CN107422221A - On-line testing three-phase APF and primary current mutual inductor interstar connection a kind of method - Google Patents
On-line testing three-phase APF and primary current mutual inductor interstar connection a kind of method Download PDFInfo
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- CN107422221A CN107422221A CN201710786884.1A CN201710786884A CN107422221A CN 107422221 A CN107422221 A CN 107422221A CN 201710786884 A CN201710786884 A CN 201710786884A CN 107422221 A CN107422221 A CN 107422221A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
- G01R31/67—Testing the correctness of wire connections in electric apparatus or circuits
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Abstract
This application discloses a kind of on-line testing three-phase APF and primary current mutual inductor interstar connection method, including：Phase output bridge arm shut-off in the three-phase output bridge arm that three-phase APF is connected with power network, two-phase output bridge arm is respectively to the current signal I of power network injection predeterminated frequency in addition21With current signal I22；The power network low current signal of primary current transformer output is obtained, extraction power network low current signal intermediate frequency rate is the current signal I of predeterminated frequency1Each phase amplitude and phase；Utilize the current signal I of the current transformer detection three-phase output bridge arm injection power network set in three-phase APF2, extraction current signal I2Each phase amplitude and phase；Judge current signal I1With current signal I2Current signal parameter it is whether consistent；If current signal I1With current signal I2Current signal parameter it is consistent, then judge three-phase APF and primary current mutual inductor interstar connection it is correct.Method of calibration disclosed in the present application, verify efficiency high；Need not be safe by grid cut-off.
Description
Technical field
The application is related to electric device maintenance field, more particularly to a kind of on-line testing three-phase APF and primary current mutual inductance
The method of device wiring.
Background technology
Three-phase APF (Active Power Filter, Active Power Filter-APF) is a kind of for eliminating harmonic wave electricity in power network
The converters of stream.Three-phase APF operation principle is：The first winding of primary current transformer is connected with power network to be examined
Power network current is surveyed, power network current is converted to by the no-load voltage ratio of primary current transformer defeated in secondary winding after power network low current signal
Go out, three-phase APF is connected by separate secondary winding corresponding with primary current transformer, power network low current signal is obtained, from electricity
Harmonic current is extracted in net low current signal, and then the three-phase by being set in three-phase APF exports bridge arm and injected to power network bus
With the electric current of harmonic current opposite in phase to reach the purpose of compensation harmonic electric current.Therefore, three-phase APF and primary current transformer
Correct connection, it is the important prerequisite of three-phase APF energy normal works, just whether verification three-phase APF and primary current mutual inductor interstar connection
Really, can be realized by detecting three-phase APF working conditions.
When power network bus is powered, three-phase APF is in running order, and whether detection three-phase APF working conditions can normally lead to
Cross whether detection power network low current signal normally judges.If power network low current abnormal signal is detected, it is necessary to will be once electric
When current transformer reconnects with three-phase APF, it is impossible to directly disconnect the connection of primary current transformer and three-phase APF, otherwise can
Cause primary current transformer open fault, it is necessary to first power off power network bus.And when power network bus powers off, by three-phase APF
After being reconnected with primary current transformer, because three-phase APF is not in working condition, therefore can not be by detecting the small electricity of power network
Stream signal judge three-phase APF whether can normal work, can only wait power network bus energization after three-phase APF working conditions are entered again
Row detection.During verification three-phase APF with primary current mutual inductor interstar connection, it may be necessary to carry out repeatedly waiting power network bus to break
Electricity, the process being powered.
However, power network bus repeatedly powers off, user other electrical equipments that can be loaded to power network that are powered impact, no
Beneficial to electrical power stabilization, also, the power-off of power network bus, energization is repeatedly waited to also result in the less efficient of verification wiring.
The content of the invention
This application provides a kind of on-line testing three-phase APF and primary current mutual inductor interstar connection method, to solve to verify
The problem of wiring efficiency is low.
This application provides a kind of on-line testing three-phase APF and primary current mutual inductor interstar connection method, this method includes：
The three-phase that three-phase APF is connected with power network exports the phase output bridge arm shut-off in bridge arm, in addition two-phase output bridge
Arm injects the current signal I of predeterminated frequency to the power network respectively21With current signal I22, wherein, the current signal I21And electricity
Flow signal I22Amplitude is identical, opposite in phase, the predeterminated frequency is more than the integral multiple of network operation frequency or less than power network work
The integral multiple of working frequency；
The power network low current signal of primary current transformer output is obtained, extracting the power network low current signal intermediate frequency rate is
The current signal I of the predeterminated frequency1Each phase amplitude and phase；
The electric current that the three-phase output bridge arm injection power network is detected using the current transformer set in the three-phase APF is believed
Number I2, extract the current signal I2Each phase amplitude and phase；
Judge the current signal I1With the current signal I2Current signal parameter it is whether consistent, wherein, the electric current
Signal parameter includes the amplitude and phase for separate, the corresponding separate upper electric current that electric current be present；
If the current signal I1With the current signal I2Current signal parameter it is consistent, then judge the three-phase APF
The middle current signal I for injecting predeterminated frequency to the power network respectively21With current signal I22Two-phase output bridge arm and primary current
Mutual inductor interstar connection is correct.
Preferably, methods described also includes：
If the current signal I1A phase currents phase and C phase currents phase, the current signal I2C phase currents
Phase is consistent, then judges the A phases of the primary current transformer and the A phase connection reverse polarity connections of the three-phase APF.
Preferably, methods described also includes：
If the current signal I1A phase current magnitudes for 0, the phase of B phase currents and the current signal I2A phases
Current phase is identical, then judges that the A phases of the primary current transformer, B phases the separate of phase connection corresponding with the three-phase APF connect
Instead.
Preferably, methods described also includes：
If the current signal I1Wherein biphase current respectively with the current signal I2Corresponding biphase current phase phase
Same, amplitude difference, then judge the no-load voltage ratio parameter setting mistake of the primary current transformer.
Preferably, the current signal I that the power network low current signal intermediate frequency rate is the predeterminated frequency is extracted1Each phase amplitude
And phase, including：
The power network low current signal is sampled；
Discrete Fourier transform is carried out to the signal after sampling, frequency is extracted from the signal after discrete Fourier transform is
The current signal I of the predeterminated frequency1Each phase amplitude and phase.
Preferably, the predeterminated frequency includes 75Hz-175Hz.
Preferably, the three-phase APF includes Three-Phase Shunt Active Power electric-power filter.
On-line testing three-phase APF and the beneficial effect of the method for primary current mutual inductor interstar connection include：
The method of on-line testing three-phase APF and primary current mutual inductor interstar connection that the application provides, by by three-phase APF with
The connected three-phase output bridge arm wherein phase bridge arm shut-off of power network, two-phase output bridge arm is respectively pre- to power network injected frequency in addition
If frequency, amplitude are identical, the current signal of opposite in phase, frequency is extracted from power network low current signal using primary current transformer
Rate is the current signal I of predeterminated frequency1, utilize the current signal of the current transformer detection injection power network set in three-phase APF
I2, according to current signal I1With current signal I2The amplitude that separate, the corresponding separate upper electric current of electric current be present is consistent next with phase
Judge that three-phase APF and primary current mutual inductor interstar connection are correct, because the current signal of injection is different from power network power frequency component frequency,
Therefore it can not be powered off in power network bus, three-phase APF and primary current mutual inductance are verified under conditions of primary current transformer does not power off
Device wiring, the efficiency of verification wiring is improved, be advantageous to power system stability operation；The shut-off of bridge arm is exported by adjusting three-phase
With connection, three-phase APF and the phase connection of primary current transformer three verification can be continuously finished, in continuous checking procedure, adjustment three
Mutually the shut-off of output bridge arm is with connecting without having a power failure, and need not change three-phase APF and primary current the transformer order of connection, enters
The efficiency for improving verification wiring of one step；Inject the two-phase predeterminated frequency current signal I of power network21With current signal I22Amplitude
Identical and opposite in phase, according to circuit theory, if wiring is correct, should exist in power network predeterminated frequency amplitude is identical and phase
The opposite biphase current in position, the electric current of the predeterminated frequency is not present in another phase, avoids and is preset simultaneously to power network application three-phase
It is that may be present during frequency current signal to be difficult to differentiate with the presence or absence of wrong is separate, no-load voltage ratio sets mistake and because wiring is insecure
Cause the situation of signal attenuation；Predeterminated frequency current signal is extracted using the current transformer and controller set in three-phase APF,
Extra wiring calibration equipment and signal filtering algorithm need not be utilized.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the application, letter will be made to the required accompanying drawing used in embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without having to pay creative labor,
Other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is that a kind of on-line testing three-phase APF that the application provides and the structure of primary current mutual inductor interstar connection system are shown
It is intended to；
Fig. 2 is a kind of on-line testing three-phase APF and the flow of the method for primary current mutual inductor interstar connection that the application provides
Schematic diagram；
Fig. 3-a are the three-phase APF and the correct current diagram of primary current mutual inductor interstar connection that the application provides；
Fig. 3-b are the three-phase APF of the application offer electricity reversed with primary current transformer A phase secondary winding wiring polarities
Flow diagram；
Fig. 3-c are the three-phase APF of the application offer electricity reversed with primary current transformer C phase secondary winding wiring polarities
Flow diagram；
Fig. 3-d are that the three-phase APF that the application provides illustrates with the electric current of primary current transformer A phases and C phase connection wrongs
Figure；
Fig. 3-e are that the three-phase APF that the application provides illustrates with the reversed electric current of primary current transformer A phases and B phase connections
Figure；
Fig. 3-f are that the three-phase APF that the application provides illustrates with the reversed electric current of primary current transformer C phases and B phase connections
Figure；
Fig. 3-g are a kind of current diagram that the primary current mutual inductor ratio that the application provides sets mistake；
Fig. 3-h are another current diagram that the primary current mutual inductor ratio that the application provides sets mistake；
Symbol is expressed as：
10- power network buses, 20- three-phases APF, 21- controller, 22- output circuits, 23- current transformers, 24- output bridges
Arm, 30- primary current transformers, 40- loads, 50- external switches.
Embodiment
Referring to Fig. 1, for a kind of on-line testing three-phase APF that the application provides and the knot of primary current mutual inductor interstar connection system
Structure schematic diagram.As shown in figure 1, on-line testing system includes：Power network bus 10, three-phase APF20, primary current transformer 30 and negative
Carry 40.
Specifically, the power network in the present embodiment is three-phase three-wire system power network.In three-phase three-wire system power network, power network bus 10
Including A phases bus, B phases bus and C phase buses, respectively connection corresponding with power network triple line (A phase lines, B phase lines and C phase lines), electricity
Load 40 is connected with net triple line, load 40 produces harmonic wave in power network.
The first winding of primary current transformer 30 includes A phases first winding, B phases first winding and C phase first windings, point
Corresponding to not being connected in power network triple line, i.e., A phases first winding is connected with A phase lines, and B phases first winding is connected with B phase lines, C
Phase first winding is connected with C phase lines.The secondary winding of primary current transformer 30 includes A phases positive polarity output terminal, A phase negative polarity
Output end, B phases positive polarity output terminal, B phases negative polarity output, C phases positive polarity output terminal and C phase output terminals.Primary current is mutual
6 output ends of sensor 30 and three-phase APF20 6 inputs (A+ inputs, A- inputs, B+ inputs, B- inputs, C
+ input and C- inputs) connection should be corresponded to, but it is actual because many reasons may cause connection error, it is necessary to be connect
Line verifies.
Three-phase APF20 is Three-Phase Shunt Active Power electric-power filter, including controller 21, output circuit 22, Current Mutual Inductance
Device 23 and output bridge arm 24.Controller 21 is connected with output circuit 22, and output circuit is connected with output bridge arm 24, exports bridge arm 24
Including three-phase output bridge arm be that A phases export bridge arm, B phases export bridge arm and export bridge arm with C phases, respectively through an external switch 50 with
The three-phase bus of power network is corresponding to be connected, and external switch 50 includes 3 sub switchs, and being respectively used to control A phases, to export bridge arm, B phases defeated
Go out bridge arm and export turning on and off for bridge arm with C phases.It is defeated that the first winding of current transformer 23 exports bridge arm, B phases with A phases respectively
Go out bridge arm and export bridge arm with C phases to connect, the secondary winding of current transformer 23 is connected with controller 21.
Online school is carried out using the structure of the on-line testing three-phase APF shown in Fig. 1 and primary current mutual inductor interstar connection system
The method tested is referring to Fig. 2, for a kind of on-line testing three-phase APF that the application provides and the method for primary current mutual inductor interstar connection
Schematic flow sheet.As shown in Fig. 2 the on-line testing method that the application provides, specifically includes following steps：
Step S110：Phase output bridge arm shut-off in the three-phase output bridge arm that three-phase APF is connected with power network, in addition two
Mutually output bridge arm injects the current signal I of predeterminated frequency to power network respectively21With current signal I22, wherein, current signal I21And electricity
Flow signal I22Amplitude is identical, opposite in phase, predeterminated frequency is more than the integral multiple of network operation frequency or less than network operation frequency
The integral multiple of rate.
Specifically, turning off B phases using external switch 50 exports bridge arm, connection A phases export bridge arm and export bridge arm with C phases.Profit
The voltage signal that amplitude is identical, 180 ° of phase difference is opposite in phase is produced with controller 21, voltage signal is through output circuit 22
Be converted to current signal I2, current signal I2Including A phase current signals I21(i.e. Ia2), B phase current signals I23(Ib2) electric with C phases
Flow signal I22(Ic2), wherein, Ia2And Ic2Amplitude is identical, opposite in phase, Ib2Amplitude is 0.Current signal Ia2Bridge arm is exported through A phases
It is injected on power network A phase buses, current signal Ia2Bridge arm is exported through C phases to be injected on power network C phase buses.In three-phase three-wire system electricity
Lu Zhong, according to circuit theory, form a specific current loop and flow to opposite electricity, it is necessary to have wherein in two phase lines
Stream.Such as A, C two-phase have electric current, just there is vector correlation Ia2+Ic2=0, therefore, the current signal I of power network is injected in the present embodiment2
Loop can be formed in power network, flows back to three-phase APF20.
Current signal I2Frequency be predeterminated frequency, predeterminated frequency is more than the integral multiple of network operation frequency or less than electricity
The integral multiple of net working frequency, 75Hz, 125Hz or 175Hz can be chosen, these frequencies are not the whole of network operation frequency 50Hz
Several times, Harmonic Detection will not be caused excessively to influence.These frequencies, can be easily by all kinds than relatively low simultaneously
Current transformer detect without obvious signal attenuation.Because the sample frequency of controller 20 is very high, use is discrete
The frequency resolution of fourier transform algorithm can reach 12.5Hz, thus controller 20 can from be mixed with power current and
The current signal I of predeterminated frequency is extracted in the signal of harmonic current2.In the present embodiment, predeterminated frequency chooses 75Hz.
Step S120：The power network low current signal of primary current transformer output is obtained, is extracted in power network low current signal
Frequency is the current signal I of predeterminated frequency1Each phase amplitude and phase.
Specifically, after caused current signal is injected on power network bus in step S110, with power network power current, harmonic wave
Electric current etc. mixes, and is detected by primary current transformer 30, and primary current transformer 30 is according to primary current transformer
No-load voltage ratio, the signal of mixing is converted into power network low current signal, secondary winding export.Three-phase APF20 controller 21 from
The secondary winding of primary current transformer 30 obtains power network low current signal and handled.Processing procedure includes：First, to electricity
Net low current signal is sampled；Second, discrete Fourier transform is carried out to the signal after sampling, after discrete Fourier transform
Signal in extract frequency be predeterminated frequency current signal I1Each phase amplitude and phase, that is, obtain current signal Ia1 amplitude
With phase, current signal Ib1Amplitude and phase, current signal Ic1Amplitude and phase.
Step S130：Utilize the electric current of the current transformer detection three-phase output bridge arm injection power network set in three-phase APF
Signal I2, extraction current signal I2Each phase amplitude and phase.
Specifically, detect the current signal I on output bridge arm 24 using current transformer 232, to current signal I2Adopted
Sample calculates, and records I respectivelya2、Ib2And Ic2Amplitude and phase.
Step S140：Judge current signal I1With current signal I2Current signal parameter it is whether consistent, wherein, electric current letter
Number parameter includes the amplitude and phase that separate, the corresponding separate upper electric current of electric current be present.
Specifically, current signal Ia1 amplitude and phase, current signal I is obtained according to step S120b1Amplitude and phase
Position, current signal Ic1Amplitude and phase；Current signal I is obtained according to step S130a2Amplitude and phase, electric current letter Ib2's
Amplitude and phase, current signal Ic2Amplitude and phase.Judge current signal I using three APF20 controller 211In the presence of electricity
Stream it is separate (i.e. amplitude be 0 it is separate) whether be A phases and C phases, judge current signal I2Have whether the separate of electric current is A
Mutually with C phases, current signal I is judgeda1Amplitude, phase and current signal Ia2Whether corresponding amplitude, phase are consistent, judge electricity
Flow signal Ib1Amplitude, phase and current signal Ib2Whether consistent (the I of corresponding amplitude, phaseb1With Ib2Amplitude whether be equal
For 0, current signal I is judgedc1Amplitude, phase and current signal Ic2Whether corresponding amplitude, phase are consistent.
Step S150：If current signal I1With current signal I2Current signal parameter it is consistent, then judge in three-phase APF
The current signal I of predeterminated frequency is injected to power network respectively21With current signal I22Two-phase output bridge arm and primary current transformer
Wiring is correct.
Specifically, because primary current transformer 30 and three-phase APF20 wiring there may be mistake, therefore detect
Current signal I1With current signal I2Current signal parameter there may be a variety of situations.Referring to Fig. 3-a, provided for the application
Three-phase APF and the correct current diagram of primary current mutual inductor interstar connection, as shown in Fig. 3-a, if Ib1And Ib2Amplitude be all
0, Ia1And Ia2Corresponding amplitude and phase are all identical, Ic1And Ic2Corresponding amplitude and phase are all identical, and Ia1 and Ic1Phase
On the contrary, then can determine that three-phase APF20 and primary current transformer 30 A phases secondary winding, C phase secondary winding wiring are correct,
That is the A+ input terminated lines of the A phases positive polarity output terminal of primary current transformer 30 and three-phase APF20 are correct, A phase negative polarity is defeated
The A- for going out end and three-phase APF20 is inputting correct terminated line, B phases positive polarity output terminal and three-phase APF20 B+ inputs terminated line just
Really, B phases negative polarity output and three-phase APF20 B- input correct terminated line, C phases positive polarity output terminal and three-phase APF20 C
+ input terminated line is correctly and C phases negative polarity output and three-phase APF20 C- input terminated lines are correct.
Further, if it is judged that as shown in Fig. 3-b, Ia1 and Ic1、Ic2Phase it is identical, then judge three-phase
APF20 and the positive-negative polarity of the A phase secondary windings of primary current transformer 30 are reversed, i.e., the A phases of primary current transformer 30 are being just
Polarity output terminal is connected with three-phase APF20 A- inputs, A phases negative polarity output is connected with three-phase APF20 A+ inputs.
If it is judged that as shown in Fig. 3-c, Ia1And Ic1、Ia2Phase it is identical, then judge primary current transformer 30
The positive-negative polarity of C phase secondary windings is reversed, i.e. the C- of the C phases positive polarity output terminal of primary current transformer 30 and three-phase APF20
Input connection, C phases negative polarity output are connected with three-phase APF20 C+ inputs.
If it is judged that as shown in Fig. 3-d, Ia1 and Ic2Phase is identical, and Ic1And Ia2Phase it is identical, then judge one
The A phases of primary current transformer 30, the positive-negative polarity of C phase secondary windings are reversed, i.e. the A phase positive polaritys of primary current transformer 30 are defeated
Go out end be connected with three-phase APF20 A- inputs, A phases negative polarity output is connected with three-phase APF20 A+ inputs, once electricity
The C phases positive polarity output terminal of current transformer 30 is connected with three-phase APF20 C- inputs, C phases negative polarity output and three-phase
APF20 C+ inputs connection；Or A phases and C phase secondary windings it is reversed, i.e. the A phase positive polaritys of primary current transformer 30 are defeated
Go out end be connected with three-phase APF20 C+ inputs, A phases negative polarity output is connected with three-phase APF20 C- inputs, once electricity
The C phases positive polarity output terminal of current transformer 30 is connected with three-phase APF20 A+ inputs, C phases negative polarity output and three-phase
APF20 A- inputs connection.
If it is judged that as shown in Fig. 3-e, Ia1 amplitudes are 0, and Ib1And Ia2Phase is identical, then judges that primary current is mutual
The A phases of sensor 30, the line of B phase secondary windings are reversed, i.e. the A phases positive polarity output terminal and three-phase of primary current transformer 30
APF20 B+ inputs connection, A phases negative polarity output are connected with three-phase APF20 B- inputs, primary current transformer 30
B phases positive polarity output terminal be connected with three-phase APF20 A+ inputs, B phases negative polarity output and three-phase APF20 A- are inputted
End connection.
If it is judged that as shown in Fig. 3-f, Ic1Amplitude is 0, and Ib1And Ic2Phase is identical, then judges it is primary current
The B phases of transformer 30, the line of C phase secondary windings are mutually reversed, i.e. the C phases positive polarity output terminal and three of primary current transformer 30
Phase APF20 B+ inputs connection, C phases negative polarity output are connected with three-phase APF20 B- inputs, primary current transformer
30 B phases positive polarity output terminal is connected with three-phase APF20 C+ inputs, B phases negative polarity output and three-phase APF20 C- are defeated
Enter end connection.
If it is judged that as shown in Fig. 3-g or 3-h, Ia1 and Ia2Phase is identical, Ia2And Ic2Phase is identical, but amplitude
Difference, then judgement is that the no-load voltage ratio parameter setting of primary current transformer 30 mistake occurs.
Further, when verifying next time, shut-off A phases is replaced with step S110 and export bridge arm, are exported using B phases
Bridge arm exports bridge arm to power network Injection Current with C phases, and is accordingly replaced in step S120-S140, then in step S150,
If Ia1And Ia2Amplitude all be 0, Ib1And Ib2Corresponding amplitude and phase are all identical, Ic1And Ic2Corresponding amplitude and phase are all
It is identical, and Ib1And Ic1Opposite in phase, then can determine that three-phase APF20 and primary current transformer 30 B phases secondary winding, C phases
Secondary winding wiring is correct.Therefore, judge that three-phase APF and primary current the transformer equal wiring of three-phase secondary winding are correct,
Need to carry out at least 2 times verifications.
It should be noted that result of determination of the application Fig. 3-a to Fig. 3-h, suitable for three-phase APF under normal circumstances with
The judgement of primary current mutual inductor interstar connection, may be due to three-phase APF internal faults or primary current mulual inductor malfunction in actual implementation
Etc. reason, cause to judge invalid, be not belonging to the application to three-phase APF and this judgement model of primary current mutual inductor interstar connection
Enclose, the decision method mistake of the application offer is provided.In addition, in addition to the current diagram that Fig. 3-a provide to Fig. 3-h,
Current signal I1With current signal I2Current signal parameter be also possible that other situations, wiring error, this implementation should be judged as
Example will not enumerate.
As seen from the above-described embodiment, the application provides on-line testing three-phase APF and primary current mutual inductor interstar connection side
Method, a bridge arm wherein phase bridge arm is exported by the three-phase that three-phase APF is connected with power network and turned off, in addition two-phase output bridge arm difference
It is that predeterminated frequency, amplitude be identical, current signal of opposite in phase to power network injected frequency, using primary current transformer from power network
The current signal I that frequency is predeterminated frequency is extracted in low current signal1, detected using the current transformer set in three-phase APF
Inject the current signal I of power network2, according to current signal I1With current signal I2Separate, the corresponding separate upper electric current of electric current be present
Amplitude and phase unanimously judge that three-phase APF and primary current mutual inductor interstar connection are correct, due to current signal and the electricity of injection
Net power frequency component frequency is different, therefore can not be powered off in power network bus, verify three under conditions of primary current transformer does not power off
Phase APF and primary current mutual inductor interstar connection, the efficiency of verification wiring is improved, be advantageous to power system stability operation；Pass through tune
The shut-off and connection of whole three-phase output bridge arm, can be continuously finished three-phase APF and the phase connection of primary current transformer three verification, even
In continuous checking procedure, the shut-off of adjustment three-phase output bridge arm need not change three-phase APF and primary current with connecting without having a power failure
The order of connection of transformer, further improve the efficiency of verification wiring；Inject the two-phase predeterminated frequency current signal of power network
I21With current signal I22Amplitude is identical and opposite in phase, according to circuit theory, should exist if wiring is correct, in power network pre-
If the amplitude of frequency is identical and the biphase current of opposite in phase, the electric current of the predeterminated frequency is not present in another phase, avoids same
When that may be present be difficult to differentiate with the presence or absence of wrong is separate, no-load voltage ratio is set when applying three-phase predeterminated frequency current signal to power network
Mistake and the situation for causing signal attenuation because wiring is insecure；Utilize the current transformer and controller set in three-phase APF
Extract predeterminated frequency current signal, it is not necessary to extra wiring calibration equipment and signal filtering algorithm are utilized, therefore need not be
Increase and decrease circuit in power network, be advantageous to the stable operation of power network.
It is required that those skilled in the art can be understood that the technology in the embodiment of the present invention can add by software
The mode of general hardware platform realize.Based on such understanding, the technical scheme in the embodiment of the present invention substantially or
Say that the part to be contributed to prior art can be embodied in the form of software product, the computer software product can be deposited
Storage is in storage medium, such as ROM/RAM, magnetic disc, CD, including some instructions are causing a computer equipment (can be with
Be personal computer, server, either network equipment etc.) perform some part institutes of each embodiment of the present invention or embodiment
The method stated.
Invention described above embodiment is not intended to limit the scope of the present invention..
Claims (7)
- A kind of 1. on-line testing three-phase APF and primary current mutual inductor interstar connection method, it is characterised in that including：The three-phase that three-phase APF is connected with power network exports the phase output bridge arm shut-off in bridge arm, in addition two-phase output bridge arm point The current signal I of predeterminated frequency is not injected to the power network21With current signal I22, wherein, the current signal I21Believe with electric current Number I22Amplitude is identical, opposite in phase, the predeterminated frequency is more than the integral multiple of network operation frequency or less than network operation frequency The integral multiple of rate；The power network low current signal of primary current transformer output is obtained, it is described to extract the power network low current signal intermediate frequency rate The current signal I of predeterminated frequency1Each phase amplitude and phase；The current signal I of the three-phase output bridge arm injection power network is detected using the current transformer set in the three-phase APF2, Extract the current signal I2Each phase amplitude and phase；Judge the current signal I1With the current signal I2Current signal parameter it is whether consistent, wherein, the current signal Parameter includes the amplitude and phase that separate, the corresponding separate upper electric current of electric current be present；If the current signal I1With the current signal I2Current signal parameter it is consistent, then judge in the three-phase APF point The current signal I of predeterminated frequency is not injected to the power network21With current signal I22Two-phase output bridge arm and primary current mutual inductance Device wiring is correct.
- 2. on-line testing three-phase APF according to claim 1 and primary current mutual inductor interstar connection method, its feature exist In methods described also includes：If the current signal I1A phase currents phase and C phase currents phase, the current signal I2C phase currents phase It is consistent, then judge the A phases of the primary current transformer and the A phase connection reverse polarity connections of the three-phase APF.
- 3. on-line testing three-phase APF according to claim 1 and primary current mutual inductor interstar connection method, its feature exist In methods described also includes：If the current signal I1A phase current magnitudes for 0, the phase of B phase currents and the current signal I2A phase currents Phase is identical, then judges the separate reversed of the A phases of the primary current transformer, B phases phase connection corresponding with the three-phase APF.
- 4. on-line testing three-phase APF according to claim 1 and primary current mutual inductor interstar connection method, its feature exist In methods described also includes：If the current signal I1Wherein biphase current respectively with the current signal I2Corresponding biphase current phase is identical, Amplitude is different, then judges the no-load voltage ratio parameter setting mistake of the primary current transformer.
- 5. on-line testing three-phase APF according to claim 1 and primary current mutual inductor interstar connection method, its feature exist In, extract the power network low current signal intermediate frequency rate be the predeterminated frequency current signal I1Each phase amplitude and phase, including：The power network low current signal is sampled；Discrete Fourier transform is carried out to the signal after sampling, it is described that frequency is extracted from the signal after discrete Fourier transform The current signal I of predeterminated frequency1Each phase amplitude and phase.
- 6. on-line testing three-phase APF according to claim 1 and primary current mutual inductor interstar connection method, its feature exist In the predeterminated frequency includes 75Hz-175Hz.
- 7. on-line testing three-phase APF according to claim 1 and primary current mutual inductor interstar connection method, its feature exist In the three-phase APF includes Three-Phase Shunt Active Power electric-power filter.
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