CN110808606B - Overvoltage protection circuit for power module of flexible direct current transmission and converter valve - Google Patents
Overvoltage protection circuit for power module of flexible direct current transmission and converter valve Download PDFInfo
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- CN110808606B CN110808606B CN201911252860.3A CN201911252860A CN110808606B CN 110808606 B CN110808606 B CN 110808606B CN 201911252860 A CN201911252860 A CN 201911252860A CN 110808606 B CN110808606 B CN 110808606B
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Classifications
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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]
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Abstract
The embodiment of the application relates to a power module overvoltage protection 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 protection circuit of the converter valve comprises a first driving module and a second driving module; the first driving module and the second driving module both comprise controllable switch devices, and a bypass switch is provided with a first magnetic coil and a second magnetic coil; the second drive module further comprises a passive over-voltage trigger unit. When the self-energy-taking power supply or the controller fails, the bypass switch fails to be closed, the passive overvoltage triggering unit is adopted to trigger and conduct the controllable switching 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, the occurrence of the condition that the bypass switch fails to be closed after the self-energy-taking power supply or the controller fails is avoided, and therefore reliability and safety of flexible direct-current transmission are improved.
Description
Technical Field
The application relates to the technical field of flexible direct current transmission, in particular to a power module overvoltage protection circuit of a flexible direct current transmission and converter valve.
Background
Flexible dc power transmission is a new generation of dc power transmission technology that is similar in structure to high voltage dc power transmission, yet is composed of a converter station and a dc power transmission line (typically, a dc cable). [1] The high voltage direct current transmission (Voltage Source Converter based High Voltage Direct Current Transmission, VSC-HVDC) technology based on voltage source converters was proposed by Boon-Teck oi et al, university of McGill, canada, 1990, and is a novel power transmission technology based on voltage source converters, self-turn-off devices and Pulse Width Modulation (PWM) technology, which has the advantages of being able to supply power to a passive network, having no commutation failure, requiring no communication between converter stations, being easy to construct a multi-terminal direct current system, and the like.
The existing flexible direct current transmission engineering generally adopts a modularized multi-level topology as a basic structural form of a converter valve, wherein each bridge arm of the converter valve 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-stage control protection device at the ground potential only through a pair of optical fibers, and a working power supply of secondary elements such as a controller in the power module and a driving power supply of a 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 is powered from two ends of a capacitor of the power module.
When the primary and secondary elements in the power module fail to influence the normal operation of the power module, a bypass command is issued to the mechanical bypass switch by the power module controller to close the bypass switch, so that the power module is cut off from the series loop, and the converter valve can continue to maintain operation within the range of the redundant quantity of the power module. The closing of a mechanical bypass switch in the existing flexible direct current transmission needs to meet two conditions: the energy storage capacitor used for driving the switch to be closed in the mechanical bypass switch is sufficient in energy storage; 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 action, and current and voltage generated after refusal action can break through electronic devices such as IGBT devices and even can generate destructive consequences such as explosion and rupture, so that serious threat is generated to the safety of the converter valve, and the reliability of flexible direct current transmission is low and the safety performance is poor.
Therefore, in view of the above, how to improve the reliability and safety of the flexible dc power transmission is an important technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the application provides a power module overvoltage protection circuit of a flexible direct current transmission and converter valve, which is used for solving the technical problems of low reliability and poor safety performance of the flexible direct current transmission caused by potential safety hazards of the conventional flexible direct current transmission converter valve.
In order to achieve the above object, the embodiment of the present application provides the following technical solutions:
the power module overvoltage protection circuit of the converter valve is applied to flexible direct current transmission, the power module of the converter valve in the flexible direct current transmission 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 protection 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 are respectively corresponding 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 conduction of the controllable switching device in the second driving module.
Preferably, the passive overvoltage triggering unit comprises an overvoltage protection device, a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series, the serial connection point of the third resistor and the fourth resistor is a first node, the second end of the overvoltage protection device is connected with the first node, and the first end of the overvoltage protection device is connected with the 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 with a second end of the overvoltage protection device, a second end of the second controllable switching device is connected with a first end of the second magnetic coil, and a second end of the second magnetic coil is connected with the discharge resistor.
Preferably, the discharging resistor comprises a first resistor and a second resistor connected in series with the first resistor, a connection point of the first resistor and the second resistor in series is a second node, and a second end of the second magnetic coil is connected with the second node.
Preferably, the controllable switching device on the first driving module is a first controllable switching device, the first driving module further comprises a second energy storage capacitor, the second end of the first magnetic coil is connected with the positive electrode of the second energy storage capacitor and the positive electrode of the self-energy-taking power supply respectively, the first end of the first magnetic coil is connected with the second end of the first controllable switching device, the second end of the first controllable switching device and the negative electrode of the second energy storage capacitor are connected with the negative electrode of the self-energy-taking power supply respectively, and the control end of the first controllable switching 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 a plurality, and a plurality of the controllable switching devices are connected in series.
The application also provides a flexible direct current transmission circuit comprising the power module overvoltage protection circuit of the converter valve.
From the above technical solutions, the embodiment of the present application has the following advantages:
1. the power module overvoltage protection circuit of the converter valve provides a power supply for the bypass switch through the first energy storage capacitor to realize closing, and does not depend on the energy supply of the self-energy-taking power supply; when the self-energy-taking power supply or the controller fails, the bypass switch fails to be closed, the first energy storage capacitor is continuously charged under the bridge arm current, and after the threshold value is reached, the controllable switch device on the second driving module is triggered and conducted by adopting the passive overvoltage triggering unit, 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 occurrence of the condition of failure of closing the bypass switch after the self-energy-taking power supply or the controller fails is avoided, and the technical problems that the existing flexible direct current transmission converter valve has potential safety hazard, and low reliability and poor safety performance of the flexible direct current transmission are solved;
2. the overvoltage protection circuit of the power module of the flexible direct current transmission through the converter valve can still realize the closing of the bypass switch after the self-energy-taking power supply and/or the controller fail, and the power module and the converter valve on the flexible direct current transmission are protected, so that the reliability and the safety of the flexible direct current transmission are improved, and the problems of low reliability and poor safety performance of the flexible direct current transmission caused by potential safety hazards of the conventional converter valve for the flexible direct current transmission are solved.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a frame diagram of an overvoltage protection circuit for a power module of a converter valve according to an embodiment of the application.
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 application.
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 application.
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 application.
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 application.
Fig. 6 is a schematic structural diagram of a converter valve in conventional flexible dc power transmission.
Fig. 7 is a schematic structural diagram of a power module driving bypass switch of a converter valve in the conventional flexible direct current transmission.
Detailed Description
In order to make the objects, features and advantages of the present application more comprehensible, the technical solutions in the embodiments of the present application are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the specific embodiment of the application, the bypass switch K can be a mechanical magnetic switch, and the described fully-controlled switching element combination is a combination of fully-controlled switching elements such as IGBT, IEGT and IGCT. The described controllable switching device can be a thyristor, or can be other controllable devices such as IGBT, IEGT and the like which can realize triggering and opening. The overvoltage protection device is preferably a breakdown Diode (Break Over Diode).
Fig. 6 is a schematic structural diagram of a converter valve in conventional flexible dc power transmission.
As shown in fig. 6, a power module of a converter valve in the conventional 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 supply Vc. The bypass switch K is connected with the power input end, the bypass switch K is respectively connected with the first energy storage capacitor C1, the discharging 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 discharging resistor R are respectively connected with the self-energy-taking power supply Vc in parallel.
It should be noted that the fully-controlled switching element combination S may be a fully-controlled switching element connection structure in the half-bridge sub-module, or may be a fully-controlled switching element connection structure in the full-bridge sub-module, a fully-controlled switching element connection structure in the clamping sub-module, a fully-controlled switching element connection structure in the serial double sub-module, a fully-controlled switching element connection structure in the diode clamping sub-module, a fully-controlled switching element connection structure in the enhanced self-resistance sub-module, or the like. The connection structure of the fully controlled switching element described above has been disclosed in the national institute of electrical and electronics engineers of 2016, 4, 36 th edition, 8 th edition, 2114 to 2122 pages of research on key performance of MMC submodule with dc fault clearing capability.
Fig. 7 is a schematic structural diagram of a power module driving bypass switch of a converter valve in the conventional flexible direct current transmission. The full-control switch element combination on the power module in the structure schematic diagram is a full-bridge submodule connection structure.
As shown in fig. 7, the existing 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 switching device T1 and a controller, a first end of the first magnetic coil L1 is connected with a second end of the first controllable switching device T1, a second end of the first magnetic coil L1 is respectively connected with an anode of the second energy storage capacitor C2 and an anode of the self-power-taking power supply Vc, a second end of the first controllable switching device T1 is respectively connected with a cathode of the second energy storage capacitor C2 and a cathode of the self-power-taking power supply Vc, and a control end of the first controllable switching device T1 is connected with the controller. The self-energy-taking power supply Vc supplies electric energy to the second energy storage capacitor C2. The first controllable switching device T1 is a thyristor for triggering, when a power module of the converter valve in the flexible direct current power transmission fails, the controller controls the first controllable switching device T1 to trigger and conduct, the second energy storage capacitor C2 is forced to discharge 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, it is required that the second storage capacitor C2 has stored electric energy and the first controllable switching device T1 is turned on at the same time, the bypass switch K is closed. If the self-energy-taking power supply Vc or the controller in the power module fails, the triggering conduction of the first controllable switch device T1 or the second energy storage capacitor C2 does not store electric energy, the bypass switch K will generate refusal operation, after refusal operation, the first energy storage capacitor C1 will be continuously charged under the bridge arm current in the power module due to the unidirectional conduction of the diode in the full-control switch element combination S, even exceed the withstand voltage value, breakdown discharge, explosion rupture and the like are generated, and thus the safety of flexible direct current transmission is seriously threatened. Because the self-energy-taking power supply Vc and the controller belong to secondary components with higher complexity in the power module in the converter valve, the fault probability of the secondary components is relatively higher than that of the primary components of the fully-controlled switching element combination, the capacitor and the resistor of the power module in other converter valves, and therefore the problems belong to non-negligible safety risk points in the power module in the converter valve.
The embodiment of the application provides a power module overvoltage protection circuit of a flexible direct current transmission and a converter valve, which is applied to the flexible direct current transmission and is used for solving the technical problems of low reliability and poor safety performance of the flexible direct current transmission caused by potential safety hazards of the conventional converter valve of the flexible direct current transmission.
The embodiment of the application provides an overvoltage protection circuit of a power module of a converter valve, which is applied to flexible direct current transmission. Fig. 1 is a frame diagram of an overvoltage protection circuit for a power module of a converter valve according to an embodiment of the application.
Embodiment one:
as shown in fig. 1, the embodiment of the application provides a power module overvoltage protection circuit of a converter valve, which comprises a first driving module 10 and a second driving module 20 connected in parallel with the first driving module 10:
the first drive module 10 and the second drive module 20 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 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 view direction of fig. 1.
The overvoltage protection circuit of the power module of the converter valve provided by the application provides a power supply for the bypass switch through the first energy storage capacitor to realize closing without depending on the energy supply of a self-energy-taking power supply; when the self-energy-taking power supply or the controller fails, the bypass switch fails to be closed, the first energy storage capacitor is continuously charged under the bridge arm current, and after the threshold value is reached, the controllable switch device on the second driving module is triggered and conducted by the passive overvoltage triggering unit, 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 occurrence of the condition that the bypass switch fails to be closed after the self-energy-taking power supply or the controller fails is avoided, the technical problems that potential safety hazards exist in the existing flexible direct current transmission converter valve, the reliability of the flexible direct current transmission is low and the safety performance is poor are solved.
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 application.
The passive overvoltage triggering unit 21 in the embodiment of the present application includes a first overvoltage protection device BOD1, a third resistor R3 and a fourth resistor R4, where the third resistor R3 and the fourth resistor R4 are connected in series and the connection point of the series connection 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.
In the embodiment of the present application, the controllable switching device T on the second driving module 20 is a second controllable switching device T2, a first end of the second controllable switching device T2 is connected to a second end of the first overvoltage protection device BOD1, a second end of the second controllable switching device T2 is connected to a first end of the second magnetic coil L2, and a second end of the second magnetic coil L2 is connected to the discharge resistor.
The discharging resistor in the embodiment of the application comprises a first resistor R1 and a second resistor R2 connected in series with the first resistor R1, wherein the series connection point of the first resistor R1 and the second resistor R2 is a second node B, and the second end of the second magnetic coil L2 is connected with the second node B.
It should be noted that, after the first resistor R1 is used to limit the current magnitude of the first storage capacitor C1 discharging to the second magnetic coil L2 after the second controllable switch device T2 is triggered and turned on, the resistance value of the first resistor R1 may be determined according to the current magnitude required for driving the bypass switch K. The second resistor R2 takes a high resistance value and is used for limiting the loop current of the power module in the converter valve in normal operation, and meanwhile, the second resistor R2 is also connected with the first resistor R1 in series to form a discharge resistor of the power module. The values of the first energy storage capacitor C1 and the second controllable switch device T2 are different from each other in different engineering, so that the parameter of the third resistor R3 cannot be determined in the present application, 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 several tens a, so the resistance of the first resistor R1 may have a resistance value of 100 to 200Ω. The second resistor R2 takes a high resistance value and is used for limiting the current of the power module in the converter valve in normal operation, and the resistance of the second resistor R2 can be 20 k-50 k omega. The third resistor R3 is used to limit the magnitude of the trigger current when the second controllable switch device T2 is triggered to be turned on, and the trigger current is typically tens of mA, so the resistance of the third resistor R3 may be 50k to 100kΩ. The fourth resistor R4 takes a high resistance value and is used for limiting the loop current of the power module in the converter valve in normal operation, and the resistance of the fourth resistor R4 can be not less than 100kΩ.
In the embodiment of the present application, the controllable switching device T on the first driving module 10 is a first controllable switching device T1, the first driving module 10 further includes a second energy storage capacitor C2, the second end of the first magnetic coil L1 is connected to the positive electrode of the second energy storage capacitor C2 and the positive electrode of the self-energy-taking power supply Vc, the first end of the first magnetic coil L1 is connected to the second end of the first controllable switching device T1, the second end of the first controllable switching device T1 and the negative electrode of the second energy storage capacitor C2 are connected to the negative electrode of the self-energy-taking power supply Vc, and the control end of the first controllable switching device T1 is connected to the controller. The controller is connected with a self-energy-taking power supply Vc which supplies power to the controller.
It should be noted that, when the self-energy-taking power supply Vc of the power module on the converter valve and the controller are normal in the flexible dc power transmission, the self-energy-taking power supply Vc supplies power to the second energy storage capacitor C2, and the controller controls the first controllable switching device T1 to trigger and conduct, so as to realize normal operation of the first driving module 10. The second power module 20 of the present application operates on the following principle: when the self-energy-taking power supply Vc or the controller of the power module on the converter valve fails in the flexible direct-current transmission, the bypass switch K can not be closed, 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 switching element in the power module, different projects can be adjusted according to the withstand voltage value of a primary component), the first overvoltage protection device BOD1 in the passive overvoltage triggering unit 21 is broken down, the first energy storage capacitor C1 realizes the triggering conduction of the second controllable switching device T2 through the third resistor R3, the second controllable switching device T2 discharges the second magnetic coil L2 through the first resistor R1 after the triggering conduction, and the second magnetic coil L2 generates magnetic force to enable the bypass switch K to be closed, so that the bypass switch K can be closed independently of the self-energy-taking power supply, the power module overvoltage protection circuit of the converter valve can still realize the closing of the bypass switch after the self-energy-taking power supply and the controller fails, and the flexible direct-current transmission valve can still be closed, and the safety and the power transmission reliability of the flexible direct-current transmission valve can be improved.
Embodiment two:
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 application.
The working principle of the second embodiment and the first embodiment is the same, except that the passive overvoltage triggering unit 21 comprises at least two overvoltage protection devices BOD connected in series. In this embodiment, two overvoltage protection devices BOD connected in series are taken as an example to describe, the two overvoltage protection devices BOD1 are a first overvoltage protection device BOD1 and a second overvoltage protection device BOD2, and the first overvoltage protection device BOD1 and the second overvoltage protection device BOD2 are connected in series and then are connected with the control ends of the first node a and the second controllable switch 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 description of the overvoltage protection circuit in this embodiment is omitted.
Embodiment III:
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 application.
The working principle of the third embodiment is the same as that of the first embodiment, except that 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 are illustrated by taking two controllable switching devices T connected in series as a case, and the two controllable switching devices T are a third controllable switching device T3 and a fourth controllable switching device T4, where the third controllable switching device T3 and the fourth controllable switching device T4 are connected in series and then connected to the first end of the second magnetic coil T2 and the first end of the controllable switching device, respectively.
The working principle of the overvoltage protection circuit of 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 description of the overvoltage protection circuit in this embodiment is omitted.
Embodiment four:
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 application.
The working principle of the fourth embodiment is the same as that of the first embodiment, except that the passive overvoltage triggering unit 21 comprises at least two overvoltage protection devices BOD connected in series. In this embodiment, two overvoltage protection devices BOD connected in series are taken as an example to describe, the two overvoltage protection devices BOD1 are a first overvoltage protection device BOD1 and a second overvoltage protection device BOD2, and the first overvoltage protection device BOD1 and the second overvoltage protection device BOD2 are connected in series and then are connected with the control ends of the first node a and the second controllable switch 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 are illustrated as a case, where the two controllable switching devices T are a third controllable switching device T3 and a fourth controllable switching device T4, and the third controllable switching device T3 is connected in series with the fourth controllable switching device T4 and then is connected to the first end of the second magnetic coil T2 and the first end of the controllable switching device, respectively.
The working principle of the overvoltage protection circuit of the power module of the converter valve in the fourth embodiment is the same as or similar to that of the first embodiment, and therefore, the description of the overvoltage protection circuit in this embodiment is omitted.
It should be noted that the number of controllable switching devices T on the first power module 10 may be plural.
Fifth embodiment:
the application provides a flexible direct-current transmission, which comprises the power module overvoltage protection circuit of the converter valve.
The overvoltage protection circuit of the power module of the converter valve can still realize the closing of the bypass switch after the self-energy-taking power supply and/or the controller fail, and the power module and the converter valve on the flexible direct current transmission are protected, so that the reliability and the safety of the flexible direct current transmission are improved.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (6)
1. The power module overvoltage protection circuit of the converter valve is applied to flexible direct current transmission, and 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 is characterized by comprising a first driving module and a second driving module connected in parallel with the first driving module;
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 are respectively corresponding 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 conduction of a controllable switching device in the second driving module;
the passive overvoltage triggering unit comprises an overvoltage protection device, a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series, the serial connection point of the third resistor and the fourth resistor is a first node, the second end of the overvoltage protection device is connected with the first node, and the first end of the overvoltage protection device is connected with the control end of the controllable switch element of the second driving module;
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 with a second resistor of the discharge resistor, a second end of the second controllable switching device is connected with a first end of the second magnetic coil, and a second end of the second magnetic coil is connected with the discharge resistor;
the discharging resistor comprises a first resistor and a second resistor connected with the first resistor in series, the serial connection point of the first resistor and the second resistor is a second node, and the second end of the second magnetic coil is connected with the second node;
when the self-energy-taking power supply or the controller of the power module on the converter valve fails in the flexible direct current transmission, the bypass switch cannot be closed; the first energy storage capacitor is continuously charged under the bridge arm current of the converter valve, and when the voltage of the first energy storage capacitor reaches a certain threshold value, a first overvoltage protection device in the passive overvoltage triggering unit is broken down, and the first energy storage capacitor realizes the triggering and the conduction of the second controllable switching device through the third resistor; after the second controllable switching device is triggered and conducted, the first energy storage capacitor discharges the second magnetic coil through the first resistor, and the second magnetic coil generates magnetic force to enable the bypass switch to be closed;
the controllable switching device on the first driving module is a first controllable switching device, the first driving module further comprises a second energy storage capacitor, the second end of the first magnetic coil is respectively connected with the positive electrode of the second energy storage capacitor and the positive electrode of the self-energy-taking power supply, the first end of the first magnetic coil is connected with the second end of the first controllable switching device, the first end of the first controllable switching device and the negative electrode of the second energy storage capacitor are respectively connected with the negative electrode of the self-energy-taking power supply, and the control end of the first controllable switching device is connected with the controller;
the first end of the overvoltage protection device is an anode of the overvoltage protection device, the second end of the overvoltage protection device is a cathode of the overvoltage protection device, the first end of the controllable switching device is a cathode of the controllable switching device, the second end of the controllable switching device is an anode of the controllable switching device, and the control end of the controllable switching device is a control electrode of the controllable switching device.
2. The converter valve power module overvoltage protection circuit of claim 1, wherein said overvoltage protection device is a breakdown diode.
3. The converter valve power module overvoltage protection circuit of claim 1, wherein said overvoltage protection device is comprised of a plurality of breakdown diodes connected in series.
4. The power module overvoltage protection circuit of a converter valve according to claim 1, wherein the number of controllable switching devices on the second drive module is one.
5. The power module overvoltage protection circuit of a converter valve according to claim 1, wherein the number of said controllable switching devices on said second driving module is plural, and a plurality of said controllable switching devices are connected in series.
6. A flexible direct current transmission system, characterized by a power module overvoltage protection circuit comprising a converter valve according to any of claims 1-5.
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| CN113381595A (en) * | 2020-02-25 | 2021-09-10 | 南京南瑞继保电气有限公司 | MMC sub-module and bypass protection method thereof |
| CN111509756B (en) * | 2020-04-03 | 2022-11-25 | 清华大学 | High-order online energy taking device and method for hybrid converter |
| CN112858897B (en) * | 2021-01-06 | 2022-02-22 | 南方电网科学研究院有限责任公司 | Flexible direct current converter valve power module bypass switch through-flow test method and device |
| CN112858896B (en) * | 2021-01-06 | 2021-12-14 | 南方电网科学研究院有限责任公司 | Flexible direct current converter valve power module bypass switch false switching-on test method and device |
| CN117318458A (en) * | 2023-08-09 | 2023-12-29 | 许继电气股份有限公司 | Bypass device and method for IGCT-MMC power module |
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