CN113300339B - Device and method for quickly recovering direct current short circuit fault of AC/DC converter - Google Patents
Device and method for quickly recovering direct current short circuit fault of AC/DC converter Download PDFInfo
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Classifications
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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 quickly recovering direct current short circuit faults of an AC/DC converter, wherein the device comprises the following components: the system comprises a central monitoring unit, a bipolar short circuit fault recovery unit, a direct current breaker unit and a resistance measuring unit, wherein: the first input end of the bipolar short-circuit fault recovery unit is connected to the positive electrode of the direct current bus, and the first output end of the bipolar short-circuit fault recovery unit is connected to the negative electrode 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 measuring unit is connected to the positive electrode of the direct current bus, and the first output end of the resistance measuring unit is connected to the negative electrode of the direct current bus; the second input end of the resistance measuring unit is connected to the third output end of the central monitoring unit, and the second output end of the resistance measuring unit is connected to the third input end 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 quickly recovering a direct current short circuit fault of an AC/DC converter.
Background
The energy crisis has prompted the rapid development of renewable distributed power generation. In order to reduce the impact of direct grid connection of distributed power sources on power quality, various distributed power generation devices are typically organically combined into a micro-grid, which is then incorporated into a main grid. Ac microgrids are currently the dominant form of microgrid, but the increase in dc load and the large-scale dc distributed power supply present a number of problems for ac microgrids. The direct-current load and the distributed power supply are directly connected into the direct-current micro-grid, so that the direct-current micro-grid has great advantages in terms of cost investment, electric energy quality, controllability and the like, the direct-current micro-grid can be flexibly controlled by means of a power electronic technology, and the advantages of the direct-current micro-grid are fully exerted.
However, unlike an ac power grid, dc power transmission and distribution has a "weak inertia" due to the system itself, so that dc faults propagate very fast, and especially, the problem of overcurrent caused by short-circuit faults seriously jeopardizes the operation of the system and the safety of equipment. Therefore, when the system has a direct current line short circuit fault, the fault needs to be removed efficiently, and the normal operation of the system is ensured.
In the direct current fault current limiting scheme in the prior art, a direct current fault current limiting device is formed by using two power semiconductor switching devices, a direct current capacitor, a current limiting reactor, an auxiliary switching circuit and a current limiting controller, so that fault current grading limiting and controlling functions are realized, and short circuit current is reduced.
Unlike ac power grids, dc power transmission and distribution has a "weak inertia" due to the system itself, and dc faults propagate very fast, especially the problem of over-current caused by short-circuit faults, which seriously jeopardizes the operation of the system and the safety of equipment. Therefore, when the system has a direct current line short circuit fault, the fault needs to be removed efficiently, and the normal operation of the system is ensured.
Disclosure of Invention
The invention aims to provide a device and a method for quickly 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 device for quickly recovering direct current short circuit faults of an AC/DC converter, which comprises the following components:
the system comprises a central monitoring unit, a bipolar short circuit fault recovery unit, a direct current breaker unit and a resistance measuring unit, wherein:
the first input end of the bipolar short-circuit fault recovery unit is connected to the positive electrode of the direct current bus, and the first output end of the bipolar short-circuit fault recovery unit is connected to the negative electrode 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 measuring unit is connected to the positive electrode of the direct current bus, and the first output end of the resistance measuring unit is connected to the negative electrode of the direct current bus; the second input end of the resistance measuring unit is connected to the third output end of the central monitoring unit, and the second output end of the resistance measuring unit is connected to the third input end of the central monitoring unit.
The invention provides a method for quickly recovering a direct current short circuit fault of an AC/DC converter, which comprises the following steps:
and step 1, when the central monitoring unit receives a bipolar short-circuit protection signal sent by the direct-current bus and breaks away the alternating-current breaker and the direct-current breaker, the central monitoring unit controls the internal elements of the bipolar short-circuit fault recovery unit, and sends a control signal to the bipolar short-circuit fault recovery unit to conduct the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor.
Step 2, collecting the voltages of the positive electrode and the negative electrode of the direct current bus in real time by adopting a voltage transformer, collecting the current flowing through the energy consumption resistor in real time by adopting a first current transformer, sending the collected voltage value and current value to a central monitoring unit, and releasing the energy storage 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 the step 4; otherwise, continuing to execute the step 2;
step 4, controlling the internal elements of the resistance measuring unit through the central monitoring unit, starting the resistance measuring circuit after the insulated gate bipolar transistor of the resistance measuring unit receives a closing signal of the central monitoring unit, and judging that the resistance measuring unit is a permanent fault if the resistance measuring circuit calculates that the resistance R is close to 0; if the resistance value R calculated by the resistance value measuring circuit is particularly large, judging that the fault is eliminated, and executing the step 5;
step 5, sending a closing signal to the alternating current side breaker through the central monitoring unit, rapidly completing the closing action after the alternating current side breaker receives the command of the central monitoring unit, sending a control signal to the insulated gate bipolar transistor through the central monitoring unit to enable the insulated gate bipolar transistor to be disconnected, and charging the capacitor by the alternating current system at the moment;
step 6, continuously collecting voltages between the positive and negative electrode buses in real time through a voltage transformer, and sending the collected voltage values to a central monitoring unit;
step 7, judging whether the voltage value is close to the interelectrode voltage of the bus in normal operation of the system or not through the central monitoring unit, and if the voltage value is close to the interelectrode voltage of the bus in normal operation of the system, executing step 9; otherwise, continuing to execute the step 5;
and 8, sending a closing signal to the direct current breaker through the central monitoring unit, and completing the closing action after the direct current breaker receives the signal, wherein the system is restored to normal operation at the moment.
By adopting the embodiment of the invention, when the bipolar short circuit fault of the direct current bus occurs, the energy storage can be quickly released, the damage of power electronic equipment and the operation accident of a power system can be prevented, and the purpose that the system can recover normal operation in a short time after the fault is achieved.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a rapid recovery device for DC short-circuit fault 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 AC/DC converter DC short-circuit fault quick recovery device according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a bipolar short-circuit quick recovery device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a resistance measurement unit according to an embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a signal conditioning circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a central monitoring unit circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of an operational amplifier circuit module according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of an F8500 operational amplifier assembly according to an embodiment of the invention;
FIG. 9 is a hardware block diagram of a resistance measuring unit according to an embodiment of the present invention;
fig. 10 is a flowchart of a method for fast recovery from a bipolar short circuit fault of a dc transmission line according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should 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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Furthermore, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Device embodiment
According to an embodiment of the present invention, there is provided a rapid recovery device for DC short-circuit fault of an AC/DC converter, and fig. 1 is a schematic diagram of the rapid recovery device for DC short-circuit fault of an AC/DC converter according to an embodiment of the present invention, as shown in fig. 1, the rapid recovery device for 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 dc breaker unit 14, and a resistance measuring unit 16, wherein:
the first input end of the bipolar short-circuit fault recovery unit 12 is connected to the positive electrode of the direct current bus, and the first output end of the bipolar short-circuit fault recovery unit is connected to the negative electrode of the direct current bus; a second input end of the bipolar short-circuit fault recovery unit 12 is connected with a first output end of the central monitoring unit 10, and a second output end of the bipolar short-circuit fault recovery unit is connected with 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, the first input end of the resistance measuring unit 16 is connected to the positive electrode of the dc bus, and the first output end thereof is connected to the negative electrode of the dc bus; the second input of the resistance measuring unit 16 is connected to the third output of the central monitoring unit 10, and the second output thereof is connected to the third input of the central monitoring unit 10.
The bipolar short-circuit fault quick recovery unit specifically comprises: the direct-current capacitor, the first inductor, the second inductor, the third inductor, the fourth inductor, the first energy consumption resistor, the second energy consumption resistor, the third energy consumption resistor, the fourth energy consumption resistor, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor, the fourth insulated gate bipolar transistor, the voltage transformer and the first current transformer;
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 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 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 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 of a fourth insulated gate bipolar transistor, one end of the 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 end of the four energy consumption resistors is connected with an anode of the direct current bus as a first input end of a short-circuit recovery unit, the emitters of the four insulated gate bipolar transistors are connected with a first current transformer in series after being connected with the emitters of the direct current bus as a cathode of the short-circuit recovery unit, the first output end of the short-circuit recovery unit, the bases of the four insulated gate bipolar transistors are used as second input ends of the short-circuit recovery units, the voltage transformers are connected with the other ends of the direct current transformers at the anode of the two ends of the direct current buses and the second mutual transformers are connected with the first output ends of the direct current mutual transformers.
As shown in fig. 9, the resistance measuring unit 16 specifically includes: the circuit comprises an operational amplifier, a standard resistor, a direct current power supply and a fifth insulated gate bipolar transistor; wherein:
the fifth direct current power supply is connected with the collector and the emitter of the insulated gate bipolar transistor and is connected with the positive electrode of the direct current bus, one end of the standard resistor is connected with the negative electrode of the direct current bus, meanwhile, the other end of the standard resistor is directly grounded, the base electrode of the fifth insulated gate bipolar transistor is used as the first input end of the resistance value measuring unit 16, and the voltage of the negative electrode bus and the voltage of the negative electrode of the operational amplifier are used as the first output end of the resistance value measuring unit 16.
In the embodiment of the invention, the operational amplifier is: the schematic diagrams of the F8500 operational amplifier are shown in fig. 7 and 8. The voltage transformer adopts a model JDZ1-1, and the first current transformer adopts a model LMZD 2-10. The central monitoring unit 10 adopts TMS320VC5502 model.
The specific structure of the above-described device according to the embodiment of the present invention will be described and illustrated in detail 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 breaker and a resistance measuring unit. As shown in fig. 2, in the embodiment of the present invention, three-phase AC power is rectified into 750V DC power by an AC/DC converter, and then is transmitted through a DC transmission line for long distance transmission. The central monitoring unit adopts TMS320VC5502 model.
The first input end of the bipolar short-circuit fault recovery unit is connected with the positive electrode of the direct-current transmission line, and the first output end of the bipolar short-circuit fault recovery unit is connected with the negative electrode 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 measuring unit is connected to the positive electrode of the direct current bus; the first output end of the resistance measuring unit is connected to the negative electrode of the direct current bus; the second input end of the resistance measuring unit is connected to the third output end of the central monitoring unit; the second output end of the resistance measuring unit is connected to the third input end of the central monitoring unit.
In this embodiment, as shown in FIG. 3, a bipolar short-circuit fault recovery unit includes a first inductor L 1 Second inductance L 2 Third inductance L 3 Fourth inductance L 4 First energy consumption resistor R 1 A second energy consumption resistor R 2 Third energy consumption resistor R 3 Fourth energy consumption resistor R 4 First insulated gate bipolar transistor T 1 Second insulated gate bipolar transistor T 2 Third insulated gate bipolar transistor T 3 Fourth insulated gate bipolar transistor T 4 First voltage transformer PT 1 CT of the first current transformer 1 First direct-current capacitor C 1 . The voltage transformer adopts JDZ1-1 model, and the current transformer adopts LMZD2-10 model.
As shown in fig. 3, in the embodiment of the present invention, the first energy consumption resistor R 1 Is connected in series with a first inductor L 1 The first inductance L 1 Is connected with the other end of the first insulated gateBipolar transistor T 1 Is connected with the collector electrode; second energy consumption resistor R 2 Is connected in series with a second inductor L 2 The second inductance L 2 And the other end of the second insulated gate bipolar transistor T 2 Is connected with the collector electrode; third energy consumption resistor R 3 Is connected in series with a third inductor L 3 The third inductance L 3 And the other end of the third insulated gate bipolar transistor T 4 Is connected with the collector electrode; fourth energy consumption resistor R 4 Is connected in series with a fourth inductor L 4 The fourth inductance L 4 And the other end of the fourth insulated gate bipolar transistor T 4 Is connected with the collector electrode; the first insulated gate bipolar transistor T 1 Emitter of (a) second insulated gate bipolar transistor T 2 Emitter of (c) and third insulated gate bipolar transistor T 3 Emitter of (c) and fourth insulated gate bipolar transistor T 4 The emitters of the (C) are commonly connected and then serve as a first output end of the bipolar short-circuit fault recovery unit. First energy consumption resistor R 1 And a second energy consumption resistor R 2 And the other end, the third energy consumption resistor R 3 And a fourth energy consumption resistor R 4 The other end of the first and second input terminals are commonly connected as a first input terminal of a bipolar short-circuit fault recovery unit.
The first insulated gate bipolar transistor T 1 Base of (a) second insulated gate bipolar transistor T 2 Base electrode of (c) and third insulated gate bipolar transistor T 3 Base of (c) and fourth insulated gate bipolar transistor T 4 The base of which serves as the second input of the bipolar short recovery unit.
The voltage transformer PT 1 One end is connected with the positive electrode of the direct current bus, and the other end is connected with the negative electrode of the direct current bus. Voltage transformer PT 1 And a first current transformer CT 1 As a second output of the bipolar short recovery unit.
FIG. 5 is a schematic diagram of a signal conditioning circuit, in an example of the present invention, three signal conditioning diagrams are included, and have the same structure, and input ends U/I of the three signal conditioning diagrams are respectively connected with an output end of a voltage transformer, an output end of a current transformer, and F8500 operational amplifierAnd (5) an outlet end. As shown in fig. 5, the three signal conditioning circuits are connected with an ADS174 type data acquisition chip, the ADS174 type data acquisition chip is connected with a TMS320VC5502 type DSP chip, wherein the output terminals AIPN and AINN of the signal conditioning circuits are sequentially connected with the AIPN1 and AINN1 terminals of the data acquisition chip; IOVDD, CLK of the data acquisition chip,SCLK, DOUT, MODE1 and MODE0 are respectively connected with DVDD, CLKOUT, mcBSP-PORT, GPI03 and GPI05 of TMS320F28335 model DSP chip.
In summary, compared with the traditional circuit, the device for quickly recovering the bipolar short circuit fault of the direct current circuit of the AC/DC converter, disclosed by the embodiment of the invention, has the advantages that the control is flexible, the circuit can be quickly, effectively and reliably opened and closed, the timely input or the withdrawal of the bipolar short circuit fault recovery unit is ensured, and the possibility of damage of other equipment such as a converter due to overcurrent and overvoltage is reduced. And the device has the advantages of simple structure, low cost and convenient use. In addition, in the direct current transmission process, the device can quickly recover normal operation after bipolar short circuit fault of the system, and ensure the reliability of power supply.
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, and fig. 10 is a flowchart of the method for quickly recovering a DC short-circuit fault of an AC/DC converter according to an embodiment of the present invention, as shown in fig. 10, where 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:
and step 1, when the central monitoring unit receives a bipolar short-circuit protection signal sent by the direct-current bus and breaks away the alternating-current breaker and the direct-current breaker, the central monitoring unit controls the internal elements of the bipolar short-circuit fault recovery unit, and sends a control signal to the bipolar short-circuit fault recovery unit to conduct the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor.
Step 2, collecting the voltages of the positive electrode and the negative electrode of the direct current bus in real time by adopting a voltage transformer, collecting the current flowing through the energy consumption resistor in real time by adopting a first current transformer, sending the collected voltage value and current value to a central monitoring unit, and releasing the energy storage 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 the step 4; otherwise, continuing to execute the step 2;
step 4, controlling the internal elements of the resistance measuring unit through the central monitoring unit, starting the resistance measuring circuit after the insulated gate bipolar transistor of the resistance measuring unit receives a closing signal of the central monitoring unit, and judging that the resistance measuring unit is a permanent fault if the resistance measuring circuit calculates that the resistance R is close to 0; if the resistance value R calculated by the resistance value measuring circuit is particularly large, judging that the fault is eliminated, and executing the step 5;
step 5, sending a closing signal to the alternating current side breaker through the central monitoring unit, rapidly completing the closing action after the alternating current side breaker receives the command of the central monitoring unit, sending a control signal to the insulated gate bipolar transistor through the central monitoring unit to enable the insulated gate bipolar transistor to be disconnected, and charging the capacitor by the alternating current system at the moment;
step 6, continuously collecting voltages between the positive and negative electrode buses in real time through a voltage transformer, and sending the collected voltage values to a central monitoring unit;
step 7, judging whether the voltage value is close to the interelectrode voltage of the bus in normal operation of the system or not through the central monitoring unit, and if the voltage value is close to the interelectrode voltage of the bus in normal operation of the system, executing step 9; otherwise, continuing to execute the step 5;
and 8, sending a closing signal to the direct current breaker through the central monitoring unit, and completing the closing action after the direct current breaker receives the signal, wherein the system is restored to normal operation at the moment.
The foregoing describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can 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 are also possible or may be advantageous.
In the 30 s of the 20 th century, improvements to one technology could clearly be distinguished as improvements in hardware (e.g., improvements to circuit structures such as diodes, transistors, switches, etc.) or software (improvements to the process flow). However, with the development of technology, many improvements of the current method flows can be regarded as direct improvements of hardware circuit structures. Designers almost always obtain corresponding hardware circuit structures by programming improved method flows into hardware circuits. Therefore, an improvement of a method flow cannot be said to be realized by a hardware entity module. For example, a programmable logic device (Programmable Logic Device, PLD) (e.g., field programmable gate array (Field Programmable Gate Array, FPGA)) is an integrated circuit whose logic function is determined by the programming of the device by a user. A designer programs to "integrate" a digital system onto a PLD without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Moreover, nowadays, instead of manually manufacturing integrated circuit chips, such programming is mostly implemented by using "logic compiler" software, which is similar to the software compiler used in program development and writing, and the original code before the compiling is also written in a specific programming language, which is called hardware description language (Hardware Description Language, HDL), but not just one of the hdds, but a plurality of kinds, such as ABEL (Advanced Boolean Expression Language), AHDL (Altera Hardware Description Language), confluence, CUPL (Cornell University Programming Language), HDCal, JHDL (Java Hardware Description Language), lava, lola, myHDL, PALASM, RHDL (Ruby Hardware Description Language), etc., VHDL (Very-High-Speed Integrated Circuit Hardware Description Language) and Verilog are currently most commonly used. It will also be apparent to those skilled in the art that a hardware circuit implementing the logic method flow can be readily obtained by merely slightly programming the method flow into an integrated circuit using several of 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, application specific integrated circuits (Application Specific Integrated Circuit, ASIC), programmable logic controllers, and embedded microcontrollers, 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 of the memory. Those skilled in the art will also appreciate that, in addition to implementing the controller in a pure computer readable program code, it is well possible to implement the same functionality by logically programming the method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc. Such a controller may thus be regarded as a kind of hardware component, and means for performing various functions included therein may also be regarded as structures within the hardware component. Or even means for achieving the various functions may be regarded as either software modules implementing the methods or structures within hardware components.
The system, apparatus, module or unit set forth in the above embodiments may be implemented in particular by a computer chip or entity, or by a product having a certain function. One typical implementation is a computer. In particular, the computer may be, for example, a personal computer, a laptop computer, a cellular telephone, a camera phone, a smart phone, 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 functionally divided into various units, respectively. Of course, the functions of each unit may be implemented in the same piece or pieces of software and/or hardware when implementing the embodiments of the present specification.
One skilled in the relevant 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 present description can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
The present description is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the specification. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
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 storage media for a computer 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, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
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 one … …" 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 specification 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.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing description is by way of example only and is not intended to limit the present disclosure. Various modifications and changes may occur to those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. that fall within the spirit and principles of the present document are intended to be included within the scope of the claims of the present document.
Claims (6)
1. The utility model provides an AC/DC converter direct current short circuit trouble quick recovery device which characterized in that includes: the system comprises a central monitoring unit, a bipolar short circuit fault recovery unit, a direct current breaker unit and a resistance measuring unit, wherein:
the first input end of the bipolar short-circuit fault recovery unit is connected to the positive electrode of the direct current bus, and the first output end of the bipolar short-circuit fault recovery unit is connected to the negative electrode 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, the second output end of the bipolar short-circuit fault recovery unit is connected with the first input end of the central monitoring unit, and the bipolar short-circuit fault quick recovery unit specifically comprises: the direct-current capacitor, the first inductor, the second inductor, the third inductor, the fourth inductor, the first energy consumption resistor, the second energy consumption resistor, the third energy consumption resistor, the fourth energy consumption resistor, the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor, the fourth insulated gate bipolar transistor, the voltage transformer and the first current transformer;
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 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 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 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 of a fourth insulated gate bipolar transistor, one end of the 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 end of the direct current capacitor is connected with an anode of the direct current bus, the emitters of the four insulated gate bipolar transistors are connected with a first current transformer in series after being connected with a first input end of the short-circuit recovery unit, and then connected with a cathode of the direct current bus as a first output end of the short-circuit recovery unit, the bases of the four insulated gate bipolar transistors are connected with a second input end of the direct current transformer as a short-circuit recovery unit, and the other ends of the direct current transformer and the second current transformer are connected with the second input end of the direct current transformer at the first output end of the short-circuit recovery unit and the second mutual inductor;
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 measuring unit is connected to the positive electrode of the direct current bus, and the first output end of the resistance measuring unit is connected to the negative electrode of the direct current bus; the second input end of the resistance measuring unit is connected to the third output end of the central monitoring unit, and the second output end of the resistance measuring unit is connected to the third input end of the central monitoring unit.
2. The apparatus according to claim 1, wherein the resistance measuring unit specifically includes: the circuit comprises an operational amplifier, a standard resistor, a direct current power supply and a fifth insulated gate bipolar transistor; wherein:
the collector and the emitter of the fifth insulated gate bipolar transistor are connected with the positive electrode of the direct current bus, one end of the standard resistor is connected with the negative electrode of the direct current bus, and meanwhile, the positive electrode of the operational amplifier is connected with the other end of the standard resistor, the base of the fifth insulated gate bipolar transistor is directly grounded, the base of the fifth insulated gate bipolar transistor is used as a first input end of the resistance measuring unit, and the voltage of the negative electrode bus and the voltage of the negative electrode of the operational amplifier are used as a first output end of the resistance measuring unit.
3. The apparatus of claim 2, wherein the operational amplifier is: f8500 operational amplifier.
4. The apparatus of claim 1, wherein the voltage transformer is model JDZ1-1 and the first current transformer is model LMZD 2-10.
5. The apparatus of claim 1, wherein the central monitoring unit is of model TMS320VC 5502.
6. A method for rapid recovery from a DC short-circuit fault in an AC/DC converter, characterized in that it is applied to a device according to any one of the preceding claims 1 to 5, said method comprising in particular:
step 1, when a central monitoring unit receives a bipolar short-circuit protection signal sent by a direct-current bus and breaks away an alternating-current breaker and a direct-current 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 conduct the first insulated gate bipolar transistor, the second insulated gate bipolar transistor, the third insulated gate bipolar transistor and the fourth insulated gate bipolar transistor;
step 2, collecting the voltages of the positive electrode and the negative electrode of the direct current bus in real time by adopting a voltage transformer, collecting the current flowing through the energy consumption resistor in real time by adopting a first current transformer, sending the collected voltage value and current value to a central monitoring unit, and releasing the energy storage 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 the step 4; otherwise, continuing to execute the step 2;
step 4, controlling the internal elements of the resistance measuring unit through the central monitoring unit, starting the resistance measuring circuit after the insulated gate bipolar transistor of the resistance measuring unit receives a closing signal of the central monitoring unit, and judging that the resistance measuring unit is a permanent fault if the resistance measuring circuit calculates that the resistance R is close to 0; if the resistance value R calculated by the resistance value measuring circuit is particularly large, judging that the fault is eliminated, and executing the step 5;
step 5, sending a closing signal to the alternating current side breaker through the central monitoring unit, rapidly completing the closing action after the alternating current side breaker receives the command of the central monitoring unit, sending a control signal to the insulated gate bipolar transistor through the central monitoring unit to enable the insulated gate bipolar transistor to be disconnected, and charging the capacitor by the alternating current system at the moment;
step 6, continuously collecting voltages between the positive and negative electrode buses in real time through a voltage transformer, and sending the collected voltage values to a central monitoring unit;
step 7, judging whether the voltage value is close to the interelectrode voltage of the bus in normal operation of the system or not through the central monitoring unit, and executing step 8 if the voltage value is close to the interelectrode voltage of the bus in normal operation of the system; otherwise, continuing to execute the step 5;
and 8, sending a closing signal to the direct current breaker through the central monitoring unit, and completing the closing action after the direct current breaker receives the signal, wherein the system is restored to normal operation at the moment.
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