigger signal, and the trigger signal is output to the control end of the switching tube VF1 after being preprocessed, for example, by filtering, fiber isolation, and the like.
C. The switching tube VF1 is turned on to release the energy stored in the energy storage capacitor C1 to the first switching coil L1, so that the bypass switch K is closed.
D. If the MMC sub-module is detected to be faulty and the MMC main control board 104 or the high voltage power supply 103 fails, the conventional trigger circuit 101 cannot trigger the bypass switch K to conduct.
The MMC sub-module is continuously charged due to the fact that the bypass cannot be achieved, and the voltage of the direct-current capacitor C of the MMC sub-module is continuously increased at the moment.
F. The energy obtaining and voltage dividing unit in the standby trigger loop 102 is connected in parallel to two ends of the direct current capacitor C for obtaining energy and dividing voltage, the voltage division of the voltage dividing resistor R4 charges the capacitor C2, and when the voltage division of the voltage dividing resistor R3 reaches a BOD diode action value V1, the BOD diode acts and triggers the thyristor T1 to be conducted.
G. The energy stored in the capacitor C2 is released to the second switch coil L2 through the thyristor T1, the bypass switch K is closed, and the faulty MMC sub-module is reliably bypassed.
According to another embodiment of the present invention, there is provided an MMC sub-module, comprising an MMC sub-module body and an MMC sub-module dual-coil bypass switch triggering device; the MMC submodule body comprises an upper switch tube and a lower switch tube which are connected in series, and direct current capacitors connected to two ends of the upper switch tube and the lower switch tube in parallel. The topological structure of the MMC sub-module body may also be other topological structures of MMC sub-modules that are common in the art, and is not specifically limited herein. The bypass switch trigger device is connected in parallel with two ends of a lower switch tube of the MMC sub-module body and used for triggering the bypass switch to be closed when the MMC sub-module body breaks down, and the bypass switch trigger device comprises the bypass switch trigger device according to the first embodiment of the invention.
In summary, the invention relates to a double-coil bypass switch triggering device for an MMC sub-module and the MMC sub-module adopting the device, and by arranging a conventional triggering circuit and a standby triggering circuit, when the MMC sub-module has a fault and the conventional triggering circuit fails to close a bypass switch, the standby triggering circuit stores energy through a direct current capacitor of an MMC sub-module body, and automatically triggers the bypass switch to close when the stored energy reaches a preset threshold value, so that the bypass switch can still be triggered to be conducted through the standby triggering circuit under the condition that the conventional triggering circuit of the bypass switch cannot normally work due to the failure of an MMC sub-module main control board or a high-voltage power supply, manual intervention is not needed, the fault sub-module MMC is reliably bypassed, and the operation reliability of a flexible direct-current power transmission converter valve is greatly improved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. The utility model provides a MMC submodule piece twin coil bypass switch trigger device which characterized in that includes: the system comprises a bypass switch, a conventional trigger circuit and a standby trigger circuit;
the conventional trigger circuit and the standby trigger circuit are both connected with the bypass switch and used for providing a trigger signal for the closing of the bypass switch;
the standby trigger circuit generates trigger current when the conventional trigger circuit triggers the bypass switch to fail so as to provide a trigger signal for closing the bypass switch.
2. The apparatus of claim 1, wherein the bypass switch comprises a switch contact, a first switch coil, a second switch coil;
the first switching coil is connected with a conventional trigger circuit;
and the second switching coil is connected with a standby trigger circuit.
3. The apparatus of claim 2, wherein the conventional trigger circuit comprises a high voltage power supply, an energy storage unit, and a switch control unit;
the high-voltage power supply is connected with the first switch coil through the energy storage unit, and when the switch control unit outputs a first switch closing trigger signal, the energy storage unit provides the stored energy to the first switch coil so as to control the switch contact of the bypass switch to be closed.
4. The apparatus of claim 3, wherein the conventional trigger circuit further comprises a first energy discharge unit for discharging energy from the first switch coil after the bypass switch is closed.
5. The apparatus of claim 4, wherein the switching control unit comprises a switching tube and a surge protection unit connected between a control pole of the switching tube and ground.
6. The apparatus of claim 5, wherein the switch tube comprises an IGBT switch tube.
7. The device of claim 2, wherein the backup trigger circuit comprises an energy-taking voltage-dividing unit and a switch trigger unit;
the energy-obtaining voltage-dividing unit is connected in parallel with two ends of a direct-current capacitor of the MMC sub-module and used for dividing the voltage of the direct-current capacitor into a first voltage and a second voltage when the MMC sub-module breaks down and a conventional trigger circuit triggers the bypass switch to fail, and storing energy by utilizing the first voltage.
8. The device of claim 7, wherein the switch triggering unit is connected to the energy-taking voltage-dividing unit, and configured to output a second switch-closing triggering signal when the second voltage reaches a predetermined threshold value, and trigger the energy-taking voltage-dividing unit to provide the stored energy to the second switch coil, so as to control the switch contact of the bypass switch to close.
9. The apparatus of claim 8, wherein the switch trigger unit comprises a thyristor and a BOD diode.
10. The MMC sub-module is characterized by comprising an MMC sub-module body and an MMC sub-module double-coil bypass switch triggering device;
the topological structures of the MMC sub-modules comprise a half-bridge topological structure and a full-bridge topological structure;
the bypass switch triggering device is connected in parallel with two ends of a lower switch tube of the MMC sub-module body and used for triggering the bypass switch to be closed when the MMC sub-module body has a fault, and the bypass switch triggering device comprises the bypass switch triggering device as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110814400.6A CN113765422A (en) | 2021-07-19 | 2021-07-19 | MMC submodule double-coil bypass switch trigger device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110814400.6A CN113765422A (en) | 2021-07-19 | 2021-07-19 | MMC submodule double-coil bypass switch trigger device |
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| CN113765422A true CN113765422A (en) | 2021-12-07 |
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| CN202110814400.6A Pending CN113765422A (en) | 2021-07-19 | 2021-07-19 | MMC submodule double-coil bypass switch trigger device |
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2021
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