CN106353573A - Overcurrent fault monitoring protection device and method for flexible direct-current transmission inverter station - Google Patents

Overcurrent fault monitoring protection device and method for flexible direct-current transmission inverter station Download PDF

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Publication number
CN106353573A
CN106353573A CN201610989729.5A CN201610989729A CN106353573A CN 106353573 A CN106353573 A CN 106353573A CN 201610989729 A CN201610989729 A CN 201610989729A CN 106353573 A CN106353573 A CN 106353573A
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China
Prior art keywords
unit
current
resistance
fault
igbt
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CN201610989729.5A
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Chinese (zh)
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CN106353573B (en
Inventor
徐建源
刘大鹏
吴冠男
张明理
史喆
张晓天
王优胤
梁毅
宋卓然
杨继业
商文颖
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State Grid Corp of China SGCC
Shenyang University of Technology
Economic and Technological Research Institute of State Grid Liaoning Electric Power Co Ltd
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State Grid Corp of China SGCC
Shenyang University of Technology
Economic and Technological Research Institute of State Grid Liaoning Electric Power Co Ltd
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Priority to CN201610989729.5A priority Critical patent/CN106353573B/en
Publication of CN106353573A publication Critical patent/CN106353573A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • 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
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Nonlinear Science (AREA)
  • Inverter Devices (AREA)

Abstract

The invention provides an overcurrent fault monitoring protection device and method for a flexible direct-current transmission inverter station and relates to the technical field of power system control. The device comprises a microprocessor unit, a composite buffer protection unit, a power frequency conversion unit, an IGBT drive unit, an overheating detection unit, a fault current detection unit, a wireless communication unit, an LC filter and an upper computer, wherein a microprocessor processes the current and temperature information acquired by the overheating detection unit and the fault current detection unit, drives the IGBT drive unit to control the on/off of the IGBT device and transmits the fault information to the upper computer. In the invention, the type of the fault current and the overheating fault of the power frequency conversion unit can be detected and positioned, the detected fault current is positioned, classified and processed so as to quickly and accurately inhibit the short-circuit current and overcurrent in the fault period, the damage of the power frequency conversion unit is avoided, and the monitoring position and protection of overcurrent fault of the flexible direct-current transmission inverter station are realized.

Description

Over current fault monitoring and protecting device and method for flexible DC power transmission Inverter Station
Technical field
The present invention relates to technical field of electric power system control, more particularly, to a kind of mistake for flexible DC power transmission Inverter Station Stream malfunction monitoring protection device and method.
Background technology
With the prominent of environmental problem and energy crisis aggravation, the renewable energy power generation such as wind energy, solar energy is dashed forward Fly the development pushed ahead vigorously.Technology of HVDC based Voltage Source Converter, as the grid-connected effective means of clean energy resource, is paid attention to by more and more people. Due to flexible direct current power transmission system regulative mode and self structure inherent character, the fault current of DC power transmission line has rising , over current fault frequently, when an error occurs, fault current easily damages changing of Inverter Station in the feature that speed is fast, peak value is big Flow device and apparatus insulated, and flexible DC power transmission cannot be monitored to fault current positioning by related measure and classify, The self-cleaning of fault cannot be realized by adjusting Trigger Angle, therefore, the overcurrent fault for flexible DC power transmission is monitored and protected Shield is put forward higher requirement.In flexible DC power transmission engineering, conventional high-tension direct current is only used for reference to the protection of DC line at present The Preservation tactics of transmission of electricity, are not suitable with the QA requirement of flexible direct current route protection.For flexible DC power transmission Inverter Station Over current fault, over current fault is identified the route protection not only needing rapidly and reliably it is also desirable to corresponding treatment measures With means, the overcurrent after fault is effectively limited, to reduce fault dash current to Inverter Station change of current device, direct current Circuit and the infringement of system.
Content of the invention
For the defect of prior art, the present invention provides a kind of monitoring of the over current fault for flexible DC power transmission Inverter Station Protection device and method, are directed to the monitoring positioning of over current fault and the suppression protection of circuit over current fault, combine hardware Auxiliary circuit, control method and control system hardware configuration, can detect type and the power converter unit mistake of positioning failure electric current Hot stall, to detecting that fault current is positioned, classified and processed, and then quick and precisely during suppression fault short circuit current and Overcurrent, it is to avoid the damage of power converter unit, realizes flexible DC power transmission Inverter Station over current fault monitoring positioning and protects, keep away Exempt from the secondary damage that Inverter Station change of current device, DC line and system are caused, and there is the interactive function of enhancing.
On the one hand, the present invention provides a kind of over current fault monitoring and protecting device for flexible DC power transmission Inverter Station, bag Include microprocessor unit, composite buffering protection location, power converter unit, igbt (igbt) driver element, Overheating detection unit, fault current detection unit, radio communication unit, lc wave filter and host computer；
Described microprocessor unit includes main control chip, the first buffer chip and the second buffer chip, overheated for processing Electric current and temperature information that detector unit and fault current detection unit collect, and then drive igbt driver element to control igbt The break-make of device, simultaneously by transmitting fault information to host computer, protects related device from secondary damage；Described igbt drives single Unit is connected with main control chip by the first buffer chip, and described overheating detection unit and fault current detection unit are all by second Buffer chip is connected with main control chip, and described radio communication unit is directly connected with described main control chip；
Described composite buffering protection location includes two structure identical the first composite buffering circuit and the second composite buffering Circuit, is respectively arranged on two buses, for suppressing peak voltage on bus during igbt device break-make；Described composite buffering protection Unit includes two inputs and three outfans, and the first input end of described composite buffering protection location connects as unidirectional current The flexible DC power transmission sending end station in source, the second input described igbt driver element of connection of described composite buffering protection location is defeated Go out end, the input of the first outfan connecting fault current detecting unit of described composite buffering protection location, described being combined is delayed The second outfan rushing protection location connects overheating detection unit first input end, and the 3rd of described composite buffering protection location is defeated Go out the first input end that end connects power converter unit；
Described power converter unit is used for bus bar side DC voltage being changed into grid side alternating voltage, including 6 structures Identical subelement, the circuit structure of each subelement is all identical with the circuit structure of the described first or second composite buffering circuit；
Described igbt driver element is used for for microprocessor unit output signal carrying out boosting process, and then reaches control Igbt device grids required voltage；
Described overheating detection unit is used for detecting each igbt device in composite buffering protection location and power converter unit Temperature, including 8 groups of circuit structure identical overheating detection circuits；
Whether described fault current detection unit is used for detecting the electric current of measuring point to be checked in monitoring and protecting device beyond default Current value, detects single including bridge arm direct pass fault current detection unit, bus-bar fault current detecting unit and load fault current Unit, the testing circuit of described bridge arm direct pass fault current detection unit is dispersion current foldback circuit, for detecting composite buffering In unit and power converter unit, whether the bridge arm direct pass electric current of measuring point to be checked exceedes pre-set current value, described bus-bar fault electric current The detection protection circuit of detector unit and load fault current detector unit is concentration current foldback circuit, described bus-bar fault Current detecting unit is used for detecting whether the electric current of dc bus measuring point to be checked exceedes pre-set current value, and divides on two buses It is not provided with a bus-bar fault current detecting unit, described load fault current detector unit is used for treating on detection load connecting line Whether the electric current of test point exceedes pre-set current value；
Described radio communication unit is used for for the signal of microprocessing unit radioing to host computer；
Described lc wave filter is used for filtering the harmonic wave of power converter unit generation, including three groups of lc filter circuits, described three The input of group lc filter circuit connects No. three outfans of described power converter unit respectively, described three groups of lc filter circuits Outfan connects the triple line of electrical network respectively；
Described host computer is mobile phone and computer pc, for the excessively stream of real-time monitoring device, overheating fault information, simultaneously permissible Control the break-make of igbt device by sending instruction.
Further, described first composite buffering circuit include an igbt device, first resistor, the first electric capacity, first Inductance, the first backward diode, the second backward diode；One end of described first inductance is as described composite buffering protection location First input end, connect as DC source flexible DC power transmission sending end station, be simultaneously connected with the moon of the first backward diode Pole, the other end of described first inductance connects the colelctor electrode of an igbt device, one end of first resistor, the first backward diode Anode and the second backward diode anode, the emitter stage of a described igbt device connects the moon of the second backward diode Pole, the other end of first resistor, the positive pole of the first electric capacity, the first input end of power converter unit, described first electric capacity negative Pole as the 3rd outfan of composite buffering protection location, connects the of the emitter stage of an igbt device and power converter unit One input, the gate pole of an igbt device, as the second input of composite buffering protection location, connects igbt driver element Outfan；The colelctor electrode of a described igbt device is as the first outfan of composite buffering unit, connecting fault electric current The input of detector unit；6. locate to place ptc critesistor in the position of an igbt device, as composite buffering protection location The second outfan, connect overheating detection unit first input end.
Further, described power converter unit also includes the 3rd electric capacity；The gate pole of the igbt device of each subelement is all made For the second input of power converter unit, connect the outfan of igbt driver element；One end of inductance in each subelement is divided Not as the input of corresponding subelement；The emitter stage of the igbt device in each subelement is respectively as the output of corresponding subelement End；The first subelement in described 6 structure identical subelements, the 3rd subelement, the input of the 5th subelement are connected to A bit, as the first input end of power converter unit, connect the 3rd output of the first composite buffering circuit being connected with bus i End, the second subelement in described 6 structure identical subelements, the 4th subelement, the outfan of the 6th subelement are connected to A bit, as the first input end of power converter unit, connect the second composite buffering circuit being connected with bus ii the 3rd is defeated Go out end；Described 3rd capacitance connection is between the input and the outfan of the second subelement of the first subelement；Described 6 structures It is single that the first subelement in identical subelement, the 3rd subelement, the outfan of the 5th subelement are connected respectively the second son Unit, the 4th subelement, the input of the 6th subelement, and No. three outfans respectively as power converter unit.
Further, described igbt driver element includes driving chip and peripheral protection circuit, and wherein peripheral circuit includes 9th diode, the tenth electric capacity, the 11st electric capacity, current-limiting resistance, buffer resistance, feedback resistance, transistor and optocoupler；Drive core 6 feet of piece connect the anode of the 9th diode, and the negative electrode of the 9th diode connects the colelctor electrode being driven igbt device, drives core 2 feet of piece are simultaneously connected with one end of 15v power supply, the tenth capacitance cathode and feedback resistance, and 3 feet of driving chip are simultaneously connected with the tenth The positive pole of one electric capacity and one end of buffer resistance, the other end of buffer resistance, as the outfan of igbt driver element, connects quilt Drive the gate pole of igbt device；The negative pole of the tenth electric capacity and the 11st electric capacity be simultaneously connected with by drive igbt device emitter stage and 1 foot of driving chip, 15 feet of driving chip connect one end of current-limiting resistance, and the other end of current-limiting resistance connects 15v power supply, drives 14 feet of dynamic chip connect the colelctor electrode of transistor, and the emitter stage of transistor is connected with 1 foot of optocoupler, and the grid of transistor connects First buffer chip of microprocessor unit, 6 feet of driving chip are connected with the second outfan of overheating detection unit, drive core 5 feet of piece are connected with 4 feet of optocoupler, and 3 feet of optocoupler connect the other end of feedback resistance, and 2 pins of optocoupler connect microprocessor Unit.
Further, described overheating detection circuit include the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, First critesistor, the second critesistor, first voltage comparator and second voltage comparator；Described first voltage comparator In-phase input end is as the first input end of overheating detection unit, one end phase respectively with the first critesistor and the 9th resistance Even, the other end of the 9th resistance connects DC source vcc, the other end ground connection of the first critesistor；Described second voltage compares The in-phase input end of device, as the second input of overheating detection unit, is divided with one end of the second critesistor and the 11st resistance Not connected, the other end of the 11st resistance connects DC source vcc, the other end ground connection of the second critesistor；First voltage ratio All it is connected with one end of the tenth resistance and the 12nd resistance with the reverse input end of second voltage comparator compared with device, the tenth resistance The other end connects DC source vcc, the other end ground connection of the 12nd resistance；The signal output part of first voltage comparator is as mistake First outfan of hot detector unit, is connected with microprocessor unit, output alarm signal, and the signal of second voltage comparator is defeated Go out end as the second outfan of overheating detection unit, the second input phase with microprocessor unit and igbt driver element Even, cut-off signals are exported.
Further, described dispersion current foldback circuit is used for detecting in composite buffering unit and power converter unit The bridge arm direct pass electric current that igbt device is constituted, including tertiary voltage comparator, the 13rd resistance, the 14th resistance, the 15th electricity Resistance and the 16th resistance, the tenth diode and the 11st diode and the first adjustable potentiometer；Described tertiary voltage comparator Input connects one end of the 14th resistance and the anode of the tenth diode in the same direction, and the negative electrode of the tenth diode is as dispersion excessively stream The input of protection circuit, connects the colelctor electrode of each igbt device in power converter unit；One end of 13rd resistance connects 15v DC source, the other end connects the other end of the 14th resistance and a fixing end of the first adjustable potentiometer；First adjustable electric Another fixing end ground connection of position device, the sliding end of the first adjustable potentiometer is connected with one end of the 15th resistance, the 15th electricity The other end of resistance connects the reverse input end of tertiary voltage comparator；The positive source of tertiary voltage comparator connects 15v direct current Power supply, one end of one end of the 16th resistance, the pin 2 of the driving chip of igbt driver element and the tenth electric capacity；Tertiary voltage The power cathode ground connection of comparator, the other end and the 11st of the signal output part of tertiary voltage comparator and the 16th resistance The negative electrode of pole pipe is connected, and the anode of the 11st diode, as the outfan of dispersion current foldback circuit, connects igbt and drives list The pin 6 of the driving chip of unit, the signal output part of tertiary voltage comparator connects the second buffer chip of microprocessor unit.
Further, described concentration current foldback circuit includes Hall current sensor, the 17th resistance, the 18th electricity Resistance, the 19th resistance, the second adjustable potentiometer, the 12nd electric capacity, the 13rd electric capacity and the 4th voltage comparator；Hall current passes Sensor is installed on the connecting line of tested measuring point, and the signal output part of Hall current sensor and the 4th voltage comparator are in the same direction Input is connected；17th resistance is in parallel with the 12nd electric capacity and then one end is grounded, and the other end connects the 4th voltage comparator Input in the same direction, carries out signal filtering；Second adjustable potentiometer one fixing end accesses 15v power supply, and another fixing end is grounded, Sliding end is connected with the reverse input end of the 4th voltage comparator, provides feedback voltage；5v power supply is accessed in 18th resistance one end As pull-up resistor, the other end connects signal output part and the 19th resistance one end of the 4th voltage comparator；19th resistance The other end as concentrate current foldback circuit an output port, be connected with the second buffer chip of microprocessor unit, It is simultaneously connected with one end of the 13rd electric capacity, the other end ground connection of the 13rd electric capacity；19th resistance and the 13rd electric capacity constitute rc Delay circuit.
Further, each unit in the described over current fault monitoring and protecting device for flexible DC power transmission Inverter Station Power pack is provided by the Switching Power Supply with plurality of voltages output (output ± 15v, 5v, 3.3v voltage).
On the other hand, the present invention also provides a kind of monitoring positioning of the over current fault for flexible DC power transmission Inverter Station and protects The method of shield, the method is realized by the over current fault monitoring and protecting device for flexible DC power transmission Inverter Station, including following Step:
Step 1, composite buffering protection location, power converter unit and igbt driver element are controlled using microprocessor unit Inner member, make whole over current fault monitoring and protecting device be in running status, method particularly includes:
Step 1.1, send spwm (sinusoidal pulse width modulation) signal using microprocessor unit；
Step 1.2, boosting process is carried out by igbt driver element, spwm voltage signal magnitude is raised to 15v；
The igbt device of step 1.3, respectively driving igbt composite buffering unit and power converter unit, makes each igbt device Conducting, the over current fault monitoring and protecting device being used in flexible DC power transmission Inverter Station is in normal operating condition；
Step 2, the data acquisition carrying out electric current and heat and record, method particularly includes:
Dispersion in step 2.1, the ptc critesistor simultaneously adopting overheating detection unit, fault current detection unit Stream protection circuit, concentration current foldback circuit carry out reality to the electric current of composite buffering protection location and power converter unit and heat When collection；
Overheating detection unit produces two paths of signals, and a road alarm signal gives microprocessor unit, and road cut-off signals send To the driving chip of igbt driver element, promote igbt to carry out dropping grid voltage soft switching, suppress peak surge electric current, it is to avoid power becomes Frequency unit damages；
Current foldback circuit of concentrating in bus-bar fault current detecting unit and load fault current detector unit produces Level signal gives driving chip and the microprocessor unit of igbt driver element through the delay of rc delay circuit；
The temperature data of step 2.2, microprocessor unit acquisition and recording each road electric current and igbt device, builds igbt in real time The temperature of device and the graph of relation of detection branch；
Whether step 3, the position of microprocessor unit failure judgement electric current, judge current value more than the first predetermined current threshold Value, whether the temperature of igbt device reaches the first default temperature alarm temperature, if the first predetermined current threshold and first was preset In thermal warning temperature, any one is exceeded or both are exceeded simultaneously, then explanation is broken down, and corresponding unit is trouble unit, Execution step 4, otherwise Inverter Station is working properly, returns execution step 2；
Step 4, control signal sending to the corresponding units breaking down is produced using microprocessor unit, to fault The igbt device of unit carries out slow fall grid voltage；Microprocessor unit records the position of fault current simultaneously, produces corresponding volume Number, failure logging is sent note to mobile phone through radio communication unit, reports the fault message that microprocessor unit is judged, Concurrently it is out of order intermediate alarm signal, by failed transmission to computer pc host computer；Computer pc host computer is by existing fault and computer The fault being stored in data base is contrasted, and determines type and the position of fault current；
Step 5, microprocessor differentiate further to fault current overheating detection, judge whether current value is default more than second Current threshold, whether igbt temperature reaches the second default temperature alarm temperature, and it is pre- that the wherein second predetermined current threshold is more than first If current threshold, the second default temperature alarm temperature is more than the first default temperature alarm temperature, if the second predetermined current threshold and In second default temperature alarm temperature, any one is exceeded or both are exceeded simultaneously, then assert that correspondence position occurs seriously short Road or over current fault, execution step 6, otherwise return to step 2；
Step 6, microprocessor unit send control signal, block input signal, turn off and seriously short circuit or excessively stream event occur Igbt device in the unit of barrier, fault message is continuously sent note to user mobile phone by radio communication unit, Microprocessor unit produces fault Critical alerts signal simultaneously, by failed transmission to computer pc host computer.
As shown from the above technical solution, the beneficial effects of the present invention is: the present invention provide one kind be used for flexible direct current The over current fault monitoring and protecting device and method of transmission of electricity Inverter Station, is directed to monitoring positioning and the event of circuit excessively stream of over current fault The suppression protection of barrier.Add composite buffering unit in flexible DC power transmission sending end dc bus first, when being switched on or off bus During igbt device, can preferentially suppress to reduce the surge voltage amplitude on bus；Secondly add overheating detection unit, to igbt device The operating temperature of part is checked, records correlated temperature data, by computer pc host computer, data is analyzed, sets up igbt Relation curve between temperature and electric current, the classification for fault current provides foundation；Finally by fault current detection unit pair The over current fault position of power converter unit is monitored positioning, and delays fall grid by hardware-assist circuit and microprocessor unit Pressure, the over reach circuit failure protection time, is communicated with mobile phone and computer using radio communication unit, realizes mobile phone and electricity Data sharing between brain, strengthens human computer conversation, it is to avoid it causes secondary damage to Inverter Station change of current device, DC line and system Bad.Present invention incorporates hardware-assist circuit, control method and control system hardware configuration, the class of positioning failure electric current can be detected Type and power converter unit overheating fault, to detecting that fault current is positioned, classified and processed, and then quick and precisely suppress Short circuit current and overcurrent during fault, it is to avoid the damage of power converter unit, realize the event of flexible DC power transmission Inverter Station excessively stream Barrier monitoring positioning and protection.
Brief description
Fig. 1 is a kind of over current fault monitoring and protecting dress for flexible DC power transmission Inverter Station provided in an embodiment of the present invention Put structural representation；
Fig. 2 is the circuit theory diagrams of microprocessor unit provided in an embodiment of the present invention；
Fig. 3 is the circuit theory diagrams of composite buffering circuit provided in an embodiment of the present invention；
Fig. 4 is the circuit theory diagrams of power converter unit provided in an embodiment of the present invention；
Fig. 5 be flexible DC power transmission sending end station provided in an embodiment of the present invention, composite buffering unit, power converter unit with The connection circuit theory diagrams of lc wave filter；
Fig. 6 is the circuit theory diagrams of igbt driver element provided in an embodiment of the present invention；
Fig. 7 is the circuit theory diagrams of overheating detection unit provided in an embodiment of the present invention；
Fig. 8 is the operation principle schematic diagram of dispersion current foldback circuit provided in an embodiment of the present invention；
Fig. 9 is the schematic diagram of the dispersion current foldback circuit of access igbt driver element provided in an embodiment of the present invention；
Figure 10 is the concentration current foldback circuit on flexible DC power transmission sending end dc bus provided in an embodiment of the present invention Circuit theory diagrams；
Figure 11 is that the flexible DC power transmission Inverter Station over current fault that is applied to provided in an embodiment of the present invention is monitored positioning and protected The method flow diagram of shield；
Figure 12 is that composite buffering unit igbt provided in an embodiment of the present invention turns off moment circuit theory diagrams；
Figure 13 opens moment circuit theory diagrams for composite buffering unit igbt provided in an embodiment of the present invention；
Figure 14 is installation over current fault monitoring and protecting device three-phase current effective value curve provided in an embodiment of the present invention Figure；
Figure 15 is three-phase current virtual value curve after installation over current fault monitoring and protecting device provided in an embodiment of the present invention Figure；
Figure 16 is igbt temperature and current relationship after installation over current fault monitoring and protecting device provided in an embodiment of the present invention Curve chart.
Specific embodiment
With reference to the accompanying drawings and examples, the specific embodiment of the present invention is described in further detail.Hereinafter implement Example is used for the present invention is described, but is not limited to the scope of the present invention.
As shown in figure 1, a kind of over current fault monitoring and protecting device for flexible DC power transmission Inverter Station, this device includes Microprocessor unit, composite buffering protection location, power converter unit (flexible DC power transmission be subject to end station), igbt driver element, Overheating detection unit, fault current detection unit, radio communication unit, lc wave filter and host computer.In the present embodiment, channel radio News unit adopts sim808 wireless module, and for the signal of microprocessing unit is radioed to host computer, igbt device adopts The igbt module of model fz1000r20ks4, igbt driver element adopts exb841igbt integrated drive, and host computer is handss Machine and computer pc, for the excessively stream of real-time monitoring device, overheating fault information, can control igbt to lead to by sending instruction simultaneously Disconnected.In device, the power pack of each unit is by the switch electricity with plurality of voltages output (output ± 15v, 5v, 3.3v voltage) Source provides.
Microprocessor unit is used for processing overheating detection unit and fault current detection unit collects electric current and temperature Information, and then drive igbt driver element to control the break-make of igbt device, simultaneously by transmitting fault information to host computer, protect phase Close device from secondary damage.In the present embodiment, microprocessor unit include a tms320f28335 main control chip, first delay Rush chip 74hc245 and the second buffer chip 743384, igbt driver element, overheating detection unit and fault current detection unit All it is connected with main control chip by buffer chip, radio communication unit is directly connected with main control chip.Tms320f28335 master control Chip is the processor that a dominant frequency is up to 150mhz, has the pulsewidth modulation port pwm1-8, built-in 2*8 of 8 road mutual symmetries 12 adc transducers of passage, have the sci communication interface of 3 passages.
Taking one group of detector unit as a example, as shown in Fig. 2 microprocessor unit and the concrete attachment structure of other peripheral cells For: pulsewidth modulation port pwm1, pwm2, pwm3, pwm4, pwm5, pwm6, pwm7, pwm8 of main control chip is slow with first respectively A0, a1, a2, a3, a4, a5, a6, a7 mouth rushing chip 74hc245 connects one to one, the b0 of the first buffer chip 74hc245 Connect s3 the and s4 mouth of igbt driver element with b1, b6 and b1 of 74hc245 buffer chip connect igbt driver element in1 and In2 mouth, adcina0, adcina7 mouth a0 and a1 with the second buffer chip 743384 respectively of tms320f28335 main control chip Port is connected, d0 the and d18 mouth of tms320f28335 main control chip connects a8 the and a15 end of the second buffer chip 743384 respectively Mouthful, b0 with b7 of the second buffer chip 743384 is connected with oc1 the and oc2 port of fault current detection unit respectively, and second delays B8 with b15 rushing chip 743384 is connected with two output port s1 and s2 of overheating detection unit respectively；Radio communication unit The scitxd mouth of sim808 module is connected with the scirxd mouth of tms320f28335 main control chip, radio communication unit sim808 mould The scirxd mouth of block is connected with the scitxd mouth of tms320f28335 main control chip.
Composite buffering protection location includes two structure identical composite buffering circuit, is respectively arranged on two buses, suppression Peak voltage on bus during igbt break-make processed, composite buffering protection location includes two inputs and three outfans, is combined slow Rush the flexible DC power transmission sending end station as DC source for the first input end connection of protection location, composite buffering protection location Second input connects igbt driver element outfan, the first outfan connecting fault current detecting of composite buffering protection location The input of unit, the second outfan of composite buffering protection location connects overheating detection unit first input end, composite buffering 3rd outfan of protection location connects the first input end of power converter unit (flexible DC power transmission is subject to end station).
Composite buffering circuit structure on two buses is identical, as shown in figure 3, all including a high frequency to cut-off function Igbt device vt1, resistance r1, electric capacity c1, inductance l1, the first backward diode vd1 and the second backward diode vd2.With one As a example bus, the first composite buffering circuit includes igbt device vt1, resistance r1, electric capacity c1, inductance l1, the first backward diode Vd1 and the second backward diode vd2, concrete attachment structure is: one end of inductance l1 as the input of this composite buffering circuit, The i.e. first input end of composite buffering protection location, connects the flexible DC power transmission sending end station as DC source, is simultaneously connected with The negative electrode of the first backward diode vd1, the other end of inductance l1 connect the colelctor electrode of igbt device vt1, one end of resistance r1, the The anode of one backward diode vd1 and the anode of the second backward diode vd2, the emitter stage connection second of igbt device vt1 is anti- To the first input end of the negative electrode of diode vd2, the other end of resistance r1, the positive pole of electric capacity c1 and power converter unit, electric capacity The negative pole of c1, as the 3rd outfan of composite buffering protection location, connects emitter stage and the power frequency conversion list of igbt device vt1 The first input end of unit；The gate pole of igbt device vt1, as the second input of composite buffering protection location, connects igbt and drives Unit outfan.The colelctor electrode of igbt device vt1 is as the first outfan of composite buffering unit, connecting fault current detecting list The input of unit；6. locate to place ptc critesistor in the position of igbt device vt1, as the second output of composite buffering unit End, connects the first input end of overheating detection unit.
Power converter unit is used for for bus bar side DC voltage being changed into grid side alternating voltage, as shown in figure 4, including filter Ripple Support Capacitor c3 and 6 structure identical subelements, the circuit structure of each subelement is all electric with the first or second composite buffering The circuit structure on road is identical.Igbt device vt3 and its peripheral circuit are as the first subelement of power converter unit, igbt device , as the second subelement of power converter unit, igbt device vt5 and its peripheral circuit become as power for vt4 and its peripheral circuit 3rd subelement of frequency unit, igbt device vt6 and its peripheral circuit are as the 4th subelement of power converter unit, igbt device , as the 5th subelement of power converter unit, igbt device vt8 and its peripheral circuit are as power for part vt7 and its peripheral circuit 6th subelement of converter unit., cut-off igbt device vt3, the resistance of function including a high frequency taking the first subelement as a example R3, electric capacity c4, inductance l3, the first backward diode vd3, the second backward diode vd4；It is reverse that one end of inductance l3 connects first The negative electrode of diode vd3, the other end of inductance l3 connect the colelctor electrode of igbt device vt3, one end of resistance r3, first reverse two The anode of pole pipe vd3 and the anode of the second backward diode vd4, the emitter stage of igbt device vt3 connects the second backward diode The negative electrode of vd4, the other end of resistance r3, the positive pole of electric capacity c4, the negative pole of electric capacity c4 connects the emitter stage of igbt device vt3, The gate pole of igbt device vt3, as the second input of power converter unit, connects igbt driver element first outfan.Each son One end of inductance l3, l4, l5, l6, l7, l8 in unit respectively as the input of corresponding subelement, in each subelement The emitter stage of igbt device vt3, vt4, vt5, vt6, vt7, vt8 is respectively as the outfan of corresponding subelement.Power frequency conversion list First subelement of unit, the 3rd subelement, the input of the 5th subelement are simultaneously connected with the first composite buffering being connected with bus i 3rd outfan of circuit, the second subelement, the 4th subelement, the outfan of the 6th subelement are simultaneously connected with and are connected with bus ii The second composite buffering circuit the 3rd outfan.Electric capacity c3 is connected to the input of the first subelement and the output of the second subelement Between end.First subelement of power converter unit, the 3rd subelement, the outfan of the 5th subelement are connected respectively power Converter unit second subelement, the 4th subelement, the input of the 6th subelement, and three tunnels respectively as power converter unit Outfan.
Flexible DC power transmission sending end station, connection circuit such as Fig. 5 of composite buffering unit, power converter unit and lc wave filter Shown.
Igbt driver element includes exb841 driving chip and peripheral protection circuit, as shown in fig. 6, wherein peripheral circuit bag Include era34-10 diode d9, electric capacity c10, c11, current-limiting resistance re, buffer resistance rg, feedback resistance rf, transistor tcr and Tlp251 optocoupler.Each igbt driver element drives one group of half-bridge being made up of two igbt.6 feet of driving chip exb841 are even Connect the anode of era34-10 diode d9, the negative electrode of era34-10 diode d9 connects the colelctor electrode being driven igbt device, drives 2 feet of dynamic chip exb841 are simultaneously connected with 15v power supply, electric capacity c10 positive pole, the positive pole of electric capacity c11 simultaneously with driving chip 3 feet of exb841, one end of buffer resistance rg are connected, the other end of buffer resistance rg as the outfan of igbt driver element, Connect the gate pole being driven igbt device, the negative pole of electric capacity c10 and electric capacity c11 is simultaneously connected with the emitter stage being driven igbt, drives 15 feet of dynamic chip exb841 connect one end of current-limiting resistance re, and the other end of current-limiting resistance re connects 15v power supply, driving chip 14 feet of exb841 connect the colelctor electrode of transistor tcr, and the emitter stage of transistor tcr is connected with 1 foot of tlp251 optocoupler, crystal The grid of pipe tcr as igbt driver element connect microprocessor control signals input in1, the 6 of driving chip exb841 Foot is connected with the second outfan s2 of overheating detection unit, and 5 feet of driving chip exb841 are connected with 4 feet of tlp251 optocoupler, 3 feet of tlp251 optocoupler connect one end of feedback resistance rf, and the other end of feedback resistance rf is simultaneously connected with 15v unit and drives core 2 feet of piece exb841,2 pins of tlp251 optocoupler connect microprocessor unit.In composite buffering unit and power converter unit The gate pole of all igbt devices be all connected with the outfan of igbt driver element.
Overheating detection unit is used for detecting the temperature of each igbt device in composite buffering protection location and power converter unit, Including 8 groups of circuit structure identical overheating detection circuits, corresponding detection composite buffering protection location and power converter unit respectively In 8 igbt devices temperature.
Taking one group of overheating detection circuit as a example, as shown in fig. 7, comprises three 2k resistance r9, r10, r11,470 Europe electricity Resistance r12, two ptc critesistor rtc1, rtc2 and two voltage comparators u1, u2, voltage comparator therein is lm339 type Number, its concrete attachment structure is: the in-phase input end (pin 3) of voltage comparator u1 is as the first input of overheating detection unit End, is respectively connected with one end of critesistor rtc1 and resistance r9, and the other end of resistance r9 connects DC source vcc, temperature-sensitive electricity The other end ground connection of resistance rtc1；The in-phase input end (pin 3) of voltage comparator u2 is as the second input of overheating detection unit End, is respectively connected with one end of critesistor rtc2 and resistance r11, and the other end of resistance r11 connects DC source vcc, temperature-sensitive The other end ground connection of resistance rtc2；The reverse input end (pin 2) of voltage comparator u1 and u2 all with resistance r10 and r12 one End is connected, and the other end of resistance r10 connects DC source vcc, the other end ground connection of resistance r12；The signal of voltage comparator u1 Outfan (pin 1), as the first outfan s1 of overheating detection unit, is connected with microprocessor unit, output alarm signal, The signal output part (pin 1) of voltage comparator u2 as the second outfan s2 of overheating detection unit, with microprocessor unit It is connected with igbt driver element, export cut-off signals.
In Fig. 7, DC source vcc, resistance r10 and resistance r12 series connection, provide reference voltage vref, as detected igbt When device temperature is less than 100 degree, the resistance value of critesistor rtc1 and rtc2 is both less than 470 Europe, therefore critesistor rtc1 and Pressure drop vtc1 and vtc2 of rtc2 is both less than reference voltage vref, now in-phase input end (pin 3) electricity of voltage comparator u1 Reverse input end (pin 2) voltage less than u1 for the pressure, voltage comparator u1 exports low level, the homophase input of voltage comparator u2 End (pin 3) voltage is less than reverse input end (pin 2) voltage of u2, and voltage comparator u2 exports low level.Therefore, work as warning When signal and cut-off signals are all low level, detected igbt device temperature is normal.Temperature when detected igbt device When being less than 120 degree more than 100 degree, the pressure drop vtc1 of critesistor rtc1 is more than reference voltage vref, and critesistor rtc2 Pressure drop vtc2 be less than reference voltage vref, now voltage comparator u1 output high level, voltage comparator u2 export low level. Therefore, when alarm signal is high level, when cut-off signals are low level, overheating detection circuit sends temperature alarm to control circuit Signal.When the temperature of detected igbt device is more than 120 degree, vtc1 and vtc2 is both greater than vref, and now u1 and u2 is defeated Go out high level.Therefore, when alarm signal and cut-off signals are all high level, control circuit turns off main circuit, protects igbt device Part, prevents from damaging because overheated.
Whether the electric current that fault current detection unit is used for measuring point to be checked in detection means exceeds predetermined current threshold, including Bridge arm direct pass fault current detection unit, bus-bar fault current detecting unit and load fault current detector unit.Bridge arm direct pass The testing circuit of fault current detection unit is dispersion current foldback circuit, for detecting composite buffering unit and power frequency conversion list In unit, whether the bridge arm direct pass electric current of measuring point to be checked exceedes pre-set current value, for detecting composite buffering unit and power frequency conversion list Dispersion current foldback circuit structure in unit is identical, the inspection of bus-bar fault current detecting unit and load fault current detector unit Survey protection circuit and be concentration current foldback circuit, bus-bar fault current detecting unit is used for detecting the electricity of measuring point to be checked on bus Whether stream exceedes pre-set current value, and is respectively equipped with a bus-bar fault current detecting unit, load faulty on two buses Whether the electric current that current detecting unit is used for measuring point to be checked on detection load connecting line exceedes pre-set current value.Bridge arm direct pass fault The test position of current detecting unit as in Fig. 3 and 4 6. and 7., test position such as Fig. 4 of bus-bar fault current detecting unit In 1. and 2., in the test position such as Fig. 4 of load fault current detector unit 3., 4. and 5..
The operation principle of dispersion current foldback circuit is as shown in figure 8, vref is as the setting threshold disperseing current foldback circuit Threshold voltage, when the voltage that comparator detects at 0 point is more than the threshold voltage setting, comparator output high level passes through and door And exports high level signal to microprocessing unit, and then sends pulse control signal, controls igbt break-make, prevents device from suffering from Secondary damage.
, Fig. 9 provides for the present embodiment taking the dispersion current foldback circuit located at the measuring point to be checked of power converter unit as a example Access igbt driver element dispersion current foldback circuit fundamental diagram, dispersion current foldback circuit concrete structure include Voltage comparator u3, resistance r13, r14, r15 and r16, Schottky diode vd10 and vd11, blue white adjustable potentiometer rp1 (use To adjust setting voltage threshold value).The input in the same direction of lm339 voltage comparator u3 connects one end and the Schottky two of resistance r14 The anode of pole pipe vd10, the negative electrode of Schottky diode vd10, as the input ina of dispersion current foldback circuit, connects power The colelctor electrode of converter unit igbt device vt3；The one termination 15v DC source of resistance r13, another terminating resistor of resistance r13 The other end of r14 and a fixing end of adjustable potentiometer rp1；Another fixing end ground connection of adjustable potentiometer rp1, adjustable electric The sliding end of position device rp1 is connected with one end of resistance r15, and the other end of resistance r15 connects the reverse input of voltage comparator u3 End；One end of resistance r16 connects 15v DC source, and is simultaneously connected with the positive source of voltage comparator u3, igbt driver element The pin 2 of driving chip exb841 and igbt driver element electric capacity c10 one end；The power cathode 14 of voltage comparator u3 Foot is grounded, the negative electrode of the signal output part of lm339 voltage comparator u3 and the other end of resistance r16 and Schottky diode vd11 It is connected, the anode of Schottky diode vd11, as the outfan of dispersion current foldback circuit, connects the drive of igbt driver element The pin 6 of dynamic chip, that the signal output part out of voltage comparator u3 is fault current detection unit with microprocessor unit The adoc1 mouth that two buffer chips connect.Resistance r13 is connected with blue white adjustable potentiometer rp1, by adjustable potentiometer rp1, through electricity Resistance r15 provides feedback voltage vref to lm339 voltage comparator u3, and the input in the same direction of lm339 voltage comparator u3 passes through two Pole pipe vd10 is acquired to the collector voltage of igbt device, is compared by the value with default vref, and then differentiates Whether the brachium pontis of igbt device there is over current fault.
, as shown in Figure 10, concentrated taking the concentration current foldback circuit on flexible DC power transmission sending end dc bus as a example , including Hall current sensor h1, resistance r17, r18, r19, indigo plant is adjustable in vain taking bus i as a example for the concrete structure of stream protection circuit Potentiometer rp2, electric capacity c12, c13 and lm339 voltage comparator u4, wherein, Hall current sensor h1 is using Japanese hinode The direct measuring type hall effect current sensor hap8-200/4 of company, this sensor needs positive and negative 15v dual power supply to be powered.Electricity The specific attachment structure in road is: the input in the same direction of the signal output part of Hall current sensor h1 and lm339 voltage comparator u4 End (pin 3) is connected；One end ground connection after resistance r17 is in parallel with electric capacity c12, the other end connects the same of lm339 voltage comparator u4 To input (pin 3), carry out signal filtering；Mono- fixing end of adjustable potentiometer rp2 accesses 15v power supply, another fixing end Ground connection, sliding end is connected with the reverse input end pin 2 of lm339 voltage comparator u4, provides feedback voltage；Resistance r18 one end Access 5v power supply as pull-up resistor, the other end connects signal output part (pin 1) and the resistance of lm339 voltage comparator u4 R19 one end, for improving the current driving ability of lm339 voltage comparator u4 signal output part, the other end conduct of resistance r19 Concentrate an output port oc1 of current foldback circuit, that is, fault current detection unit buffers with the second of microprocessor unit The adoc2 mouth that chip connects, is simultaneously connected with one end of electric capacity c13, the other end ground connection of electric capacity c13, resistance r19 and electric capacity c13 Constitute rc delay circuit.Lm339 voltage comparator u4 outfan (pin 1) signal buffered resistance r19 outputs level signals 0c1 To microprocessor, current data is recorded, when seriously exceeding threshold value, block the drive signal of all igbt, and, resistance The delay circuit of r19 and electric capacity c13 composition is the interference protection measure for preventing lockout circuit misoperation from taking.On another bus It is provided with mutually isostructural concentration current foldback circuit, its output port is oc2.
Lc wave filter is used for filtering the harmonic wave of power converter unit generation, including three groups of lc filter circuits, three groups of lc filtering The input of circuit connects No. three outfans of power converter unit respectively, and the outfan of three groups of lc filter circuits connects electricity respectively The triple line of net.
It is used for by one kind that the above-mentioned over current fault monitoring and protecting device for flexible DC power transmission Inverter Station is realized The over current fault monitoring positioning of flexible DC power transmission Inverter Station and the method for protection, as shown in figure 11, specifically include following steps:
Step 1, composite buffering protection location, power converter unit and igbt driver element are controlled using microprocessor unit Inner member, make whole over current fault monitoring and protecting device be in running status, method particularly includes:
Step 1.1, send spwm (sinusoidal pulse width modulation) signal using microprocessor unit；
Step 1.2, boosting process is carried out by igbt driver element, spwm voltage signal magnitude is raised to 15v；
Step 1.3, two igbt devices driving igbt composite buffering unit respectively and 6 igbt devices of power converter unit Part, makes each igbt break-over of device, and the over current fault monitoring and protecting device being used in flexible DC power transmission Inverter Station is in normal fortune Row state；
Dispersion excessively stream in step 2, the ptc critesistor simultaneously adopting overheating detection unit, fault current detection unit Protection circuit, concentration current foldback circuit are carried out to the electric current of composite buffering protection location and power converter unit and heat in real time Collection, the ptc critesistor of overheating detection unit is to all igbt devices in composite buffering protection location and power converter unit Part enters trip temperature actual monitoring；
Overheating detection unit produces two paths of signals, and a road alarm signal gives microprocessor unit, and road cut-off signals send To the exb841 driving chip of igbt driver element, promote igbt to carry out dropping grid voltage soft switching, suppress peak surge electric current, it is to avoid Power converter unit damages；
The level signal producing in bus-bar fault current detecting unit and load fault current detector unit postpones through rc The exb841 driving chip of igbt driver element and the adcina0-a7 mouth of microprocessor unit are given in the delay of circuit；
Microprocessor unit acquisition and recording each road electric current and the temperature data of igbt device, build the temperature of igbt device in real time Degree and the graph of relation of detection branch；
Whether step 3, the position of microprocessor unit failure judgement electric current, judge current value more than 1.2 times of setting values, Whether the temperature of igbt device reaches 100 DEG C of temperature alarm temperature, if wherein any one exceedes or both exceed simultaneously, says Bright break down, corresponding unit be trouble unit, execution step 4, otherwise explanation direct current transportation Inverter Station working properly, return is held Row step 2, proceeds to detect；
Step 4, control signal sending to the corresponding units breaking down is produced using microprocessor unit, to fault The igbt device of unit carries out slow fall grid voltage；Microprocessor unit records the position of fault current simultaneously, produces corresponding volume Number, numbering 1 is bus current fault, and numbering 2 is bridge arm direct pass fault, and numbering 3 and 5 is load short circuits fault, and fault is remembered Record sends note to mobile phone through sim808 radio communication unit, reports the fault message that microprocessor unit is judged, concurrently It is out of order intermediate alarm signal, by failed transmission to computer pc host computer；Computer pc host computer is by existing fault and computer data The fault being stored in storehouse is contrasted, and determines type and the position of fault current；
Step 5, microprocessor differentiate further to fault current overheating detection, judge whether current value sets more than 1.5 times Definite value, whether igbt temperature reaches 120 DEG C of temperature alarm temperature, if any one exceedes or both exceed simultaneously, it is right to assert Answer position that seriously short circuit or over current fault, execution step 6, otherwise execution step 2 occur；
Step 6, microprocessor unit send control signal, block input signal, turn off and seriously short circuit or excessively stream event occur Igbt device in the unit of barrier, fault message is continuously sent note to user by sim808 radio communication unit Mobile phone, the fault Critical alerts signal of microprocessor unit generation simultaneously, by failed transmission to computer pc host computer, it is to avoid to inversion Device causes secondary damage.
In the present embodiment, when completing monitoring and protecting, turn off igbt device and form composite buffering circuit as shown in figure 12 Structure, the electric current in inductance l1 is discharged through diode vd1, and the energy of the stray inductance storage in vt1 is through electricity simultaneously Hold c1 and resistance r1 to be released, buffered and turned off the excessively stream producing during igbt device, it is to avoid igbt device failure.
In the present embodiment, when monitoring and protecting device brings into operation, open the formation of igbt device and be combined as shown in fig. 13 that Buffer circuit structure, inductance l1 inhibits the current-rising-rate opening igbt moment in colelctor electrode side, reduces colelctor electrode side wave Gush peak voltage, vt1 opens the surge current of moment and is released through vd2 and c1 simultaneously, such as the dotted line road strength of in figure, buffering Open the surge current that igbt moment produces, it is to avoid igbt device failure.
Over current fault monitoring and protecting device three-phase current effective value curve as shown in figure 14 is being installed, excessively stream event is being installed Three-phase current virtual value curve as shown in figure 15 after barrier monitoring and protecting device, can be seen that after opening from the curve of in figure During 40ms to 42ms, after installation, peak current is significantly suppressed, and after 42ms, AC voltage waveform is substantially changed Kind, fault current instantaneous peak value is also significantly suppressed.
The igbt temperature curve as shown in figure 16 with current relationship after over current fault monitoring and protecting device is installed, bent from figure Line can be seen that after opening rear igbt device, and in 0～20 DEG C, electric current slowly rises, and 23 DEG C～38 DEG C periods, electric current is several Not in change, igbt device stable operation, when overheating fault, electric current is rapid with the increase of igbt device temperature Raise, after exceeding heat-resistant limit, igbt device damages, and electric current reduces as far as possible.After over current fault monitoring and protecting device is installed, can With the variation relation of electric current and temperature in real-time monitoring overheating fault, after overheating fault occurs, carry out failture evacuation in c-d point, Device is avoided to suffer from secondary damage it is ensured that system is normally run.
Finally it is noted that above example, only in order to technical scheme to be described, is not intended to limit；Although With reference to the foregoing embodiments the present invention is described in detail, it will be understood by those within the art that: it still may be used To modify to the technical scheme described in previous embodiment, or wherein some or all of technical characteristic is equal to Replace；And these modifications or replacement, do not make the essence of appropriate technical solution depart from the model that the claims in the present invention are limited Enclose.

Claims (9)

1. a kind of over current fault monitoring and protecting device for flexible DC power transmission Inverter Station it is characterised in that: this device includes Microprocessor unit, composite buffering protection location, power converter unit, igbt (igbt) driver element, mistake Hot detector unit, fault current detection unit, radio communication unit, lc wave filter and host computer；
Described microprocessor unit includes main control chip, the first buffer chip and the second buffer chip；Described igbt driver element It is connected with main control chip by the first buffer chip, described overheating detection unit and fault current detection unit are all slow by second Rush chip to be connected with main control chip, described radio communication unit is directly connected with described main control chip, for processing overheating detection Electric current and temperature information that unit and fault current detection unit collect, and then drive igbt driver element to control igbt device Break-make, simultaneously by transmitting fault information to host computer, protect related device from secondary damage；
Described composite buffering protection location includes two structure identical the first composite buffering circuit and the second composite buffering circuit, It is respectively arranged on two buses, for suppressing peak voltage on bus during igbt device break-make；Described composite buffering protection location Including two inputs and three outfans, the first input end of described composite buffering protection location connects as DC source Flexible DC power transmission sending end station, the second input of described composite buffering protection location connects described igbt driver element output End, the input of the first outfan connecting fault current detecting unit of described composite buffering protection location, described composite buffering Second outfan of protection location connects overheating detection unit first input end, the 3rd output of described composite buffering protection location End connects the first input end of power converter unit；
Described power converter unit is used for for bus bar side DC voltage being changed into grid side alternating voltage, identical including 6 structures Subelement, the circuit structure of each subelement is all identical with the circuit structure of the described first or second composite buffering circuit；
Described igbt driver element is used for for microprocessor unit output signal carrying out boosting process, and then reaches control igbt device Part grid required voltage；
Described overheating detection unit is used for detecting the temperature of each igbt device in composite buffering protection location and power converter unit, Including 8 groups of circuit structure identical overheating detection circuits；
Described fault current detection unit is used for detecting whether the electric current of measuring point to be checked in monitoring and protecting device exceeds predetermined current Value, including bridge arm direct pass fault current detection unit, bus-bar fault current detecting unit and load fault current detector unit, institute State bridge arm direct pass fault current detection unit testing circuit be dispersion current foldback circuit, for detect composite buffering unit and In power converter unit, whether the bridge arm direct pass electric current of measuring point to be checked exceedes pre-set current value, described bus-bar fault current detecting list The detection protection circuit of unit and load fault current detector unit is concentration current foldback circuit, described bus-bar fault electric current inspection Survey unit to be used for detecting whether the electric current of dc bus measuring point to be checked exceedes pre-set current value, and be respectively equipped with two buses One bus-bar fault current detecting unit, described load fault current detector unit is used for measuring point to be checked on detection load connecting line Electric current whether exceed pre-set current value；
Described radio communication unit is used for for the signal of microprocessing unit radioing to host computer；
Described lc wave filter is used for filtering the harmonic wave of power converter unit generation, including three groups of lc filter circuits, described three groups of lc The input of filter circuit connects No. three outfans of described power converter unit, the output of described three groups of lc filter circuits respectively End connects the triple line of electrical network respectively；
Described host computer is mobile phone and computer pc, for the excessively stream of real-time monitoring device, overheating fault information, can pass through simultaneously Send the break-make that instruction controls igbt device.
2. the over current fault monitoring and protecting device for flexible DC power transmission Inverter Station according to claim 1, its feature It is: described first composite buffering circuit includes an igbt device, first resistor, the first electric capacity, the first inductance, first reverse Diode, the second backward diode；One end of described first inductance as the first input end of described composite buffering protection location, Connect the flexible DC power transmission sending end station as DC source, be simultaneously connected with the negative electrode of the first backward diode, described first electricity The colelctor electrode of other end connection the first igbt device of sense, one end of first resistor, the anode of the first backward diode and second The anode of backward diode, the emitter stage of a described igbt device connects the negative electrode of the second backward diode, first resistor The other end, the positive pole of the first electric capacity, the first input end of power converter unit, the negative pole of described first electric capacity is as composite buffering 3rd outfan of protection location, the connection emitter stage of the first igbt device and the first input end of power converter unit, first The gate pole of igbt device, as the second input of composite buffering protection location, connects the outfan of igbt driver element；Described An igbt device colelctor electrode as composite buffering unit the first outfan, the input of connecting fault current detecting unit End；6. locate to place ptc critesistor in the position of an igbt device, as the second outfan of composite buffering protection location, Connect the first input end of overheating detection unit.
3. the over current fault monitoring and protecting device for flexible DC power transmission Inverter Station according to claim 2, its feature It is: described power converter unit also includes the 3rd electric capacity；The gate pole of the igbt device of each subelement is all as power frequency conversion list Second input of unit, connects the outfan of igbt driver element；One end of inductance in each subelement is respectively as corresponding son The input of unit；The emitter stage of the igbt device in each subelement is respectively as the outfan of corresponding subelement；Described 6 knots The first subelement in structure identical subelement, the 3rd subelement, the input of the 5th subelement are connected to a bit, as power The first input end of converter unit, connects the 3rd outfan of the first composite buffering circuit being connected with bus i, described 6 knots The second subelement in structure identical subelement, the 4th subelement, the outfan of the 6th subelement are connected to a bit, as power The first input end of converter unit, connects the 3rd outfan of the second composite buffering circuit being connected with bus ii；Described 3rd Capacitance connection is between the input and the outfan of the second subelement of the first subelement；Described 6 structure identical subelements In the first subelement, that the 3rd subelement, the outfan of the 5th subelement are connected respectively the second subelement, the 4th son is single Unit, the input of the 6th subelement, and No. three outfans respectively as power converter unit.
4. the over current fault monitoring and protecting device for flexible DC power transmission Inverter Station according to claim 3, its feature Be: described igbt driver element includes driving chip and peripheral protection circuit, wherein peripheral circuit include the 9th diode, the Ten electric capacity, the 11st electric capacity, current-limiting resistance, buffer resistance, feedback resistance, transistor and optocoupler；6 feet of driving chip connect the The anode of nine diodes, the negative electrode of the 9th diode connects the colelctor electrode being driven igbt device, and 2 feet of driving chip connect simultaneously Connect one end of 15v power supply, the tenth capacitance cathode and feedback resistance, 3 feet of driving chip are simultaneously connected with the positive pole of the 11st electric capacity With one end of buffer resistance, the other end of buffer resistance, as the outfan of igbt driver element, connects and driven igbt device Gate pole；The negative pole of the tenth electric capacity and the 11st electric capacity is simultaneously connected with the 1 of the emitter stage being driven igbt device and driving chip Foot, one end of 15 feet connection current-limiting resistances of driving chip, the other end connection 15v power supply of current-limiting resistance, the 14 of driving chip Foot connects the colelctor electrode of transistor, and the emitter stage of transistor is connected with 1 foot of optocoupler, and the grid of transistor connects microprocessor list First buffer chip of unit, 6 feet of driving chip are connected with the second outfan of overheating detection unit, 5 feet of driving chip and 4 feet of optocoupler are connected, and 3 feet of optocoupler connect the other end of feedback resistance, and 2 pins of optocoupler connect microprocessor unit.
5. the over current fault monitoring and protecting device for flexible DC power transmission Inverter Station according to claim 1, its feature It is: described overheating detection circuit includes the 9th resistance, the tenth resistance, the 11st resistance, the 12nd resistance, the first temperature-sensitive electricity Resistance, the second critesistor, first voltage comparator and second voltage comparator；The in-phase input end of described first voltage comparator As the first input end of overheating detection unit, it is respectively connected with one end of the first critesistor and the 9th resistance, the 9th resistance The other end connect DC source vcc, the first critesistor the other end ground connection；The homophase input of described second voltage comparator End, as the second input of overheating detection unit, is respectively connected with one end of the second critesistor and the 11st resistance, the tenth The other end of one resistance connects DC source vcc, the other end ground connection of the second critesistor；First voltage comparator and the second electricity The reverse input end of pressure comparator is all connected with one end of the tenth resistance and the 12nd resistance, and the other end of the tenth resistance connects directly Stream power supply vcc, the other end ground connection of the 12nd resistance；The signal output part of first voltage comparator is as overheating detection unit First outfan, is connected with microprocessor unit, output alarm signal, and the signal output part of second voltage comparator is as overheated Second outfan of detector unit, is connected with the second input of microprocessor unit and igbt driver element, and output turns off letter Number.
6. the over current fault monitoring and protecting dress for flexible DC power transmission Inverter Station according to claim 4 or 5 any one Put it is characterised in that: described dispersion current foldback circuit be used for detect in composite buffering unit and power converter unit igbt Device constitute bridge arm direct pass electric current, including tertiary voltage comparator, the 13rd resistance, the 14th resistance, the 15th resistance and 16th resistance, the tenth diode and the 11st diode and the first adjustable potentiometer；Described tertiary voltage comparator is in the same direction Input connects one end of the 14th resistance and the anode of the tenth diode, and the negative electrode of the tenth diode is as dispersion overcurrent protection The input of circuit, connects the colelctor electrode of each igbt device in power converter unit；One end of 13rd resistance connects 15v direct current Power supply, the other end connects the other end of the 14th resistance and a fixing end of the first adjustable potentiometer；First adjustable potentiometer Another fixing end ground connection, the sliding end of the first adjustable potentiometer is connected with one end of the 15th resistance, the 15th resistance The other end connects the reverse input end of tertiary voltage comparator；The positive source connection 15v DC source of tertiary voltage comparator, One end of one end of the 16th resistance, the pin 2 of the driving chip of igbt driver element and the tenth electric capacity；Tertiary voltage comparator Power cathode ground connection, the other end of the signal output part of tertiary voltage comparator and the 16th resistance and the 11st diode Negative electrode is connected, and the anode of the 11st diode, as the outfan of dispersion current foldback circuit, connects the drive of igbt driver element The pin 6 of dynamic chip, the signal output part of tertiary voltage comparator connects the second buffer chip of microprocessor unit.
7. the over current fault monitoring and protecting dress for flexible DC power transmission Inverter Station according to claim 4 or 5 any one Put it is characterised in that: described concentration current foldback circuit include Hall current sensor, the 17th resistance, the 18th resistance, the 19 resistance, the second adjustable potentiometer, the 12nd electric capacity, the 13rd electric capacity and the 4th voltage comparator；Hall current sensor It is installed on the connecting line of tested measuring point, the input in the same direction of the signal output part of Hall current sensor and the 4th voltage comparator End is connected；17th resistance is in parallel with the 12nd electric capacity and then one end is grounded, and the other end connects the 4th voltage comparator in the same direction Input, carries out signal filtering；Second adjustable potentiometer one fixing end accesses 15v power supply, and another fixing end is grounded, and slides End is connected with the reverse input end of the 4th voltage comparator, provides feedback voltage；5v power supply conduct is accessed in 18th resistance one end Pull-up resistor, the other end connects signal output part and the 19th resistance one end of the 4th voltage comparator；19th resistance another One end, as an output port concentrating current foldback circuit, is connected with the second buffer chip of microprocessor unit, simultaneously Connect one end of the 13rd electric capacity, the other end ground connection of the 13rd electric capacity；19th resistance and the 13rd electric capacity constitute rc and postpone Circuit.
8. the over current fault monitoring and protecting device for flexible DC power transmission Inverter Station according to claim 1, its feature It is: in this device, the power pack of each unit exports opening of (output ± 15v, 5v, 3.3v voltage) by having plurality of voltages Closing power supply provides.
9. a kind of method of over current fault monitoring positioning for flexible DC power transmission Inverter Station and protection, the method passes through right Require the over current fault monitoring and protecting device for flexible DC power transmission Inverter Station described in 1 to realize, comprise the following steps:
Step 1, controlled using microprocessor unit composite buffering protection location, power converter unit and igbt driver element interior Portion's element, makes whole over current fault monitoring and protecting device be in running status, method particularly includes:
Step 1.1, send spwm (sinusoidal pulse width modulation) signal using microprocessor unit；
Step 1.2, boosting process is carried out by igbt driver element, spwm voltage signal magnitude is raised to 15v；
Step 1.3, drive composite buffering unit and power converter unit respectively so as in each igbt break-over of device, be used in The over current fault monitoring and protecting device of flexible DC power transmission Inverter Station is in normal operating condition；
Step 2, the data acquisition carrying out electric current and heat and record, method particularly includes:
Step 2.1, simultaneously using the dispersion current foldback circuit in overheating detection unit, fault current detection unit, concentrated Stream protection circuit carries out Real-time Collection to the electric current of composite buffering protection location and power converter unit and heat；
Overheating detection unit produces two paths of signals, and a road alarm signal gives microprocessor unit, and road cut-off signals are given The driving chip of igbt driver element, promotes igbt to carry out dropping grid voltage soft switching, suppresses peak surge electric current, it is to avoid power frequency conversion Unit damages；
The level concentrating current foldback circuit generation in bus-bar fault current detecting unit and load fault current detector unit Signal gives driving chip and the microprocessor unit of igbt driver element through the delay of rc circuit；
The temperature data of step 2.2, microprocessor unit acquisition and recording each road electric current and igbt device, builds igbt device in real time Temperature and detection branch graph of relation；
Whether step 3, the position of microprocessor unit failure judgement electric current, judge current value more than the first predetermined current threshold, Whether the temperature of igbt device reaches the first default temperature alarm temperature, if the first predetermined current threshold and first presets overheated report In alert temperature, any one is exceeded or both are exceeded simultaneously, then explanation is broken down, and corresponding unit is trouble unit, execution Step 4, otherwise Inverter Station is working properly, returns execution step 2；
Step 4, control signal sending to the corresponding units breaking down is produced using microprocessor unit, to trouble unit Igbt device carry out slow fall grid voltage；Microprocessor unit records the position of fault current simultaneously, produces corresponding numbering, will Failure logging sends note to mobile phone through radio communication unit, reports the fault message that microprocessor unit is judged, concurrently It is out of order intermediate alarm signal, by failed transmission to computer pc host computer；Computer pc host computer is by existing fault and computer data The fault being stored in storehouse is contrasted, and determines type and the position of fault current；
Whether step 5, microprocessor differentiate further to fault current overheating detection, judge current value more than the second predetermined current Threshold value, whether igbt temperature reaches the second default temperature alarm temperature, and the wherein second predetermined current threshold is more than the first default electricity Stream threshold value, the second default temperature alarm temperature is more than the first default temperature alarm temperature, if the second predetermined current threshold and second In default temperature alarm temperature, any one is exceeded or both are exceeded simultaneously, then assert correspondence position occur seriously short circuit or Over current fault, execution step 6, otherwise return to step 2；
Step 6, microprocessor unit send control signal, block input signal, turn off generation seriously short-circuit or over current fault Igbt device in unit, fault message is continuously sent note to user mobile phone by radio communication unit, simultaneously Microprocessor unit produces fault Critical alerts signal, by failed transmission to computer pc host computer.
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CN112003244A (en) * 2020-07-31 2020-11-27 深圳市禾望电气股份有限公司 Fault pre-judging method and system for power module
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CN115149445A (en) * 2022-09-02 2022-10-04 东营金丰正阳科技发展有限公司 Novel box-type substation

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