CN106684826B - A kind of Three-Phase PWM Rectifier algorithm boundary protection method based on SVPWM - Google Patents
A kind of Three-Phase PWM Rectifier algorithm boundary protection method based on SVPWM Download PDFInfo
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- CN106684826B CN106684826B CN201710147048.9A CN201710147048A CN106684826B CN 106684826 B CN106684826 B CN 106684826B CN 201710147048 A CN201710147048 A CN 201710147048A CN 106684826 B CN106684826 B CN 106684826B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
Abstract
The Three-Phase PWM Rectifier algorithm boundary protection method based on SVPWM that the invention proposes a kind of; CLARK transformation, the difference for command voltage vector, computations voltage vector and the transformed network voltage vector that calculating current ring exports are carried out, when difference is more than the threshold values of setting to network voltage vector including including; it is immediately performed protective program; IGBT is blocked, otherwise normal output order voltage vector.Three-Phase PWM Rectifier algorithm boundary protection method of the present invention based on SVPWM, it is possible to prevente effectively from damaging the IGBT of Three-Phase PWM Rectifier in the case where due to software debugging, external disturbance, wiring error, more quickly, reliably compared to overcurrent protection.
Description
Technical field
The present invention relates to electronic technology field, in particular to a kind of Three-Phase PWM Rectifier algorithm boundary based on SVPWM is protected
Maintaining method.
Background technique
SVPWM is the abbreviation of space vector pulse width modulation (Space Vector Pulse Width Modulation).
The main thought of SVPWM is with three-phase symmetrical motor stator sub-ideal magnetic linkage circle when the power supply of three-phase symmetrical sine voltage for reference
Standard makees switching appropriate with three-phase inverter difference switching mode, so that PWM wave is formed, to be formed by practical magnetic linkage arrow
Amount is round to track its accurate magnetic linkage.Traditional SPWM method is from the angle of power supply, to generate a Frequency Adjustable pressure regulation just
String wave power supply, and SVPWM method regards inversion system and asynchronous machine as an entirety to consider, model is fairly simple, also just
In the real-time control of microprocessor.The theoretical basis of SVPWM is the average value principle of equal effects, i.e., in a switch periods by pair
Basic voltage vectors are combined, and keep its average value equal with given voltage vector.Sometime, voltage vector rotates to certain
In a region, can by form the various combination of two adjacent non-zero vectors and zero vector in this region in time come
It arrives.The action time of two vectors applies several times within a sampling period, thus when controlling the effect of each voltage vector
Between, make space vector of voltage close to rotating by Circular test, goes to approach ideal by actual magnetic flux caused by different switch states
Magnetic flux circle simultaneously determines switch state by the comparison result of the two, to form PWM waveform.The control method dynamic is good, tool
Have that DC voltage utilization rate is high, harmonic wave is small, effectively using input voltage, and can be reduced harmonic loss, and be easy to micro process
The advantages that digital form of device is realized.
Three-Phase PWM Rectifier generally uses three-phase IGBT bridge arm to pass through the topological structure of inductance connection to power grid.For this
Class PWM rectifier, the bigger net side inductance of power can be smaller, such as the PWM rectifier of a 200kW, net side inductance are generally small
In 1mH, the impedance for corresponding to 50Hz is also very small, once the voltage of rectifier converter output error for some reason, such as
Converter caused by measurement and detection signal are interfered calculates output error, will lead to voltage across the inductor deviation very
Greatly, so as to cause serious overcurrent or short-circuit conditions.Rectifier may export opposite voltage and lead to IGBT under extreme case
Moment demolition.
Summary of the invention
The technical problem to be solved by the present invention is providing a kind of Three-Phase PWM Rectifier algorithm boundary protection based on SVPWM
Method can effectively avoid damaging Three-Phase PWM Rectifier in the case where due to software debugging, external disturbance, wiring error
IGBT, more quickly, reliably compared to overcurrent protection.
Solution of the invention is achieved in that a kind of Three-Phase PWM Rectifier algorithm boundary protection based on SVPWM
Method, comprising the following steps:
S1, CLARK transformation is carried out to network voltage vector, it is false by network voltage vector to two-phase stationary coordinate system
If transformed network voltage vector is
The command voltage vector that S2, calculating current ring export calculates control voltage vector by controlling program current ring
It is inputted as SVPWM module, it is assumed that the command voltage vector of the electric current loop of PWM rectifier output is
The difference of S3, computations voltage vector and transformed network voltage vector,And
Calculate Δ vαβAmplitude | Δ vαβ|；
S4, as | Δ vαβ| it is more thanWhen, it is immediately performed protective program, blocks IGBT, otherwise normal output refers to
Enable voltage vector；
Wherein, LfFor net side inductance,For maximum protection current phasor, ω is electrical network angular frequency.
Another technical solution of the invention be it is above-mentioned basis on, the maximum protection current phasorFor net
Twice of side rated current maximum value.
Another technical solution of the invention be it is above-mentioned basis on, when PWM rectifier under steady state conditions, electric current is
The peak value of the sine wave of 50Hz, electric current is
Another technical solution of the invention is that on above-mentioned basis, the Three-Phase PWM Rectifier includes IGBT bridge arm,
Net side inductance L in triple line is setfWith input main contactor KM1, the precharge in parallel with the input main contactor KM1
Contactor KM2, the dc-link capacitance C1 being connected with DC bus both ends.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that of the present invention based on SVPWM
Three-Phase PWM Rectifier algorithm boundary protection method, this method control software by the voltage instruction exported to SVPWM module it
Preceding to be compared with network voltage, whether difference is more than setting boundary between decision instruction voltage vector and network voltage vector,
Once being then immediately performed protective program it was found that voltage deviation exceeds boundary, IGBT, backed off after random operating status are blocked.Institute of the present invention
The Three-Phase PWM Rectifier algorithm boundary protection method based on SVPWM stated, it is possible to prevente effectively from since software debugging, outside are dry
It disturbs, the IGBT of damage Three-Phase PWM Rectifier more quickly, reliably compared to overcurrent protection has very in the case where wiring error
Important practical value.
Detailed description of the invention
The attached drawing for constituting a part of the invention is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.
Fig. 1 is the stream of the Three-Phase PWM Rectifier algorithm boundary protection method based on SVPWM in one embodiment of the present invention
Cheng Tu；
Fig. 2 is the schematic diagram of Three-Phase PWM Rectifier in boundary protection method shown in Fig. 1.
Specific embodiment
Present invention will now be described in detail with reference to the accompanying drawings., the description of this part be only it is exemplary and explanatory, do not answer
There is any restriction effect to protection scope of the present invention.In addition, description of the those skilled in the art according to this document, it can be right
Feature in this document in embodiment and in different embodiments carries out the corresponding combination.
Description and claims of this specification and term " first ", " second ", " third " " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so as to the embodiment of the present invention described herein, such as can be with
Sequence other than those of illustrating or describing herein is implemented.In addition, term " includes " and " having " and their times
What is deformed, it is intended that cover it is non-exclusive include, for example, contain the process, method of a series of steps or units, system,
Product or equipment those of are not necessarily limited to be clearly listed step or unit, but may include be not clearly listed or for
The intrinsic other step or units of these process, methods, product or equipment.
The embodiment of the present invention is as follows, as depicted in figs. 1 and 2, a kind of Three-Phase PWM Rectifier algorithm boundary based on SVPWM
Guard method, comprising the following steps:
S1, CLARK transformation is carried out to network voltage vector, it is false by network voltage vector to two-phase stationary coordinate system
If transformed network voltage vector is
The command voltage vector that S2, calculating current ring export calculates control voltage vector by controlling program current ring
It is inputted as SVPWM module, it is assumed that the command voltage vector of the electric current loop of PWM rectifier output is
The difference of S3, computations voltage vector and transformed network voltage vector,And
Calculate Δ vαβAmplitude | Δ vαβ|；
S4, as | Δ vαβ| it is more thanWhen, it is immediately performed protective program, blocks IGBT, otherwise normal output refers to
Enable voltage vector；
Wherein, LfFor net side inductance,For maximum protection current phasor, ω is electrical network angular frequency.
According to the ability to bear of IGBT,Maximum protection electric current can be set as twice of rated current maximum value surely.?
Under steady state conditions, electric current is the sine wave of 50Hz to PWM rectifier, and current peak isHave
For in a switch periods.According toWhen due to using SVPWM, VbusΔ t=Δ vαβTs=LfΔi.Become
Change form:As Δ vαβWhen limiting in a certain range, this electric current is maximum current in a switch periods
Variation.Both sides modulus can obtain:Therefore limitation maximum differential pressure, actually also limits a switch
Largest current change in period.
It should be noted that carrying out CLARK transformation to network voltage vector, it is known transform method, will be separated by
The Alternating Current Power Supply of 120 ° of three-phase symmetrical is transformed into the Alternating Current Power Supply that two-phase thinks 90 ° of interval.Specific conversion process repeats no more.
In addition, the protective program of execution can be existing program in the step S4, IGBT need to only be blocked, at this
Also it is not described in detail.
On the basis of the above embodiments, in another embodiment of the present invention, as shown in Fig. 2, the Three-Phase PWM Rectifier can
To include IGBT bridge arm；Net side inductance L in triple line is setfWith input main contactor KM1, the net side inductance Lf, cooperation
IGBT is controlled for PWM rectified current；The pre-charge contactor KM2 in parallel with the input main contactor KM1, connects with precharge
Precharge the current-limiting resistance HR1, HR2, HR3 that tentaculum KM2 is respectively connected in series；The dc-link capacitance being connected with DC bus both ends
C1 is supported for busbar voltage.
Specifically, for example, rectifier net side inductance is 1mH, net side voltage rating virtual value 380V, rectifier net side is specified
Current peak is 100A, maximum protection current limitFor 200A, network voltage frequency is 50Hz, can be calculated
Electrical network angular frequency ω is 2 × 3.14 × 50=314.Assuming that rectifier switch frequency is 4kHz, corresponding switch periods TsFor
0.00025s.It can be calculated by formula calculated aboveTherefore inductance both ends pressure difference can be limited
Amplitude should be less than 62.8V.The largest current change in a switch periods | Δ imax| it is 62.8 × 0.00025/0.001=
15.7A.Starting protection program when boundary protection Programmable detection is greater than 62.8V to inductance both ends pressure difference, blocks IGBT, reaches in advance
The purpose of protection.For another example, it is consistent with network voltage that rectifier output voltage should be controlled in idle running, to control electric current
Near zero.Cause command voltage direction reversed for some reason, actual loaded voltage across the inductor is twice of network voltage,
Inductive current maximum rising value in a switch periods at this time | Δ imax| it is 536*2 × 0.00025/0.001=268A, this
Electric current seriously bears electric current more than IGBT, and is generally unable to satisfy requirement by detecting the method rapidity that electric current is protected,
It is unable to trigger protection in this switch periods, IGBT may be burnt in second switch periods.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that of the present invention based on SVPWM
Three-Phase PWM Rectifier algorithm boundary protection method, this method control software by the voltage instruction exported to SVPWM module it
Preceding to be compared with network voltage, whether difference is more than setting boundary between decision instruction voltage vector and network voltage vector,
Once being then immediately performed protective program it was found that voltage deviation exceeds boundary, IGBT, backed off after random operating status are blocked.Institute of the present invention
The Three-Phase PWM Rectifier algorithm boundary protection method based on SVPWM stated, it is possible to prevente effectively from since software debugging, outside are dry
It disturbs, the IGBT of damage Three-Phase PWM Rectifier more quickly, reliably compared to overcurrent protection has very in the case where wiring error
Important practical value.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of Three-Phase PWM Rectifier algorithm boundary protection method based on SVPWM, which comprises the following steps:
S1, CLARK transformation is carried out to network voltage vector, by network voltage vector to two-phase stationary coordinate system, it is assumed that become
Network voltage vector after changing is
The command voltage vector that S2, calculating current ring export calculates control voltage vector conduct by controlling program current ring
SVPWM module input, it is assumed that PWM rectifier electric current loop output command voltage vector be
The difference of S3, computations voltage vector and transformed network voltage vector,And it calculates
ΔvαβAmplitude | Δ vαβ|；
S4, as | Δ vαβ| it is more thanWhen, it is immediately performed protective program, blocks IGBT, otherwise normal output order electricity
Press vector；
Wherein, LfFor net side inductance,For maximum protection current phasor, ω is electrical network angular frequency.
2. the Three-Phase PWM Rectifier algorithm boundary protection method according to claim 1 based on SVPWM, which is characterized in that
The maximum protection current phasorIt is twice of net side rated current maximum value.
3. the Three-Phase PWM Rectifier algorithm boundary protection method according to claim 1 based on SVPWM, which is characterized in that
When PWM rectifier under steady state conditions, electric current is the sine wave of 50Hz, and the peak value of electric current is
4. the Three-Phase PWM Rectifier algorithm boundary protection method according to any one of claim 1 to 3 based on SVPWM,
It is characterized in that, the Three-Phase PWM Rectifier includes IGBT bridge arm, the net side inductance L in triple line is setfMaster connects with input
Tentaculum KM1, the pre-charge contactor KM2 in parallel with the input main contactor KM1, the direct current being connected with DC bus both ends are female
Line capacitance C1.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259284A (en) * | 2013-04-22 | 2013-08-21 | 华中科技大学 | Voltage vector stabilizer based on phase-locked loop and control method of voltage vector stabilizer |
| CN103280811A (en) * | 2013-06-14 | 2013-09-04 | 湖南大学 | Novel power quality control system with fault current-limiting function and control method thereof |
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| KR100886194B1 (en) * | 2007-06-08 | 2009-02-27 | 한국전기연구원 | Controller of double-fed induction generator |
| GB201114868D0 (en) * | 2011-08-30 | 2011-10-12 | Rolls Royce Plc | Method of controlling an inverter and a controller for controlling an inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103259284A (en) * | 2013-04-22 | 2013-08-21 | 华中科技大学 | Voltage vector stabilizer based on phase-locked loop and control method of voltage vector stabilizer |
| CN103280811A (en) * | 2013-06-14 | 2013-09-04 | 湖南大学 | Novel power quality control system with fault current-limiting function and control method thereof |
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Effective date of registration: 20210120 Address after: 411100 No.28 Baishi Road, Jingkai District, Xiangtan City, Hunan Province Patentee after: WASION ENERGY INDUSTRY TECHNOLOGY Co.,Ltd. Address before: 410205 No.11 workshop of Weisheng Science Park Phase II project, no.468 tongzipo West Road, national high tech Industrial Development Zone, Changsha City, Hunan Province Patentee before: HUNAN LINENG TECHNOLOGY Co.,Ltd. |
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