CN211209604U - Power module passive bypass device of modularized multi-level converter valve - Google Patents
Power module passive bypass device of modularized multi-level converter valve Download PDFInfo
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- CN211209604U CN211209604U CN202020328286.7U CN202020328286U CN211209604U CN 211209604 U CN211209604 U CN 211209604U CN 202020328286 U CN202020328286 U CN 202020328286U CN 211209604 U CN211209604 U CN 211209604U
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Abstract
The embodiment of the utility model provides a passive bypass device of power module of many level of modularization change of current valve includes bypass switch, the combination of full accuse switch element, first energy storage electric capacity, discharge resistance, from the energy-taking power, controller, first controllable switch device, second energy storage electric capacity, the controllable switch device of second and passive excessive pressure trigger circuit, is provided with magnetic coil on the bypass switch. The power module passive bypass device of the modular multilevel converter valve provides power for the bypass switch through the first energy storage capacitor to realize closing without depending on energy supply of a self-energy-taking power supply; when the self-energy-taking power supply or the controller fails to cause the closing failure of the bypass switch, the passive overvoltage trigger circuit is adopted to trigger and conduct the second controllable switch device and the electric energy stored by the first energy storage capacitor to supply power to the second magnetic coil to drive the second bypass switch to be closed, the situation that the closing failure of the bypass switch is caused after the self-energy-taking power supply or the controller fails is avoided, and the reliability and the safety of flexible direct-current power transmission are improved.
Description
Technical Field
The utility model relates to a flexible direct current transmission technical field especially relates to a passive bypass device of power module of many level of modularization change of current valve.
Background
As a new generation of dc transmission technology, flexible dc transmission is still composed of a converter station and a dc transmission line (usually a dc cable), similar in structure to high voltage dc transmission. [1] The VSC-HVDC technology based on the voltage source converter is proposed by Boon-TeckOoi and the like of McGill university in 1990, is a novel power transmission technology based on the voltage source converter, a self-turn-off device and a Pulse Width Modulation (PWM) technology, and has the advantages of capability of supplying power to a passive network, no phase change failure, no need of communication between converter stations, easiness in forming a multi-terminal direct current system and the like.
The existing flexible direct current transmission project generally adopts a modular multilevel topology as a basic structure form of a converter valve, each bridge arm of the converter valve in the topology is formed by connecting power modules in series, and each power module comprises an IGBT device, a capacitor, a discharge resistor, a self-energy-taking power supply, a mechanical bypass switch, a power module controller and the like. Each power module is connected with a valve-level control protection device at ground potential only through a pair of optical fibers, a working power supply of secondary elements such as a controller and the like in the power module and a driving power supply of the mechanical bypass switch are provided by a self-energy-taking power supply in the power module, and the primary side of the self-energy-taking power supply takes electricity from two ends of a capacitor of the power module.
When the primary and secondary elements in the power module are in fault to influence the normal work of the power module, the power module controller sends a bypass command to the mechanical bypass switch to close the bypass switch, so that the power module is cut off from the series circuit, and the converter valve can continue to operate within the range of the redundancy number of the power module. The mechanical bypass switch in the existing flexible direct current transmission needs to be closed to meet two conditions: the energy storage of an energy storage capacitor used for driving the switch to be closed in the mechanical bypass switch is sufficient; and secondly, the mechanical bypass switch correctly receives a bypass command below the controller. Therefore, when the self-energy-taking power supply or the controller in the power module fails and the two conditions are not met simultaneously, the mechanical bypass switch can generate refusal, the current and the voltage generated after the refusal can break down electronic devices such as IGBT devices and the like, and even destructive consequences such as explosion and rupture can be generated, so that the safety of the converter valve is seriously threatened, and the reliability and the safety performance of flexible direct-current transmission are low.
As shown in fig. 7, a power module of the conventional converter valve includes a driving circuit for driving a bypass switch K to close, the direction of the view in fig. 6 is taken as a reference direction, the driving circuit includes a magnetic coil L, a second energy storage capacitor C2, a first controllable switching device T1 and a controller, a first end of the magnetic coil L1 is connected to a second end of the first controllable switching device T1, a second end of the magnetic coil L1 is connected to an anode of the second energy storage capacitor C2 and an anode of the self-powered power source Vc, respectively, a second end of the first controllable switching device T1 is connected to a cathode of the second energy storage capacitor C2 and a cathode of the self-powered power source Vc, and a control end of the first controllable switching device T1 is connected to the controller, wherein the self-powered power source Vc provides power to the second energy storage capacitor C2, the first controllable switching device T1 is used for triggering, when a power module of the converter valve fails, the power module has a failure, the first controllable switching device T may break down, the magnetic switch C may break, the first controllable switching device T may trigger a secondary switch C18 may break, and the power module may even may break down, the power module may trigger a secondary failure of the power storage capacitor C18, and the power module may break.
Therefore, in view of the above situation, how to improve the reliability and safety of the flexible dc transmission becomes an important technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a passive bypass device of power module of modularization multilevel converter valve for there is the potential safety hazard in the converter valve power module of solving current flexible direct current transmission, the reliability that leads to flexible direct current transmission is low and the poor technical problem of security performance.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
a passive bypass device of a power module of a modularized multi-level converter valve is applied to flexible direct current transmission and comprises a fully-controlled switch element combination, a first energy storage capacitor, a discharge resistor, a self-energy-obtaining power source and a controller, the passive bypass device of the power module of the modularized multi-level converter valve further comprises at least two groups of bypass switches, a first controllable switch device, a second controllable switch device and a passive overvoltage trigger loop, the two groups of bypass switches are respectively a first bypass switch and a second bypass switch, the first bypass switch comprises a first switch element, a first magnetic coil and a second energy storage capacitor, and the second bypass switch comprises a second switch element and a second magnetic coil;
the first end of the first magnetic coil is connected with the anode of the self-energy-taking power supply and the anode of the second energy storage capacitor respectively, the second end of the first magnetic coil is connected with the second end of the first controllable switch device, the control end of the first controllable switch device is connected with the controller, and the first end of the first controllable switch device and the cathode of the second energy storage capacitor are both connected with the cathode of the self-energy-taking power supply;
the first end of the second magnetic coil is connected with the discharge resistor, the second end of the second magnetic coil is connected with the second end of the second controllable switch device, the control end of the second controllable switch device is connected with the passive overvoltage trigger circuit, the passive overvoltage trigger circuit is connected with the first energy storage capacitor, and the first end of the second controllable switch device is connected with the negative electrode of the first energy storage capacitor.
Preferably, the passive overvoltage trigger circuit is configured to trigger the second controllable switching device to conduct and operate, and the passive overvoltage trigger circuit includes a first overvoltage protection device, a third resistor, and a fourth resistor, where the third resistor and the fourth resistor are connected in series and a series connection point of the third resistor and the fourth resistor is used as a first node, a second end of the first overvoltage protection device is connected to the first node, and a first end of the first overvoltage protection device is connected to a control end of the second controllable switching element.
Preferably, the discharge resistor includes a first resistor and a second resistor connected in series with the first resistor, a series connection point of the first resistor and the second resistor serves as a second node, the second node is connected with a first end of the second magnetic coil, and a first end of the second controllable switching device is connected with the second resistor and the self-energy-taking power supply respectively.
Preferably, the first overvoltage protection device is a breakdown diode.
Preferably, the first controllable switching device is a thyristor, an IGBT device or an IEGT device.
Preferably, the passive overvoltage trigger circuit includes a first overvoltage protection device, a third resistor, a fourth resistor, and at least one second overvoltage protection device connected to the first overvoltage protection device, the third resistor and the fourth resistor are connected in series, and a series connection point of the third resistor and the fourth resistor is a first node, a second terminal of the first overvoltage protection device is connected to the first node, and a first terminal of the second overvoltage protection device is connected to a control terminal of the second controllable switching element.
Preferably, the second overvoltage protection device is a breakdown diode.
Preferably, the second controllable switching device is a controllable switching device composed of a thyristor, an IGBT device or an IEGT device.
Preferably, the second controllable switching device is a controllable switching device formed by connecting at least two thyristors, IGBT devices or IEGT devices in series.
Preferably, the fully-controlled switch element is combined into a fully-controlled switch element connection structure of any one of a half-bridge submodule, a full-bridge submodule, a clamping submodule, a series connection submodule, a diode clamping submodule and an enhanced self-resistance submodule.
According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage: the power module passive bypass device of the modular multilevel converter valve provides power for the bypass switch through the first energy storage capacitor to realize closing without depending on energy supply of a self-energy-taking power supply; when the self-energy-taking power supply or the controller fails, the bypass switch is failed to be closed, the first energy storage capacitor is inevitably charged under the bridge arm current combined by the full-control switch element, and after the threshold value is reached, the passive overvoltage trigger circuit is adopted to trigger and conduct the second controllable switch device and is not controlled by the controller, and the electric energy stored by the first energy storage capacitor supplies power to the second magnetic coil to drive the second movable bypass switch to be closed, so that the condition that the bypass switch is failed to be closed after the self-energy-taking power supply or the controller fails is avoided, and the technical problems that the safety potential exists in the converter valve power module of the existing flexible direct-current power transmission, the reliability of the flexible direct-current power transmission is low, and the safety performance is poor are solved.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of a first embodiment of a passive bypass device of a power module of a modular multilevel converter valve according to an embodiment of the present invention.
Fig. 2 is another schematic circuit diagram of a first embodiment of a passive bypass device of a power module for a modular multilevel converter valve according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a second embodiment of a passive bypass device of a power module of a modular multilevel converter valve according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a third embodiment of a power module passive bypass device of a modular multilevel converter valve according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a fourth embodiment of a passive bypass device of a power module of a modular multilevel converter valve according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a converter valve in existing flexible direct current transmission.
Fig. 7 is a schematic structural diagram of a converter valve power module driving bypass switch in existing flexible direct current power transmission.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the embodiment of the present invention, the described bypass switch K may be a mechanical magnetic switch, and the described fully-controlled switch element combination is a combination of fully-controlled switch elements such as IGBT, IEGT and IGCT. The described controllable switch device can be a thyristor, and can also be other controllable devices such as an IGBT, an IEGT and the like which can realize triggering and opening. The overvoltage protection device is preferably a Break-down diode (Break over diode).
Fig. 6 is a schematic structural diagram of a converter valve in existing flexible direct current transmission.
As shown in fig. 6, a power module of a converter valve in existing flexible direct current transmission includes a bypass switch K, a fully-controlled switching element combination S, a first energy storage capacitor C1, a discharge resistor R, and a self-energy-taking power source Vc. The bypass switch K is connected with the power supply input end, the bypass switch K is respectively connected with the first energy storage capacitor C1, the discharge resistor R and the self-energy-taking power supply Vc through the full-control switch element combination S, and the first energy storage capacitor C1 and the discharge resistor R are respectively connected with the self-energy-taking power supply Vc in parallel.
It should be noted that the full-control switching element combination S may be a full-control switching element connection structure in a half-bridge sub-module, or may be a full-control switching element connection structure in a full-bridge sub-module, a full-control switching element connection structure in a clamping sub-module, a full-control switching element connection structure in a serial connection sub-module, a full-control switching element connection structure in a diode clamping sub-module, a full-control switching element connection structure in an enhanced self-resistance sub-module, or the like. The connection structure of the fully-controlled switching element described above has been disclosed in "key performance research of MMC submodule having dc fault clearing capability" on pages 2114 to 2122 of the report of electrical engineering of china, volume 36, No. 8, month 4 and No. 20 of 2016.
The embodiment of the application provides a passive bypass device of power module of modularization multi-level converter valve, which is applied to flexible direct current power transmission and used for solving the technical problems of low reliability and poor safety performance of the flexible direct current power transmission caused by potential safety hazards existing in the converter valve power module of the existing flexible direct current power transmission.
The first embodiment is as follows:
fig. 1 is a schematic circuit diagram of a first embodiment of a passive bypass device of a power module of a modular multilevel converter valve according to an embodiment of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a passive bypass device for a power module of a modular multilevel converter valve, which is applied to flexible dc power transmission, and includes a fully-controlled switch element combination S, a first energy storage capacitor C1, a discharge resistor, a self-powered power source Vc, a controller, a first controllable switch device T1, a second energy storage capacitor C2, a second controllable switch device T2, a passive overvoltage trigger circuit 10, and at least two sets of bypass switches, where the two sets of bypass switches are a first bypass switch and a second bypass switch respectively, the first bypass switch includes a first switch element K1, a first magnetic coil L and a second energy storage capacitor C2, the second bypass switch includes a second switch element K2 and a second magnetic coil L2, a first end of the first magnetic coil L1 is connected to an anode of the self-powered power source Vc and an anode of the second energy storage capacitor C2, a second end of the first magnetic coil L is connected to a second controllable switch device T5842, a second end of the first magnetic coil L is connected to a cathode of the first controllable switch element T4642, a cathode of the first magnetic switch is connected to a cathode of the second controllable switch C465, and a cathode of the second controllable switch C465 is connected to a cathode of the second controllable switch device C4624, and a cathode of the passive switch is connected to a cathode switch of the passive switch C465, and a second controllable switch device C465, and a cathode switch of the passive switch device C465, and a cathode switch is connected to a controllable switch of the passive switch device of the passive switch.
The first bypass switch and the second bypass switch are preferably mechanical switches such as relays.
The embodiment of the utility model provides an in, first controllable switch element T1 and second controllable switch device T2 among the passive bypass device of power module of this modularization multi-level converter valve all can be single thyristor, also can be that a plurality of thyristors are established ties and are constituteed, also can realize triggering other controllability devices such as opening IGBT, IEGT.
In the embodiment of the present invention, the first energy storage capacitor C1 is an energy source for providing two sets of bypass switch closing operation structures, and does not depend on the energy supply from the energy-taking power source Vc.
In an embodiment of the present invention, the triggering of the second controllable switch element T2 is performed by the passive overvoltage trigger circuit 10 containing BOD elements, and does not depend on the controller to control the triggering operation of the second controllable switch element T2.
The embodiment of the utility model provides an in, lead to the closed failure of first switching element K1 of first bypass switch after getting can power Vc or controller trouble, it is inevitable process that first energy storage electric capacity C1 charges continuously under the bridge arm current of full-controlled switching element combination S, and reach passive overvoltage trigger circuit 10 after the threshold value and realize triggering and first energy storage electric capacity C1 have the energy storage to carry out the coil drive and also be inevitable process, consequently the design of the invention provides the reserve that the passive bypass device of power module of a modularization multi-level converter valve can regard as current bypass scheme, for providing reliable bypass starting drive for bypass switch K, improve the reliability and the security of flexible direct current transmission' S direct current power module operation.
The embodiment of the utility model provides an in, the full-control switch component combination S can be selected to half-bridge submodule piece, full-bridge submodule piece, clamp submodule piece, the series connection submodule piece, diode clamp type submodule piece, the reinforcing is from the full-control switch component connection structure who hinders any one of type submodule piece.
The utility model provides a passive bypass device of power module of modularization multilevel converter valve provides power for the bypass switch through the first energy storage capacitor to realize the closing, does not rely on the energy supply of the self-energy-taking power; when the self-energy-taking power supply or the controller fails, the bypass switch is failed to be closed, the first energy storage capacitor is inevitably charged under the bridge arm current combined by the full-control switch element, and after the threshold value is reached, the passive overvoltage trigger circuit is adopted to trigger and conduct the second controllable switch device and is not controlled by the controller, and the electric energy stored by the first energy storage capacitor supplies power to the second magnetic coil to drive the second bypass switch to be closed, so that the situation that the first bypass switch is failed to be closed after the self-energy-taking power supply or the controller fails is avoided, and the technical problems that the safety potential exists in the existing converter valve power module for flexible direct-current power transmission, the reliability of the flexible direct-current power transmission is low, and the safety performance is poor are solved.
Fig. 2 is another schematic circuit diagram of a first embodiment of a passive bypass device of a power module for a modular multilevel converter valve according to an embodiment of the present invention.
As shown in fig. 2, in an embodiment of the present invention, the passive overvoltage trigger circuit 10 is used to trigger the second controllable switching element T2 to conduct, the passive overvoltage trigger circuit 10 includes a first overvoltage protection device BOD1, a third resistor R3 and a fourth resistor R4, the third resistor R3 and the fourth resistor R4 are connected in series, and the series connection point thereof is a first node a, a second end of the first overvoltage protection device BOD1 is connected to the first node a, and a first end of the first overvoltage protection device BOD1 is connected to a control end of the second controllable switching element T2. The third resistor R3 and the fourth resistor R4 are connected in series and then connected in parallel with the self-energy-taking power supply Vc.
It should be noted that the first overvoltage protection device BOD1 is preferably a breakdown diode. In this embodiment, one breakdown diode may be disposed on the passive overvoltage trigger circuit 10, or a plurality of breakdown diodes connected in series may be disposed on the passive overvoltage trigger circuit. In other embodiments, the first overvoltage protection device BOD1 may also be other components capable of achieving a particular voltage stable breakdown characteristic.
As shown in fig. 2, in an embodiment of the present invention, the discharging resistor R includes a second resistor R2 formed by connecting a first resistor R1 and a first resistor R1 in series, a series connection point of the first resistor R1 and the second resistor R2 serves as a second node B, the second node B is connected to a first end of the second magnetic coil L2, and a first end of the second controllable switching device T2 is connected to the second resistor R2 and the self-powered power source Vc, wherein the first resistor R1 is connected to the second resistor R2 in series and then connected to the first energy storage capacitor C1 and the self-powered power source Vc in parallel.
It should be noted that the first resistor R1 is used to limit the magnitude of the current discharged from the first energy-storage capacitor C1 to the magnetic coil L1 after the second controllable switch device T2 is triggered and turned on, and the resistance of the first resistor R1 may be determined according to the magnitude of the current required for driving the bypass switch k.the second resistor R2 is high to limit the magnitude of the loop current of the power module in the converter valve in normal operation, and the second resistor R2 is also connected in series with the first resistor R1 to form the discharge resistor of the power module.different engineering first energy-storage capacitor C1 and the second controllable switch device T2 are different in value, so that the parameter of the third resistor R3 cannot be determined in the present invention, but the principle and the function are the same.
In the embodiment of the utility model, when the power module on the converter valve is normal with the controller in flexible direct current transmission, supply power for second energy storage capacitor C2 by the self-energy-taking power Vc, control first controllable switch device T1 by the controller and trigger and switch on, realize the closed normal work of bypass switch K, the utility model discloses a second power module 20's theory of operation is that after the self-energy-taking power Vc or the controller of power module on the converter valve broke down in flexible direct current transmission, bypass switch K can' T realize closing, first energy storage capacitor C1 will continue to charge under the converter valve's bridge arm current, after first energy storage capacitor C1's voltage reached certain threshold value (generally be below the power module in the whole controlled switch component withstand voltage value of whole controlled switch component combination, different engineering can adjust according to the first part withstand voltage value), first overvoltage protection device 1 in passive overvoltage trigger return circuit 10 is punctured, first energy storage capacitor C3 realizes through third energy storage capacitor R3 that the second controllable switch component withstand voltage value is below, thereby the closed magnetic force switch device can realize that the closed magnetic force switch of second energy storage capacitor C632 is closed to the second direct current transmission power module, thereby can obtain the closed magnetic force switch magnetism switch device and switch 3, thereby can realize that the closed power module is closed power module after the second direct current transmission is reached the reliability is reached the second direct current conversion valve, the second direct current transmission, thereby the reliability is reached the second energy storage capacitor C8652, thereby it can obtain the closed magnetic force switch 3 and the bypass switch 3, make the bypass switch 3 is reached.
Example two:
as shown in fig. 3, fig. 3 is a schematic circuit diagram of a second embodiment of a passive bypass device of a power module of a modular multilevel converter valve according to an embodiment of the present invention.
The working principle of the second embodiment is the same as that of the first embodiment, except that the passive overvoltage trigger circuit 10 is composed of at least two connected overvoltage protection devices BOD, a third resistor R3 and a fourth resistor R4. Wherein, two overvoltage protection devices BOD can be connected in series or in parallel.
In this embodiment, two serially connected overvoltage protection devices BOD are taken as a case, the two overvoltage protection devices BOD1 are a first overvoltage protection device BOD1 and a second overvoltage protection device BOD2, respectively, and after being serially connected to the first overvoltage protection device BOD1 and the second overvoltage protection device BOD2, the first overvoltage protection device BOD1 is connected to the control terminals of the first node a and the second controllable switching device T2, respectively.
The working principle of the power module passive bypass device of the modular multi-level converter valve in the second embodiment is the same as or similar to that of the first embodiment, and therefore, the working principle is not illustrated in the first embodiment.
Example three:
as shown in fig. 4, fig. 4 is a schematic circuit diagram of a third embodiment of a passive bypass device of a power module of a modular multilevel converter valve according to an embodiment of the present invention.
The third embodiment has the same operation principle as the first embodiment, except that the power module passive bypass apparatus of the modular multilevel converter valve comprises at least two controllable switching devices T connected in series, and is formed by connecting two controllable switching devices T in series and serves as a second controllable switching device T2. In the present embodiment, two controllable switching devices T connected in series are taken as a case, the two controllable switching devices T are respectively a third controllable switching device T3 and a fourth controllable switching device T4, and after the third controllable switching device T3 and the fourth controllable switching device T4 are connected in series, they are respectively connected to the first end of the magnetic coil T2 and the first end of the controllable switching device.
It should be noted that the controllable switching device T may be a thyristor, or may also be a controllable switching device having the same function or function, such as an IGBT device and an IEGT device.
The working principle of the power module passive bypass device of the modular multi-level converter valve in the third embodiment is the same as or similar to that of the first embodiment, and therefore, the passive bypass device is not illustrated in the first embodiment.
Example four:
as shown in fig. 5, fig. 5 is a schematic circuit diagram of a fourth embodiment of a passive bypass device of a power module of a modular multilevel converter valve according to an embodiment of the present invention.
The working principle of the fourth embodiment is the same as that of the first embodiment, except that the passive overvoltage trigger circuit 10 is composed of at least two serially connected overvoltage protection devices BOD, a third resistor R3 and a fourth resistor R4, in this embodiment, two serially connected overvoltage protection devices BOD1 are respectively a first overvoltage protection device BOD1 and a second overvoltage protection device BOD2, a first overvoltage protection device BOD1 and a second overvoltage protection device BOD2 are serially connected and then respectively connected with the control ends of a first node a and a second controllable switch device T2, in the passive bypass apparatus of the power module of the modular multilevel converter valve, at least two controllable switch devices T are serially connected, two serially connected controllable switch devices T are composed of the first controllable switch device T635 and serve as the second controllable switch device T2, in this embodiment, two serially connected controllable switch devices T are respectively connected as the case, and two controllable switch devices T are respectively a third controllable switch device T3 and a fourth controllable switch device T4, and a third controllable switch device T L is serially connected with a fourth controllable switch device T361.
The working principle of the power module passive bypass arrangement of the modular multilevel converter valve in the fourth embodiment is the same as or similar to that of the first embodiment, and therefore, the description of the passive bypass arrangement is omitted in this embodiment.
It should be noted that the power module passive bypass apparatus of the modular multilevel converter valve may further include at least two controllable switching devices T connected in series, and is formed by connecting two controllable switching devices T in series and serves as the first controllable switching device T1.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; 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 (10)
1. A passive bypass device of a power module of a modularized multi-level converter valve is applied to flexible direct current transmission and comprises a fully-controlled switch element combination, a first energy storage capacitor, a discharge resistor, a self-energy-taking power source and a controller, and is characterized in that the passive bypass device of the power module of the modularized multi-level converter valve further comprises at least two groups of bypass switches, a first controllable switch device, a second controllable switch device and a passive overvoltage trigger loop, the two groups of bypass switches are respectively a first bypass switch and a second bypass switch, the first bypass switch comprises a first switch element, a first magnetic coil and a second energy storage capacitor, and the second bypass switch comprises a second switch element and a second magnetic coil;
the first end of the first magnetic coil is connected with the anode of the self-energy-taking power supply and the anode of the second energy storage capacitor respectively, the second end of the first magnetic coil is connected with the second end of the first controllable switch device, the control end of the first controllable switch device is connected with the controller, and the first end of the first controllable switch device and the cathode of the second energy storage capacitor are both connected with the cathode of the self-energy-taking power supply;
the first end of the second magnetic coil is connected with the discharge resistor, the second end of the second magnetic coil is connected with the second end of the second controllable switch device, the control end of the second controllable switch device is connected with the passive overvoltage trigger circuit, the passive overvoltage trigger circuit is connected with the first energy storage capacitor, and the first end of the second controllable switch device is connected with the negative electrode of the first energy storage capacitor.
2. The passive bypass arrangement of a power module for a modular multilevel converter valve according to claim 1, wherein the passive overvoltage trigger circuit is configured to trigger the second controllable switch device to conduct, and the passive overvoltage trigger circuit comprises a first overvoltage protection device, a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series, and a series connection point of the third resistor and the fourth resistor is a first node, a second terminal of the first overvoltage protection device is connected to the first node, and a first terminal of the first overvoltage protection device is connected to a control terminal of the second controllable switch device.
3. The power module passive bypass arrangement for a modular multilevel converter valve of claim 2, wherein the first overvoltage protection device is a breakdown diode.
4. The passive bypass arrangement according to claim 1, wherein the passive overvoltage trigger circuit comprises a first overvoltage protection device, a third resistor, a fourth resistor, and at least a second overvoltage protection device connected to the first overvoltage protection device, the third resistor and the fourth resistor are connected in series with their series connection point as a first node, the second terminal of the first overvoltage protection device is connected to the first node, and the first terminal of the second overvoltage protection device is connected to the control terminal of the second controllable switching element.
5. The power module passive bypass arrangement of modular multilevel converter valves of claim 4, wherein the second overvoltage protection device is a breakdown diode.
6. The power module passive bypass arrangement of a modular multilevel converter valve according to claim 1, wherein the first controllable switch device is a thyristor, an IGBT device or an IEGT device.
7. The passive bypass arrangement of power module for modular multilevel converter valve according to claim 1, wherein the discharging resistor comprises a second resistor having a first resistor connected in series with the first resistor, the series connection point of the first resistor and the second resistor is a second node, the second node is connected with the first end of the second magnetic coil, and the first end of the second controllable switch device is connected with the second resistor and the self-powered power supply respectively.
8. The power module passive bypass arrangement of a modular multilevel converter valve according to claim 1, wherein the second controllable switch device is a controllable switch device consisting of a thyristor, an IGBT device or an IEGT device.
9. The power module passive bypass arrangement of a modular multilevel converter valve according to claim 1, wherein the second controllable switch device is a controllable switch device of at least two thyristors, IGBT devices or IEGT devices connected in series.
10. The power module passive bypass arrangement for a modular multilevel converter valve according to claim 1, wherein the fully-controlled switching elements are combined into a fully-controlled switching element connection structure of any one of a half-bridge sub-module, a full-bridge sub-module, a clamping sub-module, a serial bi-sub-module, a diode clamping sub-module, and an enhanced self-resistance sub-module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020328286.7U CN211209604U (en) | 2020-03-16 | 2020-03-16 | Power module passive bypass device of modularized multi-level converter valve |
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| CN202020328286.7U CN211209604U (en) | 2020-03-16 | 2020-03-16 | Power module passive bypass device of modularized multi-level converter valve |
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| CN211209604U true CN211209604U (en) | 2020-08-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243746A (en) * | 2021-12-17 | 2022-03-25 | 特变电工西安柔性输配电有限公司 | Redundancy bypass circuit of flexible direct current power module |
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- 2020-03-16 CN CN202020328286.7U patent/CN211209604U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114243746A (en) * | 2021-12-17 | 2022-03-25 | 特变电工西安柔性输配电有限公司 | Redundancy bypass circuit of flexible direct current power module |
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