CN106018927B - A kind of phase three-wire three phase-voltage measurement method - Google Patents
A kind of phase three-wire three phase-voltage measurement method Download PDFInfo
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- CN106018927B CN106018927B CN201610463623.1A CN201610463623A CN106018927B CN 106018927 B CN106018927 B CN 106018927B CN 201610463623 A CN201610463623 A CN 201610463623A CN 106018927 B CN106018927 B CN 106018927B
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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
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
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Abstract
The present invention relates to a kind of phase three-wire three phase-voltage measurement methods, use line phase inversion algorithm, locking phase and reference voltage construction, separation amplitude and reconstructed amplitude successively, by line voltage real-time sampling data accurate reproduction go out phase voltage virtual value.The phase-voltage measurement of uneven three-phase three wire system may be implemented in the present invention, it might even be possible to realize that three-phase three wire system falls and mutually detect；Simple and practical, strong antijamming capability of the invention, can rapidly obtain the phase sequence information of three-phase electricity.
Description
Technical field
The present invention relates to a kind of phase-voltage measurement method, especially a kind of phase three-wire three phase-voltage measurement method.
Background technology
The network voltage sampling of gird-connected inverter is sampled using line voltage, then using the line voltage of sampling as sentencing
Determine the value of network voltage response, this method can accurately carry out grid responsive, but work as in three-phase voltage changes in balance
When single-phase or two-phase changes, the line voltage that actual samples are returned not is to change according to setting phase voltage linear scale, from
The requirement that will meet without complying with standard defined any phase.
However, for theory, under non-equilibrium three-phase voltage input condition, due to the missing of zero curve, sampled voltage number
Residual voltage in can not detect, to can not accurately restore phase voltage from three-phase line voltage sampling data results at all
Value.
Invention content
In view of this, the purpose of the present invention is to propose to a kind of phase three-wire three phase-voltage measurement method, line voltage can be passed through
Real-time sampling data accurate reproduction goes out the virtual value of phase voltage.
The present invention is realized using following scheme：A kind of phase three-wire three phase-voltage measurement method, the phase three-wire three are without zero
Linear system is united, and following steps are specifically included：
Step S1：Three-phase line voltage signal u is obtained in real timeab、ubc、uca；
Step S2：By three-phase line voltage signal uab、ubc、ucaIt is calculated into line phase inversion, obtains line phase inversion voltage u'a, u'b,
u'c：
Step S3：Grid-connected locking phase obtains the locking phase ω of phase voltage, and constructs three-phase reference voltage
Step S4：It is accumulated after the line phase inversion voltage of step S2 is carried out product with the three-phase reference voltage that step S3 is constructed
Point, obtain the amplitude U' of AC powera, U'b, U'c：
Step S5：It is reconstructed by matrix inverse transformation and obtains three-phase input phase voltage amplitude Ua, Ub, Uc：
Compared with prior art, the present invention has following advantageous effect：
1, the present invention can be gone out in the three-phase three wire system of no zero curve by line voltage real-time sampling data accurate reproduction
Phase voltage virtual value；
2, the phase-voltage measurement of uneven three-phase three wire system may be implemented in the present invention, it might even be possible to realize phase three-wire three system
System falls mutually to detect；
3, simple and practical, strong antijamming capability of the invention, can rapidly obtain the phase sequence information of three-phase electricity.
Description of the drawings
Fig. 1 is phase three-wire three phase voltage peak detection principle schematic of the embodiment of the present invention.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings and embodiments.
As shown in Figure 1, present embodiments providing a kind of phase three-wire three phase-voltage measurement method, the phase three-wire three is without zero
Linear system is united, and following steps are specifically included：
Step S1：Three-phase line voltage signal u is obtained in real timeab、ubc、uca；
Step S2：By three-phase line voltage signal uab、ubc、ucaIt is calculated into line phase inversion, obtains line phase inversion voltage u'a, u'b,
u'c：
Step S3：Grid-connected locking phase obtains the locking phase ω of phase voltage, and constructs three-phase reference voltage
Step S4：It is accumulated after the line phase inversion voltage of step S2 is carried out product with the three-phase reference voltage that step S3 is constructed
Point, obtain the amplitude U' of AC powera, U'b, U'c：
Step S5：It is reconstructed by matrix inverse transformation and obtains three-phase input phase voltage amplitude Ua, Ub, Uc：
Preferably, as shown in Figure 1, the phase three-wire three phase voltage peak detection principle of the present embodiment mainly by：Line phase inversion is calculated
A few step compositions such as method, locking phase and reference voltage construction, separation amplitude, reconstructed amplitude, each algorithm principle are analyzed as follows.
1, line phase inversion algorithm
If tested input phase voltage is ua、ub、uc, then input line voltage be：
I.e.：
In formula,
If matrix M is nonsingular matrix, the calculating for realizing line voltage to phase voltage of inverting can be used.But just because of
Matrix M is singular matrix (| M |=0), without inverse matrix, therefore theoretically for, sampling line voltage value is impossible accurately also
Original goes out phase voltage value.According to matrix theory, for singular equation, still can be found most by the generalized inverse of singular matrix
The best fit approximation solution of small norm Least, i.e.,：
In formula, M+It is M+number inverse, i.e.,
A phases are taken to check above formula, i.e.,：
In formula,For three-phase residual voltage.It can be seen that the phase voltage as obtained by above formula reduction and former phase
A poor residual voltage between voltage.Above formula expansion can be obtained：
2, locking phase and reference voltage construction
The phase information that digital servo-control obtains input phase voltage is carried out using input line voltage, as a result, it can be with according to locking phase
Construct three-phase reference voltage：
3, amplitude is detached
The product that phase voltage is constructed using line phase inversion voltage and locking phase carries out the amplitude point that alternating voltage may be implemented in integral
From its main calculating is completed using cycle integrated：
Above formula is calculated, can be obtained：
Therefore, the every phase reference voltage constructed in formula is carried out detaching calculating per phase amplitude with sampling line phase inversion voltage-type,
It can obtain：
I.e.
Above formula shows the relationship between amplitude separation algorithm result of calculation and three-phase input voltage amplitude.
According to above formula result of calculation, three-phase input voltage amplitude can be reconstructed by inverse of a matrix transformation again, i.e.,：
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification should all belong to the covering scope of the present invention.
Claims (1)
1. a kind of phase three-wire three phase-voltage measurement method, the phase three-wire three is system without zero, it is characterised in that：Including following
Step：
Step S1：Three-phase line voltage signal u is obtained in real timeab、ubc、uca；
Step S2：By three-phase line voltage signal uab、ubc、ucaIt is calculated into line phase inversion, obtains line phase inversion voltage u'a, u'b, u'c：
Step S3：Grid-connected locking phase obtains the locking phase ω of phase voltage, and constructs three-phase reference voltage
Step S4：It is integrated after the line phase inversion voltage of step S2 is carried out product with the three-phase reference voltage that step S3 is constructed,
Obtain the amplitude U' of AC powera, U'b, U'c：
Step S5：It is reconstructed by matrix inverse transformation and obtains three-phase input phase voltage amplitude Ua, Ub, Uc：
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| CN108982954B (en) * | 2018-06-28 | 2020-09-25 | 国网智能科技股份有限公司 | Method and system for calculating phase voltage amplitude and phase suitable for feeder line terminal |
| CN109633239A (en) * | 2018-12-26 | 2019-04-16 | 厦门科华恒盛股份有限公司 | A kind of phase-voltage measurement method and system of three-phase three wire system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117667A (en) * | 2012-12-26 | 2013-05-22 | 深圳创动科技有限公司 | Three-phase three-wire system inverter and wire phase voltage conversion method thereof |
| CN104007321A (en) * | 2014-06-17 | 2014-08-27 | 华北电力大学（保定） | Method for online identification of parameters of reactive compensation capacitor bank |
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| US7720623B2 (en) * | 2007-10-23 | 2010-05-18 | Instituto Potosino De Investigacion Cientifica Y Tecnologica (Ipicyt) | Fixed reference frame phase-locked loop (FRF-PLL) for unbalanced line voltage conditions |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117667A (en) * | 2012-12-26 | 2013-05-22 | 深圳创动科技有限公司 | Three-phase three-wire system inverter and wire phase voltage conversion method thereof |
| CN104007321A (en) * | 2014-06-17 | 2014-08-27 | 华北电力大学（保定） | Method for online identification of parameters of reactive compensation capacitor bank |
Non-Patent Citations (1)
| Title |
|---|
| 适于三相三线光伏并网逆变器的;张永明等;《电气工程学报》;20150731;第10卷(第7期);第26-32页 * |
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