CN113315101B - Short-circuit fault recovery device and method - Google Patents
Short-circuit fault recovery device and method Download PDFInfo
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- CN113315101B CN113315101B CN202110589215.1A CN202110589215A CN113315101B CN 113315101 B CN113315101 B CN 113315101B CN 202110589215 A CN202110589215 A CN 202110589215A CN 113315101 B CN113315101 B CN 113315101B
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004146 energy storage Methods 0.000 claims abstract description 81
- 238000005265 energy consumption Methods 0.000 claims abstract description 67
- 238000009413 insulation Methods 0.000 claims abstract description 25
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/58—Testing of lines, cables or conductors
-
- 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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a short-circuit fault recovery device and a method, wherein the device specifically comprises the following steps: the protection module is used for inhibiting the current of the grid-connected port of the direct current power supply energy storage system from rising when a short circuit fault occurs in a bus of the direct current power supply energy storage system, preventing insulation and power electronic devices from being damaged, and judging the fault type of the bus; and the attempt recovery module is connected with the protection module by backing the direct current power supply energy storage system and is used for attempting to quickly recover power supply to the direct current power supply energy storage system according to the bus fault type after energy consumption is completed.
Description
Technical Field
The invention relates to the technical field of direct current short circuit protection and quick recovery, in particular to a short circuit fault recovery device and method.
Background
The rapid increase of load, the continuous improvement of the requirement of users on the quality of electric energy and the vigorous rise of new energy power generation lead to the higher technical requirements and challenges of the alternating current power distribution network. In contrast, the direct current power distribution system has high transmission efficiency, is easy to increase capacity, is beneficial to renewable energy sources and direct current load access, and can effectively solve the problems faced by the alternating current power distribution network.
The network architecture of the direct current power distribution system follows the basic principles of planning and construction of the power system, and under the typical application scene, a new energy source, a direct current load, an electric automobile, an energy storage device and the like are connected. But the probability of failure increases due to the large variety and number of distributed power sources. The energy storage system plays a role in stabilizing the voltage fluctuation of the power grid in the direct-current power distribution system, and when a short-circuit fault occurs in the energy storage system, the direct-current power distribution system is not greatly influenced due to the isolation effect of the power electronic transformer, and the serious overcurrent of the energy storage battery is caused. However, when a short circuit fault occurs in the direct current bus, the energy storage system discharges to a fault point together with the alternating current power grid. At the moment of failure, the capacitor discharge of the energy storage grid-connected port can cause the current of the energy storage system grid-connected port to suddenly rise. If not treated, too high currents for a short time will cause serious insulation damage to the grid-connected port and even to the DC/DC converter. Because of the self-restorability of the unknown bus fault, the traditional automatic reclosing device can possibly damage the direct current power supply system. Therefore, if the fault self-restorability can be rapidly and intelligently judged while the short-circuit fault current is limited, and then the alarm or closing operation is carried out, the safety and the stability of the system can be greatly improved.
Disclosure of Invention
The present invention is directed to a short-circuit fault recovery device and method, and aims to solve the above problems in the prior art.
The invention provides a short-circuit fault recovery device, which specifically comprises:
the protection module is used for inhibiting the current of the grid-connected port of the direct current power supply energy storage system from rising when a short circuit fault occurs in a bus of the direct current power supply energy storage system, preventing insulation and power electronic devices from being damaged, and judging the fault type of the bus;
and the attempt recovery module is connected with the protection module by backing the direct current power supply energy storage system and is used for attempting to quickly recover power supply to the direct current power supply energy storage system according to the bus fault type after energy consumption is completed.
The invention provides a short-circuit fault recovery method, which is used for the short-circuit fault recovery device, and specifically comprises the following steps:
when a short circuit fault occurs to a bus of the direct current power supply energy storage system through the protection module, the current of a grid-connected port of the direct current power supply energy storage system is restrained from rising, insulation and power electronic devices are prevented from being damaged, and the type of the bus fault is judged;
and after the energy consumption is completed through the try recovery module, aiming at the bus fault type, the direct current power supply energy storage system is tried to quickly recover power supply.
By adopting the embodiment of the invention, the short-circuit fault quick recovery device applied to the direct-current power supply energy storage system can inhibit the rise of the grid-connected port current of the energy storage system when the bus of the direct-current power supply system has short-circuit fault, prevent insulation and power electronic devices from being damaged, judge the type of the bus fault and realize the quick recovery of the direct-current power supply system.
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 short circuit fault recovery apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an installation structure of a short-circuit fault recovery device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second embodiment of a short-circuit fault recovery apparatus according to the present invention;
FIG. 4 is a schematic circuit diagram of a protection module energy dissipation loop according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an equivalent circuit for bus insulation detection in an embodiment of the present invention;
FIG. 6 is a schematic circuit diagram of a signal conditioning circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a controller circuit according to an embodiment of the invention;
FIG. 8 is a schematic diagram of an operational amplifier circuit module according to an embodiment of the present invention;
FIG. 9 is a diagram of the internal energy consumption circuit of the energy consuming circuit according to an embodiment of the present invention;
FIG. 10 is a flow chart of a short circuit fault recovery method of an embodiment of the present invention;
fig. 11 is a detailed flowchart of a short-circuit fault recovery method according to an embodiment of the present invention.
Detailed Description
In view of the damage to the power and energy storage system caused by the possible short circuit fault in the dc power supply system, the existing dc protection method has no problem for the energy storage system and the converter thereof. The embodiment of the invention provides a short-circuit fault quick recovery device and a short-circuit fault quick recovery method applied to an energy storage system. The power supply system comprises a power supply system, an energy storage grid-connected port, a power supply system and a power supply system. Specifically, the embodiment of the invention designs an automatic switching energy storage system, a protection module of an inverter of the automatic switching energy storage system and an attempt recovery module of a direct current power supply system. The protection module consists of a bus insulation detection device, an energy consumption loop and a control chip. The attempt recovery module is backed by the energy storage system and further comprises a control chip, an alarm device and a communication module.
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.
System embodiment
According to an embodiment of the present invention, a short-circuit fault recovery device is provided, which is used for a dc power supply energy storage system, and fig. 1 is a schematic diagram of the short-circuit fault recovery device according to the embodiment of the present invention, as shown in fig. 1, where the short-circuit fault recovery device according to the embodiment of the present invention specifically includes:
the protection module 10 is used for inhibiting the current of the grid-connected port of the direct current power supply energy storage system from rising when a short circuit fault occurs in a bus of the direct current power supply energy storage system, preventing insulation and power electronic devices from being damaged, and judging the fault type of the bus; the protection module 10 specifically includes:
the energy consumption loop is characterized in that a first input end of the energy consumption loop is connected to an output positive electrode of the grid-connected converter of the direct current power supply energy storage system, a first output end of the energy consumption loop is connected to an output negative electrode of the grid-connected converter of the direct current power supply energy storage system, a second input end of the energy consumption loop is connected to a second output end of the controller of the attempt recovery module, and a second output end of the energy consumption loop is connected to a first input end of the controller of the attempt recovery module and is used for inhibiting current of a grid-connected port of the direct current power supply energy storage system from rising when a bus of the direct current power supply energy storage system has a short circuit fault, so that insulation and damage to power electronic devices are prevented; the energy consumption loop specifically comprises:
the energy-saving circuit comprises a current transformer, an inductor, an energy consumption resistor, a voltage transformer, a first insulated gate bipolar transistor, a second insulated gate bipolar transistor and a third insulated gate bipolar transistor, wherein a collector of the first insulated gate bipolar transistor is used as a first input end of an energy consumption loop, an emitter of the first insulated gate bipolar transistor is simultaneously connected with one end of the inductor, the voltage transformer and one end of the energy consumption resistor, the other end of the inductor is simultaneously connected with the other end of the voltage transformer and one end of the current transformer, the other end of the current transformer is connected with the collector of the second insulated gate bipolar transistor, the other end of the energy consumption resistor is connected with the collector of the third insulated gate bipolar transistor, and an emitter of the second insulated gate bipolar transistor and the emitter of the third insulated gate bipolar transistor are connected to be used as a first output end of the energy consumption loop; the base electrode of the first insulated gate bipolar transistor, the base electrode of the second insulated gate bipolar transistor and the base electrode of the third insulated gate bipolar transistor are used as second input ends of the energy consumption loop of the protection module; the output ends of the current transformer and the voltage transformer are used as the second output end of the energy consumption loop of the protection module.
Bus insulation detection device, two detection resistance and positive negative bus's equivalent resistance to ground form balanced bridge structure, specifically includes: the system comprises a first balance bridge resistor, a second balance Heng Qiao resistor and a galvanometer, wherein the output end of the galvanometer is connected with the second input end of a controller of an attempted recovery module and is used for judging the fault type of a bus;
and the control chip is connected with the energy consumption loop and the bus insulation detection device and used for controlling the energy consumption loop and the bus insulation detection device.
And the attempt recovery module 12 is connected with the protection module 10 by backing the direct current power supply energy storage system and is used for attempting to quickly recover power supply to the direct current power supply energy storage system aiming at the bus fault type after energy consumption is completed. The attempt recovery module 12 specifically includes:
the first output end of the controller is connected to the direct current power supply energy storage system, the third output end of the controller is connected with the input end of the alarm device, the fourth output end of the controller is connected to the direct current breaker, and the third input end of the controller is connected with the output end of the voltage transformer and is used for controlling the direct current power supply energy storage system to try to quickly recover power supply according to the type of bus faults;
the alarm device is used for alarming when the bus fault is not recovered;
and the voltage transformer is used for attempting to quickly restore power supply to the direct-current power supply energy storage system under the control of the controller.
The above technical solutions of the embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The embodiment of the invention provides an automatic switching energy storage system, a protection module of a converter of the automatic switching energy storage system and an attempt recovery module of a direct current power supply system. The protection module consists of an energy consumption loop, a bus insulation detection device and a control chip. The back energy storage system of the trial recovery module comprises a control chip, an alarm device and a voltage transformer. Wherein,
the energy consumption loop first input end of the protection module is connected to the output anode of the energy storage system grid-connected converter, and the energy consumption loop first output end of the protection module is connected to the output cathode of the energy storage system grid-connected converter; the second input end of the energy consumption loop of the protection module is connected with the second output end of the controller; the second output end of the energy consumption loop of the protection module is connected with the first input end of the controller; the energy consumption loop of the protection module comprises a current transformer, an inductor, an energy consumption resistor, a voltage transformer, a first insulated gate bipolar transistor, a second insulated gate bipolar transistor and a third insulated gate bipolar transistor, wherein the collector of the first insulated gate bipolar transistor is used as a first input end of the energy consumption loop of the protection module, the emitter of the first insulated gate bipolar transistor is simultaneously connected with one end of the inductor, the voltage transformer and one end of the energy consumption resistor, the other end of the inductor is simultaneously connected with the other end of the voltage transformer and one end of the current transformer, the other end of the current transformer is connected with the collector of the second insulated gate bipolar transistor, the other end of the energy consumption resistor is connected with the collector of the third insulated gate bipolar transistor, and the emitters of the second insulated gate bipolar transistor and the third insulated gate bipolar transistor are connected to serve as a first output end of the energy consumption loop of the protection module. The base electrode of the first insulated gate bipolar transistor, the base electrode of the second insulated gate bipolar transistor and the base electrode of the third insulated gate bipolar transistor are used as second input ends of the energy consumption loop of the protection module. The output ends of the current transformer and the voltage transformer are used as the second output end of the energy consumption loop of the protection module. The bus insulation detection device of the protection module is a balance bridge structure and comprises a first balance bridge resistor, a second balance Heng Qiao resistor and a galvanometer. Wherein the galvo output is coupled to the second input of the controller.
The attempt recovery module includes a controller, an alarm, a communication line, and a voltage transformer. The first output end of the controller is connected to the energy storage device, the third output end of the controller is connected with the input end of the alarm, the fourth output end of the controller is connected to the direct current breaker, and the third input end of the controller is connected with the output end of the voltage transformer.
As shown in fig. 2 and fig. 3, in the embodiment of the invention, the system is a low-voltage direct current power supply system with +/-375V, the power supply of the system comprises an alternating current power grid, an energy storage system, photovoltaic power generation and the like, and the controller unit adopts the model TMS320F 28335.
The energy consumption loop first input end of the protection module is connected to the output anode of the energy storage system grid-connected converter, and the energy consumption loop first output end of the protection module is connected to the output cathode of the energy storage system grid-connected converter; the second input end of the energy consumption loop of the protection module is connected with the second output end of the controller; the second output end of the energy consumption loop of the protection module is connected with the first input end of the controller;
in the embodiment of the invention, an energy consumption loop of a protection module is taken as an example, as shown in fig. 4, and comprises a current transformer CT 1 An inductance L 1 An energy consumption resistor R 1 A potential transformer PT 1 First insulated gate bipolar transistor T 1 Second insulated gate bipolar transistor T 2 Third insulated gate bipolar transistor T 3 The voltage transformer adopts JDZ1-1 model; the current transformer adopts KHCT911L-600A/5A model.
As shown in fig. 4, in the embodiment of the present invention, the first insulated gate bipolar transistor T 1 The collector of the first IGBT T is used as the first input end of the energy consumption loop of the protection module 1 Is connected with the inductor L at the same time with the emitter of (C) 1 Potential transformer PT 1 Energy dissipation resistor R 1 Is one end of the inductance L 1 The other end of the transformer is connected with a voltage transformer PT 1 And the other end of the current transformer CT 1 Is a current transformer CT 1 The other end of (a) is connected with a second insulated gate bipolar transistor T 2 Collector of said dissipation resistor R 1 The other end of (a) is connected with a third insulated gate bipolar transistor T 3 Collector of (a), second and third insulated gate bipolar transistors T 2 、T 3 The emitter of which is connected to a first output terminal of the energy dissipation circuit of the protection module.
As shown in FIG. 5, the bus insulation detection device in the embodiment of the invention comprises a balance bridge formed by two detection resistors and the equivalent resistance to the ground of the positive bus and the negative bus, and the output end of a galvanometer is connected with the second input end of the controller.
As shown in fig. 6, in the embodiment of the present invention, the circuit includes 3 signal conditioning circuits with the same structure, wherein the 2 signal conditioning circuits are used for energy dissipation loops, and the input ends U/I of the 2 signal conditioning circuits are respectively connected with a voltage transformer PT 1 And 1 current transformer CT 1 An output terminal of (a); the 1 signal conditioning circuit is used for attempting to recover the module, and the input end U/I of the 1 signal conditioning circuit is connected with the voltage transformer PT 2 The output ends of the signal conditioning circuits shown IN figure 7 are connected with a TMS320F28335 type DSP chip through an ADS8364 type data acquisition chip, wherein the output ends +OUT, -OUT and IN of the signal conditioning circuits are sequentially connected with +IN, -IN and REF ends of the data acquisition chip; of data acquisition chipsCLK, D0-D15 are respectively connected with the +.A. of TMS320F28335 model DSP chip> MCLKX, D0 to D15; the 3 ports of GPIO 1-3 of DSP chip are respectively connected with 13 pins of 3M 57962L chips, as shown in figure 8, every 3M 57962L chips are correspondingly connected with a protection module energy consumption loop, wherein, the 5 pins of the 3M 57962L chips are respectively connected with a first insulated gate bipolar transistor T 1 Base of (a) second insulated gate bipolar transistor T 2 Base of (d) and third insulated gate bipolar transistor T 3 Is formed on the base of the substrate. The GPIO4, 5 and 6 ports are respectively connected to the communication lines of the energy storage system, the alarm and the direct current breaker.
In the embodiment of the invention, the inductance releases energy to form a circuit structure shown in fig. 9, the inductance, the second insulated gate bipolar transistor and the third insulated gate bipolar transistor form a loop, and the energy is released through the energy consumption resistor, so that the purpose of releasing the energy in the energy consumption loop of the protection device is realized.
In summary, the embodiment of the invention provides a short-circuit fault quick recovery device applied to a direct-current power supply energy storage system, and the existing direct-current protection method is not directed to the energy storage system and a converter thereof, in view of the influence or damage to the power consumption and the energy storage system caused by the possible short-circuit fault in the direct-current power supply system. The invention provides a short-circuit fault quick recovery device applied to an energy storage system, which comprises an energy consumption loop module for protecting the energy storage system and an attempt recovery module for the whole system. The power supply system comprises a power supply system, an energy storage grid-connected port, a power supply system and a power supply system.
Method embodiment
According to an embodiment of the present invention, there is provided a short-circuit fault recovery method for the foregoing short-circuit fault recovery device, and fig. 10 is a flowchart of the short-circuit fault recovery method according to the embodiment of the present invention, as shown in fig. 10, where the short-circuit fault recovery method according to the embodiment of the present invention specifically includes:
step 101, when a short circuit fault occurs in a bus of a direct current power supply energy storage system, a protection module inhibits the current of a grid-connected port of the direct current power supply energy storage system from rising, prevents insulation and power electronic devices from being damaged, and judges the fault type of the bus;
and 102, after the energy consumption is completed through an attempt recovery module, aiming at the bus fault type, attempting to quickly recover power supply to the direct current power supply energy storage system.
As shown in fig. 11, the above-described processing specifically includes:
step 1, after receiving a bus short-circuit fault signal sent by a bus insulation detection device, a controller sends a control signal to an energy consumption loop of a protection module to enable the first insulated gate bipolar transistor and the second insulated gate bipolar transistor to be on, and sends a control signal to a third insulated gate bipolar transistor to enable the third insulated gate bipolar transistor to be off; that is, when the controller receives the bus short-circuit fault signal sent by the bus insulation detection device, the controller sends a control signal to the first insulated gate bipolar transistor T for protecting the module energy consumption loop 1 Second insulated gateBipolar transistor T 2 Make it conductive and send control signal to the third insulated gate bipolar transistor T 3 Turning it off.
Step 2, the energy consumption loop is formally put into operation at the moment, and meanwhile, a voltage transformer PT in the energy consumption loop is collected 1 And current transformer CT 1 The acquired voltage and current values are sent to a controller;
step 3, the controller judges whether the voltage at two sides of the inductor is stable, whether the current flowing through the inductor is zero, and when the voltage at two sides of the inductor and the current flowing through the inductor are both zero, the operation step 4 is executed, otherwise, the step 2 is executed in a returning mode;
step 4, the controller sends a signal to the first IGBT T 1 Turning it off. Simultaneously transmitting signals to the second insulated gate bipolar transistor T 2 And a third insulated gate bipolar transistor T 3 Make it conduct by voltage transformer PT 1 To inductance L 1 And acquiring voltage values at two sides in real time.
Step 5, the controller judges whether the voltage value is equal to zero, and when the voltage value is zero, the controller finishes the release of the inductance energy to the second insulated gate bipolar transistor T 2 And a third insulated gate bipolar transistor T 3 A signal is sent to turn it off. Then the energy storage system is locked, and the energy consumption loop of the protection module is withdrawn from operation; otherwise, returning to the step 4.
Step 6: after a certain time delay, the controller sends a control signal to the energy storage system, starts the attempt recovery module and starts to enter the attempt recovery stage. The energy storage system is unlocked under the command of the controller, bus voltage is built, after the voltage is built, an energy storage system grid-connected port is tried to be opened to inject current into the public bus, the public bus voltage is detected through a bus voltage transformer, and a signal is sent to the controller through the transformer;
step 7, the controller judges whether the bus voltage is recovered, if so, the fault point is considered to be recovered, and the operation step 8 is executed; if the voltage is not recovered, the secondary fault is considered to be a non-self-recovery fault, and the operation step 9 is executed;
step 8: the controller communicates with the direct current breaker to finish the subsequent closing operation;
step 9: the controller controls the alarm to give an alarm. Waiting for the staff to process.
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 (3)
1. A short circuit fault recovery device for a dc powered energy storage system, the device comprising:
the protection module is used for inhibiting the current of the grid-connected port of the direct current power supply energy storage system from rising when a short circuit fault occurs in a bus of the direct current power supply energy storage system, preventing insulation and power electronic devices from being damaged, and judging the fault type of the bus;
the protection module specifically comprises:
the energy consumption loop, its first input end is connected to the grid-connected converter output positive pole of the direct current power supply energy storage system, its first output end is connected to the grid-connected converter output negative pole of the direct current power supply energy storage system, its second input end is connected to the second output end of the controller of the attempt recovery module, its second output end is connected to the first input end of the controller of the attempt recovery module, is used for restraining the rising of the grid-connected port current of the direct current power supply energy storage system when the bus of the direct current power supply energy storage system has a short circuit fault, prevents insulation and power electronic device damage, specifically includes:
the energy-saving circuit comprises a current transformer, an inductor, an energy consumption resistor, a voltage transformer, a first insulated gate bipolar transistor, a second insulated gate bipolar transistor and a third insulated gate bipolar transistor, wherein a collector of the first insulated gate bipolar transistor is used as a first input end of an energy consumption loop, an emitter of the first insulated gate bipolar transistor is simultaneously connected with one end of the inductor, the voltage transformer and one end of the energy consumption resistor, the other end of the inductor is simultaneously connected with the other end of the voltage transformer and one end of the current transformer, the other end of the current transformer is connected with the collector of the second insulated gate bipolar transistor, the other end of the energy consumption resistor is connected with the collector of the third insulated gate bipolar transistor, and an emitter of the second insulated gate bipolar transistor and the emitter of the third insulated gate bipolar transistor are connected to be used as a first output end of the energy consumption loop; the base electrode of the first insulated gate bipolar transistor, the base electrode of the second insulated gate bipolar transistor and the base electrode of the third insulated gate bipolar transistor are used as second input ends of the energy consumption loop of the protection module; the output ends of the current transformer and the voltage transformer are used as the second output end of the energy consumption loop of the protection module;
and the attempt recovery module is connected with the protection module by leaning against the direct current power supply energy storage system and is used for attempting to quickly recover power supply to the direct current power supply energy storage system according to the bus fault type after energy consumption is completed, and specifically comprises the following steps:
the first output end of the controller is connected to the direct current power supply energy storage system, the third output end of the controller is connected with the input end of the alarm device, the fourth output end of the controller is connected to the direct current breaker, and the third input end of the controller is connected with the output end of the voltage transformer and is used for controlling the direct current power supply energy storage system to try to quickly recover power supply according to the type of bus faults;
the alarm device is used for alarming when the bus fault is not recovered;
and the voltage transformer is used for attempting to quickly restore power supply to the direct-current power supply energy storage system under the control of the controller.
2. The device according to claim 1, wherein the protection module comprises:
bus insulation detection device, two detection resistance and positive negative bus's equivalent resistance to ground form balanced bridge structure, specifically includes: the system comprises a first balance bridge resistor, a second balance Heng Qiao resistor and a galvanometer, wherein the output end of the galvanometer is connected with the second input end of a controller of an attempted recovery module and is used for judging the fault type of a bus;
and the control chip is connected with the energy consumption loop and the bus insulation detection device and used for controlling the energy consumption loop and the bus insulation detection device.
3. A short circuit fault recovery method for a short circuit fault recovery device according to any of the preceding claims 1 to 2, the method comprising in particular:
when a short circuit fault occurs in a bus of the direct current power supply energy storage system, the protection module is used for inhibiting the current of a grid-connected port of the direct current power supply energy storage system from rising, preventing insulation and power electronic devices from being damaged, judging the type of the bus fault, and specifically comprising the following steps:
step 1, after receiving a bus short-circuit fault signal sent by a bus insulation detection device, a controller sends a control signal to an energy consumption loop of a protection module to enable the first insulated gate bipolar transistor and the second insulated gate bipolar transistor to be on, and sends a control signal to a third insulated gate bipolar transistor to enable the third insulated gate bipolar transistor to be off;
step 2, the energy consumption loop is put into operation, information of a voltage transformer and a current transformer in the energy consumption loop is collected, and the collected voltage and current values are sent to the controller;
step 3, the controller judges whether the voltage at two sides of the inductor is stable, whether the current flowing through the inductor is zero, and when the voltage at two sides of the inductor and the current flowing through the inductor are both zero, the operation step 4 is executed, otherwise, the step 2 is executed in a returning mode;
step 4, the controller sends a signal to the first insulated gate bipolar transistor to turn off the first insulated gate bipolar transistor, and simultaneously sends a signal to the second insulated gate bipolar transistor and the third insulated gate bipolar transistor to turn on the second insulated gate bipolar transistor and the third insulated gate bipolar transistor, and voltage values on two sides of the inductor are collected in real time by adopting a voltage transformer;
step 5, the controller judges whether the voltage value is equal to zero, when the voltage value is zero, the inductor energy is released completely, the controller sends signals to the second insulated gate bipolar transistor and the third insulated gate bipolar transistor to turn off the second insulated gate bipolar transistor and the third insulated gate bipolar transistor, then the energy storage system is locked, and the energy consumption loop of the protection module is stopped; otherwise, returning to the execution step 4;
after the energy consumption is completed, aiming at the bus fault type, the power supply is quickly recovered to the direct current power supply energy storage system through an attempt recovery module, and the method specifically comprises the following steps:
step 6: after a preset time delay, the controller sends a control signal to the direct-current power supply energy storage system, starts an attempt recovery module and enters an attempt recovery stage; unlocking the direct current power supply energy storage system under the command of the controller, establishing bus voltage, attempting to open a grid-connected port of the direct current power supply energy storage system to inject current into a public bus after the voltage is established, detecting the public bus voltage through a bus voltage transformer, and sending a signal to the controller by the transformer;
step 7, the controller judges whether the bus voltage is recovered, if so, the fault point is considered to be recovered, and the operation step 8 is executed; if the voltage is not recovered, the secondary fault is considered to be a non-self-recovery fault, and the operation step 9 is executed;
step 8: the controller communicates with the direct current breaker to finish the subsequent closing operation;
step 9: the controller controls the alarm to give an alarm.
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