CN103337982B - Based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis - Google Patents
Based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis Download PDFInfo
- Publication number
- CN103337982B CN103337982B CN201310290103.1A CN201310290103A CN103337982B CN 103337982 B CN103337982 B CN 103337982B CN 201310290103 A CN201310290103 A CN 201310290103A CN 103337982 B CN103337982 B CN 103337982B
- Authority
- CN
- China
- Prior art keywords
- zero point
- value
- double
- basis
- compensation
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 230000000694 effects Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
Landscapes
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis, comprise the following steps: A1, system initialization arrange that to compare zero point be 512；A2, entrance PWM interrupt routine；A3, judging the AD conversion value of Hall current sensor and compare the size of zero point, AD conversion value, more than comparing zero point, electric current forward, just compensates；AD conversion value is less than and compares zero point, electric current negative sense, negative compensation；A4, the pwm value calculated, assignment to pulse width register, waveform automatically generates.The present invention is by increasing by two benchmark zero points and can dynamically adjust and make low speed dead area compensation more accurate.
Description
Technical field
The present invention relates to a kind of universal frequency converter low-speed performance dead area compensation side based on " accurate pair of double-basis compares zero point "
Method.
Background technology
At present, along with the development of Power Electronic Technique, power device such as IGBT, MOSFET etc. are widely used in PWM and become
In current circuit.In PWM three-phase inverter, ideally, two switching devices up and down of each brachium pontis are strict in turn
Turn-on and turn-off.But practical situation is, the on, off of each device is required for the regular hour, when especially turning off
Between longer than ON time.In turn off process, if the device of cut-off turns at once, necessarily cause dc bus direct
Short circuit.In order to prevent this from occurring, it is necessary to introducing one section of Dead Time in driving signal, general inverter is in journey
Sequence artificially increases time delay in preferable control signal, postpones a period of time, be commonly referred to as Dead Time during this period of time.
In at this moment, the upper and lower switching device of brachium pontis does not the most trigger signal.Owing to artificially adding Dead Time in a program,
The output making inverter is not preferable PWM waveform, have impact on the practical effect of PWM scheme, and these are all in dead band
In the category of effects.The addition of Dead Time, have impact on inverter output voltage and output electric current, causes output electricity
There is error in pressure.This error is the important sources of harmonic wave, and it not only adds the loss of system, even may also result in and is
System instability.For motor driven systems, dead time effect can make motor output voltage under low speed light duty and defeated
Go out electric current generation Severe distortion, be not the sine wave of rule, motor torque ripple and harmonic wave can be caused.
The existence in dead band makes to export fundamental voltage and declines, and phase place changes, and low-order harmonic increases.Especially when output
Voltage or frequency the lowest in the case of, this impact will become extremely serious, and stator copper loss, iron loss dramatically increase, turn
Square pulsation also results in the instability of governing system, owing to this system often operates in low frequency state, it is therefore necessary to take one
Fixed indemnifying measure carrys out the impact of deadband eliminating effect.In order to make up the loss of the current potential that dead band is caused, it is necessary to by accurately
Judging the direction of output current phase, the service time that respective switch pipe is increased or decreased realizes.
The three-phase inverter main circuit of universal frequency converter is shown in accompanying drawing 1, as a example by U phase, when inverter output current flows out bridge
During arm, the change of current of upper underarm is carried out between the fly-wheel diode VD2 of VT1 and lower brachium pontis, and now VT2 reality does not rise
Effect, say, that work as iUDuring ＞ 0, U phase exports electric current and only flows through VT1 or VD2, even if VT2 conducting, electric current is also
Being not passed through VT2 (electric current one-way flow), now forward PWM ripple has just lacked a width is tdPulse, say, that
During dead band, output voltage has more a tdThe nagative potential of width；In like manner, when inverter output current flows to brachium pontis,
The change of current of upper and lower bridge arm is carried out between fly-wheel diode VD1 and VT2 of upper brachium pontis, and VT1 is the most inoperative, that is,
Work as iUDuring ＜ 0, U phase exports electric current and only flows through VT2 or afterflow VD1, even if VT1 conducting, it is (same that electric current is also not passed through VT1
Sample is because of electric current one-way flow), now negative sense PWM ripple has just lacked a width is tdPulse, say, that in the dead band phase
Between, output voltage has more a tdThe positive potential of width.Based on this principle, work as iUDuring ＞ 0, only need to be to upper brachium pontis
Break-make is controlled, and the ON time of VT1 is extended td, and the ON time of VT2 is shortened t by lower brachium pontisd, i.e.
The shutoff moment of VT1 postpones td, VT2 opens moment delay td, increasing a width is tdPositive pulse；In like manner,
Work as iUDuring ＜ 0, only the break-make of lower brachium pontis need to be controlled, by the turn on time delay t of VT2d, by the conducting of VT1
Time shortens td, i.e. the shutoff moment delay t of VT2d, VT1 opens moment delay td, increasing a width is td's
Positive pulse.
The shortcoming of prior art is can not accurately to detect current zero-crossing point, because there is high-frequency noise in current detecting passage,
When there being electric current to flow out, measured signal will be the superposition of current signal and HF noise signal；The existence of this error makes
The current polarity detected near zero-crossing point is the most different from actual polarity, it may appear that fluctuation, thus is difficult to accurately
Determine the position of zero crossing.Zero crossing position is inaccurate causes current polarity to make a mistake, and necessarily leads to dead band and compensates by mistake,
The most do not eliminate the artificial addition dead band impact on system, the impact on system can be increased the weight of on the contrary.
Summary of the invention
The technical problem to be solved is existing can not accurately to detect based in current polarity dead-zone compensation method
Current polarity, especially near zero-crossing point, causes dead area compensation abnormal and a kind of low speed dead area compensation scheme of proposing,
The method is simple, it is possible to accurately detect current zero-crossing point.
Technical scheme is as follows:
A kind of based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis, comprise the following steps:
A1, system initialization arrange that to compare zero point be 512；
A2, entrance PWM interrupt routine；
A3, judge the AD conversion value of Hall current sensor and compare the size of zero point, AD conversion value more than comparing zero point,
Electric current forward, just compensates；AD conversion value is less than and compares zero point, electric current negative sense, negative compensation；Described just compensate, pwm value
Deduct the compensation time, it is judged that AD value and the size of lower zero point, more than lower zero point, arrange and compare the value that zero point is lower zero point,
Arrange on the basis of benchmark zero point 0. 1 simultaneously；Described negative compensation, pwm value adds the compensation time, it is judged that AD value and upper zero
Point big, less than upper zero point, arranges and compares the value that zero point is upper zero point, arrange on the basis of benchmark zero point 0. 2 simultaneously；
A4, the pwm value calculated, assignment to pulse width register, waveform automatically generates.
The present invention proposes the low speed dead area compensation scheme based on " double-basis accurate double compares zero point ", compensate for using common double
The compensation scheme of zero point (two are compared zero point), the compensation caused is inaccurate, and three-phase compensates imbalance, especially in zero passage
Problem near point.By increasing by two benchmark zero points and can dynamically adjust and make low speed dead area compensation more accurate.
Accompanying drawing explanation
Fig. 1: universal frequency converter converter main circuit；
" accurate pair of double-basis compares zero point " schematic diagram of Fig. 2: the present invention；
The dead-zone compensation method flow chart of Fig. 3: the present invention；
Fig. 4: fc=6K, 1Hz uncompensation output voltage waveforms；
Fig. 5: fc=6K, 1Hz compensate output voltage wave；
Fig. 6: fc=15K, 0.5Hz compensate output voltage waveforms；
Fig. 7: fc=15K, 1Hz uncompensation output voltage waveforms；
Fig. 8: fc=15K, 1Hz compensate output voltage waveforms；
Fig. 9: fc=15K, 0.5Hz compensate output voltage waveforms；
Figure 10: fc=15K, 120Hz compensate output voltage waveforms；
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in detail.
The accurate double zero point schematic diagrams that compare of double-basis are shown in that the relation of Fig. 2: four zero points, two benchmark zero points represent output electric current and be
AD conversion value when of zero, should be 512 fixing (2.5V), according to substantial amounts of test the most in a program it
Making dynamic, the zero point of change, according to the set direction benchmark zero point compensated, this zero point and 512 errors of standard
Scope 0.4%, the effect of fine setting.Upper zero point and lower zero point determine that the moment of compensation, two electric currents of U, V in program
Under AD conversion value and upper zero point, zero point compares and compensates, and in program is that electric current AD conversion value compares, because AD
Conversion value has not gone through computing, and real-time is good, and W phase current values AD conversion value is according to benchmark zero point and U, V two
Electric current AD conversion is worth.
The accurate double flow charts comparing zero point dead-zone compensation method of double-basis are shown in Fig. 3: in the underflow interrupt routine of PWM, initially
It is 512 that galvanic current compares zero point value, represents ideal current zero crossing.Two benchmark zero points are increased in actual comparison procedure,
Benchmark zero point differs ± 0.4% with 512.Dead area compensation process is described as a example by U phase: whether judge U phase current sensing value
More than 512, if more than 512, showing electric current forward, just compensating, output pulse width deducts a compensation time,
Then judge to detect whether electric current is more than lower zero point value, if more than lower zero point value, under by current ratio relatively zero adjustment being now
Zero point, benchmark zero point is adjusted to benchmark 0. 1；If less than lower zero point value, comparing zero point and still use 512；If U phase is electric
Stream detected value is less than 512, and output pulse width increases by one and compensates the time, then judges whether to detect current value less than upper
Zero point, if less than upper zero point, will compare zero adjustment is upper zero point, and benchmark zero point is adjusted to benchmark 0. 2, if being more than
Upper zero point, compares zero point and benchmark zero point still uses 512；If current detection value is equal to 512, do not do dead area compensation.Extremely
District produces complementary pwm pulse signal to PWM register assignment after having compensated and gives inverter, to control motor.
The dead area compensation using " accurate pair of double-basis compares zero point " during universal frequency converter low speed is tested by the present invention.Fig. 4
Uncompensation output voltage waveforms when running for switching frequency 6KHz, 1Hz, as shown in Figure 4, the output of voltage is not sinusoidal
Ripple, it is unstable that this results in electric machine rotation, and motor just shake when of occurring raised or sunken in waveform, this makes motor
The poor performance when low speed, unstable.Some occasion can not use, such as medical recovery treadmill.Must be mended
Repay.Fig. 5 for using " double-basis is accurate double compare zero point " dead area compensation scheme after output voltage wave, as shown in Figure 5,
After having added dead area compensation, output voltage wave becomes sinusoidal wave, and the concavo-convex of waveform when not compensating all has been refilled,
So waveform is normal, and motor runs also the most normal, does not haves low jitter problem, and can be with low speed 0.5Hz
Running, Fig. 6 is 0.5Hz output voltage waveforms.Seldom there is converter can accomplish low speed 0.5Hz even running.
It is ruuning situation during 15K that the present invention also tests carrier frequency, output when seeing Fig. 7 and Fig. 8, Fig. 7 for not compensating
The waveform of voltage, Fig. 8 is to use " double-basis accurate double compare zero point " dead area compensation scheme after output voltage waveforms.Figure
9 output voltage waveforms when being 0.5Hz.From Fig. 6 and Fig. 8, converter carrier frequency is the highest, and the vibrations of motor are more
Little, run noise the least, it is the least that the motor feels hot.Carrier frequency is the highest, and output is the least.Pass through " accurate pair of double-basis
Relatively zero point " dead area compensation scheme, low speed output can be made to be greatly improved.Solve universal frequency converter well
Slowspeed machine jitter problem.The present invention has also done high-speed test (HST) except doing slow-speed test, and Figure 10 is carrier frequency 15K,
Output voltage waveforms when 120Hz runs, finds that during high speed, voltage waveform is intact sine wave, not because of dead area compensation
Cause the distortion of waveform, add that this compensation scheme does not interferes with the waveform of output voltage yet.So " double-basis is accurate double compares zero
Point " dead area compensation scheme just for universal frequency converter low-speed performance improve.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
And all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (1)
1., based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis, its feature exists
In, comprise the following steps:
A1, system initialization arrange that to compare zero point be 512；
A2, entrance PWM interrupt routine；
A3, judge the AD conversion value of Hall current sensor and compare the size of zero point, AD conversion value more than comparing zero point,
Electric current forward, just compensates；AD conversion value is less than and compares zero point, electric current negative sense, negative compensation；Described just compensate, pwm value
Deduct the compensation time, it is judged that AD value and the size of lower zero point, more than lower zero point, arrange and compare the value that zero point is lower zero point,
Arrange on the basis of benchmark zero point 0. 1 simultaneously；Described negative compensation, pwm value adds the compensation time, it is judged that AD value and upper zero
The size of point, less than upper zero point, arranges and compares the value that zero point is upper zero point, arranges on the basis of benchmark zero point 0. 2 simultaneously；
A4, the pwm value calculated, assignment to pulse width register, waveform automatically generates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310290103.1A CN103337982B (en) | 2013-07-10 | 2013-07-10 | Based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310290103.1A CN103337982B (en) | 2013-07-10 | 2013-07-10 | Based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103337982A CN103337982A (en) | 2013-10-02 |
| CN103337982B true CN103337982B (en) | 2016-08-24 |
Family
ID=49246098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310290103.1A Active CN103337982B (en) | 2013-07-10 | 2013-07-10 | Based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103337982B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10116201B2 (en) * | 2015-07-09 | 2018-10-30 | Constructions Electroniques + Télécommunications | High power density inverter (I) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101820231A (en) * | 2010-04-15 | 2010-09-01 | 浙江大学 | Current zero-crossing detection and dead zone compensation method used for frequency converter |
| CN102136803A (en) * | 2010-01-21 | 2011-07-27 | 深圳市汇川技术股份有限公司 | Pulse width modulation frequency variable power supply and dead zone compensation method thereof |
-
2013
- 2013-07-10 CN CN201310290103.1A patent/CN103337982B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136803A (en) * | 2010-01-21 | 2011-07-27 | 深圳市汇川技术股份有限公司 | Pulse width modulation frequency variable power supply and dead zone compensation method thereof |
| CN101820231A (en) * | 2010-04-15 | 2010-09-01 | 浙江大学 | Current zero-crossing detection and dead zone compensation method used for frequency converter |
Non-Patent Citations (2)
| Title |
|---|
| "变频器逆变单元死区效应分析及其补偿";王旭阳等;《通信电源技术》;20120525;第29卷(第3期);14-17页，图4 * |
| "应用TMS320F240DSP的变频调速器的研究";段龙;《中国优秀硕士学位论文全文数据库 工程科技II辑 2002年第1期》;20020615;28页，31页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103337982A (en) | 2013-10-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104122479B (en) | Online detection method for open-circuit faults of power tubes of induction-motor vector control system | |
| US9178454B2 (en) | Apparatus for controlling rotating machine based on output signal of resolver | |
| KR101622011B1 (en) | Method and apparatus for controlling of 3-phase ac motor | |
| US9429604B2 (en) | Three-phase AC phase sequence detecting method and apparatus | |
| Wu et al. | A fast and robust diagnostic method for multiple open-circuit faults of voltage-source inverters through line voltage magnitudes analysis | |
| CN103259487B (en) | The method of Frequency Converter Control motor and frequency converter | |
| CN103278727A (en) | Output power-based diagnosis method for open-circuit fault of insulated gate bipolar transistor (IGBT) of three-phase inverter | |
| CN110071669A (en) | A kind of permanent magnet synchronous motor vector controlled " dead time effect " compensation method | |
| KR101169797B1 (en) | Fault detecting system of stator winding of motor | |
| CN108092532A (en) | A kind of Inverter Dead-time compensation method based on PWM triggering end voltage samples | |
| US10605843B2 (en) | Inverter open/short failure detection | |
| KR101361408B1 (en) | Detecting method for shortage of coolant of electric water pump | |
| WO2010119661A1 (en) | Dc power-supply device and application system thereof | |
| CN107112922A (en) | Current transformer and the method for running current transformer | |
| Zhang | Current behavior-based open-switch fault on-line diagnosis of inverters in PMSM drive systems | |
| CN103337982B (en) | Based on the accurate double universal frequency converter low-speed performance dead-zone compensation methods comparing zero point of double-basis | |
| JP2015192578A (en) | Voltage detection device and voltage/current detection device | |
| JP5257594B2 (en) | Method and apparatus for generating switching signal of voltage type inverter | |
| CN102111083A (en) | Dead-time effect simulation modeling device of three-level inverter and method thereof | |
| CN104793161B (en) | Motor driven systems current sensor faults diagnostic method | |
| CN104506049B (en) | Control method of device for inhibiting transient fluctuation of inverter power supply output voltage | |
| JP2017093073A (en) | Power conversion apparatus | |
| CN113504435B (en) | Three-level inverter open-circuit fault diagnosis method and system | |
| CN105510825B (en) | A kind of asynchronous machine leakage inductance measuring method for eliminating non-linear factor | |
| CN107171541A (en) | A kind of New IGBT current feedback dead-zone compensation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210506 Address after: 321300 room 2401, 24 / F, Jintong building, Yongkang headquarters center, Jinhua City, Zhejiang Province Patentee after: ZHEJIANG ENVERTECH Corp.,Ltd. Address before: 030051 No. 3, Xueyuan Road, Shanxi, Taiyuan Patentee before: NORTH University OF CHINA |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240304 Address after: Room 401, Building 1, No. 138 Xinjun Ring Road, Minhang District, Shanghai, 201114 Patentee after: ENWO New Energy Technology (Shanghai) Co.,Ltd. Country or region after: China Address before: 321300 room 2401, 24 / F, Jintong building, Yongkang headquarters center, Jinhua City, Zhejiang Province Patentee before: ZHEJIANG ENVERTECH Corp.,Ltd. Country or region before: China |