CN107515329B - IGBT comprehensive over-current protection method and system based on digital filtering - Google Patents
IGBT comprehensive over-current protection method and system based on digital filtering Download PDFInfo
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- CN107515329B CN107515329B CN201710760206.8A CN201710760206A CN107515329B CN 107515329 B CN107515329 B CN 107515329B CN 201710760206 A CN201710760206 A CN 201710760206A CN 107515329 B CN107515329 B CN 107515329B
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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
- G01R19/16528—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
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- 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
Abstract
The invention discloses an IGBT comprehensive over-current protection method based on digital filtering. According to the overcurrent level, the overcurrent is divided into two stages of short-circuit overcurrent protection and system overcurrent protection, the main control unit finishes system overcurrent protection judgment, the driving unit realizes short-circuit overcurrent protection judgment and IGBT turn-off logic, and the short-circuit overcurrent protection judgment and the IGBT turn-off logic are combined to finish the rapid overcurrent protection function of the IGBT.
Description
Technical Field
The patent relates to the technical field of power electronics, in particular to an overcurrent protection technology.
Background
At present, high-power electronic equipment is applied more and more, such as a current transformer, a Static Var Generator (SVG), an Active Power Filter (APF) and the like, and in the equipment, core power electronic devices of a main circuit are all full-turn-off devices, namely IGBTs.
In order to ensure the safety of the IGBT device in the operation process of the power electronic equipment, the IGBT overcurrent protection must be configured. Aiming at the characteristics of the IGBT device, the overcurrent protection comprises short-circuit overcurrent protection and system overcurrent protection, wherein the system overcurrent means that the current is larger than the maximum peak current of the IGBT but smaller than the short-circuit threshold current, and the short-circuit overcurrent means that the current is larger than the short-circuit threshold current of the IGBT. Under general conditions, the maximum peak current of the IGBT is 1.2-2 times of the normal operation current, and the short-circuit threshold current is 4-5 times of the normal operation current. The larger the current is, the greater the damage to the IGBT is, the IGBT can safely operate for 2ms when the working current is the maximum peak current, and the IGBT must be turned off within about 10 mus when short-circuited.
In the traditional instantaneous sampling value overcurrent protection, the instantaneous value of the current obtained by sampling is directly compared with the maximum peak current which can be borne by the IGBT to serve as a judgment condition of protection action.
Disclosure of Invention
The purpose of the invention is as follows: the IGBT comprehensive overcurrent protection method based on digital filtering is provided, and the problem that the discreteness of protection action delay in the existing overcurrent protection is large is solved.
The invention also provides an IGBT comprehensive overcurrent protection system based on digital filtering, which solves the technical problems.
The technical scheme is as follows: in order to achieve the above purpose, the IGBT integrated overcurrent protection method based on digital filtering of the present invention may adopt the following technical solutions
A digital filtering-based IGBT comprehensive overcurrent protection method comprises the steps that an alternating current signal is collected in real time through a main control unit, a current effective value is obtained through calculation, the current effective value is compared with a preset IGBT current limit value in each calculation period, and when the current effective value is larger than the IGBT current limit value and smaller than a short-circuit threshold value current, a system overcurrent protection of the main control unit sends an instruction to a driving unit to turn off an IGBT; when the current of the IGBT is larger than the short-circuit threshold current, the IGBT is directly judged by the IGBT driving unit and is turned off; the judgment principle is that the IGBT driving unit collects driving voltage in real time, and when the driving voltage is larger than a voltage limit value, the IGBT is turned off.
Corresponding to the technical scheme of the overcurrent protection method, the invention also provides a technical scheme of the IGBT comprehensive overcurrent protection system based on digital filtering, which comprises the following steps:
the method comprises the following steps:
the main control unit is used for acquiring alternating current signals in real time, calculating to obtain a current effective value, comparing the current effective value with a preset IGBT current limit value in each calculation period, and when the current effective value is larger than the IGBT current limit value and smaller than a short-circuit threshold value current, sending an instruction to the driving unit by system overcurrent protection of the main control unit to turn off the IGBT;
and the driving unit is used for acquiring the driving voltage in real time, and when the driving voltage is greater than the voltage limit value, the IGBT is turned off.
By adopting the technical means, the invention has the advantages that:
(1) the main control unit collects the alternating current signals in real time, the effective value is calculated in real time, the protection action is rapid, the action delay discreteness is small, and the calculation method is easy to realize.
(2) The IGBT driving unit realizes the judgment of short-circuit overcurrent protection, the main control unit realizes the judgment of system overcurrent protection, and the fixed values of the overcurrent protection currents of the IGBT driving unit and the main control unit adopt high-low step configuration to jointly realize rapid overcurrent protection.
(3) The system overcurrent protection based on digital filtering realized in the main control unit occupies few resources of the main control unit, but the IGBT drive unit saves hardware devices such as a current acquisition loop and overcurrent judgment, and reduces the hardware cost of the drive unit.
Drawings
Fig. 1 is a diagram of an IGBT rapid overcurrent comprehensive protection arrangement of the present invention;
fig. 2 is a vector diagram of current phase shifting.
Fig. 3 is a fast current protection decision diagram.
Fig. 4 is a logic diagram of values of the driving voltage limit Vmax.
Fig. 5 is a diagram of the action waveform of the fast overcurrent protection.
Detailed Description
The following describes an embodiment of the IGBT integrated overcurrent protection method based on digital filtering according to the present invention in detail with reference to the accompanying drawings and the detailed description.
1) The digital filtering-based IGBT integrated overcurrent protection strategy functional configuration is shown in fig. 1:
the main control unit collects an alternating current signal i in real time, αβ values of SPF output current of the phase-shift filter are calculated to obtain a current effective value ilpComparing i every calculation cyclelpAnd the magnitude of the IGBT current limit value Imax, continuously for 3 calculation periods ilpAnd if the current value is larger than Imax, setting the IGBT blocking mark Blk, otherwise resetting the blocking mark Blk, and simultaneously transmitting the Blk to the IGBT driving unit by the main control device through the optical fiber.
The driving unit collects the driving voltage Vce in real time in a shorter sampling period, and when the Vce is larger than a voltage limit value, a locking mark Blk _ s is output.
And when the driving unit detects that the signal of Blk or Blk _ s jumps from 0 to 1, the IGBT overcurrent protection process is immediately started, and the IGBT is turned off according to a set strategy, so that the IGBT overcurrent protection is realized.
2) The calculation logic after the main control unit collects the alternating current signal i is shown in fig. 2 and 3:
i passes through an SPF phase shift filter to output an AC output i β, the SPF phase shift filter is used to attenuate the amplitude of the input signal x (k) to the original amplitude
The phase is shifted by one eighth of the signal period in the direction of time reduction, the SPF calculation process is as formula (1), wherein x (k) and y (k), x (k-1) and y (k-1) respectively refer to the input and output of the current calculation period of the filter and the input and output of the previous calculation period.
y(k)＝x(k-1)*kb1+y(k-1)*ka1+x(k)*kb0(1)
The original acquisition signal i is subjected to SPF filtering to obtain i β, i β is subtracted from i to obtain i α, and the detailed formula (2) and the vector diagram (2) are shown.
i α and i β, i.e., the α and β axis coordinates of i in αβ rectangular coordinate System
After irms calculation, a low-pass filter L PF is disposed to filter out high-frequency components in irms according to the requirement of protection operation accuracy, and ilp is obtained.
3) When the driving unit determines the driving voltage Vce when the IGBT is short-circuited and overcurrent, the voltage limit Vmax is not a constant value, and the logic thereof is as shown in fig. 4:
when the IGBT has a trigger signal, under the action of a driving voltage Vce monitoring enabling logic, a voltage limit value Vmax is a constant value; when there is no trigger signal, Vce monitor enable logic enables Vmax after a delay of about 1 μ s, when the drive voltage Vmax is determined by the external RC loop.
And the driving unit compares the collected driving voltage Vce with a voltage limit value Vmax, and if the driving voltage Vce is greater than the voltage limit value Vmax, the locking mark Blk _ s is output.
The driving unit receives positive jump of a blocking signal Blk sent by the main control unit through the optical fiber, or the driving unit judges the positive jump of a blocking mark Blk _ s, immediately starts a blocking logic, blocks the IGBT according to a preset turn-off strategy, and realizes the overcurrent protection of the IGBT.
In this embodiment, the method is already used in an actual SVG control system, fig. 5 is a rapid overcurrent protection action oscillogram in which the current jumps from being smaller than the IGBT current limit value Imax to being larger than Imax, and it is obvious that the overcurrent protection action delay is small under the implementation method.
In addition, with reference to the drawings and the above description, the IGBT integrated overcurrent protection system based on digital filtering of the present invention includes a main control unit and a driving unit. The main control unit is used for acquiring alternating current signals in real time, calculating to obtain a current effective value, comparing the current effective value with a preset IGBT current limit value in each calculation period, and when the current effective value is larger than the IGBT current limit value and smaller than a short-circuit threshold value current, sending an instruction to the driving unit by system overcurrent protection of the main control unit to turn off the IGBT; a drive unit for collecting drive voltage in real time, and turning off IGBT when the drive voltage is greater than the voltage limit value
The main control unit realizes system overcurrent protection based on digital filtering, the driving unit completes short circuit overcurrent protection, and the current constant values of the two overcurrent protection adopt high-low configuration to jointly complete the full-range rapid overcurrent protection function of the IGBT.
The method for realizing system overcurrent protection in the main control unit uses an all-pass digital filter to accurately shift the phase and attenuate the amplitude of a current instantaneous sampling value, realizes the single-phase crossing flow C L ARK conversion, obtains the vector value of a current signal, calculates the current effective value and the phase according to the vector value, and realizes the IGBT rapid overcurrent logic
The invention has been described in terms of preferred embodiments, but is not intended to be limited to the embodiments, and it is intended that all technical solutions obtained by substituting or converting equivalents thereof fall within the scope of the invention. .
Claims (2)
1. An IGBT comprehensive over-current protection method based on digital filtering is characterized in that:
the method comprises the steps that an alternating current signal is collected in real time through a main control unit, a current effective value is obtained through calculation, the current effective value is compared with a preset IGBT current limit value in each calculation period, and when the current effective value is larger than the IGBT current limit value and smaller than a short-circuit threshold value current, a system overcurrent protection of the main control unit sends an instruction to a driving unit to turn off the IGBT;
when the current of the IGBT is larger than the short-circuit threshold current, the IGBT is directly judged by the IGBT driving unit and is turned off; the judgment principle is that the IGBT driving unit collects driving voltage in real time, and when the driving voltage is larger than a voltage limit value, the IGBT is turned off;
the judgment of the overcurrent protection controlled by the main control unit comprises the following steps:
1-1), the main control unit collects an alternating current signal i, the alternating current signal i is filtered by a digital filter, the phase of a current sampling value is reduced in direction according to time change, one eighth of signal period is shifted, and the magnitude of the current signal is attenuated to
Doubling to obtain i β;
1-2), subtracting i β from the original current signal i to obtain i α;
1-3) calculating the effective value of the alternating current signal i to
1-4) and setting the current limit value Imax and effective value of the IGBT
By comparison, Imax is less than 3 points in succession
Outputting a locking mark Blk, and simultaneously transmitting the locking mark Blk to an IGBT driving unit through an optical fiber;
the judgment of the IGBT short-circuit overcurrent protection realized by the driving unit comprises the following steps:
2-1) determination of the voltage limit Vmax: when a trigger signal exists, under the action of the monitoring enabling logic of the driving voltage Vce, the voltage limit value Vmax is a constant value; when there is no trigger signal, the driving voltage Vce monitoring enable logic enables the voltage limit Vmax after a delay of about 1 μ s, where the voltage limit Vmax is determined by the external RC loop;
2-2) the driving unit compares the collected driving voltage Vce with a voltage limit value Vmax, and if the driving voltage Vce is greater than the voltage limit value Vmax, a locking mark Blk _ s is output;
the driving unit receives positive jump of a blocking signal Blk sent by the main control unit through the optical fiber, or the driving unit judges the positive jump of a blocking mark Blk _ s, immediately starts a blocking logic, blocks the IGBT according to a preset turn-off strategy, and realizes the overcurrent protection of the IGBT.
2. An IGBT comprehensive overcurrent protection system based on digital filtering is characterized by comprising:
the main control unit is used for acquiring alternating current signals in real time, calculating to obtain a current effective value, comparing the current effective value with a preset IGBT current limit value in each calculation period, and when the current effective value is larger than the IGBT current limit value and smaller than a short-circuit threshold value current, sending an instruction to the driving unit by system overcurrent protection of the main control unit to turn off the IGBT;
the driving unit is used for acquiring driving voltage in real time, and when the driving voltage is greater than a voltage limit value, the IGBT is turned off;
the main control unit realizes system overcurrent protection based on digital filtering, the drive unit completes short circuit overcurrent protection, and the current constant values of the two overcurrent protection adopt high-low configuration to jointly complete the full-range rapid overcurrent protection function of the IGBT;
the method for realizing the over-current protection of the system in the main control unit uses an all-pass digital filter to accurately shift the phase of a current instantaneous sampling value and attenuate the amplitude value, realizes the single-phase intersection flow C L ARK conversion, obtains the vector value of a current signal, calculates the current effective value and the phase according to the vector value, and realizes the rapid over-current logic of the IGBT.
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| 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 |
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