CN113300339A - Device and method for rapidly recovering direct-current short-circuit fault of AC/DC converter - Google Patents
Device and method for rapidly recovering direct-current short-circuit fault of AC/DC converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00032—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for
- H02J13/00036—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers
- H02J13/0004—Systems characterised by the controlled or operated power network elements or equipment, the power network elements or equipment not otherwise provided for the elements or equipment being or involving switches, relays or circuit breakers involved in a protection system
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Abstract
The invention discloses a device and a method for rapidly recovering direct-current short-circuit fault of an AC/DC converter, wherein the device comprises: central monitoring unit, bipolar short-circuit fault recovery unit, direct current breaker unit, and resistance measurement unit, wherein: the first input end of the bipolar short-circuit fault recovery unit is connected to the positive pole of the direct-current bus, and the first output end of the bipolar short-circuit fault recovery unit is connected to the negative pole of the direct-current bus; the second input end of the bipolar short-circuit fault recovery unit is connected with the first output end of the central monitoring unit, and the second output end of the bipolar short-circuit fault recovery unit is connected with the first input end of the central monitoring unit; the first input end of the direct current breaker is connected with the second output end of the central monitoring unit, and the first output end of the direct current breaker is connected with the second input end of the central monitoring unit; the first input end of the resistance value measuring unit is connected to the positive pole of the direct current bus, and the first output end of the resistance value measuring unit is connected to the negative pole of the direct current bus; the second input terminal of the resistance value measuring unit is connected to the third output terminal of the central monitoring unit, and the second output terminal thereof is connected to the third input terminal of the central monitoring unit.
Description
Technical Field
The invention relates to the technical field of electricity, in particular to a device and a method for rapidly recovering direct-current short-circuit faults of an AC/DC converter.
Background
The energy crisis has prompted the rapid development of renewable distributed power generation. In order to reduce the influence of direct grid connection of distributed power supplies on the quality of electric energy, various distributed power generation devices are combined organically to form a micro grid and then are integrated into a main grid. The AC microgrid is a mainstream microgrid at present, but the increase of DC load and the scaling of DC distributed power supply bring many problems to the AC microgrid. The mode of directly connecting the direct current load and the distributed power supply into the direct current micro-grid has great advantages in the aspects of cost investment, electric energy quality, controllability and the like, the flexible control of the direct current micro-grid can be realized by means of the power electronic technology, and the advantages of the direct current micro-grid are fully exerted.
However, unlike the ac power grid, the dc power transmission and distribution system has "weak inertia", so that dc faults propagate very fast, especially the overcurrent problem caused by short-circuit faults, and the operation of the system and the equipment safety are seriously damaged. Therefore, when the system has a short-circuit fault of a direct-current line, the fault needs to be efficiently eliminated, and the system is ensured to recover normal operation.
In the direct current fault current limiting scheme in the prior art, a direct current fault current limiting device is formed by two power semiconductor switching devices, a direct current capacitor, a current limiting reactor, an auxiliary switching circuit and a current limiting controller, so that the fault current grading limitation and control functions are realized, and the short-circuit current is reduced.
Unlike AC power network, DC power transmission and distribution has weak inertia, so that DC fault is spread fast, and especially the over-current caused by short-circuit fault harms the operation and equipment safety of the system. Therefore, when the system has a short-circuit fault of a direct-current line, the fault needs to be efficiently eliminated, and the system is ensured to recover normal operation.
Disclosure of Invention
The invention aims to provide a device and a method for rapidly recovering a direct-current short-circuit fault of an AC/DC converter, and aims to solve the problems in the prior art.
The invention provides a quick recovery device for a direct-current short-circuit fault of an AC/DC converter, which comprises:
central monitoring unit, bipolar short-circuit fault recovery unit, direct current breaker unit to and resistance measuring unit, wherein:
the first input end of the bipolar short-circuit fault recovery unit is connected to the positive pole of the direct-current bus, and the first output end of the bipolar short-circuit fault recovery unit is connected to the negative pole of the direct-current bus; the second input end of the bipolar short-circuit fault recovery unit is connected with the first output end of the central monitoring unit, and the second output end of the bipolar short-circuit fault recovery unit is connected with the first input end of the central monitoring unit;
the first input end of the direct current breaker is connected with the second output end of the central monitoring unit, and the first output end of the direct current breaker is connected with the second input end of the central monitoring unit;
the first input end of the resistance value measuring unit is connected to the positive pole of the direct current bus, and the first output end of the resistance value measuring unit is connected to the negative pole of the direct current bus; and a second input end of the resistance value measuring unit is connected to a third output end of the central monitoring unit, and a second output end of the resistance value measuring unit is connected to a third input end of the central monitoring unit.
The invention provides a quick recovery method for a direct-current short-circuit fault of an AC/DC converter, which comprises the following steps:
step 1, when the central monitoring unit receives a bipolar short-circuit protection signal sent by a direct-current bus and trips an alternating-current circuit breaker and a direct-current circuit breaker, the central monitoring unit controls internal elements of a bipolar short-circuit fault recovery unit, and sends a control signal to the bipolar short-circuit fault recovery unit to a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor, and the bipolar short-circuit fault recovery unit is conducted.
step 3, judging whether the current value is zero or not through the central monitoring unit, and if the current value is zero, executing step 4; otherwise, continuing to execute the step 2;
step 4, controlling internal elements of the resistance value measuring unit through the central monitoring unit, starting the resistance value measuring circuit after the insulated gate bipolar transistor of the resistance value measuring unit receives a closing signal of the central monitoring unit, and judging as a permanent fault if the resistance value R calculated by the resistance value measuring circuit is close to 0; if the resistance value R calculated by the resistance value measuring circuit is particularly large, the fault is judged to be eliminated, and the step 5 is executed;
step 5, sending a closing signal to the alternating-current side circuit breaker through the central monitoring unit, rapidly completing a closing action after the alternating-current side circuit breaker receives an instruction of the central monitoring unit, sending a control signal to the bipolar short-circuit fault recovery unit through the central monitoring unit to the insulated gate bipolar transistor, and disconnecting the bipolar short-circuit fault recovery unit, wherein the alternating-current system charges the capacitor at the moment;
step 6, continuously collecting the voltage between the positive bus and the negative bus in real time through a voltage transformer, and sending the collected voltage value to a central monitoring unit;
step 7, judging whether the voltage value at the moment is close to the interelectrode voltage of the bus in the normal operation of the system or not through the central monitoring unit, and executing step 9 if the voltage value is close to the interelectrode voltage of the bus in the normal operation of the system; otherwise, continuing to execute the step 5;
and 8, sending a closing signal to the direct current circuit breaker through the central monitoring unit, finishing closing action after the direct current circuit breaker receives the signal, and recovering normal operation of the system at the moment.
By adopting the embodiment of the invention, when the bipolar short-circuit fault occurs in the direct-current bus, the capacitor energy storage can be quickly released, the power electronic equipment is prevented from being damaged and the operation accident of the power system occurs, and the purpose that the system can be recovered to normal operation in a short time after the fault is achieved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a DC short-circuit fault fast recovery device of an AC/DC converter according to an embodiment of the present invention;
FIG. 2 is a detailed schematic diagram of the access of the fast recovery device for the DC short-circuit fault of the AC/DC converter according to the embodiment of the invention;
FIG. 3 is a schematic circuit diagram of a bipolar short-circuit fast recovery device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a resistance measuring unit according to an embodiment of the present invention;
FIG. 5 is a circuit schematic of a signal conditioning circuit of an embodiment of the present invention;
FIG. 6 is a circuit schematic of a central monitoring unit of an embodiment of the present invention;
FIG. 7 is a schematic circuit diagram of an operational amplifier circuit module according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of the F8500 operational amplifier assembly according to an embodiment of the invention;
FIG. 9 is a hardware block diagram of a resistance measurement unit according to an embodiment of the present invention;
fig. 10 is a flowchart of a method for rapidly recovering a bipolar short-circuit fault of a direct-current transmission line according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. 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 the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Device embodiment
According to an embodiment of the present invention, a fast recovery apparatus for a DC short-circuit fault of an AC/DC converter is provided, fig. 1 is a schematic diagram of the fast recovery apparatus for a DC short-circuit fault of an AC/DC converter according to an embodiment of the present invention, and as shown in fig. 1, the fast recovery apparatus for a DC short-circuit fault of an AC/DC converter according to an embodiment of the present invention specifically includes:
a central monitoring unit 10, a bipolar short-circuit fault recovery unit 12, a direct current breaker unit 14, and a resistance value measurement unit 16, wherein:
a first input end of the bipolar short-circuit fault recovery unit 12 is connected to a positive electrode of the direct-current bus, and a first output end thereof is connected to a negative electrode of the direct-current bus; a second input end of the bipolar short-circuit fault recovery unit 12 is connected to a first output end of the central monitoring unit 10, and a second output end thereof is connected to a first input end of the central monitoring unit 10; the circuit principle of the central monitoring unit 10 is shown in fig. 6.
The first input end of the direct current breaker is connected with the second output end of the central monitoring unit 10, and the first output end of the direct current breaker is connected with the second input end of the central monitoring unit 10;
as shown in fig. 4, a first input end of the resistance value measuring unit 16 is connected to the positive pole of the dc bus, and a first output end thereof is connected to the negative pole of the dc bus; the resistance measuring unit 16 has a second input connected to the third output of the central monitoring unit 10, and a second output connected to the third input of the central monitoring unit 10.
The bipolar short-circuit fault quick recovery unit specifically comprises: the direct current power supply comprises a direct current capacitor, a first inductor, a second inductor, a third inductor, a fourth inductor, a first energy consumption resistor, a second energy consumption resistor, a third energy consumption resistor, a fourth energy consumption resistor, a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a voltage transformer and a first current transformer;
wherein, one end of the first energy consumption resistor is connected with a first inductor in series, the other end of the first inductor is connected with a collector electrode of a first insulated gate bipolar transistor, one end of the second energy consumption resistor is connected with a second inductor in series, the other end of the second inductor is connected with a collector electrode of a second insulated gate bipolar transistor, one end of the third energy consumption resistor is connected with a third inductor in series, the other end of the third inductor is connected with a collector electrode of a third insulated gate bipolar transistor, one end of the fourth energy consumption resistor is connected with a fourth inductor in series, the other end of the fourth inductor is connected with a collector electrode of a fourth insulated gate bipolar transistor, one end of a direct current capacitor is connected with an anode of a direct current bus, the other end of the direct current capacitor is connected with a cathode of the direct current bus, the other ends of the four energy consumption resistors are connected with an anode of the direct current bus and used as a first input end of a short circuit recovery unit, emitter electrodes of the four insulated gate bipolar transistors are connected and then connected with a first current transformer in series, and then the negative electrode of the direct current bus is connected as the first output end of the short circuit recovery unit, the bases of the four insulated gate bipolar transistors are used as the second input end of the short circuit recovery unit, one end of a voltage transformer is connected with the positive electrode of the direct current bus, the other end of the voltage transformer is connected with the negative electrode of the direct current bus, and the voltage transformer and the first current transformer are used as the second output end of the bipolar short circuit recovery unit.
As shown in fig. 9, the resistance value measuring unit 16 specifically includes: the operational amplifier, the standard resistor, the direct current power supply and the fifth insulated gate bipolar transistor; wherein:
the fifth direct-current power supply is connected with a collector electrode and an emitter electrode of the insulated gate bipolar transistor and an anode of the direct-current bus, one end of the standard resistor is connected with a cathode of the direct-current bus and is simultaneously connected with an anode of the operational amplifier, the other end of the standard resistor is directly grounded, a base electrode of the fifth insulated gate bipolar transistor serves as a first input end of the resistance value measuring unit 16, and a voltage of the cathode bus and a voltage of the cathode of the operational amplifier serve as a first output end of the resistance value measuring unit 16.
In an embodiment of the present invention, the operational amplifier is: f8500 operational amplifier, the schematic diagram of which is shown in FIG. 7 and FIG. 8. The voltage transformer adopts JDZ1-1 model, and the first current transformer adopts LMZD2-10 model. The central monitoring unit 10 is of a model TMS320VC 5502.
The detailed structure of the above-mentioned device according to the embodiment of the present invention will be described in detail and exemplified below with reference to the accompanying drawings.
As shown in fig. 1, the device comprises a central monitoring unit, a bipolar short-circuit fault recovery unit, a direct-current circuit breaker and a resistance value measuring unit. As shown in fig. 2, in the embodiment of the present invention, three-phase AC power is rectified into 750V DC power through an AC/DC converter, and then the power is transmitted remotely through a DC power transmission line. The central monitoring unit adopts a model TMS320VC 5502.
The first input end of the bipolar short-circuit fault recovery unit is connected with the anode of the direct-current transmission line, and the first output end of the bipolar short-circuit fault recovery unit is connected with the cathode of the direct-current transmission line; the second input end of the bipolar short-circuit fault recovery unit is connected with the output end of the central monitoring unit; the second output end of the bipolar short-circuit fault recovery unit is connected with the input end of the central monitoring unit; the first input end of the direct current breaker is connected with the second output end of the central monitoring unit; the first output end of the direct current breaker is connected with the second input end of the central monitoring unit; the first input end of the resistance value measuring unit is connected to the positive electrode of the direct current bus; the first output end of the resistance value measuring unit is connected to the negative electrode of the direct current bus; the second input end of the resistance value measuring unit is connected to the third output end of the central monitoring unit; the second output end of the resistance value measuring unit is connected to the third input end of the central monitoring unit.
In this embodiment, as shown in fig. 3, one bipolar short-circuit fault recovery unit includes a first inductor L1A second inductor L2A third inductor L3A fourth inductor L4A first energy consumption resistor R1A second energy consumption resistor R2The first stepThree-energy consumption resistor R3A fourth energy consumption resistor R4A first insulated gate bipolar transistor T1A second insulated gate bipolar transistor T2A third insulated gate bipolar transistor T3And a fourth insulated gate bipolar transistor T4A first voltage transformer PT1A first current transformer CT1A first DC capacitor C1. The voltage transformer is of a JDZ1-1 model, and the current transformer is of a LMZD2-10 model.
As shown in FIG. 3, in the embodiment of the present invention, the first energy consumption resistor R1One end of which is connected in series with a first inductor L1The first inductance L1And the other end of the first insulated gate bipolar transistor T1Is connected with the collector of the collector; second energy consumption resistor R2One end of which is connected in series with a second inductor L2Said second inductance L2And the other end of the first insulated gate bipolar transistor T2Is connected with the collector of the collector; third energy consumption resistor R3One end of which is connected in series with a third inductor L3Said third inductance L3And the other end of the first and second insulated gate bipolar transistors T4Is connected with the collector of the collector; fourth energy consumption resistor R4One end of which is connected in series with a fourth inductor L4Said fourth inductance L4And the other end of the first and second insulated gate bipolar transistors T4Is connected with the collector of the collector; the first insulated gate bipolar transistor T1Emitter electrode of, and second insulated gate bipolar transistor T2Emitter electrode of, and third insulated gate bipolar transistor T3Emitter electrode of, fourth insulated gate bipolar transistor T4And the emitters are connected together and then used as a first output end of the bipolar short-circuit fault recovery unit. First energy consumption resistor R1Another end of (3), a second energy consumption resistor R2Another end of (3), a third energy consumption resistor R3Another end of (3), a fourth energy consumption resistor R4And the other terminals of the first and second terminals are connected in common as a first input terminal of a bipolar short-circuit failure recovery unit.
The first insulated gate bipolar transistor T1Base electrode of the first insulated gate bipolar transistor T and the second insulated gate bipolar transistor T2Base electrode of the third insulated gate bipolar transistor T3Base electrode of the fourth insulated gate bipolar transistor T4As a second input terminal of the bipolar short-circuit recovery unit.
The voltage transformer PT1One end of the direct current bus is connected with the anode of the direct current bus, and the other end of the direct current bus is connected with the cathode of the direct current bus. Voltage transformer PT1And a first current transformer CT1As a second output terminal of the bipolar short recovery unit.
Fig. 5 is a schematic diagram of a signal conditioning circuit, which includes three signal conditioning diagrams with the same structure, in an embodiment of the present invention, input ends U/I of the three signal conditioning diagrams are respectively connected to an output end of a voltage transformer, an output end of a current transformer, and an output end of an F8500 operational amplifier. As shown in fig. 5, the three signal conditioning circuits are connected to an ADS174 type data acquisition chip, the ADS174 type data acquisition chip is connected to a TMS320VC5502 type DSP chip, wherein the output ends AIPN and AINN of the signal conditioning circuits are sequentially connected to the ends AIPN1 and AINN1 of the data acquisition chip; IOVDD, CLK, of the data acquisition chip,
SCLK, DOUT, MODE1, MODE0 are respectively connected to DVDD, CLKOUT, McBSP-PORT, GPI03, GPI05 of the DSP chip of model TMS320F 28335.
In summary, compared with the conventional circuit, the rapid recovery device for the bipolar short-circuit fault of the DC line of the AC/DC converter according to the embodiment of the present invention firstly uses the igbt control circuit, and is flexible in control, and can rapidly, effectively and reliably turn off the circuit, thereby ensuring that the bipolar short-circuit fault recovery unit is timely turned on or off, and reducing the possibility of damage to other devices such as the converter due to overcurrent and overvoltage. The device has simple structure, low cost and convenient use. In addition, in the direct-current power transmission process, the device can be used for rapidly recovering normal operation after bipolar short circuit faults occur in the system, and the reliability of power supply is ensured.
Method embodiment
According to an embodiment of the present invention, a method for quickly recovering a DC short-circuit fault of an AC/DC converter is provided, fig. 10 is a flowchart of a method for quickly recovering a DC short-circuit fault of an AC/DC converter according to an embodiment of the present invention, and as shown in fig. 10, the method for quickly recovering a DC short-circuit fault of an AC/DC converter according to an embodiment of the present invention specifically includes:
step 1, when the central monitoring unit receives a bipolar short-circuit protection signal sent by a direct-current bus and trips an alternating-current circuit breaker and a direct-current circuit breaker, the central monitoring unit controls internal elements of a bipolar short-circuit fault recovery unit, and sends a control signal to the bipolar short-circuit fault recovery unit to a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor, and the bipolar short-circuit fault recovery unit is conducted.
step 3, judging whether the current value is zero or not through the central monitoring unit, and if the current value is zero, executing step 4; otherwise, continuing to execute the step 2;
step 4, controlling internal elements of the resistance value measuring unit through the central monitoring unit, starting the resistance value measuring circuit after the insulated gate bipolar transistor of the resistance value measuring unit receives a closing signal of the central monitoring unit, and judging as a permanent fault if the resistance value R calculated by the resistance value measuring circuit is close to 0; if the resistance value R calculated by the resistance value measuring circuit is particularly large, the fault is judged to be eliminated, and the step 5 is executed;
step 5, sending a closing signal to the alternating-current side circuit breaker through the central monitoring unit, rapidly completing a closing action after the alternating-current side circuit breaker receives an instruction of the central monitoring unit, sending a control signal to the bipolar short-circuit fault recovery unit through the central monitoring unit to the insulated gate bipolar transistor, and disconnecting the bipolar short-circuit fault recovery unit, wherein the alternating-current system charges the capacitor at the moment;
step 6, continuously collecting the voltage between the positive bus and the negative bus in real time through a voltage transformer, and sending the collected voltage value to a central monitoring unit;
step 7, judging whether the voltage value at the moment is close to the interelectrode voltage of the bus in the normal operation of the system or not through the central monitoring unit, and executing step 9 if the voltage value is close to the interelectrode voltage of the bus in the normal operation of the system; otherwise, continuing to execute the step 5;
and 8, sending a closing signal to the direct current circuit breaker through the central monitoring unit, finishing closing action after the direct current circuit breaker receives the signal, and recovering normal operation of the system at the moment.
The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.
In the 30 s of the 20 th century, improvements in a technology could clearly be distinguished between improvements in hardware (e.g., improvements in circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements in process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain the corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Furthermore, nowadays, instead of manually making an Integrated Circuit chip, such Programming is often implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, but the original code before compiling is also written by a specific Programming Language, which is called Hardware Description Language (HDL), and HDL is not only one but many, such as abel (advanced Boolean Expression Language), ahdl (alternate Hardware Description Language), traffic, pl (core universal Programming Language), HDCal (jhdware Description Language), lang, Lola, HDL, laspam, hardward Description Language (vhr Description Language), vhal (Hardware Description Language), and vhigh-Language, which are currently used in most common. It will also be apparent to those skilled in the art that hardware circuitry that implements the logical method flows can be readily obtained by merely slightly programming the method flows into an integrated circuit using the hardware description languages described above.
The controller may be implemented in any suitable manner, for example, the controller may take the form of, for example, a microprocessor or processor and a computer-readable medium storing computer-readable program code (e.g., software or firmware) executable by the (micro) processor, logic gates, switches, an Application Specific Integrated Circuit (ASIC), a programmable logic controller, and an embedded microcontroller, examples of which include, but are not limited to, the following microcontrollers: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20, and Silicone Labs C8051F320, the memory controller may also be implemented as part of the control logic for the memory. Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may thus be considered a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The systems, devices, modules or units illustrated in the above embodiments may be implemented by a computer chip or an entity, or by a product with certain functions. One typical implementation device is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smartphone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in multiple software and/or hardware when implementing the embodiments of the present description.
One skilled in the art will recognize that one or more embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, one or more embodiments of the present description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the description may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The description has been presented with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the description. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
One or more embodiments of the present description may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. One or more embodiments of the specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above description is only an example of this document and is not intended to limit this document. Various modifications and changes may occur to those skilled in the art from this document. Any modifications, equivalents, improvements, etc. which come within the spirit and principle of the disclosure are intended to be included within the scope of the claims of this document.
Claims (7)
1. A quick recovery device for a direct current short circuit fault of an AC/DC converter is characterized by comprising: central monitoring unit, bipolar short-circuit fault recovery unit, direct current breaker unit to and resistance measuring unit, wherein:
the first input end of the bipolar short-circuit fault recovery unit is connected to the positive pole of the direct-current bus, and the first output end of the bipolar short-circuit fault recovery unit is connected to the negative pole of the direct-current bus; the second input end of the bipolar short-circuit fault recovery unit is connected with the first output end of the central monitoring unit, and the second output end of the bipolar short-circuit fault recovery unit is connected with the first input end of the central monitoring unit;
the first input end of the direct current breaker is connected with the second output end of the central monitoring unit, and the first output end of the direct current breaker is connected with the second input end of the central monitoring unit;
the first input end of the resistance value measuring unit is connected to the positive pole of the direct current bus, and the first output end of the resistance value measuring unit is connected to the negative pole of the direct current bus; and a second input end of the resistance value measuring unit is connected to a third output end of the central monitoring unit, and a second output end of the resistance value measuring unit is connected to a third input end of the central monitoring unit.
2. The device according to claim 1, wherein the bipolar short-circuit fault fast recovery unit comprises in particular: the direct current power supply comprises a direct current capacitor, a first inductor, a second inductor, a third inductor, a fourth inductor, a first energy consumption resistor, a second energy consumption resistor, a third energy consumption resistor, a fourth energy consumption resistor, a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor, a fourth insulated gate bipolar transistor, a voltage transformer and a first current transformer;
wherein, one end of the first energy consumption resistor is connected with a first inductor in series, the other end of the first inductor is connected with a collector electrode of a first insulated gate bipolar transistor, one end of the second energy consumption resistor is connected with a second inductor in series, the other end of the second inductor is connected with a collector electrode of a second insulated gate bipolar transistor, one end of the third energy consumption resistor is connected with a third inductor in series, the other end of the third inductor is connected with a collector electrode of a third insulated gate bipolar transistor, one end of the fourth energy consumption resistor is connected with a fourth inductor in series, the other end of the fourth inductor is connected with a collector electrode of a fourth insulated gate bipolar transistor, one end of a direct current capacitor is connected with an anode of a direct current bus, the other end of the direct current capacitor is connected with a cathode of the direct current bus, the other ends of the four energy consumption resistors are connected with an anode of the direct current bus and used as a first input end of a short circuit recovery unit, emitter electrodes of the four insulated gate bipolar transistors are connected and then connected with a first current transformer in series, and then the negative electrode of the direct current bus is connected as the first output end of the short circuit recovery unit, the bases of the four insulated gate bipolar transistors are used as the second input end of the short circuit recovery unit, one end of a voltage transformer is connected with the positive electrode of the direct current bus, the other end of the voltage transformer is connected with the negative electrode of the direct current bus, and the voltage transformer and the first current transformer are used as the second output end of the bipolar short circuit recovery unit.
3. The device according to claim 2, wherein the resistance value measuring unit specifically comprises: the operational amplifier, the standard resistor, the direct current power supply and the fifth insulated gate bipolar transistor; wherein:
the fifth direct-current power supply is connected with a collector electrode and an emitter electrode of the insulated gate bipolar transistor and an anode of the direct-current bus, one end of the standard resistor is connected with a cathode of the direct-current bus and is simultaneously connected with an anode of the operational amplifier, the other end of the standard resistor is directly grounded, a base electrode of the fifth insulated gate bipolar transistor serves as a first input end of the resistance value measuring unit, and a voltage of the cathode bus and a voltage of the cathode of the operational amplifier serve as a first output end of the resistance value measuring unit.
4. The apparatus of claim 3, wherein the operational amplifier is: f8500 operational amplifier.
5. The apparatus of claim 2, wherein the voltage transformer is model JDZ1-1 and the first current transformer is model LMZD 2-10.
6. The device of claim 1, wherein the central monitoring unit is a model TMS320VC 5502.
7. A method for fast recovery of an AC/DC converter DC short-circuit fault, characterized in that, when used in the apparatus of any one of the preceding claims 1 to 6, the method specifically comprises:
step 1, when the central monitoring unit receives a bipolar short-circuit protection signal sent by a direct-current bus and trips an alternating-current circuit breaker and a direct-current circuit breaker, the central monitoring unit controls internal elements of a bipolar short-circuit fault recovery unit, and sends a control signal to the bipolar short-circuit fault recovery unit to a first insulated gate bipolar transistor, a second insulated gate bipolar transistor, a third insulated gate bipolar transistor and a fourth insulated gate bipolar transistor, and the bipolar short-circuit fault recovery unit is conducted.
Step 2, acquiring the positive and negative voltages of the direct current bus in real time by adopting a voltage transformer, acquiring the current flowing through the energy consumption resistor in real time by adopting a first current transformer, transmitting the acquired voltage value and current value to a central monitoring unit, and releasing the stored energy of the capacitor through the energy consumption of the energy consumption resistor;
step 3, judging whether the current value is zero or not through the central monitoring unit, and if the current value is zero, executing step 4; otherwise, continuing to execute the step 2;
step 4, controlling internal elements of the resistance value measuring unit through the central monitoring unit, starting the resistance value measuring circuit after the insulated gate bipolar transistor of the resistance value measuring unit receives a closing signal of the central monitoring unit, and judging as a permanent fault if the resistance value R calculated by the resistance value measuring circuit is close to 0; if the resistance value R calculated by the resistance value measuring circuit is particularly large, the fault is judged to be eliminated, and the step 5 is executed;
step 5, sending a closing signal to the alternating-current side circuit breaker through the central monitoring unit, rapidly completing a closing action after the alternating-current side circuit breaker receives an instruction of the central monitoring unit, sending a control signal to the bipolar short-circuit fault recovery unit through the central monitoring unit to the insulated gate bipolar transistor, and disconnecting the bipolar short-circuit fault recovery unit, wherein the alternating-current system charges the capacitor at the moment;
step 6, continuously collecting the voltage between the positive bus and the negative bus in real time through a voltage transformer, and sending the collected voltage value to a central monitoring unit;
step 7, judging whether the voltage value at the moment is close to the interelectrode voltage of the bus in the normal operation of the system or not through the central monitoring unit, and executing step 9 if the voltage value is close to the interelectrode voltage of the bus in the normal operation of the system; otherwise, continuing to execute the step 5;
and 8, sending a closing signal to the direct current circuit breaker through the central monitoring unit, finishing closing action after the direct current circuit breaker receives the signal, and recovering normal operation of the system at the moment.
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