CN107515329A - A kind of IGBT synthesis overcurrent protection methods and system based on digital filtering - Google Patents

A kind of IGBT synthesis overcurrent protection methods and system based on digital filtering Download PDF

Info

Publication number
CN107515329A
CN107515329A CN201710760206.8A CN201710760206A CN107515329A CN 107515329 A CN107515329 A CN 107515329A CN 201710760206 A CN201710760206 A CN 201710760206A CN 107515329 A CN107515329 A CN 107515329A
Authority
CN
China
Prior art keywords
igbt
current
overcurrent protection
driver element
main control
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201710760206.8A
Other languages
Chinese (zh)
Other versions
CN107515329B (en
Inventor
方存洋
施胜丹
邹宁
刘育鑫
牟晓春
梁帅奇
杨合民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
Original Assignee
Nari Technology Co Ltd
NARI Nanjing Control System Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nari Technology Co Ltd, NARI Nanjing Control System Co Ltd filed Critical Nari Technology Co Ltd
Priority to CN201710760206.8A priority Critical patent/CN107515329B/en
Publication of CN107515329A publication Critical patent/CN107515329A/en
Application granted granted Critical
Publication of CN107515329B publication Critical patent/CN107515329B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H17/00—Networks using digital techniques
    • H03H17/08—Networks for phase shifting

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Emergency Protection Circuit Devices (AREA)
  • Protection Of Static Devices (AREA)

Abstract

The invention discloses a kind of IGBT based on digital filtering to integrate overcurrent protection method.According to over-current level; overcurrent is divided into short-circuit overcurrent protection and system overcurrent protection two-stage; main control unit is completed system overcurrent protection and differentiated; driver element realizes that short-circuit overcurrent protection differentiates and IGBT turns off logic; the two joint completes IGBT quick excess current protective function; compared to the sampled value instant over current protection method generally used at present; this implementation method quick action; the discreteness that is delayed is small; current acquisition circuit need not be set in driver element; and over-current judging device, both reduce driver element volume, and save cost again.

Description

A kind of IGBT synthesis overcurrent protection methods and system based on digital filtering
Technical field
This patent is related to electric and electronic technical field, especially a kind of overcurrent protection technology.
Background technology
Current large power power electronic appliance is using more and more, such as current transformer, static reacance generator (SVG), active Wave filter (APF) etc., in these equipment, the core power electronic device of main circuit is all fully closed disconnected device IGBT.
To ensure the safety of IGBT device in power electronic equipment running, it is necessary to configure IGBT overcurrent protections.Pin The characteristics of to IGBT device, its overcurrent protection include short-circuit overcurrent protection and system overcurrent protection, and system overcurrent is Refer to electric current and be more than IGBT peak inrush currents, but be less than short valve value electric current, and short-circuit overcurrent refers to electric current and is more than IGBT Short-circuit threshold current.Generally IGBT peak inrush currents are 1.2~2 times of normal operating current, and short-circuit threshold values Electric current is then 4~5 times of normal operating current.Electric current is bigger, is endangered to caused by IGBT bigger, and IGBT operating currents are in maximum During peak point current can safe operation 2ms, and during IGBT short circuits, then must be turned off within 10 μ s or so the time.
Traditional instantaneous sampling value overcurrent protection, the maximum that directly can bear sampling gained current instantaneous value with IGBT Peak point current is compared, and is used as the criterion of protection act with this, and although the method is easily achieved, but protection act The discreteness that is delayed is big, it is difficult to meets the needs of IGBT quick overcurrent protections.
The content of the invention
Goal of the invention：A kind of IGBT synthesis overcurrent protection methods based on digital filtering are provided, solve existing overcurrent The problem of protection act delay discreteness is big in protection.
Invention also provides a kind of IGBT based on digital filtering for solving above-mentioned technical problem to integrate over current protection Protecting system.
Technical scheme：In order to achieve the above object, IGBT synthesis overcurrent protection method of the present invention based on digital filtering Following technical scheme can be used
A kind of IGBT synthesis overcurrent protection methods based on digital filtering, alternating current is gathered by main control unit in real time Signal, and current effective value is calculated, by current effective value and default IGBT current limits ratio in each calculating cycle Compared with when current effective value is more than IGBT current limits and is less than short-circuit threshold current, by the system overcurrent protection of main control unit Driver element is issued instructions to turn off IGBT；It is straight by IGBT driver elements when IGBT electric currents are more than short-circuit threshold current Judgement is connect, and turns off IGBT；Judgment principle is that IGBT driver elements gather driving voltage in real time, when driving voltage is more than voltage During limit value, then IGBT is turned off.
And the technical scheme of corresponding above-mentioned overcurrent protection method, present invention simultaneously provides a kind of based on digital filtering IGBT integrates the technical scheme of over-current protection system：
Including：
Main control unit, to collection ac current signal, and current effective value is calculated in real time, in each calculating cycle It is interior by current effective value compared with default IGBT current limits, when current effective value be more than IGBT current limits and less than short During the threshold current of road, driver element is issued instructions to turn off IGBT by the system overcurrent protection of main control unit；
Driver element, to collection driving voltage in real time, when driving voltage is more than voltage limits, then turn off IGBT.
Using above-mentioned technological means, it is an advantage of the invention that：
(1) main control unit gathers AC signal in real time, calculates virtual value in real time, and protection act is quick, and action delay is discrete Property is small, and the computational methods are easily achieved.
(2) IGBT driver elements realize that short-circuit overcurrent protection differentiates, main control unit realizes that system overcurrent protection differentiates, The two overcurrent protection current ration is configured using height step, is combined and is realized quick overcurrent protection.
(3) the system overcurrent protection based on digital filtering realized in main control unit, occupancy main control unit resource is few, But IGBT driver elements have saved the hardware devices such as current acquisition circuit, over-current judging, driver element hardware cost is reduced.
Brief description of the drawings
Fig. 1 is the quick overcurrent integrated protection configuration diagrams of IGBT of the present invention；
Fig. 2 is the polar plot of electric current phase shift.
Fig. 3 is fast current protection discrimination principles figure.
Fig. 4 is driving voltage limit value Vmax value logic chart.
Fig. 5 is the action recording figure of quick overcurrent protection.
Embodiment
Overcurrent protection side is integrated to IGBT of the present invention based on digital filtering with reference to the accompanying drawings and detailed description The embodiment of method elaborates.
1) the IGBT synthesis overcurrent protection policing feature configurations based on digital filtering are as shown in Figure 1：
Main control unit gathers ac current signal i in real time, the α β value of all-pass filter SPF output currents, electricity is calculated Flow virtual value ilp, each calculating cycle compares ilpWith IGBT current limit Imax size, continuous 3 calculating cycles, ilp More than Imax, set IGBT locking mark Blk, otherwise reset lockout mark Blk, while master control set passes Blk by optical fiber Give IGBT driver elements.
Driver element gathers driving voltage Vce in real time with the shorter sampling period, when Vce is more than voltage limits, then defeated Go out locking mark Blk_s.
Driver element detects Blk or Blk_s signals by 0 transition to 1, starts IGBT overcurrent protection flows immediately, by setting Fixed strategy shut-off IGBT, realizes IGBT overcurrent protections.
2) calculating logic after main control unit collection ac current signal i is as shown in Figure 2,3：
I passes through SPF all-pass filters, output of ac i β.All-pass filter SPF effect is input signal x's (k) Amplitude attenuation is to originalTimes, phase to the time reduce the signal period of direction phase shift 1/8th, SPF calculating process such as formula (1), x (k) and y (k), x (k-1) and y (k-1) refer to input and output, the previous meter of wave filter current calculation cycle respectively in formula Calculate the input and output in cycle.
Y (k)=x (k-1) * kb1+y(k-1)*ka1+x(k)*kb0 (1)
Acquired original signal i obtains i β after SPF is filtered, and i subtracts i β and obtains i α, sees formula (2) and polar plot in detail (2)。
I α and i β are α axles and β axial coordinate of the i in α β rectangular coordinate systems.I virtual value
According to the requirement of protection act precision, behind irms calculating, low pass filter LPF is configured, is filtered out in irms High fdrequency component, obtain ilp.
3) driver element differentiate IGBT short circuit overcurrent when driving voltage Vce when, voltage limits Vmax non-constant values, Its logic is as shown in Figure 4：
When IGBT has trigger signal, in the presence of driving voltage Vce monitors enabled logic, voltage limits Vmax is perseverance Fixed value；When Triggerless, the enabled logic of Vce monitoring enabled Vmax after about 1 μ s postpones, now driving voltage Vmax by Outside RC loops determine.
By the driving voltage Vce collected compared with voltage limits Vmax, driving voltage Vce is more than driver element Voltage limits Vmax, then export locking mark Blk_s.
Driver element receives the block signal Blk positive transitions of main control unit transmission by optical fiber, or driver element is certainly Oneself judges locking mark Blk_s positive transitions, starts latching logic immediately, according to predetermined shut-off strategy, locking IGBT, realizes IGBT overcurrent protections.
In the present embodiment, having been used in actual SVG control systems, Fig. 5 is electric current from less than IGBT current limit Imax, Transition is to Imax, the action recording figure of quick overcurrent protection is more than, it is evident that overcurrent protection action is prolonged under this implementation method When it is small.
And include with reference to accompanying drawing and foregoing description, the IGBT synthesis over-current protection systems of the invention based on digital filtering Main control unit and driver element.Main control unit is to collection ac current signal, and current effective value is calculated in real time, every In individual calculating cycle by current effective value compared with default IGBT current limits, when current effective value is more than IGBT current limits And when being less than short-circuit threshold current, driver element is issued instructions to turn off IGBT by the system overcurrent protection of main control unit；Drive Moving cell, to collection driving voltage in real time, when driving voltage is more than voltage limits, then turn off IGBT
Main control unit realizes the system overcurrent protection based on digital filtering, and driver element completes short-circuit overcurrent protection, The current ration of the two overcurrent protection is configured using height, and joint completes the quick excess current protective function of IGBT gamuts.
7th, over-current protection system as claimed in claim 6, it is characterised in that system overcurrent protection in main control unit Implementation method, accurate phase shift and amplitude attenuation are carried out to electric current instantaneous sampling value using all-pass digital filter, realized single-phase Of ac CLARK is converted, and obtains the vector value of current signal, current effective value and phase are calculated according to vector value, is realized The quick overcurrent logics of IGBT
The present invention is disclosed with preferred embodiment above, so it is not intended to limiting the invention, it is all using equivalent substitution or The technical scheme that person's equivalent transformation mode is obtained, is within the scope of the present invention.

Claims (7)

  1. A kind of 1. IGBT synthesis overcurrent protection methods based on digital filtering, it is characterised in that：
    Ac current signal is gathered by main control unit in real time, and current effective value is calculated, will in each calculating cycle Current effective value is less than short-circuit threshold values compared with default IGBT current limits, when current effective value is more than IGBT current limits During electric current, driver element is issued instructions to turn off IGBT by the system overcurrent protection of main control unit；
    When IGBT electric currents are more than short-circuit threshold current, directly judged by IGBT driver elements, and turn off IGBT；Judgment principle For IGBT driver elements gather driving voltage in real time, when driving voltage is more than voltage limits, then turn off IGBT.
  2. 2. overcurrent protection method as claimed in claim 1, it is characterised in that
    The judgement of the overcurrent protection of main control unit control comprises the following steps：
    1-1), main control unit will gather ac current signal i, pass through digital filter so that current sampling data phase is pressed Time change reduces direction, the signal period of phase shift 1/8th, while current signal size is decayed toTimes, obtain i β；
    1-2), primary current signal i, i β are subtracted, obtains i α；
    1-3), the virtual value for calculating ac current signal i is
    1-4), IGBT current limit Imax and virtual valueCompare, continuous 3 points of Imax is less thanIt is defeated Go out locking mark Blk, while IGBT driver elements are passed to by optical fiber.
  3. 3. overcurrent protection method as claimed in claim 2, it is characterised in that.
    The judgement for the IGBT short circuit overcurrent protections realized by driver element comprises the following steps：
    2-1) voltage limits Vmax determination：When there is trigger signal, in the presence of driving voltage Vce monitors enabled logic, Voltage limits Vmax is constant value；When Triggerless, the enabled logic of driving voltage Vce monitoring makes after about 1 μ s are postponed Can voltage limits Vmax, now voltage limits Vmax determined by outside RC loops；
    2-2) for driver element by the driving voltage Vce collected compared with voltage limits Vmax, driving voltage Vce is more than electricity Limit value Vmax is pressed, then exports locking mark Blk_s.
  4. 4. overcurrent protection method as claimed in claim 3, it is characterised in that driver element receives master control list by optical fiber The block signal Blk positive transitions that member is sent, or driver element oneself judge locking mark Blk_s positive transitions, start immediately Latching logic, according to predetermined shut-off strategy, locking IGBT, realize IGBT overcurrent protections.
  5. A kind of 5. IGBT synthesis over-current protection systems based on digital filtering, it is characterised in that including：
    Main control unit, will in each calculating cycle to collection ac current signal, and current effective value is calculated in real time Current effective value is less than short-circuit threshold values compared with default IGBT current limits, when current effective value is more than IGBT current limits During electric current, driver element is issued instructions to turn off IGBT by the system overcurrent protection of main control unit；
    Driver element, to collection driving voltage in real time, when driving voltage is more than voltage limits, then turn off IGBT.
  6. 6. over-current protection system as claimed in claim 5, it is characterised in that main control unit, which is realized based on digital filtering, is System overcurrent protection, driver element complete short-circuit overcurrent protection, and the current ration of the two overcurrent protection is configured using height, joined Close the quick excess current protective function for completing IGBT gamuts.
  7. 7. over-current protection system as claimed in claim 6, it is characterised in that the reality of system overcurrent protection in main control unit Existing method, accurate phase shift and amplitude attenuation are carried out to electric current instantaneous sampling value using all-pass digital filter, realize single phase ac CLARK conversion is measured, the vector value of current signal is obtained, current effective value and phase is calculated according to vector value, realize that IGBT is fast Fast overcurrent logic.
CN201710760206.8A 2017-08-30 2017-08-30 IGBT comprehensive over-current protection method and system based on digital filtering Active CN107515329B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710760206.8A CN107515329B (en) 2017-08-30 2017-08-30 IGBT comprehensive over-current protection method and system based on digital filtering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201710760206.8A CN107515329B (en) 2017-08-30 2017-08-30 IGBT comprehensive over-current protection method and system based on digital filtering

Publications (2)

Publication Number Publication Date
CN107515329A true CN107515329A (en) 2017-12-26
CN107515329B CN107515329B (en) 2020-08-04

Family

ID=60724597

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710760206.8A Active CN107515329B (en) 2017-08-30 2017-08-30 IGBT comprehensive over-current protection method and system based on digital filtering

Country Status (1)

Country Link
CN (1) CN107515329B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114123145A (en) * 2021-12-28 2022-03-01 常熟开关制造有限公司(原常熟开关厂） Instantaneous short-circuit current protection method and device
CN114498665A (en) * 2022-01-20 2022-05-13 昆山帝森华途工业物联网科技有限公司 APF system voltage effective value protection module and method based on FPGA

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103248013A (en) * 2013-05-10 2013-08-14 温州大学 Current transformer current-limiting protection system control device and current-limiting control method thereof
CN103296874A (en) * 2013-05-20 2013-09-11 温州大学 Current transformer parallel operation switching control device and switching control method
CN203398767U (en) * 2013-08-22 2014-01-15 深圳市伟创电气有限公司 Frequency converter over-current protection system based on ACS 710
CN105244849A (en) * 2015-11-25 2016-01-13 中国西电电气股份有限公司 Overcurrent protection method and device for IGCT rectifier
JP2016123205A (en) * 2014-12-25 2016-07-07 東芝三菱電機産業システム株式会社 Step-down chopper
CN106992500A (en) * 2017-05-02 2017-07-28 许继集团有限公司 The bridge arm current over-current protection method and control system of flexible direct current power transmission system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103248013A (en) * 2013-05-10 2013-08-14 温州大学 Current transformer current-limiting protection system control device and current-limiting control method thereof
CN103296874A (en) * 2013-05-20 2013-09-11 温州大学 Current transformer parallel operation switching control device and switching control method
CN203398767U (en) * 2013-08-22 2014-01-15 深圳市伟创电气有限公司 Frequency converter over-current protection system based on ACS 710
JP2016123205A (en) * 2014-12-25 2016-07-07 東芝三菱電機産業システム株式会社 Step-down chopper
CN105244849A (en) * 2015-11-25 2016-01-13 中国西电电气股份有限公司 Overcurrent protection method and device for IGCT rectifier
CN106992500A (en) * 2017-05-02 2017-07-28 许继集团有限公司 The bridge arm current over-current protection method and control system of flexible direct current power transmission system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114123145A (en) * 2021-12-28 2022-03-01 常熟开关制造有限公司(原常熟开关厂） Instantaneous short-circuit current protection method and device
CN114498665A (en) * 2022-01-20 2022-05-13 昆山帝森华途工业物联网科技有限公司 APF system voltage effective value protection module and method based on FPGA
CN114498665B (en) * 2022-01-20 2023-10-13 昆山帝森华途工业物联网科技有限公司 APF system voltage effective value protection module and method based on FPGA

Also Published As

Publication number Publication date
CN107515329B (en) 2020-08-04

Similar Documents

Publication Publication Date Title
Zhang et al. Fault analysis and traveling-wave protection scheme for bipolar HVDC lines
CA2702210C (en) Transformer through-fault current monitor
CA2488045C (en) Instantaneous overcurrent element for heavily saturated current in a power system
CN108183463B (en) Method for preventing misoperation in ratio differential protection of transformer of intelligent substation
CN108548986B (en) High-resistance grounding detection system, device and method of low-current grounding system
CN104638664B (en) Wind park sub-synchronous oscillation guard method and protection device
US20030137309A1 (en) Method for discriminating abnormal current including arc current in AC load circuit and apparatus for executing the same
TWI402518B (en) Wiring device with leakage detection function
WO2011035215A1 (en) Electrical power system phase and ground protection using an adaptive quadrilateral characteristic
EP0881732B1 (en) Apparatus for RMS current approximation
KR102069615B1 (en) Switchboard with built-in zero sequence harmonic filter
CA2759432A1 (en) Systems, methods, and apparatus for leakage current masking and ground fault detection
CN102798770A (en) Method for detecting default phase of frequency converter
CN107515329A (en) A kind of IGBT synthesis overcurrent protection methods and system based on digital filtering
CN109188174B (en) Method for judging AC line outlet fault
CN201266832Y (en) Protection observe and control device for high-voltage motor
CN103487707B (en) Vehicle-mounted three-phase alternating-current powered intelligent monitoring unit
CN102160250B (en) Reclosing method for electrical power transmission line
CN102082420B (en) Longitudinal differential protection method of power transmission line
CN102590591A (en) Detection circuit for monitoring state of current transformer
CA3014132A1 (en) Apparatus for determination of a ground fault and associated method
CN109387700A (en) Method and apparatus for the ground resistance identification in charging cable
CN110018384B (en) Method for detecting a ground fault condition in a power conversion device
CN208046249U (en) Three-phase unbalanced phase-changing device
CN116298496A (en) Power detection system and method for multifunctional isolating switch driving motor

Legal Events

Date Code Title Description
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant