CN109633239A - A kind of phase-voltage measurement method and system of three-phase three wire system - Google Patents
A kind of phase-voltage measurement method and system of three-phase three wire system Download PDFInfo
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- CN109633239A CN109633239A CN201811603227.XA CN201811603227A CN109633239A CN 109633239 A CN109633239 A CN 109633239A CN 201811603227 A CN201811603227 A CN 201811603227A CN 109633239 A CN109633239 A CN 109633239A
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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
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16528—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values using digital techniques or performing arithmetic operations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
Abstract
The invention discloses a kind of phase-voltage measurement method and system of three-phase three wire system, comprising: obtains the phase information of alternating current phase voltage, and constructs the phase locked three-phase synchronous voltage with alternating current phase voltage；The product of be often synchronised voltage and ac line voltage is subjected to cycle integrated respectively, obtains the corresponding relationship between cycle integrated result and cycle integrated result and the amplitude of alternating current phase voltage；According to the amplitude of cycle integrated result and corresponding relationship reconstruct alternating current phase voltage, to restore alternating current phase voltage.It can be seen that, the application can construct the phase locked three-phase synchronous voltage with alternating current phase voltage, and the product of be often synchronised voltage and ac line voltage is subjected to cycle integrated respectively, to isolate the amplitude of alternating current phase voltage, to realize the amplitude of reconstruct alternating current phase voltage, alternating current phase voltage is accurately restored, so photovoltaic inversion equipment can accurately carry out exchange electroresponse according to alternating current phase voltage, to improve its reliability.
Description
Technical field
The present invention relates to phase-voltage measurement fields, a kind of phase-voltage measurement method more particularly to three-phase three wire system and
System.
Background technique
Currently, photovoltaic power generation grid-connected inverter technical standard order: photovoltaic inversion equipment is single-phase or two in alternating current voltage
Corresponding protection act should be made when mutually changing.As it can be seen that the premise that photovoltaic inversion equipment makes protection act is to collect friendship
Galvanic electricity phase voltage.But for some three-phase three wire systems, equipment voltage acquisition can only collect ac line voltage.It is handing over
When galvanic electricity phase voltage changes in balance, photovoltaic inversion equipment accurate can carry out exchange electroresponse according to ac line voltage；But it is handing over
When galvanic electricity phase voltage imbalance changes, photovoltaic inversion equipment accurate can not carry out exchange electroresponse according to ac line voltage, into
And reduce the reliability of photovoltaic inversion equipment.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
Summary of the invention
The object of the present invention is to provide a kind of phase-voltage measurement method and system of three-phase three wire system, realize reconstruct and hand over
The amplitude of galvanic electricity phase voltage, alternating current phase voltage are accurately restored, so photovoltaic inversion equipment can be according to alternating current phase voltage
Exchange electroresponse accurately is carried out, to improve the reliability of photovoltaic inversion equipment.
In order to solve the above technical problems, the present invention provides a kind of phase-voltage measurement methods of three-phase three wire system, comprising:
The phase information of alternating current phase voltage is obtained, and is constructed identical as phase locked the three of the alternating current phase voltage
Walk voltage；
The product of be often synchronised voltage and ac line voltage is subjected to cycle integrated respectively, obtain cycle integrated result and
Corresponding relationship between the cycle integrated result and the amplitude of the alternating current phase voltage；
The amplitude of the alternating current phase voltage is reconstructed according to the periodic line voltage integrating meter result and the corresponding relationship, with
Restore the alternating current phase voltage.
Preferably, the phase information for obtaining alternating current phase voltage, and construct the phase with the alternating current phase voltage
The process of synchronous three-phase synchronous voltage includes:
The phase information of ac line voltage is obtained using default phase locked algorithm, and according to alternating current phase voltage and the friendship
The phase relation of galvanic electricity line voltage obtains the phase information of the alternating current phase voltage；
The phase locked three-phase synchronous voltage of construction and the alternating current phase voltage Wherein,It is synchronised voltage for A,For B be synchronised voltage,For C
Be synchronised voltage.
Preferably, the default phase locked algorithm is specially SOGI phase locked algorithm.
Preferably, described that the product of be often synchronised voltage and ac line voltage is subjected to cycle integrated respectively, obtain week
The process of corresponding relationship between phase integral result and the cycle integrated result and the amplitude of the alternating current phase voltage includes:
Utilize predetermined period integral relation
The product of be often synchronised voltage and ac line voltage is subjected to cycle integrated respectively, to obtain A phases line voltage product
Divide resultB phases line voltage integral resultC phases line voltage integral resultAnd the corresponding relationship between three-phase line voltage integral result and the amplitude of the alternating current phase voltageWherein, T0For period, UaFor alternating current A phase voltage amplitude, UbFor alternating current B phase voltage width
Value, UcFor alternating current C phase voltage amplitude；
The then amplitude that the alternating current phase voltage is reconstructed according to the cycle integrated result and the corresponding relationship
Process includes:
The amplitude of the alternating current phase voltage is reconstructed using inverse of a matrix transformation
Preferably, the phase-voltage measurement method further include:
The each corresponding phase shortage amplitude thresholds of the alternating current phase voltage are preset respectively；
It is a certain when reconstruct compared with the amplitude of the alternating current phase voltage of reconstruct and the phase shortage amplitude thresholds are corresponded
When the amplitude of the alternating current voltage of phase is less than its corresponding phase shortage amplitude thresholds, determine that this is mutually disconnected.
Preferably, the phase-voltage measurement method further include:
The each corresponding standard amplitude range of the alternating current phase voltage is preset respectively；
It is a certain when reconstruct compared with the amplitude of the alternating current phase voltage of reconstruct and the standard amplitude range are corresponded
When the amplitude of the alternating current voltage of phase is less than the lower limit of its corresponding standard amplitude range, the phase alternating current under-voltage is determined；
When the amplitude of a certain phase voltage of reconstruct is greater than the upper limit of its corresponding standard amplitude range, the phase alternating current voltage mistake is determined
Pressure.
Preferably, the phase-voltage measurement method further include:
When determining that phase shortage or under-voltage or over-voltage occur in single-phase alternating current voltage or two-phase or three-phase, control warning device hair
Alarm is corresponded to out.
Preferably, the warning device is specially display screen.
Preferably, the phase-voltage measurement method further include:
When determining that phase shortage or under-voltage or over-voltage occur in single-phase alternating current voltage or two-phase or three-phase, superior controlling equipment
Send corresponding fault message.
In order to solve the above technical problems, the present invention also provides a kind of phase-voltage measurement system of three-phase three wire system, packet
It includes:
Constructing module for obtaining the phase information of alternating current phase voltage, and constructs the phase with the alternating current phase voltage
The three-phase synchronous voltage of bit synchronization；
Integration module is obtained for the product of be often synchronised voltage and ac line voltage to be carried out cycle integrated respectively
Corresponding relationship between cycle integrated result and the cycle integrated result and the amplitude of the alternating current phase voltage；
Reconstructed module, for reconstructing the alternating current phase voltage according to the cycle integrated result and the corresponding relationship
Amplitude, to restore the alternating current phase voltage.
The present invention provides a kind of phase-voltage measurement methods of three-phase three wire system, comprising: obtains alternating current phase voltage
Phase information, and construct the phase locked three-phase synchronous voltage with alternating current phase voltage；To often be synchronised voltage and friendship respectively
The product of galvanic electricity line voltage carries out cycle integrated, obtains the width of cycle integrated result and cycle integrated result and alternating current phase voltage
Corresponding relationship between value；According to the amplitude of cycle integrated result and corresponding relationship reconstruct alternating current phase voltage, to restore to exchange
Electric phase voltage.
As it can be seen that the application can construct the phase locked three-phase synchronous voltage with alternating current phase voltage, and respectively will
The product of voltage and ac line voltage of being often synchronised carries out cycle integrated, to isolate the amplitude of alternating current phase voltage, thus
Realize the amplitude of reconstruct alternating current phase voltage, alternating current phase voltage is accurately restored, so photovoltaic inversion equipment can be according to friendship
Galvanic electricity phase voltage accurately carries out exchange electroresponse, to improve the reliability of photovoltaic inversion equipment.
The present invention also provides a kind of phase-voltage measurement systems of three-phase three wire system, have with above-mentioned detection method identical
Beneficial effect.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of flow chart of the phase-voltage measurement method of three-phase three wire system provided in an embodiment of the present invention；
Fig. 2 is a kind of schematic diagram of the phase-voltage measurement method of three-phase three wire system provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of the phase-voltage measurement system of three-phase three wire system provided in an embodiment of the present invention.
Specific embodiment
Core of the invention is to provide a kind of phase-voltage measurement method and system of three-phase three wire system, realizes reconstruct and hands over
The amplitude of galvanic electricity phase voltage, alternating current phase voltage are accurately restored, so photovoltaic inversion equipment can be according to alternating current phase voltage
Exchange electroresponse accurately is carried out, to improve the reliability of photovoltaic inversion equipment.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of stream of the phase-voltage measurement method of three-phase three wire system provided in an embodiment of the present invention
Cheng Tu.
The phase-voltage measurement method of the three-phase three wire system includes:
Step S1: the phase information of alternating current phase voltage, and construction and phase locked the three of alternating current phase voltage are obtained
Be synchronised voltage.
Step S2: carrying out cycle integrated for the product of be often synchronised voltage and ac line voltage respectively, obtains period product
Divide the corresponding relationship between result and cycle integrated result and the amplitude of alternating current phase voltage.
Step S3: according to the amplitude of cycle integrated result and corresponding relationship reconstruct alternating current phase voltage, to restore alternating current
Phase voltage.
Specifically, the alternating current phase-voltage measurement principle of the application includes construction three-phase synchronous voltage, separation alternating current phase
The amplitude of voltage and the several steps of amplitude for reconstructing alternating current phase voltage, below analyze the principle of each step:
Step S1 is to construct three-phase synchronous voltage: three-phase synchronous voltage refers to the Phase synchronization with alternating current phase voltage
Three-phase voltage, so the phase information of alternating current phase voltage should be obtained first, to calculate synchronous three-phase synchronous electricity
Pressure, so that the amplitude for later separation alternating current phase voltage is prepared.
Step S2 is the amplitude for separating alternating current phase voltage: if be often synchronised voltage and the friendship that respectively construct step S1
The product of galvanic electricity line voltage carries out cycle integrated, then (amplitude separation is embodied in week for the amplitude separation of achievable alternating current phase voltage
Phase integral result is corresponding be alternating current phase voltage amplitude syntagmatic formula).So ac line voltage should be detected first,
Then the product of the ac line voltage of step S1 be often synchronised voltage and the detection constructed is subjected to cycle integrated, a side respectively
Cycle integrated can be obtained as a result, on the other hand can be obtained corresponding between cycle integrated result and the amplitude of alternating current phase voltage in face
Relationship (referred to as integral amplitude corresponding relationship), to isolate the amplitude of alternating current phase voltage, to be later reconstitution alternating current phase
The amplitude of voltage is prepared.
Step S3 is the amplitude for reconstructing alternating current phase voltage: step S2 known periods integral result and integral amplitude are corresponding
Relationship, so the amplitude of alternating current phase voltage can be reconstructed according to cycle integrated result and integral amplitude corresponding relationship.Cause
This can recover alternating current phase voltage on the basis of the amplitude and its phase information of known alternating current phase voltage.
The present invention provides a kind of phase-voltage measurement methods of three-phase three wire system, comprising: obtains alternating current phase voltage
Phase information, and construct the phase locked three-phase synchronous voltage with alternating current phase voltage；To often be synchronised voltage and friendship respectively
The product of galvanic electricity line voltage carries out cycle integrated, obtains the width of cycle integrated result and cycle integrated result and alternating current phase voltage
Corresponding relationship between value；According to the amplitude of cycle integrated result and corresponding relationship reconstruct alternating current phase voltage, to restore to exchange
Electric phase voltage.
As it can be seen that the application can construct the phase locked three-phase synchronous voltage with alternating current phase voltage, and respectively will
The product of voltage and ac line voltage of being often synchronised carries out cycle integrated, to isolate the amplitude of alternating current phase voltage, thus
Realize the amplitude of reconstruct alternating current phase voltage, alternating current phase voltage is accurately restored, so photovoltaic inversion equipment can be according to friendship
Galvanic electricity phase voltage accurately carries out exchange electroresponse, to improve the reliability of photovoltaic inversion equipment.
Referring to figure 2., Fig. 2 is a kind of original of the phase-voltage measurement method of three-phase three wire system provided in an embodiment of the present invention
Reason figure.The phase-voltage measurement method is on the basis of the above embodiments:
As a kind of optionally embodiment, the phase information of alternating current phase voltage is obtained, and is constructed and alternating current phase voltage
The process of phase locked three-phase synchronous voltage include:
The phase information of ac line voltage is obtained using default phase locked algorithm, and according to alternating current phase voltage and alternating current
The phase relation of line voltage obtains the phase information of alternating current phase voltage；
The phase locked three-phase synchronous voltage of construction and alternating current phase voltage Wherein,It is synchronised voltage for A,For B be synchronised voltage,For C phase
Synchronizing voltage.
It should be noted that the default of the application sets in advance, it is only necessary to which setting is primary, unless according to practical feelings
Condition needs to modify, and does not otherwise need to reset.
Specifically, it was known that the phase of extraneous signal can be traced in phase locked algorithm, so phase locked algorithm is arranged in the application in advance, so
Locking phase is carried out to ac line voltage using phase locked algorithm afterwards, it is (specific to obtain with the phase information for getting ac line voltage
To the phase and angular frequency of ac line voltage positive sequence).Due on the phase of ac line voltage positive sequence and the basis of angular frequency
On, then phase and angular frequency that π/6 are alternating current phase voltage positive sequence are subtracted, so in the phase for getting ac line voltage
After information, believed according to the phase that alternating current phase voltage and the phase relation of ac line voltage can obtain alternating current phase voltage
Breath, to construct the phase locked three-phase synchronous voltage with alternating current phase voltage
As one kind, optionally embodiment, default phase locked algorithm are specially SOGI phase locked algorithm.
Further, what the accuracy detected for the phase-voltage measurement method of the application was affected is phase-locked loop,
So the phase locked algorithm of the application selects accurate SOGI phase locked algorithm, to guarantee the accuracy of detection.
As a kind of optionally embodiment, the product of be often synchronised voltage and ac line voltage is subjected to period product respectively
Point, obtain the process packet of the corresponding relationship between cycle integrated result and cycle integrated result and the amplitude of alternating current phase voltage
It includes:
Utilize predetermined period integral relation
The product of be often synchronised voltage and ac line voltage is subjected to cycle integrated respectively, to obtain A phases line voltage product
Divide resultB phases line voltage integral resultC phases line voltage integral resultAnd the corresponding relationship between three-phase line voltage integral result and the amplitude of alternating current phase voltageWherein, T0For period, UaFor alternating current A phase voltage amplitude, UbFor alternating current B phase voltage width
Value, UcFor alternating current C phase voltage amplitude；
Then include: according to the process of cycle integrated result and the amplitude of corresponding relationship reconstruct alternating current phase voltage
The amplitude of reconstruct alternating current phase voltage is converted using inverse of a matrix
Specifically, carrying out cycle integrated using the product of be often synchronised voltage and the ac line voltage of locking phase construction can be with
The amplitude separation for realizing alternating current phase voltage, mainly calculating is to utilize cycle integrated relational expressionCome what is completed, then this formula calculates, can obtain
Therefore, it can be realized based on cycle integrated relational expression: be often synchronised voltage and the alternating current for respectively constructing locking phase
Every phase amplitude that the product of line voltage carries out alternating current phase voltage, which separates, to be calculated, it may be assumed that
ubc=ub-uc, uca=uc-ua, uaFor alternating current A phase voltage, ubFor alternating current B phase voltage, ucFor alternating current C phase electricity
Pressure, Ua、Ub、UcFor alternating current phase voltage amplitude.
As it can be seen that A phases line voltage integral result isB phases line voltage integral result isC phases line voltage integral result isSo three-phase line voltage integral result with exchange
Corresponding relationship between the amplitude of electric phase voltage may be expressed as:
According to the corresponding relationship between three-phase line voltage integral result and the amplitude of alternating current phase voltage, inverse of a matrix is utilized
Transformation is the amplitude of restructural alternating current phase voltage, it may be assumed that
As a kind of optionally embodiment, the phase-voltage measurement method further include:
The each corresponding phase shortage amplitude thresholds of alternating current phase voltage are preset respectively；
Compared with the amplitude of the alternating current phase voltage of reconstruct and phase shortage amplitude thresholds are corresponded, when a certain phase of reconstruct
When the amplitude of alternating current voltage is less than its corresponding phase shortage amplitude thresholds, determine that this is mutually disconnected.
Further, it is contemplated that when any phase of alternating current disconnects, which is a half voltage, and in addition two-phase is normal electricity
Pressure (disconnected phase voltage situation of change), so the application is on the basis of the accurately amplitude of the detection every phase voltage of alternating current, it is acceptable real
The open phase detection of existing alternating current.
Specifically, the application is based on disconnected phase voltage situation of change, and rationally setting alternating current phase voltage is each corresponding in advance
Phase shortage amplitude thresholds, and think: when the amplitude of the alternating current voltage of a certain phase of reconstruct is less than its corresponding phase shortage amplitude threshold
When value, illustrate that this is mutually disconnected；When the amplitude of the alternating current voltage of a certain phase of reconstruct is not less than its corresponding phase shortage amplitude thresholds
When, illustrate that the phase does not disconnect.
Based on this, compared with the application corresponds the amplitude of the alternating current phase voltage of reconstruct with phase shortage amplitude thresholds, when
When the amplitude of the alternating current voltage of a certain phase of reconstruct is less than its corresponding phase shortage amplitude thresholds, determine that this is mutually disconnected, thus real
The open phase detection of existing alternating current.
As a kind of optionally embodiment, the phase-voltage measurement method further include:
The each corresponding standard amplitude range of alternating current phase voltage is preset respectively；
Compared with the amplitude of the alternating current phase voltage of reconstruct and standard amplitude range are corresponded, when a certain phase of reconstruct
When the amplitude of alternating current voltage is less than the lower limit of its corresponding standard amplitude range, the phase alternating current under-voltage is determined；When weight
When the amplitude of a certain phase voltage of structure is greater than the upper limit of its corresponding standard amplitude range, the phase alternating current electric voltage over press is determined.
Further, the application can also carry out the detection of phase voltage overvoltage/undervoltage to alternating current.Specifically, the application closes in advance
The reason setting each corresponding standard amplitude range of alternating current phase voltage, and think: when the alternating current voltage of a certain phase of reconstruct
Amplitude be less than its corresponding standard amplitude range lower limit when, illustrate the phase alternating current under-voltage；When a certain phase of reconstruct
Alternating current voltage amplitude be greater than its corresponding standard amplitude range the upper limit when, illustrate the phase alternating current electric voltage over press；When
When the amplitude of the alternating current voltage of a certain phase of reconstruct is within its corresponding standard amplitude range, illustrate the phase alternating current voltage
It complies with standard.
Based on this, compared with the application corresponds the amplitude of the alternating current phase voltage of reconstruct with standard amplitude range, when
When the amplitude of the alternating current voltage of a certain phase of reconstruct is less than the lower limit of its corresponding standard amplitude range, the phase alternating current is determined
Under-voltage；When the amplitude of a certain phase voltage of reconstruct is greater than the upper limit of its corresponding standard amplitude range, the intersection is determined
Galvanic electricity electric voltage over press, to realize the phase voltage overvoltage/undervoltage detection of alternating current.
It is understood that for any phase alternating current voltage, the lower limit > phase shortage amplitude thresholds of standard amplitude range.
As a kind of optionally embodiment, the phase-voltage measurement method further include:
When determining that phase shortage or under-voltage or over-voltage occur in single-phase alternating current voltage or two-phase or three-phase, control warning device hair
Alarm is corresponded to out.
Further, the application can also determine alternating current voltage single-phase (or two-phase or three-phase) occur phase shortage (or owe
Pressure or over-voltage) when, control warning device issues corresponding alarm so that staff learn in time it is specific existing for alternating current therefore
Barrier.
For example, corresponding first alarm of single-phase open-phase fault, corresponding second alarm of single-phase under-voltage fault, individual phase over voltage failure pair
Answer third alarm；Two-phase open-phase fault corresponds to the 4th alarm, corresponding 5th alarm of two-phase under-voltage fault, and two-phase over-voltage fault corresponds to
6th alarm；Three-phase lack phase failure corresponds to the 7th alarm, corresponding 8th alarm of three-phase under-voltage fault, three-phase overvoltage failure corresponding the
Nine alarms.Here the first alarm to the 9th alarm is respectively different alarm, to distinguish different faults existing for alternating current.
As one kind, optionally embodiment, warning device are specially display screen.
Specifically, the warning device of the application can select display screen, for alternating current voltage is single-phase or two-phase or three
Mutually occur showing corresponding warning message when phase shortage or under-voltage or over-voltage.Refer to alternatively, the warning device of the application can be selected also
Show other devices with warning function such as lamp, the application is not particularly limited herein.
As a kind of optionally embodiment, the phase-voltage measurement method further include:
When determining that phase shortage or under-voltage or over-voltage occur in single-phase alternating current voltage or two-phase or three-phase, superior controlling equipment
Send corresponding fault message.
Further, the application can also determine single-phase alternating current voltage or two-phase or three-phase occur phase shortage or it is under-voltage or
When over-voltage, superior controlling equipment sends corresponding fault message, so that upper management personnel be made to be understood existing for alternating current in time
Specific failure.
Referring to figure 3., Fig. 3 is a kind of knot of the phase-voltage measurement system of three-phase three wire system provided in an embodiment of the present invention
Structure schematic diagram.
The present invention also provides a kind of phase-voltage measurement systems of three-phase three wire system, comprising:
Constructing module 1 for obtaining the phase information of alternating current phase voltage, and constructs same with the phase of alternating current phase voltage
The three-phase synchronous voltage of step；
Integration module 2 is obtained for the product of be often synchronised voltage and ac line voltage to be carried out cycle integrated respectively
Corresponding relationship between cycle integrated result and cycle integrated result and the amplitude of alternating current phase voltage；
Reconstructed module 3, for the amplitude according to cycle integrated result and corresponding relationship reconstruct alternating current phase voltage, to restore
Alternating current phase voltage.
The introduction of phase-voltage measurement system provided by the present application please refers to the embodiment of above-mentioned phase-voltage measurement method, this Shen
It please details are not described herein.
It should also be noted that, in the present specification, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of phase-voltage measurement method of three-phase three wire system characterized by comprising
The phase information of alternating current phase voltage is obtained, and is constructed and the phase locked three-phase synchronous of alternating current phase voltage electricity
Pressure；
The product of be often synchronised voltage and ac line voltage is subjected to cycle integrated respectively, obtains cycle integrated result and described
Corresponding relationship between cycle integrated result and the amplitude of the alternating current phase voltage；
The amplitude of the alternating current phase voltage is reconstructed, according to the cycle integrated result and the corresponding relationship to restore the friendship
Galvanic electricity phase voltage.
2. the phase-voltage measurement method of three-phase three wire system as described in claim 1, which is characterized in that the acquisition alternating current
The phase information of phase voltage, and construct and include: with the process of the phase locked three-phase synchronous voltage of the alternating current phase voltage
The phase information of ac line voltage is obtained using default phase locked algorithm, and according to alternating current phase voltage and the alternating current
The phase relation of line voltage obtains the phase information of the alternating current phase voltage；
The phase locked three-phase synchronous voltage of construction and the alternating current phase voltage
Wherein,It is synchronised voltage for A,For B be synchronised voltage,
It is synchronised voltage for C.
3. the phase-voltage measurement method of three-phase three wire system as claimed in claim 2, which is characterized in that the default locking phase is calculated
Method is specially SOGI phase locked algorithm.
4. the phase-voltage measurement method of three-phase three wire system as claimed in claim 2, which is characterized in that described respectively by every phase
The product of synchronizing voltage and ac line voltage carries out cycle integrated, obtain cycle integrated result and the cycle integrated result with
The process of corresponding relationship between the amplitude of the alternating current phase voltage includes:
Utilize predetermined period integral relation
The product of be often synchronised voltage and ac line voltage is subjected to cycle integrated respectively, to obtain A phases line voltage integral knot
FruitB phases line voltage integral resultC phases line voltage integral resultAnd the corresponding relationship between three-phase line voltage integral result and the amplitude of the alternating current phase voltageWherein, T0For period, UaFor alternating current A phase voltage amplitude, UbFor alternating current B phase voltage width
Value, UcFor alternating current C phase voltage amplitude；
The then process of the amplitude that the alternating current phase voltage is reconstructed according to the cycle integrated result and the corresponding relationship
Include:
The amplitude of the alternating current phase voltage is reconstructed using inverse of a matrix transformation
5. the phase-voltage measurement method of three-phase three wire system as claimed in claim 4, which is characterized in that the phase-voltage measurement side
Method further include:
The each corresponding phase shortage amplitude thresholds of the alternating current phase voltage are preset respectively；
Compared with the amplitude of the alternating current phase voltage of reconstruct and the phase shortage amplitude thresholds are corresponded, when a certain phase of reconstruct
When the amplitude of alternating current voltage is less than its corresponding phase shortage amplitude thresholds, determine that this is mutually disconnected.
6. the phase-voltage measurement method of three-phase three wire system as claimed in claim 5, which is characterized in that the phase-voltage measurement side
Method further include:
The each corresponding standard amplitude range of the alternating current phase voltage is preset respectively；
Compared with the amplitude of the alternating current phase voltage of reconstruct and the standard amplitude range are corresponded, when a certain phase of reconstruct
When the amplitude of alternating current voltage is less than the lower limit of its corresponding standard amplitude range, the phase alternating current under-voltage is determined；When weight
When the amplitude of a certain phase voltage of structure is greater than the upper limit of its corresponding standard amplitude range, the phase alternating current electric voltage over press is determined.
7. the phase-voltage measurement method of three-phase three wire system as claimed in claim 6, which is characterized in that the phase-voltage measurement side
Method further include:
When determining that phase shortage or under-voltage or over-voltage occur in single-phase alternating current voltage or two-phase or three-phase, control warning device sending pair
Answer alarm.
8. the phase-voltage measurement method of three-phase three wire system as claimed in claim 7, which is characterized in that the warning device tool
Body is display screen.
9. the phase-voltage measurement method of three-phase three wire system as claimed in claim 7, which is characterized in that the phase-voltage measurement side
Method further include:
When determining that phase shortage or under-voltage or over-voltage occur in single-phase alternating current voltage or two-phase or three-phase, superior controlling equipment is sent
Corresponding fault message.
10. a kind of phase-voltage measurement system of three-phase three wire system characterized by comprising
Constructing module for obtaining the phase information of alternating current phase voltage, and constructs same with the phase of the alternating current phase voltage
The three-phase synchronous voltage of step；
Integration module obtains the period for the product of be often synchronised voltage and ac line voltage to be carried out cycle integrated respectively
Corresponding relationship between integral result and the cycle integrated result and the amplitude of the alternating current phase voltage；
Reconstructed module, for reconstructing the width of the alternating current phase voltage according to the cycle integrated result and the corresponding relationship
Value, to restore the alternating current phase voltage.
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| Publication number | Priority date | Publication date | Assignee | Title |
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