CN103575975A - Constant-90-degree phase shift type reactive power measurement circuit - Google Patents
Constant-90-degree phase shift type reactive power measurement circuit Download PDFInfo
- Publication number
- CN103575975A CN103575975A CN201310550744.6A CN201310550744A CN103575975A CN 103575975 A CN103575975 A CN 103575975A CN 201310550744 A CN201310550744 A CN 201310550744A CN 103575975 A CN103575975 A CN 103575975A
- Authority
- CN
- China
- Prior art keywords
- circuit
- input end
- voltage
- frequency
- reactive power
- 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.)
- Pending
Links
Images
Landscapes
- Measuring Phase Differences (AREA)
Abstract
The invention discloses a constant-90-degree phase shift type reactive power measurement circuit which solves the problem that reactive power measurement precision is not high. The measurement circuit is characterized in that measured currents I[IN] in a measured circuit are connected with the input end of a current-voltage conversion circuit (1), the output end of the current-voltage conversion circuit (1) is connected with the first input end of a second multiplying circuit (5), voltage signals U[IN] in the measured circuit are connected with the input end of an integral circuit (2), the output end of the integral circuit is connected with the first input end of a first analog multiplication circuit (3), frequency signals f[UIN] in the measured circuit are connected with the input end of a frequency-voltage conversion circuit (3), the output end of the frequency-voltage conversion circuit is connected with the second input end of the first analog multiplication circuit, and the output end of the first analog multiplication circuit is connected with the second input end of a second analog multiplication circuit. According to the constant-90-degree phase shift type reactive power measurement circuit, the problem that the measurement precision is not high due to the fact that accuracy changes along with frequency change when a common analog circuit method is used for measuring the reactive power is solved.
Description
Technical field
The present invention relates to a kind of wattless power measurement circuit based on pure 90 degree phase shifts.
Background technology
At present, the wattless power measurement in electric line is undertaken by analogue means sometimes.This device adopts phase-moving method that the method that produces the additional phase error of 90 ° between tested electric current and tested voltage is measured more.Known phase-moving method is developed design mostly in frequency 50Hz situation at present.When frequency changes when very little near 50Hz, the phase change of the phase change of its leading phase shift link and hysteresis phase shift link can be cancelled out each other substantially, but the frequency compensation of this method is limited in scope.When frequency changes greatlyr near 50Hz, while reaching 45Hz or 55Hz, the additive error that phase change causes can surpass 0.3%, can not meet relevant criterion requirement.When the frequency input signal that existing standard GB/T 13850-1998 < < ac electric is converted to regulation reactive power transmitter in the electrical measurement transmitter > > of analog quantity or digital signal changes within the scope of 45 ~ 55Hz, its output change amount must not surpass class index, when class index is less than 0.3, said method can not meet the demands, and need to seek phase-moving method more accurately.
Summary of the invention
The invention provides a kind of pure 90 degree phase shift wattless power measurement circuit, solved the not high technical matters of reactive power measurement precision.
The present invention solves above technical matters by the following technical programs:
90 degree phase shift wattless power measurement circuit, comprise current-to-voltage converting circuit, integrating circuit, frequency-voltage conversion circuit, the first analog multiplication circuit, the second mlultiplying circuit, the measured current I in test line
iNbe connected with the input end of current-to-voltage converting circuit, the output terminal of current-to-voltage converting circuit is connected with the first input end of the second mlultiplying circuit; Voltage signal U in test line
iNbe connected with the input end of integrating circuit, the output of integrating circuit is connected with the first input end of the first analog multiplication circuit; Test line medium frequency signal f
uINbe connected with the input end of frequency-voltage conversion circuit, the output terminal of frequency-voltage conversion circuit is connected with the second input end of the first analog multiplication circuit; The output terminal of the first analog multiplication circuit is connected with the second input end of the second analog multiplication circuit, and the output signal of the second analog multiplication circuit is the voltage signal that single-phase reactive power reactive power is directly proportional.
When the present invention has fundamentally solved conventional mimic channel method measurement reactive power, accuracy changes with frequency change the problem that caused precision is not high.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail:
90 degree phase shift wattless power measurement circuit, comprise current-to-voltage converting circuit 1, integrating circuit 2, frequency-voltage conversion circuit 3, the first analog multiplication circuit 4, the second mlultiplying circuit 5, the measured current I in test line
iNbe connected with the input end of current-to-voltage converting circuit 1, the output terminal of current-to-voltage converting circuit 1 is connected with the first input end of the second mlultiplying circuit 5; Voltage signal U in test line
iNbe connected with the input end of integrating circuit 2, the output of integrating circuit 2 is connected with the first input end of the first analog multiplication circuit 4; Test line medium frequency signal f
uINbe connected with the input end of frequency-voltage conversion circuit 3, the output terminal of frequency-voltage conversion circuit 3 is connected with the second input end of the first analog multiplication circuit 4; The output terminal of the first analog multiplication circuit 4 is connected with the second input end of the second analog multiplication circuit 5, and the output signal of the second analog multiplication circuit 5 is the voltage signal that single-phase reactive power reactive power is directly proportional.
Concrete methods of realizing of the present invention is as follows:
The first step, 2 couples of input ac voltage U of employing integrating circuit
iNcarry out 90 ° of phase shifts, this phase shift is constant, with frequency change, does not change.Line voltage distribution
v iN be multiplied by the integrating resistor value of integrating circuit 2
r, then be multiplied by the scale-up factor of an integrating circuit 2
k x , then by the angular frequency of taking advantage of the result that obtains divided by voltage in test line
ω, then divided by the integration integrating capacitor value of integrating circuit 2
c,obtain the output voltage of integrating circuit 2
v x, formula is as follows:
V
X
=K
X
V
IN
R/ωC，
In formula
k x for adopting the scale-up factor of integrating circuit 2,
rfor the integrating resistor value of integrating circuit 2,
cfor the integration integrating capacitor value of integrating circuit 2, ω is the angular frequency of voltage in test line;
Second step, by the frequency signal f of input voltage
uINas the input of frequency/voltage change-over circuit 3, the result of its output
v y , can pass throughthe scale-up factor of frequency/voltage change-over circuit 3
k y be multiplied by the reference voltage (generally get 1-10V galvanic current and press numerical value) of frequency/voltage change-over circuit 3
v r1 , then be multiplied by the frequency of inputting test line voltage
f,its computing formula as shown in the formula:
V Y =K Y V R1 f ，
Wherein
v r1 for the reference voltage (generally get 1-10V galvanic current and press numerical value) of frequency/voltage change-over circuit 3,
k y for the scale-up factor (span is :) of frequency/voltage change-over circuit 3,
ffrequency for input test line voltage;
the 3rd step, V x , V y access first analog multiplication circuit 4, its output is the output by frequency/voltage change-over circuit 3
v y be multiplied by the output voltage of integrating circuit 2
v x again divided by the reference voltage of first analog multiplication circuit 4
v r2 (generally get 1-10V galvanic current and press numerical value) obtains after calculating, and its computing formula is shown in following formula:
V Z =V X V Y /V R2 ，
Wherein
v r2 for the reference voltage (generally get 1-10V galvanic current and press numerical value) of first analog multiplication circuit 4,
v y for the output of frequency/voltage change-over circuit 3,
v x for the output voltage of integrating circuit 2, calculate the output voltage of analog multiplication circuit 4
v z, its computing formula is shown in following formula:
V
Z
= V
IN
×K
X
K
Y
V
R1
R/2πCV
R2 ，
Can find out
v z one and input voltage
v iN proportional, with the voltage of frequency-independent.
The 4th step, by input current signal I
iNthrough current-to-voltage converting circuit 1, conversion is output into voltage signal;
The 5th step, with second analog multiplication circuit 5 by the output signal V of first analog multiplication circuit 4
zmultiply each other with the output voltage signal after integration through current-to-voltage converting circuit 1, complete single-phase reactive power and calculate.
Claims (1)
1. spend phase shift wattless power measurement circuit for one kind pure 90, comprise current-to-voltage converting circuit (1), integrating circuit (2), frequency-voltage conversion circuit (3), the first analog multiplication circuit (4), the second mlultiplying circuit (5), it is characterized in that the measured current I in test line
iNbe connected with the input end of current-to-voltage converting circuit (1), the output terminal of current-to-voltage converting circuit (1) is connected with the first input end of the second mlultiplying circuit (5); Voltage signal U in test line
iNbe connected with the input end of integrating circuit (2), the output of integrating circuit (2) is connected with the first input end of the first analog multiplication circuit (4); Test line medium frequency signal f
uINbe connected with the input end of frequency-voltage conversion circuit (3), the output terminal of frequency-voltage conversion circuit (3) is connected with the second input end of the first analog multiplication circuit (4); The output terminal of the first analog multiplication circuit (4) is connected with the second input end of the second analog multiplication circuit (5), and the output signal of the second analog multiplication circuit (5) is the voltage signal that single-phase reactive power reactive power is directly proportional.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310550744.6A CN103575975A (en) | 2013-11-09 | 2013-11-09 | Constant-90-degree phase shift type reactive power measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310550744.6A CN103575975A (en) | 2013-11-09 | 2013-11-09 | Constant-90-degree phase shift type reactive power measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103575975A true CN103575975A (en) | 2014-02-12 |
Family
ID=50048182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310550744.6A Pending CN103575975A (en) | 2013-11-09 | 2013-11-09 | Constant-90-degree phase shift type reactive power measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103575975A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158714A (en) * | 2015-08-12 | 2015-12-16 | 上海市计量测试技术研究院 | 90-degree phase standard circuit and method for obtaining 90-degree phase standard |
| CN108957118A (en) * | 2018-08-31 | 2018-12-07 | 东方电子股份有限公司 | A kind of reactive power calculating method |
| CN111308296A (en) * | 2020-04-16 | 2020-06-19 | 国网山西省电力公司电力科学研究院 | Method for evaluating state of valve plate of lightning arrester |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4620157A (en) * | 1984-06-22 | 1986-10-28 | Yokogawa Hokushin Electric Corporation | Reactive power to DC signal converter |
| JP2000329804A (en) * | 1999-05-20 | 2000-11-30 | Osaki Electric Co Ltd | Electronic reactive power measuring device |
| CN2611909Y (en) * | 2002-11-28 | 2004-04-14 | 上海贝岭股份有限公司 | Reactive power measuring circuit based on digit integration for carrying out phase shift |
| CN101995514A (en) * | 2009-08-27 | 2011-03-30 | 北京兴中芯电子科技有限公司 | Device and method for measuring reactiv power |
| CN102012456A (en) * | 2010-10-29 | 2011-04-13 | 东南大学 | Reactive power measurement method |
-
2013
- 2013-11-09 CN CN201310550744.6A patent/CN103575975A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4620157A (en) * | 1984-06-22 | 1986-10-28 | Yokogawa Hokushin Electric Corporation | Reactive power to DC signal converter |
| JP2000329804A (en) * | 1999-05-20 | 2000-11-30 | Osaki Electric Co Ltd | Electronic reactive power measuring device |
| CN2611909Y (en) * | 2002-11-28 | 2004-04-14 | 上海贝岭股份有限公司 | Reactive power measuring circuit based on digit integration for carrying out phase shift |
| CN101995514A (en) * | 2009-08-27 | 2011-03-30 | 北京兴中芯电子科技有限公司 | Device and method for measuring reactiv power |
| CN102012456A (en) * | 2010-10-29 | 2011-04-13 | 东南大学 | Reactive power measurement method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158714A (en) * | 2015-08-12 | 2015-12-16 | 上海市计量测试技术研究院 | 90-degree phase standard circuit and method for obtaining 90-degree phase standard |
| CN108957118A (en) * | 2018-08-31 | 2018-12-07 | 东方电子股份有限公司 | A kind of reactive power calculating method |
| CN111308296A (en) * | 2020-04-16 | 2020-06-19 | 国网山西省电力公司电力科学研究院 | Method for evaluating state of valve plate of lightning arrester |
| CN111308296B (en) * | 2020-04-16 | 2021-05-11 | 国网山西省电力公司电力科学研究院 | Method for evaluating state of valve plate of lightning arrester |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103018703B (en) | Current/voltage conversion traceability method for precision alternating current measurement | |
| CN105306056A (en) | Scale factor temperature compensating method of current frequency conversion circuit | |
| CN103575976B (en) | A kind of pure 90 degree of phase shift reactive power measuring methods | |
| CN101738593B (en) | Standard energy meter and correcting method of sampled signals thereof | |
| CN103575975A (en) | Constant-90-degree phase shift type reactive power measurement circuit | |
| CN201993457U (en) | Automatic calibrating apparatus for shunt | |
| CN102520384A (en) | Digital output electronic type mutual inductor conversion time delay test method | |
| CN104076226A (en) | Device and method for measuring energy efficiency of transformer based on voltage difference value and current difference value | |
| CN203164306U (en) | High precision grounding resistor testing instrument | |
| CN104345218A (en) | Reactance value measurement system and method for three-phase reactor | |
| CN203554443U (en) | An electric energy acquisition zero-voltage-drop fiber transmission apparatus achieved on the basis of full digitalized technology | |
| CN103487745A (en) | Automatic testing circuit of transforming amplifier and testing method | |
| CN109782057B (en) | Circuit and method for measuring input active power of single-phase power supply of variable-frequency household appliance | |
| CN103713185B (en) | The set end voltage measuring apparatus of alternating-current variable frequency motor | |
| CN103383415A (en) | Resistance and capacitance online testing circuit | |
| CN203894346U (en) | Cable power frequency parameter testing apparatus | |
| CN202189089U (en) | Voltage transformer secondary circuit voltage loss testing device | |
| CN203479987U (en) | Automatic test circuit for conversion amplifier | |
| CN203204048U (en) | Output voltage measurement circuit for high-voltage frequency converter | |
| CN103178708B (en) | Static charge source and method for calibrating same | |
| CN205982390U (en) | Adopt linear optical coupling to carry out device of high voltage DC sampling | |
| CN103293386B (en) | A kind of proving installation of insulation resistance and method | |
| CN104111370A (en) | Method for measuring zero-sequence current in three-phase ungrounded system | |
| CN204832382U (en) | Mutual -inductor measuring device and measurement system | |
| CN203732614U (en) | Terminal voltage measuring device of AC variable frequency motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140212 |