CN107290585A - Adapt to the high-accuracy voltage adjusting method of pulsed nonlinear load - Google Patents
Adapt to the high-accuracy voltage adjusting method of pulsed nonlinear load Download PDFInfo
- Publication number
- CN107290585A CN107290585A CN201610192398.2A CN201610192398A CN107290585A CN 107290585 A CN107290585 A CN 107290585A CN 201610192398 A CN201610192398 A CN 201610192398A CN 107290585 A CN107290585 A CN 107290585A
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- voltage
- sin
- adjusting method
- accuracy
- load
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Classifications
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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
- G01R19/02—Measuring effective values, i.e. root-mean-square values
Abstract
The invention provides a kind of high-accuracy voltage adjusting method for adapting to pulsed nonlinear load, by detecting three-phase voltage, virtual value is read by AC multipliers, by low pass filter, PID control adjusts PWM, the final high-power pipe output of control.Under any load, measurement signal will not lose higher harmonic components by AC multipliers and low pass filter.Voltage detecting uses three-phase effective value measurement mode, reduces to the full extent because the voltage accuracy caused by voltage waveform distortion is big is not enough and the problem of voltage instability, is particularly suitable for using under the occasion that nonlinear pulse is loaded.
Description
Technical field
The present invention relates to a kind of high-accuracy voltage adjusting method for adapting to pulsed nonlinear load.
Background technology
Nonlinear pulse is loaded, and such as electrical type and electric capacity, inductance energy-storage travelling wave tube, its electric C-V characteristic are non-linear,
So that contain substantial amounts of higher harmonic components in the voltage x current of load, the distortion of voltage current waveform non-sine；Same non-linear hour
Load is interrupted with impulse form to be occurred, and is equal to rapidly impact anticlimax load, pulsating load has high instantaneous power, humorous
Ripple content is high, and the electric power station system quality of power supply is brought greater impact.At the same time, higher want is proposed to voltage regulator
Ask.
Nonlinear pulse load voltage waveform can be expressed from the next：
U=U1sin(ωt+α1)+U2sin(2ωt+α2)+U3sin(3ωt+α3)+·
When voltage regulator uses measurement of average value mode, principle such as Fig. 1.
Under linear load, voltage waveform sine is good, and harmonic content is small, U ≈ U1sin(ωt+α1), measurement voltage is effective
It is worth and is：
Measuring average voltage is：
Uavg=k × Ur ms≈0.9×Ur ms。
(k=0.9 is constant)
Average voltage is measured, voltage linear, precision is guaranteed.
Under nonlinear load, voltage waveform distortion, harmonic content is very big, but by LPF after, U2, U3,
U4 ... Un higher harmonic components are filtered out.
AVR measures voltage：Uavg=k × Ur ms, k is variable.AVR measurement voltages can not form linear relationship, and precision can not
Ensure.
The signal of harmonic content very little higher hamonic wave is filtered out after low pass filter, causes the energy of measurement signal to damage
Lose, voltage regulator meeting erroneous judgement is forced down for external electrical increases excitation, causes generator output voltage to rise, parallel power point
It is big with deviation.Meanwhile, the nonlinear load of pulsed causes generator voltage harmonic content at times strong and at other times weak, voltage regulator measurement
It is low when high during signal, voltage pulsation is caused, stability in parallel is influenceed.
The content of the invention
In order to solve the above problems, the invention provides a kind of high-accuracy voltage regulation for adapting to pulsed nonlinear load
Method, control accuracy is high, stability is good, substantially improves system characteristic in parallel.
The present invention is realized by subordinate's technical scheme.
A kind of high-accuracy voltage adjusting method for adapting to pulsed nonlinear load, it is characterised in that step is as follows：
The first step：Line voltage is sampled through voltage transformer, and operational amplifier U11A-1# pin output instantaneous voltage is Uca,
U11B-7# pin output instantaneous voltage is Uab.
Second step：Voltage sampling signal reads virtual value through AC multipliers.
AC multiplier J1-5# output voltage instantaneous values are：
Uca=U1 sin(ωt+120°)+U2 sin(2ωt+120°)-U1 sin(ωt)-U1 sin(2ωt)…
Uab=U1 sin(ωt)-U1 sin(2ωt)-U1 sin(ωt-120°)-U2 sin(2ωt-120°)…
Uca and Uab expression formulas are substituted into after arranging,
K1 therein is coefficient.
3rd step：Instantaneous voltage is after low pass filter
It is square proportional to voltage effective value：
。
Under any load, measurement signal will not lose higher harmonic components.
Therefore, under the nonlinear load of pulsed, the effective value measurement voltage adjusting method control accuracy is high, stability
It is good, substantially improve system characteristic in parallel.
High-precision effective value measurement voltage regulator voltage detection uses three-phase effective value measurement mode, is averaged with traditional
Value metering system is compared, and voltage accuracy caused by voltage waveform distortion is big can be reduced to the full extent not enough and voltage instability
The problem of, it is particularly suitable for using under the occasion that nonlinear pulse is loaded.
Brief description of the drawings
Fig. 1 is measurement of average value mode theory diagram.
Fig. 2 is effective value measurement mode theory diagram.
Fig. 3 is the high-accuracy voltage adjusting method circuit diagram for adapting to pulsed nonlinear load.
Embodiment
A kind of high-accuracy voltage adjusting method for adapting to pulsed nonlinear load, as shown in Figures 2 and 3, step is as follows：
The first step：Line voltage is sampled through voltage transformer, and operational amplifier U11A-1# pin output instantaneous voltage is Uca,
U11B-7# pin output instantaneous voltage is Uab.
Second step：Voltage sampling signal reads virtual value through AC multipliers：
3rd step：Instantaneous voltage is after low pass filter
It is square proportional to voltage effective value,
Under any load, measurement signal will not lose higher harmonic components.
Claims (2)
1. a kind of high-accuracy voltage adjusting method for adapting to pulsed nonlinear load, it is characterised in that：By detecting three-phase electricity
Pressure, virtual value is read by AC multipliers, by low pass filter, and PID control adjusts PWM, and the final high-power pipe of control is defeated
Go out.
2. the high-accuracy voltage adjusting method according to claim 1 for adapting to pulsed nonlinear load, it is characterised in that：
Step is as follows：
The first step：Line voltage is sampled through voltage transformer, and operational amplifier U11A-1# pin output instantaneous voltage is Uca, U11B-
7# pin output instantaneous voltage is Uab；
Second step：Voltage sampling signal reads virtual value through AC multipliers,
AC multiplier J1-5# output voltage instantaneous values are：
Uca=U1sin(ωt+120°)+U2sin(2ωt+120°)-U1sin(ωt)-U1sin(2ωt)…
Uab=U1sin(ωt)-U1sin(2ωt)-U1sin(ωt-120°)-U2sin(2ωt-120°)…
Uca and Uab expression formulas are substituted into after arranging,
K1 therein is coefficient；
3rd step：Instantaneous voltage is after low pass filter
It is square proportional to voltage effective value：
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192398.2A CN107290585A (en) | 2016-03-30 | 2016-03-30 | Adapt to the high-accuracy voltage adjusting method of pulsed nonlinear load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610192398.2A CN107290585A (en) | 2016-03-30 | 2016-03-30 | Adapt to the high-accuracy voltage adjusting method of pulsed nonlinear load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107290585A true CN107290585A (en) | 2017-10-24 |
Family
ID=60087211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610192398.2A Pending CN107290585A (en) | 2016-03-30 | 2016-03-30 | Adapt to the high-accuracy voltage adjusting method of pulsed nonlinear load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107290585A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1607392A (en) * | 2003-10-14 | 2005-04-20 | 珠海炬力集成电路设计有限公司 | Voltage virtual value measuring method based on filter |
| CN102608402A (en) * | 2010-12-22 | 2012-07-25 | 爱特梅尔公司 | Measuring Sum of Squared Current |
-
2016
- 2016-03-30 CN CN201610192398.2A patent/CN107290585A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1607392A (en) * | 2003-10-14 | 2005-04-20 | 珠海炬力集成电路设计有限公司 | Voltage virtual value measuring method based on filter |
| CN102608402A (en) * | 2010-12-22 | 2012-07-25 | 爱特梅尔公司 | Measuring Sum of Squared Current |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171024 |
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| RJ01 | Rejection of invention patent application after publication |