CN107831366A - The method for obtaining power network single-phase voltage phase - Google Patents
The method for obtaining power network single-phase voltage phase Download PDFInfo
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- CN107831366A CN107831366A CN201711061422.XA CN201711061422A CN107831366A CN 107831366 A CN107831366 A CN 107831366A CN 201711061422 A CN201711061422 A CN 201711061422A CN 107831366 A CN107831366 A CN 107831366A
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- phase
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- voltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
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- General Physics & Mathematics (AREA)
- Rectifiers (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The present invention relates to the computational methods of single-phase voltage phase, the method for specially obtaining power network single-phase voltage phase.Phase existing for solving the technical scheme of existing acquisition power network single-phase voltage phase obtains that the degree of accuracy is high, low-response, more sensitive to system frequency change, the problem of being not suitable for dynamic performance requirements high occasion.This method is realized by following steps：1) line voltage U is gatheredsAnd obtain the DC component v under rotating coordinate systemd、vq；2) be eliminated the DC components of two harmonics3) with
Description
Technical field
The present invention relates to the computational methods of single-phase voltage phase, the method for specially obtaining power network single-phase voltage phase.
Background technology
In electric locomotive, in the control of PWM rectifier, to realize that its net side active and reactive power is controlled, it is necessary to dynamic
Obtain electric network voltage phase information.One of existing acquisition single-phase voltage phase method is the open loop phaselocked loop based on low pass filter
Scheme, horizontal lock is entered to line voltage using phaselocked loop.In practical application, particularly in electric locomotive, the electricity of power network
Energy quality and environment are unsatisfactory, the problems such as SPA sudden phase anomalies, Voltage Drop, frequency change harmonic pollution be present, based on low pass
The phase of the open loop phaselocked loop scheme of wave filter obtains the not high degree of accuracy, low-response, discomfort more sensitive to system frequency change
Preferably it is used for the high occasion of dynamic performance requirements.The two of method are the closed loop phase lock ring scheme based on multiplication phase discriminator, and this method is
Preferable control, filters two harmonics, is usually added into low pass filter, so as to introduce phase delay and amplitude attenuation,
The performance and precision of phaselocked loop have a great influence.
The content of the invention
The technical scheme of the invention for solving the problems, such as existing acquisition power network single-phase voltage phase exists and defect, there is provided a kind of
The method for obtaining power network single-phase voltage phase, this method use the closed loop phase lock ring that a kind of software is realized, phase occur in power network
In the case that mutation, frequency transformation scope are wide, stable and accurate acquisition voltage on line side phase is remained to.
The present invention adopts the following technical scheme that realization：The method for obtaining power network single-phase voltage phase, is by walking as follows
Suddenly realize：
1) line voltage U is gathereds, coordinate system transformation calculating is carried out to the line voltage collected, obtains rotating coordinate system
Under DC component vd、vq, wherein translation-angle use any value estimated angle
2) according to estimated angleCalculate two harmonicsUse it for eliminating vd、vqIn two
Harmonic, the DC component for two harmonics that have been eliminated
3) withPI closed loop controllers are formed as input with value of zero, willCommand value be set to zero so that d axles
It is completely superposed in line voltage Us, form the tracking to electric network voltage phase；Passing through willCommand value be set to zero and pass through PI
Closed loop controller, overcome the estimated angle in step 1)Value error, even if estimated angleConvergence line voltage Us's
Phase, and form the tracking to electric network voltage phase；
4) output that angular velocity omega is incorporated into PI closed loop controllers forms feedforward disturbance, feedforward disturbance and PI controllers
Output is compared and (made the difference) to be inputted to integral element afterwards, and the output of integral element is line voltage UsPhase angle, wherein angle
Speed omega=2 π f, f is are gathered line voltage UsFrequency.
The method of the present invention for obtaining power network single-phase voltage phase uses the closed loop phase lock ring that a kind of software is realized,
The control for the PWM rectifier in electric locomotive of being particularly suitable for use in, which raises the dynamic response performance of phaselocked loop, and it is prominent to reduce net pressure
During change, system over-current phenomenon avoidance；Systematic steady state precision and power factor are improved, current waveform harmonic characterisitic improves；Do not increase volume
Outer hardware facility, reduce equipment cost；Phase Tracking scope is wide, and reduce phase place change influences on the stability of a system.This hair
Bright accomplished on 1.2MW high-power factory rectifiers, result of the test shows, the phase calculation of phaselocked loop can be prominent in net pressure
Become, during SPA sudden phase anomalies, there is preferable dynamic response performance and stable state accuracy.The present invention may also apply to the list under other environment
The acquisition of phase voltage phase.
Embodiment
The method for obtaining power network single-phase voltage phase, is realized by following steps：
1) line voltage U is gathereds, coordinate system transformation calculating is carried out to the line voltage collected, obtains rotational coordinates
DC component v under systemd、vq, wherein translation-angle use any value estimated angle
2) according to estimated angleCalculate two harmonicsUse it for eliminating vd、vqIn two
Harmonic, the DC component for two harmonics that have been eliminated
3) withPI closed loop controllers are formed as input with value of zero, willCommand value be set to zero so that d axles
It is completely superposed in line voltage Us, form the tracking to electric network voltage phase；Passing through willCommand value be set to zero and pass through PI
Closed loop controller, overcome the estimated angle in step 1)Value error, even if estimated angleConvergence line voltage Us's
Phase, and form the tracking to electric network voltage phase；
4) output that angular velocity omega is incorporated into PI closed loop controllers forms feedforward disturbance, feedforward disturbance and PI controllers
Inputted after output to integral element, the output of integral element is line voltage UsPhase angle, wherein angular velocity omega
=2 π f, f is are gathered line voltage UsFrequency.
Claims (1)
- A kind of 1. method for obtaining power network single-phase voltage phase, it is characterised in that realized by following steps：1) line voltage U is gathereds, coordinate system transformation calculating is carried out to the line voltage collected, obtained under rotating coordinate system DC component vd、vq, wherein translation-angle use any value estimated angle2) according to estimated angleCalculate two harmonicsUse it for eliminating vd、vqIn two frequencys multiplication Component, the DC component for two harmonics that have been eliminated3) withPI closed loop controllers are formed as input with value of zero, willCommand value be set to zero so that d axles are complete Overlap in line voltage Us, form the tracking to electric network voltage phase；Passing through willCommand value be set to zero and pass through PI closed loops Controller, overcome the estimated angle in step 1)Value error, even if estimated angleConvergence line voltage UsPhase, And form the tracking to electric network voltage phase；4) output that angular velocity omega is incorporated into PI closed loop controllers forms feedforward disturbance, feedforward disturbance and the output of PI controllers After input to integral element, the output of integral element is line voltage UsPhase angle, wherein the angular velocity omega that feedovers =2 π f, f is are gathered line voltage UsFrequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711061422.XA CN107831366B (en) | 2017-11-02 | 2017-11-02 | Method for obtaining single-phase voltage phase of power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711061422.XA CN107831366B (en) | 2017-11-02 | 2017-11-02 | Method for obtaining single-phase voltage phase of power grid |
Publications (2)
| Publication Number | Publication Date |
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| CN107831366A true CN107831366A (en) | 2018-03-23 |
| CN107831366B CN107831366B (en) | 2020-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711061422.XA Active CN107831366B (en) | 2017-11-02 | 2017-11-02 | Method for obtaining single-phase voltage phase of power grid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308326A (en) * | 2019-07-15 | 2019-10-08 | 国网山西省电力公司电力科学研究院 | A method of open loop can be improved and surveys phase algorithm noiseproof feature |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060146582A1 (en) * | 2004-12-31 | 2006-07-06 | Pao-Chuan Lin | Islanding detection method |
| CN104076204A (en) * | 2014-07-25 | 2014-10-01 | 山东泰开电力电子有限公司 | Phase extraction method applied to active power filter |
| CN104467823A (en) * | 2014-11-13 | 2015-03-25 | 天津电气科学研究院有限公司 | Software phase locked loop improving method |
| CN106410858A (en) * | 2016-08-30 | 2017-02-15 | 成都麦隆电气有限公司 | Software digital phase-locking method based on dual dq coordination conversion |
-
2017
- 2017-11-02 CN CN201711061422.XA patent/CN107831366B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060146582A1 (en) * | 2004-12-31 | 2006-07-06 | Pao-Chuan Lin | Islanding detection method |
| CN104076204A (en) * | 2014-07-25 | 2014-10-01 | 山东泰开电力电子有限公司 | Phase extraction method applied to active power filter |
| CN104467823A (en) * | 2014-11-13 | 2015-03-25 | 天津电气科学研究院有限公司 | Software phase locked loop improving method |
| CN106410858A (en) * | 2016-08-30 | 2017-02-15 | 成都麦隆电气有限公司 | Software digital phase-locking method based on dual dq coordination conversion |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308326A (en) * | 2019-07-15 | 2019-10-08 | 国网山西省电力公司电力科学研究院 | A method of open loop can be improved and surveys phase algorithm noiseproof feature |
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| CN107831366B (en) | 2020-06-09 |
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