CN110808606A - Power module overvoltage prevention circuit of flexible direct current transmission and converter valve - Google Patents
Power module overvoltage prevention circuit of flexible direct current transmission and converter valve Download PDFInfo
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- CN110808606A CN110808606A CN201911252860.3A CN201911252860A CN110808606A CN 110808606 A CN110808606 A CN 110808606A CN 201911252860 A CN201911252860 A CN 201911252860A CN 110808606 A CN110808606 A CN 110808606A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The embodiment of the invention relates to a power module overvoltage prevention circuit of a flexible direct-current transmission and converter valve, wherein the power module of the converter valve comprises a bypass switch, a full-control switch element combination, a first energy storage capacitor, a discharge resistor and a self-energy-taking power supply, and the power module overvoltage prevention circuit of the converter valve comprises a first driving module and a second driving module; the first driving module and the second driving module respectively comprise controllable switch devices, and a first magnetic coil and a second magnetic coil are arranged on the bypass switch; the second driving module further comprises a passive overvoltage trigger unit. When the self-energy-taking power supply or the controller fails to cause the closing failure of the bypass switch, the passive overvoltage trigger unit is adopted to trigger and conduct the controllable switch device on the second driving module and the electric energy stored by the first energy storage capacitor to supply power to the second magnetic coil to drive the bypass switch to be closed, so that the condition 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 invention relates to the technical field of flexible direct current transmission, in particular to a power module overvoltage prevention circuit of a flexible direct current transmission and a converter 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 in 1990 by Boon-Teck Ooi of McGill university, Canada, and is a novel power Transmission technology based on the Voltage Source Converter, a self-turn-off device and a Pulse Width Modulation (PWM) technology.
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.
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.
Disclosure of Invention
The embodiment of the invention provides a power module overvoltage prevention circuit of a flexible direct current transmission and a converter valve, which is used for solving the technical problems of low reliability and poor safety performance of the flexible direct current transmission due to potential safety hazards of the existing flexible direct current transmission converter valve.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a power module overvoltage prevention circuit of a converter valve is applied to flexible direct-current power transmission, the power module of the converter valve in the flexible direct-current power transmission comprises a bypass switch, a full-control switch element combination, a first energy storage capacitor, a discharge resistor and a self-energy-obtaining power supply, and the power module overvoltage prevention circuit of the converter valve comprises a first driving module and a second driving module connected with the first driving module in parallel;
the bypass switch is provided with a first magnetic coil and a second magnetic coil which respectively correspond to the first driving module and the second driving module, and the first magnetic coil and the second magnetic coil are used for driving the bypass switch to be closed;
the second driving module further comprises a passive overvoltage triggering unit for triggering the controllable switching device in the second driving module to be conducted.
Preferably, the passive overvoltage triggering unit includes an 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 end of the overvoltage protection device is connected to the first node, and a first end of the overvoltage protection device is connected to a control end of the controllable switching element of the second driving module.
Preferably, the overvoltage protection device is a breakdown diode.
Preferably, the overvoltage protection device is composed of a plurality of breakdown diodes connected in series.
Preferably, the controllable switching device on the second driving module is a second controllable switching device, a first end of the second controllable switching device is connected to a second end of the overvoltage protection device, a second end of the second controllable switching device is connected to a first end of the second magnetic coil, and a second end of the second magnetic coil is connected to the discharge resistor.
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 is a second node, and a second end of the second magnetic coil is connected to the second node.
Preferably, the controllable switch device on the first driving module is a first controllable switch device, the first driving module further includes a second energy storage capacitor, the second end of the first magnetic coil is respectively connected with the anode of the second energy storage capacitor and the anode of the self-powered power supply, the first end of the first magnetic coil is connected with the second end of the first controllable switch device, the second end of the first controllable switch device and the cathode of the second energy storage capacitor are respectively connected with the cathode of the self-powered power supply, and the control end of the first controllable switch device is connected with the controller.
Preferably, the number of controllable switching devices on the second driving module is one.
Preferably, the number of the controllable switching devices on the second driving module is multiple, and the multiple controllable switching devices are connected in series.
The invention also provides flexible direct current transmission which comprises the power module overvoltage preventing circuit of the converter valve.
According to the technical scheme, the embodiment of the invention has the following advantages:
1. the power module of the converter valve prevents the voltage passing circuit from providing 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 continuous charging of the first energy storage capacitor under the current of the bridge arm is an inevitable process, and after the threshold value is reached, the passive overvoltage trigger unit is adopted to trigger and conduct the controllable switch device on the second driving module, so that the controllable switch device on the second driving module is not controlled by the controller, and the electric energy stored by the first energy storage capacitor provides electric energy for the second magnetic coil to drive the bypass switch, the closing of the bypass switch is realized, 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 technical problems that the existing converter valve for flexible direct-current power transmission has potential safety hazards, and the reliability and the safety performance of the flexible direct-current power transmission are low;
2. according to the flexible direct current power transmission, the power module overvoltage prevention circuit of the converter valve can still realize the closing of the bypass switch after the self-energy-taking power supply and/or the controller have faults, and the power module and the converter valve on the flexible direct current power transmission are protected, so that the reliability and the safety of the flexible direct current power transmission are improved, and the problems that the existing converter valve of the flexible direct current power transmission has potential safety hazards, 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 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 only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a block diagram of an overvoltage protection circuit for a power module of a converter valve according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a first embodiment of an overvoltage protection circuit for a power module of a converter valve according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a second embodiment of an overvoltage protection circuit for a power module of a converter valve according to an embodiment of the present invention.
Fig. 4 is a circuit schematic diagram of a third embodiment of an overvoltage protection circuit for a power module of a converter valve according to an embodiment of the present invention.
Fig. 5 is a schematic circuit diagram of a fourth embodiment of an overvoltage protection circuit for a power module of a 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 technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In a specific embodiment of the present invention, the described bypass switch K may be a mechanical magnetic switch, and the described combination of fully-controlled switch elements 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-Over 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.
Fig. 7 is a schematic structural diagram of a converter valve power module driving bypass switch in existing flexible direct current power transmission. The combination of the fully-controlled switch elements on the power module in the structural schematic diagram is a full-bridge sub-module connection structure.
As shown in fig. 7, the conventional power module includes a driving circuit for driving the bypass switch K to be closed, the bypass switch K is provided with a first magnetic coil L1, the driving circuit includes a second energy-storage capacitor C2, a first controllable switch device T1 and a controller, a first end of the first magnetic coil L1 is connected to a second end of the first controllable switch device T1, a second end of the first 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, a second end of the first controllable switch 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 switch device T1 is connected to the controller. The self-energy-taking power supply Vc supplies power to the second energy-storage capacitor C2. The first controllable switch device T1 is a thyristor for triggering, when a power module of the converter valve in power flexible direct current transmission fails, the controller controls the first controllable switch device T1 to trigger and conduct, the second energy storage capacitor C2 is forced to discharge electricity to the first magnetic coil L1, and the first magnetic coil L1 generates magnetic force to drive the bypass switch K to be closed. Therefore, when the bypass switch K is closed, which requires the second energy storage capacitor C2 to have stored electric energy and the first controllable switch device T1 to be turned on, the bypass switch K is closed. If the self-energy-taking power supply Vc or the controller in the power module fails, the first controllable switch device T1 is triggered to be conducted or the second energy storage capacitor C2 does not store electric energy, the bypass switch K will generate refusal action, and after refusal action, the first energy storage capacitor C1 will be continuously charged under the current of a bridge arm in the power module due to the one-way conductivity of a diode in the fully-controlled switch element combination S, even the voltage withstanding value is exceeded, and breakdown discharge, explosion rupture and the like are generated, so that the safety of flexible direct-current transmission is seriously threatened. The self-energy-taking power supply Vc and the controller belong to secondary components with high complexity in a power module in the converter valve, and the fault probability of the self-energy-taking power supply Vc and the controller is relatively higher than that of primary components of fully-controlled switch element combinations, capacitors and resistance electric energy of the power module in other converter valves, so that the problems belong to non-negligible safety risk points in the power module in the converter valve.
The embodiment of the application provides an overvoltage protection circuit for a power module of a flexible direct-current power transmission and a converter valve, which is applied to the flexible direct-current power transmission and is used for solving the technical problems that the existing converter valve of the flexible direct-current power transmission has potential safety hazards, so that the reliability of the flexible direct-current power transmission is low and the safety performance is poor.
The embodiment of the invention provides an overvoltage preventing circuit of a power module of a converter valve, which is applied to flexible direct-current transmission, wherein the power module of the converter valve in the flexible direct-current transmission comprises a bypass switch K, a full-control switch element combination S, a first energy storage capacitor C1, a discharge resistor and a self-energy-taking power supply Vc. Fig. 1 is a block diagram of an overvoltage protection circuit for a power module of a converter valve according to an embodiment of the present invention.
The first embodiment is as follows:
as shown in fig. 1, an embodiment of the present invention provides a power module overvoltage protection circuit for a converter valve, which includes a first driving module 10 and a second driving module 20 connected in parallel to the first driving module 10:
the first 10 and second 20 drive modules each comprise a controllable switching device T,
the bypass switch K is provided with a first magnetic coil L1 and a second magnetic coil L2 which respectively correspond to the first driving module 10 and the second driving module 20, and the first magnetic coil L1 and the second magnetic coil L2 are both used for driving the bypass switch to be closed;
the second driving module 20 further comprises a passive overvoltage triggering unit 21 for triggering the controllable switching device T in the second driving module 20 to conduct.
The first magnetic coil L1 and the second magnetic coil L2 are juxtaposed with reference to the direction of the view of fig. 1.
The overvoltage-preventing circuit of the power module of the converter valve provided by the invention provides a power supply for the bypass switch through the first energy-storing capacitor to realize closing, and does not depend on energy supply from an 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 current of a bridge arm, and after the threshold value is reached, the passive overvoltage trigger unit is adopted to trigger and conduct the controllable switch device on the second driving module, so that the controllable switch device on the second driving module is not controlled by the controller, and the electric energy stored by the first energy storage capacitor provides electric energy for the second magnetic coil to drive the bypass switch, the bypass switch is closed, the situation 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 existing converter valve for flexible direct-current power transmission has potential safety hazards, the reliability of the flexible direct-current power transmission is low, and the safety performance is poor are solved.
As shown in fig. 2, fig. 2 is a schematic circuit diagram of a first embodiment of an overvoltage protection circuit for a power module of a converter valve according to an embodiment of the present invention.
The passive overvoltage trigger unit 21 in the embodiment of the present invention 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 a series connection point of the third resistor R3 and the fourth resistor R4 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 controllable switching element T of the second driving module 20.
The controllable switching device T on the second driving module 20 in the embodiment of the present invention is the second controllable switching device T2, a first terminal of the second controllable switching device T2 is connected to a second terminal of the first overvoltage protection device BOD1, a second terminal of the second controllable switching device T2 is connected to a first terminal of the second magnetic coil L2, and a second terminal of the second magnetic coil L2 is connected to the discharge resistor.
The discharge resistor in the embodiment of the invention comprises a first resistor R1 and a second resistor R2 connected in series with the first resistor R1, a series connection point of the first resistor R1 and the second resistor R2 is a second node B, and a second end of the second magnetic coil L2 is connected with the second node B.
It should be noted that the first resistor R1 is used to limit the current that the first energy-storing capacitor C1 discharges to the second magnetic coil L2 after the second controllable switch device T2 is triggered to conduct, and the resistance of the first resistor R1 may be determined according to the current required by the bypass switch K to drive. The second resistor R2 is high in resistance value and used for limiting the loop current of the power module in the converter valve during normal operation, and meanwhile the second resistor R2 and the first resistor R1 are connected in series to form a discharge resistor of the power module. The values of the first energy storage capacitor C1 and the second controllable switching device T2 are different from each other in different engineering, so the parameter of the third resistor R3 cannot be determined in the present invention, but the principle and the function are the same. Such as: the first resistor R1 is used to limit the current of the second magnetic coil L2 to tens of A, so the resistance of the first resistor R1 can be 100-200 Ω. The second resistor R2 is high in resistance value and used for limiting the current of a power module in the converter valve during normal operation, and the resistance value of the second resistor R2 can be 20 k-50 k omega. The third resistor R3 is used to limit the trigger current when the second controllable switch device T2 is triggered to conduct, and the trigger current is usually tens of mA, so the resistance of the third resistor R3 may be 50 k-100 k Ω. The fourth resistor R4 has a high resistance value and is used for limiting the loop current of the power module in the converter valve during normal operation, and the resistance value of the fourth resistor R4 may be not less than 100k Ω.
In the embodiment of the present invention, the controllable switch device T on the first driving module 10 is a first controllable switch device T1, the first driving module 10 further includes a second energy-storage capacitor C2, a second end of the first magnetic coil L1 is connected to an anode of the second energy-storage capacitor C2 and an anode of the self-powered power supply Vc, a first end of the first magnetic coil L1 is connected to a second end of the first controllable switch device T1, a second end of the first controllable switch device T1 and a cathode of the second energy-storage capacitor C2 are connected to a cathode of the self-powered power supply Vc, and a control end of the first controllable switch device T1 is connected to the controller. The controller is connected with a self-energy-taking power supply Vc, and the self-energy-taking power supply Vc supplies power to the controller.
It should be noted that, when the power module of the converter valve in the flexible dc power transmission is normal, the self-energy-taking power source Vc supplies power to the second energy-storage capacitor C2, and the controller controls the first controllable switch device T1 to trigger and conduct, so as to implement normal operation of the first driving module 10. The operating principle of the second power module 20 of the present invention is: when the bypass switch K cannot be closed after the self-energy-taking power source Vc of the power module on the converter valve or the controller fails in the flexible direct-current transmission, the first energy-storage capacitor C1 is continuously charged under the bridge arm current of the converter valve, when the voltage of the first energy-storage capacitor C1 reaches a certain threshold (generally, below the combined withstand voltage value of the fully-controlled switch elements in the power module, and different projects can be adjusted according to the withstand voltage value of the primary component), the first overvoltage protection device BOD1 in the passive overvoltage trigger unit 21 is broken down, the first energy-storage capacitor C1 triggers and conducts the second controllable switch device T2 through the third resistor R3, after the second controllable switch device T2 triggers and conducts, the first energy-storage capacitor C1 discharges the second magnetic coil L2 through the first resistor R1, the second magnetic coil L2 generates magnetic force to close the bypass switch K, so that the bypass switch K can be closed without depending on the self-energy-taking power source, the power module overvoltage preventing circuit of the converter valve can still realize the closing of the bypass switch after the self-energy-taking power supply and/or the controller fails, and protects the power module and the converter valve in flexible direct-current power transmission, so that the reliability and the safety of the flexible direct-current power transmission are improved.
Example two:
as shown in fig. 3, fig. 3 is a schematic circuit diagram of a second embodiment of an overvoltage protection circuit for a power module of a 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 unit 21 comprises at least two overvoltage protection devices BOD connected in series. 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 overvoltage protection circuit of the power module of the converter valve in the second embodiment is the same as or similar to that of the first embodiment, and therefore, the overvoltage protection circuit 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 an overvoltage protection circuit for a power module of a 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 second driving module 20 includes at least two controllable switching devices T connected in series, in this embodiment, two controllable switching devices T connected in series are taken as an example for explanation, the two controllable switching devices T are respectively a third controllable switching device T3 and a fourth controllable switching device T4, and after being connected in series, the third controllable switching device T3 and the fourth controllable switching device T4 are respectively connected to the first end of the second magnetic coil T2 and the first end of the controllable switching device.
The working principle of the overvoltage protection circuit for the power module of the converter valve in the third embodiment is the same as or similar to that of the first embodiment, and therefore, the overvoltage protection circuit 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 an overvoltage protection circuit for a power module of a 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 unit 21 comprises at least two overvoltage protection devices BOD connected in series. 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 second driving module 20 includes at least two controllable switching devices T connected in series, and in this embodiment, two controllable switching devices T connected in series are taken as an example for explanation, the two controllable switching devices T are respectively a third controllable switching device T3 and a fourth controllable switching device T4, and after being connected in series, the third controllable switching device T3 and the fourth controllable switching device T4 are respectively connected to the first end of the second magnetic coil T2 and the first end of the controllable switching device.
The working principle of the overvoltage protection circuit for the power module of the converter valve in the fourth embodiment is the same as or similar to that in the first embodiment, and therefore, the overvoltage protection circuit is not illustrated in the first embodiment.
It should be noted that there may be a plurality of controllable switching devices T on the first power module 10.
Example five:
the invention provides flexible direct current transmission, which comprises the overvoltage preventing circuit of the power module of the converter valve.
According to the flexible direct-current transmission, the power module overvoltage prevention circuit of the converter valve can still realize the closing of the bypass switch after the self-energy-taking power supply and/or the controller have faults, and the power module and the converter valve in the flexible direct-current transmission are protected, so that the reliability and the safety of the flexible direct-current transmission are improved.
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 device (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: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The overvoltage preventing circuit for the power module of the converter valve is applied to flexible direct-current power transmission, and the power module of the converter valve in the flexible direct-current power transmission comprises a bypass switch, a full-control switch element combination, a first energy storage capacitor, a discharge resistor and a self-energy-obtaining power supply;
the first driving module and the second driving module both comprise controllable switching devices;
the bypass switch is provided with a first magnetic coil and a second magnetic coil which respectively correspond to the first driving module and the second driving module, and the first magnetic coil and the second magnetic coil are both used for driving the bypass switch to be closed;
the second driving module further comprises a passive overvoltage triggering unit for triggering the controllable switching device in the second driving module to be conducted.
2. The power module overvoltage protection circuit of a converter valve according to claim 1, wherein the passive overvoltage trigger unit comprises an 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 end of the overvoltage protection device is connected with the first node, and a first end of the overvoltage protection device is connected with a control end of the controllable switching element of the second driving module.
3. The power module overvoltage protection circuit for a converter valve of claim 2, wherein said overvoltage protection device is a breakdown diode.
4. The power module overvoltage protection circuit for a converter valve according to claim 2, wherein said overvoltage protection device is comprised of a plurality of breakdown diodes connected in series.
5. The power module overvoltage protection circuit of a converter valve according to claim 1, wherein the controllable switching device on the second driving module is a second controllable switching device, a first end of the second controllable switching device is connected to a second end of the overvoltage protection device, a second end of the second controllable switching device is connected to a first end of the second magnetic coil, and a second end of the second magnetic coil is connected to the discharge resistor.
6. The power module overvoltage protection circuit of a converter valve according to claim 5, wherein the discharge resistor comprises 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 is a second node, and a second end of the second magnetic coil is connected with the second node.
7. The overvoltage protection circuit for the power module of the converter valve according to claim 1, wherein the controllable switch device of the first driving module is a first controllable switch device, the first driving module further comprises a second energy storage capacitor, a second end of the first magnetic coil is connected to an anode of the second energy storage capacitor and an anode of the self-powered power supply, respectively, a first end of the first magnetic coil is connected to a second end of the first controllable switch device, a second end of the first controllable switch device and a cathode of the second energy storage capacitor are connected to a cathode of the self-powered power supply, respectively, and a control end of the first controllable switch device is connected to the controller.
8. Power module overvoltage protection circuit for a converter valve according to claim 1, characterized in that the number of controllable switching devices on the second driver module is one.
9. The power module overvoltage protection circuit for a converter valve according to claim 1, wherein the number of said controllable switching devices on said second driver module is plural, and a plurality of said controllable switching devices are connected in series.
10. A flexible direct current transmission characterized by a power module overvoltage protection circuit comprising a converter valve according to any of claims 1-9.
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